- Qt 5.15
- Qt Quick Demo - Photo Viewer
- Qt 5.15.2 Reference Documentation

# Qt Quick Demo - Photo Viewer

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     import QtQuick 2.0
     import "script/script.mjs" as Script

     Package {
         Item { id: stackItem; Package.name: 'stack'; width: 160; height: 153; z: stackItem.PathView.z }
         Item { id: listItem; Package.name: 'list'; width: mainWindow.width + 40; height: 153 }
         Item { id: gridItem; Package.name: 'grid'; width: 160; height: 153 }

         Item {
             width: 160; height: 153

             Item {
                 id: photoWrapper

                 property double randomAngle: Math.random() * (2 * 6 + 1) - 6
                 property double randomAngle2: Math.random() * (2 * 6 + 1) - 6

                 x: 0; y: 0; width: 140; height: 133
                 z: stackItem.PathView.z; rotation: photoWrapper.randomAngle

                 BorderImage {
                     anchors {
                         fill: originalImage.status == Image.Ready ? border : placeHolder
                         leftMargin: -6; topMargin: -6; rightMargin: -8; bottomMargin: -8
                     }
                     source: 'images/box-shadow.png'
                     border.left: 10; border.top: 10; border.right: 10; border.bottom: 10
                 }
                 Rectangle {
                     id: placeHolder

                     property int w: Script.getWidth(content)
                     property int h: Script.getHeight(content)
                     property double s: Script.calculateScale(w, h, photoWrapper.width)

                     color: 'white'; anchors.centerIn: parent; antialiasing: true
                     width:  w * s; height: h * s; visible: originalImage.status != Image.Ready
                     Rectangle {
                         color: "#878787"; antialiasing: true
                         anchors { fill: parent; topMargin: 3; bottomMargin: 3; leftMargin: 3; rightMargin: 3 }
                     }
                 }
                 Rectangle {
                     id: border; color: 'white'; anchors.centerIn: parent; antialiasing: true
                     width: originalImage.paintedWidth + 6; height: originalImage.paintedHeight + 6
                     visible: !placeHolder.visible
                 }
                 BusyIndicator { anchors.centerIn: parent; on: originalImage.status != Image.Ready }
                 Image {
                     id: originalImage; antialiasing: true;
                     source: "http://" + Script.getImagePath(content); cache: false
                     fillMode: Image.PreserveAspectFit; width: photoWrapper.width; height: photoWrapper.height
                 }
                 Image {
                     id: hqImage; antialiasing: true; source: ""; visible: false; cache: false
                     fillMode: Image.PreserveAspectFit; width: photoWrapper.width; height: photoWrapper.height
                 }
                 Binding {
                     target: mainWindow; property: "downloadProgress"; value: hqImage.progress
                     when: listItem.ListView.isCurrentItem
                 }
                 Binding {
                     target: mainWindow; property: "imageLoading"
                     value: (hqImage.status == Image.Loading) ? 1 : 0; when: listItem.ListView.isCurrentItem
                 }
                 MouseArea {
                     width: originalImage.paintedWidth; height: originalImage.paintedHeight; anchors.centerIn: originalImage
                     onClicked: {
                         if (albumWrapper.state == 'inGrid') {
                             gridItem.GridView.view.currentIndex = index;
                             albumWrapper.state = 'fullscreen'
                         } else {
                             gridItem.GridView.view.currentIndex = index;
                             albumWrapper.state = 'inGrid'
                         }
                     }
                 }

                 states: [
                 State {
                     name: 'stacked'; when: albumWrapper.state == ''
                     ParentChange { target: photoWrapper; parent: stackItem; x: 10; y: 10 }
                     PropertyChanges { target: photoWrapper; opacity: stackItem.PathView.onPath ? 1.0 : 0.0 }
                 },
                 State {
                     name: 'inGrid'; when: albumWrapper.state == 'inGrid'
                     ParentChange { target: photoWrapper; parent: gridItem; x: 10; y: 10; rotation: photoWrapper.randomAngle2 }
                 },
                 State {
                     name: 'fullscreen'; when: albumWrapper.state == 'fullscreen'
                     ParentChange {
                         target: photoWrapper; parent: listItem; x: 0; y: 0; rotation: 0
                         width: mainWindow.width; height: mainWindow.height
                     }
                     PropertyChanges { target: border; opacity: 0 }
                     PropertyChanges { target: hqImage; source: listItem.ListView.isCurrentItem ? hq : ""; visible: true }
                 }
                 ]

                 transitions: [
                 Transition {
                     from: 'stacked'; to: 'inGrid'
                     SequentialAnimation {
                         PauseAnimation { duration: 10 * index }
                         ParentAnimation {
                             target: photoWrapper; via: foreground
                             NumberAnimation {
                                 target: photoWrapper; properties: 'x,y,rotation,opacity'; duration: 600; easing.type: 'OutQuart'
                             }
                         }
                     }
                 },
                 Transition {
                     from: 'inGrid'; to: 'stacked'
                     ParentAnimation {
                         target: photoWrapper; via: foreground
                         NumberAnimation { properties: 'x,y,rotation,opacity'; duration: 600; easing.type: 'OutQuart' }
                     }
                 },
                 Transition {
                     from: 'inGrid'; to: 'fullscreen'
                     SequentialAnimation {
                         PauseAnimation { duration: gridItem.GridView.isCurrentItem ? 0 : 600 }
                         ParentAnimation {
                             target: photoWrapper; via: foreground
                             NumberAnimation {
                                 targets: [ photoWrapper, border ]
                                 properties: 'x,y,width,height,opacity,rotation'
                                 duration: gridItem.GridView.isCurrentItem ? 600 : 1; easing.type: 'OutQuart'
                             }
                         }
                     }
                 },
                 Transition {
                     from: 'fullscreen'; to: 'inGrid'
                     ParentAnimation {
                         target: photoWrapper; via: foreground
                         NumberAnimation {
                             targets: [ photoWrapper, border ]
                             properties: 'x,y,width,height,rotation,opacity'
                             duration: gridItem.GridView.isCurrentItem ? 600 : 1; easing.type: 'OutQuart'
                         }
                     }
                 }
                 ]
             }
         }
     }