EffectComposer: Toggle "Assign to.." button based on component selection

Task-number: QDS-12148
Change-Id: I1f44df7c6c027c36c09f7c4d74e4dd609542c5b8
Reviewed-by: Qt CI Patch Build Bot <ci_patchbuild_bot@qt.io>
Reviewed-by: Mahmoud Badri <mahmoud.badri@qt.io>

share/qtcreator/qmldesigner/effectComposerQmlSources/EffectComposerTopBar.qml

@@ -58,7 +58,8 @@ Rectangle {
             style: StudioTheme.Values.viewBarButtonStyle
             buttonIcon: StudioTheme.Constants.assignTo_medium
             tooltip: qsTr("Assign current composition to selected item")
-            enabled: root.backendModel ? root.backendModel.isEnabled
+            enabled: root.backendModel ? root.backendModel.hasValidTarget
+                                         && root.backendModel.isEnabled
                                          && root.backendModel.currentComposition !== ""
                                        : false
 

src/plugins/effectcomposer/effectcomposermodel.cpp

@@ -1729,6 +1729,19 @@ void EffectComposerModel::setIsEnabled(bool enabled)
     emit isEnabledChanged();
 }
 
+bool EffectComposerModel::hasValidTarget() const
+{
+    return m_hasValidTarget;
+}
+
+void EffectComposerModel::setHasValidTarget(bool validTarget)
+{
+    if (m_hasValidTarget == validTarget)
+        return;
+    m_hasValidTarget = validTarget;
+    emit hasValidTargetChanged();
+}
+
 QString EffectComposerModel::getQmlImagesString(bool localFiles)
 {
     QString imagesString;

src/plugins/effectcomposer/effectcomposermodel.h

@@ -48,6 +48,7 @@ class EffectComposerModel : public QAbstractListModel
     Q_PROPERTY(bool hasUnsavedChanges MEMBER m_hasUnsavedChanges WRITE setHasUnsavedChanges NOTIFY hasUnsavedChangesChanged)
     Q_PROPERTY(bool shadersUpToDate READ shadersUpToDate WRITE setShadersUpToDate NOTIFY shadersUpToDateChanged)
     Q_PROPERTY(bool isEnabled READ isEnabled WRITE setIsEnabled NOTIFY isEnabledChanged)
+    Q_PROPERTY(bool hasValidTarget READ hasValidTarget WRITE setHasValidTarget NOTIFY hasValidTargetChanged)
     Q_PROPERTY(QString currentComposition READ currentComposition WRITE setCurrentComposition NOTIFY currentCompositionChanged)
 
 public:
@@ -77,6 +78,9 @@ public:
     bool isEnabled() const;
     void setIsEnabled(bool enabled);
 
+    bool hasValidTarget() const;
+    void setHasValidTarget(bool validTarget);
+
     QString fragmentShader() const;
     void setFragmentShader(const QString &newFragmentShader);
 
@@ -110,6 +114,7 @@ signals:
     void effectErrorChanged();
     void shadersUpToDateChanged();
     void isEnabledChanged();
+    void hasValidTargetChanged();
     void shadersBaked();
     void currentCompositionChanged();
     void nodesChanged();
@@ -210,6 +215,7 @@ private:
     QString m_qmlComponentString;
     bool m_loadComponentImages = true;
     bool m_isEnabled = true;
+    bool m_hasValidTarget = false;
     QString m_currentComposition;
     QTimer m_rebakeTimer;
 

src/plugins/effectcomposer/effectcomposerview.cpp

@@ -105,4 +105,19 @@ void EffectComposerView::modelAboutToBeDetached(QmlDesigner::Model *model)
     AbstractView::modelAboutToBeDetached(model);
 }
 
+void EffectComposerView::selectedNodesChanged(const QList<QmlDesigner::ModelNode> & selectedNodeList,
+                                              const QList<QmlDesigner::ModelNode> & /*lastSelectedNodeList*/)
+{
+    bool hasValidTarget = false;
+
+    for (const QmlDesigner::ModelNode &node : selectedNodeList) {
+        if (node.metaInfo().isQtQuickItem()) {
+            hasValidTarget = true;
+            break;
+        }
+    }
+
+    m_widget->effectComposerModel()->setHasValidTarget(hasValidTarget);
+}
+
 } // namespace EffectComposer

src/plugins/effectcomposer/effectcomposerview.h

@@ -4,6 +4,7 @@
 #pragma once
 
 #include "abstractview.h"
+#include "modelnode.h"
 
 #include <coreplugin/icontext.h>
 
@@ -35,6 +36,8 @@ public:
     // AbstractView
     void modelAttached(QmlDesigner::Model *model) override;
     void modelAboutToBeDetached(QmlDesigner::Model *model) override;
+    void selectedNodesChanged(const QList<QmlDesigner::ModelNode> &selectedNodeList,
+                              const QList<QmlDesigner::ModelNode> &lastSelectedNodeList) override;
 
 private:
     void customNotification(const AbstractView *view, const QString &identifier,