QML隐藏式界面切换

一、例子1：模拟登录界面和主界面

1、登录界面：LoginPage.qml

import QtQuick 2.0
import QtQuick.Controls 2.3

Rectangle {
     400
    height: 300
    color: "#051f58"
    radius: 8

    Button {
        text: "登录页面-登录按钮"
        anchors.centerIn: parent
        onClicked: {
            loginPage.visible = false
            mainPage.visible = true
        }
    }
}

2、主界面：MainPage.qml

import QtQuick 2.0
import QtQuick.Controls 2.3

Rectangle {
    color: "#498ff8"
    radius: 8

    Button {
        text: "主页面-返回按钮"
        anchors.centerIn: parent
        onClicked: {
            loginPage.visible = true
            mainPage.visible = false
        }
    }
}

3、main.qml

import QtQuick 2.9
import QtQuick.Window 2.2

Window {
    visible: true
     640
    height: 480
    title: qsTr("Hello World")

    // 主页面一开始设置"隐藏"，登录成功后才显示
    MainPage {
        id: mainPage
         500
        height: 350
        visible: false // 设置"隐藏"
        anchors.centerIn: parent
    }

    LoginPage {
        id: loginPage
         300
        height: 200
        anchors.centerIn: parent
    }
}

 

 

PS:为啥子QML可以访问父QML定义的id？？

二、例子2：实现界面缩略图

import QtQuick 2.9
import QtQuick.Window 2.2
import QtQuick.Controls 2.3
import Toou2D 1.0

Window {
    id: root
    visible: true
     640
    height: 480
    title: qsTr("Hello World")


    Rectangle {
        id: r1
        property int m_ 200
        property int m_height: 200
        color: "green"
         m_width;
        height: m_height;
        property int m_click_count: 0
        x: 0
        y: 0
        Text {
            id: text
            text: r1.m_click_count
            anchors.horizontalCenter: parent.horizontalCenter
            anchors.top: parent.top
            anchors.topMargin: 10
        }

        states: [
            State {
                name: "mini"
                PropertyChanges {
                    target: r1
                    x: 0
                    y: 0
                     m_width;
                    height: m_height;
                    color: "green"
                }
            },
            State {
                name: "max"
                PropertyChanges {
                    target: r1
                    x: 0
                    y: 0
                     root.width;
                    height: root.height;
                    color: "red"
                }
            }
        ]
        state: "mini"

        //定义过渡
        transitions: [
            Transition {
                //没有设置from/to，过渡关联任何动画
                //比例动画
                NumberAnimation {
                    property: "width"
                    duration: 1000
                    easing.type: Easing.InOutQuad
                }
                NumberAnimation {
                    property: "height"
                    duration: 1000
                    easing.type: Easing.InOutQuad
                }
                //颜色变化
                ColorAnimation {
                    duration: 600
                }
            }
        ]

        TSwitch {
            anchors.centerIn: parent;
            onCheckedChanged: {
                r1.m_click_count++;
                if(checked){
                    r1.visible = true;
                    r2.visible = false;
                    r3.visible = false;
                    r1.state = "max";
                }else{
                    r1.state = "mini";
                    r1.visible = true;
                    r2.visible = true;
                    r3.visible = true;
                }
            }
       }
    }
    Rectangle {
        id: r2
        property int m_ 200
        property int m_height: 200
        color: "gray"
         200;
        height: 200;
        x: 210
        y: 0

        states: [
            State {
                name: "mini"
                PropertyChanges {
                    target: r2
                    x: 210
                    y: 0
                     m_width;
                    height: m_height;
                }
            },
            State {
                name: "max"
                PropertyChanges {
                    target: r2
                    x: 0
                    y: 0
                     root.width;
                    height: root.height;
                }
            }
        ]
        state: "mini"

        //定义过渡
        transitions: [
            Transition {
                //没有设置from/to，过渡关联任何动画
                //比例动画
                NumberAnimation {
                    property: "width"
                    duration: 1000
                    easing.type: Easing.InOutQuad
                }
                NumberAnimation {
                    property: "height"
                    duration: 1000
                    easing.type: Easing.InOutQuad
                }
                NumberAnimation {
                    property: "x"
                    duration: 1000
                    easing.type: Easing.InOutQuad
                }
                NumberAnimation {
                    property: "y"
                    duration: 1000
                    easing.type: Easing.InOutQuad
                }
            }
        ]

        TSwitch {
            anchors.centerIn: parent;
            onCheckedChanged: {
                if(checked){
                    r1.visible = false;
                    r2.visible = true;
                    r3.visible = false;
                    r2.state = "max";
                }else{
                    r2.state = "mini";
                    r1.visible = true;
                    r2.visible = true;
                    r3.visible = true;
                }
            }
       }
    }
    Rectangle {
        id: r3
        property int m_ 200
        property int m_height: 200
        color: "blue"
         200;
        height: 200;
        x: 0
        y: 210
    }
}