subwindows: Allow fading out

Resolves #10

skins/fluent2/QskFluent2Skin.cpp

@@ -1877,6 +1877,8 @@ void Editor::setupSubWindow( const QskFluent2Theme& theme )
     using Q = QskSubWindow;
     const auto& pal = theme.palette;
 
+    setAnimation( Q::Panel | QskAspect::Position, 150 );
+
     setPadding( Q::Panel, { 0, 31, 0, 0 } );
     setBoxShape( Q::Panel, 7 );
     setBoxBorderMetrics( Q::Panel, 1 );

skins/material3/QskMaterial3Skin.cpp

@@ -1236,6 +1236,8 @@ void Editor::setupSubWindow()
     using A = QskAspect;
     using Q = QskSubWindow;
 
+    setAnimation( Q::Panel | QskAspect::Position, 150 );
+
     // Panel
 
     setPadding( Q::Panel, { 24_dp, 0, 24_dp, 24_dp } );

src/controls/QskPopup.cpp

@@ -4,6 +4,7 @@
  *****************************************************************************/
 
 #include "QskPopup.h"
+#include "QskAnimationHint.h"
 #include "QskAspect.h"
 #include "QskInputGrabber.h"
 #include "QskQuick.h"
@@ -638,8 +639,23 @@ int QskPopup::execPopup()
              */
 
             connect( popup, &QObject::destroyed, this, &EventLoop::reject );
-            connect( popup, &QskPopup::fadingChanged, this, &EventLoop::maybeQuit );
+
-            connect( popup, &QskPopup::openChanged, this, &EventLoop::maybeQuit );
+            connect( popup, &QskPopup::fadingChanged, this, [this, popup]()
+            {
+                if ( !popup->isOpen() && !popup->isFading() )
+                {
+                    QEventLoop::exit( 0 );
+                }
+            });
+
+            connect( popup, &QskPopup::openChanged, this, [this, popup]()
+            {
+                if( popup->faderAspect().value() == 0
+                    || popup->animationHint( popup->faderAspect().subControl() | QskAspect::Position ).duration <= 0 )
+                {
+                    QEventLoop::exit( 0 );
+                } // otherwise wait for the fading to finish
+            });
         }
 
       private:
@@ -648,17 +664,6 @@ int QskPopup::execPopup()
             setParent( nullptr );
             QEventLoop::exit( 1 );
         }
-
-        void maybeQuit()
-        {
-            if ( auto popup = qobject_cast< const QskPopup* >( parent() ) )
-            {
-                if ( popup->isOpen() || popup->isFading() )
-                    return;
-            }
-
-            QEventLoop::exit( 0 );
-        }
     };
 
     if ( isOpen() || isFading() )

src/controls/QskSubWindow.cpp

@@ -4,6 +4,7 @@
  *****************************************************************************/
 
 #include "QskSubWindow.h"
+#include "QskAnimationHint.h"
 #include "QskAspect.h"
 #include "QskPlatform.h"
 #include "QskGraphic.h"
@@ -49,7 +50,15 @@ QskSubWindow::QskSubWindow( QQuickItem* parent )
     setMargins( 0 );
     initSizePolicy( QskSizePolicy::MinimumExpanding, QskSizePolicy::MinimumExpanding );
 
+    setFaderAspect( Panel | QskAspect::Metric );
+
     setAutoLayoutChildren( true );
+
+    connect(this, &QskSubWindow::closed, this, [this]() {
+        startTransition( Panel | QskAspect::Metric,
+            animationHint( Panel | QskAspect::Position ),
+            0.0, 1.0 );
+    });
 }
 
 QskSubWindow::~QskSubWindow()
@@ -189,6 +198,12 @@ bool QskSubWindow::event( QEvent* event )
 
 void QskSubWindow::updateLayout()
 {
+    if( isFading() )
+    {
+        const auto opacity = 1 - metric( faderAspect() );
+        setOpacity( opacity );
+    }
+
     if ( m_data->isWindowIconSourceDirty )
     {
         if ( !m_data->windowIconSource.isEmpty() )