EffectMaker: Add clear all nodes button

Fixes: QDS-11335
Change-Id: I5d0e0e11baabe780c19234410814a9f6eb45130d
Reviewed-by: Mahmoud Badri <mahmoud.badri@qt.io>

share/qtcreator/qmldesigner/effectMakerQmlSources/EffectMaker.qml

@@ -55,6 +55,21 @@ Item {
                 mainRoot: root
 
                 anchors.verticalCenter: parent.verticalCenter
+                x: 5
+                width: parent.width - 50
+            }
+
+            HelperWidgets.AbstractButton {
+                anchors.right: parent.right
+                anchors.rightMargin: 5
+                anchors.verticalCenter: parent.verticalCenter
+
+                style: StudioTheme.Values.viewBarButtonStyle
+                buttonIcon: StudioTheme.Constants.clearList_medium
+                tooltip: qsTr("Remove all effect nodes.")
+                enabled: !EffectMakerBackend.effectMakerModel.isEmpty
+
+                onClicked: EffectMakerBackend.effectMakerModel.removeAllNodes()
             }
 
             HelperWidgets.AbstractButton {
@@ -64,7 +79,7 @@ Item {
 
                 style: StudioTheme.Values.viewBarButtonStyle
                 buttonIcon: StudioTheme.Constants.code
-                tooltip: qsTr("Open Shader in Code Editor")
+                tooltip: qsTr("Open Shader in Code Editor.")
                 visible: false // TODO: to be implemented
 
                 onClicked: {} // TODO

share/qtcreator/qmldesigner/effectMakerQmlSources/EffectNodesComboBox.qml

@@ -12,8 +12,6 @@ StudioControls.ComboBox {
     id: root
 
     actionIndicatorVisible: false
-    x: 5
-    width: parent.width - 50
 
     model: [qsTr("+ Add Effect")]
 

src/plugins/effectmakernew/effectmakermodel.cpp

@@ -129,8 +129,7 @@ void EffectMakerModel::moveNode(int fromIdx, int toIdx)
 void EffectMakerModel::removeNode(int idx)
 {
     beginRemoveRows({}, idx, idx);
-    CompositionNode *node = m_nodes.at(idx);
-    m_nodes.removeAt(idx);
+    CompositionNode *node = m_nodes.takeAt(idx);
     delete node;
     endRemoveRows();
 
@@ -140,6 +139,16 @@ void EffectMakerModel::removeNode(int idx)
         bakeShaders();
 }
 
+void EffectMakerModel::removeAllNodes()
+{
+    beginResetModel();
+    qDeleteAll(m_nodes);
+    m_nodes.clear();
+    endResetModel();
+
+    setIsEmpty(true);
+}
+
 QString EffectMakerModel::fragmentShader() const
 {
     return m_fragmentShader;

src/plugins/effectmakernew/effectmakermodel.h

@@ -63,6 +63,7 @@ public:
 
     Q_INVOKABLE void moveNode(int fromIdx, int toIdx);
     Q_INVOKABLE void removeNode(int idx);
+    Q_INVOKABLE void removeAllNodes();
 
     bool shadersUpToDate() const;
     void setShadersUpToDate(bool newShadersUpToDate);