menubareditor.cpp

Trolltech公司发布的基于C++图形开发环境

    paste( currentIndex );
}

// protected

bool MenuBarEditor::eventFilter( QObject * o, QEvent * e )
{
    if ( o == lineEdit && e->type() == QEvent::FocusOut ) {
	leaveEditMode();
	lineEdit->hide();
	update();
    } else if ( e->type() == QEvent::LayoutHint ) {
	resize( sizeHint() );
     }
    return QMenuBar::eventFilter( o, e );
}

void MenuBarEditor::paintEvent( QPaintEvent * )
{
    QPainter p( this );
    QRect r = rect();
    style().drawPrimitive( QStyle::PE_PanelMenuBar, &p,
			   r, colorGroup() );
    drawItems( p );
}

void MenuBarEditor::mousePressEvent( QMouseEvent * e )
{
    mousePressPos = e->pos();
    hideItem();
    lineEdit->hide();
    currentIndex = findItem( mousePressPos );
    showItem();
    update();
    e->accept();
}

void MenuBarEditor::mouseDoubleClickEvent( QMouseEvent * e )
{
    mousePressPos = e->pos();
    currentIndex = findItem( mousePressPos );
    lineEdit->hide();
    if ( currentIndex > (int)itemList.count() ) {
	insertSeparator();
	update();
    } else {
	showLineEdit();
    }
}

void MenuBarEditor::mouseMoveEvent( QMouseEvent * e )
{
    if ( e->state() & Qt::LeftButton ) {
	if ( ( e->pos() - mousePressPos ).manhattanLength() > 3 ) {
	    bool itemCreated = FALSE;
	    bool isSeparator = FALSE;
	    draggedItem = item( findItem( mousePressPos ) );
	    if ( draggedItem == &addItem ) {
		draggedItem = createItem();
		itemCreated = TRUE;
	    } else if ( draggedItem == &addSeparator ) {
                if (hasSeparator) // we can only have one separator
                    return;
		draggedItem = createItem();
		draggedItem->setSeparator( TRUE );
		draggedItem->setMenuText( "separator" );
		isSeparator = TRUE;
		itemCreated = TRUE;
	    } else {
		isSeparator = draggedItem->isSeparator();
	    }

	    MenuBarEditorItemPtrDrag * d =
		new MenuBarEditorItemPtrDrag( draggedItem, this );
	    d->setPixmap( createTextPixmap( draggedItem->menuText() ) );
	    hideItem();
	    draggedItem->setVisible( FALSE );
	    update();

	    // If the item is dropped in the same list,
	    //  we will have two instances of the same pointer
	    // in the list.
	    itemList.find( draggedItem );
	    QLNode * node = itemList.currentNode();
	    dropConfirmed = FALSE;
	    d->dragCopy(); // dragevents and stuff happens
	    if ( draggedItem ) { // item was not dropped
		if ( itemCreated ) {
		    removeItem( draggedItem );
		} else {
		    hideItem();
		    draggedItem->setVisible( TRUE );
		    draggedItem = 0;
		    showItem();
		}
	    } else if ( dropConfirmed ) { // item was dropped
		dropConfirmed = FALSE;
		hideItem();
		itemList.takeNode( node )->setVisible( TRUE );
		hasSeparator = isSeparator || hasSeparator;
		showItem();
	    } else {
		hasSeparator = isSeparator || hasSeparator;
            }
	    update();
	}
    }
}

void MenuBarEditor::dragEnterEvent( QDragEnterEvent * e )
{
    if ( MenuBarEditorItemPtrDrag::canDecode( e ) ) {
	e->accept();
	dropLine->show();
    }
}

void MenuBarEditor::dragLeaveEvent( QDragLeaveEvent * )
{
    dropLine->hide();
}

void MenuBarEditor::dragMoveEvent( QDragMoveEvent * e )
{

    QPoint pos = e->pos();
    dropLine->move( snapToItem( pos ) );

    int idx = findItem( pos );
    if ( currentIndex != idx ) {
	hideItem();
	currentIndex = idx;
	showItem();
    }
}

void MenuBarEditor::dropEvent( QDropEvent * e )
{
    MenuBarEditorItem * i = 0;

    if ( MenuBarEditorItemPtrDrag::decode( e, &i ) ) {
	draggedItem = 0;
	hideItem();
	dropInPlace( i, e->pos() );
	e->accept();
    }

    dropLine->hide();
}

void MenuBarEditor::keyPressEvent( QKeyEvent * e )
{
    if ( lineEdit->isHidden() ) { // In navigation mode
	switch ( e->key() ) {

	case Qt::Key_Delete:
	    hideItem();
	    deleteItem();
	    showItem();
	    break;

	case Qt::Key_Left:
	    e->accept();
	    navigateLeft( e->state() & Qt::ControlButton );
	    return;

	case Qt::Key_Right:
	    e->accept();
	    navigateRight( e->state() & Qt::ControlButton );
	    return; // no update

	case Qt::Key_Down:
	    e->accept();
	    focusItem();
	    return; // no update

	case Qt::Key_PageUp:
	    currentIndex = 0;
	    break;

	case Qt::Key_PageDown:
	    currentIndex = itemList.count();
	    break;

	case Qt::Key_Enter:
	case Qt::Key_Return:
	case Qt::Key_F2:
	    e->accept();
	    enterEditMode();
	    return; // no update

	case Qt::Key_Up:
	case Qt::Key_Alt:
	case Qt::Key_Shift:
	case Qt::Key_Control:
	case Qt::Key_Escape:
	    e->ignore();
	    setFocus(); // FIXME: this is because some other widget get the focus when CTRL is pressed
	    return; // no update

	case Qt::Key_C:
	    if ( e->state() & Qt::ControlButton && currentIndex < (int)itemList.count() ) {
		copy( currentIndex );
		break;
	    }

	case Qt::Key_X:
	    if ( e->state() & Qt::ControlButton && currentIndex < (int)itemList.count() ) {
		hideItem();
		cut( currentIndex );
		showItem();
		break;
	    }

	case Qt::Key_V:
	    if ( e->state() & Qt::ControlButton ) {
		hideItem();
		paste( currentIndex < (int)itemList.count() ? currentIndex + 1: itemList.count() );
		showItem();
		break;
	    }

	default:
	    if ( e->ascii() >= 32 || e->ascii() == 0 ) {
		showLineEdit();
		QApplication::sendEvent( lineEdit, e );
		e->accept();
	    } else {
		e->ignore();
	    }
	    return;
	}
    } else { // In edit mode

	switch ( e->key() ) {
	case Qt::Key_Control:
	    e->ignore();
	    return;
	case Qt::Key_Enter:
	case Qt::Key_Return:
	    leaveEditMode();
	case Qt::Key_Escape:
	    lineEdit->hide();
	    setFocus();
	    break;
	}
    }
    e->accept();
    update();
}

void MenuBarEditor::focusOutEvent( QFocusEvent * e )
{
    QWidget * fw = qApp->focusWidget();
    if ( e->lostFocus() && !::qt_cast<PopupMenuEditor*>(fw) )
	hideItem();
    update();
}

void MenuBarEditor::resizeInternals()
{
    dropLine->resize( 2, itemHeight );
    updateGeometry();
}

void MenuBarEditor::drawItems( QPainter & p )
{
    QPoint pos( borderSize(), 0 );
    uint c = 0;

    p.setPen( colorGroup().buttonText() );

    MenuBarEditorItem * i = itemList.first();
    while ( i ) {
	if ( i->isVisible() )
	    drawItem( p, i, c++, pos ); // updates x y
	i = itemList.next();
    }

    p.setPen( darkBlue );
    drawItem( p, &addItem, c++, pos );
    if ( !hasSeparator )
	drawItem( p, &addSeparator, c, pos );
}

void MenuBarEditor::drawItem( QPainter & p,
			      MenuBarEditorItem * i,
			      int idx,
			      QPoint & pos )
{
    int w = itemSize( i ).width();

    // If the item passes the right border, and it is not the first item on the line
    if ( pos.x() + w > width() && pos.x() > borderSize() ) { // wrap
	pos.ry() += itemHeight;
	pos.setX( borderSize() );
    }

    if ( i->isSeparator() ) {
	drawSeparator( p, pos );
    } else {
	int flags = QPainter::AlignLeft | QPainter::AlignVCenter |
	    Qt::ShowPrefix | Qt::SingleLine;
	p.drawText( pos.x() + borderSize(), pos.y(), w - borderSize(), itemHeight,
		    flags, i->menuText() );
    }

    if ( hasFocus() && idx == currentIndex && !draggedItem )
	p.drawWinFocusRect( pos.x(), pos.y() + 1, w, itemHeight - 2 );

    pos.rx() += w;
}

void MenuBarEditor::drawSeparator( QPainter & p, QPoint & pos )
{
    p.save();
    p.setPen( darkBlue );

    int left = pos.x();
    int top = pos.y() + 2;
    int right = left + separatorWidth - 1;
    int bottom = pos.y() + itemHeight - 4;

    p.drawLine( left, top, left, bottom );
    p.drawLine( right, top, right, bottom );

    p.fillRect( left, pos.y() + borderSize() * 2,
		separatorWidth - 1, itemHeight - borderSize() * 4,
		QBrush( darkBlue, Qt::Dense5Pattern ) );

    p.restore();
}

QSize MenuBarEditor::itemSize( MenuBarEditorItem * i )
{
    if ( i->isSeparator() )
	return QSize( separatorWidth, itemHeight );
    QRect r = fontMetrics().boundingRect( i->menuText().remove( "&") );
    return QSize( r.width() + borderSize() * 2, r.height() + borderSize() * 4 );
}

void MenuBarEditor::addItemSizeToCoords( MenuBarEditorItem * i, int & x, int & y, int w )
{
    int dx = itemSize( i ).width();
    if ( x + dx > w && x > borderSize() ) {
	y += itemHeight;
	x = borderSize();
    }
    x += dx;
}

QPoint MenuBarEditor::itemPos( int index )
{
    int x = borderSize();
    int y = 0;
    int w = width();
    int dx = 0;
    int c = 0;

    MenuBarEditorItem * i = itemList.first();

    while ( i ) {
	if ( i->isVisible() ) {
	    dx = itemSize( i ).width();
	    if ( x + dx > w && x > borderSize() ) {
		y += itemHeight;
		x = borderSize();
	    }
	    if ( c == index )
		return QPoint( x, y );
	    x += dx;
	    c++;
	}
	i = itemList.next();
    }
    dx = itemSize( &addItem ).width();
    if ( x + dx > width() && x > borderSize() ) {
	y += itemHeight;
	x = borderSize();
    }

    return QPoint( x, y );
}

QPoint MenuBarEditor::snapToItem( const QPoint & pos )
{
    int x = borderSize();
    int y = 0;
    int dx = 0;

    MenuBarEditorItem * n = itemList.first();

    while ( n ) {
	if ( n->isVisible() ) {
	    dx = itemSize( n ).width();
	    if ( x + dx > width() && x > borderSize() ) {
		y += itemHeight;
		x = borderSize();
	    }
	    if ( pos.y() > y &&
		 pos.y() < y + itemHeight &&
		 pos.x() < x + dx / 2 ) {
		return QPoint( x, y );
	    }
	    x += dx;
	}
	n = itemList.next();
    }

    return QPoint( x, y );
}

void MenuBarEditor::dropInPlace( MenuBarEditorItem * i, const QPoint & pos )
{
    int x = borderSize();
    int y = 0;
    int dx = 0;
    int idx = 0;

    MenuBarEditorItem * n = itemList.first();

    while ( n ) {
	if ( n->isVisible() ) {
	    dx = itemSize( n ).width();
	    if ( x + dx > width() && x > borderSize() ) {
		y += itemHeight;
		x = borderSize();
	    }
	    if ( pos.y() > y &&
		 pos.y() < y + itemHeight &&
		 pos.x() < x + dx / 2 )
		break;
	    x += dx;
	}
	n = itemList.next();
	idx++;
    }

    hideItem();
    Command * cmd = 0;
    int iidx = itemList.findRef( i );
    if ( iidx != -1 ) { // internal dnd
	cmd = new MoveMenuCommand( "Item Dragged", formWnd, this, iidx, idx );
	item( iidx )->setVisible( TRUE );
    } else {
	cmd = new AddMenuCommand( "Add Menu", formWnd, this, i, idx );
	dropConfirmed = TRUE; // let mouseMoveEvent set the item visible
    }
    formWnd->commandHistory()->addCommand( cmd );
    cmd->execute();
    currentIndex = ( iidx >= 0 && iidx < idx ) ? idx - 1 : idx;
    showItem();
}


void MenuBarEditor::safeDec()
{
    do {
	currentIndex--;
    } while ( currentIndex > 0 && !( item( currentIndex )->isVisible() ) );
}

void MenuBarEditor::safeInc()
{
    int max = (int)itemList.count();
    if ( !hasSeparator )
	max += 1;
    if ( currentIndex < max ) {
	do {
	    currentIndex++;
	    // skip invisible items
	} while ( currentIndex < max && !( item( currentIndex )->isVisible() ) );
    }
}

void MenuBarEditor::navigateLeft( bool ctrl )
{
    // FIXME: handle invisible items
    if ( currentIndex > 0 ) {
	hideItem();
	if ( ctrl ) {
	    ExchangeMenuCommand * cmd = new ExchangeMenuCommand( "Move Menu Left",
								 formWnd,
								 this,
								 currentIndex,
								 currentIndex - 1 );
	    formWnd->commandHistory()->addCommand( cmd );
	    cmd->execute();
	    safeDec();
	} else {
	    safeDec();
	}
	showItem();
    }
    update();
}

void MenuBarEditor::navigateRight( bool ctrl )
{
// FIXME: handle invisible items
    hideItem();
    if ( ctrl ) {
	if ( currentIndex < ( (int)itemList.count() - 1 ) ) {
	    ExchangeMenuCommand * cmd =	new ExchangeMenuCommand( "Move Menu Right",
								 formWnd,
								 this,
								 currentIndex,
								 currentIndex + 1 );
	    formWnd->commandHistory()->addCommand( cmd );
	    cmd->execute();
	    safeInc();
	}
    } else {
	safeInc();
    }
    showItem();
    update();
}

void MenuBarEditor::enterEditMode()
{
    if ( currentIndex > (int)itemList.count() ) {
	insertSeparator();
    } else {
	showLineEdit();
    }
}

void MenuBarEditor::leaveEditMode()
{
    MenuBarEditorItem * i = 0;
    if ( currentIndex >= (int)itemList.count() ) {
	i = createItem();
	// do not put rename on cmd stack
	RenameMenuCommand rename( "Rename Menu", formWnd, this, lineEdit->text(), i );
	rename.execute();
    } else {
	i = itemList.at( currentIndex );
	RenameMenuCommand * cmd =
	    new RenameMenuCommand( "Rename Menu", formWnd, this, lineEdit->text(), i );
	formWnd->commandHistory()->addCommand( cmd );
	cmd->execute();
    }
    showItem();
}

QPixmap MenuBarEditor::createTextPixmap( const QString &text )
{
    QSize sz( fontMetrics().boundingRect( text ).size() );
    QPixmap pix( sz.width() + 20, sz.height() * 2 );
    pix.fill( white );
    QPainter p( &pix, this );
    p.drawText( 2, 0, pix.width(), pix.height(), 0, text );
    p.end();
    QBitmap bm( pix.size() );
    bm.fill( color0 );
    p.begin( &bm );
    p.setPen( color1 );
    p.drawText( 2, 0, pix.width(), pix.height(), 0, text );
    p.end();
    pix.setMask( bm );
    return pix;
}