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// vim: set tabstop=4 shiftwidth=4 noexpandtab
/*
Gwenview - A simple image viewer for KDE
Copyright 2000-2004 Aurélien Gâteau
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
// Our header
#include "imageviewtools.h"
// KDE
#include <kaction.h>
#include <kdebug.h>
#include <klocale.h>
#include <kstandarddirs.h>
// Local
#include "imageviewconfig.h"
namespace Gwenview {
// Helper function
static QCursor loadCursor(const QString& name) {
QString path;
path=locate("data", QString("gwenview/cursors/%1.png").arg(name));
return QCursor(QPixmap(path));
}
//----------------------------------------------------------------------------
//
// ImageView::ToolBase
//
//----------------------------------------------------------------------------
ImageView::ToolBase::ToolBase(ImageView* view)
: mView(view) {}
ImageView::ToolBase::~ToolBase() {}
void ImageView::ToolBase::mouseMoveEvent(QMouseEvent*) {}
void ImageView::ToolBase::leftButtonPressEvent(QMouseEvent*) {}
void ImageView::ToolBase::leftButtonReleaseEvent(QMouseEvent*) {}
void ImageView::ToolBase::midButtonReleaseEvent(QMouseEvent*) {
mView->zoomToFit()->activate();
}
void ImageView::ToolBase::rightButtonPressEvent(QMouseEvent* event) {
emit mView->requestContextMenu(event->globalPos());
}
void ImageView::ToolBase::rightButtonReleaseEvent(QMouseEvent*) {
}
void ImageView::ToolBase::wheelEvent(QWheelEvent* event) {
event->accept();
}
void ImageView::ToolBase::updateCursor() {
mView->viewport()->setCursor(ArrowCursor);
}
//----------------------------------------------------------------------------
//
// ImageView::ZoomTool
//
//----------------------------------------------------------------------------
ImageView::ZoomTool::ZoomTool(ImageView* view)
: ImageView::ToolBase(view) {
mZoomCursor=loadCursor("zoom");
}
void ImageView::ZoomTool::zoomTo(const QPoint& pos, bool in) {
if (!mView->canZoom(in)) return;
QPoint centerPos=QPoint(mView->visibleWidth(), mView->visibleHeight())/2;
// Compute image position
QPoint imgPos=mView->viewportToContents(pos) - mView->offset();
double newZoom=mView->computeZoom(in);
imgPos*=newZoom/mView->zoom();
imgPos=imgPos-pos+centerPos;
mView->setZoom(newZoom, imgPos.x(), imgPos.y());
}
void ImageView::ZoomTool::leftButtonReleaseEvent(QMouseEvent* event) {
zoomTo(event->pos(), true);
}
void ImageView::ZoomTool::wheelEvent(QWheelEvent* event) {
zoomTo(event->pos(), event->delta()>0);
event->accept();
}
void ImageView::ZoomTool::rightButtonPressEvent(QMouseEvent*) {
}
void ImageView::ZoomTool::rightButtonReleaseEvent(QMouseEvent* event) {
zoomTo(event->pos(), false);
}
void ImageView::ZoomTool::updateCursor() {
mView->viewport()->setCursor(mZoomCursor);
}
QString ImageView::ZoomTool::hint() const {
return i18n("Left click to zoom in, right click to zoom out. You can also use the mouse wheel.");
}
//----------------------------------------------------------------------------
//
// ImageView::ScrollTool
//
//----------------------------------------------------------------------------
ImageView::ScrollTool::ScrollTool(ImageView* view)
: ImageView::ToolBase(view)
, mScrollStartX(0), mScrollStartY(0)
, mDragStarted(false) {
}
void ImageView::ScrollTool::leftButtonPressEvent(QMouseEvent* event) {
mScrollStartX=event->x();
mScrollStartY=event->y();
mView->viewport()->setCursor(SizeAllCursor);
mDragStarted=true;
}
void ImageView::ScrollTool::mouseMoveEvent(QMouseEvent* event) {
if (!mDragStarted) return;
int deltaX,deltaY;
deltaX=mScrollStartX - event->x();
deltaY=mScrollStartY - event->y();
mScrollStartX=event->x();
mScrollStartY=event->y();
mView->scrollBy(deltaX,deltaY);
}
void ImageView::ScrollTool::leftButtonReleaseEvent(QMouseEvent*) {
if (!mDragStarted) return;
mDragStarted=false;
mView->viewport()->setCursor(ArrowCursor);
}
void ImageView::ScrollTool::wheelEvent(QWheelEvent* event) {
if (ImageViewConfig::mouseWheelScroll()) {
int deltaX, deltaY;
if (event->state() & AltButton || event->orientation()==Horizontal) {
deltaX = event->delta();
deltaY = 0;
} else {
deltaX = 0;
deltaY = event->delta();
}
mView->scrollBy(-deltaX, -deltaY);
} else {
if (event->delta()<0) {
mView->emitSelectNext();
} else {
mView->emitSelectPrevious();
}
}
event->accept();
}
void ImageView::ScrollTool::updateCursor() {
if (mDragStarted) {
mView->viewport()->setCursor(SizeAllCursor);
} else {
mView->viewport()->setCursor(ArrowCursor);
}
}
QString ImageView::ScrollTool::hint() const {
return i18n("Drag to move the image, middle-click to toggle auto-zoom. Hold the Control key to switch to the zoom tool.");
}
} // namespace
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