JavaFX如何以编程方式更改GridPane行高

Question

我有一个问题让我疯了几天.

我有一个GridPane,我想在单击按钮时隐藏第一行.
这是FXML文件

<VBox prefHeight="200.0" prefWidth="100.0">
<children>
 <Button fx:id="buttonTest" mnemonicParsing="false" onAction="#handleButtonTestAction" text="Button" />
<GridPane fx:id="gridPaneTest" gridLinesVisible="true" layoutX="0.5" layoutY="0.5" BorderPane.alignment="CENTER">
  <columnConstraints>
    <ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
    <ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
  </columnConstraints>
  <rowConstraints>
    <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
    <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
    <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
  </rowConstraints>
  <children>
   <Label fx:id="labelTopLeft" text="top left">
    <font>
     <Font size="15.0" />
    </font>
   </Label>
   <Label fx:id="labelTopRight" text="top right" GridPane.columnIndex="1">
    <font>
     <Font size="15.0" />
    </font>
   </Label>
   <Label text="center left" GridPane.rowIndex="1">
    <font>
     <Font size="15.0" />
    </font>
   </Label>
   <Label text="center right" GridPane.columnIndex="1" GridPane.rowIndex="1">
    <font>
     <Font size="15.0" />
    </font>
   </Label>
   <Label text="bottom left" GridPane.rowIndex="2">
    <font>
     <Font size="15.0" />
    </font>
   </Label>
   <Label text="bottom right" GridPane.columnIndex="1" GridPane.rowIndex="2">
    <font>
     <Font size="15.0" />
    </font>
   </Label>
  </children>
 </GridPane>
</children>
</VBox>

如果我点击按钮我会这样做

@FXML
public void handleButtonTestAction() {

    labelTopLeft.setVisible(false);
    labelTopRight.setVisible(false);

    gridPaneTest.getRowConstraints().get(0).setMinHeight(0);
    gridPaneTest.getRowConstraints().get(0).setPrefHeight(0);
    gridPaneTest.getRowConstraints().get(0).setMaxHeight(0);
}

单击按钮后,标签将按预期不可见,但第一行的高度根本不会更改.更改行约束后是否必须更新GridPane,还是还有其他事情要做？

谢谢!

Answer 1

Node.setVisible()只是切换a的可见性状态Node.

要从Node父项布局计算中排除a ,您还必须通过调用来设置其托管状态Node.setManaged(false).