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/kdegraphics@1054174 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

1 files changed, 254 insertions, 0 deletions

diff --git a/kghostview/kgvpageview.cpp b/kghostview/kgvpageview.cpp
new file mode 100644
index 00000000..8a8af585
--- /dev/null
+++ b/kghostview/kgvpageview.cpp
@@ -0,0 +1,254 @@
+/** 
+ * Copyright (C) 2001-2002 the KGhostView authors. See file AUTHORS.
+ * 	
+ * 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 <qdatetime.h>
+
+#include <kdebug.h>
+
+#include "kgvpageview.h"
+
+KGVPageView::KGVPageView( QWidget* parent, const char* name )
+  : QScrollView( parent, name )
+{
+    _page = 0;
+
+    setFocusPolicy( QWidget::StrongFocus );
+    viewport()->setFocusPolicy( QWidget::WheelFocus );
+}
+
+void KGVPageView::setPage( QWidget* page )
+{
+    if( page != 0 ) {
+	addChild( page );
+	centerContents();
+	_page = page;
+    }
+}
+
+bool KGVPageView::atTop() const
+{
+    return verticalScrollBar()->value() == verticalScrollBar()->minValue();
+}
+
+bool KGVPageView::atBottom() const 
+{
+    return verticalScrollBar()->value() == verticalScrollBar()->maxValue();
+}
+
+bool KGVPageView::eventFilter( QObject* o, QEvent* e )
+{
+    if ( o == _page &&  e->type() == QEvent::Resize ) {
+	// We need to call QScrollView::eventFilter before centerContents,
+	// otherwise a loop will be introduced.
+	bool result = QScrollView::eventFilter( o, e );
+	centerContents();
+	emit pageSizeChanged( _page->size() );
+	return result;
+    }
+    return QScrollView::eventFilter( o, e );
+}
+
+
+void KGVPageView::wheelEvent( QWheelEvent *e )
+{
+    int delta = e->delta();
+    e->accept();
+    if ((e->state() & ControlButton) == ControlButton) {
+	if ( e->delta() < 0 )
+	    emit zoomOut();
+	else
+	    emit zoomIn();
+    }
+    else if ( delta <= -120 && atBottom() )
+    {
+	emit ReadDown();
+    }
+    else if ( delta >= 120 && atTop())
+    {
+	emit ReadUp();
+    }
+
+    else
+        QScrollView::wheelEvent( e );
+}
+void KGVPageView::mousePressEvent( QMouseEvent * e )
+{
+    if ( e->button() & LeftButton )
+    {
+	_dragGrabPos = e -> globalPos();
+	setCursor( sizeAllCursor );
+    }
+    else if ( e->button() & MidButton )
+    {
+	emit ReadDown();
+    }
+    else if ( e -> button() & RightButton )
+    {
+	emit rightClick();
+    }
+}
+
+void KGVPageView::mouseReleaseEvent( QMouseEvent *e )
+{
+    if ( e -> button() & LeftButton )
+    {
+	setCursor( arrowCursor );
+    }
+}
+
+void KGVPageView::mouseMoveEvent( QMouseEvent * e )
+{
+    if ( e->state() & LeftButton )
+    {
+	QPoint delta = _dragGrabPos - e->globalPos();
+	scrollBy( delta.x(), delta.y() );
+	_dragGrabPos = e->globalPos();
+    }
+}
+
+bool KGVPageView::readUp()
+{
+    if( atTop() )
+	return false;
+    else {
+	int newValue = QMAX( verticalScrollBar()->value() - height() + 50,
+			     verticalScrollBar()->minValue() );
+
+	/*
+	int step = 10;
+	int value = verticalScrollBar()->value();
+	while( value > newValue - step ) {
+	    verticalScrollBar()->setValue( value );
+	    value -= step;
+	}
+	*/
+			     
+	verticalScrollBar()->setValue( newValue );
+	return true;
+    }
+}
+
+bool KGVPageView::readDown()
+{   
+    if( atBottom() )
+	return false;
+    else {
+	int newValue = QMIN( verticalScrollBar()->value() + height() - 50,
+			     verticalScrollBar()->maxValue() );
+	
+	/*
+	int step = 10;
+	int value = verticalScrollBar()->value();
+	while( value < newValue + step ) {
+	    verticalScrollBar()->setValue( value );
+	    value += step;
+	}
+	*/
+	    
+	verticalScrollBar()->setValue( newValue );
+	return true;
+    }
+}
+
+void KGVPageView::scrollRight()
+{
+    horizontalScrollBar()->addLine();
+}
+
+void KGVPageView::scrollLeft()
+{
+    horizontalScrollBar()->subtractLine();
+}
+
+void KGVPageView::scrollDown()
+{
+    verticalScrollBar()->addLine();
+}
+
+void KGVPageView::scrollUp()
+{
+    verticalScrollBar()->subtractLine();
+}
+
+void KGVPageView::scrollBottom()
+{
+    verticalScrollBar()->setValue( verticalScrollBar()->maxValue() );
+}
+
+void KGVPageView::scrollTop()
+{
+    verticalScrollBar()->setValue( verticalScrollBar()->minValue() );
+}
+
+void KGVPageView::enableScrollBars( bool b )
+{
+    setHScrollBarMode( b ? Auto : AlwaysOff );
+    setVScrollBarMode( b ? Auto : AlwaysOff );
+}
+
+void KGVPageView::keyPressEvent( QKeyEvent* e )
+{
+    switch ( e->key() ) {
+    case Key_Up:
+	scrollUp();
+	break;
+    case Key_Down:
+	scrollDown();
+	break;
+    case Key_Left:
+	scrollLeft();
+	break;
+    case Key_Right:
+	scrollRight();
+	break;
+    default:
+	e->ignore();
+	return;
+    }
+    e->accept();
+}
+
+void KGVPageView::viewportResizeEvent( QResizeEvent* e )
+{
+    QScrollView::viewportResizeEvent( e );
+    emit viewSizeChanged( viewport()->size() );
+    centerContents();
+}
+
+void KGVPageView::centerContents()
+{
+    if( !_page ) 
+	return;
+
+    int newX = 0;
+    int newY = 0;
+
+    QSize newViewportSize = viewportSize( _page->width(),
+					  _page->height() );
+
+    if( newViewportSize.width() > _page->width() )
+	newX = ( newViewportSize.width() - _page->width() )/2;
+    if( newViewportSize.height() > _page->height() )
+	newY = ( newViewportSize.height() - _page->height() )/2;
+
+    moveChild( _page, newX, newY );
+}
+
+#include "kgvpageview.moc"
+
+// vim:sw=4:sts=4:ts=8:noet