avoid useless canvas redraw when user interacts with scale selector

qgis · Jan 21, 2012 · ddb51fe · ddb51fe
1 parent 068493d
commit ddb51fe
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diff --git a/src/app/qgisapp.cpp b/src/app/qgisapp.cpp
@@ -4348,6 +4348,8 @@ void QgisApp::showScale( double theScale )
   else
     mScaleEdit->setText( tr( "Invalid scale" ) );
 
+  mOldScale = mScaleEdit->text();
+
   // Set minimum necessary width
   if ( mScaleEdit->width() > mScaleEdit->minimumWidth() )
   {
@@ -4357,6 +4359,11 @@ void QgisApp::showScale( double theScale )
 
 void QgisApp::userScale()
 {
+  if ( mOldScale == mScaleEdit->text() )
+  {
+    return;
+  }
+
   QStringList parts = mScaleEdit->text().split( ':' );
   if ( parts.size() == 2 )
   {

diff --git a/src/app/qgisapp.h b/src/app/qgisapp.h
@@ -1079,6 +1079,8 @@ class QgisApp : public QMainWindow, private Ui::MainWindow
 
     //! project changed
     void projectChanged( const QDomDocument & );
+
+    QString mOldScale;
 };
 
 #endif