【QML Demo】图片浏览器V1.0

效果

先看效果图：

代码

下面是一个图片浏览器的简单 Demo：

import QtQuick 2.11
import QtQuick.Window 2.11
import QtQuick.Controls 1.2
import QtQuick.Controls.Styles 1.2
import QtQuick.Dialogs 1.2

Window {
    id: window
    visible: true
     640
    height: 480
    minimumWidth: 480
    minimumHeight: 380
    title: qsTr("ImageViewer")

    BusyIndicator {
        id: busy
        running: false
        anchors.centerIn: parent
        z: 2
    }

    Text {
        id: stateLabel
        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
                stateLabel.visible = false
            }
            else if(imageViewer.status === Image.Ready)
                busy.running = false
            else if(imageViewer.status === Image.Error) {
                busy.running = false
                stateLabel.visible = true
                stateLabel.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;
                border. control.pressed ? 2 : 1;
                border.color: (control.hovered || control.pressed)
                                ? "green" : "#888888";
            }
        }
        //按下按钮，打开文件对话框
        onClicked: fileDialog.open()
        z: 4
    }

    Text {
        id: imageText
        anchors.left: openFile.right
        anchors.leftMargin: 8
        anchors.verticalCenter: openFile.verticalCenter
        font.pixelSize: 20
    }

    FileDialog {
        id: fileDialog
        title: "Please choose a ImageFile"
        nameFilters: ["Image Files (*.jpg *.png *.gif)"]
        onAccepted: {
            imageViewer.source = fileDialog.fileUrl
            var imageFile = new String(fileDialog.fileUrl)
            imageText.text = imageFile.slice(8)
        }
    }
}

在 Open 按钮的 onClicked 信号处理器中，调用 FileDialog 对象的 open() 方法让用户选择文件。当用户选择文件后会触发 FileDialog 的 accepted 信号，我为它创建了 onAccepted 信号处理器，在信号处理器内设置 imageViewer 的 source 属性来显示图片，同时设置 imagePath的text 属性来展示图片文件的路径。