Qt+Quick实现图片演示器的开发

Window {
    id: root
    visible: true
    width: 1024; height: 600
    color: "black"
    property int highestZ: 0
    property real defaultSize: 200
    property var currentFrame: undefined

import QtQuick.Window 2.1

        Repeater {
            model: FolderListModel {
                id: folderModel
                objectName: "folderModel"
                showDirs: false
                nameFilters: imageNameFilters
            }

import Qt.labs.folderlistmodel 1.0

    FileDialog {
        id: fileDialog
        title: "Choose a folder with some images"
        selectFolder: true
        folder: picturesLocation
        onAccepted: folderModel.folder = fileUrl + "/"
    }

import QtQuick.Dialogs 1.0

Component.onCompleted: fileDialog.open()

  Image {
        anchors.top: parent.top
        anchors.left: parent.left
        anchors.margins: 10
        source: "resources/folder.png"
        MouseArea {
            anchors.fill: parent
            anchors.margins: -10
            onClicked: fileDialog.open()
            hoverEnabled: true
            onPositionChanged: {
                tooltip.visible = false
                hoverTimer.start()
            }
            onExited: {
                tooltip.visible = false
                hoverTimer.stop()
            }

  Rectangle {
                id: photoFrame
                width: image.width * (1 + 0.10 * image.height / image.width)
                height: image.height * 1.10
                scale: defaultSize / Math.max(image.sourceSize.width, image.sourceSize.height)
                Behavior on scale { NumberAnimation { duration: 200 } }
                Behavior on x { NumberAnimation { duration: 200 } }
                Behavior on y { NumberAnimation { duration: 200 } }
                border.color: "black"
                border.width: 2
                smooth: true
                antialiasing: true
                Component.onCompleted: {
                    x = Math.random() * root.width - width / 2
                    y = Math.random() * root.height - height / 2
                    rotation = Math.random() * 13 - 6
                }

  PinchArea {
                    anchors.fill: parent
                    pinch.target: photoFrame
                    pinch.minimumRotation: -360
                    pinch.maximumRotation: 360
                    pinch.minimumScale: 0.1
                    pinch.maximumScale: 10
                    pinch.dragAxis: Pinch.XAndYAxis
                    onPinchStarted: setFrameColor();

          MouseArea {
                        id: dragArea
                        hoverEnabled: true
                        anchors.fill: parent
                        drag.target: photoFrame
                        scrollGestureEnabled: false  // 2-finger-flick gesture should pass through to the Flickable
                        onPressed: {
                            photoFrame.z = ++root.highestZ;
                            parent.setFrameColor();
                        }
                        onEntered: parent.setFrameColor();

 onWheel: {
                            if (wheel.modifiers & Qt.ControlModifier) {
                                photoFrame.rotation += wheel.angleDelta.y / 120 * 5;
                                if (Math.abs(photoFrame.rotation) < 4)
                                    photoFrame.rotation = 0;
                            } else {
                                photoFrame.rotation += wheel.angleDelta.x / 120;
                                if (Math.abs(photoFrame.rotation) < 0.6)
                                    photoFrame.rotation = 0;
                                var scaleBefore = photoFrame.scale;
                                photoFrame.scale += photoFrame.scale * wheel.angleDelta.y / 120 / 10;
                            }
                        }