CODEWITHSUNDEEP
javafx
NaveenBharadwaj
NaveenBharadwaj

Reputation: 1333

How to lock the divider in SplitPane JavaFX?

I have a SplitPane and I need to divide the layout 25% and 75%. Also, I need to disallow dragging towards right side beyond the 25% split. However I can drag to any extent within the 25% space. Please help.

Upvotes: 8

Views: 15771

Answers (2)

Michael Sims
Michael Sims

Reputation: 2523

This worked for me

private final double dividerMaxWidth = .15;
splitPane.getDividers().get(0).positionProperty().addListener((observable,oldValue,newValue) -> {
    if(splitPane.getDividers().get(0).getPosition() > dividerMaxWidth)
        splitPane.setDividerPosition(0, dividerMaxWidth);
});

And if you want to lock a divider into a hard position that cannot be moved

private final double absolutePosition = .15;
splitPane.getDividers().get(0).positionProperty().addListener((observable,oldValue,newValue) -> {
    splitPane.setDividerPosition(0, absolutePosition);
});

Upvotes: 0

James_D
James_D

Reputation: 209225

SplitPane will respect the min and max dimensions of the components (items) it contains. So to get the behavior you want, bind the maxWidth of the left component to splitPane.maxWidthProperty().multiply(0.25):

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.SplitPane;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class ConstrainedSplitPane extends Application {

    @Override
    public void start(Stage primaryStage) {
        StackPane leftPane = new StackPane(new Label("Left"));
        StackPane rightPane = new StackPane(new Label("Right"));
        SplitPane splitPane = new SplitPane();
        splitPane.getItems().addAll(leftPane, rightPane);
        splitPane.setDividerPositions(0.25);

        //Constrain max size of left component:
        leftPane.maxWidthProperty().bind(splitPane.widthProperty().multiply(0.25));

        primaryStage.setScene(new Scene(new BorderPane(splitPane), 800, 600));
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}

Upvotes: 17

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