Copy the KDE 3.5 branch to branches/trinity for new KDE 3.5 features.

BUG:215923


git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdebase@1054174 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

1 files changed, 883 insertions, 0 deletions

diff --git a/kwin/kcmkwin/kwindecoration/buttons.cpp b/kwin/kcmkwin/kwindecoration/buttons.cpp
new file mode 100644
index 000000000..888e092e7
--- /dev/null
+++ b/kwin/kcmkwin/kwindecoration/buttons.cpp
@@ -0,0 +1,883 @@
+/*
+	This is the new kwindecoration kcontrol module
+
+	Copyright (c) 2004,  Sandro Giessl <[email protected]>
+	Copyright (c) 2001
+		Karol Szwed <[email protected]>
+		http://gallium.n3.net/
+
+	Supports new kwin configuration plugins, and titlebar button position
+	modification via dnd interface.
+
+	Based on original "kwintheme" (Window Borders)
+	Copyright (C) 2001 Rik Hemsley (rikkus) <[email protected]>
+
+    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.
+  
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+  
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+
+*/
+
+#include <qheader.h>
+#include <qpainter.h>
+#include <qlabel.h>
+#include <qlayout.h>
+#include <qstyle.h>
+
+#include <kdebug.h>
+
+#include <kdialog.h>
+#include <klocale.h>
+#include <kglobalsettings.h>
+
+#include <kdecorationfactory.h>
+
+#include "buttons.h"
+#include "pixmaps.h"
+
+
+#define BUTTONDRAGMIMETYPE "application/x-kde_kwindecoration_buttons"
+ButtonDrag::ButtonDrag( Button btn, QWidget* parent, const char* name)
+	: QStoredDrag( BUTTONDRAGMIMETYPE, parent, name)
+{
+	QByteArray data;
+	QDataStream stream(data, IO_WriteOnly);
+	stream << btn.name;
+	stream << btn.icon;
+	stream << btn.type.unicode();
+	stream << (int) btn.duplicate;
+	stream << (int) btn.supported;
+	setEncodedData( data );
+}
+
+
+bool ButtonDrag::canDecode( QDropEvent* e )
+{
+	return e->provides( BUTTONDRAGMIMETYPE );
+}
+
+bool ButtonDrag::decode( QDropEvent* e, Button& btn )
+{
+	QByteArray data = e->data( BUTTONDRAGMIMETYPE );
+	if ( data.size() )
+	{
+		e->accept();
+		QDataStream stream(data, IO_ReadOnly);
+		stream >> btn.name;
+		stream >> btn.icon;
+		ushort type;
+		stream >> type;
+		btn.type = QChar(type);
+		int duplicate;
+		stream >> duplicate;
+		btn.duplicate = duplicate;
+		int supported;
+		stream >> supported;
+		btn.supported = supported;
+		return TRUE;
+	}
+	return FALSE;
+}
+
+
+Button::Button()
+{
+}
+
+Button::Button(const QString& n, const QBitmap& i, QChar t, bool d, bool s)
+	: name(n),
+	  icon(i),
+	  type(t),
+	  duplicate(d),
+	  supported(s)
+{
+}
+
+Button::~Button()
+{
+}
+
+// helper function to deal with the Button's bitmaps more easily...
+QPixmap bitmapPixmap(const QBitmap& bm, const QColor& color)
+{
+	QPixmap pm(bm.size() );
+	pm.setMask(bm);
+	QPainter p(&pm);
+	p.setPen(color);
+	p.drawPixmap(0,0,bm);
+	p.end();
+	return pm;
+}
+
+
+ButtonSource::ButtonSource(QWidget *parent, const char* name)
+	: KListView(parent, name)
+{
+	setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
+
+	setResizeMode(QListView::AllColumns);
+	setDragEnabled(true);
+	setAcceptDrops(true);
+	setDropVisualizer(false);
+	setSorting(-1);
+	header()->setClickEnabled(false);
+	header()->hide();
+
+	addColumn(i18n("Buttons") );
+}
+
+ButtonSource::~ButtonSource()
+{
+}
+
+QSize ButtonSource::sizeHint() const
+{
+	// make the sizeHint height a bit smaller than the one of QListView...
+
+	if ( cachedSizeHint().isValid() )
+		return cachedSizeHint();
+
+	constPolish();
+
+	QSize s( header()->sizeHint() );
+
+	if ( verticalScrollBar()->isVisible() )
+		s.setWidth( s.width() + style().pixelMetric(QStyle::PM_ScrollBarExtent) );
+	s += QSize(frameWidth()*2,frameWidth()*2);
+
+	// size hint: 4 lines of text...
+	s.setHeight( s.height() + fontMetrics().lineSpacing()*3 );
+
+	setCachedSizeHint( s );
+
+	return s;
+}
+
+void ButtonSource::hideAllButtons()
+{
+	QListViewItemIterator it(this);
+	while (it.current() ) {
+		it.current()->setVisible(false);
+		++it;
+	}
+}
+
+void ButtonSource::showAllButtons()
+{
+	QListViewItemIterator it(this);
+	while (it.current() ) {
+		it.current()->setVisible(true);
+		++it;
+	}
+}
+
+void ButtonSource::showButton( QChar btn )
+{
+	QListViewItemIterator it(this);
+	while (it.current() ) {
+		ButtonSourceItem *item = dynamic_cast<ButtonSourceItem*>(it.current() );
+		if (item && item->button().type == btn) {
+			it.current()->setVisible(true);
+			return;
+		}
+		++it;
+	}
+}
+
+void ButtonSource::hideButton( QChar btn )
+{
+	QListViewItemIterator it(this);
+	while (it.current() ) {
+		ButtonSourceItem *item = dynamic_cast<ButtonSourceItem*>(it.current() );
+		if (item && item->button().type == btn && !item->button().duplicate) {
+			it.current()->setVisible(false);
+			return;
+		}
+		++it;
+	}
+}
+
+bool ButtonSource::acceptDrag(QDropEvent* e) const
+{
+	return acceptDrops() && ButtonDrag::canDecode(e);
+}
+
+QDragObject *ButtonSource::dragObject()
+{
+	ButtonSourceItem *i = dynamic_cast<ButtonSourceItem*>(selectedItem() );
+
+	if (i) {
+		ButtonDrag *bd = new ButtonDrag(i->button(), viewport(), "button_drag");
+		bd->setPixmap(bitmapPixmap(i->button().icon, colorGroup().foreground() ));
+		return bd;
+	}
+
+	return 0;
+}
+
+ButtonDropSiteItem::ButtonDropSiteItem(const Button& btn)
+	: m_button(btn)
+{
+}
+
+ButtonDropSiteItem::~ButtonDropSiteItem()
+{
+}
+
+Button ButtonDropSiteItem::button()
+{
+	return m_button;
+}
+
+int ButtonDropSiteItem::width()
+{
+// 	return m_button.icon.width();
+	return 20;
+}
+
+int ButtonDropSiteItem::height()
+{
+// 	return m_button.icon.height();
+	return 20;
+}
+
+void ButtonDropSiteItem::draw(QPainter *p, const QColorGroup& cg, QRect r)
+{
+// 	p->fillRect(r, cg.base() );
+	if (m_button.supported)
+		p->setPen(cg.foreground() );
+	else
+		p->setPen(cg.mid() );
+	QBitmap &i = m_button.icon;
+	p->drawPixmap(r.left()+(r.width()-i.width())/2, r.top()+(r.height()-i.height())/2, i);
+}
+
+
+ButtonDropSite::ButtonDropSite( QWidget* parent, const char* name )
+	: QFrame( parent, name ),
+	  m_selected(0)
+{
+	setAcceptDrops( TRUE );
+	setFrameShape( WinPanel );
+	setFrameShadow( Raised );
+	setMinimumHeight( 26 );
+	setMaximumHeight( 26 );
+	setMinimumWidth( 250 );		// Ensure buttons will fit
+}
+
+ButtonDropSite::~ButtonDropSite()
+{
+	clearLeft();
+	clearRight();
+}
+
+void ButtonDropSite::clearLeft()
+{
+	while (!buttonsLeft.isEmpty() ) {
+		ButtonDropSiteItem *item = buttonsLeft.first();
+		if (removeButton(item) ) {
+			emit buttonRemoved(item->button().type);
+			delete item;
+		}
+	}
+}
+
+void ButtonDropSite::clearRight()
+{
+	while (!buttonsRight.isEmpty() ) {
+		ButtonDropSiteItem *item = buttonsRight.first();
+		if (removeButton(item) ) {
+			emit buttonRemoved(item->button().type);
+			delete item;
+		}
+	}
+}
+
+void ButtonDropSite::dragMoveEvent( QDragMoveEvent* e )
+{
+	QPoint p = e->pos();
+	if (leftDropArea().contains(p) || rightDropArea().contains(p) || buttonAt(p) ) {
+		e->accept();
+
+		// 2 pixel wide drop visualizer...
+		QRect r = contentsRect();
+		int x = -1;
+		if (leftDropArea().contains(p) ) {
+			x = leftDropArea().left();
+		} else if (rightDropArea().contains(p) ) {
+			x = rightDropArea().right()+1;
+		} else {
+			ButtonDropSiteItem *item = buttonAt(p);
+			if (item) {
+				if (p.x() < item->rect.left()+item->rect.width()/2 ) {
+					x = item->rect.left();
+				} else {
+					x = item->rect.right()+1;
+				}
+			}
+		}
+		if (x != -1) {
+			QRect tmpRect(x, r.y(), 2, r.height() );
+			if (tmpRect != m_oldDropVisualizer) {
+				cleanDropVisualizer();
+				m_oldDropVisualizer = tmpRect;
+				update(tmpRect);
+			}
+		}
+
+	} else {
+		e->ignore();
+
+		cleanDropVisualizer();
+	}
+}
+
+void ButtonDropSite::cleanDropVisualizer()
+{
+	if (m_oldDropVisualizer.isValid())
+	{
+		QRect rect = m_oldDropVisualizer;
+		m_oldDropVisualizer = QRect(); // rect is invalid
+		update(rect);
+	}
+}
+
+void ButtonDropSite::dragEnterEvent( QDragEnterEvent* e )
+{
+	if ( ButtonDrag::canDecode( e ) )
+		e->accept();
+}
+
+void ButtonDropSite::dragLeaveEvent( QDragLeaveEvent* /* e */ )
+{
+	cleanDropVisualizer();
+}
+
+void ButtonDropSite::dropEvent( QDropEvent* e )
+{
+	cleanDropVisualizer();
+
+	QPoint p = e->pos();
+
+	// collect information where to insert the dropped button
+	ButtonList *buttonList = 0;
+	ButtonList::iterator buttonPosition;
+
+	if (leftDropArea().contains(p) ) {
+		buttonList = &buttonsLeft;
+		buttonPosition = buttonsLeft.end();
+	} else if (rightDropArea().contains(p) ) {
+		buttonList = &buttonsRight;
+		buttonPosition = buttonsRight.begin();
+	} else {
+		ButtonDropSiteItem *aboveItem = buttonAt(p);
+		if (!aboveItem)
+			return; // invalid drop. hasn't occured _over_ a button (or left/right dropArea), return...
+
+		ButtonList::iterator it;
+		if (!getItemIterator(aboveItem, buttonList, it) ) {
+			// didn't find the aboveItem. unlikely to happen since buttonAt() already seems to have found
+			// something valid. anyway...
+			return;
+		}
+
+		// got the list and the aboveItem position. now determine if the item should be inserted
+		// before aboveItem or after aboveItem.
+		QRect aboveItemRect = aboveItem->rect;
+		if (!aboveItemRect.isValid() )
+			return;
+
+		if (p.x() < aboveItemRect.left()+aboveItemRect.width()/2 ) {
+			// insert before the item
+			buttonPosition = it;
+		} else {
+			if (it != buttonList->end() )
+				buttonPosition = ++it;
+			else
+				buttonPosition = it; // already at the end(), can't increment the iterator!
+		}
+	}
+
+	// know where to insert the button. now see if we can use an existing item (drag within the widget = move)
+	// orneed to create a new one
+	ButtonDropSiteItem *buttonItem = 0;
+	if (e->source() == this && m_selected) {
+		ButtonList *oldList = 0;
+		ButtonList::iterator oldPos;
+		if (getItemIterator(m_selected, oldList, oldPos) ) {
+			if (oldPos == buttonPosition)
+				return; // button didn't change its position during the drag...
+
+			oldList->remove(oldPos);
+			buttonItem = m_selected;
+		} else {
+			return; // m_selected not found, return...
+		}
+	} else {
+		// create new button from the drop object...
+		Button btn;
+		if (ButtonDrag::decode(e, btn) ) {
+			buttonItem = new ButtonDropSiteItem(btn);
+		} else {
+			return; // something has gone wrong while we were trying to decode the drop event
+		}
+	}
+
+	// now the item can actually be inserted into the list! :)
+	(*buttonList).insert(buttonPosition, buttonItem);
+	emit buttonAdded(buttonItem->button().type);
+	emit changed();
+	recalcItemGeometry();
+	update();
+}
+
+bool ButtonDropSite::getItemIterator(ButtonDropSiteItem *item, ButtonList* &list, ButtonList::iterator &iterator)
+{
+	if (!item)
+		return false;
+
+	ButtonList::iterator it = buttonsLeft.find(item); // try the left list first...
+	if (it == buttonsLeft.end() ) {
+		it = buttonsRight.find(item); // try the right list...
+		if (it == buttonsRight.end() ) {
+			return false; // item hasn't been found in one of the list, return...
+		} else {
+			list = &buttonsRight;
+			iterator = it;
+		}
+	} else {
+		list = &buttonsLeft;
+		iterator = it;
+	}
+
+	return true;
+}
+
+QRect ButtonDropSite::leftDropArea()
+{
+	// return a 10 pixel drop area...
+	QRect r = contentsRect();
+
+	int leftButtonsWidth = calcButtonListWidth(buttonsLeft);
+	return QRect(r.left()+leftButtonsWidth, r.top(), 10, r.height() );
+}
+
+QRect ButtonDropSite::rightDropArea()
+{
+	// return a 10 pixel drop area...
+	QRect r = contentsRect();
+
+	int rightButtonsWidth = calcButtonListWidth(buttonsRight);
+	return QRect(r.right()-rightButtonsWidth-10, r.top(), 10, r.height() );
+}
+
+void ButtonDropSite::mousePressEvent( QMouseEvent* e )
+{
+	// TODO: only start the real drag after some drag distance
+	m_selected = buttonAt(e->pos() );
+	if (m_selected) {
+		ButtonDrag *bd = new ButtonDrag(m_selected->button(), this);
+		bd->setPixmap(bitmapPixmap(m_selected->button().icon, colorGroup().foreground() ) );
+		bd->dragMove();
+	}
+}
+
+void ButtonDropSite::resizeEvent(QResizeEvent*)
+{
+	recalcItemGeometry();
+}
+
+void ButtonDropSite::recalcItemGeometry()
+{
+	QRect r = contentsRect();
+
+	// update the geometry of the items in the left button list
+	int offset = r.left();
+	for (ButtonList::const_iterator it = buttonsLeft.begin(); it != buttonsLeft.end(); ++it) {
+		int w = (*it)->width();
+		(*it)->rect = QRect(offset, r.top(), w, (*it)->height() );
+		offset += w;
+	}
+
+	// the right button list...
+	offset = r.right() - calcButtonListWidth(buttonsRight);
+	for (ButtonList::const_iterator it = buttonsRight.begin(); it != buttonsRight.end(); ++it) {
+		int w = (*it)->width();
+		(*it)->rect = QRect(offset, r.top(), w, (*it)->height() );
+		offset += w;
+	}
+}
+
+ButtonDropSiteItem *ButtonDropSite::buttonAt(QPoint p) {
+	// try to find the item in the left button list
+	for (ButtonList::const_iterator it = buttonsLeft.begin(); it != buttonsLeft.end(); ++it) {
+		if ( (*it)->rect.contains(p) ) {
+			return *it;
+		}
+	}
+
+	// try to find the item in the right button list
+	for (ButtonList::const_iterator it = buttonsRight.begin(); it != buttonsRight.end(); ++it) {
+		if ( (*it)->rect.contains(p) ) {
+			return *it;
+		}
+	}
+
+	return 0;
+}
+
+bool ButtonDropSite::removeButton(ButtonDropSiteItem *item) {
+	if (!item)
+		return false;
+
+	// try to remove the item from the left button list
+	if (buttonsLeft.remove(item) >= 1) {
+		return true;
+	}
+
+	// try to remove the item from the right button list
+	if (buttonsRight.remove(item) >= 1) {
+		return true;
+	}
+
+	return false;
+}
+
+int ButtonDropSite::calcButtonListWidth(const ButtonList& btns)
+{
+	int w = 0;
+	for (ButtonList::const_iterator it = btns.begin(); it != btns.end(); ++it) {
+		w += (*it)->width();
+	}
+
+	return w;
+}
+
+bool ButtonDropSite::removeSelectedButton()
+{
+	bool succ = removeButton(m_selected);
+	if (succ) {
+		emit buttonRemoved(m_selected->button().type);
+		emit changed();
+		delete m_selected;
+		m_selected = 0;
+		recalcItemGeometry();
+		update(); // repaint...
+	}
+
+	return succ;
+}
+
+void ButtonDropSite::drawButtonList(QPainter *p, const ButtonList& btns, int offset)
+{
+	for (ButtonList::const_iterator it = btns.begin(); it != btns.end(); ++it) {
+		QRect itemRect = (*it)->rect;
+		if (itemRect.isValid() ) {
+			(*it)->draw(p, colorGroup(), itemRect);
+		}
+		offset += (*it)->width();
+	}
+}
+
+void ButtonDropSite::drawContents( QPainter* p )
+{
+	int leftoffset = calcButtonListWidth( buttonsLeft );
+	int rightoffset = calcButtonListWidth( buttonsRight );
+	int offset = 3;
+
+	QRect r = contentsRect();
+
+	// Shrink by 1
+	r.moveBy(1 + leftoffset, 1);
+	r.setWidth( r.width() - 2 - leftoffset - rightoffset );
+	r.setHeight( r.height() - 2 );
+
+	drawButtonList( p, buttonsLeft, offset );
+
+	QColor c1( 0x0A, 0x5F, 0x89 );		// KDE 2 titlebar default colour
+	p->fillRect( r, c1 );
+	p->setPen( Qt::white );
+	p->setFont( QFont( KGlobalSettings::generalFont().family(), 12, QFont::Bold) );
+	p->drawText( r, AlignLeft | AlignVCenter, i18n("KDE") );
+
+	offset = geometry().width() - 3 - rightoffset;
+	drawButtonList( p, buttonsRight, offset );
+
+	if (m_oldDropVisualizer.isValid() )
+	{
+		p->fillRect(m_oldDropVisualizer, Dense4Pattern);
+	}
+}
+
+ButtonSourceItem::ButtonSourceItem(QListView * parent, const Button& btn)
+	: QListViewItem(parent),
+	  m_button(btn),
+	  m_dirty(true)
+{
+	setButton(btn);
+}
+
+ButtonSourceItem::~ButtonSourceItem()
+{
+}
+
+void ButtonSourceItem::paintCell(QPainter *p, const QColorGroup &cg, int column, int width, int align)
+{
+	// we need the color group cg, so to the work here, not in setButton...
+	if (m_dirty) {
+		if (m_button.supported) {
+			setPixmap(0, bitmapPixmap(m_button.icon, cg.foreground() ) );
+		} else {
+			setPixmap(0, bitmapPixmap(m_button.icon, cg.mid() ) );
+		}
+		m_dirty = false;
+	}
+
+	if (m_button.supported) {
+		QListViewItem::paintCell(p,cg,column,width,align);
+	} else {
+		// grey out unsupported buttons
+		QColorGroup cg2 = cg;
+		cg2.setColor(QColorGroup::Text, cg.mid() );
+		QListViewItem::paintCell(p,cg2,column,width,align);
+	}
+}
+
+void ButtonSourceItem::setButton(const Button& btn)
+{
+	m_button = btn;
+	m_dirty = true; // update the pixmap when in paintCell()...
+	if (btn.supported) {
+		setText(0, btn.name);
+	} else {
+		setText(0, i18n("%1 (unavailable)").arg(btn.name) );
+	}
+}
+
+Button ButtonSourceItem::button() const
+{
+	return m_button;
+}
+
+
+ButtonPositionWidget::ButtonPositionWidget(QWidget *parent, const char* name)
+    : QWidget(parent,name),
+      m_factory(0)
+{
+	QVBoxLayout *layout = new QVBoxLayout(this, 0, KDialog::spacingHint() );
+	setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Maximum);
+
+	QLabel* label = new QLabel( this );
+	m_dropSite = new ButtonDropSite( this );
+	label->setAlignment( int( QLabel::WordBreak ) );
+	label->setText( i18n( "To add or remove titlebar buttons, simply <i>drag</i> items "
+		"between the available item list and the titlebar preview. Similarly, "
+		"drag items within the titlebar preview to re-position them.") );
+	m_buttonSource = new ButtonSource(this, "button_source");
+
+	layout->addWidget(label);
+	layout->addWidget(m_dropSite);
+	layout->addWidget(m_buttonSource);
+
+	connect( m_dropSite, SIGNAL(buttonAdded(QChar)), m_buttonSource, SLOT(hideButton(QChar)) );
+	connect( m_dropSite, SIGNAL(buttonRemoved(QChar)), m_buttonSource, SLOT(showButton(QChar)) );
+	connect( m_buttonSource, SIGNAL(dropped(QDropEvent*, QListViewItem*)), m_dropSite, SLOT(removeSelectedButton()) );
+
+	connect( m_dropSite, SIGNAL(changed()), SIGNAL(changed()) );
+
+	// insert all possible buttons into the source (backwards to keep the preferred order...)
+	bool dummy;
+	new ButtonSourceItem(m_buttonSource, getButton('R', dummy) );
+	new ButtonSourceItem(m_buttonSource, getButton('L', dummy) );
+	new ButtonSourceItem(m_buttonSource, getButton('B', dummy) );
+	new ButtonSourceItem(m_buttonSource, getButton('F', dummy) );
+	new ButtonSourceItem(m_buttonSource, getButton('X', dummy) );
+	new ButtonSourceItem(m_buttonSource, getButton('A', dummy) );
+	new ButtonSourceItem(m_buttonSource, getButton('I', dummy) );
+	new ButtonSourceItem(m_buttonSource, getButton('H', dummy) );
+	new ButtonSourceItem(m_buttonSource, getButton('S', dummy) );
+	new ButtonSourceItem(m_buttonSource, getButton('M', dummy) );
+	new ButtonSourceItem(m_buttonSource, getButton('_', dummy) );
+}
+
+ButtonPositionWidget::~ButtonPositionWidget()
+{
+}
+
+void ButtonPositionWidget::setDecorationFactory(KDecorationFactory *factory)
+{
+	if (!factory)
+		return;
+
+	m_factory = factory;
+
+	// get the list of supported buttons
+	if (m_factory->supports(KDecorationDefines::AbilityAnnounceButtons) ) {
+		QString supportedButtons;
+
+		if (m_factory->supports(KDecorationDefines::AbilityButtonMenu) )
+			supportedButtons.append('M');
+		if (m_factory->supports(KDecorationDefines::AbilityButtonOnAllDesktops) )
+			supportedButtons.append('S');
+		if (m_factory->supports(KDecorationDefines::AbilityButtonSpacer) )
+			supportedButtons.append('_');
+		if (m_factory->supports(KDecorationDefines::AbilityButtonHelp) )
+			supportedButtons.append('H');
+		if (m_factory->supports(KDecorationDefines::AbilityButtonMinimize) )
+			supportedButtons.append('I');
+		if (m_factory->supports(KDecorationDefines::AbilityButtonMaximize) )
+			supportedButtons.append('A');
+		if (m_factory->supports(KDecorationDefines::AbilityButtonClose) )
+			supportedButtons.append('X');
+		if (m_factory->supports(KDecorationDefines::AbilityButtonAboveOthers) )
+			supportedButtons.append('F');
+		if (m_factory->supports(KDecorationDefines::AbilityButtonBelowOthers) )
+			supportedButtons.append('B');
+		if (m_factory->supports(KDecorationDefines::AbilityButtonShade) )
+			supportedButtons.append('L');
+		if (m_factory->supports(KDecorationDefines::AbilityButtonResize) )
+			supportedButtons.append('R');
+
+		m_supportedButtons = supportedButtons;
+	} else {
+		// enable only buttons available before AbilityButton* introduction
+		m_supportedButtons = "MSHIAX_";
+	}
+
+	// update the button lists...
+	// 1. set status on the source items...
+	QListViewItemIterator it(m_buttonSource);
+	while (it.current() ) {
+		ButtonSourceItem *i = dynamic_cast<ButtonSourceItem*>(it.current() );
+		if (i) {
+			Button b = i->button();
+			b.supported = m_supportedButtons.contains(b.type);
+			i->setButton(b);
+		}
+		++it;
+	}
+	// 2. rebuild the drop site items...
+	setButtonsLeft(buttonsLeft() );
+	setButtonsRight(buttonsRight() );
+}
+
+Button ButtonPositionWidget::getButton(QChar type, bool& success) {
+	success = true;
+
+	if (type == 'R') {
+		QBitmap bmp(resize_width, resize_height, resize_bits, true);
+		bmp.setMask(bmp);
+		return Button(i18n("Resize"), bmp, 'R', false, m_supportedButtons.contains('R') );
+	} else if (type == 'L') {
+		QBitmap bmp(shade_width, shade_height, shade_bits, true);
+		bmp.setMask(bmp);
+		return Button(i18n("Shade"), bmp, 'L', false, m_supportedButtons.contains('L') );
+	} else if (type == 'B') {
+		QBitmap bmp(keepbelowothers_width, keepbelowothers_height, keepbelowothers_bits, true);
+		bmp.setMask(bmp);
+		return Button(i18n("Keep Below Others"), bmp, 'B', false, m_supportedButtons.contains('B') );
+	} else if (type == 'F') {
+		QBitmap bmp(keepaboveothers_width, keepaboveothers_height, keepaboveothers_bits, true);
+		bmp.setMask(bmp);
+		return Button(i18n("Keep Above Others"), bmp, 'F', false, m_supportedButtons.contains('F') );
+	} else if (type == 'X') {
+		QBitmap bmp(close_width, close_height, close_bits, true);
+		bmp.setMask(bmp);
+		return Button(i18n("Close"), bmp, 'X', false,  m_supportedButtons.contains('X') );
+	} else if (type == 'A') {
+		QBitmap bmp(maximize_width, maximize_height, maximize_bits, true);
+		bmp.setMask(bmp);
+		return Button(i18n("Maximize"), bmp, 'A', false, m_supportedButtons.contains('A') );
+	} else if (type == 'I') {
+		QBitmap bmp(minimize_width, minimize_height, minimize_bits, true);
+		bmp.setMask(bmp);
+		return Button(i18n("Minimize"), bmp, 'I', false, m_supportedButtons.contains('I') );
+	} else if (type == 'H') {
+		QBitmap bmp(help_width, help_height, help_bits, true);
+		bmp.setMask(bmp);
+		return Button(i18n("Help"), bmp, 'H', false, m_supportedButtons.contains('H') );
+	} else if (type == 'S') {
+		QBitmap bmp(onalldesktops_width, onalldesktops_height, onalldesktops_bits, true);
+		bmp.setMask(bmp);
+		return Button(i18n("On All Desktops"), bmp, 'S', false, m_supportedButtons.contains('S') );
+	} else if (type == 'M') {
+		QBitmap bmp(menu_width, menu_height, menu_bits, true);
+		bmp.setMask(bmp);
+		return Button(i18n("Menu"), bmp, 'M', false, m_supportedButtons.contains('M') );
+	} else if (type == '_') {
+		QBitmap bmp(spacer_width, spacer_height, spacer_bits, true);
+		bmp.setMask(bmp);
+		return Button(i18n("--- spacer ---"), bmp, '_', true, m_supportedButtons.contains('_') );
+	} else {
+		success = false;
+		return Button();
+	}
+}
+
+QString ButtonPositionWidget::buttonsLeft() const
+{
+	ButtonList btns = m_dropSite->buttonsLeft;
+	QString btnString = "";
+	for (ButtonList::const_iterator it = btns.begin(); it != btns.end(); ++it) {
+		btnString.append( (*it)->button().type );
+	}
+	return btnString;
+}
+
+QString ButtonPositionWidget::buttonsRight() const
+{
+	ButtonList btns = m_dropSite->buttonsRight;
+	QString btnString = "";
+	for (ButtonList::const_iterator it = btns.begin(); it != btns.end(); ++it) {
+		btnString.append( (*it)->button().type );
+	}
+	return btnString;
+}
+
+void ButtonPositionWidget::setButtonsLeft(const QString &buttons)
+{
+	// to keep the button lists consistent, first remove all left buttons, then add buttons again...
+	m_dropSite->clearLeft();
+
+	for (uint i = 0; i < buttons.length(); ++i) {
+		bool succ = false;
+		Button btn = getButton(buttons[i], succ);
+		if (succ) {
+			m_dropSite->buttonsLeft.append(new ButtonDropSiteItem(btn) );
+			m_buttonSource->hideButton(btn.type);
+		}
+	}
+	m_dropSite->recalcItemGeometry();
+	m_dropSite->update();
+}
+	
+void ButtonPositionWidget::setButtonsRight(const QString &buttons)
+{
+	// to keep the button lists consistent, first remove all left buttons, then add buttons again...
+	m_dropSite->clearRight();
+
+	for (uint i = 0; i < buttons.length(); ++i) {
+		bool succ = false;
+		Button btn = getButton(buttons[i], succ);
+		if (succ) {
+			m_dropSite->buttonsRight.append(new ButtonDropSiteItem(btn) );
+			m_buttonSource->hideButton(btn.type);
+		}
+	}
+	m_dropSite->recalcItemGeometry();
+	m_dropSite->update();
+}
+
+#include "buttons.moc"
+// vim: ts=4
+// kate: space-indent off; tab-width 4;