Qt quick 图片查看器

//main.qml
import QtQuick 2.2
import QtQuick.Window 2.1
import QtQuick.Controls 1.2
import QtQuick.Controls.Styles 1.2
import QtQuick.Dialogs 1.1
Window {
    visible: true
    width: 600
    height: 480
    minimumWidth: 480
    minimumHeight: 380

    BusyIndicator{
        id:busy
        running:false
        anchors.centerIn: parent
        z:2
    }
    Text{
        id:stateLable
        visible:false
        anchors.centerIn: parent
        z:3
    }
    Image {
        id: imageViewer
        asynchronous: true
        cache:false
        anchors.fill: parent
        fillMode: Image.PreserveAspectFit
        onStatusChanged: {
            if(imageViewer.status===Image.Loading){
                busy.running=true;
                stateLable.visible=false;
            }
            else if(imageViewer.status===Image.Ready){
                busy.running=false;
            }
            else if(imageViewer.status===Image.Error){
                busy.running=false;
                stateLable.visible=true;
                stateLable.text="ERROR";
            }
        }
    }
    Button{
        id:openFile
        text:"Open"
        anchors.left: parent.left
        anchors.leftMargin: 8
        anchors.bottom: parent.bottom
        anchors.bottomMargin: 8
        style: ButtonStyle{
            background: Rectangle{
                implicitWidth: 70
                implicitHeight: 25
                color:control.hovered?"#c0c0c0":"#a0a0a0"
                border.width: control.passed?2:1
                border.color: (control.hovered||control.passed)
                                ?"green":"#888888"
            }
        }
        onClicked: fileDialog.open();
        z:4
    }
    Text{
        id:imagePath
        anchors.left: openFile.right
        anchors.leftMargin: 8
        anchors.verticalCenter: openFile.verticalCenter
        font.pixelSize: 18
    }
    FileDialog{
        id:fileDialog
        title:"please choose"
        nameFilters: ["Image Files(*.jpg *.png *.gif)"]
        onAccepted:{
            imageViewer.source=fileDialog.fileUrl
            var imageFile=String(fileDialog.fileUrl)
            imagePath.text=String(imageFile.substring(8,imageFile.length))
        }
    }
}