Introduce PinchHandler

Similar to PinchArea but with improvements:
- Allows rotating and scaling about an arbitrary point rather than the center
- It's possible to require more than 2 fingers.  E.g. maybe you use
  3 fingers to manage a window, 2 fingers to manipulate content inside.
  This could be achieved with two independent PinchHandlers.

Change-Id: Ifd40cfee115d7bc298378b26a58318bea40a8230
Reviewed-by: Jan Arve Sæther <jan-arve.saether@theqtcompany.com>

3 files changed, 95 insertions, 1 deletions

diff --git a/tests/manual/pointer/main.qml b/tests/manual/pointer/main.qml
index efe603c57f..45a339b302 100644
--- a/tests/manual/pointer/main.qml
+++ b/tests/manual/pointer/main.qml
@@ -52,6 +52,7 @@ Window {
         Component.onCompleted: {
             addExample("joystick", "DragHandler: move one item inside another with any pointing device", Qt.resolvedUrl("joystick.qml"))
             addExample("mixer", "mixing console", Qt.resolvedUrl("mixer.qml"))
+            addExample("pinch", "PinchHandler: scale, rotate and drag", Qt.resolvedUrl("pinchHandler.qml"))
         }
     }
 }
diff --git a/tests/manual/pointer/pinchHandler.qml b/tests/manual/pointer/pinchHandler.qml
new file mode 100644
index 0000000000..e4482a249d
--- /dev/null
+++ b/tests/manual/pointer/pinchHandler.qml
@@ -0,0 +1,93 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the manual tests of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** You may use this file under the terms of the BSD license as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+import QtQuick 2.8
+import Qt.labs.handlers 1.0
+
+Rectangle {
+    id: root
+    width: 1024; height: 600
+    color: "black"
+
+    Rectangle {
+        width: 400
+        height: 300
+        color: "lightsteelblue"
+        antialiasing: true
+
+        Text {
+            anchors.centerIn: parent
+            text: "Pinch with 2 fingers to scale & rotate\nDrag with 1 finger\ncurrent rotation " + pinch2.rotation.toFixed(1)
+        }
+
+        DragHandler { objectName: "DragHandler" }
+
+        PinchHandler {
+            id: pinch2
+            objectName: "2-finger pinch"
+            minimumRotation: -45
+            maximumRotation: 45
+            minimumScale: 0.1
+            maximumScale: 10
+            pointDistanceThreshold: 150
+        }
+    }
+
+    Rectangle {
+        x: 512
+        width: 400
+        height: 300
+        color: "wheat"
+        antialiasing: true
+
+        Text {
+            anchors.centerIn: parent
+            text: "Pinch with 3 fingers to scale & rotate\ncurrent rotation " + pinch3.rotation.toFixed(1)
+        }
+
+        PinchHandler {
+            id: pinch3
+            objectName: "3-finger pinch"
+            requiredPointCount: 3
+            minimumScale: 0.1
+            maximumScale: 10
+        }
+    }
+}
diff --git a/tests/manual/pointer/qml.qrc b/tests/manual/pointer/qml.qrc
index b802a73f08..dac6b08b12 100644
--- a/tests/manual/pointer/qml.qrc
+++ b/tests/manual/pointer/qml.qrc
@@ -2,8 +2,8 @@
     <qresource prefix="/">
         <file>main.qml</file>
         <file>joystick.qml</file>
-        <file>main.qml</file>
         <file>mixer.qml</file>
+        <file>pinchHandler.qml</file>
         <file>content/Slider.qml</file>
         <file>resources/mixer-knob.png</file>
         <file>resources/redball.png</file>