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Adalberto José Brasaca
Asked: 2024-10-29 00:14:56 +0800 CST

JavaFX - 相同组件层次结构中两个 GridPane 的不同行为

  • 772

我认为这两个属性的定义是相同的。在“correct.fxml”网格中，如果我添加 1 行或 1 列，则会出现相应的 ScrollPane 滚动条。在“wrong.fxml”网格中不会发生这种情况，我不明白为什么。也许我没有看到它们之间的区别。感谢您的帮助。

正确.fxml

在此处输入图片描述

错误.fxml

在此处输入图片描述

正确.fxml

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.control.ScrollPane?>
<?import javafx.scene.layout.BorderPane?>
<?import javafx.scene.layout.ColumnConstraints?>
<?import javafx.scene.layout.GridPane?>
<?import javafx.scene.layout.Pane?>
<?import javafx.scene.layout.RowConstraints?>
<?import javafx.scene.layout.StackPane?>

<BorderPane maxHeight="-Infinity" maxWidth="-Infinity" prefHeight="429.0" 
prefWidth="761.0" stylesheets="@stylesheet.css" xmlns="http://javafx.com/javafx/22" 
xmlns:fx="http://javafx.com/fxml/1">
   <center>
      <ScrollPane BorderPane.alignment="CENTER">
         <content>
            <StackPane>
               <children>
                  <Pane StackPane.alignment="CENTER">
                     <children>
                        <GridPane alignment="CENTER" hgap="1.0" vgap="1.0">
                          <columnConstraints>
                            <ColumnConstraints halignment="CENTER" hgrow="NEVER" 
maxWidth="40.0" minWidth="40.0" prefWidth="40.0" />
                            <ColumnConstraints halignment="CENTER" hgrow="NEVER" 
maxWidth="40.0" minWidth="40.0" prefWidth="40.0" />
                              <ColumnConstraints halignment="CENTER" hgrow="NEVER" 
maxWidth="40.0" minWidth="40.0" prefWidth="40.0" />
                              <ColumnConstraints halignment="CENTER" hgrow="NEVER" 
maxWidth="40.0" minWidth="40.0" prefWidth="40.0" />
                             <ColumnConstraints halignment="CENTER" hgrow="NEVER" 
maxWidth="40.0" minWidth="40.0" prefWidth="100.0" />
                              <ColumnConstraints halignment="CENTER" hgrow="NEVER" 
maxWidth="40.0" minWidth="40.0" prefWidth="100.0" />
                              <ColumnConstraints halignment="CENTER" hgrow="NEVER" 
maxWidth="40.0" minWidth="40.0" prefWidth="100.0" />
                              <ColumnConstraints halignment="CENTER" hgrow="NEVER" 
maxWidth="40.0" minWidth="40.0" prefWidth="100.0" />
                              <ColumnConstraints halignment="CENTER" hgrow="NEVER" 
maxWidth="40.0" minWidth="40.0" prefWidth="100.0" />
                              <ColumnConstraints halignment="CENTER" hgrow="NEVER" 
maxWidth="40.0" minWidth="40.0" prefWidth="100.0" />
                              <ColumnConstraints halignment="CENTER" hgrow="NEVER" 
maxWidth="40.0" minWidth="40.0" prefWidth="100.0" />
                              <ColumnConstraints halignment="CENTER" hgrow="NEVER" 
maxWidth="40.0" minWidth="40.0" prefWidth="100.0" />
                              <ColumnConstraints halignment="CENTER" hgrow="NEVER" 
maxWidth="40.0" minWidth="40.0" prefWidth="100.0" />
                              <ColumnConstraints halignment="CENTER" hgrow="NEVER" 
maxWidth="40.0" minWidth="40.0" prefWidth="100.0" />
                              <ColumnConstraints halignment="CENTER" hgrow="NEVER" 
maxWidth="40.0" minWidth="40.0" prefWidth="100.0" />
                              <ColumnConstraints halignment="CENTER" hgrow="NEVER" 
maxWidth="40.0" minWidth="40.0" prefWidth="100.0" />
                              <ColumnConstraints halignment="CENTER" hgrow="NEVER" 
maxWidth="40.0" minWidth="40.0" prefWidth="100.0" />
                              <ColumnConstraints halignment="CENTER" hgrow="NEVER" 
maxWidth="40.0" minWidth="40.0" prefWidth="100.0" />
                          </columnConstraints>
                          <rowConstraints>
                            <RowConstraints maxHeight="40.0" minHeight="40.0" 
prefHeight="40.0" valignment="CENTER" vgrow="NEVER" />
                              <RowConstraints maxHeight="40.0" minHeight="40.0" 
prefHeight="40.0" valignment="CENTER" vgrow="NEVER" />
                              <RowConstraints maxHeight="40.0" minHeight="40.0" 
prefHeight="40.0" valignment="CENTER" vgrow="NEVER" />
                              <RowConstraints maxHeight="40.0" minHeight="40.0" 
prefHeight="40.0" valignment="CENTER" vgrow="NEVER" />
                              <RowConstraints maxHeight="40.0" minHeight="40.0" 
prefHeight="40.0" valignment="CENTER" vgrow="NEVER" />
                              <RowConstraints maxHeight="40.0" minHeight="40.0" 
prefHeight="40.0" valignment="CENTER" vgrow="NEVER" />
                              <RowConstraints maxHeight="40.0" minHeight="40.0" 
prefHeight="40.0" valignment="CENTER" vgrow="NEVER" />
                              <RowConstraints maxHeight="40.0" minHeight="40.0" 
prefHeight="40.0" valignment="CENTER" vgrow="NEVER" />
                              <RowConstraints maxHeight="40.0" minHeight="40.0" 
prefHeight="40.0" valignment="CENTER" vgrow="NEVER" />
                              <RowConstraints maxHeight="40.0" minHeight="40.0" 
prefHeight="40.0" valignment="CENTER" vgrow="NEVER" />
                          </rowConstraints>
                        </GridPane>
                     </children>
                  </Pane>
               </children>
            </StackPane>
         </content>
      </ScrollPane>
   </center>
</BorderPane>

错误.fxml

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.control.ScrollPane?>
<?import javafx.scene.layout.BorderPane?>
<?import javafx.scene.layout.ColumnConstraints?>
<?import javafx.scene.layout.GridPane?>
<?import javafx.scene.layout.Pane?>
<?import javafx.scene.layout.RowConstraints?>
<?import javafx.scene.layout.StackPane?>

<BorderPane prefHeight="277.0" prefWidth="495.0" xmlns="http://javafx.com/javafx/22" 
xmlns:fx="http://javafx.com/fxml/1" 
fx:controller="br.com.ablogic.crossword.MainViewController">
   <center>
      <ScrollPane fx:id="scpGrid" fitToHeight="true" fitToWidth="true" 
focusTraversable="false" BorderPane.alignment="CENTER">
         <content>
            <StackPane fx:id="stkPane">
               <children>
                  <Pane fx:id="pane" StackPane.alignment="CENTER">
                     <children>
                        <GridPane alignment="CENTER" hgap="1.0" vgap="1.0">
                          <columnConstraints>
                            <ColumnConstraints halignment="CENTER" hgrow="NEVER" 
maxWidth="40.0" minWidth="40.0" prefWidth="40.0" />
                              <ColumnConstraints halignment="CENTER" hgrow="NEVER" 
maxWidth="40.0" minWidth="40.0" prefWidth="40.0" />
                              <ColumnConstraints halignment="CENTER" hgrow="NEVER" 
maxWidth="40.0" minWidth="40.0" prefWidth="40.0" />
                              <ColumnConstraints halignment="CENTER" hgrow="NEVER" 
maxWidth="40.0" minWidth="40.0" prefWidth="40.0" />
                              <ColumnConstraints halignment="CENTER" hgrow="NEVER" 
maxWidth="40.0" minWidth="40.0" prefWidth="40.0" />
                              <ColumnConstraints halignment="CENTER" hgrow="NEVER" 
maxWidth="40.0" minWidth="40.0" prefWidth="40.0" />
                              <ColumnConstraints halignment="CENTER" hgrow="NEVER" 
maxWidth="40.0" minWidth="40.0" prefWidth="40.0" />
                              <ColumnConstraints halignment="CENTER" hgrow="NEVER" 
maxWidth="40.0" minWidth="40.0" prefWidth="40.0" />
                              <ColumnConstraints halignment="CENTER" hgrow="NEVER" 
maxWidth="40.0" minWidth="40.0" prefWidth="40.0" />
                              <ColumnConstraints halignment="CENTER" hgrow="NEVER" 
maxWidth="40.0" minWidth="40.0" prefWidth="40.0" />
                              <ColumnConstraints halignment="CENTER" hgrow="NEVER" 
maxWidth="40.0" minWidth="40.0" prefWidth="40.0" />
                              <ColumnConstraints halignment="CENTER" hgrow="NEVER" 
maxWidth="40.0" minWidth="40.0" prefWidth="40.0" />
                          </columnConstraints>
                          <rowConstraints>
                            <RowConstraints maxHeight="40.0" minHeight="40.0" 
prefHeight="40.0" valignment="CENTER" vgrow="NEVER" />
                            <RowConstraints maxHeight="40.0" minHeight="40.0" 
prefHeight="40.0" valignment="CENTER" vgrow="NEVER" />
                            <RowConstraints maxHeight="40.0" minHeight="40.0" 
prefHeight="40.0" valignment="CENTER" vgrow="NEVER" />
                              <RowConstraints maxHeight="40.0" minHeight="40.0" 
prefHeight="40.0" valignment="CENTER" vgrow="NEVER" />
                              <RowConstraints maxHeight="40.0" minHeight="40.0" 
prefHeight="40.0" valignment="CENTER" vgrow="NEVER" />
                              <RowConstraints maxHeight="40.0" minHeight="40.0" 
prefHeight="40.0" valignment="CENTER" vgrow="NEVER" />
                          </rowConstraints>
                        </GridPane>
                     </children>
                 </Pane>
              </children>
           </StackPane>
        </content>
     </ScrollPane>
  </center>
</BorderPane>
javafx

1 个回答

  1. Best Answer

    在“不正确”的版本中，您在 的声明中有fitToWidth="true"和。fitToHeight="true"ScrollPane

    这将强制滚动窗格的内容适应视口的宽度和高度，这样它就永远不会大于视口，因此滚动条永远不会出现。请参阅这些属性的文档。

    FXML 的“正确”版本没有这些设置，因此内容（通常）将调整为其首选大小，从而允许滚动条在必要时出现。

    代码中还有许多其他异常。例如，您的某些列约束有minWidth="40" maxWidth="40" prefWidth="100"，这显然没有意义。无论如何，对这些大小（或者，的大小BorderPane，这两个版本之间也不同）进行硬编码通常不是一个好主意：percentWidth如果您想强制所有列具有相同的宽度，请使用。（还有其他方法可以实现这一点。）在 FXML 中的Pane和StackPane周围的元素也完全是多余的GridPane。

    • 3

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