在 Text 元素中使用变量作为文本会立即激活 onTextChanged [英] Using variable as text in Text element immediately activates onTextChanged

问题描述

如果我有以下代码:

import QtQuick 2.10
import QtQuick.Window 2.10

Window {
    id: app
    visible: true
    width: 640
    height: 480
    property bool txt: false

    Text {
        text: app.txt
        onTextChanged: { console.debug("Text changed") }
    }
}

我在应用程序加载后立即在控制台中显示文本已更改"，但是如果我手动将文本设置为类似

I get "Text changed" displayed in my console as soon as the app loads, however if I set the text manually to something like

    Text {
        text: "Some text"
        onTextChanged: { console.debug("Text changed") }
    }

我的控制台中不会显示文本已更改"，除非我确实有一些在应用加载后更改文本的内容.

I don’t get the "Text changed" display in my console unless I actually have something that changes the text after the app loads.

这是正常行为吗?有没有办法将变量用作文本，但不会在应用加载后立即激活 onTextChanged?

Is this normal behaviour? Is there a way to use the variable as the text but not have onTextChanged activate as soon as the app loads?

推荐答案

是的，这是 qml 的正常行为，因为您的第一个 text 属性 是 "" (nothing)，当你给它一个 variety 时，它会从 "" 变成 app.txt.如果你手动设置文本，在这种情况下，没有什么可以改变的.

Yes, it's normal behaviour for qml, becuase your first text property is "" (nothing), and when you give it a variety it changes from "" to app.txt. If you set manually text, in this case, there is nothing to change.

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