Add attached StackView.visible property

[ChangeLog][Controls][StackView] Added attached StackView.visible
property that can be used to control whether items below the top-
most item are kept visible.

Task-number: QTBUG-56801
Change-Id: Ieead0d476f254886cff5f8457bb5c5d23cb7de8a
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>

2 files changed, 76 insertions, 0 deletions

diff --git a/src/imports/controls/doc/images/qtquickcontrols2-stackview-visible.png b/src/imports/controls/doc/images/qtquickcontrols2-stackview-visible.png
new file mode 100644
index 00000000..9d21ce9c
--- /dev/null
+++ b/src/imports/controls/doc/images/qtquickcontrols2-stackview-visible.png
diff --git a/src/imports/controls/doc/snippets/qtquickcontrols2-stackview-visible.qml b/src/imports/controls/doc/snippets/qtquickcontrols2-stackview-visible.qml
new file mode 100644
index 00000000..4689faa3
--- /dev/null
+++ b/src/imports/controls/doc/snippets/qtquickcontrols2-stackview-visible.qml
@@ -0,0 +1,76 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the documentation of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:FDL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Free Documentation License Usage
+** Alternatively, this file may be used under the terms of the GNU Free
+** Documentation License version 1.3 as published by the Free Software
+** Foundation and appearing in the file included in the packaging of
+** this file. Please review the following information to ensure
+** the GNU Free Documentation License version 1.3 requirements
+** will be met: http://www.gnu.org/copyleft/fdl.html.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+import QtQuick 2.9
+import QtQuick.Controls 2.2
+
+//! [1]
+StackView {
+    id: stackView
+    property real offset: 10
+    width: 100; height: 100
+
+    initialItem: Component {
+        id: page
+        Rectangle {
+            property real pos: StackView.index * stackView.offset
+            property real hue: Math.random()
+            color: Qt.hsla(hue, 0.5, 0.8, 0.6)
+            border.color: Qt.hsla(hue, 0.5, 0.5, 0.9)
+            StackView.visible: true
+        }
+    }
+
+    pushEnter: Transition {
+        id: pushEnter
+        ParallelAnimation {
+            PropertyAction { property: "x"; value: pushEnter.ViewTransition.item.pos }
+            NumberAnimation { properties: "y"; from: pushEnter.ViewTransition.item.pos + stackView.offset; to: pushEnter.ViewTransition.item.pos; duration: 400; easing.type: Easing.OutCubic }
+            NumberAnimation { property: "opacity"; from: 0; to: 1; duration: 400; easing.type: Easing.OutCubic }
+        }
+    }
+    popExit: Transition {
+        id: popExit
+        ParallelAnimation {
+            PropertyAction { property: "x"; value: popExit.ViewTransition.item.pos }
+            NumberAnimation { properties: "y"; from: popExit.ViewTransition.item.pos; to: popExit.ViewTransition.item.pos + stackView.offset; duration: 400; easing.type: Easing.OutCubic }
+            NumberAnimation { property: "opacity"; from: 1; to: 0; duration: 400; easing.type: Easing.OutCubic }
+        }
+    }
+
+    pushExit: Transition {
+        id: pushExit
+        PropertyAction { property: "x"; value: pushExit.ViewTransition.item.pos }
+        PropertyAction { property: "y"; value: pushExit.ViewTransition.item.pos }
+    }
+    popEnter: Transition {
+        id: popEnter
+        PropertyAction { property: "x"; value: popEnter.ViewTransition.item.pos }
+        PropertyAction { property: "y"; value: popEnter.ViewTransition.item.pos }
+    }
+}
+//! [1]