File indexing completed on 2024-05-12 16:30:49

 /* This file is part of the KDE project
  * Copyright (C) 2008,2010 Jan Hambrecht <jaham@gmx.net>
  * Copyright (C) 2010 Boudewijn Rempt <boud@kogmbh.com>
  *
  * This library 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 library 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 library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 #include "KarbonZoomController.h"
 
 #include <KarbonCanvas.h>
 #include <KoZoomAction.h>
 #include <KoCanvasController.h>
 #include <KoCanvasBase.h>
 #include <KoZoomHandler.h>
 #include <KoCanvasResourceManager.h>
 #include <KoShapeManager.h>
 #include <KoSelection.h>
 
 #include <kactioncollection.h>
 #include <klocalizedstring.h>
 
 #include <math.h>
 
 class KarbonZoomController::Private
 {
 public:
     Private()
             : canvasController(0), canvas(0), zoomHandler(0), action(0)
             , fitMargin(25)
     {
     }
 
     ~Private()
     {
         delete action;
     }
 
     KoCanvasController * canvasController;
     KarbonCanvas * canvas;
     KoZoomHandler * zoomHandler;
     KoZoomAction * action;
     QSizeF pageSize;
     int fitMargin;
 };
 
 KarbonZoomController::KarbonZoomController(KoCanvasController *controller, KActionCollection *actionCollection, QObject *parent)
         : QObject(parent), d(new Private())
 {
     d->canvasController = controller;
 
     d->action = new KoZoomAction(KoZoomMode::ZOOM_WIDTH | KoZoomMode::ZOOM_PAGE, i18n("Zoom"), this);
     d->action->setSpecialButtons(KoZoomAction::ZoomToSelection | KoZoomAction::ZoomToAll);
     connect(d->action, SIGNAL(zoomChanged(KoZoomMode::Mode,qreal)),
             this, SLOT(setZoom(KoZoomMode::Mode,qreal)));
     connect(d->action, SIGNAL(zoomedToSelection()),
             this, SIGNAL(zoomedToSelection()));
     connect(d->action, SIGNAL(zoomedToAll()),
             this, SIGNAL(zoomedToAll()));
 
     actionCollection->addAction("view_zoom", d->action);
     actionCollection->addAction(KStandardAction::ZoomIn, "zoom_in", this, SLOT(zoomInRelative()));
     actionCollection->addAction(KStandardAction::ZoomOut, "zoom_out", this, SLOT(zoomOutRelative()));
 
     d->canvas = dynamic_cast<KarbonCanvas*>(d->canvasController->canvas());
     d->zoomHandler = dynamic_cast<KoZoomHandler*>(const_cast<KoViewConverter*>(d->canvas->viewConverter()));
 
     connect(d->canvasController->proxyObject, SIGNAL(sizeChanged(QSize)), this, SLOT(setAvailableSize()));
     connect(d->canvasController->proxyObject, SIGNAL(zoomRelative(qreal,QPointF)), this, SLOT(requestZoomRelative(qreal,QPointF)));
     connect(d->canvasController->proxyObject, SIGNAL(moveDocumentOffset(QPoint)),
             d->canvas, SLOT(setDocumentOffset(QPoint)));
 
     connect(d->canvas->resourceManager(), SIGNAL(canvasResourceChanged(int,QVariant)),
             this, SLOT(canvasResourceChanged(int,QVariant)));
 }
 
 KarbonZoomController::~KarbonZoomController()
 {
     delete d;
 }
 
 KoZoomAction * KarbonZoomController::zoomAction() const
 {
     return d->action;
 }
 
 void KarbonZoomController::setZoomMode(KoZoomMode::Mode mode)
 {
     setZoom(mode, 1.0);
 }
 
 void KarbonZoomController::setZoom(KoZoomMode::Mode mode, qreal zoom)
 {
     setZoom(mode, zoom, d->canvasController->preferredCenter());
 }
 
 void KarbonZoomController::setZoom(KoZoomMode::Mode mode, qreal zoom, const QPointF &stillPoint)
 {
     if (d->zoomHandler->zoomMode() == mode && d->zoomHandler->zoom() == zoom)
         return; // no change
 
     qreal oldEffectiveZoom = d->action->effectiveZoom();
 
     d->zoomHandler->setZoomMode(mode);
 
     if (mode == KoZoomMode::ZOOM_CONSTANT) {
         if (zoom == 0.0) return;
         d->action->setZoom(zoom);
     } else if (mode == KoZoomMode::ZOOM_WIDTH) {
         zoom = (d->canvasController->viewportSize().width() - 2 * d->fitMargin)
                / (d->zoomHandler->resolutionX() * d->pageSize.width());
         d->action->setSelectedZoomMode(mode);
         d->action->setEffectiveZoom(zoom);
     } else if (mode == KoZoomMode::ZOOM_PAGE) {
         zoom = (d->canvasController->viewportSize().width() - 2 * d->fitMargin)
                / (d->zoomHandler->resolutionX() * d->pageSize.width());
         zoom = qMin(zoom, (d->canvasController->viewportSize().height() - 2 * d->fitMargin)
                     / (d->zoomHandler->resolutionY() * d->pageSize.height()));
 
         d->action->setSelectedZoomMode(mode);
         d->action->setEffectiveZoom(zoom);
     }
 
     d->zoomHandler->setZoom(zoom);
 
     // Tell the canvasController that the zoom has changed
     // Actually canvasController doesn't know about zoom, but the document in pixels
     // has change as a result of the zoom change
     QRectF documentRect = d->canvas->documentViewRect();
     QSizeF viewSize = d->zoomHandler->documentToView(documentRect).size();
     d->canvasController->updateDocumentSize(QSize(qRound(viewSize.width()), qRound(viewSize.height())), true);
 
     d->canvas->adjustOrigin();
 
     // Finally ask the canvasController to recenter
     QPointF documentCenter;
     if (mode == KoZoomMode::ZOOM_CONSTANT) {
         KoSelection * selection = d->canvas->shapeManager()->selection();
         if (selection->count()) {
             QPointF docCenter = selection->boundingRect().center();
             documentCenter = d->canvas->documentOrigin() + d->zoomHandler->documentToView(docCenter);
         } else {
             qreal zoomCoeff = d->action->effectiveZoom() / oldEffectiveZoom;
             QPointF oldCenter = d->canvasController->preferredCenter();
             documentCenter = stillPoint * zoomCoeff - (stillPoint - 1.0 / zoomCoeff * oldCenter);
         }
     } else {
         // center the page rect when change the zoom mode to ZOOM_PAGE or ZOOM_WIDTH
         QRectF pageRect(-documentRect.topLeft(), d->pageSize);
         documentCenter = d->zoomHandler->documentToView(pageRect.center());
     }
     d->canvasController->setPreferredCenter(documentCenter);
     d->canvas->update();
 }
 
 void KarbonZoomController::setAvailableSize()
 {
     if (d->zoomHandler->zoomMode() == KoZoomMode::ZOOM_WIDTH)
         setZoom(KoZoomMode::ZOOM_WIDTH, -1);
     if (d->zoomHandler->zoomMode() == KoZoomMode::ZOOM_PAGE)
         setZoom(KoZoomMode::ZOOM_PAGE, -1);
 }
 
 void KarbonZoomController::requestZoomRelative(const qreal factor, const QPointF &stillPoint)
 {
     qreal zoom = d->zoomHandler->zoom();
     setZoom(KoZoomMode::ZOOM_CONSTANT, factor*zoom, stillPoint);
 }
 
 void KarbonZoomController::requestZoomBy(const qreal factor)
 {
     qreal zoom = d->zoomHandler->zoom();
     setZoom(KoZoomMode::ZOOM_CONSTANT, factor*zoom);
 }
 
 void KarbonZoomController::setPageSize(const QSizeF &pageSize)
 {
     if (d->pageSize == pageSize)
         return;
     d->pageSize = pageSize;
 
     if (d->zoomHandler->zoomMode() == KoZoomMode::ZOOM_WIDTH)
         setZoom(KoZoomMode::ZOOM_WIDTH, -1);
     if (d->zoomHandler->zoomMode() == KoZoomMode::ZOOM_PAGE)
         setZoom(KoZoomMode::ZOOM_PAGE, -1);
 }
 
 void KarbonZoomController::canvasResourceChanged(int key, const QVariant &value)
 {
     if (key == KoCanvasResourceManager::PageSize) {
         setPageSize(value.toSizeF());
 
         // Tell the canvasController that the document in pixels
         // has changed as a result of the page layout change
         QRectF documentRect = d->canvas->documentViewRect();
         QSizeF viewSize = d->zoomHandler->documentToView(documentRect).size();
         d->canvasController->updateDocumentSize(QSize(qRound(viewSize.width()), qRound(viewSize.height())), true);
         d->canvas->adjustOrigin();
         d->canvas->update();
     }
 }
 
 void KarbonZoomController::zoomInRelative()
 {
     requestZoomBy(sqrt(2.0));
 
 }
 
 void KarbonZoomController::zoomOutRelative()
 {
     requestZoomBy(sqrt(0.5));
 }