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breeze/kstyle/breezeshadowhelper.cpp

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//////////////////////////////////////////////////////////////////////////////
// breezeshadowhelper.h
// handle shadow pixmaps passed to window manager via X property
// -------------------
//
// Copyright (c) 2010 Hugo Pereira Da Costa <hugo.pereira@free.fr>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.
//////////////////////////////////////////////////////////////////////////////
#include "breezeshadowhelper.h"
#include "breezeshadowhelper.moc"
#include "breezehelper.h"
#include "breezestyleconfigdata.h"
#include <QDockWidget>
#include <QEvent>
#include <QApplication>
#include <QMenu>
#include <QPainter>
#include <QPixmap>
#include <QToolBar>
#include <QTextStream>
#if HAVE_X11
#include <QX11Info>
#endif
namespace Breeze
{
const char* const ShadowHelper::netWMShadowAtomName( "_KDE_NET_WM_SHADOW" );
const char* const ShadowHelper::netWMForceShadowPropertyName( "_KDE_NET_WM_FORCE_SHADOW" );
const char* const ShadowHelper::netWMSkipShadowPropertyName( "_KDE_NET_WM_SKIP_SHADOW" );
// shadow dimensions
enum
{
Shadow_InternalSize = 15,
Shadow_InternalOffset = 7,
Shadow_Size = (3*Shadow_InternalSize + Shadow_InternalOffset)/2,
Shadow_Overlap = Shadow_Size - Shadow_InternalSize + 2
};
//_____________________________________________________
ShadowHelper::ShadowHelper( QObject* parent, Helper& helper ):
QObject( parent ),
_helper( helper ),
_supported( checkSupported() )
#if HAVE_X11
,_gc( 0 ),
_atom( 0 )
#endif
{}
//_______________________________________________________
ShadowHelper::~ShadowHelper( void )
{
#if HAVE_X11
if( Helper::isX11() )
{ foreach( const uint32_t& value, _pixmaps ) xcb_free_pixmap( Helper::connection(), value ); }
#endif
}
//______________________________________________
void ShadowHelper::reset( void )
{
#if HAVE_X11
if( Helper::isX11() )
{ foreach( const uint32_t& value, _pixmaps ) xcb_free_pixmap( Helper::connection(), value ); }
#endif
_pixmaps.clear();
_shadowTiles = TileSet();
}
//_______________________________________________________
bool ShadowHelper::registerWidget( QWidget* widget, bool force )
{
// do nothing if not supported
if( !_supported ) return false;
// make sure widget is not already registered
if( _widgets.contains( widget ) ) return false;
// check if widget qualifies
if( !( force || acceptWidget( widget ) ) )
{ return false; }
// store in map and add destroy signal connection
widget->removeEventFilter( this );
widget->installEventFilter( this );
_widgets.insert( widget, 0 );
/*
need to install shadow directly when widget "created" state is already set
since WinID changed is never called when this is the case
*/
if( widget->testAttribute(Qt::WA_WState_Created) && installX11Shadows( widget ) )
{ _widgets.insert( widget, widget->winId() ); }
connect( widget, SIGNAL(destroyed(QObject*)), SLOT(objectDeleted(QObject*)) );
return true;
}
//_______________________________________________________
void ShadowHelper::unregisterWidget( QWidget* widget )
{
if( _widgets.remove( widget ) )
{ uninstallX11Shadows( widget ); }
}
//_______________________________________________________
bool ShadowHelper::eventFilter( QObject* object, QEvent* event )
{
// check event type
if( event->type() != QEvent::WinIdChange ) return false;
// cast widget
QWidget* widget( static_cast<QWidget*>( object ) );
// install shadows and update winId
if( installX11Shadows( widget ) )
{ _widgets.insert( widget, widget->winId() ); }
return false;
}
//_______________________________________________________
TileSet ShadowHelper::shadowTiles( void )
{
if( !_shadowTiles.isValid() )
{
const QPalette palette( QApplication::palette() );
const QColor shadowColor( palette.color( QPalette::Shadow ) );
// create pixmap
QPixmap pixmap = QPixmap( Shadow_Size*2, Shadow_Size*2 );
pixmap.fill( Qt::transparent );
// paint
QPainter painter( &pixmap );
painter.setRenderHint( QPainter::Antialiasing );
painter.setCompositionMode(QPainter::CompositionMode_Source);
painter.setPen( Qt::NoPen );
switch( StyleConfigData::lightSource() )
{
case StyleConfigData::LS_TOP: painter.translate( Shadow_InternalOffset/2, Shadow_InternalOffset ); break;
case StyleConfigData::LS_TOPLEFT: painter.translate( Shadow_InternalOffset, Shadow_InternalOffset ); break;
case StyleConfigData::LS_TOPRIGHT: painter.translate( 0, Shadow_InternalOffset ); break;
}
auto gradientStopColor = [](QColor color, qreal alpha) {
color.setAlphaF(alpha);
return color;
};
QRadialGradient radialGradient(Shadow_InternalSize, Shadow_InternalSize, Shadow_InternalSize);
radialGradient.setColorAt(0.0, gradientStopColor( shadowColor, 0.35 ) );
radialGradient.setColorAt(0.25, gradientStopColor( shadowColor, 0.25 ) );
radialGradient.setColorAt(0.5, gradientStopColor( shadowColor, 0.13 ) );
radialGradient.setColorAt(0.75, gradientStopColor( shadowColor, 0.04 ) );
radialGradient.setColorAt(1.0, gradientStopColor( shadowColor, 0.0 ) );
QLinearGradient linearGradient;
linearGradient.setColorAt(0.0, gradientStopColor( shadowColor, 0.35 ) );
linearGradient.setColorAt(0.25, gradientStopColor( shadowColor, 0.25 ) );
linearGradient.setColorAt(0.5, gradientStopColor( shadowColor, 0.13 ) );
linearGradient.setColorAt(0.75, gradientStopColor( shadowColor, 0.04 ) );
linearGradient.setColorAt(1.0, gradientStopColor( shadowColor, 0.0) );
// topLeft
painter.fillRect(QRect(0, 0, Shadow_InternalSize, Shadow_InternalSize), radialGradient);
// top
linearGradient.setStart(Shadow_InternalSize, Shadow_InternalSize);
linearGradient.setFinalStop(Shadow_InternalSize, 0);
painter.fillRect(QRect(Shadow_InternalSize, 0, Shadow_InternalSize, Shadow_InternalSize), linearGradient);
// topRight
radialGradient.setCenter(2*Shadow_InternalSize, Shadow_InternalSize);
radialGradient.setFocalPoint(2*Shadow_InternalSize, Shadow_InternalSize);
painter.fillRect(QRect(2*Shadow_InternalSize, 0, Shadow_InternalSize, Shadow_InternalSize), radialGradient);
// left
linearGradient.setStart(Shadow_InternalSize, Shadow_InternalSize);
linearGradient.setFinalStop(0, Shadow_InternalSize);
painter.fillRect(QRect(0, Shadow_InternalSize, Shadow_InternalSize, Shadow_InternalSize), linearGradient);
// bottom left
radialGradient.setCenter(Shadow_InternalSize, 2*Shadow_InternalSize);
radialGradient.setFocalPoint(Shadow_InternalSize, 2*Shadow_InternalSize);
painter.fillRect(QRect(0, 2*Shadow_InternalSize, Shadow_InternalSize, Shadow_InternalSize), radialGradient);
// bottom
linearGradient.setStart(Shadow_InternalSize, 2*Shadow_InternalSize);
linearGradient.setFinalStop(Shadow_InternalSize, 3*Shadow_InternalSize);
painter.fillRect(QRect(Shadow_InternalSize, 2*Shadow_InternalSize, Shadow_InternalSize, Shadow_InternalSize), linearGradient);
// bottom right
radialGradient.setCenter(2*Shadow_InternalSize, 2*Shadow_InternalSize);
radialGradient.setFocalPoint(2*Shadow_InternalSize, 2*Shadow_InternalSize);
painter.fillRect(QRect(2*Shadow_InternalSize, 2*Shadow_InternalSize, Shadow_InternalSize, Shadow_InternalSize), radialGradient);
// right
linearGradient.setStart(2*Shadow_InternalSize, Shadow_InternalSize);
linearGradient.setFinalStop(3*Shadow_InternalSize, Shadow_InternalSize);
painter.fillRect(QRect(2*Shadow_InternalSize, Shadow_InternalSize, Shadow_InternalSize, Shadow_InternalSize), linearGradient);
painter.end();
// create tiles from pixmap
_shadowTiles = TileSet( pixmap, Shadow_Size, Shadow_Size, Shadow_Size, Shadow_Size, Shadow_Size, Shadow_Size, 1, 1 );
pixmap.save( "shadow.png" );
}
return _shadowTiles;
}
//_______________________________________________________
void ShadowHelper::objectDeleted( QObject* object )
{ _widgets.remove( static_cast<QWidget*>( object ) ); }
//_______________________________________________________
bool ShadowHelper::checkSupported( void ) const
{
// create atom
#if HAVE_X11
// make sure we are on X11
if( !Helper::isX11() ) return false;
// create atom
xcb_atom_t netSupportedAtom( _helper.createAtom( "_NET_SUPPORTED" ) );
if( !netSupportedAtom ) return false;
// store connection locally
xcb_connection_t* connection( Helper::connection() );
// get property
const uint32_t maxLength = std::string().max_size();
xcb_get_property_cookie_t cookie( xcb_get_property( connection, 0, QX11Info::appRootWindow(), netSupportedAtom, XCB_ATOM_ATOM, 0, (maxLength+3) / 4 ) );
ScopedPointer<xcb_get_property_reply_t> reply( xcb_get_property_reply( connection, cookie, nullptr ) );
if( !reply ) return false;
// get reply length and data
const int count( xcb_get_property_value_length( reply.data() )/sizeof( xcb_atom_t ) );
xcb_atom_t *atoms = reinterpret_cast<xcb_atom_t*>( xcb_get_property_value( reply.data() ) );
bool found( false );
for( int i = 0; i < count && !found; ++i )
{
// get atom name and print
xcb_atom_t atom( atoms[i] );
xcb_get_atom_name_cookie_t cookie( xcb_get_atom_name( connection, atom ) );
ScopedPointer<xcb_get_atom_name_reply_t> reply( xcb_get_atom_name_reply( connection, cookie, 0 ) );
if( !reply ) continue;
// get name and compare
const QString name( QByteArray( xcb_get_atom_name_name( reply.data() ), xcb_get_atom_name_name_length( reply.data() ) ) );
if( strcmp( netWMShadowAtomName, xcb_get_atom_name_name( reply.data() ) ) == 0 ) found = true;
}
return found;
#else
return false;
#endif
}
//_______________________________________________________
bool ShadowHelper::isMenu( QWidget* widget ) const
{ return qobject_cast<QMenu*>( widget ); }
//_______________________________________________________
bool ShadowHelper::isToolTip( QWidget* widget ) const
{ return widget->inherits( "QTipLabel" ) || (widget->windowFlags() & Qt::WindowType_Mask) == Qt::ToolTip; }
//_______________________________________________________
bool ShadowHelper::isDockWidget( QWidget* widget ) const
{ return qobject_cast<QDockWidget*>( widget ); }
//_______________________________________________________
bool ShadowHelper::isToolBar( QWidget* widget ) const
{ return qobject_cast<QToolBar*>( widget ); }
//_______________________________________________________
bool ShadowHelper::acceptWidget( QWidget* widget ) const
{
// flags
if( widget->property( netWMSkipShadowPropertyName ).toBool() ) return false;
if( widget->property( netWMForceShadowPropertyName ).toBool() ) return true;
// menus
if( isMenu( widget ) ) return true;
// combobox dropdown lists
if( widget->inherits( "QComboBoxPrivateContainer" ) ) return true;
// tooltips
if( isToolTip( widget ) && !widget->inherits( "Plasma::ToolTip" ) )
{ return true; }
// detached widgets
if( isDockWidget( widget ) || isToolBar( widget ) )
{ return true; }
// reject
return false;
}
//______________________________________________
const QVector<uint32_t>& ShadowHelper::createPixmapHandles( void )
{
/**
shadow atom and property specification available at
http://community.kde.org/KWin/Shadow
*/
// create atom
#if HAVE_X11
if( !_atom && Helper::isX11() ) _atom = _helper.createAtom( QLatin1String( netWMShadowAtomName ) );
#endif
shadowTiles();
// make sure size is valid
if( _pixmaps.empty() && _shadowTiles.isValid() )
{
_pixmaps.push_back( createPixmap( _shadowTiles.pixmap( 1 ) ) );
_pixmaps.push_back( createPixmap( _shadowTiles.pixmap( 2 ) ) );
_pixmaps.push_back( createPixmap( _shadowTiles.pixmap( 5 ) ) );
_pixmaps.push_back( createPixmap( _shadowTiles.pixmap( 8 ) ) );
_pixmaps.push_back( createPixmap( _shadowTiles.pixmap( 7 ) ) );
_pixmaps.push_back( createPixmap( _shadowTiles.pixmap( 6 ) ) );
_pixmaps.push_back( createPixmap( _shadowTiles.pixmap( 3 ) ) );
_pixmaps.push_back( createPixmap( _shadowTiles.pixmap( 0 ) ) );
}
// return relevant list of pixmap handles
return _pixmaps;
}
//______________________________________________
uint32_t ShadowHelper::createPixmap( const QPixmap& source )
{
// do nothing for invalid pixmaps
if( source.isNull() ) return 0;
if( !Helper::isX11() ) return 0;
/*
in some cases, pixmap handle is invalid. This is the case notably
when Qt uses to RasterEngine. In this case, we create an X11 Pixmap
explicitly and draw the source pixmap on it.
*/
#if HAVE_X11
const int width( source.width() );
const int height( source.height() );
// create X11 pixmap
xcb_pixmap_t pixmap = xcb_generate_id( Helper::connection() );
xcb_create_pixmap( Helper::connection(), 32, pixmap, QX11Info::appRootWindow(), width, height );
// create gc
if( !_gc )
{
_gc = xcb_generate_id( Helper::connection() );
xcb_create_gc( Helper::connection(), _gc, pixmap, 0, 0x0 );
}
// create image from QPixmap and assign to pixmap
QImage image( source.toImage() );
xcb_put_image( Helper::connection(), XCB_IMAGE_FORMAT_Z_PIXMAP, pixmap, _gc, image.width(), image.height(), 0, 0, 0, 32, image.byteCount(), image.constBits());
return pixmap;
#else
return 0;
#endif
}
//_______________________________________________________
bool ShadowHelper::installX11Shadows( QWidget* widget )
{
// do nothing if not supported
if( !_supported ) return false;
// check widget and shadow
if( !widget ) return false;
if( !Helper::isX11() ) return false;
#if HAVE_X11
#ifndef QT_NO_XRENDER
// TODO: also check for NET_WM_SUPPORTED atom, before installing shadow
/*
From bespin code. Supposibly prevent playing with some 'pseudo-widgets'
that have winId matching some other -random- window
*/
if( !(widget->testAttribute(Qt::WA_WState_Created) || widget->internalWinId() ))
{ return false; }
// create pixmap handles if needed
const QVector<uint32_t>& pixmaps( createPixmapHandles() );
if( pixmaps.size() != numPixmaps ) return false;
// create data
// add pixmap handles
QVector<uint32_t> data;
foreach( const uint32_t& value, pixmaps )
{ data.push_back( value ); }
// add padding
/*
in most cases all 4 paddings are identical, since offsets are handled when generating the pixmaps.
There is one extra pixel needed with respect to actual shadow size, to deal with how
menu backgrounds are rendered.
Some special care is needed for QBalloonTip, since the later have an arrow
*/
// also need to decrement default size further due to extra hard coded round corner
int size = Shadow_Size - Shadow_Overlap;
if( isToolTip( widget ) )
{
if( widget->inherits( "QBalloonTip" ) )
{
// balloon tip needs special margins to deal with the arrow
int top = 0;
int bottom = 0;
widget->getContentsMargins(NULL, &top, NULL, &bottom );
// also need to decrement default size further due to extra hard coded round corner
size -= 2;
// it seems arrow can be either to the top or the bottom. Adjust margins accordingly
if( top > bottom ) data << size - (top - bottom) << size << size << size;
else data << size << size << size - (bottom - top) << size;
} else {
data << size << size << size << size;
}
} else {
data << size << size << size << size;
}
xcb_change_property( Helper::connection(), XCB_PROP_MODE_REPLACE, widget->winId(), _atom, XCB_ATOM_CARDINAL, 32, data.size(), data.constData() );
xcb_flush( Helper::connection() );
return true;
#endif
#endif
return false;
}
//_______________________________________________________
void ShadowHelper::uninstallX11Shadows( QWidget* widget ) const
{
#if HAVE_X11
if( !_supported ) return;
if( !Helper::isX11() ) return;
if( !( widget && widget->testAttribute(Qt::WA_WState_Created) ) ) return;
xcb_delete_property( Helper::connection(), widget->winId(), _atom);
#else
Q_UNUSED( widget )
#endif
}
}