在QML应用中显示image tag

我们在许多的手机中应用中可以看见在文字中可以插入图片．这对于我们的有些应用添加很多的情趣．在今天的例程中，我们通过一个很小的例程来展示如何实现同样的功能．

   

要实现上面的功能其实并不难．我们首先来看一下QML中的Text的用法．

text : string
The text to display. Text supports both plain and rich text strings.

从上面的描述中，我们可以看出Text是支持plain及rich text的．也就是说，它支持像HTML格式的文本输出．基于这样的特性，我们可以设计我们的程序如下：

TextWithImage.qml

import QtQuick 2.0

Text {
    width: parent.width
    font.pointSize: 30
    wrapMode: Text.WordWrap
    textFormat: Text.StyledText
    horizontalAlignment: main.hAlign
}

Main.qml

import QtQuick 2.0
import Ubuntu.Components 1.1

/*!
    \brief MainView with a Label and Button elements.
*/

MainView {
    // objectName for functional testing purposes (autopilot-qt5)
    objectName: "mainView"

    // Note! applicationName needs to match the "name" field of the click manifest
    applicationName: "imagetag.liu-xiao-guo"

    /*
     This property enables the application to change orientation
     when the device is rotated. The default is false.
    */
    //automaticOrientation: true

    // Removes the old toolbar and enables new features of the new header.
    useDeprecatedToolbar: false

    width: units.gu(60)
    height: units.gu(85)

    Page {
        id: main
        title: i18n.tr("Image Tags")

        property var hAlign: Text.AlignLeft

        Flickable {
            anchors.fill: parent
            anchors.bottomMargin:buttons.height
            contentWidth: parent.width
            contentHeight: col.height + 20

            Column {
                id: col
                x: 10; y: 10
                spacing: 20
                width: parent.width - 20

                TextWithImage {
                    text: "This is a <b>happy</b> face<img src=\"images/face-smile.png\">"
                }
                TextWithImage {
                    text: "This is a <b>very<img src=\"images/face-smile-big.png\" align=\"middle\"/>happy</b> face vertically aligned in the middle."
                }
                TextWithImage {
                    text: "This is a tiny<img src=\"images/face-smile.png\" width=\"15\" height=\"15\">happy face."
                }
                TextWithImage {
                    text: "This is a<img src=\"images/starfish_2.png\" width=\"50\" height=\"50\" align=\"top\">aligned to the top and a<img src=\"images/heart200.png\" width=\"50\" height=\"50\">aligned to the bottom."
                }
                TextWithImage {
                    text: "Qt logos<img src=\"images/qtlogo.png\" width=\"55\" height=\"60\" align=\"middle\"><img src=\"images/qtlogo.png\" width=\"37\" height=\"40\" align=\"middle\"><img src=\"images/qtlogo.png\" width=\"18\" height=\"20\" align=\"middle\">aligned in the middle with different sizes."
                }
                TextWithImage {
                    text: "Some hearts<img src=\"images/heart200.png\" width=\"20\" height=\"20\" align=\"bottom\"><img src=\"images/heart200.png\" width=\"30\" height=\"30\" align=\"bottom\"> <img src=\"images/heart200.png\" width=\"40\" height=\"40\"><img src=\"images/heart200.png\" width=\"50\" height=\"50\" align=\"bottom\">with different sizes."
                }
                TextWithImage {
                    text: "Resized image<img width=\"48\" height=\"48\" align=\"middle\" src=\"http://qt-project.org/images/qt13a/Qt-logo.png\">from the internet."
                }
                TextWithImage {
                    text: "Image<img align=\"middle\" src=\"http://qt-project.org/images/qt13a/Qt-logo.png\">from the internet."
                }
                TextWithImage {
                    height: 120
                    verticalAlignment: Text.AlignVCenter
                    text: "This is a <b>happy</b> face<img src=\"images/face-smile.png\"> with an explicit height."
                }
            }
        }

        Keys.onUpPressed: main.hAlign = Text.AlignHCenter
        Keys.onLeftPressed: main.hAlign = Text.AlignLeft
        Keys.onRightPressed: main.hAlign = Text.AlignRight

        Row {
            id: buttons
            anchors.bottom: parent.bottom
            anchors.horizontalCenter: parent.horizontalCenter
            spacing: units.gu(2)

            Button {
                text: "Align Left"
                onClicked: {
                    main.hAlign = Text.AlignLeft
                }
            }

            Button {
                text: "Align Center"
                onClicked: {
                    main.hAlign = Text.AlignHCenter
                }
            }

            Button {
                text: "Align Right"
                onClicked: {
                    main.hAlign = Text.AlignRight
                }
            }
        }
    }
}

在上面，我们可以看出来，我们在Text中使用了HTML格式的文本输出．这样就可以生成就像我们在文章开始部分显示的应用输出．

应用所有的源码在： https://gitcafe.com/ubuntu/imagetag