implement icon menu zoom effect

components/flatbutton.cpp

@@ -3,13 +3,14 @@
 #include <QMouseEvent>
 #include <QApplication>
 #include "flatbutton.h"
-#include "style.h"
+#include "lib/style.h"
 
 FlatButton::FlatButton(QWidget *parent)
     : QAbstractButton(parent),
       _overlay(new RippleOverlay(this))
 {
     setStyle(&Style::instance());
+    setAttribute(Qt::WA_Hover);
 }
 
 FlatButton::FlatButton(const QString &text, QWidget *parent)
@@ -18,6 +19,7 @@ FlatButton::FlatButton(const QString &text, QWidget *parent)
 {
     setText(text);
     setStyle(&Style::instance());
+    setAttribute(Qt::WA_Hover);
 }
 
 FlatButton::~FlatButton()

components/iconmenu.cpp

@@ -5,6 +5,7 @@
 #include <QPainter>
 #include "iconmenu.h"
 #include "menu.h"
+#include "lib/scaleeffect.h"
 
 MenuOverlay::MenuOverlay(QWidget *parent)
     : QWidget(parent)
@@ -22,19 +23,23 @@ IconMenu::IconMenu(const QIcon &icon, QWidget *parent)
       _menuOverlay(new MenuOverlay),
       _menu(new Menu(_menuOverlay)),
       _animation(new QPropertyAnimation(this)),
+      _effect(new ScaleEffect(this)),
       _menuVisible(false),
-      _progress(0)
+      _progress(1)
 {
     setCheckable(true);
     setOverlayParent(parent);
 
     _animation->setPropertyName("progress");
     _animation->setTargetObject(this);
-    _animation->setDuration(350);
+    _animation->setDuration(200);
     _animation->setStartValue(1);
     _animation->setEndValue(0);
 
+    _animation->setEasingCurve(QEasingCurve::InOutCubic);
+
     _menu->hide();
+    _menu->setGraphicsEffect(_effect);
 
     _menuOverlay->installEventFilter(this);
 
@@ -57,6 +62,8 @@ void IconMenu::setProgress(qreal progress)
         return;
     _progress = progress;
 
+    _effect->setScale(0.5*(1 + progress), progress);
+
     emit progressChanged(progress);
     update();
 }

components/iconmenu.h

@@ -15,6 +15,7 @@ public:
 };
 
 class QPropertyAnimation;
+class ScaleEffect;
 class Menu;
 
 class IconMenu : public IconButton
@@ -49,6 +50,7 @@ private:
     MenuOverlay        *const _menuOverlay;
     Menu               *const _menu;
     QPropertyAnimation *const _animation;
+    ScaleEffect        *const _effect;
     QPoint                    _menuPos;
     bool                      _menuVisible;
     qreal                     _progress;

lib/scaleeffect.cpp

@@ -0,0 +1,38 @@
+#include <QPainter>
+#include "scaleeffect.h"
+
+ScaleEffect::ScaleEffect(QObject *parent)
+    : QGraphicsEffect(parent),
+      _scaleX(1),
+      _scaleY(1)
+{
+}
+
+void ScaleEffect::setScale(qreal x, qreal y)
+{
+    _scaleX = x;
+    _scaleY = y;
+    updateBoundingRect();
+}
+
+QSizeF ScaleEffect::scale() const
+{
+    return QSizeF(_scaleX, _scaleY);
+}
+
+void ScaleEffect::draw(QPainter *painter)
+{
+    QPoint offset;
+    const QPixmap pixmap = sourcePixmap(
+                Qt::DeviceCoordinates,
+                &offset,
+                QGraphicsEffect::PadToEffectiveBoundingRect);
+
+    const QSize &size = pixmap.size();
+    painter->setWorldTransform(QTransform());
+    painter->drawPixmap(offset, pixmap.scaled(
+                            size.width()*_scaleX,
+                            size.height()*_scaleY,
+                            Qt::IgnoreAspectRatio,
+                            Qt::SmoothTransformation));
+}

lib/scaleeffect.h

@@ -0,0 +1,25 @@
+#ifndef SCALEEFFECT_H
+#define SCALEEFFECT_H
+
+#include <QGraphicsEffect>
+
+class ScaleEffect : public QGraphicsEffect
+{
+    Q_OBJECT
+
+public:
+    explicit ScaleEffect(QObject *parent = 0);
+
+    void setScale(qreal x, qreal y);
+    QSizeF scale() const;
+    inline qreal scaleX() const { return _scaleX; }
+    inline qreal scaleY() const { return _scaleY; }
+
+    void draw(QPainter *painter);
+
+private:
+    qreal _scaleX;
+    qreal _scaleY;
+};
+
+#endif // SCALEEFFECT_H

qt-material-widgets.pro

@@ -50,7 +50,8 @@ SOURCES += main.cpp\
     components/menu.cpp \
     components/scrollbar.cpp \
     lib/style.cpp \
-    examples/iconmenuexamples.cpp
+    examples/iconmenuexamples.cpp \
+    lib/scaleeffect.cpp
 
 HEADERS  += mainwindow.h \
     style.h \
@@ -94,4 +95,5 @@ HEADERS  += mainwindow.h \
     components/menu.h \
     components/scrollbar.h \
     lib/style.h \
-    examples/iconmenuexamples.h
+    examples/iconmenuexamples.h \
+    lib/scaleeffect.h