From 97a9da40301e308729569258e8260ac876804f4f Mon Sep 17 00:00:00 2001
From: 0xFEEDC0DE64 <daniel@brunner.ninja>
Date: Sun, 14 Jan 2024 15:31:47 +0100
Subject: [PATCH] Implemented object selection widgets in action dialogs

---
 QtGameMaker.pro                               |  10 +-
 .../dialogs/actions/executecodedialog.cpp     |  39 ++-
 .../dialogs/actions/executecodedialog.h       |   6 +-
 .../dialogs/actions/movefixeddialog.cpp       |  12 +-
 src/editor/dialogs/actions/movefixeddialog.h  |   3 +-
 src/editor/dialogs/actions/movefixeddialog.ui |  35 ++-
 src/editor/dialogs/actions/movefreedialog.cpp |  12 +-
 src/editor/dialogs/actions/movefreedialog.h   |   3 +-
 src/editor/dialogs/actions/movefreedialog.ui  |  35 ++-
 .../dialogs/actions/movetowardsdialog.cpp     |  12 +-
 .../dialogs/actions/movetowardsdialog.h       |   3 +-
 .../dialogs/actions/movetowardsdialog.ui      |  35 ++-
 .../dialogs/actions/setgravitydialog.cpp      |  29 ++
 src/editor/dialogs/actions/setgravitydialog.h |  23 ++
 .../dialogs/actions/setgravitydialog.ui       | 249 ++++++++++++++++++
 .../dialogs/actions/speedhorizontaldialog.cpp |  12 +-
 .../dialogs/actions/speedhorizontaldialog.h   |   3 +-
 .../dialogs/actions/speedhorizontaldialog.ui  | 216 +++++++++++++--
 .../dialogs/actions/speedverticaldialog.cpp   |  12 +-
 .../dialogs/actions/speedverticaldialog.h     |   3 +-
 .../dialogs/actions/speedverticaldialog.ui    | 216 +++++++++++++--
 src/editor/dialogs/codeeditordialog.cpp       |   4 +-
 src/editor/dialogs/codeeditordialog.h         |   2 +-
 src/editor/dialogs/objectpropertiesdialog.cpp |  80 ++----
 src/editor/dialogs/objectpropertiesdialog.h   |   6 -
 src/editor/dialogs/objectpropertiesdialog.ui  |  40 +--
 src/editor/icons/action-set-gravity.png       | Bin 0 -> 13447 bytes
 src/editor/models/actionscontainermodel.cpp   |   4 +
 src/editor/models/actionscontainermodel.h     |   3 +-
 src/editor/resources_editor.qrc               |   1 +
 src/editor/widgets/actionscontainerwidget.cpp |  32 ++-
 src/editor/widgets/actionscontainerwidget.h   |  10 +-
 src/editor/widgets/actionscontainerwidget.ui  |   4 +-
 .../widgets/objectparentselectorwidget.cpp    |  14 +
 .../widgets/objectparentselectorwidget.h      |  19 ++
 src/editor/widgets/objectselectorwidget.cpp   |  83 ++++++
 src/editor/widgets/objectselectorwidget.h     |  51 ++++
 src/editor/widgets/objectselectorwidget.ui    |  59 +++++
 src/projectcontainer.h                        |  39 ++-
 src/projectserialization.cpp                  |  84 +++++-
 src/projectserialization.h                    |   8 +
 41 files changed, 1283 insertions(+), 228 deletions(-)
 create mode 100644 src/editor/dialogs/actions/setgravitydialog.cpp
 create mode 100644 src/editor/dialogs/actions/setgravitydialog.h
 create mode 100644 src/editor/dialogs/actions/setgravitydialog.ui
 create mode 100644 src/editor/icons/action-set-gravity.png
 create mode 100644 src/editor/widgets/objectparentselectorwidget.cpp
 create mode 100644 src/editor/widgets/objectparentselectorwidget.h
 create mode 100644 src/editor/widgets/objectselectorwidget.cpp
 create mode 100644 src/editor/widgets/objectselectorwidget.h
 create mode 100644 src/editor/widgets/objectselectorwidget.ui

diff --git a/QtGameMaker.pro b/QtGameMaker.pro
index 018f224..9090134 100644
--- a/QtGameMaker.pro
+++ b/QtGameMaker.pro
@@ -26,6 +26,7 @@ INCLUDEPATH += \
 
 HEADERS += \
     src/closeeventfilter.h \
+    src/editor/dialogs/actions/setgravitydialog.h \
     src/editor/dialogs/actions/speedhorizontaldialog.h \
     src/editor/dialogs/actions/movefreedialog.h \
     src/editor/dialogs/actions/movetowardsdialog.h \
@@ -38,6 +39,8 @@ HEADERS += \
     src/editor/roomscene.h \
     src/editor/widgets/actiondragwidget.h \
     src/editor/widgets/draggabletreeview.h \
+    src/editor/widgets/objectparentselectorwidget.h \
+    src/editor/widgets/objectselectorwidget.h \
     src/editor/widgets/qlineeditwithmenu.h \
     src/editor/widgets/qscrollareawithmenu.h \
     src/editor/widgets/roomeditwidget.h \
@@ -94,6 +97,7 @@ HEADERS += \
 SOURCES += \
     src/closeeventfilter.cpp \
     src/editor/dialogs/actions/executecodedialog.cpp \
+    src/editor/dialogs/actions/setgravitydialog.cpp \
     src/editor/dialogs/actions/speedhorizontaldialog.cpp \
     src/editor/dialogs/actions/movefreedialog.cpp \
     src/editor/dialogs/actions/movetowardsdialog.cpp \
@@ -105,6 +109,8 @@ SOURCES += \
     src/editor/roomscene.cpp \
     src/editor/widgets/actiondragwidget.cpp \
     src/editor/widgets/draggabletreeview.cpp \
+    src/editor/widgets/objectparentselectorwidget.cpp \
+    src/editor/widgets/objectselectorwidget.cpp \
     src/editor/widgets/qlineeditwithmenu.cpp \
     src/editor/widgets/qscrollareawithmenu.cpp \
     src/editor/widgets/roomeditwidget.cpp \
@@ -158,6 +164,7 @@ SOURCES += \
     src/projectserialization.cpp
 
 FORMS += \
+    src/editor/dialogs/actions/setgravitydialog.ui \
     src/editor/dialogs/actions/speedhorizontaldialog.ui \
     src/editor/dialogs/actions/movefreedialog.ui \
     src/editor/dialogs/actions/movetowardsdialog.ui \
@@ -190,7 +197,8 @@ FORMS += \
     src/editor/dialogs/triggersdialog.ui \
     src/editor/dialogs/userdefinedconstantsdialog.ui \
     src/editor/widgets/actionscontainerwidget.ui\
-    src/editor/dialogs/actions/movefixeddialog.ui
+    src/editor/dialogs/actions/movefixeddialog.ui \
+    src/editor/widgets/objectselectorwidget.ui
 
 RESOURCES += \
     src/editor/resources_editor.qrc \
diff --git a/src/editor/dialogs/actions/executecodedialog.cpp b/src/editor/dialogs/actions/executecodedialog.cpp
index 1666e72..47153ba 100644
--- a/src/editor/dialogs/actions/executecodedialog.cpp
+++ b/src/editor/dialogs/actions/executecodedialog.cpp
@@ -1,31 +1,54 @@
 #include "executecodedialog.h"
 
 #include <QRadioButton>
+#include <QLineEdit>
 #include <QLabel>
 #include <QMessageBox>
 
 #include "projectcontainer.h"
+#include "widgets/objectselectorwidget.h"
 
-ExecuteCodeDialog::ExecuteCodeDialog(ExecuteCodeAction &action, QWidget *parent) :
+ExecuteCodeDialog::ExecuteCodeDialog(ExecuteCodeAction &action, ProjectTreeModel *projectModel, QWidget *parent) :
     CodeEditorDialog{tr("Execute Code"), parent},
     m_action{action},
     m_radioButtonSelf{new QRadioButton{tr("Self"), this}},
     m_radioButtonOther{new QRadioButton{tr("Other"), this}},
-    m_radioButtonObject{new QRadioButton{tr("Object"), this}}
+    m_radioButtonObject{new QRadioButton{tr("Object"), this}},
+    m_objectSelector{new ObjectSelectorWidget{this}}
 {
 #ifdef Q_OS_LINUX
     setWindowFlags((windowFlags() & ~Qt::Dialog) | Qt::Window);
 #endif
     setWindowFlag(Qt::WindowCloseButtonHint);
 
+    m_objectSelector->setProjectModel(projectModel);
+
+    m_objectSelector->setEmptySelectionText(tr("self"));
+    m_objectSelector->setShowClearObjectAction(false);
+
     addToolbarWidget(new QLabel{tr("Applies to:"), this});
     addToolbarWidget(m_radioButtonSelf);
     addToolbarWidget(m_radioButtonOther);
     addToolbarWidget(m_radioButtonObject);
+    auto action_ = addToolbarWidget(m_objectSelector);
 
-    m_radioButtonSelf->setChecked(m_action.appliesTo == ExecuteCodeAction::AppliesTo::Self);
-    m_radioButtonOther->setChecked(m_action.appliesTo == ExecuteCodeAction::AppliesTo::Other);
-    m_radioButtonObject->setChecked(m_action.appliesTo == ExecuteCodeAction::AppliesTo::Object);
+    connect(m_radioButtonObject, &QRadioButton::toggled,
+            m_objectSelector, &QWidget::setVisible);
+    connect(m_radioButtonObject, &QRadioButton::toggled,
+            action_, &QAction::setVisible);
+
+    m_radioButtonSelf->setChecked(std::holds_alternative<AppliesToSelf>(m_action.appliesTo));
+    m_radioButtonOther->setChecked(std::holds_alternative<AppliesToOther>(m_action.appliesTo));
+    {
+        auto ptr = std::get_if<AppliesToObject>(&m_action.appliesTo);
+        m_radioButtonObject->setChecked(ptr != nullptr);
+        m_objectSelector->setVisible(ptr != nullptr);
+        action_->setVisible(ptr != nullptr);
+        if (ptr)
+            m_objectSelector->setObject(ptr->objectName);
+        else
+            m_objectSelector->clearObject();
+    }
 
     setScript(m_action.script);
 
@@ -46,11 +69,11 @@ void ExecuteCodeDialog::accept()
     }
 
     if (m_radioButtonSelf->isChecked())
-        m_action.appliesTo = ExecuteCodeAction::AppliesTo::Self;
+        m_action.appliesTo = AppliesToSelf{};
     else if (m_radioButtonOther->isChecked())
-        m_action.appliesTo = ExecuteCodeAction::AppliesTo::Other;
+        m_action.appliesTo = AppliesToOther{};
     else if (m_radioButtonObject->isChecked())
-        m_action.appliesTo = ExecuteCodeAction::AppliesTo::Object;
+        m_action.appliesTo = AppliesToObject{ .objectName = m_objectSelector->objectName() };
     else
     {
         QMessageBox::warning(this, tr("No Applies To selected!"), tr("No Applies To selected!"));
diff --git a/src/editor/dialogs/actions/executecodedialog.h b/src/editor/dialogs/actions/executecodedialog.h
index 61b817c..314a234 100644
--- a/src/editor/dialogs/actions/executecodedialog.h
+++ b/src/editor/dialogs/actions/executecodedialog.h
@@ -4,13 +4,15 @@
 
 class QRadioButton;
 struct ExecuteCodeAction;
+class ProjectTreeModel;
+class ObjectSelectorWidget;
 
 class ExecuteCodeDialog : public CodeEditorDialog
 {
     Q_OBJECT
 
 public:
-    explicit ExecuteCodeDialog(ExecuteCodeAction &action, QWidget *parent = nullptr);
+    explicit ExecuteCodeDialog(ExecuteCodeAction &action, ProjectTreeModel *projectModel, QWidget *parent = nullptr);
 
     void accept() override;
 
@@ -20,4 +22,6 @@ private:
     QRadioButton * const m_radioButtonSelf;
     QRadioButton * const m_radioButtonOther;
     QRadioButton * const m_radioButtonObject;
+
+    ObjectSelectorWidget * const m_objectSelector;
 };
diff --git a/src/editor/dialogs/actions/movefixeddialog.cpp b/src/editor/dialogs/actions/movefixeddialog.cpp
index 49c6e1e..6fb1c28 100644
--- a/src/editor/dialogs/actions/movefixeddialog.cpp
+++ b/src/editor/dialogs/actions/movefixeddialog.cpp
@@ -3,13 +3,23 @@
 
 #include <QPushButton>
 
-MoveFixedDialog::MoveFixedDialog(MoveFixedAction &action, QWidget *parent) :
+MoveFixedDialog::MoveFixedDialog(MoveFixedAction &action, ProjectTreeModel *projectModel, QWidget *parent) :
     QDialog{parent},
     m_ui{std::make_unique<Ui::MoveFixedDialog>()},
     m_action{action}
 {
     m_ui->setupUi(this);
 
+    {
+        QSizePolicy sp_retain = m_ui->widgetObject->sizePolicy();
+        sp_retain.setRetainSizeWhenHidden(true);
+        m_ui->widgetObject->setSizePolicy(sp_retain);
+    }
+    m_ui->widgetObject->setProjectModel(projectModel);
+
+    m_ui->widgetObject->setEmptySelectionText(tr("self"));
+    m_ui->widgetObject->setShowClearObjectAction(false);
+
     if (auto button = m_ui->buttonBox->button(QDialogButtonBox::Ok))
         button->setIcon(QIcon{":/qtgameengine/icons/ok.png"});
     if (auto button = m_ui->buttonBox->button(QDialogButtonBox::Cancel))
diff --git a/src/editor/dialogs/actions/movefixeddialog.h b/src/editor/dialogs/actions/movefixeddialog.h
index 363c7a1..ddb55da 100644
--- a/src/editor/dialogs/actions/movefixeddialog.h
+++ b/src/editor/dialogs/actions/movefixeddialog.h
@@ -6,13 +6,14 @@
 
 namespace Ui { class MoveFixedDialog; }
 class MoveFixedAction;
+class ProjectTreeModel;
 
 class MoveFixedDialog : public QDialog
 {
     Q_OBJECT
 
 public:
-    explicit MoveFixedDialog(MoveFixedAction &action, QWidget *parent = nullptr);
+    explicit MoveFixedDialog(MoveFixedAction &action, ProjectTreeModel *projectModel, QWidget *parent = nullptr);
     ~MoveFixedDialog() override;
 
 private:
diff --git a/src/editor/dialogs/actions/movefixeddialog.ui b/src/editor/dialogs/actions/movefixeddialog.ui
index d3de655..a0e4a2a 100644
--- a/src/editor/dialogs/actions/movefixeddialog.ui
+++ b/src/editor/dialogs/actions/movefixeddialog.ui
@@ -50,7 +50,7 @@
          </widget>
         </item>
         <item>
-         <layout class="QHBoxLayout" name="horizontalLayout_2">
+         <layout class="QHBoxLayout" name="horizontalLayout_2" stretch="0,1">
           <item>
            <widget class="QRadioButton" name="radioButtonObject">
             <property name="text">
@@ -59,12 +59,9 @@
            </widget>
           </item>
           <item>
-           <widget class="QLineEdit" name="lineEdit"/>
-          </item>
-          <item>
-           <widget class="QToolButton" name="toolButton">
-            <property name="text">
-             <string>...</string>
+           <widget class="ObjectSelectorWidget" name="widgetObject" native="true">
+            <property name="visible">
+             <bool>false</bool>
             </property>
            </widget>
           </item>
@@ -285,6 +282,14 @@
    </item>
   </layout>
  </widget>
+ <customwidgets>
+  <customwidget>
+   <class>ObjectSelectorWidget</class>
+   <extends>QWidget</extends>
+   <header>widgets/objectselectorwidget.h</header>
+   <container>1</container>
+  </customwidget>
+ </customwidgets>
  <resources>
   <include location="../../resources_editor.qrc"/>
  </resources>
@@ -321,5 +326,21 @@
     </hint>
    </hints>
   </connection>
+  <connection>
+   <sender>radioButtonObject</sender>
+   <signal>toggled(bool)</signal>
+   <receiver>widgetObject</receiver>
+   <slot>setVisible(bool)</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>127</x>
+     <y>115</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>289</x>
+     <y>115</y>
+    </hint>
+   </hints>
+  </connection>
  </connections>
 </ui>
diff --git a/src/editor/dialogs/actions/movefreedialog.cpp b/src/editor/dialogs/actions/movefreedialog.cpp
index 1e252ff..cd53844 100644
--- a/src/editor/dialogs/actions/movefreedialog.cpp
+++ b/src/editor/dialogs/actions/movefreedialog.cpp
@@ -3,13 +3,23 @@
 
 #include <QPushButton>
 
-MoveFreeDialog::MoveFreeDialog(MoveFreeAction &action, QWidget *parent) :
+MoveFreeDialog::MoveFreeDialog(MoveFreeAction &action, ProjectTreeModel *projectModel, QWidget *parent) :
     QDialog{parent},
     m_ui{std::make_unique<Ui::MoveFreeDialog>()},
     m_action{action}
 {
     m_ui->setupUi(this);
 
+    {
+        QSizePolicy sp_retain = m_ui->widgetObject->sizePolicy();
+        sp_retain.setRetainSizeWhenHidden(true);
+        m_ui->widgetObject->setSizePolicy(sp_retain);
+    }
+    m_ui->widgetObject->setProjectModel(projectModel);
+
+    m_ui->widgetObject->setEmptySelectionText(tr("self"));
+    m_ui->widgetObject->setShowClearObjectAction(false);
+
     if (auto button = m_ui->buttonBox->button(QDialogButtonBox::Ok))
         button->setIcon(QIcon{":/qtgameengine/icons/ok.png"});
     if (auto button = m_ui->buttonBox->button(QDialogButtonBox::Cancel))
diff --git a/src/editor/dialogs/actions/movefreedialog.h b/src/editor/dialogs/actions/movefreedialog.h
index 260b9d6..cc4031b 100644
--- a/src/editor/dialogs/actions/movefreedialog.h
+++ b/src/editor/dialogs/actions/movefreedialog.h
@@ -6,13 +6,14 @@
 
 namespace Ui { class MoveFreeDialog; }
 class MoveFreeAction;
+class ProjectTreeModel;
 
 class MoveFreeDialog : public QDialog
 {
     Q_OBJECT
 
 public:
-    explicit MoveFreeDialog(MoveFreeAction &action, QWidget *parent = nullptr);
+    explicit MoveFreeDialog(MoveFreeAction &action, ProjectTreeModel *projectModel, QWidget *parent = nullptr);
     ~MoveFreeDialog() override;
 
 private:
diff --git a/src/editor/dialogs/actions/movefreedialog.ui b/src/editor/dialogs/actions/movefreedialog.ui
index e8c9148..506834a 100644
--- a/src/editor/dialogs/actions/movefreedialog.ui
+++ b/src/editor/dialogs/actions/movefreedialog.ui
@@ -50,7 +50,7 @@
          </widget>
         </item>
         <item>
-         <layout class="QHBoxLayout" name="horizontalLayout_2">
+         <layout class="QHBoxLayout" name="horizontalLayout_2" stretch="0,1">
           <item>
            <widget class="QRadioButton" name="radioButtonObject">
             <property name="text">
@@ -59,12 +59,9 @@
            </widget>
           </item>
           <item>
-           <widget class="QLineEdit" name="lineEdit"/>
-          </item>
-          <item>
-           <widget class="QToolButton" name="toolButton">
-            <property name="text">
-             <string>...</string>
+           <widget class="ObjectSelectorWidget" name="widgetObject" native="true">
+            <property name="visible">
+             <bool>false</bool>
             </property>
            </widget>
           </item>
@@ -188,6 +185,14 @@
    </item>
   </layout>
  </widget>
+ <customwidgets>
+  <customwidget>
+   <class>ObjectSelectorWidget</class>
+   <extends>QWidget</extends>
+   <header>widgets/objectselectorwidget.h</header>
+   <container>1</container>
+  </customwidget>
+ </customwidgets>
  <resources>
   <include location="../../resources_editor.qrc"/>
  </resources>
@@ -224,5 +229,21 @@
     </hint>
    </hints>
   </connection>
+  <connection>
+   <sender>radioButtonObject</sender>
+   <signal>toggled(bool)</signal>
+   <receiver>widgetObject</receiver>
+   <slot>setVisible(bool)</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>127</x>
+     <y>115</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>289</x>
+     <y>115</y>
+    </hint>
+   </hints>
+  </connection>
  </connections>
 </ui>
diff --git a/src/editor/dialogs/actions/movetowardsdialog.cpp b/src/editor/dialogs/actions/movetowardsdialog.cpp
index af28db8..de48d0a 100644
--- a/src/editor/dialogs/actions/movetowardsdialog.cpp
+++ b/src/editor/dialogs/actions/movetowardsdialog.cpp
@@ -3,13 +3,23 @@
 
 #include <QPushButton>
 
-MoveTowardsDialog::MoveTowardsDialog(MoveTowardsAction &action, QWidget *parent) :
+MoveTowardsDialog::MoveTowardsDialog(MoveTowardsAction &action, ProjectTreeModel *projectModel, QWidget *parent) :
     QDialog{parent},
     m_ui{std::make_unique<Ui::MoveTowardsDialog>()},
     m_action{action}
 {
     m_ui->setupUi(this);
 
+    {
+        QSizePolicy sp_retain = m_ui->widgetObject->sizePolicy();
+        sp_retain.setRetainSizeWhenHidden(true);
+        m_ui->widgetObject->setSizePolicy(sp_retain);
+    }
+    m_ui->widgetObject->setProjectModel(projectModel);
+
+    m_ui->widgetObject->setEmptySelectionText(tr("self"));
+    m_ui->widgetObject->setShowClearObjectAction(false);
+
     if (auto button = m_ui->buttonBox->button(QDialogButtonBox::Ok))
         button->setIcon(QIcon{":/qtgameengine/icons/ok.png"});
     if (auto button = m_ui->buttonBox->button(QDialogButtonBox::Cancel))
diff --git a/src/editor/dialogs/actions/movetowardsdialog.h b/src/editor/dialogs/actions/movetowardsdialog.h
index c107b2e..c9f498f 100644
--- a/src/editor/dialogs/actions/movetowardsdialog.h
+++ b/src/editor/dialogs/actions/movetowardsdialog.h
@@ -6,13 +6,14 @@
 
 namespace Ui { class MoveTowardsDialog; }
 class MoveTowardsAction;
+class ProjectTreeModel;
 
 class MoveTowardsDialog : public QDialog
 {
     Q_OBJECT
 
 public:
-    explicit MoveTowardsDialog(MoveTowardsAction &action, QWidget *parent = nullptr);
+    explicit MoveTowardsDialog(MoveTowardsAction &action, ProjectTreeModel *projectModel, QWidget *parent = nullptr);
     ~MoveTowardsDialog() override;
 
 private:
diff --git a/src/editor/dialogs/actions/movetowardsdialog.ui b/src/editor/dialogs/actions/movetowardsdialog.ui
index 8104348..b85855d 100644
--- a/src/editor/dialogs/actions/movetowardsdialog.ui
+++ b/src/editor/dialogs/actions/movetowardsdialog.ui
@@ -50,7 +50,7 @@
          </widget>
         </item>
         <item>
-         <layout class="QHBoxLayout" name="horizontalLayout_2">
+         <layout class="QHBoxLayout" name="horizontalLayout_2" stretch="0,1">
           <item>
            <widget class="QRadioButton" name="radioButtonObject">
             <property name="text">
@@ -59,12 +59,9 @@
            </widget>
           </item>
           <item>
-           <widget class="QLineEdit" name="lineEdit"/>
-          </item>
-          <item>
-           <widget class="QToolButton" name="toolButton">
-            <property name="text">
-             <string>...</string>
+           <widget class="ObjectSelectorWidget" name="widgetObject" native="true">
+            <property name="visible">
+             <bool>false</bool>
             </property>
            </widget>
           </item>
@@ -201,6 +198,14 @@
    </item>
   </layout>
  </widget>
+ <customwidgets>
+  <customwidget>
+   <class>ObjectSelectorWidget</class>
+   <extends>QWidget</extends>
+   <header>widgets/objectselectorwidget.h</header>
+   <container>1</container>
+  </customwidget>
+ </customwidgets>
  <resources>
   <include location="../../resources_editor.qrc"/>
  </resources>
@@ -237,5 +242,21 @@
     </hint>
    </hints>
   </connection>
+  <connection>
+   <sender>radioButtonObject</sender>
+   <signal>toggled(bool)</signal>
+   <receiver>widgetObject</receiver>
+   <slot>setVisible(bool)</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>127</x>
+     <y>115</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>289</x>
+     <y>115</y>
+    </hint>
+   </hints>
+  </connection>
  </connections>
 </ui>
diff --git a/src/editor/dialogs/actions/setgravitydialog.cpp b/src/editor/dialogs/actions/setgravitydialog.cpp
new file mode 100644
index 0000000..a228b2a
--- /dev/null
+++ b/src/editor/dialogs/actions/setgravitydialog.cpp
@@ -0,0 +1,29 @@
+#include "setgravitydialog.h"
+#include "ui_setgravitydialog.h"
+
+#include <QPushButton>
+
+SetGravityDialog::SetGravityDialog(SetGravityAction &action, ProjectTreeModel *projectModel, QWidget *parent) :
+    QDialog{parent},
+    m_ui{std::make_unique<Ui::SetGravityDialog>()},
+    m_action{action}
+{
+    m_ui->setupUi(this);
+
+    {
+        QSizePolicy sp_retain = m_ui->widgetObject->sizePolicy();
+        sp_retain.setRetainSizeWhenHidden(true);
+        m_ui->widgetObject->setSizePolicy(sp_retain);
+    }
+    m_ui->widgetObject->setProjectModel(projectModel);
+
+    m_ui->widgetObject->setEmptySelectionText(tr("self"));
+    m_ui->widgetObject->setShowClearObjectAction(false);
+
+    if (auto button = m_ui->buttonBox->button(QDialogButtonBox::Ok))
+        button->setIcon(QIcon{":/qtgameengine/icons/ok.png"});
+    if (auto button = m_ui->buttonBox->button(QDialogButtonBox::Cancel))
+        button->setIcon(QIcon{":/qtgameengine/icons/delete.png"});
+}
+
+SetGravityDialog::~SetGravityDialog() = default;
diff --git a/src/editor/dialogs/actions/setgravitydialog.h b/src/editor/dialogs/actions/setgravitydialog.h
new file mode 100644
index 0000000..4f84e08
--- /dev/null
+++ b/src/editor/dialogs/actions/setgravitydialog.h
@@ -0,0 +1,23 @@
+#pragma once
+
+#include <QDialog>
+
+#include <memory>
+
+namespace Ui { class SetGravityDialog; }
+struct SetGravityAction;
+class ProjectTreeModel;
+
+class SetGravityDialog : public QDialog
+{
+    Q_OBJECT
+
+public:
+    explicit SetGravityDialog(SetGravityAction &action, ProjectTreeModel *projectModel, QWidget *parent = nullptr);
+    ~SetGravityDialog() override;
+
+private:
+    const std::unique_ptr<Ui::SetGravityDialog> m_ui;
+
+    SetGravityAction &m_action;
+};
diff --git a/src/editor/dialogs/actions/setgravitydialog.ui b/src/editor/dialogs/actions/setgravitydialog.ui
new file mode 100644
index 0000000..b368e84
--- /dev/null
+++ b/src/editor/dialogs/actions/setgravitydialog.ui
@@ -0,0 +1,249 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>SetGravityDialog</class>
+ <widget class="QDialog" name="SetGravityDialog">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>435</width>
+    <height>429</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Set Gravity</string>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout_2" stretch="0,1,0">
+   <item>
+    <layout class="QHBoxLayout" name="horizontalLayout" stretch="0,1">
+     <item>
+      <widget class="QLabel" name="label">
+       <property name="text">
+        <string/>
+       </property>
+       <property name="pixmap">
+        <pixmap resource="../../resources_editor.qrc">:/qtgameengine/icons/action-set-gravity.png</pixmap>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QGroupBox" name="groupBox">
+       <property name="title">
+        <string>Applies to</string>
+       </property>
+       <layout class="QVBoxLayout" name="verticalLayout">
+        <item>
+         <widget class="QRadioButton" name="radioButtonSelf">
+          <property name="text">
+           <string>Self</string>
+          </property>
+          <property name="checked">
+           <bool>true</bool>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="QRadioButton" name="radioButtonOther">
+          <property name="text">
+           <string>Other</string>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <layout class="QHBoxLayout" name="horizontalLayout_2" stretch="0,1">
+          <item>
+           <widget class="QRadioButton" name="radioButtonObject">
+            <property name="text">
+             <string>Object:</string>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="ObjectSelectorWidget" name="widgetObject" native="true">
+            <property name="visible">
+             <bool>false</bool>
+            </property>
+           </widget>
+          </item>
+         </layout>
+        </item>
+       </layout>
+      </widget>
+     </item>
+    </layout>
+   </item>
+   <item>
+    <widget class="QFrame" name="frame">
+     <property name="frameShape">
+      <enum>QFrame::StyledPanel</enum>
+     </property>
+     <property name="frameShadow">
+      <enum>QFrame::Raised</enum>
+     </property>
+     <layout class="QGridLayout" name="gridLayout_2">
+      <item row="1" column="2">
+       <spacer name="horizontalSpacer_2">
+        <property name="orientation">
+         <enum>Qt::Horizontal</enum>
+        </property>
+        <property name="sizeHint" stdset="0">
+         <size>
+          <width>40</width>
+          <height>20</height>
+         </size>
+        </property>
+       </spacer>
+      </item>
+      <item row="0" column="1">
+       <spacer name="verticalSpacer">
+        <property name="orientation">
+         <enum>Qt::Vertical</enum>
+        </property>
+        <property name="sizeHint" stdset="0">
+         <size>
+          <width>20</width>
+          <height>40</height>
+         </size>
+        </property>
+       </spacer>
+      </item>
+      <item row="2" column="1">
+       <spacer name="verticalSpacer_2">
+        <property name="orientation">
+         <enum>Qt::Vertical</enum>
+        </property>
+        <property name="sizeHint" stdset="0">
+         <size>
+          <width>20</width>
+          <height>40</height>
+         </size>
+        </property>
+       </spacer>
+      </item>
+      <item row="1" column="0">
+       <spacer name="horizontalSpacer">
+        <property name="orientation">
+         <enum>Qt::Horizontal</enum>
+        </property>
+        <property name="sizeHint" stdset="0">
+         <size>
+          <width>40</width>
+          <height>20</height>
+         </size>
+        </property>
+       </spacer>
+      </item>
+      <item row="1" column="1">
+       <layout class="QFormLayout" name="formLayout">
+        <item row="0" column="0">
+         <widget class="QLabel" name="labelDirection">
+          <property name="text">
+           <string>direction:</string>
+          </property>
+          <property name="buddy">
+           <cstring>spinBoxDirection</cstring>
+          </property>
+         </widget>
+        </item>
+        <item row="0" column="1">
+         <widget class="QSpinBox" name="spinBoxDirection"/>
+        </item>
+        <item row="1" column="0">
+         <widget class="QLabel" name="labelGravity">
+          <property name="text">
+           <string>gravity:</string>
+          </property>
+          <property name="buddy">
+           <cstring>spinBoxGravity</cstring>
+          </property>
+         </widget>
+        </item>
+        <item row="1" column="1">
+         <widget class="QSpinBox" name="spinBoxGravity"/>
+        </item>
+        <item row="2" column="1">
+         <widget class="QCheckBox" name="checkBoxRelative">
+          <property name="text">
+           <string>Relative</string>
+          </property>
+         </widget>
+        </item>
+       </layout>
+      </item>
+     </layout>
+    </widget>
+   </item>
+   <item>
+    <widget class="QDialogButtonBox" name="buttonBox">
+     <property name="orientation">
+      <enum>Qt::Horizontal</enum>
+     </property>
+     <property name="standardButtons">
+      <set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
+     </property>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <customwidgets>
+  <customwidget>
+   <class>ObjectSelectorWidget</class>
+   <extends>QWidget</extends>
+   <header>widgets/objectselectorwidget.h</header>
+   <container>1</container>
+  </customwidget>
+ </customwidgets>
+ <resources>
+  <include location="../../resources_editor.qrc"/>
+ </resources>
+ <connections>
+  <connection>
+   <sender>buttonBox</sender>
+   <signal>accepted()</signal>
+   <receiver>SetGravityDialog</receiver>
+   <slot>accept()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>257</x>
+     <y>419</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>157</x>
+     <y>274</y>
+    </hint>
+   </hints>
+  </connection>
+  <connection>
+   <sender>buttonBox</sender>
+   <signal>rejected()</signal>
+   <receiver>SetGravityDialog</receiver>
+   <slot>reject()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>325</x>
+     <y>419</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>286</x>
+     <y>274</y>
+    </hint>
+   </hints>
+  </connection>
+  <connection>
+   <sender>radioButtonObject</sender>
+   <signal>toggled(bool)</signal>
+   <receiver>widgetObject</receiver>
+   <slot>setVisible(bool)</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>127</x>
+     <y>115</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>289</x>
+     <y>115</y>
+    </hint>
+   </hints>
+  </connection>
+ </connections>
+</ui>
diff --git a/src/editor/dialogs/actions/speedhorizontaldialog.cpp b/src/editor/dialogs/actions/speedhorizontaldialog.cpp
index b325b49..ea33686 100644
--- a/src/editor/dialogs/actions/speedhorizontaldialog.cpp
+++ b/src/editor/dialogs/actions/speedhorizontaldialog.cpp
@@ -3,13 +3,23 @@
 
 #include <QPushButton>
 
-SpeedHorizontalDialog::SpeedHorizontalDialog(SpeedHorizontalAction &action, QWidget *parent) :
+SpeedHorizontalDialog::SpeedHorizontalDialog(SpeedHorizontalAction &action, ProjectTreeModel *projectModel, QWidget *parent) :
     QDialog{parent},
     m_ui{std::make_unique<Ui::SpeedHorizontalDialog>()},
     m_action{action}
 {
     m_ui->setupUi(this);
 
+    {
+        QSizePolicy sp_retain = m_ui->widgetObject->sizePolicy();
+        sp_retain.setRetainSizeWhenHidden(true);
+        m_ui->widgetObject->setSizePolicy(sp_retain);
+    }
+    m_ui->widgetObject->setProjectModel(projectModel);
+
+    m_ui->widgetObject->setEmptySelectionText(tr("self"));
+    m_ui->widgetObject->setShowClearObjectAction(false);
+
     if (auto button = m_ui->buttonBox->button(QDialogButtonBox::Ok))
         button->setIcon(QIcon{":/qtgameengine/icons/ok.png"});
     if (auto button = m_ui->buttonBox->button(QDialogButtonBox::Cancel))
diff --git a/src/editor/dialogs/actions/speedhorizontaldialog.h b/src/editor/dialogs/actions/speedhorizontaldialog.h
index 51c96e9..49c4ca3 100644
--- a/src/editor/dialogs/actions/speedhorizontaldialog.h
+++ b/src/editor/dialogs/actions/speedhorizontaldialog.h
@@ -6,13 +6,14 @@
 
 namespace Ui { class SpeedHorizontalDialog; }
 struct SpeedHorizontalAction;
+class ProjectTreeModel;
 
 class SpeedHorizontalDialog : public QDialog
 {
     Q_OBJECT
 
 public:
-    explicit SpeedHorizontalDialog(SpeedHorizontalAction &action, QWidget *parent = nullptr);
+    explicit SpeedHorizontalDialog(SpeedHorizontalAction &action, ProjectTreeModel *projectModel, QWidget *parent = nullptr);
     ~SpeedHorizontalDialog() override;
 
 private:
diff --git a/src/editor/dialogs/actions/speedhorizontaldialog.ui b/src/editor/dialogs/actions/speedhorizontaldialog.ui
index 3a1e2cb..93af3bb 100644
--- a/src/editor/dialogs/actions/speedhorizontaldialog.ui
+++ b/src/editor/dialogs/actions/speedhorizontaldialog.ui
@@ -6,31 +6,183 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>400</width>
-    <height>300</height>
+    <width>435</width>
+    <height>429</height>
    </rect>
   </property>
   <property name="windowTitle">
-   <string>Dialog</string>
+   <string>Speed Horizontal</string>
   </property>
-  <widget class="QDialogButtonBox" name="buttonBox">
-   <property name="geometry">
-    <rect>
-     <x>30</x>
-     <y>240</y>
-     <width>341</width>
-     <height>32</height>
-    </rect>
-   </property>
-   <property name="orientation">
-    <enum>Qt::Horizontal</enum>
-   </property>
-   <property name="standardButtons">
-    <set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
-   </property>
-  </widget>
+  <layout class="QVBoxLayout" name="verticalLayout_2" stretch="0,1,0">
+   <item>
+    <layout class="QHBoxLayout" name="horizontalLayout" stretch="0,1">
+     <item>
+      <widget class="QLabel" name="label">
+       <property name="text">
+        <string/>
+       </property>
+       <property name="pixmap">
+        <pixmap resource="../../resources_editor.qrc">:/qtgameengine/icons/action-speed-horizontal.png</pixmap>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QGroupBox" name="groupBox">
+       <property name="title">
+        <string>Applies to</string>
+       </property>
+       <layout class="QVBoxLayout" name="verticalLayout">
+        <item>
+         <widget class="QRadioButton" name="radioButtonSelf">
+          <property name="text">
+           <string>Self</string>
+          </property>
+          <property name="checked">
+           <bool>true</bool>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="QRadioButton" name="radioButtonOther">
+          <property name="text">
+           <string>Other</string>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <layout class="QHBoxLayout" name="horizontalLayout_2" stretch="0,1">
+          <item>
+           <widget class="QRadioButton" name="radioButtonObject">
+            <property name="text">
+             <string>Object:</string>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="ObjectSelectorWidget" name="widgetObject" native="true">
+            <property name="visible">
+             <bool>false</bool>
+            </property>
+           </widget>
+          </item>
+         </layout>
+        </item>
+       </layout>
+      </widget>
+     </item>
+    </layout>
+   </item>
+   <item>
+    <widget class="QFrame" name="frame">
+     <property name="frameShape">
+      <enum>QFrame::StyledPanel</enum>
+     </property>
+     <property name="frameShadow">
+      <enum>QFrame::Raised</enum>
+     </property>
+     <layout class="QGridLayout" name="gridLayout_2">
+      <item row="1" column="2">
+       <spacer name="horizontalSpacer_2">
+        <property name="orientation">
+         <enum>Qt::Horizontal</enum>
+        </property>
+        <property name="sizeHint" stdset="0">
+         <size>
+          <width>40</width>
+          <height>20</height>
+         </size>
+        </property>
+       </spacer>
+      </item>
+      <item row="0" column="1">
+       <spacer name="verticalSpacer">
+        <property name="orientation">
+         <enum>Qt::Vertical</enum>
+        </property>
+        <property name="sizeHint" stdset="0">
+         <size>
+          <width>20</width>
+          <height>40</height>
+         </size>
+        </property>
+       </spacer>
+      </item>
+      <item row="2" column="1">
+       <spacer name="verticalSpacer_2">
+        <property name="orientation">
+         <enum>Qt::Vertical</enum>
+        </property>
+        <property name="sizeHint" stdset="0">
+         <size>
+          <width>20</width>
+          <height>40</height>
+         </size>
+        </property>
+       </spacer>
+      </item>
+      <item row="1" column="0">
+       <spacer name="horizontalSpacer">
+        <property name="orientation">
+         <enum>Qt::Horizontal</enum>
+        </property>
+        <property name="sizeHint" stdset="0">
+         <size>
+          <width>40</width>
+          <height>20</height>
+         </size>
+        </property>
+       </spacer>
+      </item>
+      <item row="1" column="1">
+       <layout class="QFormLayout" name="formLayout">
+        <item row="0" column="0">
+         <widget class="QLabel" name="labelHorSpeed">
+          <property name="text">
+           <string>hor. speed:</string>
+          </property>
+          <property name="buddy">
+           <cstring>spinBoxHorSpeed</cstring>
+          </property>
+         </widget>
+        </item>
+        <item row="0" column="1">
+         <widget class="QSpinBox" name="spinBoxHorSpeed"/>
+        </item>
+        <item row="1" column="1">
+         <widget class="QCheckBox" name="checkBoxRelative">
+          <property name="text">
+           <string>Relative</string>
+          </property>
+         </widget>
+        </item>
+       </layout>
+      </item>
+     </layout>
+    </widget>
+   </item>
+   <item>
+    <widget class="QDialogButtonBox" name="buttonBox">
+     <property name="orientation">
+      <enum>Qt::Horizontal</enum>
+     </property>
+     <property name="standardButtons">
+      <set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
+     </property>
+    </widget>
+   </item>
+  </layout>
  </widget>
- <resources/>
+ <customwidgets>
+  <customwidget>
+   <class>ObjectSelectorWidget</class>
+   <extends>QWidget</extends>
+   <header>widgets/objectselectorwidget.h</header>
+   <container>1</container>
+  </customwidget>
+ </customwidgets>
+ <resources>
+  <include location="../../resources_editor.qrc"/>
+ </resources>
  <connections>
   <connection>
    <sender>buttonBox</sender>
@@ -39,8 +191,8 @@
    <slot>accept()</slot>
    <hints>
     <hint type="sourcelabel">
-     <x>248</x>
-     <y>254</y>
+     <x>257</x>
+     <y>419</y>
     </hint>
     <hint type="destinationlabel">
      <x>157</x>
@@ -55,8 +207,8 @@
    <slot>reject()</slot>
    <hints>
     <hint type="sourcelabel">
-     <x>316</x>
-     <y>260</y>
+     <x>325</x>
+     <y>419</y>
     </hint>
     <hint type="destinationlabel">
      <x>286</x>
@@ -64,5 +216,21 @@
     </hint>
    </hints>
   </connection>
+  <connection>
+   <sender>radioButtonObject</sender>
+   <signal>toggled(bool)</signal>
+   <receiver>widgetObject</receiver>
+   <slot>setVisible(bool)</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>127</x>
+     <y>115</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>289</x>
+     <y>115</y>
+    </hint>
+   </hints>
+  </connection>
  </connections>
 </ui>
diff --git a/src/editor/dialogs/actions/speedverticaldialog.cpp b/src/editor/dialogs/actions/speedverticaldialog.cpp
index 1af4a83..22342a0 100644
--- a/src/editor/dialogs/actions/speedverticaldialog.cpp
+++ b/src/editor/dialogs/actions/speedverticaldialog.cpp
@@ -3,13 +3,23 @@
 
 #include <QPushButton>
 
-SpeedVerticalDialog::SpeedVerticalDialog(SpeedVerticalAction &action, QWidget *parent) :
+SpeedVerticalDialog::SpeedVerticalDialog(SpeedVerticalAction &action, ProjectTreeModel *projectModel, QWidget *parent) :
     QDialog{parent},
     m_ui{std::make_unique<Ui::SpeedVerticalDialog>()},
     m_action{action}
 {
     m_ui->setupUi(this);
 
+    {
+        QSizePolicy sp_retain = m_ui->widgetObject->sizePolicy();
+        sp_retain.setRetainSizeWhenHidden(true);
+        m_ui->widgetObject->setSizePolicy(sp_retain);
+    }
+    m_ui->widgetObject->setProjectModel(projectModel);
+
+    m_ui->widgetObject->setEmptySelectionText(tr("self"));
+    m_ui->widgetObject->setShowClearObjectAction(false);
+
     if (auto button = m_ui->buttonBox->button(QDialogButtonBox::Ok))
         button->setIcon(QIcon{":/qtgameengine/icons/ok.png"});
     if (auto button = m_ui->buttonBox->button(QDialogButtonBox::Cancel))
diff --git a/src/editor/dialogs/actions/speedverticaldialog.h b/src/editor/dialogs/actions/speedverticaldialog.h
index 70749f9..f686936 100644
--- a/src/editor/dialogs/actions/speedverticaldialog.h
+++ b/src/editor/dialogs/actions/speedverticaldialog.h
@@ -6,13 +6,14 @@
 
 namespace Ui { class SpeedVerticalDialog; }
 struct SpeedVerticalAction;
+class ProjectTreeModel;
 
 class SpeedVerticalDialog : public QDialog
 {
     Q_OBJECT
 
 public:
-    explicit SpeedVerticalDialog(SpeedVerticalAction &action, QWidget *parent = nullptr);
+    explicit SpeedVerticalDialog(SpeedVerticalAction &action, ProjectTreeModel *projectModel, QWidget *parent = nullptr);
     ~SpeedVerticalDialog() override;
 
 private:
diff --git a/src/editor/dialogs/actions/speedverticaldialog.ui b/src/editor/dialogs/actions/speedverticaldialog.ui
index 3981708..afe76d7 100644
--- a/src/editor/dialogs/actions/speedverticaldialog.ui
+++ b/src/editor/dialogs/actions/speedverticaldialog.ui
@@ -6,31 +6,183 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>400</width>
-    <height>300</height>
+    <width>435</width>
+    <height>429</height>
    </rect>
   </property>
   <property name="windowTitle">
-   <string>Dialog</string>
+   <string>Speed Vertical</string>
   </property>
-  <widget class="QDialogButtonBox" name="buttonBox">
-   <property name="geometry">
-    <rect>
-     <x>30</x>
-     <y>240</y>
-     <width>341</width>
-     <height>32</height>
-    </rect>
-   </property>
-   <property name="orientation">
-    <enum>Qt::Horizontal</enum>
-   </property>
-   <property name="standardButtons">
-    <set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
-   </property>
-  </widget>
+  <layout class="QVBoxLayout" name="verticalLayout_2" stretch="0,1,0">
+   <item>
+    <layout class="QHBoxLayout" name="horizontalLayout" stretch="0,1">
+     <item>
+      <widget class="QLabel" name="label">
+       <property name="text">
+        <string/>
+       </property>
+       <property name="pixmap">
+        <pixmap resource="../../resources_editor.qrc">:/qtgameengine/icons/action-speed-vertical.png</pixmap>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QGroupBox" name="groupBox">
+       <property name="title">
+        <string>Applies to</string>
+       </property>
+       <layout class="QVBoxLayout" name="verticalLayout">
+        <item>
+         <widget class="QRadioButton" name="radioButtonSelf">
+          <property name="text">
+           <string>Self</string>
+          </property>
+          <property name="checked">
+           <bool>true</bool>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="QRadioButton" name="radioButtonOther">
+          <property name="text">
+           <string>Other</string>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <layout class="QHBoxLayout" name="horizontalLayout_2" stretch="0,1">
+          <item>
+           <widget class="QRadioButton" name="radioButtonObject">
+            <property name="text">
+             <string>Object:</string>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="ObjectSelectorWidget" name="widgetObject" native="true">
+            <property name="visible">
+             <bool>false</bool>
+            </property>
+           </widget>
+          </item>
+         </layout>
+        </item>
+       </layout>
+      </widget>
+     </item>
+    </layout>
+   </item>
+   <item>
+    <widget class="QFrame" name="frame">
+     <property name="frameShape">
+      <enum>QFrame::StyledPanel</enum>
+     </property>
+     <property name="frameShadow">
+      <enum>QFrame::Raised</enum>
+     </property>
+     <layout class="QGridLayout" name="gridLayout_2">
+      <item row="1" column="2">
+       <spacer name="horizontalSpacer_2">
+        <property name="orientation">
+         <enum>Qt::Horizontal</enum>
+        </property>
+        <property name="sizeHint" stdset="0">
+         <size>
+          <width>40</width>
+          <height>20</height>
+         </size>
+        </property>
+       </spacer>
+      </item>
+      <item row="0" column="1">
+       <spacer name="verticalSpacer">
+        <property name="orientation">
+         <enum>Qt::Vertical</enum>
+        </property>
+        <property name="sizeHint" stdset="0">
+         <size>
+          <width>20</width>
+          <height>40</height>
+         </size>
+        </property>
+       </spacer>
+      </item>
+      <item row="2" column="1">
+       <spacer name="verticalSpacer_2">
+        <property name="orientation">
+         <enum>Qt::Vertical</enum>
+        </property>
+        <property name="sizeHint" stdset="0">
+         <size>
+          <width>20</width>
+          <height>40</height>
+         </size>
+        </property>
+       </spacer>
+      </item>
+      <item row="1" column="0">
+       <spacer name="horizontalSpacer">
+        <property name="orientation">
+         <enum>Qt::Horizontal</enum>
+        </property>
+        <property name="sizeHint" stdset="0">
+         <size>
+          <width>40</width>
+          <height>20</height>
+         </size>
+        </property>
+       </spacer>
+      </item>
+      <item row="1" column="1">
+       <layout class="QFormLayout" name="formLayout">
+        <item row="0" column="0">
+         <widget class="QLabel" name="labelVertSpeed">
+          <property name="text">
+           <string>vert. speed:</string>
+          </property>
+          <property name="buddy">
+           <cstring>spinBoxVertSpeed</cstring>
+          </property>
+         </widget>
+        </item>
+        <item row="0" column="1">
+         <widget class="QSpinBox" name="spinBoxVertSpeed"/>
+        </item>
+        <item row="1" column="1">
+         <widget class="QCheckBox" name="checkBoxRelative">
+          <property name="text">
+           <string>Relative</string>
+          </property>
+         </widget>
+        </item>
+       </layout>
+      </item>
+     </layout>
+    </widget>
+   </item>
+   <item>
+    <widget class="QDialogButtonBox" name="buttonBox">
+     <property name="orientation">
+      <enum>Qt::Horizontal</enum>
+     </property>
+     <property name="standardButtons">
+      <set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
+     </property>
+    </widget>
+   </item>
+  </layout>
  </widget>
- <resources/>
+ <customwidgets>
+  <customwidget>
+   <class>ObjectSelectorWidget</class>
+   <extends>QWidget</extends>
+   <header>widgets/objectselectorwidget.h</header>
+   <container>1</container>
+  </customwidget>
+ </customwidgets>
+ <resources>
+  <include location="../../resources_editor.qrc"/>
+ </resources>
  <connections>
   <connection>
    <sender>buttonBox</sender>
@@ -39,8 +191,8 @@
    <slot>accept()</slot>
    <hints>
     <hint type="sourcelabel">
-     <x>248</x>
-     <y>254</y>
+     <x>257</x>
+     <y>419</y>
     </hint>
     <hint type="destinationlabel">
      <x>157</x>
@@ -55,8 +207,8 @@
    <slot>reject()</slot>
    <hints>
     <hint type="sourcelabel">
-     <x>316</x>
-     <y>260</y>
+     <x>325</x>
+     <y>419</y>
     </hint>
     <hint type="destinationlabel">
      <x>286</x>
@@ -64,5 +216,21 @@
     </hint>
    </hints>
   </connection>
+  <connection>
+   <sender>radioButtonObject</sender>
+   <signal>toggled(bool)</signal>
+   <receiver>widgetObject</receiver>
+   <slot>setVisible(bool)</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>127</x>
+     <y>115</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>289</x>
+     <y>115</y>
+    </hint>
+   </hints>
+  </connection>
  </connections>
 </ui>
diff --git a/src/editor/dialogs/codeeditordialog.cpp b/src/editor/dialogs/codeeditordialog.cpp
index 82b9d44..69ba018 100644
--- a/src/editor/dialogs/codeeditordialog.cpp
+++ b/src/editor/dialogs/codeeditordialog.cpp
@@ -115,9 +115,9 @@ void CodeEditorDialog::changed()
     }
 }
 
-void CodeEditorDialog::addToolbarWidget(QWidget *widget)
+QAction *CodeEditorDialog::addToolbarWidget(QWidget *widget)
 {
-    m_ui->toolBar->addWidget(widget);
+    return m_ui->toolBar->addWidget(widget);
 }
 
 void CodeEditorDialog::loadCode()
diff --git a/src/editor/dialogs/codeeditordialog.h b/src/editor/dialogs/codeeditordialog.h
index cac7a5f..a75c9b2 100644
--- a/src/editor/dialogs/codeeditordialog.h
+++ b/src/editor/dialogs/codeeditordialog.h
@@ -30,7 +30,7 @@ protected slots:
 protected:
     bool m_unsavedChanges{};
 
-    void addToolbarWidget(QWidget *widget);
+    QAction *addToolbarWidget(QWidget *widget);
 
 private slots:
     void loadCode();
diff --git a/src/editor/dialogs/objectpropertiesdialog.cpp b/src/editor/dialogs/objectpropertiesdialog.cpp
index f2b7ab8..e07eee2 100644
--- a/src/editor/dialogs/objectpropertiesdialog.cpp
+++ b/src/editor/dialogs/objectpropertiesdialog.cpp
@@ -22,10 +22,8 @@ ObjectPropertiesDialog::ObjectPropertiesDialog(Object &object, ProjectTreeModel
     m_collisionEvents{m_object.collisionEvents},
     m_eventsModel{std::make_unique<ObjectEventsModel>(m_events, m_collisionEvents)},
     m_menuSprites{new QMenu{this}},
-    m_menuParents{new QMenu{this}},
     m_menuMaskSprites{new QMenu{this}},
     m_spriteName{object.spriteName},
-    m_parentName{object.parentName},
     m_maskSpriteName{object.maskSpriteName}
 {
     m_ui->setupUi(this);
@@ -37,13 +35,20 @@ ObjectPropertiesDialog::ObjectPropertiesDialog(Object &object, ProjectTreeModel
     if (auto button = m_ui->buttonBox->button(QDialogButtonBox::Cancel))
         button->setIcon(QIcon{":/qtgameengine/icons/delete.png"});
 
+    m_ui->widgetParent->setProjectModel(&m_projectModel);
+    m_ui->widgetParent->setForbiddenObjectName(m_object.name);
+    m_ui->actionsWidget->setProjectModel(&m_projectModel);
+
     m_ui->lineEditName->setText(m_object.name);
     m_ui->lineEditSprite->setText(m_spriteName.isEmpty() ? tr("<no sprite>") : m_spriteName);
-    m_ui->lineEditParent->setText(m_parentName.isEmpty() ? tr("<no parent>") : m_parentName);
+    m_ui->widgetParent->setEmptySelectionText(tr("<no parent>"));
+    if (QSignalBlocker blocker{m_ui->widgetParent}; object.parentName.isEmpty())
+        m_ui->widgetParent->clearObject();
+    else
+        m_ui->widgetParent->setObject(object.parentName);
     m_ui->lineEditMask->setText(m_maskSpriteName.isEmpty() ? tr("<same as sprite>") : m_maskSpriteName);
     updateSpritePreview();
     m_ui->toolButtonSprite->setMenu(m_menuSprites);
-    m_ui->toolButtonParent->setMenu(m_menuParents);
     m_ui->toolButtonMask->setMenu(m_menuMaskSprites);
     m_ui->checkBoxVisible->setChecked(m_object.visible);
     m_ui->checkBoxSolid->setChecked(m_object.solid);
@@ -51,7 +56,6 @@ ObjectPropertiesDialog::ObjectPropertiesDialog(Object &object, ProjectTreeModel
     m_ui->checkBoxPersistent->setChecked(m_object.persistent);
 
     m_ui->lineEditSprite->setMenu(m_menuSprites);
-    m_ui->lineEditParent->setMenu(m_menuParents);
     m_ui->lineEditMask->setMenu(m_menuMaskSprites);
 
     m_ui->listViewEvents->setModel(m_eventsModel.get());
@@ -104,11 +108,12 @@ ObjectPropertiesDialog::ObjectPropertiesDialog(Object &object, ProjectTreeModel
 
     connect(m_menuSprites, &QMenu::aboutToShow,
             this, &ObjectPropertiesDialog::spritesMenuAboutToShow);
-    connect(m_menuParents, &QMenu::aboutToShow,
-            this, &ObjectPropertiesDialog::parentsMenuAboutToShow);
     connect(m_menuMaskSprites, &QMenu::aboutToShow,
             this, &ObjectPropertiesDialog::maskSpritesMenuAboutToShow);
 
+    connect(m_ui->widgetParent, &ObjectSelectorWidget::changed,
+            this, &ObjectPropertiesDialog::changed);
+
     connect(m_ui->listViewEvents->selectionModel(), &QItemSelectionModel::currentChanged,
             this, &ObjectPropertiesDialog::currentEventChanged);
 
@@ -148,7 +153,7 @@ void ObjectPropertiesDialog::accept()
     m_object.solid = m_ui->checkBoxSolid->isChecked();
     m_object.depth = m_ui->spinBoxDepth->value();
     m_object.persistent = m_ui->checkBoxPersistent->isChecked();
-    m_object.parentName = m_parentName;
+    m_object.parentName = m_ui->widgetParent->objectName();
     m_object.maskSpriteName = m_maskSpriteName;
     m_object.events = std::move(m_events);
     m_object.collisionEvents = std::move(m_collisionEvents);
@@ -283,11 +288,9 @@ void ObjectPropertiesDialog::objectNameChanged(const Object &object, const QStri
         updateTitle();
     }
 
-    if (!m_parentName.isEmpty() && m_parentName == oldName)
-    {
-        m_parentName = object.name;
-        m_ui->lineEditParent->setText(object.name);
-    }
+    if (QSignalBlocker blocker{m_ui->widgetParent};
+        !m_ui->widgetParent->objectName().isEmpty() && m_ui->widgetParent->objectName() == oldName)
+        m_ui->widgetParent->setObject(object.name);
 }
 
 void ObjectPropertiesDialog::spriteNameChanged(const Sprite &sprite, const QString &oldName)
@@ -314,11 +317,9 @@ void ObjectPropertiesDialog::spriteNameChanged(const Sprite &sprite, const QStri
 
 void ObjectPropertiesDialog::objectAboutToBeRemoved(const Object &object)
 {
-    if (!m_parentName.isEmpty() && m_parentName == object.name)
-    {
-        m_parentName.clear();
-        m_ui->lineEditParent->setText(tr("<no parent>"));
-    }
+    if (QSignalBlocker blocker{m_ui->widgetParent};
+        !m_ui->widgetParent->objectName().isEmpty() && m_ui->widgetParent->objectName() == object.name)
+        m_ui->widgetParent->clearObject();
 }
 
 void ObjectPropertiesDialog::spriteAboutToBeRemoved(const Sprite &sprite)
@@ -365,29 +366,6 @@ void ObjectPropertiesDialog::spritesMenuAboutToShow()
                                  [&sprite,this](){ setSprite(sprite); });
 }
 
-void ObjectPropertiesDialog::parentsMenuAboutToShow()
-{
-    m_menuParents->clear();
-    m_menuParents->addAction(tr("<no parent>"), this, &ObjectPropertiesDialog::clearParent);
-    for (const Object &object : m_projectModel.project()->objects)
-    {
-        QIcon icon;
-        if (!object.spriteName.isEmpty())
-        {
-            const auto &sprites = m_projectModel.project()->sprites;
-            const auto iter = std::find_if(std::cbegin(sprites), std::cend(sprites),
-                                           [&](const Sprite &sprite){ return sprite.name == object.spriteName; });
-            if (iter != std::cend(sprites))
-            {
-                if (!iter->pixmaps.empty())
-                    icon = iter->pixmaps.front();
-            }
-        }
-        m_menuParents->addAction(icon, object.name, this,
-                                 [&object,this](){ setParent(object); });
-    }
-}
-
 void ObjectPropertiesDialog::maskSpritesMenuAboutToShow()
 {
     m_menuMaskSprites->clear();
@@ -449,26 +427,6 @@ void ObjectPropertiesDialog::setSprite(const Sprite &sprite)
     changed();
 }
 
-void ObjectPropertiesDialog::clearParent()
-{
-    m_parentName.clear();
-    m_ui->lineEditParent->setText(tr("<no parent>"));
-    changed();
-}
-
-void ObjectPropertiesDialog::setParent(const Object &object)
-{
-    if (&m_object == &object)
-    {
-        QMessageBox::warning(this, tr("This will create a loop in parents."), tr("This will create a loop in parents."));
-        return;
-    }
-
-    m_parentName = object.name;
-    m_ui->lineEditParent->setText(object.name);
-    changed();
-}
-
 void ObjectPropertiesDialog::clearMaskSprite()
 {
     m_maskSpriteName.clear();
diff --git a/src/editor/dialogs/objectpropertiesdialog.h b/src/editor/dialogs/objectpropertiesdialog.h
index 1594646..947d95a 100644
--- a/src/editor/dialogs/objectpropertiesdialog.h
+++ b/src/editor/dialogs/objectpropertiesdialog.h
@@ -42,7 +42,6 @@ private slots:
     void spritePixmapsChanged(const Sprite &sprite);
 
     void spritesMenuAboutToShow();
-    void parentsMenuAboutToShow();
     void maskSpritesMenuAboutToShow();
     void currentEventChanged(const QModelIndex &index);
     void eventsContextMenuRequested(const QPoint &pos);
@@ -51,9 +50,6 @@ private slots:
     void clearSprite();
     void setSprite(const Sprite &sprite);
 
-    void clearParent();
-    void setParent(const Object &object);
-
     void clearMaskSprite();
     void setMaskSprite(const Sprite &sprite);
 
@@ -74,11 +70,9 @@ private:
     const std::unique_ptr<ObjectEventsModel> m_eventsModel;
 
     QMenu * const m_menuSprites;
-    QMenu * const m_menuParents;
     QMenu * const m_menuMaskSprites;
 
     QString m_spriteName;
-    QString m_parentName;
     QString m_maskSpriteName;
 
     bool m_unsavedChanges{};
diff --git a/src/editor/dialogs/objectpropertiesdialog.ui b/src/editor/dialogs/objectpropertiesdialog.ui
index 464c0b6..6e14acd 100644
--- a/src/editor/dialogs/objectpropertiesdialog.ui
+++ b/src/editor/dialogs/objectpropertiesdialog.ui
@@ -204,42 +204,12 @@
           <string>Parent:</string>
          </property>
          <property name="buddy">
-          <cstring>lineEditParent</cstring>
+          <cstring>widgetParent</cstring>
          </property>
         </widget>
        </item>
        <item row="2" column="1">
-        <layout class="QHBoxLayout" name="horizontalLayout_2">
-         <item>
-          <widget class="QLineEditWithMenu" name="lineEditParent">
-           <property name="sizePolicy">
-            <sizepolicy hsizetype="Ignored" vsizetype="Fixed">
-             <horstretch>0</horstretch>
-             <verstretch>0</verstretch>
-            </sizepolicy>
-           </property>
-           <property name="toolTip">
-            <string>The parent from which events and actions are</string>
-           </property>
-           <property name="text">
-            <string>&lt;no parent&gt;</string>
-           </property>
-           <property name="readOnly">
-            <bool>true</bool>
-           </property>
-          </widget>
-         </item>
-         <item>
-          <widget class="QToolButton" name="toolButtonParent">
-           <property name="text">
-            <string>...</string>
-           </property>
-           <property name="popupMode">
-            <enum>QToolButton::InstantPopup</enum>
-           </property>
-          </widget>
-         </item>
-        </layout>
+        <widget class="ObjectParentSelectorWidget" name="widgetParent" native="true"/>
        </item>
        <item row="3" column="1">
         <layout class="QHBoxLayout" name="horizontalLayout_3">
@@ -431,6 +401,12 @@
    <extends>QLineEdit</extends>
    <header>widgets/qlineeditwithmenu.h</header>
   </customwidget>
+  <customwidget>
+   <class>ObjectParentSelectorWidget</class>
+   <extends>QWidget</extends>
+   <header>widgets/objectparentselectorwidget.h</header>
+   <container>1</container>
+  </customwidget>
  </customwidgets>
  <resources>
   <include location="../resources_editor.qrc"/>
diff --git a/src/editor/icons/action-set-gravity.png b/src/editor/icons/action-set-gravity.png
new file mode 100644
index 0000000000000000000000000000000000000000..3e92bbe0f1eca2b5c1f1866c05355930ab860605
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HcmV?d00001

diff --git a/src/editor/models/actionscontainermodel.cpp b/src/editor/models/actionscontainermodel.cpp
index 385c2d4..3d8917c 100644
--- a/src/editor/models/actionscontainermodel.cpp
+++ b/src/editor/models/actionscontainermodel.cpp
@@ -54,6 +54,8 @@ QVariant ActionsContainerModel::data(const QModelIndex &index, int role) const
             return tr("Set the horizontal speed");
         else if (std::holds_alternative<SpeedVerticalAction>(action))
             return tr("Set the vertical speed");
+        else if (std::holds_alternative<SetGravityAction>(action))
+            return tr("Set the gravity");
         else if (std::holds_alternative<ExecuteCodeAction>(action))
             return tr("Execute a piece of code");
         else
@@ -72,6 +74,8 @@ QVariant ActionsContainerModel::data(const QModelIndex &index, int role) const
             return QIcon{":/qtgameengine/icons/action-speed-horizontal.png"};
         else if (std::holds_alternative<SpeedVerticalAction>(action))
             return QIcon{":/qtgameengine/icons/action-speed-vertical.png"};
+        else if (std::holds_alternative<SetGravityAction>(action))
+            return QIcon{":/qtgameengine/icons/action-set-gravity.png"};
         else if (std::holds_alternative<ExecuteCodeAction>(action))
             return QIcon{":/qtgameengine/icons/action-execute-code.png"};
         else
diff --git a/src/editor/models/actionscontainermodel.h b/src/editor/models/actionscontainermodel.h
index 19a555b..27696fe 100644
--- a/src/editor/models/actionscontainermodel.h
+++ b/src/editor/models/actionscontainermodel.h
@@ -28,7 +28,8 @@ public:
     bool removeRows(int row, int count, const QModelIndex &parent) override;
     bool moveRows(const QModelIndex &sourceParent, int sourceRow, int count, const QModelIndex &destinationParent, int destinationChild) override;
 
-    ActionsContainer *actionsContainer() const { return m_actionsContainer; }
+    ActionsContainer *actionsContainer() { return m_actionsContainer; }
+    const ActionsContainer *actionsContainer() const { return m_actionsContainer; }
     void setActionsContainer(ActionsContainer *actionsContainer);
 
     Action *getAction(const QModelIndex &index);
diff --git a/src/editor/resources_editor.qrc b/src/editor/resources_editor.qrc
index bbf428e..fe47c6e 100644
--- a/src/editor/resources_editor.qrc
+++ b/src/editor/resources_editor.qrc
@@ -5,6 +5,7 @@
         <file>icons/action-move-fixed.png</file>
         <file>icons/action-move-free.png</file>
         <file>icons/action-move-towards.png</file>
+        <file>icons/action-set-gravity.png</file>
         <file>icons/action-speed-horizontal.png</file>
         <file>icons/action-speed-vertical.png</file>
         <file>icons/add.png</file>
diff --git a/src/editor/widgets/actionscontainerwidget.cpp b/src/editor/widgets/actionscontainerwidget.cpp
index 8bc77d4..9e6ba7e 100644
--- a/src/editor/widgets/actionscontainerwidget.cpp
+++ b/src/editor/widgets/actionscontainerwidget.cpp
@@ -12,6 +12,7 @@
 #include "dialogs/actions/movetowardsdialog.h"
 #include "dialogs/actions/speedhorizontaldialog.h"
 #include "dialogs/actions/speedverticaldialog.h"
+#include "dialogs/actions/setgravitydialog.h"
 #include "dialogs/actions/executecodedialog.h"
 
 namespace {
@@ -21,6 +22,7 @@ template<> struct ActionDialogForImpl<MoveFreeAction> { using Dialog = MoveFreeD
 template<> struct ActionDialogForImpl<MoveTowardsAction> { using Dialog = MoveTowardsDialog; };
 template<> struct ActionDialogForImpl<SpeedHorizontalAction> { using Dialog = SpeedHorizontalDialog; };
 template<> struct ActionDialogForImpl<SpeedVerticalAction> { using Dialog = SpeedVerticalDialog; };
+template<> struct ActionDialogForImpl<SetGravityAction> { using Dialog = SetGravityDialog; };
 template<> struct ActionDialogForImpl<ExecuteCodeAction> { using Dialog = ExecuteCodeDialog; };
 template<typename T> using ActionDialogFor = ActionDialogForImpl<T>::Dialog;
 }
@@ -61,6 +63,8 @@ ActionsContainerWidget::ActionsContainerWidget(QWidget *parent) :
             this, &ActionsContainerWidget::createNewAction<SpeedHorizontalAction>);
     connect(m_ui->toolButtonSpeedVertical, &QAbstractButton::clicked,
             this, &ActionsContainerWidget::createNewAction<SpeedVerticalAction>);
+    connect(m_ui->toolButtonSetGravity, &QAbstractButton::clicked,
+            this, &ActionsContainerWidget::createNewAction<SetGravityAction>);
     connect(m_ui->toolButtonExecuteCode, &QAbstractButton::clicked,
             this, &ActionsContainerWidget::createNewAction<ExecuteCodeAction>);
 
@@ -69,12 +73,18 @@ ActionsContainerWidget::ActionsContainerWidget(QWidget *parent) :
     m_ui->toolButtonMoveTowards->setAction(MoveTowardsAction{});
     m_ui->toolButtonSpeedHorizontal->setAction(SpeedHorizontalAction{});
     m_ui->toolButtonSpeedVertical->setAction(SpeedVerticalAction{});
+    m_ui->toolButtonSetGravity->setAction(SetGravityAction{});
     m_ui->toolButtonExecuteCode->setAction(ExecuteCodeAction{});
 }
 
 ActionsContainerWidget::~ActionsContainerWidget() = default;
 
-ActionsContainer *ActionsContainerWidget::actionsContainer() const
+ActionsContainer *ActionsContainerWidget::actionsContainer()
+{
+    return m_actionsModel->actionsContainer();
+}
+
+const ActionsContainer *ActionsContainerWidget::actionsContainer() const
 {
     return m_actionsModel->actionsContainer();
 }
@@ -95,37 +105,43 @@ void ActionsContainerWidget::actionDoubleClicked(const QModelIndex &index)
 
     if (auto ptr = std::get_if<MoveFixedAction>(action))
     {
-        MoveFixedDialog dialog{*ptr, this};
+        MoveFixedDialog dialog{*ptr, m_projectModel, this};
         if (dialog.exec() == QDialog::Accepted)
             emit changed();
     }
     else if (auto ptr = std::get_if<MoveFreeAction>(action))
     {
-        MoveFreeDialog dialog{*ptr, this};
+        MoveFreeDialog dialog{*ptr, m_projectModel, this};
         if (dialog.exec() == QDialog::Accepted)
             emit changed();
     }
     else if (auto ptr = std::get_if<MoveTowardsAction>(action))
     {
-        MoveTowardsDialog dialog{*ptr, this};
+        MoveTowardsDialog dialog{*ptr, m_projectModel, this};
         if (dialog.exec() == QDialog::Accepted)
             emit changed();
     }
     else if (auto ptr = std::get_if<SpeedHorizontalAction>(action))
     {
-        SpeedHorizontalDialog dialog{*ptr, this};
+        SpeedHorizontalDialog dialog{*ptr, m_projectModel, this};
         if (dialog.exec() == QDialog::Accepted)
             emit changed();
     }
     else if (auto ptr = std::get_if<SpeedVerticalAction>(action))
     {
-        SpeedVerticalDialog dialog{*ptr, this};
+        SpeedVerticalDialog dialog{*ptr, m_projectModel, this};
+        if (dialog.exec() == QDialog::Accepted)
+            emit changed();
+    }
+    else if (auto ptr = std::get_if<SetGravityAction>(action))
+    {
+        SetGravityDialog dialog{*ptr, m_projectModel, this};
         if (dialog.exec() == QDialog::Accepted)
             emit changed();
     }
     else if (auto ptr = std::get_if<ExecuteCodeAction>(action))
     {
-        ExecuteCodeDialog dialog{*ptr, this};
+        ExecuteCodeDialog dialog{*ptr, m_projectModel, this};
         if (dialog.exec() == QDialog::Accepted)
             emit changed();
     }
@@ -205,7 +221,7 @@ void ActionsContainerWidget::createNewAction()
         return;
 
     T action;
-    ActionDialogFor<T> dialog{action, this};
+    ActionDialogFor<T> dialog{action, m_projectModel, this};
     if (dialog.exec() == QDialog::Accepted)
         m_actionsModel->appendAction(std::move(action));
 }
diff --git a/src/editor/widgets/actionscontainerwidget.h b/src/editor/widgets/actionscontainerwidget.h
index 44cbeb1..a2a1b4d 100644
--- a/src/editor/widgets/actionscontainerwidget.h
+++ b/src/editor/widgets/actionscontainerwidget.h
@@ -8,6 +8,7 @@
 
 namespace Ui { class ActionsContainerWidget; }
 class ActionsContainerModel;
+class ProjectTreeModel;
 
 class ActionsContainerWidget : public QWidget
 {
@@ -17,7 +18,12 @@ public:
     explicit ActionsContainerWidget(QWidget *parent = nullptr);
     ~ActionsContainerWidget();
 
-    ActionsContainer *actionsContainer() const;
+    ProjectTreeModel *projectModel() { return m_projectModel; }
+    const ProjectTreeModel *projectModel() const { return m_projectModel; }
+    void setProjectModel(ProjectTreeModel *projectModel) { m_projectModel = projectModel; }
+
+    ActionsContainer *actionsContainer();
+    const ActionsContainer *actionsContainer() const;
     void setActionsContainer(ActionsContainer *actionsContainer);
 
 signals:
@@ -35,4 +41,6 @@ private:
     const std::unique_ptr<Ui::ActionsContainerWidget> m_ui;
 
     const std::unique_ptr<ActionsContainerModel> m_actionsModel;
+
+    ProjectTreeModel *m_projectModel{};
 };
diff --git a/src/editor/widgets/actionscontainerwidget.ui b/src/editor/widgets/actionscontainerwidget.ui
index 6842209..f18ee3a 100644
--- a/src/editor/widgets/actionscontainerwidget.ui
+++ b/src/editor/widgets/actionscontainerwidget.ui
@@ -257,13 +257,13 @@
         </widget>
        </item>
        <item row="4" column="2">
-        <widget class="QToolButton" name="toolButtonSetGravity">
+        <widget class="ActionDragWidget" name="toolButtonSetGravity">
          <property name="toolTip">
           <string>Set Gravity</string>
          </property>
          <property name="icon">
           <iconset resource="../resources_editor.qrc">
-           <normaloff>:/qtgameengine/icons/action.png</normaloff>:/qtgameengine/icons/action.png</iconset>
+           <normaloff>:/qtgameengine/icons/action-set-gravity.png</normaloff>:/qtgameengine/icons/action-set-gravity.png</iconset>
          </property>
          <property name="iconSize">
           <size>
diff --git a/src/editor/widgets/objectparentselectorwidget.cpp b/src/editor/widgets/objectparentselectorwidget.cpp
new file mode 100644
index 0000000..03961bd
--- /dev/null
+++ b/src/editor/widgets/objectparentselectorwidget.cpp
@@ -0,0 +1,14 @@
+#include "objectparentselectorwidget.h"
+
+#include <QMessageBox>
+
+void ObjectParentSelectorWidget::setObject(const QString &objectName)
+{
+    if (!m_forbiddenObjectName.isEmpty() && m_forbiddenObjectName == objectName)
+    {
+        QMessageBox::warning(this, tr("This will create a loop in parents."), tr("This will create a loop in parents."));
+        return;
+    }
+
+    ObjectSelectorWidget::setObject(objectName);
+}
diff --git a/src/editor/widgets/objectparentselectorwidget.h b/src/editor/widgets/objectparentselectorwidget.h
new file mode 100644
index 0000000..52d703f
--- /dev/null
+++ b/src/editor/widgets/objectparentselectorwidget.h
@@ -0,0 +1,19 @@
+#pragma once
+
+#include "objectselectorwidget.h"
+
+class ObjectParentSelectorWidget : public ObjectSelectorWidget
+{
+    Q_OBJECT
+
+public:
+    using ObjectSelectorWidget::ObjectSelectorWidget;
+
+    QString forbiddenObjectName() const { return m_forbiddenObjectName; };
+    void setForbiddenObjectName(const QString &forbiddenObjectName) { m_forbiddenObjectName = forbiddenObjectName; }
+
+    void setObject(const QString &objectName) override;
+
+private:
+    QString m_forbiddenObjectName;
+};
diff --git a/src/editor/widgets/objectselectorwidget.cpp b/src/editor/widgets/objectselectorwidget.cpp
new file mode 100644
index 0000000..9b53c54
--- /dev/null
+++ b/src/editor/widgets/objectselectorwidget.cpp
@@ -0,0 +1,83 @@
+#include "objectselectorwidget.h"
+#include "ui_objectselectorwidget.h"
+
+#include <QMenu>
+#include <QDebug>
+
+#include "models/projecttreemodel.h"
+#include "projectcontainer.h"
+
+ObjectSelectorWidget::ObjectSelectorWidget(QWidget *parent) :
+    QWidget{parent},
+    m_ui{std::make_unique<Ui::ObjectSelectorWidget>()},
+    m_menuObjects{new QMenu{this}}
+{
+    m_ui->setupUi(this);
+
+    m_ui->lineEdit->setMenu(m_menuObjects);
+    m_ui->toolButton->setMenu(m_menuObjects);
+
+    connect(m_menuObjects, &QMenu::aboutToShow,
+            this, &ObjectSelectorWidget::menuAboutToShow);
+}
+
+ObjectSelectorWidget::~ObjectSelectorWidget() = default;
+
+void ObjectSelectorWidget::setObject(const QString &objectName)
+{
+    if (m_objectName == objectName)
+        return;
+
+    m_objectName = objectName;
+    m_ui->lineEdit->setText(objectName);
+    emit changed();
+}
+
+void ObjectSelectorWidget::clearObject()
+{
+    if (m_objectName.isEmpty())
+        return;
+
+    m_objectName.clear();
+    m_ui->lineEdit->setText(m_emptySelectionText);
+    emit changed();
+}
+
+void ObjectSelectorWidget::setEmptySelectionText(const QString &emptySelectionText)
+{
+    m_emptySelectionText = emptySelectionText;
+    if (m_objectName.isEmpty())
+        m_ui->lineEdit->setText(m_emptySelectionText);
+}
+
+void ObjectSelectorWidget::menuAboutToShow()
+{
+    if (!m_projectModel)
+    {
+        qCritical() << "no project model!";
+        return;
+    }
+
+    m_menuObjects->clear();
+
+    if (m_showClearObjectAction)
+        m_menuObjects->addAction(m_emptySelectionText, this, &ObjectSelectorWidget::clearObject);
+
+    for (const Object &object : m_projectModel->project()->objects)
+    {
+        QIcon icon;
+        if (!object.spriteName.isEmpty())
+        {
+            const auto &sprites = m_projectModel->project()->sprites;
+            const auto iter = std::find_if(std::cbegin(sprites), std::cend(sprites),
+                                           [&](const Sprite &sprite){ return sprite.name == object.spriteName; });
+            if (iter != std::cend(sprites))
+            {
+                if (!iter->pixmaps.empty())
+                    icon = iter->pixmaps.front();
+            }
+        }
+        m_menuObjects->addAction(icon, object.name, this,
+                                 [&object,this](){ setObject(object.name); });
+    }
+}
diff --git a/src/editor/widgets/objectselectorwidget.h b/src/editor/widgets/objectselectorwidget.h
new file mode 100644
index 0000000..b1c8996
--- /dev/null
+++ b/src/editor/widgets/objectselectorwidget.h
@@ -0,0 +1,51 @@
+#pragma once
+
+#include <QWidget>
+
+#include <memory>
+
+namespace Ui { class ObjectSelectorWidget; }
+class ProjectTreeModel;
+
+class ObjectSelectorWidget : public QWidget
+{
+    Q_OBJECT
+    Q_PROPERTY(QString emptySelectionText READ emptySelectionText WRITE setEmptySelectionText DESIGNABLE true FINAL)
+    Q_PROPERTY(bool showClearObjectAction READ showClearObjectAction WRITE setShowClearObjectAction DESIGNABLE true FINAL)
+
+public:
+    explicit ObjectSelectorWidget(QWidget *parent = nullptr);
+    ~ObjectSelectorWidget() override;
+
+    ProjectTreeModel *projectModel() { return m_projectModel; }
+    const ProjectTreeModel *projectModel() const { return m_projectModel; }
+    void setProjectModel(ProjectTreeModel *projectModel) { m_projectModel = projectModel; }
+
+    QString objectName() const { return m_objectName; }
+    virtual void setObject(const QString &objectName);
+    void clearObject();
+
+    QString emptySelectionText() const { return m_emptySelectionText; }
+    void setEmptySelectionText(const QString &emptySelectionText);
+
+    bool showClearObjectAction() const { return m_showClearObjectAction; }
+    void setShowClearObjectAction(bool showClearObjectAction) { m_showClearObjectAction = showClearObjectAction; }
+
+signals:
+    void changed();
+
+private slots:
+    void menuAboutToShow();
+
+private:
+    const std::unique_ptr<Ui::ObjectSelectorWidget> m_ui;
+
+    ProjectTreeModel *m_projectModel{};
+
+    QString m_objectName;
+
+    QString m_emptySelectionText;
+    bool m_showClearObjectAction;
+
+    QMenu * const m_menuObjects;
+};
diff --git a/src/editor/widgets/objectselectorwidget.ui b/src/editor/widgets/objectselectorwidget.ui
new file mode 100644
index 0000000..a9d5411
--- /dev/null
+++ b/src/editor/widgets/objectselectorwidget.ui
@@ -0,0 +1,59 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>ObjectSelectorWidget</class>
+ <widget class="QWidget" name="ObjectSelectorWidget">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>168</width>
+    <height>26</height>
+   </rect>
+  </property>
+  <property name="sizePolicy">
+   <sizepolicy hsizetype="Preferred" vsizetype="Minimum">
+    <horstretch>0</horstretch>
+    <verstretch>0</verstretch>
+   </sizepolicy>
+  </property>
+  <property name="windowTitle">
+   <string>Form</string>
+  </property>
+  <layout class="QHBoxLayout" name="horizontalLayout">
+   <property name="leftMargin">
+    <number>0</number>
+   </property>
+   <property name="topMargin">
+    <number>0</number>
+   </property>
+   <property name="rightMargin">
+    <number>0</number>
+   </property>
+   <property name="bottomMargin">
+    <number>0</number>
+   </property>
+   <item>
+    <widget class="QLineEditWithMenu" name="lineEdit"/>
+   </item>
+   <item>
+    <widget class="QToolButton" name="toolButton">
+     <property name="text">
+      <string>...</string>
+     </property>
+     <property name="popupMode">
+      <enum>QToolButton::InstantPopup</enum>
+     </property>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <customwidgets>
+  <customwidget>
+   <class>QLineEditWithMenu</class>
+   <extends>QLineEdit</extends>
+   <header>widgets/qlineeditwithmenu.h</header>
+  </customwidget>
+ </customwidgets>
+ <resources/>
+ <connections/>
+</ui>
diff --git a/src/projectcontainer.h b/src/projectcontainer.h
index ba98d6a..0df972d 100644
--- a/src/projectcontainer.h
+++ b/src/projectcontainer.h
@@ -157,35 +157,51 @@ struct Font
     } range;
 };
 
-struct MoveFixedAction {
+struct AppliesToSelf {
 
 };
 
+struct AppliesToOther {
+
+};
+
+struct AppliesToObject {
+    QString objectName;
+};
+
+using AppliesTo = std::variant<
+    AppliesToSelf,
+    AppliesToOther,
+    AppliesToObject
+>;
+
+struct MoveFixedAction {
+    AppliesTo appliesTo{AppliesToSelf{}};
+};
+
 struct MoveFreeAction {
-
+    AppliesTo appliesTo{AppliesToSelf{}};
 };
 
 struct MoveTowardsAction {
-
+    AppliesTo appliesTo{AppliesToSelf{}};
 };
 
 struct SpeedHorizontalAction {
+    AppliesTo appliesTo{AppliesToSelf{}};
+};
 
+struct SetGravityAction {
+    AppliesTo appliesTo{AppliesToSelf{}};
 };
 
 struct SpeedVerticalAction {
-
+    AppliesTo appliesTo{AppliesToSelf{}};
 };
 
 struct ExecuteCodeAction {
-    enum class AppliesTo {
-        Self,
-        Other,
-        Object
-    };
-
+    AppliesTo appliesTo{AppliesToSelf{}};
     QString script;
-    AppliesTo appliesTo{AppliesTo::Self};
 };
 
 using Action = std::variant<
@@ -194,6 +210,7 @@ using Action = std::variant<
     MoveTowardsAction,
     SpeedHorizontalAction,
     SpeedVerticalAction,
+    SetGravityAction,
     ExecuteCodeAction
 >;
 
diff --git a/src/projectserialization.cpp b/src/projectserialization.cpp
index d241617..3e00d56 100644
--- a/src/projectserialization.cpp
+++ b/src/projectserialization.cpp
@@ -262,87 +262,143 @@ QDataStream &operator>>(QDataStream &ds, Font &font)
     return ds;
 }
 
+QDataStream &operator<<(QDataStream &ds, const AppliesToSelf &action)
+{
+    Q_UNUSED(action);
+    //ds << action.;
+    return ds;
+}
+
+QDataStream &operator>>(QDataStream &ds, AppliesToSelf &action)
+{
+    Q_UNUSED(action);
+    //ds >> action.;
+    return ds;
+}
+
+QDataStream &operator<<(QDataStream &ds, const AppliesToOther &action)
+{
+    Q_UNUSED(action);
+    //ds << action.;
+    return ds;
+}
+
+QDataStream &operator>>(QDataStream &ds, AppliesToOther &action)
+{
+    Q_UNUSED(action);
+    //ds >> action.;
+    return ds;
+}
+
+QDataStream &operator<<(QDataStream &ds, const AppliesToObject &action)
+{
+    Q_UNUSED(action);
+    ds << action.objectName;
+    return ds;
+}
+
+QDataStream &operator>>(QDataStream &ds, AppliesToObject &action)
+{
+    Q_UNUSED(action);
+    ds >> action.objectName;
+    return ds;
+}
+
 QDataStream &operator<<(QDataStream &ds, const MoveFixedAction &action)
 {
     Q_UNUSED(action);
-//   ds << action.;
+    ds << action.appliesTo;
     return ds;
 }
 
 QDataStream &operator>>(QDataStream &ds, MoveFixedAction &action)
 {
     Q_UNUSED(action);
-//    ds >> action.;
+    ds >> action.appliesTo;
     return ds;
 }
 
 QDataStream &operator<<(QDataStream &ds, const MoveFreeAction &action)
 {
     Q_UNUSED(action);
-//   ds << action.;
+    ds << action.appliesTo;
     return ds;
 }
 
 QDataStream &operator>>(QDataStream &ds, MoveFreeAction &action)
 {
     Q_UNUSED(action);
-//    ds >> action.;
+    ds >> action.appliesTo;
     return ds;
 }
 
 QDataStream &operator<<(QDataStream &ds, const MoveTowardsAction &action)
 {
     Q_UNUSED(action);
-//   ds << action.;
+    ds << action.appliesTo;
     return ds;
 }
 
 QDataStream &operator>>(QDataStream &ds, MoveTowardsAction &action)
 {
     Q_UNUSED(action);
-//    ds >> action.;
+    ds >> action.appliesTo;
     return ds;
 }
 
 QDataStream &operator<<(QDataStream &ds, const SpeedHorizontalAction &action)
 {
     Q_UNUSED(action);
-//   ds << action.;
+    ds << action.appliesTo;
     return ds;
 }
 
 QDataStream &operator>>(QDataStream &ds, SpeedHorizontalAction &action)
 {
     Q_UNUSED(action);
-//    ds >> action.;
+    ds >> action.appliesTo;
     return ds;
 }
 
 QDataStream &operator<<(QDataStream &ds, const SpeedVerticalAction &action)
 {
     Q_UNUSED(action);
-//   ds << action.;
+    ds << action.appliesTo;
     return ds;
 }
 
 QDataStream &operator>>(QDataStream &ds, SpeedVerticalAction &action)
 {
     Q_UNUSED(action);
-//    ds >> action.;
+    ds >> action.appliesTo;
+    return ds;
+}
+
+QDataStream &operator<<(QDataStream &ds, const SetGravityAction &action)
+{
+    Q_UNUSED(action);
+    ds << action.appliesTo;
+    return ds;
+}
+
+QDataStream &operator>>(QDataStream &ds, SetGravityAction &action)
+{
+    Q_UNUSED(action);
+    ds >> action.appliesTo;
     return ds;
 }
 
 QDataStream &operator<<(QDataStream &ds, const ExecuteCodeAction &action)
 {
-    ds << action.script;
-    ds << action.appliesTo;
+    ds << action.appliesTo
+       << action.script;
     return ds;
 }
 
 QDataStream &operator>>(QDataStream &ds, ExecuteCodeAction &action)
 {
-    ds >> action.script;
-    ds >> action.appliesTo;
+    ds >> action.appliesTo
+       >> action.script;
     return ds;
 }
 
diff --git a/src/projectserialization.h b/src/projectserialization.h
index acd1a57..08f4389 100644
--- a/src/projectserialization.h
+++ b/src/projectserialization.h
@@ -28,6 +28,12 @@ QDataStream &operator<<(QDataStream &ds, const Script &script);
 QDataStream &operator>>(QDataStream &ds, Script &script);
 QDataStream &operator<<(QDataStream &ds, const Font &font);
 QDataStream &operator>>(QDataStream &ds, Font &font);
+QDataStream &operator<<(QDataStream &ds, const AppliesToSelf &action);
+QDataStream &operator>>(QDataStream &ds, AppliesToSelf &action);
+QDataStream &operator<<(QDataStream &ds, const AppliesToOther &action);
+QDataStream &operator>>(QDataStream &ds, AppliesToOther &action);
+QDataStream &operator<<(QDataStream &ds, const AppliesToObject &action);
+QDataStream &operator>>(QDataStream &ds, AppliesToObject &action);
 QDataStream &operator<<(QDataStream &ds, const MoveFixedAction &action);
 QDataStream &operator>>(QDataStream &ds, MoveFixedAction &action);
 QDataStream &operator<<(QDataStream &ds, const MoveFreeAction &action);
@@ -38,6 +44,8 @@ QDataStream &operator<<(QDataStream &ds, const SpeedHorizontalAction &action);
 QDataStream &operator>>(QDataStream &ds, SpeedHorizontalAction &action);
 QDataStream &operator<<(QDataStream &ds, const SpeedVerticalAction &action);
 QDataStream &operator>>(QDataStream &ds, SpeedVerticalAction &action);
+QDataStream &operator<<(QDataStream &ds, const SetGravityAction &action);
+QDataStream &operator>>(QDataStream &ds, SetGravityAction &action);
 QDataStream &operator<<(QDataStream &ds, const ExecuteCodeAction &action);
 QDataStream &operator>>(QDataStream &ds, ExecuteCodeAction &action);
 QDataStream &operator<<(QDataStream &ds, const TimeLine &timeLine);