Question

我对QML很陌生，并且很适合使用C ++。我一直试图通过一些QML示例来尝试学习它。

我正在玩TumblerColumn控件（来自示例）并且基本上尝试设置模型来设置年份。它类似于：

TumblerColumn {
    id: yearColumn
    width: characterMetrics.width * 4 + tumbler.delegateTextMargins

    model: ListModel {
        Component.onCompleted: {
            for (var i = 2000; i < 2100; ++i) {
                append({value: i.toString()});
            }
        }
    }
    onCurrentIndexChanged: tumblerDayColumn.updateModel()
}

现在，我做了一个改变：

TumblerColumn {
    id: yearColumn
    width: characterMetrics.width * 4 + tumbler.delegateTextMargins

    property int startYear: 2000
    property int endYear: 3000

    model: ListModel {
        Component.onCompleted: {
            for (var i = startYear; i < endYear; ++i) {
                append({value: i.toString()});
            }
        }
    }
    onCurrentIndexChanged: tumblerDayColumn.updateModel()
}

这会返回错误：

ReferenceError：未定义startYear

如何为这样的QML元素定义这些只读常量属性。

Answer 1

java.lang.IllegalArgumentException: Unsupported encoding command ansicpg949 at com.rtfparserkit.parser.standard.StandardRtfParser.processEncoding(StandardRtfParser.java:349) at com.rtfparserkit.parser.standard.StandardRtfParser.processCommand(StandardRtfParser.java:150) at com.rtfparserkit.parser.raw.RawRtfParser.handleCommand(RawRtfParser.java:278) at com.rtfparserkit.parser.raw.RawRtfParser.handleCommand(RawRtfParser.java:241) at com.rtfparserkit.parser.raw.RawRtfParser.parse(RawRtfParser.java:87) at com.rtfparserkit.parser.standard.StandardRtfParser.parse(StandardRtfParser.java:50) at com.rtfparserkit.converter.text.AbstractTextConverter.convert(AbstractTextConverter.java:41) at com.rtfparserkit.converter.text.StringTextConverter.convert(StringTextConverter.java:34) at net.sf.mpxj.common.RtfHelper.strip(RtfHelper.java:61) at net.sf.mpxj.mpp.MPP14Reader.processTaskData(MPP14Reader.java:1513) at net.sf.mpxj.mpp.MPP14Reader.process(MPP14Reader.java:102) at net.sf.mpxj.mpp.MPPReader.read(MPPReader.java:136) at net.sf.mpxj.mpp.MPPReader.read(MPPReader.java:79)和startYear不在此范围内。试试这个

endYear

Answer 2

尝试在result = {'inital_hour': [dict(zip(tuple (query.keys()) ,i)) for i in query.cursor]}中创建新QtObject并添加getter和setter

QML

将自定义属性添加到QML类型

2 个答案: