ProjectExplorer: Replace project mode main window splitter by dockwidget

The main window of the project mode is already a QMainWindow,
using a dock window also for the empty space on the right makes
it consistent with the separation of the project tree on the left.

Change-Id: Ida42f267b87eb45cd1692ebcc16ded2ee6c1e523
Reviewed-by: Eike Ziller <eike.ziller@qt.io>
Reviewed-by: Cristian Adam <cristian.adam@qt.io>

src/plugins/projectexplorer/panelswidget.cpp

@@ -25,12 +25,10 @@
 
 #include "panelswidget.h"
 
-#include <coreplugin/minisplitter.h>
-
-#include <utils/stylehelper.h>
-#include <utils/theme/theme.h>
 #include <utils/qtcassert.h>
 #include <utils/styledbar.h>
+#include <utils/stylehelper.h>
+#include <utils/theme/theme.h>
 
 #include <QLabel>
 #include <QPainter>
@@ -55,18 +53,14 @@ const int PANEL_LEFT_MARGIN = 70;
 // PanelsWidget
 ///
 
-PanelsWidget::PanelsWidget(QWidget *parent)
-    : QWidget(parent), m_splitter(new Core::MiniSplitter(this))
+PanelsWidget::PanelsWidget(QWidget *parent) : QWidget(parent)
 {
     m_root = new QWidget(nullptr);
     m_root->setFocusPolicy(Qt::NoFocus);
     m_root->setContentsMargins(0, 0, 40, 0);
-    m_splitter->addWidget(m_root);
-    m_splitter->addWidget(new QWidget);
-    m_splitter->setStretchFactor(1, 100); // Force root widget to its minimum size initially
 
     const auto scroller = new QScrollArea(this);
-    scroller->setWidget(m_splitter);
+    scroller->setWidget(m_root);
     scroller->setFrameStyle(QFrame::NoFrame);
     scroller->setWidgetResizable(true);
     scroller->setFocusPolicy(Qt::NoFocus);
@@ -153,14 +147,4 @@ void PanelsWidget::addPropertiesPanel(const QString &displayName, const QIcon &i
     m_layout->addWidget(widget, widgetRow, 0, 1, 2);
 }
 
-QByteArray PanelsWidget::saveSplitterState() const
-{
-    return m_splitter->saveState().toHex();
-}
-
-void PanelsWidget::loadSplitterState(const QByteArray &state)
-{
-    m_splitter->restoreState(QByteArray::fromHex(state));
-}
-
 } // ProjectExplorer

src/plugins/projectexplorer/panelswidget.h

@@ -34,8 +34,6 @@ class QGridLayout;
 class QIcon;
 QT_END_NAMESPACE
 
-namespace Core { class MiniSplitter; }
-
 namespace ProjectExplorer {
 
 class PROJECTEXPLORER_EXPORT PanelsWidget : public QWidget
@@ -51,12 +49,8 @@ public:
     void addPropertiesPanel(const QString &displayName, const QIcon &icon,
                             QWidget *widget);
 
-    QByteArray saveSplitterState() const;
-    void loadSplitterState(const QByteArray &state);
-
 private:
     QGridLayout *m_layout;
-    Core::MiniSplitter * const m_splitter;
     QWidget *m_root;
 };
 

src/plugins/projectexplorer/projectwindow.cpp

@@ -653,6 +653,19 @@ ProjectWindow::ProjectWindow()
 {
     setBackgroundRole(QPalette::Base);
 
+    // The empty space on the right side of the project mode window.
+    auto rightSpace = new QWidget;
+    rightSpace->setAutoFillBackground(true);
+    rightSpace->setObjectName("ProjectModeRightSpace"); // Needed for dock widget state saving
+    rightSpace->setWindowTitle("dummy");
+
+    auto rightSpaceLayout = new QVBoxLayout(rightSpace);
+    rightSpaceLayout->setContentsMargins(0, 0, 0, 0);
+    rightSpaceLayout->addWidget(new StyledBar(rightSpace)); // The black blob on top
+    rightSpaceLayout->addStretch();
+
+    addDockWidget(Qt::RightDockWidgetArea, addDockForWidget(rightSpace, true));
+
     // Request custom context menu but do not provide any to avoid
     // the creation of the dock window selection menu.
     setContextMenuPolicy(Qt::CustomContextMenu);

src/plugins/projectexplorer/targetsettingspanel.cpp

@@ -612,32 +612,13 @@ public:
     QWidget *panel() const
     {
         if (!m_panel) {
-            QString splitterStateKey = "PanelSplitterState:"
-                    + m_project->projectFilePath().toString() + ':';
-            if (m_subIndex == RunPage) {
-                splitterStateKey += "Run";
-                m_panel = new PanelsWidget(RunSettingsWidget::tr("Run Settings"),
-                                           QIcon(":/projectexplorer/images/RunSettings.png"),
-                                           new RunSettingsWidget(target()));
-            } else {
-                splitterStateKey += "Build";
-                m_panel = new PanelsWidget(QCoreApplication::translate("BuildSettingsPanel", "Build Settings"),
-                                           QIcon(":/projectexplorer/images/BuildSettings.png"),
-                                           new BuildSettingsWidget(target()));
-            }
-            const auto panel = qobject_cast<PanelsWidget *>(m_panel.data());
-            const auto loadSplitterValue = [panel, splitterStateKey] {
-                const QByteArray splitterState = SessionManager::value(splitterStateKey).toByteArray();
-                if (!splitterState.isEmpty())
-                    panel->loadSplitterState(splitterState);
-            };
-            loadSplitterValue();
-            QObject::connect(SessionManager::instance(), &SessionManager::aboutToSaveSession,
-                             panel, [panel, splitterStateKey] {
-                SessionManager::setValue(splitterStateKey, panel->saveSplitterState());
-            });
-            QObject::connect(SessionManager::instance(), &SessionManager::sessionLoaded,
-                             panel, loadSplitterValue);
+            m_panel = (m_subIndex == RunPage)
+                    ? new PanelsWidget(RunSettingsWidget::tr("Run Settings"),
+                                       QIcon(":/projectexplorer/images/RunSettings.png"),
+                                       new RunSettingsWidget(target()))
+                    : new PanelsWidget(QCoreApplication::translate("BuildSettingsPanel", "Build Settings"),
+                                       QIcon(":/projectexplorer/images/BuildSettings.png"),
+                                       new BuildSettingsWidget(target()));
         }
         return m_panel;
     }