Introduce DragHandler

A handler for dragging Items around by touch or mouse.

Change-Id: Id83fea568095eb6374f3f1abc6f550d81f3731df
Reviewed-by: Jan Arve Sæther <jan-arve.saether@theqtcompany.com>

7 files changed, 272 insertions, 1 deletions

diff --git a/tests/manual/pointer/content/Slider.qml b/tests/manual/pointer/content/Slider.qml
new file mode 100644
index 0000000000..363f6911d4
--- /dev/null
+++ b/tests/manual/pointer/content/Slider.qml
@@ -0,0 +1,117 @@
+/****************************************************************************
+**
+** 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
+
+Item {
+    id: root
+    property int value: 50
+    property int maximumValue: 99
+    property alias label: label.text
+
+    Rectangle {
+        id: slot
+        anchors.top: parent.top
+        anchors.bottom: parent.bottom
+        anchors.margins: 10
+        anchors.topMargin: 30
+        anchors.bottomMargin: 30
+        anchors.horizontalCenter: parent.horizontalCenter
+        width: 10
+        color: "black"
+        radius: width / 2
+        smooth: true
+    }
+
+    Rectangle {
+        // RectangularGlow is better, but that's a different module
+        id: glow
+        anchors.fill: knob
+        anchors.margins: -5
+        anchors.leftMargin: -2
+        anchors.horizontalCenterOffset: 1
+        radius: 5
+        color: "#4400FFFF"
+        visible: dragHandler.dragging
+    }
+    Image {
+        id: knob
+        source: "../resources/mixer-knob.png"
+        antialiasing: true
+        x: slot.x - width / 2 + slot.width / 2
+        height: root.width / 2
+        width: implicitWidth / implicitHeight * height
+        property bool programmatic: false
+        property real multiplier: root.maximumValue / (dragHandler.yAxis.maximum - dragHandler.yAxis.minimum)
+        onYChanged: if (!programmatic) root.value = root.maximumValue - (knob.y - dragHandler.yAxis.minimum) * multiplier
+        transformOrigin: Item.Center
+        function setValue(value) { knob.y = dragHandler.yAxis.maximum - value / knob.multiplier }
+        DragHandler {
+            id: dragHandler
+            xAxis.enabled: false
+            yAxis.minimum: slot.y
+            yAxis.maximum: slot.height + slot.y - knob.height
+        }
+    }
+
+    Text {
+        font.pointSize: 16
+        color: "red"
+        anchors.bottom: parent.bottom
+        anchors.horizontalCenter: parent.horizontalCenter
+        text: root.value
+    }
+
+    Text {
+        id: label
+        font.pointSize: 12
+        color: "red"
+        anchors.top: parent.top
+        anchors.topMargin: 5
+        anchors.horizontalCenter: parent.horizontalCenter
+    }
+
+    onHeightChanged: {
+        knob.programmatic = true
+        knob.setValue(root.value)
+        knob.programmatic = false
+    }
+}
diff --git a/tests/manual/pointer/joystick.qml b/tests/manual/pointer/joystick.qml
new file mode 100644
index 0000000000..7959eaea42
--- /dev/null
+++ b/tests/manual/pointer/joystick.qml
@@ -0,0 +1,75 @@
+/****************************************************************************
+**
+** 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 {
+    width: 480
+    height: 480
+    color: "black"
+
+    Image {
+        id: knob
+        source: "resources/redball.png"
+        anchors {
+            horizontalCenter: parent.horizontalCenter
+            verticalCenter: parent.verticalCenter
+        }
+        DragHandler {
+            id: dragHandler
+        }
+        states: [
+            State {
+                when: dragHandler.dragging
+                AnchorChanges {
+                    target: knob
+                    anchors.horizontalCenter: undefined
+                    anchors.verticalCenter: undefined
+                }
+            }
+        ]
+        transitions: [
+            Transition {
+                AnchorAnimation { easing.type: Easing.OutElastic }
+            }
+        ]
+    }
+}
diff --git a/tests/manual/pointer/main.qml b/tests/manual/pointer/main.qml
index aad848c8f0..efe603c57f 100644
--- a/tests/manual/pointer/main.qml
+++ b/tests/manual/pointer/main.qml
@@ -50,7 +50,8 @@ Window {
         id: ll
         anchors.fill: parent
         Component.onCompleted: {
-//            addExample("pointer", "PointerHandler: demonstrate the basics", Qt.resolvedUrl("pointerHandler.qml"))
+            addExample("joystick", "DragHandler: move one item inside another with any pointing device", Qt.resolvedUrl("joystick.qml"))
+            addExample("mixer", "mixing console", Qt.resolvedUrl("mixer.qml"))
         }
     }
 }
diff --git a/tests/manual/pointer/mixer.qml b/tests/manual/pointer/mixer.qml
new file mode 100644
index 0000000000..84ad975340
--- /dev/null
+++ b/tests/manual/pointer/mixer.qml
@@ -0,0 +1,72 @@
+/****************************************************************************
+**
+** 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
+import "content"
+
+Rectangle {
+    id: root
+    width: 1280
+    height: 960
+    objectName: "root"
+    color: "#222222"
+
+    ListView {
+        id: list
+        objectName: "listView"
+        anchors.fill: parent
+        anchors.margins: 10
+        orientation: Qt.Horizontal
+
+        model: 20
+
+        delegate: Item {
+            objectName: "delegateItem" + index
+            width: 154
+            height: list.height
+
+            Slider {
+                anchors.fill: parent
+                label: "Channel " + (index + 1)
+            }
+        }
+    }
+}
diff --git a/tests/manual/pointer/qml.qrc b/tests/manual/pointer/qml.qrc
index 5f6483ac33..b802a73f08 100644
--- a/tests/manual/pointer/qml.qrc
+++ b/tests/manual/pointer/qml.qrc
@@ -1,5 +1,11 @@
 <RCC>
     <qresource prefix="/">
         <file>main.qml</file>
+        <file>joystick.qml</file>
+        <file>main.qml</file>
+        <file>mixer.qml</file>
+        <file>content/Slider.qml</file>
+        <file>resources/mixer-knob.png</file>
+        <file>resources/redball.png</file>
     </qresource>
 </RCC>
diff --git a/tests/manual/pointer/resources/mixer-knob.png b/tests/manual/pointer/resources/mixer-knob.png
new file mode 100644
index 0000000000..02cc9fc72b
--- /dev/null
+++ b/tests/manual/pointer/resources/mixer-knob.png
diff --git a/tests/manual/pointer/resources/redball.png b/tests/manual/pointer/resources/redball.png
new file mode 100644
index 0000000000..68d2e1d638
--- /dev/null
+++ b/tests/manual/pointer/resources/redball.png