1 /* This file is part of the KDE project
2  * Copyright (C) 2007 C. Boemann <cbo@boemann.dk>
3  * Copyright (C) 2007 Thomas Zander <zander@kde.org>
4  * Copyright (C) 2007 Jan Hambrecht <jaham@gmx.net>
5  * Copyright (C) 2010 Boudewijn Rempt <boud@kogmbh.com>
6  * Copyright (C) 2011 Arjen Hiemstra <ahiemstra@heimr.nl>
7  *
8  * This library is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Library General Public
10  * License as published by the Free Software Foundation; either
11  * version 2 of the License, or (at your option) any later version.
12  *
13  * This library is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16  * Library General Public License for more details.
17  *
18  * You should have received a copy of the GNU Library General Public License
19  * along with this library; see the file COPYING.LIB.  If not, write to
20  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
21  * Boston, MA 02110-1301, USA.
22  */
23 #include <KoZoomController.h>
24 #include <KoZoomController_p.h>
25 
26 #include <kactioncollection.h>
27 #include <klocalizedstring.h>
28 #include <WidgetsDebug.h>
29 
30 #include <KoZoomHandler.h>
31 #include <KoCanvasBase.h>
32 #include <KoCanvasController.h>
33 
init(KoCanvasController * co,KoZoomHandler * zh,KActionCollection * actionCollection,bool createZoomShortcuts)34 void KoZoomController::Private::init(KoCanvasController *co,
35                                      KoZoomHandler *zh,
36                                      KActionCollection *actionCollection,
37                                      bool createZoomShortcuts)
38 {
39     canvasController = co;
40     fitMargin = co->margin();
41     zoomHandler = zh;
42     connect(action, SIGNAL(zoomChanged(KoZoomMode::Mode,qreal)),
43             parent, SLOT(setZoom(KoZoomMode::Mode,qreal)));
44     connect(action, SIGNAL(aspectModeChanged(bool)),
45             parent, SIGNAL(aspectModeChanged(bool)));
46     connect(action, SIGNAL(zoomedToSelection()),
47             parent, SIGNAL(zoomedToSelection()));
48     connect(action, SIGNAL(zoomedToAll()),
49             parent, SIGNAL(zoomedToAll()));
50 
51     actionCollection->addAction("view_zoom", action);
52 
53     if (createZoomShortcuts) {
54         actionCollection->addAction(KStandardAction::ZoomIn,  "zoom_in", action, SLOT(zoomIn()));
55         actionCollection->addAction(KStandardAction::ZoomOut,  "zoom_out", action, SLOT(zoomOut()));
56     }
57 
58     connect(canvasController->proxyObject, SIGNAL(sizeChanged(QSize)), parent, SLOT(setAvailableSize()) );
59 
60     connect(canvasController->proxyObject, SIGNAL(zoomRelative(qreal,QPointF)), parent, SLOT(requestZoomRelative(qreal,QPointF)) );
61 }
62 
KoZoomController(KoCanvasController * co,KoZoomHandler * zh,KActionCollection * actionCollection,KoZoomAction::SpecialButtons specialButtons,QObject * parent)63 KoZoomController::KoZoomController(KoCanvasController *co, KoZoomHandler *zh, KActionCollection *actionCollection, KoZoomAction::SpecialButtons specialButtons, QObject *parent)
64     : QObject(parent),
65     d(new Private(this, specialButtons))
66 {
67     d->init(co, zh, actionCollection, true);
68 }
69 
70 
KoZoomController(KoCanvasController * co,KoZoomHandler * zh,KActionCollection * actionCollection,bool createZoomShortcuts,KoZoomAction::SpecialButtons specialButtons,QObject * parent)71 KoZoomController::KoZoomController(KoCanvasController *co, KoZoomHandler *zh, KActionCollection *actionCollection, bool createZoomShortcuts, KoZoomAction::SpecialButtons specialButtons, QObject *parent)
72     : QObject(parent),
73     d(new Private(this, specialButtons))
74 {
75     d->init(co, zh, actionCollection, createZoomShortcuts);
76 }
77 
~KoZoomController()78 KoZoomController::~KoZoomController()
79 {
80     delete d;
81 }
82 
zoomAction() const83 KoZoomAction *KoZoomController::zoomAction() const
84 {
85     return d->action;
86 }
87 
setZoomMode(KoZoomMode::Mode mode)88 void KoZoomController::setZoomMode(KoZoomMode::Mode mode)
89 {
90     setZoom(mode, 1.0);
91 }
92 
setPageSize(const QSizeF & pageSize)93 void KoZoomController::setPageSize(const QSizeF &pageSize)
94 {
95     if(d->pageSize == pageSize) return;
96     d->pageSize = pageSize;
97 
98     if(d->zoomHandler->zoomMode() == KoZoomMode::ZOOM_WIDTH)
99         setZoom(KoZoomMode::ZOOM_WIDTH, 0);
100     if(d->zoomHandler->zoomMode() == KoZoomMode::ZOOM_PAGE)
101         setZoom(KoZoomMode::ZOOM_PAGE, 0);
102 }
103 
pageSize() const104 QSizeF KoZoomController::pageSize() const
105 {
106     return d->pageSize;
107 }
108 
setTextMinMax(qreal min,qreal max)109 void KoZoomController::setTextMinMax(qreal min, qreal max)
110 {
111     if(d->textMinX == min && d->textMaxX == max) {
112         return;
113     }
114     d->textMinX = min;
115     d->textMaxX = max;
116 
117     if(d->zoomHandler->zoomMode() == KoZoomMode::ZOOM_TEXT)
118         setZoom(KoZoomMode::ZOOM_TEXT, 0);
119 }
120 
setDocumentSize(const QSizeF & documentSize,bool recalculateCenter)121 void KoZoomController::setDocumentSize(const QSizeF &documentSize, bool recalculateCenter)
122 {
123     d->documentSize = documentSize;
124     d->canvasController->updateDocumentSize(documentToViewport(d->documentSize), recalculateCenter);
125 
126     // Finally ask the canvasController to recenter
127     d->canvasController->recenterPreferred();
128 }
129 
documentSize() const130 QSizeF KoZoomController::documentSize() const
131 {
132     return d->documentSize;
133 }
134 
setZoom(KoZoomMode::Mode mode,qreal zoom)135 void KoZoomController::setZoom(KoZoomMode::Mode mode, qreal zoom)
136 {
137     setZoom(mode, zoom, d->canvasController->preferredCenter());
138 }
139 
setZoom(KoZoomMode::Mode mode,qreal zoom,const QPointF & stillPoint)140 void KoZoomController::setZoom(KoZoomMode::Mode mode, qreal zoom, const QPointF &stillPoint)
141 {
142     setZoom(mode, zoom, d->zoomHandler->resolutionX(), d->zoomHandler->resolutionY(), stillPoint);
143 }
144 
setZoom(KoZoomMode::Mode mode,qreal zoom,qreal resolutionX,qreal resolutionY)145 void KoZoomController::setZoom(KoZoomMode::Mode mode, qreal zoom, qreal resolutionX, qreal resolutionY)
146 {
147     setZoom(mode, zoom, resolutionX, resolutionY, d->canvasController->preferredCenter());
148 }
149 
setZoom(KoZoomMode::Mode mode,qreal zoom,qreal resolutionX,qreal resolutionY,const QPointF & stillPoint)150 void KoZoomController::setZoom(KoZoomMode::Mode mode, qreal zoom, qreal resolutionX, qreal resolutionY, const QPointF &stillPoint)
151 {
152     if (d->zoomHandler->zoomMode() == mode &&
153         qFuzzyCompare(d->zoomHandler->zoom(), zoom) &&
154         qFuzzyCompare(d->zoomHandler->resolutionX(), resolutionX) &&
155         qFuzzyCompare(d->zoomHandler->resolutionY(), resolutionY)) {
156         return; // no change
157     }
158 
159     qreal oldEffectiveZoom = d->action->effectiveZoom();
160     QSize oldPageViewportSize = documentToViewport(d->pageSize);
161     QSize oldTextViewportSize = documentToViewport(QSizeF(d->textMaxX-d->textMinX, 1));
162     qreal yfixAlignTop = d->canvasController->viewportSize().height();
163 
164     if(!qFuzzyCompare(d->zoomHandler->resolutionX(), resolutionX) ||
165        !qFuzzyCompare(d->zoomHandler->resolutionY(), resolutionY)) {
166 
167         d->zoomHandler->setResolution(resolutionX, resolutionY);
168     }
169 
170     if(mode == KoZoomMode::ZOOM_CONSTANT) {
171         if(zoom == 0.0) return;
172         d->action->setZoom(zoom);
173     }
174     else if(mode == KoZoomMode::ZOOM_WIDTH) {
175         zoom = (d->canvasController->viewportSize().width() - 2 * d->fitMargin)
176                     / (oldPageViewportSize.width() / d->zoomHandler->zoom());
177         d->action->setSelectedZoomMode(mode);
178         d->action->setEffectiveZoom(zoom);
179     }
180     else if(mode == KoZoomMode::ZOOM_PAGE) {
181         zoom = (d->canvasController->viewportSize().width() - 2 * d->fitMargin)
182                      / (oldPageViewportSize.width() / d->zoomHandler->zoom());
183         zoom = qMin(zoom, (d->canvasController->viewportSize().height() - 2 * d->fitMargin)
184                      / (oldPageViewportSize.height() / d->zoomHandler->zoom()));
185 
186         d->action->setSelectedZoomMode(mode);
187         d->action->setEffectiveZoom(zoom);
188     }
189     else if (mode == KoZoomMode::ZOOM_TEXT) {
190         zoom = (d->canvasController->viewportSize().width() - 2 * d->fitMargin)
191                     / (oldTextViewportSize.width() / d->zoomHandler->zoom());
192         d->action->setSelectedZoomMode(mode);
193         d->action->setEffectiveZoom(zoom);
194     }
195 
196     d->zoomHandler->setZoomMode(mode);
197     d->zoomHandler->setZoom(d->action->effectiveZoom());
198 
199 #ifdef DEBUG
200     if(! d->documentSize.isValid())
201         warnWidgets << "Setting zoom while there is no document size set, this will fail";
202     else if (d->pageSize.width() > d->documentSize.width() || d->pageSize.height() > d->documentSize.height())
203         warnWidgets << "ZoomController; Your page size is larger than your document size (" <<
204             d->pageSize << " > " << d->documentSize << ")\n";
205 #endif
206 
207     QSize documentViewportSize = documentToViewport(d->documentSize);
208 
209     // Tell the canvasController that the zoom has changed
210     // Actually canvasController doesn't know about zoom, but the document in pixels
211     // has changed as a result of the zoom change
212     // To allow listeners of offset changes to react on the real new offset and not on the
213     // intermediate offsets, we block the signals here, and emit by ourselves later.
214     d->canvasController->proxyObject->blockSignals(true);
215     d->canvasController->updateDocumentSize(documentViewportSize, true);
216     d->canvasController->proxyObject->blockSignals(false);
217 
218     // Finally ask the canvasController to recenter
219     if (d->canvasController->canvasMode() == KoCanvasController::Infinite) {
220         QPointF documentCenter;
221         if (mode == KoZoomMode::ZOOM_WIDTH || mode == KoZoomMode::ZOOM_PAGE) {
222             documentCenter = QRectF(QPointF(), documentViewportSize).center();
223         }
224         else {
225             qreal zoomCoeff = d->action->effectiveZoom() / oldEffectiveZoom;
226             QPointF oldCenter = d->canvasController->preferredCenter();
227             documentCenter = stillPoint * zoomCoeff - (stillPoint - 1.0 / zoomCoeff * oldCenter);
228         }
229         d->canvasController->setPreferredCenter(documentCenter);
230     }
231     else if (mode == KoZoomMode::ZOOM_TEXT) {
232             QPointF documentCenter = d->canvasController->preferredCenter();
233             yfixAlignTop -= d->canvasController->viewportSize().height();
234 
235             documentCenter.setX(d->zoomHandler->documentToViewX(d->textMinX + d->textMaxX) * 0.5);
236             documentCenter.setY(documentCenter.y() - yfixAlignTop);
237             d->canvasController->setPreferredCenter(documentCenter);
238     } else {
239         if (d->canvasController->canvasMode() == KoCanvasController::AlignTop) {
240             QPointF documentCenter = d->canvasController->preferredCenter();
241             documentCenter.setX(0.0);
242             d->canvasController->setPreferredCenter(documentCenter);
243         } else {
244             d->canvasController->recenterPreferred();
245         }
246     }
247 
248     // now that we have the final offset, let's emit some signals
249     //d->canvasController->proxyObject->emitCanvasOffsetXChanged(d->canvasController->canvasOffsetX());
250     //d->canvasController->proxyObject->emitCanvasOffsetYChanged(d->canvasController->canvasOffsetY());
251     emit zoomChanged(mode, d->action->effectiveZoom());
252 }
253 
documentToViewport(const QSizeF & size)254 QSize KoZoomController::documentToViewport(const QSizeF &size)
255 {
256     return d->zoomHandler->documentToView(size).toSize();
257 }
258 
setAspectMode(bool status)259 void KoZoomController::setAspectMode(bool status)
260 {
261     if (d->action) {
262         d->action->setAspectMode(status);
263     }
264 }
265 //have to include this because of Q_PRIVATE_SLOT
266 #include <moc_KoZoomController.cpp>
267