1 files changed, 358 insertions, 0 deletions
diff --git a/kexi/widget/utils/kexigradientwidget.cpp b/kexi/widget/utils/kexigradientwidget.cpp
new file mode 100644
index 000000000..0411318de
--- /dev/null
+++ b/kexi/widget/utils/kexigradientwidget.cpp
@@ -0,0 +1,358 @@
+/* This file is part of the KDE project
+   Copyright (C) 2005 Christian Nitschkowski <segfault_ii@web.de>
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public License
+   along with this program; see the file COPYING.  If not, write to
+   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+*/
+
+#include <qapplication.h>
+#include <qbitmap.h>
+#include <qimage.h>
+#include <qobjectlist.h>
+#include <qpainter.h>
+#include <qstyle.h>
+
+#include <kimageeffect.h>
+#include <kpixmap.h>
+
+#include "kexigradientwidget.h"
+
+KexiGradientWidget::KexiGradientWidget( QWidget *parent, const char *name, WFlags f )
+	: QWidget( parent, name, f ), p_displayMode( NoGradient ),
+	p_gradientType( VerticalGradient ),
+	p_color1( Qt::white ), p_color2( Qt::blue ), p_currentChild( 0 ),
+	p_opacity( 0.5 ), p_cacheDirty( true )
+{
+	p_customBackgroundWidgets.setAutoDelete( false );
+	p_knownWidgets.setAutoDelete( false );
+
+	p_backgroundColor = QWidget::paletteBackgroundColor();
+
+	connect ( &p_rebuildDelayTimer, SIGNAL( timeout() ), this, SLOT( setCacheDirty() ) );
+
+	installEventFilter( this );
+}
+
+KexiGradientWidget::~KexiGradientWidget()
+{
+}
+
+bool KexiGradientWidget::isValidChildWidget( QObject* child ) {
+	const QWidget* wgt = dynamic_cast<QWidget*>( child );
+
+	if ( wgt == 0L )
+		return false;
+
+	if ( wgt->inherits( "QScrollView" ) )
+		return false;
+	if ( wgt->inherits( "QComboBox" ) )
+		return false;
+	if ( wgt->inherits( "QLineEdit" ) )
+		return false;
+	if ( wgt->inherits( "KexiDBForm" ) )
+		return false;
+
+	return true;
+}
+
+void KexiGradientWidget::buildChildrenList( WidgetList& list, QWidget* p ) {
+	QObjectList* objects = p->queryList( "QWidget", 0, false, false );
+
+	for ( QObjectList::Iterator it = objects->begin(); it != objects->end(); ++it ) {
+		if ( isValidChildWidget( ( *it ) ) == false )
+			continue;
+		list.append( dynamic_cast<QWidget*>( ( *it ) ) );
+		buildChildrenList( list, dynamic_cast<QWidget*>( ( *it ) ) );
+	}
+
+	delete objects;
+}
+
+void KexiGradientWidget::rebuildCache( void ) {
+	WidgetList childWidgetList;
+	buildChildrenList( childWidgetList, this );
+
+	/**
+	Disable the effect and behave like a normal QWidget.
+	*/
+	if ( p_displayMode == NoGradient ) {
+//		if ( p_backgroundPixmap.isNull() ) {
+			//unsetPalette();
+		//} else {
+			QWidget::setPaletteBackgroundPixmap( p_backgroundPixmap );
+		//}
+		QWidget::setPaletteBackgroundColor( p_backgroundColor );
+
+		for ( WidgetList::Iterator it = childWidgetList.begin();
+			it != childWidgetList.end(); ++it ) {
+
+			if ( p_customBackgroundWidgets.contains( ( *it ) ) == false ) {
+				( *it )->unsetPalette();
+			}
+		}
+		/**
+		The cache is now in a current state.
+		*/
+		p_cacheDirty = false;
+		return;
+	}
+
+	KPixmap tempPixmap;
+	QImage gradientImage;
+	QImage bgImage;
+
+	/**
+	Draw the gradient
+	*/
+	gradientImage = KImageEffect::gradient( size(), p_color1, p_color2,
+		(KImageEffect::GradientType)p_gradientType );
+
+	/**
+	Draw the widget-background in a pixmap and fade it with the gradient.
+	*/
+	if ( p_displayMode == FadedGradient ) {
+		tempPixmap.resize( size() );
+		QPainter p( &tempPixmap, this );
+
+		if ( p_backgroundPixmap.isNull() ) {
+			/*
+			Need to unset the palette, otherwise the old gradient
+			will be used as a background, not the widget's default bg.
+			*/
+			unsetPalette();
+			p.fillRect( 0, 0, width(), height(), palette().brush(
+				isEnabled() ? QPalette::Active : QPalette::Disabled,
+				QColorGroup::Background ) );
+		} else {
+			p.drawTiledPixmap( 0, 0, width(), height(), p_backgroundPixmap );
+		}
+
+		p.end();
+
+		bgImage = tempPixmap;
+
+		KImageEffect::blend( gradientImage, bgImage, (float)p_opacity );
+
+		tempPixmap.convertFromImage( bgImage );
+	} else if ( p_displayMode == SimpleGradient ) {
+	/**
+	Use the gradient as the final background-pixmap
+	if displaymode is set to SimpleGradient.
+	*/
+		tempPixmap.convertFromImage( gradientImage );
+	}
+
+	/**
+	All children need to have our background set.
+	*/
+	KPixmap partPixmap;
+	QRect area;
+	QWidget* childWidget = 0;
+	const QPoint topLeft( 0, 0 );
+
+	for ( WidgetList::Iterator it = childWidgetList.begin();
+		it != childWidgetList.end(); ++it ) {
+
+		childWidget = ( *it );
+
+		/**
+		Exclude widgets with a custom palette.
+		*/
+		if ( p_customBackgroundWidgets.contains( childWidget ) ) {
+			continue;
+		}
+
+		partPixmap.resize( childWidget->size() );
+		/**
+		Get the part of the tempPixmap that is
+		under the current child-widget.
+		*/
+		if ( childWidget->parent() == this ) {
+			area = childWidget->geometry();
+		} else {
+			area.setTopLeft( childWidget->mapTo( this,
+				childWidget->clipRegion().boundingRect().topLeft() ) );
+			area.setSize( childWidget->size() );
+		}
+		bitBlt( &partPixmap, topLeft, &tempPixmap, area );
+
+		p_currentChild = childWidget;
+		childWidget->setPaletteBackgroundPixmap( partPixmap );
+	}
+
+	QWidget::setPaletteBackgroundPixmap( tempPixmap );
+	/**
+	Unset the dirty-flag at the end of the method.
+	QWidget::setPaletteBackgroundPixmap() causes this
+	to get set to true again, so set it to false
+	right after setting the pixmap.
+	*/
+	p_cacheDirty = false;
+}
+
+void KexiGradientWidget::paintEvent( QPaintEvent* e ) {
+	/**
+	Rebuild the background-pixmap if necessary.
+	*/
+	if ( p_cacheDirty == true ) {
+		rebuildCache();
+	}
+
+	/**
+	Draw the widget as usual
+	*/
+	QWidget::paintEvent( e );
+}
+
+bool KexiGradientWidget::eventFilter( QObject* object, QEvent* event ) {
+	QWidget* child = dynamic_cast<QWidget*>( object );
+
+	/**
+	Manage list of child-widgets.
+	*/
+	if ( object == this ) {
+		if ( event->type() == QEvent::ChildInserted ) {
+			child = dynamic_cast<QWidget*>( dynamic_cast<QChildEvent*>( event )->child() );
+			if ( isValidChildWidget( child ) == false ) {
+				return false;
+			}
+			/**
+			Add the new child-widget to our list of known widgets.
+			*/
+			p_knownWidgets.append( child );
+			/**
+			... and install 'this' as the child's event-filter.
+			*/
+			child->installEventFilter( this );
+		} else if ( event->type() == QEvent::ChildRemoved ) {
+			/**
+			Remove the child-widget from the list of known widgets.
+			*/
+			p_knownWidgets.remove( dynamic_cast<QWidget*>( dynamic_cast<QChildEvent*>( event )->child() ) );
+		}
+		return false;
+	}
+
+	/**
+	Manage custombackground-list.
+	*/
+	if ( event->type() == QEvent::PaletteChange ) {
+		/**
+		p_currentChild will be == 0L, when the user
+		sets it's palette manually.
+		In this case, it has to be added to the customBackground-list.
+		*/
+		if ( p_currentChild == 0L && child != 0L ) {
+			if ( p_customBackgroundWidgets.contains( child ) == false ) {
+				p_customBackgroundWidgets.append( child );
+				return false;
+			}
+		}
+		/**
+		Check if the widget whose PaletteChange-event we handle
+		isn't the widget we set the background in rebuildCache().
+		*/
+		if ( child != p_currentChild && child != 0L ) {
+			/**
+			Add the new child to the list of widgets, we don't set
+			the background ourselves if it isn't in the list.
+			*/
+			if ( p_customBackgroundWidgets.contains( child ) == false ) {
+				if ( child->paletteBackgroundPixmap() != 0L ) {
+					p_customBackgroundWidgets.append( child );
+				}
+			} else {
+				/**
+				If the palette is now the default-palette again,
+				remove it from the "don't set background in rebuildCache()"-list
+				and rebuild the cache, so it again will get the gradient background.
+				*/
+				if ( child->paletteBackgroundPixmap() == 0L ) {
+					p_customBackgroundWidgets.remove( child );
+					if ( p_displayMode != NoGradient ) {
+						p_cacheDirty = true;
+					}
+				}
+			}
+		}
+		p_currentChild = 0;
+	}
+
+	if ( event->type() == QEvent::Move ) {
+		if ( p_customBackgroundWidgets.contains( child ) == false ) {
+			updateChildBackground( child );
+		}
+	}
+	return false;
+}
+
+void KexiGradientWidget::updateChildBackground( QWidget* childWidget )
+{
+	KPixmap partPixmap;
+	KPixmap bgPixmap;
+	QRect area;
+	const QPoint topLeft( 0, 0 );
+
+	bgPixmap = paletteBackgroundPixmap() ? (*paletteBackgroundPixmap()) : QPixmap();
+	if ( bgPixmap.isNull() )
+		return;
+
+	/**
+	Exclude widgtes that don't have a parent.
+	This happens when children are removed
+	which are in the knownWidgets-list.
+	*/
+	if ( childWidget->parent() == 0L )
+		return;
+
+	/**
+	Exclude widgets with a custom palette.
+	*/
+	if ( p_customBackgroundWidgets.contains( childWidget ) ) {
+		return;
+	}
+
+	partPixmap.resize( childWidget->size() );
+	/**
+	Get the part of the tempPixmap that is
+	under the current child-widget.
+	*/
+	if ( childWidget->parent() == this ) {
+		area = childWidget->geometry();
+	} else {
+		area.setTopLeft( childWidget->mapTo( this,
+			childWidget->clipRegion().boundingRect().topLeft() ) );
+		area.setSize( childWidget->size() );
+	}
+	bitBlt( &partPixmap, topLeft, &bgPixmap, area );
+
+	p_currentChild = childWidget;
+	childWidget->setPaletteBackgroundPixmap( partPixmap );
+}
+
+void KexiGradientWidget::setPaletteBackgroundColor( const QColor& color )
+{
+	p_backgroundColor = color;
+	if ( p_displayMode == NoGradient ) {
+		QWidget::setPaletteBackgroundColor( p_backgroundColor );
+	}
+}
+
+const QColor& KexiGradientWidget::paletteBackgroundColor() const
+{
+	return p_backgroundColor;
+}
+
+#include "kexigradientwidget.moc"