command.cpp

Qt/Embedded是一个多平台的C++图形用户界面应用程序框架

/**********************************************************************
** Copyright (C) 2000 Trolltech AS.  All rights reserved.
**
** This file is part of Qt Designer.
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** See http://www.trolltech.com/gpl/ for GPL licensing information.
**
** Contact [e-mail] if any conditions of this licensing are
** not clear to you.
**
**********************************************************************/

#include "command.h"
#include "formwindow.h"
#include "widgetfactory.h"
#include "propertyeditor.h"
#include "metadatabase.h"
#include <widgetdatabase.h>
#include "mainwindow.h"
#include "hierarchyview.h"
#include "formlist.h"

#include <qwidget.h>
#include <qmetaobject.h>
#include <qapplication.h>
#include <qlayout.h>
#include <qmessagebox.h>
#include <qlistbox.h>
#include <qiconview.h>
#include <qmultilineedit.h>
#include <qstack.h>
#include <qheader.h>

CommandHistory::CommandHistory( int s )
    : current( -1 ), steps( s ), savedAt( -1 )
{
    history.setAutoDelete( TRUE );
    modified = FALSE;
    compressedCommand = 0;
}

void CommandHistory::addCommand( Command *cmd, bool tryCompress )
{
    if ( tryCompress ) {
	if ( !compressedCommand ||
	     compressedCommand->type() != cmd->type() ||
	     !compressedCommand->canMerge( cmd ) ) {
	    checkCompressedCommand();
	    compressedCommand = 0;
	}
	
	if ( compressedCommand ) {
	    compressedCommand->merge( cmd );
	    modified = TRUE;
	    modificationChanged( modified );
	    return;
	}
	compressedCommand = cmd;
    } else {
	checkCompressedCommand();
    }

    if ( current < (int)history.count() - 1 ) {
	if ( current < savedAt )
	    savedAt = -2;
	
	QList<Command> commands;
	commands.setAutoDelete( FALSE );

	for( int i = 0; i <= current; ++i ) {
	    commands.insert( i, history.at( 0 ) );
	    history.take( 0 );
	}

	commands.append( cmd );
	history.clear();
	history = commands;
	history.setAutoDelete( TRUE );
    } else {
	history.append( cmd );
    }

    if ( (int)history.count() > steps ) {
	savedAt--;
	history.removeFirst();
    } else {
	++current;
    }

    emitUndoRedo();
    modified = TRUE;
    modificationChanged( modified );
}

void CommandHistory::undo()
{
    checkCompressedCommand();
    compressedCommand = 0;
    if ( current > -1 ) {
	history.at( current )->unexecute();
	--current;
    }
    emitUndoRedo();
    modified = savedAt != current;
    modificationChanged( modified );
}

void CommandHistory::redo()
{
    checkCompressedCommand();
    compressedCommand = 0;
    if ( current > -1 ) {
	if ( current < (int)history.count() - 1 ) {
	    ++current;
	    history.at( current )->execute();
	}
    } else {
	if ( history.count() > 0 ) {
	    ++current;
	    history.at( current )->execute();
	}
    }
    emitUndoRedo();
    modified = savedAt != current;
    modificationChanged( modified );
}

void CommandHistory::emitUndoRedo()
{
    Command *undoCmd = 0;
    Command *redoCmd = 0;

    if ( current >= 0 && current < (int)history.count() )
	undoCmd = history.at( current );
    if ( current + 1 >= 0 && current + 1 < (int)history.count() )
	redoCmd = history.at( current + 1 );

    bool ua = (bool)undoCmd;
    QString uc;
    if ( ua )
	uc = undoCmd->name();
    bool ra = (bool)redoCmd;
    QString rc;
    if ( ra )
	rc = redoCmd->name();
    emit undoRedoChanged( ua, ra, uc, rc );
}

void CommandHistory::setModified( bool m )
{
    modified = m;
    if ( !modified )
	savedAt = current;
    modificationChanged( modified );
}

bool CommandHistory::isModified() const
{
    return modified;
}

void CommandHistory::checkCompressedCommand()
{
    if ( compressedCommand && compressedCommand->type() == Command::SetProperty ) {
	Command *c = compressedCommand;
	compressedCommand = 0;
	if ( !( (SetPropertyCommand*)c )->checkProperty() ) {
	    history.remove( current );
	    --current;
	    emitUndoRedo();
	}
    }
}

// ------------------------------------------------------------

Command::Command( const QString &n, FormWindow *fw )
    : cmdName( n ), formWin( fw )
{
}

Command::~Command()
{
}

QString Command::name() const
{
    return cmdName;
}

FormWindow *Command::formWindow() const
{
    return formWin;
}

void Command::merge( Command * )
{
}

bool Command::canMerge( Command * )
{
    return FALSE;
}

// ------------------------------------------------------------

ResizeCommand::ResizeCommand( const QString &n, FormWindow *fw,
			      QWidget *w, const QRect &oldr, const QRect &nr )
    : Command( n, fw ), widget( w ), oldRect( oldr ), newRect( nr )
{
}

void ResizeCommand::execute()
{
    widget->setGeometry( newRect );
    formWindow()->updateSelection( widget );
    formWindow()->emitUpdateProperties( widget );
    if ( WidgetFactory::layoutType( widget ) != WidgetFactory::NoLayout )
	formWindow()->updateChildSelections( widget );
}

void ResizeCommand::unexecute()
{
    widget->setGeometry( oldRect );
    formWindow()->updateSelection( widget );
    formWindow()->emitUpdateProperties( widget );
    if ( WidgetFactory::layoutType( widget ) != WidgetFactory::NoLayout )
	formWindow()->updateChildSelections( widget );
}

// ------------------------------------------------------------

InsertCommand::InsertCommand( const QString &n, FormWindow *fw,
			      QWidget *w, const QRect &g )
    : Command( n, fw ), widget( w ), geometry( g )
{
}

void InsertCommand::execute()
{
    if ( geometry.size() == QSize( 0, 0 ) ) {
	widget->move( geometry.topLeft() );
	widget->adjustSize();
    } else {
	QSize s = geometry.size().expandedTo( widget->minimumSize() );
	s = s.expandedTo( widget->minimumSizeHint() );
	QRect r( geometry.topLeft(), s );
	widget->setGeometry( r );
    }
    widget->show();
    formWindow()->widgets()->insert( widget, widget );
    formWindow()->clearSelection( FALSE );
    formWindow()->selectWidget( widget );
    formWindow()->mainWindow()->objectHierarchy()->widgetInserted( widget );
}

void InsertCommand::unexecute()
{
    widget->hide();
    formWindow()->selectWidget( widget, FALSE );
    formWindow()->widgets()->remove( widget );
    formWindow()->mainWindow()->objectHierarchy()->widgetRemoved( widget );
 }

// ------------------------------------------------------------

MoveCommand::MoveCommand( const QString &n, FormWindow *fw,
			  const QWidgetList &w,
			  const QValueList<QPoint> op,
			  const QValueList<QPoint> np,
			  QWidget *opr, QWidget *npr )
    : Command( n, fw ), widgets( w ), oldPos( op ), newPos( np ),
      oldParent( opr ), newParent( npr )
{
    widgets.setAutoDelete( FALSE );
}

void MoveCommand::merge( Command *c )
{
    MoveCommand *cmd = (MoveCommand*)c;
    newPos = cmd->newPos;
}

bool MoveCommand::canMerge( Command *c )
{
    MoveCommand *cmd = (MoveCommand*)c;
    return widgets == cmd->widgets;
}


void MoveCommand::execute()
{
    for ( QWidget *w = widgets.first(); w; w = widgets.next() ) {
	if ( !w->parentWidget() || WidgetFactory::layoutType( w->parentWidget() ) == WidgetFactory::NoLayout ) {
	    if ( newParent && oldParent && newParent != oldParent ) {
		QPoint pos = newParent->mapFromGlobal( w->mapToGlobal( QPoint( 0,0 ) ) );
		w->reparent( newParent, pos, TRUE );
		formWindow()->raiseSelection( w );
		formWindow()->raiseChildSelections( w );
		formWindow()->widgetChanged( w );
		formWindow()->mainWindow()->objectHierarchy()->widgetRemoved( w );
		formWindow()->mainWindow()->objectHierarchy()->widgetInserted( w );
	    }
	    w->move( newPos[ widgets.at() ] );
	}
	formWindow()->updateSelection( w );
	formWindow()->updateChildSelections( w );
	formWindow()->emitUpdateProperties( w );
    }
}

void MoveCommand::unexecute()
{
    for ( QWidget *w = widgets.first(); w; w = widgets.next() ) {
	if ( !w->parentWidget() || WidgetFactory::layoutType( w->parentWidget() ) == WidgetFactory::NoLayout ) {
	    if ( newParent && oldParent && newParent != oldParent ) {
		QPoint pos = oldParent->mapFromGlobal( w->mapToGlobal( QPoint( 0,0 ) ) );
		w->reparent( oldParent, pos, TRUE );
		formWindow()->raiseSelection( w );
		formWindow()->raiseChildSelections( w );
		formWindow()->widgetChanged( w );
		formWindow()->mainWindow()->objectHierarchy()->widgetRemoved( w );
		formWindow()->mainWindow()->objectHierarchy()->widgetInserted( w );
	    }
	    w->move( oldPos[ widgets.at() ] );
	}
	formWindow()->updateSelection( w );
	formWindow()->updateChildSelections( w );
	formWindow()->emitUpdateProperties( w );
    }
}

// ------------------------------------------------------------

DeleteCommand::DeleteCommand( const QString &n, FormWindow *fw,
			      const QWidgetList &w )
    : Command( n, fw ), widgets( w )
{
    widgets.setAutoDelete( FALSE );
}

void DeleteCommand::execute()
{
    formWindow()->setPropertyShowingBlocked( TRUE );
    connections.clear();
    for ( QWidget *w = widgets.first(); w; w = widgets.next() ) {
	w->hide();
	formWindow()->selectWidget( w, FALSE );
	formWindow()->widgets()->remove( w );
	QValueList<MetaDataBase::Connection> conns = MetaDataBase::connections( formWindow(), w );
	connections.insert( w, conns );
	QValueList<MetaDataBase::Connection>::Iterator it = conns.begin();
	for ( ; it != conns.end(); ++it ) {
	    MetaDataBase::removeConnection( formWindow(), (*it).sender,
					    (*it).signal, (*it).receiver, (*it).slot );
	}
    }
    formWindow()->setPropertyShowingBlocked( FALSE );
    formWindow()->emitShowProperties();
    formWindow()->mainWindow()->objectHierarchy()->widgetsRemoved( widgets );

}

void DeleteCommand::unexecute()
{
    formWindow()->setPropertyShowingBlocked( TRUE );
    formWindow()->clearSelection( FALSE );
    for ( QWidget *w = widgets.first(); w; w = widgets.next() ) {
	w->show();
	formWindow()->widgets()->insert( w, w );
	formWindow()->selectWidget( w );
	QValueList<MetaDataBase::Connection> conns = *connections.find( w );
	QValueList<MetaDataBase::Connection>::Iterator it = conns.begin();
	for ( ; it != conns.end(); ++it ) {
	    MetaDataBase::addConnection( formWindow(), (*it).sender,
					 (*it).signal, (*it).receiver, (*it).slot );
	}
    }
    formWindow()->setPropertyShowingBlocked( FALSE );
    formWindow()->emitShowProperties();
    formWindow()->mainWindow()->objectHierarchy()->widgetsInserted( widgets );
}

// ------------------------------------------------------------

SetPropertyCommand::SetPropertyCommand( const QString &n, FormWindow *fw,
					QWidget *w, PropertyEditor *e,
					const QString &pn, const QVariant &ov,
					const QVariant &nv, const QString &ncut,
					const QString &ocut, bool reset )
    : Command( n, fw ), widget( w ), editor( e ), propName( pn ),
      oldValue( ov ), newValue( nv ), oldCurrentItemText( ocut ), newCurrentItemText( ncut ),
      wasChanged( TRUE ), isResetCommand( reset )
{
    wasChanged = MetaDataBase::isPropertyChanged( w, propName );
}


void SetPropertyCommand::execute()