UndoCommandGroup Class Reference

The UndoCommandGroup class makes it possible to pack multiple undo commands together (it acts as a parent of it's child commands) More...

#include <undocommandgroup.h>

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Public Member Functions
	UndoCommandGroup ()=delete
	UndoCommandGroup (const UndoCommandGroup &other)=delete
	UndoCommandGroup (const QString &text) noexcept
virtual	~UndoCommandGroup () noexcept
int	getChildCount () const noexcept
bool	appendChild (UndoCommand *cmd)
	Append a new command to the list of child commands. More...
UndoCommandGroup &	operator= (const UndoCommandGroup &rhs)=delete
Public Member Functions inherited from UndoCommand
	UndoCommand ()=delete
	UndoCommand (const UndoCommand &other)=delete
	UndoCommand (const QString &text) noexcept
virtual	~UndoCommand () noexcept
const QString &	getText () const noexcept
bool	wasEverExecuted () const noexcept
	This method shows whether that command was ever executed (execute() called successfully) More...
bool	wasEverReverted () const noexcept
	This method shows whether that command was ever reverted (undo() called at least one time) More...
bool	isCurrentlyExecuted () const noexcept
	This method shows whether that command is currently executed (redo() called one time more than undo()) More...
virtual bool	execute () final
	Execute the command (must only be called once) More...
virtual void	undo () final
	Undo the command. More...
virtual void	redo () final
	Redo the command. More...
UndoCommand &	operator= (const UndoCommand &rhs)=delete

Protected Member Functions
virtual bool	performExecute () override
	Execute the command the first time. More...
virtual void	performUndo () override
	Undo the command. More...
virtual void	performRedo () override
	Redo the command. More...
virtual void	performPostExecution () noexcept
	Perform custom actions after modifying the undo stack state. More...
void	execNewChildCmd (UndoCommand *cmd)
	Helper method for derived classes to execute and add new child commands. More...

Private Attributes
bool	mHasDoneSomething
	Memorized return value of performExecute() More...
QList< UndoCommand * >	mChilds
	All child commands. More...

Detailed Description

The UndoCommandGroup class makes it possible to pack multiple undo commands together (it acts as a parent of it's child commands)

Constructor & Destructor Documentation

UndoCommandGroup() [1/3]

UndoCommandGroup ( )

delete

UndoCommandGroup() [2/3]

UndoCommandGroup ( const UndoCommandGroup &  other )

delete

UndoCommandGroup() [3/3]

UndoCommandGroup ( const QString &  text )

explicitnoexcept

~UndoCommandGroup()

~UndoCommandGroup ( )

virtualnoexcept

Member Function Documentation

getChildCount()

int getChildCount ( ) const

inlinenoexcept

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appendChild()

bool appendChild

(

UndoCommand *

cmd

)

Append a new command to the list of child commands.

Parameters

cmd	The command to add (must not be executed already)

Return values

true	If the command was executed and has done some changes
false	If the command was not executed or has done nothing

Note

If this command was already executed (execute() called), this method will also immediately execute the newly added child command. Otherwise, it will be executed as soon as execute() is called.

Warning

This method must not be called after undo() was called the first time.

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operator=()

UndoCommandGroup& operator= ( const UndoCommandGroup &  rhs )

delete

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performExecute()

bool performExecute ( )

overrideprotectedvirtual

Execute the command the first time.

Note

This method must be implemented in all derived classes. If the first time execution is exactly identical to an "redo" action, you can simple call librepcb::editor::UndoCommand::performRedo() in the implementation of this method.

Return values

true	If the command has done some changes
false	If the command has done nothing (the command can be deleted)

Implements UndoCommand.

Reimplemented in CmdRemoveBoardItems, CmdDragSelectedBoardItems, CmdDragSelectedFootprintItems, CmdDragSelectedSymbolItems, CmdAddDeviceToBoard, CmdAddSymbolToSchematic, CmdDragSelectedSchematicItems, CmdPasteFootprintItems, CmdAddComponentToCircuit, CmdPasteBoardItems, CmdPasteSchematicItems, CmdPasteSymbolItems, CmdCombineSchematicNetSegments, CmdCombineBoardNetSegments, CmdChangeNetSignalOfSchematicNetSegment, CmdRemoveSelectedSchematicItems, CmdBoardSplitNetLine, CmdCombineAllNetSignalsUnderSchematicNetPoint, CmdRemoveSelectedFootprintItems, CmdRemoveSelectedSymbolItems, CmdReplaceDevice, CmdFlipSelectedBoardItems, CmdCombineNetSignals, CmdRemoveUnusedNetSignals, CmdDeviceStrokeTextsReset, CmdSymbolInstanceTextsReset, and CmdRemoveUnusedLibraryElements.

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performUndo()

void performUndo ( )

overrideprotectedvirtual

Undo the command.

Note

This method must be implemented in all derived classes.

Implements UndoCommand.

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performRedo()

void performRedo ( )

overrideprotectedvirtual

Redo the command.

Note

This method must be implemented in all derived classes.

Implements UndoCommand.

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performPostExecution()

virtual void performPostExecution ( )

inlineprotectedvirtualnoexcept

Perform custom actions after modifying the undo stack state.

This gets called after performExecute(), performUndo() and performRedo() if any state was modified to perform additional tasks.

Attention

Must never throw any exception!

Reimplemented in CmdDragSelectedSchematicItems.

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execNewChildCmd()

void execNewChildCmd ( UndoCommand *  cmd )

protected

Helper method for derived classes to execute and add new child commands.

Parameters

cmd	The command to execute and add (must not be executed already)

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Member Data Documentation

mHasDoneSomething

bool mHasDoneSomething

private

Memorized return value of performExecute()

mChilds

QList<UndoCommand*> mChilds

private

All child commands.

The child which is executed first is at index zero, the last executed command is at the top of the list.

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The documentation for this class was generated from the following files:

• /__w/1/s/libs/librepcb/editor/undocommandgroup.h
• /__w/1/s/libs/librepcb/editor/undocommandgroup.cpp