WheelMouse works as in kghostview

svn path=/trunk/kdegraphics/kpdf/; revision=251103

kpdf/kpdf_pagewidget.cc

@@ -181,6 +181,40 @@ namespace KPDF
         }
         e->accept();
     }
+
+    bool PageWidget::atTop() const
+    {
+        return verticalScrollBar()->value() == verticalScrollBar()->minValue();
+    }
+
+    bool PageWidget::atBottom() const
+    {
+        return verticalScrollBar()->value() == verticalScrollBar()->maxValue();
+    }
+
+    void PageWidget::wheelEvent( QWheelEvent *e )
+    {
+        int delta = e->delta();
+        e->accept();
+        if ((e->state() & ShiftButton) == ShiftButton) {
+            if ( e->delta() > 0 )
+                emit ZoomOut();
+            else
+                emit ZoomIn();
+        }
+        else if ( delta <= -120 && atBottom() )
+        {
+            emit ReadDown();
+        }
+        else if ( delta >= 120 && atTop())
+        {
+            emit ReadUp();
+        }
+
+        else
+            QScrollView::wheelEvent( e );
+    }
+
     void PageWidget::updatePixmap()
     {
         if ( m_doc )
@@ -200,6 +234,50 @@ namespace KPDF
             viewport()->update();
         }
     }
+
+    bool PageWidget::readUp()
+    {
+        if( atTop() )
+            return false;
+        else {
+            int newValue = QMAX( verticalScrollBar()->value() - height() + 50,
+                                 verticalScrollBar()->minValue() );
+
+            /*
+              int step = 10;
+              int value = verticalScrollBar()->value();
+              while( value > newValue - step ) {
+              verticalScrollBar()->setValue( value );
+              value -= step;
+              }
+            */
+
+            verticalScrollBar()->setValue( newValue );
+            return true;
+        }
+    }
+
+    bool PageWidget::readDown()
+    {
+        if( atBottom() )
+            return false;
+        else {
+            int newValue = QMIN( verticalScrollBar()->value() + height() - 50,
+                                 verticalScrollBar()->maxValue() );
+
+            /*
+              int step = 10;
+              int value = verticalScrollBar()->value();
+              while( value < newValue + step ) {
+              verticalScrollBar()->setValue( value );
+              value += step;
+              }
+            */
+
+            verticalScrollBar()->setValue( newValue );
+            return true;
+        }
+    }
 }
 
 // vim:ts=2:sw=2:tw=78:et

kpdf/kpdf_pagewidget.h

@@ -31,6 +31,11 @@ namespace KPDF
         void setPage(int pagenum);
         int getPage() const { return m_currentPage; };
         void enableScrollBars( bool b );
+        /**
+         * Return true if the top resp. bottom of the page is visible.
+         */
+        bool atTop()    const;
+        bool atBottom() const;
     public slots:
         void nextPage();
         void previousPage();
@@ -44,15 +49,20 @@ namespace KPDF
         void scrollLeft();
         void scrollBottom();
         void scrollTop();
+        bool readUp();
+        bool readDown();
     signals:
         void linkClicked(LinkAction*);
-
+        void ReadUp();
+        void ReadDown();
+        void ZoomOut();
+        void ZoomIn();
     protected:
         virtual void keyPressEvent( QKeyEvent* );
         void contentsMousePressEvent(QMouseEvent*);
         void contentsMouseReleaseEvent(QMouseEvent*);
         void contentsMouseMoveEvent(QMouseEvent*);
-
+        virtual void wheelEvent( QWheelEvent * );
         virtual void drawContents ( QPainter *p, int, int, int, int );
 
     private:

kpdf/kpdf_part.cpp

@@ -105,6 +105,10 @@ Part::Part(QWidget *parentWidget, const char *widgetName,
 
   // set our XML-UI resource file
   setXMLFile("kpdf_part.rc");
+  connect( m_outputDev, SIGNAL( ZoomIn() ), SLOT( slotZoomIn() ));
+  connect( m_outputDev, SIGNAL( ZoomOut() ), SLOT( slotZoomOut() ));
+  connect( m_outputDev, SIGNAL( ReadUp() ), SLOT( slotReadUp() ));
+  connect( m_outputDev, SIGNAL( ReadDown() ), SLOT( slotReadDown() ));
   readSettings();
 }
 
@@ -114,7 +118,28 @@ Part::~Part()
     writeSettings();
 }
 
+void Part::slotReadUp()
+{
+    if( !m_doc )
+	return;
+
+    if( !m_outputDev->readUp() ) {
+        slotPreviousPage();
+        m_outputDev->scrollBottom();
+    }
+}
 
+void Part::slotReadDown()
+{
+    if( !m_doc )
+	return;
+
+    if( !m_outputDev->readDown() ) {
+        //todo fix if we can "next page" as in kghostview
+        slotNextPage();
+        m_outputDev->scrollTop();
+    }
+}
 
 void Part::writeSettings()
 {

kpdf/kpdf_part.h

@@ -98,6 +98,8 @@ namespace KPDF
 
       void showScrollBars( bool );
       void showMarkList( bool );
+      void slotReadUp();
+      void slotReadDown();
 
   private:
     PDFDoc*     m_doc;