Base class for commands to undo/redo layout and layout object changes. More...

#include <qgslayoutundocommand.h>

Inheritance diagram for QgsAbstractLayoutUndoCommand:

Public Member Functions
	QgsAbstractLayoutUndoCommand (const QString &text, int id=0, QUndoCommand *parent=nullptr)
	Constructor for QgsLayoutUndoCommand.

QDomDocument	afterState () const
	Returns the after state for the layout.

QDomDocument	beforeState () const
	Returns the before state for the layout.

virtual bool	containsChange () const
	Returns `true` if both the before and after states are valid and different.

int	id () const override

void	redo () override

void	saveAfterState ()
	Saves current layout state as after state.

void	saveBeforeState ()
	Saves current layout state as before state.

void	undo () override

Protected Member Functions
virtual void	restoreState (QDomDocument &stateDoc)=0
	Restores the state of the object from the specified stateDoc.

virtual void	saveState (QDomDocument &stateDoc) const =0
	Saves the state of the object to the specified stateDoc.

void	setAfterState (const QDomDocument &stateDoc)
	Manually sets the after state for the command.

Protected Attributes
bool	mFirstRun = true
	Flag to prevent the first redo() if the command is pushed to the undo stack.

Detailed Description

Base class for commands to undo/redo layout and layout object changes.

Definition at line 33 of file qgslayoutundocommand.h.

Constructor & Destructor Documentation

◆ QgsAbstractLayoutUndoCommand()

QgsAbstractLayoutUndoCommand::QgsAbstractLayoutUndoCommand	(	const QString &	text,
		int	id = `0`,
		QUndoCommand *	parent = `nullptr`
	)

Constructor for QgsLayoutUndoCommand.

The id argument can be used to specify an id number for the source event - this is used to determine whether QUndoCommand command compression can apply to the command.

Definition at line 21 of file qgslayoutundocommand.cpp.

Member Function Documentation

◆ afterState()

QDomDocument QgsAbstractLayoutUndoCommand::afterState ( ) const

inline

Returns the after state for the layout.

See also: saveAfterState(); beforeState()

Definition at line 74 of file qgslayoutundocommand.h.

◆ beforeState()

QDomDocument QgsAbstractLayoutUndoCommand::beforeState ( ) const

inline

Returns the before state for the layout.

See also: saveBeforeState(); afterState()

Definition at line 67 of file qgslayoutundocommand.h.

◆ containsChange()

bool QgsAbstractLayoutUndoCommand::containsChange ( ) const

virtual

Returns true if both the before and after states are valid and different.

Definition at line 53 of file qgslayoutundocommand.cpp.

◆ id()

int QgsAbstractLayoutUndoCommand::id ( ) const

inlineoverride

Definition at line 46 of file qgslayoutundocommand.h.

◆ redo()

void QgsAbstractLayoutUndoCommand::redo ( )

override

Definition at line 32 of file qgslayoutundocommand.cpp.

◆ restoreState()

virtual void QgsAbstractLayoutUndoCommand::restoreState ( QDomDocument & stateDoc )

protectedpure virtual

Restores the state of the object from the specified stateDoc.

Subclasses must implement this to handle restoring their current state from the encapsulated state.

See also: saveState()

◆ saveAfterState()

void QgsAbstractLayoutUndoCommand::saveAfterState ( )

Saves current layout state as after state.

See also: afterState(); saveBeforeState()

Definition at line 48 of file qgslayoutundocommand.cpp.

◆ saveBeforeState()

void QgsAbstractLayoutUndoCommand::saveBeforeState ( )

Saves current layout state as before state.

See also: beforeState(); saveAfterState()

Definition at line 43 of file qgslayoutundocommand.cpp.

◆ saveState()

virtual void QgsAbstractLayoutUndoCommand::saveState ( QDomDocument & stateDoc ) const

protectedpure virtual

Saves the state of the object to the specified stateDoc.

Subclasses must implement this to handle encapsulating their current state into a DOM document.

See also: restoreState()

◆ setAfterState()

void QgsAbstractLayoutUndoCommand::setAfterState ( const QDomDocument & stateDoc )

protected

Manually sets the after state for the command.

Generally this should not be called directly.

Definition at line 58 of file qgslayoutundocommand.cpp.

◆ undo()

void QgsAbstractLayoutUndoCommand::undo ( )

override

Definition at line 26 of file qgslayoutundocommand.cpp.

Member Data Documentation

◆ mFirstRun

bool QgsAbstractLayoutUndoCommand::mFirstRun = true