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qgsundowidget.cpp
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qgsundowidget.cpp
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/***************************************************************************
qgsundowidget.cpp
---------------------
begin : June 2009
copyright : (C) 2009 by Martin Dobias
email : wonder dot sk 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 "qgsundowidget.h"
#include "qgsmaplayer.h"
#include "qgsmapcanvas.h"
#include "qgslegend.h"
#include "qgisapp.h"
#include "qgsapplication.h"
QgsUndoWidget::QgsUndoWidget( QWidget * parent, QgsMapCanvas * mapCanvas )
: QDockWidget( parent )
{
setupUi( this );
setWidget( dockWidgetContents );
connect( undoButton, SIGNAL( clicked() ), this, SLOT( undo( ) ) );
connect( redoButton, SIGNAL( clicked() ), this, SLOT( redo( ) ) );
connect( QgisApp::instance()->legend(), SIGNAL( currentLayerChanged( QgsMapLayer* ) ),
this, SLOT( layerChanged( QgsMapLayer* ) ) );
undoButton->setDisabled( true );
redoButton->setDisabled( true );
mMapCanvas = mapCanvas;
mUndoView = NULL;
mUndoStack = NULL;
mPreviousIndex = 0;
mPreviousCount = 0;
}
void QgsUndoWidget::layerChanged( QgsMapLayer * layer )
{
if ( layer != NULL )
{
setUndoStack( layer->undoStack() );
}
else
{
destroyStack();
}
emit undoStackChanged();
}
void QgsUndoWidget::destroyStack()
{
if ( mUndoStack != NULL )
{
mUndoStack->clear();
mUndoStack = NULL;
}
if ( mUndoView != NULL )
{
mUndoView->close();
mUndoView = NULL;
}
}
void QgsUndoWidget::undoChanged( bool value )
{
undoButton->setDisabled( !value );
emit undoStackChanged();
}
void QgsUndoWidget::redoChanged( bool value )
{
redoButton->setDisabled( !value );
emit undoStackChanged();
}
void QgsUndoWidget::indexChanged( int curIndx )
{
// this is called twice when a non-current command is clicked in QUndoView
// first call has offset, second call will have offset of 0
int curCount = 0;
if ( mUndoStack )
{
curCount = mUndoStack->count();
}
bool cmdAdded = ( curIndx == curCount && mPreviousCount == ( curCount - 1 ) );
int offset = qAbs( mPreviousIndex - curIndx );
// avoid refresh when only a command was added to stack (i.e. no undo/redo action)
if ( offset > 1 || ( offset == 1 && !cmdAdded ) )
{
mMapCanvas->refresh();
}
mPreviousIndex = curIndx;
mPreviousCount = curCount;
}
void QgsUndoWidget::undo( )
{
if ( mUndoStack )
mUndoStack->undo();
}
void QgsUndoWidget::redo()
{
if ( mUndoStack )
mUndoStack->redo();
}
void QgsUndoWidget::setUndoStack( QUndoStack* undoStack )
{
if ( mUndoView != NULL )
{
mUndoView->close();
delete mUndoView;
mUndoView = NULL;
}
mUndoStack = undoStack;
mPreviousIndex = mUndoStack->index();
mPreviousCount = mUndoStack->count();
mUndoView = new QUndoView( dockWidgetContents );
mUndoView->setStack( undoStack );
mUndoView->setObjectName( "undoView" );
gridLayout->addWidget( mUndoView, 0, 0, 1, 2 );
setWidget( dockWidgetContents );
connect( mUndoStack, SIGNAL( canUndoChanged( bool ) ), this, SLOT( undoChanged( bool ) ) );
connect( mUndoStack, SIGNAL( canRedoChanged( bool ) ), this, SLOT( redoChanged( bool ) ) );
// gets triggered also when a new command is added to stack, and twice when clicking a command in QUndoView
connect( mUndoStack, SIGNAL( indexChanged( int ) ), this, SLOT( indexChanged( int ) ) );
undoButton->setDisabled( !mUndoStack->canUndo() );
redoButton->setDisabled( !mUndoStack->canRedo() );
}
void QgsUndoWidget::setupUi( QDockWidget *UndoWidget )
{
if ( UndoWidget->objectName().isEmpty() )
UndoWidget->setObjectName( QString::fromUtf8( "UndoWidget" ) );
UndoWidget->resize( 200, 223 );
UndoWidget->setMinimumSize( QSize( 200, 220 ) );
dockWidgetContents = new QWidget( UndoWidget );
dockWidgetContents->setObjectName( QString::fromUtf8( "dockWidgetContents" ) );
gridLayout = new QGridLayout( dockWidgetContents );
gridLayout->setObjectName( QString::fromUtf8( "gridLayout" ) );
gridLayout->setContentsMargins( 0, 0, 0, 0 );
spacerItem = new QSpacerItem( 20, 40, QSizePolicy::Minimum, QSizePolicy::Expanding );
gridLayout->addItem( spacerItem, 0, 0, 1, 1 );
undoButton = new QPushButton( dockWidgetContents );
undoButton->setObjectName( QString::fromUtf8( "undoButton" ) );
undoButton->setIcon( QgsApplication::getThemeIcon( "mActionUndo.png" ) );
gridLayout->addWidget( undoButton, 1, 0, 1, 1 );
redoButton = new QPushButton( dockWidgetContents );
redoButton->setObjectName( QString::fromUtf8( "redoButton" ) );
redoButton->setIcon( QgsApplication::getThemeIcon( "mActionRedo.png" ) );
gridLayout->addWidget( redoButton, 1, 1, 1, 1 );
spacerItem1 = new QSpacerItem( 20, 40, QSizePolicy::Minimum, QSizePolicy::Expanding );
gridLayout->addItem( spacerItem1, 0, 1, 1, 1 );
UndoWidget->setWidget( dockWidgetContents );
retranslateUi( UndoWidget );
QMetaObject::connectSlotsByName( UndoWidget );
} // setupUi
void QgsUndoWidget::retranslateUi( QDockWidget *UndoWidget )
{
UndoWidget->setWindowTitle( QApplication::translate( "UndoWidget", "Undo/Redo", 0, QApplication::UnicodeUTF8 ) );
undoButton->setText( QApplication::translate( "UndoWidget", "Undo", 0, QApplication::UnicodeUTF8 ) );
redoButton->setText( QApplication::translate( "UndoWidget", "Redo", 0, QApplication::UnicodeUTF8 ) );
Q_UNUSED( UndoWidget );
}