make sure a transparent window

src/declarativeimports/core/dialog.cpp

@@ -99,12 +99,17 @@ DialogProxy::DialogProxy(QQuickItem *parent)
       m_activeWindow(false),
       m_location(Plasma::Floating)
 {
+    QSurfaceFormat format;
+    format.setAlphaBufferSize(8);
+    setFormat(format);
+    setClearBeforeRendering(true);
+    setColor(QColor(Qt::transparent));
+    setFlags(Qt::FramelessWindowHint);
+
     //m_dialog = new QQuickWindow();
     m_margins = new DialogMargins(m_dialog, this);
     //m_dialog->installEventFilter(this);
     m_flags = flags();
-    setWindowFlags(Qt::FramelessWindowHint);
-    setColor(Qt::transparent);
 }
 
 DialogProxy::~DialogProxy()
@@ -412,6 +417,18 @@ QObject *DialogProxy::margins() const
     return m_margins;
 }
 
+void DialogProxy::resizeEvent(QResizeEvent *re)
+{
+    if (contentItem()) {
+        contentItem()->setWidth(re->size().width());
+        contentItem()->setHeight(re->size().height());
+    }
+    if (m_mainItem) {
+        m_mainItem.data()->setWidth(re->size().width());
+        m_mainItem.data()->setHeight(re->size().height());
+    }
+}
+
 bool DialogProxy::eventFilter(QObject *watched, QEvent *event)
 {
     if (watched == this && event->type() == QEvent::Move) {

src/declarativeimports/core/dialog.h

@@ -230,6 +230,7 @@ protected Q_SLOTS:
 
 protected:
     bool eventFilter(QObject *watched, QEvent *event);
+    void resizeEvent(QResizeEvent *re);
 
 private:
     QQuickWindow *m_dialog;

src/shell/qmlpackages/desktop/contents/ui/CompactApplet.qml

@@ -36,20 +36,25 @@ Item {
     }
 
 
-    Window {
+    PlasmaCore.Dialog {
         id: popupWindow
+        //windowFlags: Qt.Popup
+        color: Qt.rgba(0,0,0,0)
         visible: plasmoid.expanded
         onVisibleChanged: {
             if (!visible) {
                 plasmoid.expanded = false
             }
         }
-        width: 200
-        height: 200
-        Item {
+        onWidthChanged: appletParent.width = width
+        onHeightChanged:appletParent.height = height
+        mainItem: appletParent
+        Rectangle {
             id: appletParent
-            width: applet.implicitWidth
-            height: applet.implicitHeight
+            width: 200//applet.implicitWidth
+            height: 200//applet.implicitHeight
+            onWidthChanged: applet.width = width
+            onHeightChanged: applet.height = height
         }
     }
 }