Add SwipeDelegate

SwipeDelegate presents a view item that can be swiped left or right to
expose more options or information. It is used as a delegate in views
such as ListView.

Change-Id: I7533a2b223f652993b6cee730930ea6dc125c869
Task-number: QTBUG-51610
Reviewed-by: J-P Nurmi <jpnurmi@theqtcompany.com>

3 files changed, 166 insertions, 0 deletions

diff --git a/examples/controls/gallery/gallery.qml b/examples/controls/gallery/gallery.qml
index fd019c65..90f4b347 100644
--- a/examples/controls/gallery/gallery.qml
+++ b/examples/controls/gallery/gallery.qml
@@ -142,6 +142,7 @@ ApplicationWindow {
                     ListElement { title: "CheckBox"; source: "qrc:/pages/CheckBoxPage.qml" }
                     ListElement { title: "ComboBox"; source: "qrc:/pages/ComboBoxPage.qml" }
                     ListElement { title: "Dial"; source: "qrc:/pages/DialPage.qml" }
+                    ListElement { title: "Delegates"; source: "qrc:/pages/DelegatePage.qml" }
                     ListElement { title: "Drawer"; source: "qrc:/pages/DrawerPage.qml" }
                     ListElement { title: "Frame"; source: "qrc:/pages/FramePage.qml" }
                     ListElement { title: "GroupBox"; source: "qrc:/pages/GroupBoxPage.qml" }
diff --git a/examples/controls/gallery/gallery.qrc b/examples/controls/gallery/gallery.qrc
index 89958333..e29c18ce 100644
--- a/examples/controls/gallery/gallery.qrc
+++ b/examples/controls/gallery/gallery.qrc
@@ -47,5 +47,6 @@
         <file>pages/TextAreaPage.qml</file>
         <file>pages/TextFieldPage.qml</file>
         <file>pages/TumblerPage.qml</file>
+        <file>pages/DelegatePage.qml</file>
     </qresource>
 </RCC>
diff --git a/examples/controls/gallery/pages/DelegatePage.qml b/examples/controls/gallery/pages/DelegatePage.qml
new file mode 100644
index 00000000..049ba00c
--- /dev/null
+++ b/examples/controls/gallery/pages/DelegatePage.qml
@@ -0,0 +1,164 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the examples 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 2.6
+import QtQuick.Layouts 1.1
+import Qt.labs.controls 1.0
+
+Pane {
+    padding: 0
+
+    property var delegateComponentMap: {
+        "ItemDelegate": itemDelegateComponent,
+        "SwipeDelegate": swipeDelegateComponent
+    }
+
+    Component {
+        id: itemDelegateComponent
+
+        ItemDelegate {
+            text: labelText
+            width: parent.width
+        }
+    }
+
+    Component {
+        id: swipeDelegateComponent
+
+        SwipeDelegate {
+            id: swipeDelegate
+            text: labelText
+            width: parent.width
+
+            onClicked: if (exposure.active) view.model.remove(ourIndex)
+
+            Component {
+                id: removeComponent
+
+                Rectangle {
+                    color: swipeDelegate.exposed && swipeDelegate.pressed ? "#333" : "#444"
+                    width: parent.width
+                    height: parent.height
+
+                    Label {
+                        text: "Remove"
+                        color: "white"
+                        anchors.centerIn: parent
+                    }
+                }
+            }
+
+            exposure.left: removeComponent
+            exposure.right: removeComponent
+        }
+    }
+
+    ColumnLayout {
+        id: column
+        spacing: 40
+        anchors.fill: parent
+        anchors.topMargin: 20
+
+        Label {
+            Layout.fillWidth: true
+            wrapMode: Label.Wrap
+            horizontalAlignment: Qt.AlignHCenter
+            text: "Delegate controls are used as delegates in views such as ListView."
+        }
+
+        ListView {
+            id: listView
+            Layout.fillWidth: true
+            Layout.fillHeight: true
+            clip: true
+            model: ListModel {
+                ListElement { type: "ItemDelegate"; text: "ItemDelegate" }
+                ListElement { type: "ItemDelegate"; text: "ItemDelegate" }
+                ListElement { type: "ItemDelegate"; text: "ItemDelegate" }
+                ListElement { type: "SwipeDelegate"; text: "SwipeDelegate" }
+                ListElement { type: "SwipeDelegate"; text: "SwipeDelegate" }
+                ListElement { type: "SwipeDelegate"; text: "SwipeDelegate" }
+            }
+
+            section.property: "type"
+            section.delegate: Pane {
+                width: listView.width
+                height: sectionLabel.implicitHeight + 20
+
+                Label {
+                    id: sectionLabel
+                    text: section
+                    anchors.centerIn: parent
+                }
+            }
+
+            delegate: Loader {
+                id: delegateLoader
+                width: listView.width
+                sourceComponent: delegateComponentMap[text]
+
+                property string labelText: text
+                property ListView view: listView
+                property int ourIndex: index
+
+                // Can't find a way to do this in the SwipeDelegate component itself,
+                // so do it here instead.
+                ListView.onRemove: SequentialAnimation {
+                    PropertyAction {
+                        target: delegateLoader
+                        property: "ListView.delayRemove"
+                        value: true
+                    }
+                    NumberAnimation {
+                        target: item
+                        property: "height"
+                        to: 0
+                        easing.type: Easing.InOutQuad
+                    }
+                    PropertyAction {
+                        target: delegateLoader
+                        property: "ListView.delayRemove"
+                        value: false
+                    }
+                }
+            }
+        }
+    }
+}