File indexing completed on 2024-04-21 15:23:38

 /********************************************************************************
  * Copyright (C) 2011-2015 by Stephen Allewell                                  *
  * steve.allewell@gmail.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.                                          *
  ********************************************************************************/
 
 
 /**
  * @file
  * Implement the various QUndoCommand based commands that modify the editor
  * or the symbol library.
  */
 
 
 /**
  * @page command Commands
  * A series of QUndoCommand derived commands are used to make modifications to the
  * editor and the symbol library.  These commands are pushed onto the relevant undo
  * stacks associated with the editor or the symbol library causing them to be
  * executed. This allows undo and redo functionality to be implemented.
  *
  * All functionality, including updating the views are encapsulated within the commands
  * undo and redo functions and the functions called by them.
  */
 
 
 #include "Commands.h"
 
 #include <QPainterPath>
 #include <QMimeData>
 
 #include <KLocalizedString>
 
 #include "Editor.h"
 #include "SymbolLibrary.h"
 
 
 enum IDs {MoveTo,
           LineTo,
           CubicTo,
           Rectangle,
           Ellipse,
           MovePoint,
           UpdateSymbol,
           ImportLibrary,
           RotateLeft,
           RotateRight,
           FlipHorizontal,
           FlipVertical,
           ChangeFilled,
           ChangeFillRule,
           ChangeCapStyle,
           ChangeJoinStyle,
           DeleteSymbol,
           IncreaseLineWidth,
           DecreaseLineWidth,
           DragAndDrop
          };
 
 
 /**
  * Constructor
  *
  * @param editor a pointer to the Editor
  * @param to a const reference to a QPointF representing the point to move to
  */
 MoveToCommand::MoveToCommand(Editor *editor, const QPointF &to)
     :   QUndoCommand(i18n("Move To")),
         m_editor(editor),
         m_to(to)
 {
 }
 
 
 /**
  * Destructor
  */
 MoveToCommand::~MoveToCommand()
 {
 }
 
 
 /**
  * Undo the move to command. Restores the path saved during redo.
  */
 void MoveToCommand::undo()
 {
     m_editor->removeLast(m_path);
 }
 
 
 /**
  * Redo the move command. Call the Editor moveTo function with the m_to point
  * returning the QPainterPath existing before the moveTo which is saved for undo.
  */
 void MoveToCommand::redo()
 {
     m_path = m_editor->moveTo(m_to);
 }
 
 
 /**
  * Constructor
  *
  * @param editor a pointer to the Editor
  * @param to a const reference to a QPointF representing the point to draw to
  */
 LineToCommand::LineToCommand(Editor *editor, const QPointF &to)
     :   QUndoCommand(i18n("Draw To")),
         m_editor(editor),
         m_to(to)
 {
 }
 
 
 /**
  * Destructor
  */
 LineToCommand::~LineToCommand()
 {
 }
 
 
 /**
  * Undo the line command. Restore the path saved during redo.
  */
 void LineToCommand::undo()
 {
     m_editor->removeLast(m_path);
 }
 
 
 /**
  * Redo the line command. Call the Editor lineTo function with the m_to point
  * returning the QPainterPath existing before the lineTo which is saved for undo.
  */
 void LineToCommand::redo()
 {
     m_path = m_editor->lineTo(m_to);
 }
 
 
 /**
  * Constructor
  *
  * @param editor a pointer to the Editor
  * @param control1 a const reference to a QPointF representing the first control point
  * @param control2 a const reference to a QPointF representing the second control point
  * @param to a const reference to a QPointF representing the end point of the curve
  */
 CubicToCommand::CubicToCommand(Editor *editor, const QPointF &control1, const QPointF &control2, const QPointF &to)
     :   QUndoCommand(i18n("Cubic To")),
         m_editor(editor),
         m_control1(control1),
         m_control2(control2),
         m_to(to)
 {
 }
 
 
 /**
  * Destructor
  */
 CubicToCommand::~CubicToCommand()
 {
 }
 
 
 /**
  * Undo the cubic command. Restore the path saved during redo.
  */
 void CubicToCommand::undo()
 {
     m_editor->removeLast(m_path);
 }
 
 
 /**
  * Redo the cubic command. Call the Editor cubicTo function with the three points
  * returning the QPainterPath existing before the cubicTo which is saved for undo.
  */
 void CubicToCommand::redo()
 {
     m_path = m_editor->cubicTo(m_control1, m_control2, m_to);
 }
 
 
 /**
  * Constructor
  *
  * @param editor a pointer to the Editor
  * @param from a const reference to a QPointF representing the first corner
  * @param to a const reference to a QPointF representing the second corner
  */
 RectangleCommand::RectangleCommand(Editor *editor, const QPointF &from, const QPointF &to)
     :   QUndoCommand(i18n("Add Rectangle")),
         m_editor(editor),
         m_from(from),
         m_to(to)
 {
 }
 
 
 /**
  * Destructor
  */
 RectangleCommand::~RectangleCommand()
 {
 }
 
 
 /**
  * Undo the rectangle command. Restore the path saved during redo.
  */
 void RectangleCommand::undo()
 {
     m_editor->removeLast(m_path);
 }
 
 
 /**
  * Redo the rectangle command. Call the Editor addRectangle function with the two points
  * returning the QPainterPath existing before the addRectangle which is saved for undo.
  */
 void RectangleCommand::redo()
 {
     m_path = m_editor->addRectangle(m_from, m_to);
 }
 
 
 /**
  * Constructor
  *
  * @param editor a pointer to the Editor
  * @param from a const reference to a QPointF representing the first corner
  * @param to a const reference to a QPointF representing the second corner
  */
 EllipseCommand::EllipseCommand(Editor *editor, const QPointF &from, const QPointF &to)
     :   QUndoCommand(i18n("Add Ellipse")),
         m_editor(editor),
         m_from(from),
         m_to(to)
 {
 }
 
 
 /**
  * Destructor
  */
 EllipseCommand::~EllipseCommand()
 {
 }
 
 
 /**
  * Undo the ellipse command. Restore the path saved during redo.
  */
 void EllipseCommand::undo()
 {
     m_editor->removeLast(m_path);
 }
 
 
 /**
  * Redo the ellipse command. Call the Editor addEllipse function with the two points
  * returning the QPainterPath existing before the addEllipse which is saved for undo.
  */
 void EllipseCommand::redo()
 {
     m_path = m_editor->addEllipse(m_from, m_to);
 }
 
 
 /**
  * Constructor
  *
  * @param editor a pointer to the Editor
  * @param index the index of the point in the Editor::m_points list
  * @param from a const reference to a QPointF representing the original position
  * @param to a const reference to a QPointF representing the new position
  */
 MovePointCommand::MovePointCommand(Editor *editor, int index, const QPointF &from, const QPointF &to)
     :   QUndoCommand(i18n("Move point")),
         m_editor(editor),
         m_index(index),
         m_from(from),
         m_to(to)
 {
 }
 
 
 /**
  * Destructor
  */
 MovePointCommand::~MovePointCommand()
 {
 }
 
 
 /**
  * Undo the move point command. Call the Editor::movePoint function to move the
  * indexed point to its original from position.
  */
 void MovePointCommand::undo()
 {
     m_editor->movePoint(m_index, m_from);
 }
 
 
 /**
  * Redo the move point command. Call the Editor::movePoint function to move the
  * indexed point to the to position.
  */
 void MovePointCommand::redo()
 {
     m_editor->movePoint(m_index, m_to);
 }
 
 
 /**
  * Constructor
  *
  * @param library a pointer to the SymbolLibrary
  * @param index the index of the symbol to be updated
  * @param symbol a const reference to a Symbol representing the updated symbol
  */
 UpdateSymbolCommand::UpdateSymbolCommand(SymbolLibrary *library, qint16 index, const Symbol &symbol)
     :   QUndoCommand(i18n("Update Symbol")),
         m_symbolLibrary(library),
         m_index(index),
         m_symbol(symbol)
 {
 }
 
 
 /**
  * Destructor
  */
 UpdateSymbolCommand::~UpdateSymbolCommand()
 {
 }
 
 
 /**
  * Undo the update symbol command. If the original path was not empty it is restored
  * to the indexed symbol otherwise the indexes symbol is removed from the library.
  */
 void UpdateSymbolCommand::undo()
 {
     if (m_originalSymbol.path().isEmpty()) {
         m_symbolLibrary->takeSymbol(m_index);
         m_index = 0;
     } else {
         m_symbolLibrary->setSymbol(m_index, m_originalSymbol);
     }
 }
 
 
 /**
  * Redo the update symbol command. The original Symbol is saved for undo. This may be empty.
  * The new Symbol is set in the library for the given index. If the index is 0 a new index
  * is generated, returned and saved for undo.
  */
 void UpdateSymbolCommand::redo()
 {
     m_originalSymbol = m_symbolLibrary->symbol(m_index);
     m_index = m_symbolLibrary->setSymbol(m_index, m_symbol);
 }
 
 
 /**
  * Constructor
  *
  * @param library a pointer to the SymbolLibrary
  * @param imported a pointer to the imported SymbolLibrary
  */
 ImportLibraryCommand::ImportLibraryCommand(SymbolLibrary *library, SymbolLibrary *imported)
     :   QUndoCommand(i18n("Import Library")),
         m_symbolLibrary(library),
         m_imported(imported)
 {
 }
 
 
 /**
  * Destructor
  * The imported library is deleted as this class has taken ownership of it.
  */
 ImportLibraryCommand::~ImportLibraryCommand()
 {
     delete m_imported;
 }
 
 
 /**
  * Undo the import library command. All symbols that were added are removed
  * from the library. The list of added indexes is cleared.
  */
 void ImportLibraryCommand::undo()
 {
     foreach (qint16 i, m_addedIndexes) {
         m_symbolLibrary->takeSymbol(i);
     }
 
     m_addedIndexes.clear();
 }
 
 
 /**
  * Redo the import library command. Each symbol in the imported library are added to the current
  * library creating new indexes which are added to the m_addedIndexes list for undo.
  */
 void ImportLibraryCommand::redo()
 {
     foreach (qint16 i, m_imported->indexes()) {
         m_addedIndexes.append(m_symbolLibrary->setSymbol(0, m_imported->symbol(i))); // gets a new index
     }
 }
 
 
 /**
  * Constructor
  *
  * @param editor a pointer to the Editor
  */
 RotateLeftCommand::RotateLeftCommand(Editor *editor)
     :   QUndoCommand(i18n("Rotate Left")),
         m_editor(editor)
 {
 }
 
 
 /**
  * Destructor
  */
 RotateLeftCommand::~RotateLeftCommand()
 {
 }
 
 
 /**
  * Undo the rotate left command. Call the Editor::rotatePointRight function to reverse
  * the rotate left.
  */
 void RotateLeftCommand::undo()
 {
     m_editor->rotatePointsRight();
 }
 
 
 /**
  * Redo the rotate left command. Call the Editor::rotatePointsLeft function to rotate the points.
  */
 void RotateLeftCommand::redo()
 {
     m_editor->rotatePointsLeft();
 }
 
 
 /**
  * Constructor
  *
  * @param editor a pointer to the Editor
  */
 RotateRightCommand::RotateRightCommand(Editor *editor)
     :   QUndoCommand(i18n("Rotate Right")),
         m_editor(editor)
 {
 }
 
 
 /**
  * Destructor
  */
 RotateRightCommand::~RotateRightCommand()
 {
 }
 
 
 /**
  * Undo the rotate right command. Call the Editor::rotatePointsLeft function to reverse
  * the rotate right.
  */
 void RotateRightCommand::undo()
 {
     m_editor->rotatePointsLeft();
 }
 
 
 /**
  * Redo the rotate right command. Call the Editor::rotatePointsRight function to rotate the points.
  */
 void RotateRightCommand::redo()
 {
     m_editor->rotatePointsRight();
 }
 
 
 /**
  * Constructor
  *
  * @param editor a pointer to the Editor
  */
 FlipHorizontalCommand::FlipHorizontalCommand(Editor *editor)
     :   QUndoCommand(i18n("Flip Horizontal")),
         m_editor(editor)
 {
 }
 
 
 /**
  * Destructor
  */
 FlipHorizontalCommand::~FlipHorizontalCommand()
 {
 }
 
 
 /**
  * Undo the flip horizontal command. Call the Editor::flipPointsHorizontal to flip the points.
  */
 void FlipHorizontalCommand::undo()
 {
     m_editor->flipPointsHorizontal();
 }
 
 
 /**
  * Redo the flip horizontal command. Call the Editor::flipPointsHorizontal to flip the points.
  */
 void FlipHorizontalCommand::redo()
 {
     m_editor->flipPointsHorizontal();
 }
 
 
 /**
  * Constructor
  *
  * @param editor a pointer to the Editor
  */
 FlipVerticalCommand::FlipVerticalCommand(Editor *editor)
     :   QUndoCommand(i18n("Flip Vertical")),
         m_editor(editor)
 {
 }
 
 
 /**
  * Destructor
  */
 FlipVerticalCommand::~FlipVerticalCommand()
 {
 }
 
 
 /**
  * Undo the flip vertical command. Call the Editor::flipPointsVertical to flip the points.
  */
 void FlipVerticalCommand::undo()
 {
     m_editor->flipPointsVertical();
 }
 
 
 /**
  * Redo the flip vertical command. Call the Editor::flipPointsVertical to flip the points.
  */
 void FlipVerticalCommand::redo()
 {
     m_editor->flipPointsVertical();
 }
 
 
 /**
  * Constructor
  *
  * @param editor a pointer to the editor
  * @param painterPath the current path to scale
  * @param gridElements the number of elements along the grid side
  * @param borderSize the number of elements required for the border
  */
 ScalePreferredCommand::ScalePreferredCommand(Editor *editor, const QPainterPath &originalSymbol, int gridElements, int borderSize)
     :   QUndoCommand(i18n("Scale to Preferred Size")),
         m_editor(editor),
         m_originalSymbol(originalSymbol),
         m_gridElements(gridElements),
         m_borderSize(borderSize)
 {
 }
 
 
 /**
  * Destructor.
  */
 ScalePreferredCommand::~ScalePreferredCommand()
 {
 }
 
 
 /**
  * Undo the scale command. Restore the original path.
  */
 void ScalePreferredCommand::undo()
 {
     m_editor->setPath(m_originalSymbol);
 }
 
 
 /**
  * Redo the scale command. Apply the scaled symbol.
  */
 void ScalePreferredCommand::redo()
 {
     double borderSize = double(m_borderSize) / double(m_gridElements);
     double threshold = 0.01;
     QRectF fullSize(0.0, 0.0, 1.0, 1.0);
     QRectF preferredSize(borderSize, borderSize, 1.0 - borderSize - borderSize, 1.0 - borderSize - borderSize);
 
     QPainterPath border;
     border.addRect(fullSize);
     border.addRect(preferredSize.adjusted(-threshold, -threshold, threshold, threshold));
     border.setFillRule(Qt::OddEvenFill);
 
     if (m_originalSymbol.intersects(border)) {
         QRectF boundingRect = m_originalSymbol.boundingRect();
         double leftOverlap = std::max(preferredSize.left() - boundingRect.left(), 0.0);
         double topOverlap = std::max(preferredSize.top() - boundingRect.top(), 0.0);
         double rightOverlap = std::max(boundingRect.right() - preferredSize.right(), 0.0);
         double bottomOverlap = std::max(boundingRect.bottom() - preferredSize.bottom(), 0.0);
         double overlap = std::max(std::max(leftOverlap, rightOverlap), std::max(topOverlap, bottomOverlap));
         QRectF startingSize = preferredSize.adjusted(-overlap, -overlap, overlap, overlap);
         double scale = preferredSize.width() / startingSize.width();
         QTransform transform = QTransform::fromTranslate(-0.5, -0.5) * QTransform::fromScale(scale, scale) * QTransform::fromTranslate(0.5, 0.5);
         QPainterPath scaledPath = transform.map(m_originalSymbol);
         m_editor->setPath(scaledPath);
     }
 }
 
 
 /**
  * Constructor
  *
  * @param editor a pointer to the Editor
  * @param from @c true if the currently filled, @c false otherwise
  * @param to @c true if changing to filled, @c false otherwise
  */
 ChangeFilledCommand::ChangeFilledCommand(Editor *editor, bool from, bool to)
     :   QUndoCommand(i18n("Change Fill State")),
         m_editor(editor),
         m_from(from),
         m_to(to)
 {
 }
 
 
 /**
  * Destructor
  */
 ChangeFilledCommand::~ChangeFilledCommand()
 {
 }
 
 
 /**
  * Undo the change fill state command. Call the Editor::setFilled function to set the original value
  */
 void ChangeFilledCommand::undo()
 {
     m_editor->setFilled(m_from);
 }
 
 
 /**
  * Redo the change fill state command. Call the Editor::setFilled function to set the new value.
  */
 void ChangeFilledCommand::redo()
 {
     m_editor->setFilled(m_to);
 }
 
 
 /**
  * Constructor
  *
  * @param editor a point to the Editor
  * @param from a Qt::FillRule value representing the original setting
  * @param to a Qt::FillRule value representing the new setting
  */
 ChangeFillRuleCommand::ChangeFillRuleCommand(Editor *editor, Qt::FillRule from, Qt::FillRule to)
     :   QUndoCommand(i18n("Change Fill Rule")),
         m_editor(editor),
         m_from(from),
         m_to(to)
 {
 }
 
 
 /**
  * Destructor
  */
 ChangeFillRuleCommand::~ChangeFillRuleCommand()
 {
 }
 
 
 /**
  * Undo the change fill rule command. Call the Editor::setFillRule function to set the original value.
  */
 void ChangeFillRuleCommand::undo()
 {
     m_editor->setFillRule(m_from);
 }
 
 
 /**
  * Redo the change fill rule command. Call the Editor::setFillRule function to set the new value.
  */
 void ChangeFillRuleCommand::redo()
 {
     m_editor->setFillRule(m_to);
 }
 
 
 /**
  * Constructor
  *
  * @param editor a pointer to the Editor
  * @param from a Qt::PenCapStyle value representing the orginal setting
  * @param to a Qt::PenCapStyle value representing the new setting
  */
 ChangeCapStyleCommand::ChangeCapStyleCommand(Editor *editor, Qt::PenCapStyle from, Qt::PenCapStyle to)
     :   QUndoCommand(i18n("Change Cap Style")),
         m_editor(editor),
         m_from(from),
         m_to(to)
 {
 }
 
 
 /**
  * Destructor
  */
 ChangeCapStyleCommand::~ChangeCapStyleCommand()
 {
 }
 
 
 /**
  * Undo the change pen cap style command.
  */
 void ChangeCapStyleCommand::undo()
 {
     m_editor->setCapStyle(m_from);
 }
 
 
 /**
  * Redo the change pen cap style command.
  */
 void ChangeCapStyleCommand::redo()
 {
     m_editor->setCapStyle(m_to);
 }
 
 
 /**
  * Constructor
  *
  * @param editor a pointer to the Editor
  * @param from a Qt::PenJoinStyle value representing the original setting
  * @param to a Qt::PenJoinStyle value representing the new setting
  */
 ChangeJoinStyleCommand::ChangeJoinStyleCommand(Editor *editor, Qt::PenJoinStyle from, Qt::PenJoinStyle to)
     :   QUndoCommand(i18n("Change Join Style")),
         m_editor(editor),
         m_from(from),
         m_to(to)
 {
 }
 
 
 /**
  * Destructor
  */
 ChangeJoinStyleCommand::~ChangeJoinStyleCommand()
 {
 }
 
 
 /**
  * Undo the change pen join style command.
  */
 void ChangeJoinStyleCommand::undo()
 {
     m_editor->setJoinStyle(m_from);
 }
 
 
 /**
  * Redo the change pen join style command.
  */
 void ChangeJoinStyleCommand::redo()
 {
     m_editor->setJoinStyle(m_to);
 }
 
 
 /**
  * Constructor
  *
  * @param library a pointer to the SymbolLibrary
  * @param index the index of the Symbol to delete
  */
 DeleteSymbolCommand::DeleteSymbolCommand(SymbolLibrary *library, qint16 index)
     :   QUndoCommand(i18n("Delete Symbol")),
         m_symbolLibrary(library),
         m_index(index)
 {
 }
 
 
 /**
  * Destructor
  */
 DeleteSymbolCommand::~DeleteSymbolCommand()
 {
 }
 
 
 /**
  * Undo deleting the Symbol restoring it from the saved one.
  */
 void DeleteSymbolCommand::undo()
 {
     m_symbolLibrary->setSymbol(m_index, m_symbol);
 }
 
 
 /**
  * Redo deleting the Symbol. Store the removed Symbol for undo.
  */
 void DeleteSymbolCommand::redo()
 {
     m_symbol = m_symbolLibrary->takeSymbol(m_index);
 }
 
 
 /**
  * Constructor
  *
  * @param editor a pointer to the Editor
  * @param from the value of the original setting
  * @param to the value of the new setting
  */
 IncreaseLineWidthCommand::IncreaseLineWidthCommand(Editor *editor, qreal from, qreal to)
     :   QUndoCommand(i18n("Increase Line Width")),
         m_editor(editor),
         m_from(from),
         m_to(to)
 {
 }
 
 
 /**
  * Destructor
  */
 IncreaseLineWidthCommand::~IncreaseLineWidthCommand()
 {
 }
 
 
 /**
  * Undo the line width increase.
  */
 void IncreaseLineWidthCommand::undo()
 {
     m_editor->setLineWidth(m_from);
 }
 
 
 /**
  * Redo the line width increase.
  */
 void IncreaseLineWidthCommand::redo()
 {
     m_editor->setLineWidth(m_to);
 }
 
 
 /**
  * Get the id related to this command.
  *
  * @return int representing the value from the IDs enum
  */
 int IncreaseLineWidthCommand::id() const
 {
     return static_cast<int>(IncreaseLineWidth);
 }
 
 
 /**
  * Merge this command with another IncreaseLineWidthCommand.
  * This allows repeated increases without additional commands added to the stack.
  *
  * @param command a pointer to the additional QUndoCommand
  *
  * @return @c true if the merge succeeded, @c false otherwise
  */
 bool IncreaseLineWidthCommand::mergeWith(const QUndoCommand *command)
 {
     if (command->id() != id()) {
         return false;
     }
 
     m_to += static_cast<const IncreaseLineWidthCommand *>(command)->m_to;
     return true;
 }
 
 
 /**
  * Constructor
  *
  * @param editor a pointer to the Editor
  * @param from the value of the original setting
  * @param to the value of the new setting
  */
 DecreaseLineWidthCommand::DecreaseLineWidthCommand(Editor *editor, qreal from, qreal to)
     :   QUndoCommand(i18n("Decrease Line Width")),
         m_editor(editor),
         m_from(from),
         m_to(to)
 {
 }
 
 
 /**
  * Destructor
  */
 DecreaseLineWidthCommand::~DecreaseLineWidthCommand()
 {
 }
 
 
 /**
  * Undo the line width decrease.
  */
 void DecreaseLineWidthCommand::undo()
 {
     m_editor->setLineWidth(m_from);
 }
 
 
 /**
  * Redo the line width decrease.
  */
 void DecreaseLineWidthCommand::redo()
 {
     m_editor->setLineWidth(m_to);
 }
 
 
 /**
  * Get the id related to this command.
  *
  * @return int representing the value from the IDs enum
  */
 int DecreaseLineWidthCommand::id() const
 {
     return static_cast<int>(DecreaseLineWidth);
 }
 
 
 /**
  * Merge this command with another DecreaseLineWidthCommand.
  * This allows repeated decreases without additional commands added to the stack.
  *
  * @param command a pointer to the additional QUndoCommand
  *
  * @return @c true if the merge succeeded, @c false otherwise
  */
 bool DecreaseLineWidthCommand::mergeWith(const QUndoCommand *command)
 {
     if (command->id() != id()) {
         return false;
     }
 
     m_to -= static_cast<const DecreaseLineWidthCommand *>(command)->m_to;
     return true;
 }
 
 
 /**
  * Constructor.
  *
  * @param library pointer to the symbol library to add the new symbols to
  * @param mimeData pointer to the QMimeData containing the new symbols
  */
 DragAndDropCommand::DragAndDropCommand(SymbolLibrary *library, const QMimeData *mimeData)
     :   QUndoCommand(i18n("Add Symbols")),
         m_library(library)
 {
     QByteArray data = mimeData->data("application/kxstitchsymbol");
     QDataStream stream(&data, QIODevice::ReadOnly);
 
     while (!stream.atEnd()) {
         Symbol symbol;
         stream >> symbol;
         m_symbols.append(symbol);
     }
 }
 
 
 /**
  * Redo the addition of symbols dragged to the list.
  */
 void DragAndDropCommand::redo()
 {
     foreach (const Symbol & symbol, m_symbols) {
         m_indexes.append(m_library->setSymbol(0, symbol));
     }
 }
 
 
 /**
  * Undo the addition of the symbols added.
  */
 void DragAndDropCommand::undo()
 {
     foreach (qint16 index, m_indexes) {
         m_library->takeSymbol(index);
     }
 
     m_indexes.clear();
 }
 
 
 /**
  * Constructor.
  *
  * @param editor a pointer to the editor
  * @param path the QPainterPath representing the character glyph
  */
 AddCharacterCommand::AddCharacterCommand(Editor *editor, const QPainterPath &path)
     :   QUndoCommand(i18n("Add Character")),
         m_editor(editor),
         m_path(path)
 {
 }
 
 
 void AddCharacterCommand::redo()
 {
     m_path = m_editor->setPath(m_path);
 }
 
 
 void AddCharacterCommand::undo()
 {
     m_path = m_editor->setPath(m_path);
 }