1 files changed, 213 insertions, 0 deletions
diff --git a/src/gvcore/imageviewtools.cpp b/src/gvcore/imageviewtools.cpp
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+++ b/src/gvcore/imageviewtools.cpp
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+// vim: set tabstop=4 shiftwidth=4 noexpandtab
+/*
+Gwenview - A simple image viewer for KDE
+Copyright 2000-2004 Aurélien Gāteau
+
+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