Bug 87539

Summary:	Use middle mouse button to scroll image
Product:	[Applications] digikam	Reporter:	Dan Leinir Turthra Jensen <leinir>
Component:	Usability-Mouse	Assignee:	Digikam Developers <digikam-bugs-null>
Status:	RESOLVED FIXED
Severity:	wishlist	CC:	caulier.gilles
Priority:	NOR
Version:	unspecified
Target Milestone:	---
Platform:	Compiled Sources
OS:	Linux
Latest Commit:		Version Fixed In:	7.5.0

Description Dan Leinir Turthra Jensen 2004-08-19 20:58:13 UTC

Version:            (using KDE KDE 3.3.0)
Installed from:    Compiled From Sources

Really the short description says it all, but what I am suggesting is to use the middle mouse button to scroll the image in the image viewer. This behavious has already proved to be very powerful in applications like Sodipodi, InkScape and The GIMP.

Comment 1 Renchi Raju 2004-08-19 23:52:55 UTC

CVS commit by pahlibar: 



* use middle mouse button to scroll image 

CCMAIL: 87539-done@bugs.kde.org


  M +74 -32    canvas.cpp   1.19


--- kdeextragear-3/digikam/utilities/imageeditor/canvas.cpp  #1.18:1.19
@@ -75,4 +75,7 @@ public:
     bool               lbActive;
     bool               rbActive;
+    bool               midButtonPressed;
+    int                midButtonX;
+    int                midButtonY;
 
     QTimer            *paintTimer;
@@ -104,4 +107,7 @@ Canvas::Canvas(QWidget *parent)
     d->lbActive      = false;
     d->rbActive      = false;
+    d->midButtonPressed = false;
+    d->midButtonX       = 0;
+    d->midButtonY       = 0;
 
     d->qpix   = 0;
@@ -423,4 +429,8 @@ void Canvas::contentsMousePressEvent(QMo
         return;
     
+    d->midButtonPressed = false;
+    
+    if (e->button() == Qt::LeftButton)
+    {
     if (d->ltActive || d->rtActive ||
         d->lbActive || d->rbActive) {
@@ -430,5 +440,5 @@ void Canvas::contentsMousePressEvent(QMo
             return;
 
-        // Set diagonally oppposite corner as anchor
+            // Set diagonally opposite corner as anchor
         
         QRect r(d->rubber->normalize());
@@ -452,10 +462,21 @@ void Canvas::contentsMousePressEvent(QMo
         
         viewport()->setMouseTracking(false);
-        //viewport()->update();
 
-        //d->pressedMoved  = false;
         d->pressedMoving = true;
         return;
     }
+    }
+    else if (e->button() == Qt::MidButton)
+    {
+        if (visibleWidth()  < d->im->width() ||
+            visibleHeight() < d->im->height())
+        {
+            viewport()->setCursor(Qt::SizeAllCursor);
+            d->midButtonPressed = true;
+            d->midButtonX       = e->x();
+            d->midButtonY       = e->y();
+        }
+        return;
+    }
 
     if (d->rubber) {
@@ -475,8 +496,19 @@ void Canvas::contentsMousePressEvent(QMo
 void Canvas::contentsMouseMoveEvent(QMouseEvent *e)
 {
-    if (!e || !d->rubber)
+    if (!e)
         return;
 
-    if (!viewport()->hasMouseTracking()) {
+    if (e->state() == Qt::MidButton)
+    {
+        if (d->midButtonPressed)
+        {
+            scrollBy(d->midButtonX - e->x(),
+                     d->midButtonY - e->y());
+        }
+    }
+    else if (!viewport()->hasMouseTracking())
+    {
+        if (!d->rubber)
+            return;
 
         if (e->state() != Qt::LeftButton &&
@@ -503,4 +535,7 @@ void Canvas::contentsMouseMoveEvent(QMou
     else {
 
+        if (!d->rubber)
+            return;
+        
         QRect r(d->rubber->normalize());
         
@@ -541,4 +576,6 @@ void Canvas::contentsMouseReleaseEvent(Q
         return;
 
+    d->midButtonPressed = false;
+    
     if (d->pressedMoving) {
         d->pressedMoving = false;
@@ -559,6 +596,11 @@ void Canvas::contentsMouseReleaseEvent(Q
     }
 
-    if (e->button() == Qt::RightButton) {
+    if (e->button() != Qt::LeftButton)
+    {
         viewport()->unsetCursor();
+    }
+
+    if (e->button() == Qt::RightButton)
+    {
         emit signalRightButtonClicked();
     }