- Qt 5.15
- Qt Quick Demo - Photo Viewer
- Qt 5.15.12 Reference Documentation

# Qt Quick Demo - Photo Viewer

     /****************************************************************************
     **
     ** Copyright (C) 2016 The Qt Company Ltd.
     ** Contact: https://www.qt.io/licensing/
     **
     ** This file is part of the examples of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:BSD$
     ** 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 https://www.qt.io/terms-conditions. For further
     ** information use the contact form at https://www.qt.io/contact-us.
     **
     ** BSD License Usage
     ** Alternatively, 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 2.0
     import QtQuick.XmlListModel 2.0
     import QtQml.Models 2.1

     Component {
         id: albumDelegate
         Package {

             Item {
                 Package.name: 'browser'
                 GridView {
                     id: photosGridView; model: visualModel.parts.grid; width: mainWindow.width; height: mainWindow.height - 21
                     x: 0; y: 21; cellWidth: 160; cellHeight: 153; interactive: false
                     onCurrentIndexChanged: photosListView.positionViewAtIndex(currentIndex, ListView.Contain)
                 }
             }

             Item {
                 Package.name: 'fullscreen'
                 ListView {
                     id: photosListView; model: visualModel.parts.list; orientation: Qt.Horizontal
                     width: mainWindow.width; height: mainWindow.height; interactive: false
                     onCurrentIndexChanged: photosGridView.positionViewAtIndex(currentIndex, GridView.Contain)
                     highlightRangeMode: ListView.StrictlyEnforceRange; snapMode: ListView.SnapOneItem
                 }
             }

             Item {
                 Package.name: 'album'
                 id: albumWrapper; width: 210; height: 220

                 DelegateModel {
                     id: visualModel; delegate: PhotoDelegate { }
                     model: RssModel { id: rssModel; tags: tag }
                 }

                 BusyIndicator {
                     id: busyIndicator
                     anchors { centerIn: parent; verticalCenterOffset: -20 }
                     on: rssModel.status != XmlListModel.Ready
                 }

                 PathView {
                     id: photosPathView; model: visualModel.parts.stack; pathItemCount: 5
                     visible: !busyIndicator.visible
                     anchors.centerIn: parent; anchors.verticalCenterOffset: -30
                     path: Path {
                         PathAttribute { name: 'z'; value: 9999.0 }
                         PathLine { x: 1; y: 1 }
                         PathAttribute { name: 'z'; value: 0.0 }
                     }
                 }

                 MouseArea {
                     anchors.fill: parent
                     onClicked: mainWindow.editMode ? photosModel.remove(index) : albumWrapper.state = 'inGrid'
                 }

                 Tag {
                     anchors { horizontalCenter: parent.horizontalCenter; bottom: parent.bottom; bottomMargin: 10 }
                     frontLabel: tag; backLabel: qsTr("Remove"); flipped: mainWindow.editMode
                     onTagChanged: rssModel.tags = tag
                     onBackClicked: if (mainWindow.editMode) photosModel.remove(index);
                 }

                 states: [
                 State {
                     name: 'inGrid'
                     PropertyChanges { target: photosGridView; interactive: true }
                     PropertyChanges { target: albumsShade; opacity: 1 }
                     PropertyChanges { target: backButton; onClicked: albumWrapper.state = ''; y: 6 }
                 },
                 State {
                     name: 'fullscreen'; extend: 'inGrid'
                     PropertyChanges { target: photosGridView; interactive: false }
                     PropertyChanges { target: photosListView; interactive: true }
                     PropertyChanges { target: photosShade; opacity: 1 }
                     PropertyChanges { target: backButton; y: -backButton.height - 8 }
                 }
                 ]

                 GridView.onAdd: NumberAnimation {
                     target: albumWrapper; properties: "scale"; from: 0.0; to: 1.0; easing.type: Easing.OutQuad
                 }
                 GridView.onRemove: SequentialAnimation {
                     PropertyAction { target: albumWrapper; property: "GridView.delayRemove"; value: true }
                     NumberAnimation { target: albumWrapper; property: "scale"; from: 1.0; to: 0.0; easing.type: Easing.OutQuad }
                     PropertyAction { target: albumWrapper; property: "GridView.delayRemove"; value: false }
                 }

                 transitions: [
                 Transition {
                     from: '*'; to: 'inGrid'
                     SequentialAnimation {
                         NumberAnimation { properties: 'opacity'; duration: 250 }
                         PauseAnimation { duration: 350 }
                         NumberAnimation { target: backButton; properties: "y"; duration: 200; easing.type: Easing.OutQuad }
                     }
                 },
                 Transition {
                     from: 'inGrid'; to: '*'
                     NumberAnimation { properties: "y,opacity"; easing.type: Easing.OutQuad; duration: 300 }
                 }
                 ]
             }
         }
     }