Introduce TapHandler

Device-agnostic tap/click detection.  Also detect whether the
taps or clicks occur close enough together in both time and space
to be considered part of a multi-tap gesture.

Change-Id: I41a378feea3340b9f0409118273746a289641d6c
Reviewed-by: Jan Arve Sæther <jan-arve.saether@qt.io>

3 files changed, 138 insertions, 0 deletions

diff --git a/tests/manual/pointer/main.qml b/tests/manual/pointer/main.qml
index 601065081d..b06d3cf155 100644
--- a/tests/manual/pointer/main.qml
+++ b/tests/manual/pointer/main.qml
@@ -59,6 +59,7 @@ Window {
             addExample("fling animation", "DragHandler: after dragging, use an animation to simulate momentum", Qt.resolvedUrl("flingAnimation.qml"))
             addExample("fake Flickable", "implementation of a simplified Flickable using only Items, DragHandler and MomentumAnimation", Qt.resolvedUrl("fakeFlickable.qml"))
             addExample("photo surface", "re-implementation of the existing photo surface demo using Handlers", Qt.resolvedUrl("photosurface.qml"))
+            addExample("tap", "TapHandler: device-agnostic tap/click detection for buttons", Qt.resolvedUrl("tapHandler.qml"))
         }
     }
 }
diff --git a/tests/manual/pointer/qml.qrc b/tests/manual/pointer/qml.qrc
index 87fc021680..4535a26802 100644
--- a/tests/manual/pointer/qml.qrc
+++ b/tests/manual/pointer/qml.qrc
@@ -9,6 +9,7 @@
         <file>photosurface.qml</file>
         <file>pinchHandler.qml</file>
         <file>singlePointHandlerProperties.qml</file>
+        <file>tapHandler.qml</file>
         <file>content/FakeFlickable.qml</file>
         <file>content/MomentumAnimation.qml</file>
         <file>content/Slider.qml</file>
diff --git a/tests/manual/pointer/tapHandler.qml b/tests/manual/pointer/tapHandler.qml
new file mode 100644
index 0000000000..d099fc7faf
--- /dev/null
+++ b/tests/manual/pointer/tapHandler.qml
@@ -0,0 +1,136 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 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 "qrc:/quick/shared/" as Examples
+
+Item {
+    width: 480
+    height: 320
+
+    Rectangle {
+        id: rect
+        anchors.fill: parent; anchors.margins: 40
+        border.width: 3; border.color: "transparent"
+        color: handler.isPressed ? "lightsteelblue" : "darkgrey"
+
+        TapHandler {
+            id: handler
+            acceptedButtons: (leftAllowedCB.checked ? Qt.LeftButton : Qt.NoButton) |
+                             (middleAllowedCB.checked ? Qt.MiddleButton : Qt.NoButton) |
+                             (rightAllowedCB.checked ? Qt.RightButton : Qt.NoButton)
+            onCanceled: {
+                console.log("canceled @ " + pos)
+                borderBlink.blinkColor = "red"
+                borderBlink.start()
+            }
+            onTapped: {
+                console.log("tapped @ " + point.pos + " button(s) " + point.event.button + " tapCount " + tapCount)
+                if (tapCount > 1) {
+                    tapCountLabel.text = tapCount
+                    flashAnimation.start()
+                } else {
+                    switch (point.event.button) {
+                        case Qt.LeftButton: borderBlink.blinkColor = "green"; break;
+                        case Qt.MiddleButton: borderBlink.blinkColor = "orange"; break;
+                        case Qt.RightButton: borderBlink.blinkColor = "magenta"; break;
+                    }
+                    borderBlink.start()
+                }
+            }
+        }
+
+        Text {
+            id: tapCountLabel
+            anchors.centerIn: parent
+            font.pixelSize: 72
+            font.weight: Font.Black
+            SequentialAnimation {
+                id: flashAnimation
+                PropertyAction { target: tapCountLabel; property: "visible"; value: true }
+                PropertyAction { target: tapCountLabel; property: "opacity"; value: 1.0 }
+                PropertyAction { target: tapCountLabel; property: "scale"; value: 1.0 }
+                ParallelAnimation {
+                    NumberAnimation {
+                        target: tapCountLabel
+                        property: "opacity"
+                        to: 0
+                        duration: 500
+                    }
+                    NumberAnimation {
+                        target: tapCountLabel
+                        property: "scale"
+                        to: 1.5
+                        duration: 500
+                    }
+                }
+            }
+        }
+
+        SequentialAnimation {
+            id: borderBlink
+            property color blinkColor: "blue"
+            loops: 3
+            ScriptAction { script: rect.border.color = borderBlink.blinkColor }
+            PauseAnimation { duration: 100 }
+            ScriptAction { script: rect.border.color = "transparent" }
+            PauseAnimation { duration: 100 }
+        }
+    }
+
+    Row {
+        spacing: 6
+        Text { text: "accepted mouse clicks:"; anchors.verticalCenter: leftAllowedCB.verticalCenter }
+        Examples.CheckBox {
+            id: leftAllowedCB
+            checked: true
+            text: "left click"
+        }
+        Examples.CheckBox {
+            id: middleAllowedCB
+            text: "middle click"
+        }
+        Examples.CheckBox {
+            id: rightAllowedCB
+            text: "right click"
+        }
+    }
+}