Improve Touch support

With this patch dolphin now supports the following touch gestures:

* Tap gesture to interact/open with directories, files and so on
* TapAndHold and release gesture for access to the context menu (main window, panel folder, places and information)
* TapAndHold and moving gesture for drag and drop action (main windows, panel folder and places)
* pinch gesture for zoom in main window
* kinetic scrolling (QScroller) for main window, panel folder, panel places, panel information, setting preview and service
* two fingers swipe gesture to left, right and up as shortcut to navigate back, forward and up
* two finger tap gesture to toggle item selection, similar to Ctrl and left mouse click

FEATURE: 385066
FIXED-IN: 20.11.80

 You are currently rebasing branch 'touch' on '85241a924'.

1 files changed, 29 insertions, 0 deletions

diff --git a/src/kitemviews/kitemlistcontroller.h b/src/kitemviews/kitemlistcontroller.h
index a84d1b8c8..d929027b7 100644
--- a/src/kitemviews/kitemlistcontroller.h
+++ b/src/kitemviews/kitemlistcontroller.h
@@ -14,6 +14,7 @@
 
 #include <QObject>
 #include <QPointF>
+#include <QScroller>
 
 class QTimer;
 class KItemModelBase;
@@ -21,6 +22,7 @@ class KItemListKeyboardSearchManager;
 class KItemListSelectionManager;
 class KItemListView;
 class KItemListWidget;
+class QGestureEvent;
 class QGraphicsSceneHoverEvent;
 class QGraphicsSceneDragDropEvent;
 class QGraphicsSceneMouseEvent;
@@ -28,6 +30,7 @@ class QGraphicsSceneResizeEvent;
 class QGraphicsSceneWheelEvent;
 class QInputMethodEvent;
 class QKeyEvent;
+class QTapGesture;
 class QTransform;
 
 /**
@@ -208,6 +211,14 @@ signals:
 
     void selectedItemTextPressed(int index);
 
+    void scrollerStop();
+    void increaseZoom();
+    void decreaseZoom();
+    void swipeUp();
+
+public slots:
+    void slotStateChanged(QScroller::State newState);
+
 private slots:
     void slotViewScrollOffsetChanged(qreal current, qreal previous);
 
@@ -289,11 +300,25 @@ private:
     bool hoverLeaveEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform);
     bool wheelEvent(QGraphicsSceneWheelEvent* event, const QTransform& transform);
     bool resizeEvent(QGraphicsSceneResizeEvent* event, const QTransform& transform);
+    bool gestureEvent(QGestureEvent* event, const QTransform& transform);
+    void tapTriggered(QTapGesture* tap, const QTransform& transform);
+    void tapAndHoldTriggered(QGestureEvent* event, const QTransform& transform);
+    void pinchTriggered(QGestureEvent* event, const QTransform& transform);
+    void swipeTriggered(QGestureEvent* event, const QTransform& transform);
+    void twoFingerTapTriggered(QGestureEvent* event, const QTransform& transform);
+    bool onPress(const QPoint& screenPos, const QPointF& pos, const Qt::KeyboardModifiers modifiers, const Qt::MouseButtons buttons);
+    bool onRelease(const QPointF& pos, const Qt::KeyboardModifiers modifiers, const Qt::MouseButtons buttons, bool touch);
+    void startRubberBand();
 
 private:
     bool m_singleClickActivationEnforced;
     bool m_selectionTogglePressed;
     bool m_clearSelectionIfItemsAreNotDragged;
+    bool m_isSwipeGesture;
+    bool m_dragActionOrRightClick;
+    bool m_scrollerIsScrolling;
+    bool m_pinchGestureInProgress;
+    bool m_mousePress;
     SelectionBehavior m_selectionBehavior;
     AutoActivationBehavior m_autoActivationBehavior;
     MouseDoubleClickAction m_mouseDoubleClickAction;
@@ -306,6 +331,10 @@ private:
 
     QTimer* m_autoActivationTimer;
 
+    Qt::GestureType m_swipeGesture;
+    Qt::GestureType m_twoFingerTapGesture;
+    Qt::MouseEventSource m_lastSource;
+
     /**
      * When starting a rubberband selection during a Shift- or Control-key has been
      * pressed the current selection should never be deleted. To be able to restore