Qt Quick小项目

开发环境：

win8 + Qt5.11.2

说明:

用 QML 设计一个应用的登陆界面。

效果图:

新建一个 "Qt Quick Application - empty" 工程，分别添加 “main.qml” 、“LineInput.qml”、“ Button.qml” 这三个 qml 文件。

main.qml

import QtQuick 2.9

Rectangle {
    id: loginWin
     320
    height: 480
    SystemPalette { id: activePalette }

    //背景图片
    Image
    {
        id: background
        anchors { top: parent.top; bottom: parent.bottom }
        anchors.fill: parent
        source: "./background.jpeg"
        fillMode: Image.PreserveAspectCrop
    }

    //顶栏
    Item
    {
        id: topBar
         loginWin.width; height: loginWin.height*0.05
        anchors.top: loginWin.top
        anchors.topMargin: 20

        Text
        {
            id: title
            anchors { top: parent.top; horizontalCenter: parent.horizontalCenter }
            text: "登陆"
            font.bold: true
            font.pointSize: loginWin.height * 0.05 * 0.7
            color: "dark red"
        }
    }

    //空白栏
    Item
    {
        id: space
         loginWin.width; height: loginWin.height * 0.1
        anchors.top: topBar.bottom
    }

    // 登录框
    Rectangle {
        id: loginRect
         loginWin.width * 0.8
        height: loginWin.height * 0.3
        anchors { top: space.bottom; horizontalCenter: parent.horizontalCenter }
        border.color: "#707070"
        color: "transparent"

        LineInput
        {
            id: line
             loginRect.width * 0.8; height: loginRect.height * 0.2
            fontSize:height * 0.7
            anchors { horizontalCenter: loginRect.horizontalCenter; top: loginRect.top; topMargin: 8 }
            hint: "请输入用户号"
        }

        LineInput
        {
             loginRect.width * 0.8; height: loginRect.height * 0.2
            fontSize:height * 0.7
            anchors { horizontalCenter: loginRect.horizontalCenter; bottom: loginButton.top;  bottomMargin: loginRect.height * 0.1 }
            hint: "请输入密码"
        }

        Button
        {
            id: loginButton
             loginRect.width * 0.35; height: loginRect.height * 0.2
            anchors { left: loginRect.left; leftMargin: 28; bottom: loginRect.bottom; bottomMargin: 8 }
            text: "登陆"
            //onClicked: sameGame.startNewGame()
        }

        Button
        {
            id: quitButton
             loginRect.width * 0.35; height: loginRect.height * 0.2
            anchors { right: loginRect.right; rightMargin: 28; bottom: loginRect.bottom; bottomMargin: 8 }
            text: "退出"
            //onClicked: sameGame.startNewGame()
        }
    }
}

LineInput.qml

import QtQuick 2.0

FocusScope {
    id: wrapper

    // 定义可通过元对象系统访问的属性
    property alias text: input.text
    property alias hint: hint.text
    property int fontSize: 18

    // 自定义信号
    signal accepted

    Rectangle {
        anchors.fill: parent
        border.color: "#707070"
        color: "#c1c1c1"
        radius: 4

        // 输入栏隐藏文本
        Text {
            id: hint
            anchors { fill: parent; leftMargin: 14 }
            verticalAlignment: Text.AlignVCenter
            text: "Enter word"
            font.pixelSize: fontSize
            color: "#707070"
            opacity: input.length ? 0 : 1
        }

        TextInput {
            id: input
            focus: true
            anchors { left: parent.left; leftMargin: 14; right: parent.right; top: parent.top; bottom: parent.bottom }
            verticalAlignment: Text.AlignVCenter
            font.pixelSize: fontSize
            color: "black"
            maximumLength: 8

            onAccepted: wrapper.accepted()
        }
    }
}

Button.qml

import QtQuick 2.0

Rectangle {
    id: container

    property string text: "Button"

    signal clicked

     buttonLabel.width + 20; height: buttonLabel.height + 5
    border {  1; color: Qt.darker(activePalette.button) }
    antialiasing: true
    radius: 8

    // color the button with a gradient
    gradient: Gradient {
        GradientStop {
            position: 0.0
            color: {
                if (mouseArea.pressed)
                    return activePalette.dark
                else
                    return activePalette.light
            }
        }
        GradientStop { position: 1.0; color: activePalette.button }
    }

    MouseArea {
        id: mouseArea
        anchors.fill: parent
        onClicked: container.clicked();
    }

    Text {
        id: buttonLabel
        anchors.centerIn: container
        color: activePalette.buttonText
        text: container.text
    }
}