QmlDesigner: Do only clean image cache if the target changed

Task-number: QDS-3388
Change-Id: I159f70b2bc2f874203392befea566e4c52de7347
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>

src/plugins/qmldesigner/components/itemlibrary/itemlibraryview.cpp

@@ -39,6 +39,8 @@
 #include <importmanagerview.h>
 #include <nodelistproperty.h>
 #include <projectexplorer/kit.h>
+#include <projectexplorer/project.h>
+#include <projectexplorer/session.h>
 #include <projectexplorer/target.h>
 #include <rewriterview.h>
 #include <sqlitedatabase.h>
@@ -49,6 +51,16 @@
 
 namespace QmlDesigner {
 
+namespace {
+ProjectExplorer::Target *activeTarget(ProjectExplorer::Project *project)
+{
+    if (project)
+        return project->activeTarget();
+
+    return {};
+}
+} // namespace
+
 class ImageCacheData
 {
 public:
@@ -72,9 +84,32 @@ ItemLibraryView::ItemLibraryView(QObject* parent)
 
 {
     m_imageCacheData = std::make_unique<ImageCacheData>();
+
+    auto setTargetInImageCache =
+        [imageCacheData = m_imageCacheData.get()](ProjectExplorer::Target *target) {
+            if (target == imageCacheData->collector.target())
+                return;
+
+            if (target)
+                imageCacheData->cache.clean();
+
+            imageCacheData->collector.setTarget(target);
+        };
+
+    if (auto project = ProjectExplorer::SessionManager::startupProject(); project) {
+        m_imageCacheData->collector.setTarget(project->activeTarget());
+        connect(project, &ProjectExplorer::Project::activeTargetChanged, this, setTargetInImageCache);
+    }
+
+    connect(ProjectExplorer::SessionManager::instance(),
+            &ProjectExplorer::SessionManager::startupProjectChanged,
+            this,
+            [=](ProjectExplorer::Project *project) { setTargetInImageCache(activeTarget(project)); });
 }
 
-ItemLibraryView::~ItemLibraryView() = default;
+ItemLibraryView::~ItemLibraryView()
+{
+}
 
 bool ItemLibraryView::hasWidget() const
 {
@@ -101,11 +136,6 @@ WidgetInfo ItemLibraryView::widgetInfo()
 void ItemLibraryView::modelAttached(Model *model)
 {
     AbstractView::modelAttached(model);
-    auto target = QmlDesignerPlugin::instance()->currentDesignDocument()->currentTarget();
-    m_imageCacheData->cache.clean();
-
-    if (target)
-        m_imageCacheData->collector.setTarget(target);
 
     m_widget->clearSearchFilter();
     m_widget->setModel(model);
@@ -120,8 +150,6 @@ void ItemLibraryView::modelAboutToBeDetached(Model *model)
 {
     model->detachView(m_importManagerView);
 
-    m_imageCacheData->collector.setTarget({});
-
     AbstractView::modelAboutToBeDetached(model);
 
     m_widget->setModel(nullptr);

src/plugins/qmldesigner/components/itemlibrary/itemlibrarywidget.cpp

@@ -268,6 +268,9 @@ ItemLibraryWidget::ItemLibraryWidget(AsynchronousImageCache &imageCache,
     connect(dropSupport, &Utils::DropSupport::filesDropped,
             this, &ItemLibraryWidget::importDroppedFiles);
 
+    m_itemViewQuickWidget->engine()->addImageProvider("itemlibrary_preview",
+                                                      new ItemLibraryIconImageProvider{m_imageCache});
+
     // init the first load of the QML UI elements
     reloadQmlSource();
 }
@@ -337,14 +340,10 @@ void ItemLibraryWidget::delayedUpdateModel()
 
 void ItemLibraryWidget::setModel(Model *model)
 {
-    m_itemViewQuickWidget->engine()->removeImageProvider("itemlibrary_preview");
     m_model = model;
     if (!model)
         return;
 
-    m_itemViewQuickWidget->engine()->addImageProvider("itemlibrary_preview",
-                                                      new ItemLibraryIconImageProvider{m_imageCache});
-
     setItemLibraryInfo(model->metaInfo().itemLibraryInfo());
 }
 

src/plugins/qmldesigner/designercore/imagecache/imagecachecollector.cpp

@@ -153,4 +153,9 @@ void ImageCacheCollector::setTarget(ProjectExplorer::Target *target)
     m_target = target;
 }
 
+ProjectExplorer::Target *ImageCacheCollector::target() const
+{
+    return m_target;
+}
+
 } // namespace QmlDesigner

src/plugins/qmldesigner/designercore/imagecache/imagecachecollector.h

@@ -67,6 +67,7 @@ public:
                      const ImageCache::AuxiliaryData &auxiliaryData) override;
 
     void setTarget(ProjectExplorer::Target *target);
+    ProjectExplorer::Target *target() const;
 
 private:
     ImageCacheConnectionManager &m_connectionManager;