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List:       kde-commits
Subject:    kdeplayground-edu/kdissert/src/kdissert/canvasview
From:       Thomas Nagy <tnagyemail-mail () yahoo ! fr>
Date:       2005-05-02 3:00:43
Message-ID: 20050502030043.248F64A6 () office ! kde ! org
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CVS commit by tnagy: 

Fixed the scroll motion for zoom values inferior to 100%


  M +17 -5     DCanvasView.cpp   1.5
  M +7 -1      DCanvasView.h   1.3


--- kdeplayground-edu/kdissert/src/kdissert/canvasview/DCanvasView.cpp  #1.4:1.5
@@ -384,4 +384,5 @@ void DCanvasView::contentsMousePressEven
                 }
         }
+        me->ignore();
 }
 
@@ -512,9 +513,6 @@ void DCanvasView::contentsMouseMoveEvent
         }
 
-        // in scroll mode .. well, scroll :)
-        if (m_currentAction == act_scroll)
-        {
-                scrollBy( m_moveStart.x() - p.x(), m_moveStart.y() - p.y() );
-        }
+        // scrolling is done in mouseMoveEvent instead due to a loss of accuracy
+        me->ignore();
 }
 
@@ -613,4 +611,18 @@ void DCanvasView::contentsMouseReleaseEv
 }
 
+void DCanvasView::mousePressEvent(QMouseEvent* me)
+{
+        m_scrollStart = me->pos() + QPoint( contentsX(), contentsY() );
+}
+
+void DCanvasView::mouseMoveEvent(QMouseEvent* me)
+{
+        if (m_currentAction == act_scroll)
+        {
+                QPoint newpoint = m_scrollStart - me->pos();
+                setContentsPos( newpoint.x(), newpoint.y() );
+        }
+}
+
 void DCanvasView::contentsWheelEvent( QWheelEvent* e )
 {

--- kdeplayground-edu/kdissert/src/kdissert/canvasview/DCanvasView.h  #1.2:1.3
@@ -113,4 +113,8 @@ class DCanvasView : public QCanvasView, 
                 void keyReleaseEvent( QKeyEvent* );
 
+                // used for scrolling
+                void mousePressEvent(QMouseEvent*);
+                void mouseMoveEvent(QMouseEvent*);
+                
                 void drawContents( QPainter*, int, int, int, int);
                 void dragEnterEvent(QDragEnterEvent *event);
@@ -140,4 +144,6 @@ class DCanvasView : public QCanvasView, 
                 QPoint m_moveStart;
 
+                /// start of a scroll drag (more accurate)
+                QPoint m_scrollStart;
 
                 /// popup menu for item properties


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