TextField的prefColumnCount属性是什么? [英] What is the prefColumnCount property for a TextField?

问题描述

我正在阅读

I'm reading the docs for TextField, and I came across a property called prefColumnCount. From what I understand, this property controls the size of the text field, but I can't find a definitive answer, and googling yields nothing. What is a text column? How are they measured? Is there anything that isn't obvious that I should know?

推荐答案

在TextFieldSkin中，您可以使用以下属性找到以下代码段:

In TextFieldSkin you can find this code snippet using the property:

@Override
protected double computePrefWidth(double height, double topInset, double rightInset, double bottomInset, double leftInset) {
    TextField textField = getSkinnable();

    double characterWidth = fontMetrics.get().computeStringWidth("W");

    int columnCount = textField.getPrefColumnCount();

    return columnCount * characterWidth + leftInset + rightInset;
}

即通过将属性的值乘以W的宽度并添加水平插图，可以计算出首选宽度.

I.e. it's used to compute the preferred width by multiplying the value of the property with the width of a W and adding the horizontal insets.

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