QmlDesigner: Enable drag & drop in EffectComposer image fields

Fixes: QDS-13574
Change-Id: I2c5727f48306140f5d26ea21de51322b833b5c4b
Reviewed-by: Marco Bubke <marco.bubke@qt.io>
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@qt.io>
Reviewed-by: Mahmoud Badri <mahmoud.badri@qt.io>

src/plugins/effectcomposer/effectcomposerview.cpp

@@ -6,6 +6,7 @@
 #include "effectcomposermodel.h"
 #include "effectcomposernodesmodel.h"
 #include "effectcomposerwidget.h"
+#include "studioquickwidget.h"
 
 #include <designermcumanager.h>
 #include <documentmanager.h>
@@ -234,4 +235,27 @@ void EffectComposerView::removeUnusedEffectImports()
     }
 }
 
+void EffectComposerView::highlightSupportedProperties(bool highlight, const QString &suffix)
+{
+    QQmlContext *ctxObj = m_widget->quickWidget()->rootContext();
+    ctxObj->setContextProperty("activeDragSuffix", suffix);
+    ctxObj->setContextProperty("hasActiveDrag", highlight);
+}
+
+void EffectComposerView::dragStarted(QMimeData *mimeData)
+{
+    if (mimeData->hasFormat(QmlDesigner::Constants::MIME_TYPE_ASSETS)) {
+        QString format = mimeData->formats()[0];
+        const QString assetPath = QString::fromUtf8(mimeData->data(format)).split(',')[0];
+        const QString suffix = "*." + assetPath.split('.').last().toLower();
+
+        highlightSupportedProperties(true, suffix);
+    }
+}
+
+void EffectComposerView::dragEnded()
+{
+    highlightSupportedProperties(false);
+}
+
 } // namespace EffectComposer

src/plugins/effectcomposer/effectcomposerview.h

@@ -41,6 +41,11 @@ public:
                               const QList<QmlDesigner::ModelNode> &lastSelectedNodeList) override;
     void nodeAboutToBeRemoved(const QmlDesigner::ModelNode &removedNode) override;
 
+    void dragStarted(QMimeData *mimeData) override;
+    void dragEnded() override;
+
+    void highlightSupportedProperties(bool highlight, const QString &suffix = {});
+
 private:
     void customNotification(const AbstractView *view, const QString &identifier,
                             const QList<QmlDesigner::ModelNode> &nodeList, const QList<QVariant> &data) override;

src/plugins/effectcomposer/uniform.cpp

@@ -57,6 +57,14 @@ Uniform::Uniform(const QString &effectName, const QJsonObject &propObj, const QS
 
     m_backendValue = new QmlDesigner::PropertyEditorValue(this);
     m_backendValue->setValue(value);
+
+    connect(m_backendValue, &QmlDesigner::PropertyEditorValue::dropCommitted,
+        this, [this](const QString &dropData) {
+            m_backendValue->setValue(dropData);
+            auto *model = QmlDesigner::QmlDesignerPlugin::instance()
+                              ->currentDesignDocument()->currentModel();
+            model->endDrag();
+        });
 }
 
 Uniform::Type Uniform::type() const

src/plugins/qmldesigner/components/propertyeditor/propertyeditorvalue.cpp

@@ -530,7 +530,12 @@ void PropertyEditorValue::commitDrop(const QString &dropData)
         });
     }
 
-    m_modelNode.view()->model()->endDrag();
+    emit dropCommitted(dropData);
+
+    if (!m_modelNode.model())
+        return;
+
+    m_modelNode.model()->endDrag();
 }
 
 void PropertyEditorValue::openMaterialEditor(int idx)

src/plugins/qmldesigner/components/propertyeditor/propertyeditorvalue.h

@@ -200,6 +200,7 @@ signals:
     void isValidChanged();
     void isExplicitChanged();
     void hasActiveDragChanged();
+    void dropCommitted(QString dropData);
 
 private:
     QStringList generateStringList(const QString &string) const;

src/plugins/qmldesigner/libs/designercore/model/model.cpp

@@ -1948,6 +1948,9 @@ void Model::startDrag(std::unique_ptr<QMimeData> mimeData, const QPixmap &icon,
 
 void Model::endDrag()
 {
+    if (!d->drag)
+        return;
+
     d->notifyDragEnded();
     d->drag.reset();
 }