libqgis-dev 2.4.0-1+b1 / usr / include / qgis / qgscomposeritemcommand.h

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/***************************************************************************
                          qgscomposeritemcommand.h
                          ------------------------
    begin                : 2010-11-18
    copyright            : (C) 2010 by Marco Hugentobler
    email                : marco dot hugentobler at sourcepole dot ch
***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   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 QGSCOMPOSERITEMCOMMAND_H
#define QGSCOMPOSERITEMCOMMAND_H

#include <QUndoCommand>
#include <QDomDocument>

class QgsComposerItem;

/**Undo command to undo/redo all composer item related changes*/
class CORE_EXPORT QgsComposerItemCommand: public QUndoCommand
{
  public:
    QgsComposerItemCommand( QgsComposerItem* item, const QString& text, QUndoCommand* parent = 0 );
    virtual ~QgsComposerItemCommand();

    /**Reverses the command*/
    void undo();
    /**Replays the command*/
    void redo();

    /**Saves current item state as previous state*/
    void savePreviousState();
    /**Saves current item state as after state*/
    void saveAfterState();

    QDomDocument previousState() const { return mPreviousState.cloneNode().toDocument(); }
    QDomDocument afterState() const { return mAfterState.cloneNode().toDocument(); }

    /**Returns true if previous state and after state are valid and different*/
    bool containsChange() const;

    const QgsComposerItem* item() const { return mItem; }

  protected:
    /**Target item of the command*/
    QgsComposerItem* mItem;
    /**XML that saves the state before executing the command*/
    QDomDocument mPreviousState;
    /**XML containing the state after executing the command*/
    QDomDocument mAfterState;

    /**Flag to prevent the first redo() if the command is pushed to the undo stack*/
    bool mFirstRun;

    void saveState( QDomDocument& stateDoc ) const;
    void restoreState( QDomDocument& stateDoc ) const;
};

/**A composer command that merges together with other commands having the same context (=id). Keeps the oldest previous state and uses the
  newest after state. The purpose is to avoid too many micro changes in the history*/
class CORE_EXPORT QgsComposerMergeCommand: public QgsComposerItemCommand
{
  public:
    enum Context
    {
      Unknown = 0,
      //composer label
      ComposerLabelSetText,
      ComposerLabelSetId,
      //composer map
      ComposerMapRotation,
      ComposerMapAnnotationDistance,
      //composer legend
      ComposerLegendText,
      LegendColumnCount,
      LegendSplitLayer,
      LegendEqualColumnWidth,
      LegendSymbolWidth,
      LegendSymbolHeight,
      LegendWmsLegendWidth,
      LegendWmsLegendHeight,
      LegendTitleSpaceBottom,
      LegendGroupSpace,
      LegendLayerSpace,
      LegendSymbolSpace,
      LegendIconSymbolSpace,
      LegendBoxSpace,
      LegendColumnSpace,
      //composer picture
      ComposerPictureRotation,
      // composer scalebar
      ScaleBarLineWidth,
      ScaleBarHeight,
      ScaleBarSegmentSize,
      ScaleBarSegmentsLeft,
      ScaleBarNSegments,
      ScaleBarUnitText,
      ScaleBarMapUnitsSegment,
      ScaleBarLabelBarSize,
      ScaleBarBoxContentSpace,
      // composer table
      TableMaximumFeatures,
      TableMargin,
      TableGridStrokeWidth,
      //composer shape
      ShapeCornerRadius,
      ShapeOutlineWidth,
      //composer arrow
      ArrowOutlineWidth,
      ArrowHeadWidth,
      //item
      ItemOutlineWidth,
      ItemMove,
      ItemRotation,
      ItemTransparency
    };

    QgsComposerMergeCommand( Context c, QgsComposerItem* item, const QString& text );
    ~QgsComposerMergeCommand();

    bool mergeWith( const QUndoCommand * command );
    int id() const { return ( int )mContext; }

  private:
    Context mContext;
};

#endif // QGSCOMPOSERITEMCOMMAND_H

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