Início / coding / Perguntas / 79134252
Accepted
Adalberto José Brasaca
Asked: 2024-10-29 00:14:56 +0800 CST

JavaFX - Comportamento diferente de dois GridPane em hierarquia de componentes iguais

  • 772

Acredito que as propriedades são definidas igualmente em ambos. Na grade "correct.fxml", se eu adicionar 1 linha ou 1 coluna, a barra de rolagem do respectivo ScrollPane aparece. Na grade "wrong.fxml" isso não acontece e não consigo descobrir o porquê. Talvez eu não esteja vendo algo diferente entre eles. Obrigado por qualquer ajuda.

Correto.fxml

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Errado.fxml

insira a descrição da imagem aqui

Correto.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>

Errado.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 respostas

  1. Best Answer

    Na versão "incorreta", você tem fitToWidth="true"e fitToHeight="true"na declaração do seu ScrollPane.

    Isso forçará o conteúdo do painel de rolagem a se ajustar à largura da viewport e à altura da viewport, de modo que ele nunca poderá ser maior que a viewport e, consequentemente, as barras de rolagem nunca poderão aparecer. Veja a documentação para essas propriedades .

    A versão "correta" do seu FXML não tem essas configurações, então o conteúdo (geralmente) será dimensionado para o tamanho preferido, permitindo que as barras de rolagem apareçam quando necessário.

    Há muitas outras anomalias no código. Por exemplo, algumas das suas restrições de coluna têm minWidth="40" maxWidth="40" prefWidth="100", o que obviamente não faz sentido. Normalmente não é uma boa ideia codificar esses tamanhos (ou, de fato, o tamanho do BorderPane, que também é diferente entre suas duas versões) de qualquer maneira: use percentWidthse quiser forçar todas as colunas a terem a mesma largura. (Há outras maneiras de fazer isso também.) Você também tem elementos completamente redundantes no FXML no Panee StackPaneao redor do GridPane.

    • 3

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