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tdegraphics/kghostview/kgvpageview.cpp

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/**
* 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 <tqdatetime.h>
#include <kdebug.h>
#include "kgvpageview.h"
KGVPageView::KGVPageView( TQWidget* parent, const char* name )
: TQScrollView( parent, name )
{
_page = 0;
setFocusPolicy( TQWidget::StrongFocus );
viewport()->setFocusPolicy( TQWidget::WheelFocus );
}
void KGVPageView::setPage( TQWidget* 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( TQObject* o, TQEvent* e )
{
if ( o == _page && e->type() == TQEvent::Resize ) {
// We need to call TQScrollView::eventFilter before centerContents,
// otherwise a loop will be introduced.
bool result = TQScrollView::eventFilter( o, e );
centerContents();
emit pageSizeChanged( _page->size() );
return result;
}
return TQScrollView::eventFilter( o, e );
}
void KGVPageView::wheelEvent( TQWheelEvent *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
TQScrollView::wheelEvent( e );
}
void KGVPageView::mousePressEvent( TQMouseEvent * 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( TQMouseEvent *e )
{
if ( e -> button() & LeftButton )
{
setCursor( arrowCursor );
}
}
void KGVPageView::mouseMoveEvent( TQMouseEvent * e )
{
if ( e->state() & LeftButton )
{
TQPoint 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( TQKeyEvent* 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( TQResizeEvent* e )
{
TQScrollView::viewportResizeEvent( e );
emit viewSizeChanged( viewport()->size() );
centerContents();
}
void KGVPageView::centerContents()
{
if( !_page )
return;
int newX = 0;
int newY = 0;
TQSize 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