move map scale selector to QgsScaleComboBox class. Highlight nearest

value to the current scale when open selectors popup

python/gui/gui.sip

@@ -30,6 +30,7 @@
 %Include qgsprojectionselector.sip
 %Include qgsquickprint.sip
 %Include qgsrubberband.sip
+%Include qgsscalecombobox.sip
 %Include qgstextannotationitem.sip
 %Include qgsvertexmarker.sip
 %Include qgssearchquerybuilder.sip

python/gui/qgsscalecombobox.sip

@@ -0,0 +1,15 @@
+
+/** A combobox which lets the user select map scale from predefined list
+ * and highlights nearest to current scale valu
+ */
+class QgsScaleComboBox : QComboBox
+{
+%TypeHeaderCode
+#include <qgsscalecombobox.h>
+%End
+
+ public:
+    QgsScaleComboBox(QWidget * parent = 0);
+    ~QgsScaleComboBox();
+};
+

src/app/qgisapp.cpp

@@ -160,6 +160,7 @@
 #include "qgsrasterlayerproperties.h"
 #include "qgsrectangle.h"
 #include "qgsrenderer.h"
+#include "qgsscalecombobox.h"
 #include "qgsshortcutsmanager.h"
 #include "qgssnappingdialog.h"
 #include "qgssponsors.h"
@@ -1293,7 +1294,7 @@ void QgisApp::createStatusBar()
   mScaleLabel->setToolTip( tr( "Current map scale" ) );
   statusBar()->addPermanentWidget( mScaleLabel, 0 );
 
-  mScaleEdit = new QComboBox( statusBar() );
+  mScaleEdit = new QgsScaleComboBox( statusBar() );
   mScaleEdit->setObjectName( "mScaleEdit" );
   mScaleEdit->setFont( myFont );
   mScaleEdit->setMinimumWidth( 10 );
@@ -1307,20 +1308,6 @@ void QgisApp::createStatusBar()
   mScaleEdit->setWhatsThis( tr( "Displays the current map scale" ) );
   mScaleEdit->setToolTip( tr( "Current map scale (formatted as x:y)" ) );
 
-  // make editable and populate with predefined scales
-  mScaleEdit->setEditable( true );
-  mScaleEdit->addItem( "1:1000000" );
-  mScaleEdit->addItem( "1:500000" );
-  mScaleEdit->addItem( "1:250000" );
-  mScaleEdit->addItem( "1:100000" );
-  mScaleEdit->addItem( "1:50000" );
-  mScaleEdit->addItem( "1:25000" );
-  mScaleEdit->addItem( "1:10000" );
-  mScaleEdit->addItem( "1:5000" );
-  mScaleEdit->addItem( "1:2500" );
-  mScaleEdit->addItem( "1:1000" );
-  mScaleEdit->addItem( "1:500" );
-
   statusBar()->addPermanentWidget( mScaleEdit, 0 );
   connect( mScaleEdit, SIGNAL( currentIndexChanged( const QString & ) ), this, SLOT( userScale() ) );
   connect( mScaleEdit->lineEdit(), SIGNAL( editingFinished() ), this, SLOT( userScale() ) );

src/app/qgisapp.h

@@ -24,7 +24,6 @@ class QCursor;
 class QFileInfo;
 class QKeyEvent;
 class QLabel;
-class QComboBox;
 class QMenu;
 class QPixmap;
 class QProgressBar;
@@ -76,6 +75,8 @@ class QgsDecorationScaleBar;
 
 class QgsMessageLogViewer;
 
+class QgsScaleComboBox;
+
 #include <QMainWindow>
 #include <QToolBar>
 #include <QAbstractSocket>
@@ -1003,7 +1004,7 @@ class QgisApp : public QMainWindow, private Ui::MainWindow
     //! Widget that will live on the statusbar to display "scale 1:"
     QLabel * mScaleLabel;
     //! Widget that will live on the statusbar to display scale value
-    QComboBox * mScaleEdit;
+    QgsScaleComboBox * mScaleEdit;
     //! The validator for the mScaleEdit
     QValidator * mScaleEditValidator;
     //! Widget that will live on the statusbar to display "Coordinate / Extent"

src/gui/CMakeLists.txt

@@ -69,6 +69,7 @@ qgsprojectbadlayerguihandler.cpp
 qgsprojectionselector.cpp
 qgsquickprint.cpp
 qgsrubberband.cpp
+qgsscalecombobox.cpp
 qgstextannotationitem.cpp
 qgsvertexmarker.cpp
 qgsludialog.cpp
@@ -135,6 +136,7 @@ qgsludialog.h
 qgsprojectbadlayerguihandler.h
 qgslonglongvalidator.h
 qgssearchquerybuilder.h
+qgsscalecombobox.h
 qgsexpressionbuilderwidget.h
 qgsexpressionhighlighter.h
 qgsquerybuilder.h
@@ -167,6 +169,7 @@ qgsprojectionselector.h
 qgsrubberband.h
 qgsvertexmarker.h
 qgsmaptip.h
+qgsscalecombobox.h
 qgssearchquerybuilder.h
 qgsattributeeditor.h
 qgsfieldvalidator.h

src/gui/qgsscalecombobox.cpp

@@ -0,0 +1,70 @@
+/***************************************************************************
+                              qgsscalecombobox.h
+                              ------------------------
+  begin                : January 7, 2012
+  copyright            : (C) 2012 by Alexander Bruy
+  email                : alexander dot bruy at gmail dot com
+ ***************************************************************************/
+
+/***************************************************************************
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ ***************************************************************************/
+
+#include "qgsscalecombobox.h"
+
+#include <QAbstractItemView>
+
+QgsScaleComboBox::QgsScaleComboBox( QWidget* parent ) : QComboBox( parent )
+{
+  // make combobox editable and populate with predefined scales
+  setEditable( true );
+  addItem( "1:1000000" );
+  addItem( "1:500000" );
+  addItem( "1:250000" );
+  addItem( "1:100000" );
+  addItem( "1:50000" );
+  addItem( "1:25000" );
+  addItem( "1:10000" );
+  addItem( "1:5000" );
+  addItem( "1:2500" );
+  addItem( "1:1000" );
+  addItem( "1:500" );
+
+  setInsertPolicy( QComboBox::NoInsert );
+}
+
+QgsScaleComboBox::~QgsScaleComboBox()
+{
+}
+
+void QgsScaleComboBox::showPopup()
+{
+  QComboBox::showPopup();
+
+  QStringList parts = currentText().split( ':' );
+  bool ok;
+  int idx = 0;
+  int min = 999999;
+  long currScale = parts.at( 1 ).toLong( &ok );
+  long nextScale, delta;
+  for ( int i = 0; i < count(); i++ )
+  {
+    parts = itemText( i ).split( ':' );
+    nextScale = parts.at( 1 ).toLong( &ok );
+    delta = qAbs( currScale - nextScale );
+    if( delta < min )
+    {
+      min = delta;
+      idx = i;
+    }
+  }
+
+  blockSignals( true );
+  view()->setCurrentIndex( model()->index( idx, 0 ) );
+  blockSignals( false );
+}

src/gui/qgsscalecombobox.h

@@ -0,0 +1,38 @@
+/***************************************************************************
+                              qgsscalecombobox.h
+                              ------------------------
+  begin                : January 7, 2012
+  copyright            : (C) 2012 by Alexander Bruy
+  email                : alexander dot bruy at gmail dot com
+ ***************************************************************************/
+
+/***************************************************************************
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ ***************************************************************************/
+
+#ifndef QGSSCALECOMBOBOX_H
+#define QGSSCALECOMBOBOX_H
+
+#include <QComboBox>
+
+/** \ingroup gui
+ * A combobox which lets the user select map scale from predefined list
+ * and highlights nearest to current scale valu
+ **/
+class GUI_EXPORT QgsScaleComboBox : public QComboBox
+{
+    Q_OBJECT
+  public:
+    QgsScaleComboBox( QWidget* parent = 0 );
+    virtual ~QgsScaleComboBox();
+
+  protected:
+    void showPopup();
+};
+
+#endif // QGSSCALECOMBOBOX_H