Initial checkin for ZoomTool implementation

Change-Id: I0f2c8906a48b0c1d45fb980a349a8ffb135130b5
Reviewed-by: Kai Koehne <kai.koehne@nokia.com>

8 files changed, 431 insertions, 3 deletions

diff --git a/src/plugins/qmltooling/qmldbg_qtquick2/qmldbg_qtquick2.pro b/src/plugins/qmltooling/qmldbg_qtquick2/qmldbg_qtquick2.pro
index 2d4de57540..33bda11dcc 100644
--- a/src/plugins/qmltooling/qmldbg_qtquick2/qmldbg_qtquick2.pro
+++ b/src/plugins/qmltooling/qmldbg_qtquick2/qmldbg_qtquick2.pro
@@ -15,7 +15,8 @@ SOURCES += \
     selectiontool.cpp \
     qquickviewinspector.cpp \
     ../shared/abstracttool.cpp \
-    ../shared/abstractviewinspector.cpp
+    ../shared/abstractviewinspector.cpp \
+    zoomtool.cpp
 
 HEADERS += \
     qtquick2plugin.h \
@@ -25,7 +26,8 @@ HEADERS += \
     ../shared/abstracttool.h \
     ../shared/abstractviewinspector.h \
     ../shared/qqmlinspectorprotocol.h \
-    ../shared/qmlinspectorconstants.h
+    ../shared/qmlinspectorconstants.h \
+    zoomtool.h
 
 OTHER_FILES += qtquick2plugin.json
 
diff --git a/src/plugins/qmltooling/qmldbg_qtquick2/qquickviewinspector.cpp b/src/plugins/qmltooling/qmldbg_qtquick2/qquickviewinspector.cpp
index 200c66ee35..0a73540b40 100644
--- a/src/plugins/qmltooling/qmldbg_qtquick2/qquickviewinspector.cpp
+++ b/src/plugins/qmltooling/qmldbg_qtquick2/qquickviewinspector.cpp
@@ -44,6 +44,7 @@
 #include "qqmlinspectorprotocol.h"
 #include "highlight.h"
 #include "selectiontool.h"
+#include "zoomtool.h"
 
 #include <QtQuick/private/qquickitem_p.h>
 
@@ -120,6 +121,7 @@ QQuickViewInspector::QQuickViewInspector(QQuickView *view, QObject *parent) :
     m_view(view),
     m_overlay(new QQuickItem),
     m_selectionTool(new SelectionTool(this)),
+    m_zoomTool(0),
     m_designMode(true)
 {
     // Try to make sure the overlay is always on top
@@ -176,7 +178,9 @@ void QQuickViewInspector::changeTool(InspectorProtocol::Tool tool)
         emit selectToolActivated();
         break;
     case InspectorProtocol::ZoomTool:
-        // TODO
+        if (!m_zoomTool)
+            m_zoomTool = new ZoomTool(this, m_view);
+        setCurrentTool(m_zoomTool);
         emit zoomToolActivated();
         break;
     }
diff --git a/src/plugins/qmltooling/qmldbg_qtquick2/qquickviewinspector.h b/src/plugins/qmltooling/qmldbg_qtquick2/qquickviewinspector.h
index fbc3c17b87..e8fdf351de 100644
--- a/src/plugins/qmltooling/qmldbg_qtquick2/qquickviewinspector.h
+++ b/src/plugins/qmltooling/qmldbg_qtquick2/qquickviewinspector.h
@@ -57,6 +57,7 @@ namespace QtQuick2 {
 
 class SelectionTool;
 class SelectionHighlight;
+class ZoomTool;
 
 class QQuickViewInspector : public AbstractViewInspector
 {
@@ -99,6 +100,7 @@ private:
     QQuickItem *m_overlay;
 
     SelectionTool *m_selectionTool;
+    ZoomTool *m_zoomTool;
 
     QList<QWeakPointer<QQuickItem> > m_selectedItems;
     QHash<QQuickItem*, SelectionHighlight*> m_highlightItems;
diff --git a/src/plugins/qmltooling/qmldbg_qtquick2/zoomtool.cpp b/src/plugins/qmltooling/qmldbg_qtquick2/zoomtool.cpp
new file mode 100644
index 0000000000..171f1a52e9
--- /dev/null
+++ b/src/plugins/qmltooling/qmldbg_qtquick2/zoomtool.cpp
@@ -0,0 +1,290 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/
+**
+** This file is part of the QtQml module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** This file may be used under the terms of the GNU Lesser General Public
+** License version 2.1 as published by the Free Software Foundation and
+** appearing in the file LICENSE.LGPL included in the packaging of this
+** file. Please review the following information to ensure the GNU Lesser
+** General Public License version 2.1 requirements will be met:
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "zoomtool.h"
+#include "qquickviewinspector.h"
+
+#include <QtCore/QLineF>
+#include <QtGui/QMouseEvent>
+#include <QtGui/QWheelEvent>
+#include <QtGui/QTouchEvent>
+#include <QtGui/QKeyEvent>
+
+#include <QtQuick/QQuickView>
+#include <QtQuick/QQuickItem>
+
+namespace QmlJSDebugger {
+namespace QtQuick2 {
+
+ZoomTool::ZoomTool(QQuickViewInspector *inspector, QQuickView *view) :
+    AbstractTool(inspector),
+    m_dragStarted(false),
+    m_pinchStarted(false),
+    m_currentScale(1.0f),
+    m_smoothScaleFactor(0.05f),
+    m_minScale(0.125f),
+    m_maxScale(48.0f),
+    m_tapScaleCounter(0)
+{
+    m_rootItem = view->rootItem();
+    m_originalSmooth = m_rootItem->smooth();
+    if (!m_originalSmooth)
+        m_rootItem->setSmooth(true);
+    m_originalPosition = m_rootItem->pos();
+    m_originalScale = m_rootItem->scale();
+}
+
+ZoomTool::~ZoomTool()
+{
+    // restoring the original states.
+    m_rootItem->setScale(m_originalScale);
+    m_rootItem->setPos(m_originalPosition);
+    if (!m_originalSmooth)
+        m_rootItem->setSmooth(m_originalSmooth);
+}
+
+void ZoomTool::mousePressEvent(QMouseEvent *event)
+{
+    m_mousePosition = event->posF();
+    if (event->buttons() & Qt::LeftButton) {
+        m_dragStartPosition = event->posF();
+        m_dragStarted = false;
+    }
+}
+
+void ZoomTool::mouseMoveEvent(QMouseEvent *event)
+{
+    if (m_pinchStarted)
+        return;
+
+    m_mousePosition = event->posF();
+    if (!m_dragStarted
+            && event->buttons() & Qt::LeftButton
+            && ((m_dragStartPosition - event->posF()).manhattanLength()
+                > Constants::DragStartDistance)) {
+        m_dragStarted = true;
+    }
+    if (m_dragStarted) {
+        m_adjustedOrigin += event->posF() - m_dragStartPosition;
+        m_dragStartPosition = event->posF();
+        m_rootItem->setPos(m_adjustedOrigin);
+    }
+}
+
+void ZoomTool::hoverMoveEvent(QMouseEvent *event)
+{
+    m_mousePosition = event->posF();
+}
+
+void ZoomTool::wheelEvent(QWheelEvent *event)
+{
+    if (event->orientation() != Qt::Vertical)
+        return;
+
+    Qt::KeyboardModifier smoothZoomModifier = Qt::ControlModifier;
+    if (event->modifiers() & smoothZoomModifier) {
+        int numDegrees = event->delta() / 8;
+        qreal newScale = m_currentScale + m_smoothScaleFactor * (numDegrees / 15.0f);
+        scaleView(newScale / m_currentScale, m_mousePosition, m_mousePosition);
+    } else if (!event->modifiers()) {
+        if (event->delta() > 0) {
+            zoomIn();
+        } else if (event->delta() < 0) {
+            zoomOut();
+        }
+    }
+}
+
+void ZoomTool::mouseDoubleClickEvent(QMouseEvent *event)
+{
+    m_mousePosition = event->posF();
+    zoomTo100();
+}
+
+void ZoomTool::keyReleaseEvent(QKeyEvent *event)
+{
+    switch (event->key()) {
+    case Qt::Key_Plus:
+        zoomIn();
+        break;
+    case Qt::Key_Minus:
+        zoomOut();
+        break;
+    case Qt::Key_1:
+    case Qt::Key_2:
+    case Qt::Key_3:
+    case Qt::Key_4:
+    case Qt::Key_5:
+    case Qt::Key_6:
+    case Qt::Key_7:
+    case Qt::Key_8:
+    case Qt::Key_9: {
+        qreal newScale = ((event->key() - Qt::Key_0) * 1.0f);
+        scaleView(newScale / m_currentScale, m_mousePosition, m_mousePosition);
+        break;
+    }
+    default:
+        break;
+    }
+}
+
+void ZoomTool::touchEvent(QTouchEvent *event)
+{
+    QList<QTouchEvent::TouchPoint> touchPoints = event->touchPoints();
+
+    switch (event->type()) {
+    case QEvent::TouchBegin:
+        // fall through..
+    case QEvent::TouchUpdate: {
+        if ((touchPoints.count() == 2)
+                && (!(event->touchPointStates() & Qt::TouchPointReleased))) {
+            // determine scale factor
+            const QTouchEvent::TouchPoint &touchPoint0 = touchPoints.first();
+            const QTouchEvent::TouchPoint &touchPoint1 = touchPoints.last();
+
+            qreal touchScaleFactor =
+                    QLineF(touchPoint0.pos(), touchPoint1.pos()).length()
+                    / QLineF(touchPoint0.lastPos(), touchPoint1.lastPos()).length();
+
+            QPointF oldcenter = (touchPoint0.lastPos() + touchPoint1.lastPos()) / 2;
+            QPointF newcenter = (touchPoint0.pos() + touchPoint1.pos()) / 2;
+
+            m_pinchStarted = true;
+            m_tapScaleCounter = 0;
+            scaleView(touchScaleFactor, newcenter, oldcenter);
+        }
+        break;
+    }
+    case QEvent::TouchEnd: {
+        if (m_pinchStarted) {
+            m_pinchStarted = false;
+        } else if ((touchPoints.count() == 1)
+                   &&(!m_dragStarted)) {
+            ++m_tapScaleCounter;
+            qreal factor = 1.0f + (1.0f / (m_tapScaleCounter + 1));
+            scaleView(factor, touchPoints.first().pos(),
+                      touchPoints.first().pos());
+        }
+        break;
+    }
+    default:
+        break;
+    }
+}
+
+void ZoomTool::scaleView(const qreal &factor, const QPointF &newcenter, const QPointF &oldcenter)
+{
+    if (((m_currentScale * factor) > m_maxScale)
+            || ((m_currentScale * factor) < m_minScale)) {
+        return;
+    }
+    //New position = new center + scalefactor * (oldposition - oldcenter)
+    m_adjustedOrigin = newcenter + (factor * (m_adjustedOrigin - oldcenter));
+    m_currentScale *= factor;
+
+    m_rootItem->setScale(m_currentScale);
+    m_rootItem->setPos(m_adjustedOrigin);
+}
+
+void ZoomTool::zoomIn()
+{
+    qreal newScale = nextZoomScale(ZoomIn);
+    scaleView(newScale / m_currentScale, m_mousePosition, m_mousePosition);
+}
+
+void ZoomTool::zoomOut()
+{
+    qreal newScale = nextZoomScale(ZoomOut);
+    scaleView(newScale / m_currentScale, m_mousePosition, m_mousePosition);
+}
+
+void ZoomTool::zoomTo100()
+{
+    m_currentScale = 1.0;
+    m_adjustedOrigin = QPointF(0, 0);
+    m_tapScaleCounter = 0;
+
+    m_rootItem->setPos(m_adjustedOrigin);
+    m_rootItem->setScale(m_currentScale);
+}
+
+qreal ZoomTool::nextZoomScale(ZoomDirection direction)
+{
+    static QList<qreal> zoomScales =
+            QList<qreal>()
+            << 0.125f
+            << 1.0f / 6.0f
+            << 0.25f
+            << 1.0f / 3.0f
+            << 0.5f
+            << 2.0f / 3.0f
+            << 1.0f
+            << 2.0f
+            << 3.0f
+            << 4.0f
+            << 5.0f
+            << 6.0f
+            << 7.0f
+            << 8.0f
+            << 12.0f
+            << 16.0f
+            << 32.0f
+            << 48.0f;
+
+    if (direction == ZoomIn) {
+        for (int i = 0; i < zoomScales.length(); ++i) {
+            if (zoomScales[i] > m_currentScale)
+                return zoomScales[i];
+        }
+        return zoomScales.last();
+    } else {
+        for (int i = zoomScales.length() - 1; i >= 0; --i) {
+            if (zoomScales[i] < m_currentScale)
+                return zoomScales[i];
+        }
+        return zoomScales.first();
+    }
+
+    return 1.0f;
+}
+
+} // namespace QtQuick2
+} // namespace QmlJSDebugger
diff --git a/src/plugins/qmltooling/qmldbg_qtquick2/zoomtool.h b/src/plugins/qmltooling/qmldbg_qtquick2/zoomtool.h
new file mode 100644
index 0000000000..02ed8e09df
--- /dev/null
+++ b/src/plugins/qmltooling/qmldbg_qtquick2/zoomtool.h
@@ -0,0 +1,111 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/
+**
+** This file is part of the QtQml module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** This file may be used under the terms of the GNU Lesser General Public
+** License version 2.1 as published by the Free Software Foundation and
+** appearing in the file LICENSE.LGPL included in the packaging of this
+** file. Please review the following information to ensure the GNU Lesser
+** General Public License version 2.1 requirements will be met:
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef ZOOMTOOL_H
+#define ZOOMTOOL_H
+
+#include "abstracttool.h"
+
+#include <QtCore/QPointF>
+
+QT_FORWARD_DECLARE_CLASS(QQuickView)
+QT_FORWARD_DECLARE_CLASS(QQuickItem)
+
+namespace QmlJSDebugger {
+namespace QtQuick2 {
+
+class QQuickViewInspector;
+
+class ZoomTool : public AbstractTool
+{
+    Q_OBJECT
+
+public:
+    enum ZoomDirection {
+        ZoomIn,
+        ZoomOut
+    };
+
+    explicit ZoomTool(QQuickViewInspector *inspector, QQuickView *view);
+    virtual ~ZoomTool();
+    void leaveEvent(QEvent *) {}
+
+    void mousePressEvent(QMouseEvent *event);
+    void mouseMoveEvent(QMouseEvent *event);
+    void mouseReleaseEvent(QMouseEvent *) {}
+    void mouseDoubleClickEvent(QMouseEvent *event);
+
+    void hoverMoveEvent(QMouseEvent *event);
+    void wheelEvent(QWheelEvent *event);
+
+    void keyPressEvent(QKeyEvent *) {}
+    void keyReleaseEvent(QKeyEvent *event);
+
+    void touchEvent(QTouchEvent *event);
+
+private:
+    qreal nextZoomScale(ZoomDirection direction);
+    void scaleView(const qreal &factor, const QPointF &newcenter, const QPointF &oldcenter);
+    void zoomTo100();
+    void zoomIn();
+    void zoomOut();
+
+private:
+    bool m_originalSmooth;
+    bool m_dragStarted;
+    bool m_pinchStarted;
+    QQuickItem *m_rootItem;
+    QPointF m_adjustedOrigin;
+    QPointF m_dragStartPosition;
+    QPointF m_mousePosition;
+    QPointF m_originalPosition;
+    qreal m_currentScale;
+    qreal m_smoothScaleFactor;
+    qreal m_minScale;
+    qreal m_maxScale;
+    qreal m_tapScaleCounter;
+    qreal m_originalScale;
+};
+
+} // namespace QtQuick2
+} // namespace QmlJSDebugger
+
+#endif // ZOOMTOOL_H
diff --git a/src/plugins/qmltooling/shared/abstracttool.h b/src/plugins/qmltooling/shared/abstracttool.h
index 35817064e2..7e5ba65fd4 100644
--- a/src/plugins/qmltooling/shared/abstracttool.h
+++ b/src/plugins/qmltooling/shared/abstracttool.h
@@ -48,6 +48,7 @@ QT_BEGIN_NAMESPACE
 class QMouseEvent;
 class QKeyEvent;
 class QWheelEvent;
+class QTouchEvent;
 QT_END_NAMESPACE
 
 namespace QmlJSDebugger {
@@ -76,6 +77,8 @@ public:
     virtual void keyPressEvent(QKeyEvent *event) = 0;
     virtual void keyReleaseEvent(QKeyEvent *keyEvent) = 0;
 
+    virtual void touchEvent(QTouchEvent *) {}
+
 private:
     AbstractViewInspector *m_inspector;
 };
diff --git a/src/plugins/qmltooling/shared/abstractviewinspector.cpp b/src/plugins/qmltooling/shared/abstractviewinspector.cpp
index 33e47d270d..135da1b8b7 100644
--- a/src/plugins/qmltooling/shared/abstractviewinspector.cpp
+++ b/src/plugins/qmltooling/shared/abstractviewinspector.cpp
@@ -50,6 +50,7 @@
 #include <QtQml/private/qqmlinspectorservice_p.h>
 
 #include <QtGui/QMouseEvent>
+#include <QtGui/QTouchEvent>
 
 namespace QmlJSDebugger {
 
@@ -220,6 +221,12 @@ bool AbstractViewInspector::eventFilter(QObject *obj, QEvent *event)
         if (wheelEvent(static_cast<QWheelEvent*>(event)))
             return true;
         break;
+    case QEvent::TouchBegin:
+    case QEvent::TouchUpdate:
+    case QEvent::TouchEnd:
+        if (touchEvent(static_cast<QTouchEvent*>(event)))
+            return true;
+        break;
     default:
         break;
     }
@@ -300,6 +307,12 @@ bool AbstractViewInspector::wheelEvent(QWheelEvent *event)
     return true;
 }
 
+bool AbstractViewInspector::touchEvent(QTouchEvent *event)
+{
+    m_currentTool->touchEvent(event);
+    return true;
+}
+
 void AbstractViewInspector::handleMessage(const QByteArray &message)
 {
     QDataStream ds(message);
diff --git a/src/plugins/qmltooling/shared/abstractviewinspector.h b/src/plugins/qmltooling/shared/abstractviewinspector.h
index 0dacc92233..04ca02917e 100644
--- a/src/plugins/qmltooling/shared/abstractviewinspector.h
+++ b/src/plugins/qmltooling/shared/abstractviewinspector.h
@@ -56,6 +56,8 @@ class QQmlInspectorService;
 class QKeyEvent;
 class QMouseEvent;
 class QWheelEvent;
+class QTouchEvent;
+
 QT_END_NAMESPACE
 
 namespace QmlJSDebugger {
@@ -128,6 +130,7 @@ protected:
     virtual bool keyReleaseEvent(QKeyEvent *keyEvent);
     virtual bool mouseDoubleClickEvent(QMouseEvent *event);
     virtual bool wheelEvent(QWheelEvent *event);
+    virtual bool touchEvent(QTouchEvent *event);
 
 private slots:
     void sendColorChanged(const QColor &color);