Viewport: Implemented on-canvas drag

[pulseview.git] / pv / view / viewwidget.hpp

diff --git a/pv/view/viewwidget.hpp b/pv/view/viewwidget.hpp
index fc7247627a8783f1a55bf81dc31526da151c8032..6fd1ecefd1f853a2403fc880cacb36c1c699a108 100644 (file)
--- a/pv/view/viewwidget.hpp
+++ b/pv/view/viewwidget.hpp
@@ -25,6 +25,8 @@
 
 #include <QWidget>
 
+class QTouchEvent;
+
 namespace pv {
 namespace view {
 
@@ -52,12 +54,34 @@ protected:
         */
        bool accept_drag() const;
 
+       /**
+        * Returns true if the mouse button is down.
+        */
+       bool mouse_down() const;
+
        /**
         * Drag the dragging items by the delta offset.
         * @param delta the drag offset in pixels.
         */
        void drag_items(const QPoint &delta);
 
+       /**
+        * Sets this item into the dragged state.
+        */
+       virtual void drag();
+
+       /**
+        * Drag the background by the delta offset.
+        * @param delta the drag offset in pixels.
+        * @remarks The default implementation does nothing.
+        */
+       virtual void drag_by(const QPoint &delta);
+
+       /**
+        * Sets this item into the un-dragged state.
+        */
+       virtual void drag_release();
+
        /**
         * Gets the items in the view widget.
         */
@@ -84,7 +108,15 @@ protected:
         */
        void mouse_left_release_event(QMouseEvent *event);
 
+       /**
+        * Handles touch begin update and end events.
+        * @param e the event that triggered this handler.
+        */
+       virtual bool touch_event(QTouchEvent *e);
+
 protected:
+       bool event(QEvent *event);
+
        void mousePressEvent(QMouseEvent * event);
        void mouseReleaseEvent(QMouseEvent *event);
        void mouseMoveEvent(QMouseEvent *event);
@@ -102,7 +134,7 @@ protected:
        QPoint mouse_point_;
        QPoint mouse_down_point_;
        std::shared_ptr<ViewItem> mouse_down_item_;
-       bool dragging_;
+       bool item_dragging_;
 };
 
 } // namespace view