Added SIP, fixed qgisapp to use new setter and optimized a bit

python/gui/qgsscalecombobox.sip

@@ -12,6 +12,28 @@ class QgsScaleComboBox : QComboBox
     QgsScaleComboBox(QWidget * parent = 0);
     ~QgsScaleComboBox();
 
+    //! Function to read the selected scale as text
+    // @note added in 2.0
+    QString scaleString();
+    //! Function to set the selected scale from text
+    // @note added in 2.0
+    bool setScaleString( QString scaleTxt );
+    //! Function to read the selected scale as double
+    // @note added in 2.0
+    double scale();
+    //! Function to set the selected scale from double
+    // @note added in 2.0
+    void setScale( double scale );
+ 
+   //! Helper function to convert a double to scale string
+    // Performs rounding, so an exact representation is not to
+    // be expected.
+    // @note added in 2.0
+    static QString toString( double scale );
+    //! Helper function to convert a scale string to double
+    // @note added in 2.0
+    static double toDouble( QString scaleString, bool *ok = NULL );
+
   public slots:
     void updateScales( const QStringList &scales = QStringList() );
 };

src/app/qgisapp.cpp

@@ -1467,16 +1467,10 @@ void QgisApp::createStatusBar()
   mScaleEdit->setMaximumWidth( 100 );
   mScaleEdit->setMaximumHeight( 20 );
   mScaleEdit->setContentsMargins( 0, 0, 0, 0 );
-  // QRegExp validator( "\\d+\\.?\\d*:\\d+\\.?\\d*" );
-  // QRegExp validator( "\\d+\\.?\\d*:\\d+\\.?\\d*|\\d+\\.?\\d*" );
-  // mScaleEditValidator = new QRegExpValidator( validator, mScaleEdit );
-  // mScaleEdit->setValidator( mScaleEditValidator );
   mScaleEdit->setWhatsThis( tr( "Displays the current map scale" ) );
   mScaleEdit->setToolTip( tr( "Current map scale (formatted as x:y)" ) );
 
   statusBar()->addPermanentWidget( mScaleEdit, 0 );
-  //connect( mScaleEdit, SIGNAL( currentIndexChanged( const QString & ) ), this, SLOT( userScale() ) );
-  //connect( mScaleEdit->lineEdit(), SIGNAL( editingFinished() ), this, SLOT( userScale() ) );
   connect( mScaleEdit, SIGNAL( scaleChanged() ), this, SLOT( userScale() ) );
 
   //stop rendering status bar widget
@@ -5250,15 +5244,10 @@ void QgisApp::showMouseCoordinate( const QgsPoint & p )
 
 void QgisApp::showScale( double theScale )
 {
-  if ( theScale >= 1.0 )
+  // Why has MapCanvas the scale inverted?
-    mScaleEdit->setEditText( "1:" + QString::number( theScale, 'f', 0 ) );
+  mScaleEdit->setScale( 1.0 / theScale );
-  else if ( theScale > 0.0 )
-    mScaleEdit->setEditText( QString::number( 1.0 / theScale, 'f', 0 ) + ":1" );
-  else
-    mScaleEdit->setEditText( tr( "Invalid scale" ) );
-
-  mOldScale = mScaleEdit->currentText();
 
+  // Not sure if the lines below do anything meaningful /Homann
   if ( mScaleEdit->width() > mScaleEdit->minimumWidth() )
   {
     mScaleEdit->setMinimumWidth( mScaleEdit->width() );
@@ -5267,7 +5256,7 @@ void QgisApp::showScale( double theScale )
 
 void QgisApp::userScale()
 {
-  // Why has MapCanvas the scale inversed?
+  // Why has MapCanvas the scale inverted?
   mMapCanvas->zoomScale( 1.0 / mScaleEdit->scale() );
 }
 

src/app/qgisapp.h

@@ -1236,8 +1236,6 @@ class QgisApp : public QMainWindow, private Ui::MainWindow
 
     bool cmpByText( QAction* a, QAction* b );
 
-    QString mOldScale;
-
     //! the user has trusted the project macros
     bool mTrustedMacros;
 

src/gui/qgsscalecombobox.cpp

@@ -16,6 +16,7 @@
  ***************************************************************************/
 
 #include "qgis.h"
+#include "qgslogger.h"
 #include "qgsscalecombobox.h"
 
 #include <QAbstractItemView>
@@ -30,7 +31,7 @@ QgsScaleComboBox::QgsScaleComboBox( QWidget* parent ) : QComboBox( parent )
   setEditable( true );
   setInsertPolicy( QComboBox::NoInsert );
   setCompleter( 0 );
-  connect( this, SIGNAL( currentIndexChanged( const QString & ) ), this, SLOT( fixupScale() ) );
+  connect( this, SIGNAL( activated( const QString & ) ), this, SLOT( fixupScale() ) );
   connect( lineEdit(), SIGNAL( editingFinished() ), this, SLOT( fixupScale() ) );
   fixupScale();
 }
@@ -65,7 +66,7 @@ void QgsScaleComboBox::updateScales( const QStringList &scales )
   blockSignals( true );
   clear();
   addItems( myScalesList );
-  setEditText( oldScale );
+  setScaleString( oldScale );
   blockSignals( false );
 }
 
@@ -148,18 +149,25 @@ void QgsScaleComboBox::fixupScale()
   bool ok;
   QStringList txtList;
 
+  // QgsDebugMsg( QString( "entered with oldScale: %1" ).arg( oldScale ) );
   newScale = toDouble( currentText(), &ok );
   if ( ok )
   {
-    mScale = newScale;
+    // Valid string representation
+    if ( newScale != oldScale )
+    {
+      // Scale has change, update.
+      // QgsDebugMsg( QString( "New scale OK!: %1" ).arg( newScale ) );
+      mScale = newScale;
+      setScale( mScale );
+      emit scaleChanged();
+    }
   }
-  // We set to the new string representation
+  else
-  // or reset to the old
-  setScale( mScale );
-
-  if ( oldScale != mScale )
   {
-    emit scaleChanged();
+    // Invalid string representation
+    // Reset to the old
+    setScale( mScale );
   }
 }