something

  • 字符串去除前后空格：str.trim();
  • 获取当前时间：Qt.formatFromData(new Date(), "yyyy-MM-dd:ss:mm:zzz");
  • 只读property: readonly property var name: 1;
  • text自动换行参数： wrapMode: Text.Wrap；

ListModel

  1. 申明
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    property ListModel data_model: ListModel{
                                        ListElement {
                                            custom_text: "a"
                                            enable: false
                                        }
                                        ListElement {
                                            custom_text: "b"
                                            enable: false
                                        }
                                    }
  2. 获取长度: data_model.count
  3. 追加: 
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    var data = {"custom_text": "c",
                "enable": true}
    data_model.append(data)
  4. 指定位置插入: data_model.insert(0, data)
  5. 获取索引0指定位置的model： data_model.get(0)
  6. 修改指定位置元素：data_model.setProperty(0, "custom_text", "z")

生成随机字母数字

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function randomRange(min, max) {
    return Math.round(Math.random() * (max - min) + min)
}
function randomStr(len) {
    // 随机字符串
    var rand_str = ""
    for (var i = 0; i < len; ++i) {
        var num = randomRange(0, 9)
        var lower = String.fromCharCode(randomRange(97, 122))
        var upper = String.fromCharCode(randomRange(65, 90))
        rand_str = rand_str + num + lower + upper
    }
    // 随机字符串中随机取字符
    var result = ""
    for (var i = 0; i < len; ++i) {
        result += rand_str[randomRange(0, rand_str.length - 1)];
    }
    return result
}

// example
randomStr(4) // 生成长度为4的数字字母随机字符串

父控件适应子控件大小

使用childrenRect属性childrenRect:

childrenRect.height : real
childrenRect.width : real
childrenRect.x : real
childrenRect.y : real

比如:

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Rectangle {
    width: childrenRect.width
    height: childrenRect.height
    color: "red"

    Label {
        text: "child label"
    }
}