最近在学习Qml，但对Qml的各种用法都不太熟悉，总是会搞忘，所以写几篇文章对学习过程中的遇到的东西做一个记录。
学习参考视频：https://www.bilibili.com/video/BV1Ay4y1W7xd?p=1&vd_source=0b527ff208c63f0b1150450fd7023fd8

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1 常用控件

1.1 Text(显示普通文本和富文本)

显示普通文本。

Window {
    visible: true
    width: 320
    height: 240
    title: qsTr("Hello World")
    Text {
          text: "Hello World!"
          font.family: "Helvetica"
          font.pointSize: 24
          color: "red"
    }
}

显示富文本。

Window {
    visible: true
    width: 320
    height: 240
    title: qsTr("Hello World")
    Text {
        text: "<b>Hello</b> <i>World!</i>"
    }
}

1.2 Button(按钮控件)

需要导入QtQuick.Controls 2.xx，如import QtQuick.Controls 2.12。

Window {
    visible: true
    width: 200
    height: 120
    title: qsTr("Hello World")

    Button {
        text: "Ok"
        onPressed: {		//下压
            console.log("pressed " + text)
        }
        onReleased: {		//释放
            console.log("released " + text)
        }
        onClicked: {		//单击，触发一次pressed和一次released
            console.log("click " + text)
        }
        onDoubleClicked: {	//双击
            console.log("doubleClick " + text)
        }
        onPressAndHold: {	//长按，下压后不松手一段时间后触发
            console.log("pressAndHold " + text)
        }
        onCanceled: {		//下压后，在释放之前失去焦点
            console.log("cancel " + text)
        }
    }
}

onCanceled的触发方法：按住按钮不放，然后键盘按Alt+Tab，让它失去焦点。

1.3 RadioButton(单选按钮)

import QtQuick 2.12
import QtQuick.Window 2.12
import QtQuick.Controls 2.12
import QtQuick.Layouts 1.12

Window {
    visible: true; width: 200; height: 200
    ColumnLayout {
        RadioButton {
            checked: true
            text: "r1"
        }
        RadioButton {
            text: "r2"
        }
        RadioButton {
            text: "r3"
        }
    }
}

1.4 CheckBox(多选按钮)

import QtQuick 2.12
import QtQuick.Window 2.12
import QtQuick.Controls 2.12
import QtQuick.Layouts 1.12

Window {
    visible: true; width: 200; height: 200
    ColumnLayout {
        CheckBox {
            id: c1
            checked: true
            text: "c1"
        }
        CheckBox {
            id: c2
            checked: false
            text: "c2"
        }
        CheckBox {
            id: c3
            checked: true
            text: "c3"
        }
    }

    Component.onCompleted: {
        console.log(c1.checked)
        console.log(c2.checked)
        console.log(c3.checked)
    }
}

1.5 Calendar(日历)

import QtQuick 2.12
import QtQuick.Window 2.12
import QtQuick.Controls 1.4

Window {
    visible: true; width: 320; height: 320
    Calendar {
        onSelectedDateChanged: {
            let date = Qt.formatDateTime(selectedDate, "yyyy-MM-dd");
            console.log(date)
        }
    }
}

1.6 ComboBox(下拉选项)

import QtQuick 2.12
import QtQuick.Window 2.12
import QtQuick.Controls 2.12

Window {
    visible: true; width: 200; height: 200
    ComboBox {
        model: ["1111", "2222", "3333"]
        onCurrentIndexChanged: {
            console.log(currentIndex)
        }
    }
}

1.7 Flickable(滑动窗口)

import QtQuick 2.12
import QtQuick.Window 2.12
import QtQuick.Controls 2.12

Window {
    visible: true; width: 400; height: 300

    Flickable {
        anchors.fill: parent
        contentWidth: image.width
        contentHeight: image.height

        Image {
            id: image
            source: './111.jpeg'
        }
    }
}

1.7.1 添加滑动条

import QtQuick 2.12
import QtQuick.Window 2.12
import QtQuick.Controls 2.12

Window {
    visible: true; width: 400; height: 300

    Flickable {
        anchors.fill: parent
        contentWidth: image.width
        contentHeight: image.height

        Image {
            id: image
            source: './111.jpeg'
        }
    }
}

1.8 ListView(列表)

import QtQuick 2.12
import QtQuick.Window 2.12
import QtQuick.Controls 2.12

Window {
    visible: true; width: 400; height: 300

    Column {
        ListView {
            id: list
            width: 100
            height: 200

            model: [
                { name: '宝马', price: '10'},
                { name: '奔驰', price: '50'},
                { name: '大众', price: '100'}
            ]

            delegate: ItemDelegate {
                width: list.width
                text: modelData.name + ": " + modelData.price + (list.currentIndex === index ? ' √' : '')

                background: Rectangle {
                    color: getColor()
                    function getColor() {
                        return Qt.rgba(Math.random(), Math.random(), Math.random())
                    }
                }

                onClicked: {
                    list.currentIndex = index
                    console.log(JSON.stringify(modelData))
                }
            }
            ScrollBar.vertical: ScrollBar {}
        }

        Button {
            onClicked: {
                let model = list.model
                model.push({name: "123", price: "123"})
                list.model = model
            }
        }
    }
}

1.9 Timer(定时器)

import QtQuick 2.12
import QtQuick.Window 2.12
import QtQuick.Controls 2.12

Window {
    visible: true; width: 200; height: 120

    Label {
        Timer {
            interval: 1000
            repeat: true
            running: true
            triggeredOnStart: true
            onTriggered: {
                parent.text = Qt.formatDateTime(new Date(), 'yyyy-MM-dd hh:mm:ss')
            }
        }
    }
}

1.10 SwipeView(滑动窗口)

import QtQuick 2.12
import QtQuick.Window 2.12
import QtQuick.Controls 2.12

Window {
    visible: true; width: 200; height: 120

    SwipeView {
        id: view
        anchors.fill: parent

        Repeater {
            model: 3
            Rectangle {
                color: view.currentIndex == 0 ? 'red' : view.currentIndex == 1 ? 'yellow' : 'white'
                Text {
                    anchors.centerIn: parent
                    text: 'text' + view.currentIndex
                }
            }
        }
    }
    PageIndicator {
        anchors.bottom: view.bottom
        count: view.count
        currentIndex: view.currentIndex
    }
}