added animation to NotebookPageDropPreview

notebookpage.cpp

@@ -175,8 +175,10 @@ NotebookPage::setPreviewRect(QPoint mousePos)
 {
     for (DropRegion region : m_dropRegions) {
         if (region.rect.contains(mousePos)) {
-            m_preview.move(region.rect.x(), region.rect.y());
+            m_preview.setBounds(region.rect);
-            m_preview.resize(region.rect.width(), region.rect.height());
+            //            m_preview.move(region.rect.x(), region.rect.y());
+            //            m_preview.resize(region.rect.width(),
+            //            region.rect.height());
             m_preview.show();
             m_preview.raise();
 

notebookpagedroppreview.cpp

@@ -4,6 +4,8 @@
 
 NotebookPageDropPreview::NotebookPageDropPreview(QWidget *parent)
     : QWidget(parent)
+    , m_positionAnimation(this, "geometry")
+    , m_desiredGeometry()
 {
     setHidden(true);
 }
@@ -16,3 +18,19 @@ NotebookPageDropPreview::paintEvent(QPaintEvent *)
     painter.fillRect(8, 8, width() - 17, height() - 17,
                      ColorScheme::instance().DropPreviewBackground);
 }
+
+void
+NotebookPageDropPreview::setBounds(const QRect &rect)
+{
+    if (rect == m_desiredGeometry) {
+        return;
+    }
+
+    m_positionAnimation.stop();
+    m_positionAnimation.setDuration(50);
+    m_positionAnimation.setStartValue(geometry());
+    m_positionAnimation.setEndValue(rect);
+    m_positionAnimation.start();
+
+    m_desiredGeometry = rect;
+}

notebookpagedroppreview.h

@@ -1,6 +1,7 @@
 #ifndef NOTEBOOKPAGEDROPPREVIEW_H
 #define NOTEBOOKPAGEDROPPREVIEW_H
 
+#include <QPropertyAnimation>
 #include <QWidget>
 
 class NotebookPageDropPreview : public QWidget
@@ -8,8 +9,13 @@ class NotebookPageDropPreview : public QWidget
 public:
     NotebookPageDropPreview(QWidget *parent);
 
+    void setBounds(const QRect &rect);
+
 protected:
     void paintEvent(QPaintEvent *);
+
+    QPropertyAnimation m_positionAnimation;
+    QRect m_desiredGeometry;
 };
 
 #endif  // NOTEBOOKPAGEDROPPREVIEW_H