src/plugins/qmltooling/qmldbg_inspector/qtquick1/zoomtool.cpp

   1 /****************************************************************************
   2 **
   3 ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
   4 ** All rights reserved.
   5 ** Contact: Nokia Corporation (qt-info@nokia.com)
   6 **
   7 ** This file is part of the QtDeclarative module of the Qt Toolkit.
   8 **
   9 ** $QT_BEGIN_LICENSE:LGPL$
  10 ** GNU Lesser General Public License Usage
  11 ** This file may be used under the terms of the GNU Lesser General Public
  12 ** License version 2.1 as published by the Free Software Foundation and
  13 ** appearing in the file LICENSE.LGPL included in the packaging of this
  14 ** file. Please review the following information to ensure the GNU Lesser
  15 ** General Public License version 2.1 requirements will be met:
  16 ** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
  17 **
  18 ** In addition, as a special exception, Nokia gives you certain additional
  19 ** rights. These rights are described in the Nokia Qt LGPL Exception
  20 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
  21 **
  22 ** GNU General Public License Usage
  23 ** Alternatively, this file may be used under the terms of the GNU General
  24 ** Public License version 3.0 as published by the Free Software Foundation
  25 ** and appearing in the file LICENSE.GPL included in the packaging of this
  26 ** file. Please review the following information to ensure the GNU General
  27 ** Public License version 3.0 requirements will be met:
  28 ** http://www.gnu.org/copyleft/gpl.html.
  29 **
  30 ** Other Usage
  31 ** Alternatively, this file may be used in accordance with the terms and
  32 ** conditions contained in a signed written agreement between you and Nokia.
  33 **
  34 **
  35 **
  36 **
  37 **
  38 ** $QT_END_LICENSE$
  39 **
  40 ****************************************************************************/
  41
  42 #include "zoomtool.h"
  43
  44 #include "qdeclarativeviewinspector_p.h"
  45
  46 #include <QtGui/QMouseEvent>
  47 #include <QtGui/QWheelEvent>
  48 #include <QtGui/QKeyEvent>
  49 #include <QtWidgets/QMenu>
  50 #include <QtWidgets/QAction>
  51
  52 #include <QtCore/QRectF>
  53 #include <QtCore/QDebug>
  54
  55 namespace QmlJSDebugger {
  56
  57 ZoomTool::ZoomTool(QDeclarativeViewInspector *view) :
  58     AbstractLiveEditTool(view),
  59     m_rubberbandManipulator(),
  60     m_smoothZoomMultiplier(0.05f),
  61     m_currentScale(1.0f)
  62 {
  63     m_zoomTo100Action = new QAction(tr("Zoom to &100%"), this);
  64     m_zoomInAction = new QAction(tr("Zoom In"), this);
  65     m_zoomOutAction = new QAction(tr("Zoom Out"), this);
  66     m_zoomInAction->setShortcut(QKeySequence(Qt::Key_Plus));
  67     m_zoomOutAction->setShortcut(QKeySequence(Qt::Key_Minus));
  68
  69
  70     LiveLayerItem *layerItem = QDeclarativeViewInspectorPrivate::get(view)->manipulatorLayer;
  71     QGraphicsObject *layerObject = reinterpret_cast<QGraphicsObject *>(layerItem);
  72     m_rubberbandManipulator = new LiveRubberBandSelectionManipulator(layerObject, view);
  73
  74
  75     connect(m_zoomTo100Action, SIGNAL(triggered()), SLOT(zoomTo100()));
  76     connect(m_zoomInAction, SIGNAL(triggered()), SLOT(zoomIn()));
  77     connect(m_zoomOutAction, SIGNAL(triggered()), SLOT(zoomOut()));
  78 }
  79
  80 ZoomTool::~ZoomTool()
  81 {
  82     delete m_rubberbandManipulator;
  83 }
  84
  85 void ZoomTool::mousePressEvent(QMouseEvent *event)
  86 {
  87     m_mousePos = event->pos();
  88
  89     QPointF scenePos = view()->mapToScene(event->pos());
  90
  91     if (event->buttons() & Qt::RightButton) {
  92         QMenu contextMenu;
  93         contextMenu.addAction(m_zoomTo100Action);
  94         contextMenu.addSeparator();
  95         contextMenu.addAction(m_zoomInAction);
  96         contextMenu.addAction(m_zoomOutAction);
  97         contextMenu.exec(event->globalPos());
  98     } else if (event->buttons() & Qt::LeftButton) {
  99         m_dragBeginPos = scenePos;
 100         m_dragStarted = false;
 101     }
 102 }
 103
 104 void ZoomTool::mouseMoveEvent(QMouseEvent *event)
 105 {
 106     m_mousePos = event->pos();
 107
 108     QPointF scenePos = view()->mapToScene(event->pos());
 109
 110     if (event->buttons() & Qt::LeftButton
 111             && (QPointF(scenePos - m_dragBeginPos).manhattanLength()
 112                 > Constants::DragStartDistance / 3)
 113             && !m_dragStarted)
 114     {
 115         m_dragStarted = true;
 116         m_rubberbandManipulator->begin(m_dragBeginPos);
 117         return;
 118     }
 119
 120     if (m_dragStarted)
 121         m_rubberbandManipulator->update(scenePos);
 122
 123 }
 124
 125 void ZoomTool::mouseReleaseEvent(QMouseEvent *event)
 126 {
 127     m_mousePos = event->pos();
 128     QPointF scenePos = view()->mapToScene(event->pos());
 129
 130     if (m_dragStarted) {
 131         m_rubberbandManipulator->end();
 132
 133         int x1 = qMin(scenePos.x(), m_rubberbandManipulator->beginPoint().x());
 134         int x2 = qMax(scenePos.x(), m_rubberbandManipulator->beginPoint().x());
 135         int y1 = qMin(scenePos.y(), m_rubberbandManipulator->beginPoint().y());
 136         int y2 = qMax(scenePos.y(), m_rubberbandManipulator->beginPoint().y());
 137
 138         QPointF scenePosTopLeft = QPoint(x1, y1);
 139         QPointF scenePosBottomRight = QPoint(x2, y2);
 140
 141         QRectF sceneArea(scenePosTopLeft, scenePosBottomRight);
 142
 143         m_currentScale = qMin(view()->rect().width() / sceneArea.width(),
 144                               view()->rect().height() / sceneArea.height());
 145
 146
 147         QTransform transform;
 148         transform.scale(m_currentScale, m_currentScale);
 149
 150         view()->setTransform(transform);
 151         view()->setSceneRect(sceneArea);
 152     } else {
 153         Qt::KeyboardModifier modifierKey = Qt::ControlModifier;
 154 #ifdef Q_OS_MAC
 155         modifierKey = Qt::AltModifier;
 156 #endif
 157         if (event->modifiers() & modifierKey) {
 158             zoomOut();
 159         } else {
 160             zoomIn();
 161         }
 162     }
 163 }
 164
 165 void ZoomTool::zoomIn()
 166 {
 167     m_currentScale = nextZoomScale(ZoomIn);
 168     scaleView(view()->mapToScene(m_mousePos));
 169 }
 170
 171 void ZoomTool::zoomOut()
 172 {
 173     m_currentScale = nextZoomScale(ZoomOut);
 174     scaleView(view()->mapToScene(m_mousePos));
 175 }
 176
 177 void ZoomTool::mouseDoubleClickEvent(QMouseEvent *event)
 178 {
 179     m_mousePos = event->pos();
 180 }
 181
 182
 183 void ZoomTool::hoverMoveEvent(QMouseEvent *event)
 184 {
 185     m_mousePos = event->pos();
 186 }
 187
 188
 189 void ZoomTool::keyPressEvent(QKeyEvent * /*event*/)
 190 {
 191 }
 192
 193 void ZoomTool::wheelEvent(QWheelEvent *event)
 194 {
 195     if (event->orientation() != Qt::Vertical)
 196         return;
 197
 198     Qt::KeyboardModifier smoothZoomModifier = Qt::ControlModifier;
 199     if (event->modifiers() & smoothZoomModifier) {
 200         int numDegrees = event->delta() / 8;
 201         m_currentScale += m_smoothZoomMultiplier * (numDegrees / 15.0f);
 202
 203         scaleView(view()->mapToScene(m_mousePos));
 204
 205     } else if (!event->modifiers()) {
 206         if (event->delta() > 0) {
 207             m_currentScale = nextZoomScale(ZoomIn);
 208         } else if (event->delta() < 0) {
 209             m_currentScale = nextZoomScale(ZoomOut);
 210         }
 211         scaleView(view()->mapToScene(m_mousePos));
 212     }
 213 }
 214
 215 void ZoomTool::keyReleaseEvent(QKeyEvent *event)
 216 {
 217     switch (event->key()) {
 218     case Qt::Key_Plus:
 219         zoomIn();
 220         break;
 221     case Qt::Key_Minus:
 222         zoomOut();
 223         break;
 224     case Qt::Key_1:
 225     case Qt::Key_2:
 226     case Qt::Key_3:
 227     case Qt::Key_4:
 228     case Qt::Key_5:
 229     case Qt::Key_6:
 230     case Qt::Key_7:
 231     case Qt::Key_8:
 232     case Qt::Key_9:
 233     {
 234         m_currentScale = ((event->key() - Qt::Key_0) * 1.0f);
 235         scaleView(view()->mapToScene(m_mousePos)); // view()->mapToScene(view()->rect().center())
 236         break;
 237     }
 238
 239     default:
 240         break;
 241     }
 242
 243 }
 244
 245 void ZoomTool::clear()
 246 {
 247     view()->setCursor(Qt::ArrowCursor);
 248 }
 249
 250 void ZoomTool::scaleView(const QPointF &centerPos)
 251 {
 252
 253     QTransform transform;
 254     transform.scale(m_currentScale, m_currentScale);
 255     view()->setTransform(transform);
 256
 257     QPointF adjustedCenterPos = centerPos;
 258     QSize rectSize(view()->rect().width() / m_currentScale,
 259                    view()->rect().height() / m_currentScale);
 260
 261     QRectF sceneRect;
 262     if (qAbs(m_currentScale - 1.0f) < Constants::ZoomSnapDelta) {
 263         adjustedCenterPos.rx() = rectSize.width() / 2;
 264         adjustedCenterPos.ry() = rectSize.height() / 2;
 265     }
 266
 267     if (m_currentScale < 1.0f) {
 268         adjustedCenterPos.rx() = rectSize.width() / 2;
 269         adjustedCenterPos.ry() = rectSize.height() / 2;
 270         sceneRect.setRect(view()->rect().width() / 2 -rectSize.width() / 2,
 271                           view()->rect().height() / 2 -rectSize.height() / 2,
 272                           rectSize.width(),
 273                           rectSize.height());
 274     } else {
 275         sceneRect.setRect(adjustedCenterPos.x() - rectSize.width() / 2,
 276                           adjustedCenterPos.y() - rectSize.height() / 2,
 277                           rectSize.width(),
 278                           rectSize.height());
 279     }
 280
 281     view()->setSceneRect(sceneRect);
 282 }
 283
 284 void ZoomTool::zoomTo100()
 285 {
 286     m_currentScale = 1.0f;
 287     scaleView(view()->mapToScene(view()->rect().center()));
 288 }
 289
 290 qreal ZoomTool::nextZoomScale(ZoomDirection direction) const
 291 {
 292     static QList<qreal> zoomScales =
 293             QList<qreal>()
 294             << 0.125f
 295             << 1.0f / 6.0f
 296             << 0.25f
 297             << 1.0f / 3.0f
 298             << 0.5f
 299             << 2.0f / 3.0f
 300             << 1.0f
 301             << 2.0f
 302             << 3.0f
 303             << 4.0f
 304             << 5.0f
 305             << 6.0f
 306             << 7.0f
 307             << 8.0f
 308             << 12.0f
 309             << 16.0f
 310             << 32.0f
 311             << 48.0f;
 312
 313     if (direction == ZoomIn) {
 314         for (int i = 0; i < zoomScales.length(); ++i) {
 315             if (zoomScales[i] > m_currentScale || i == zoomScales.length() - 1)
 316                 return zoomScales[i];
 317         }
 318     } else {
 319         for (int i = zoomScales.length() - 1; i >= 0; --i) {
 320             if (zoomScales[i] < m_currentScale || i == 0)
 321                 return zoomScales[i];
 322         }
 323     }
 324
 325     return 1.0f;
 326 }
 327
 328 } // namespace QmlJSDebugger