如何在 fxml 中设置边框窗格的边距

Question

我正在尝试在javafx中运行此fxx代码：

<BorderPane fx:controller="com.bryantmorrill.chat.main.Controller"
      xmlns:fx="http://javafx.com/fxml" >
<center>
    <ScrollPane BorderPane.margin="25, 25, 25, 25">
        <content>
            <TextArea fx:id="chatArea" minWidth="200" maxWidth="450"
                      prefWidth="450" minHeight="200" prefHeight="400"
                      maxHeight="400"/>
        </content>
    </ScrollPane>
</center>
<bottom>
    <FlowPane BorderPane.margin="25, 25, 25, 25">
        <TextField fx:id="inputArea" minWidth="200" maxWidth="450" prefWidth="450"/>
        <Button text="Send" onAction="#sendMessage" minWidth="200" maxWidth="450" prefWidth="450"/>
    </FlowPane>
</bottom>

但是，当我尝试以这种方式设置边距时，它会失败：

<ScrollPane BorderPane.margin="25, 25, 25, 25">

我也尝试了这些方法：

<ScrollPane BorderPane.margin="25 25 25 25">
<ScrollPane BorderPane.margin="25">

这是我对所有这些的例外：

java.lang.IllegalArgumentException: Unable to coerce 25, 25, 25, 25 to class javafx.geometry.Insets.

这是我第一次使用 JavaFX，我找不到任何好的例子。感谢您的任何帮助！

Answer 1

您需要

将边距添加为BorderPane子节点的子元素：

<center>
    <ScrollPane>
        <BorderPane.margin>
             <Insets bottom="25.0" left="25.0" right="25.0" top="25.0" />
        </BorderPane.margin>
        <content>
            <TextArea fx:id="chatArea" minWidth="200" maxWidth="450"
                      prefWidth="450" minHeight="200" prefHeight="400"
                      maxHeight="400"/>
        </content>
    </ScrollPane>
</center>
<bottom>
    <FlowPane>
        <BorderPane.margin>
             <Insets bottom="25.0" left="25.0" right="25.0" top="25.0" />
        </BorderPane.margin>
        <TextField fx:id="inputArea" minWidth="200" maxWidth="450" prefWidth="450"/>
        <Button text="Send" onAction="#sendMessage" minWidth="200" maxWidth="450" prefWidth="450"/>
    </FlowPane>
</bottom>