Resize a JSplitPane to its maximum or minimum. - Java Swing

Java examples for Swing:JSplitPane

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Description

Resize a JSplitPane to its maximum or minimum.

Demo Code


//package com.java2s;

import java.awt.Insets;
import javax.swing.JSplitPane;

import javax.swing.plaf.basic.BasicSplitPaneDivider;
import javax.swing.plaf.basic.BasicSplitPaneUI;

public class Main {
    /**//from w ww. ja  va  2 s  .com
     * Resize a {@link JSplitPane} to its maximum or minimum. Silently exits
     * without resize if the split pane is not visible. Adapted from
     * {@code OneTouchActionHandler.actionPerformed} in
     * {@link BasicSplitPaneDivider}.
     * 
     * @param toMinimum
     *            {@code true} indicates the resize should go the minimum (top
     *            or left) vs {@code false} which indicates the resize should go
     *            to the maximum.
     * @param splitPane
     *            the split pane to adjust
     */
    public static void resizeSplit(boolean toMinimum, JSplitPane splitPane) {
        BasicSplitPaneUI splitPaneUI = (BasicSplitPaneUI) splitPane.getUI();
        BasicSplitPaneDivider divider = splitPaneUI.getDivider();
        Insets insets = splitPane.getInsets();
        int lastLoc = splitPane.getLastDividerLocation();
        int currentLoc = splitPaneUI.getDividerLocation(splitPane);
        int newLoc;

        if (!splitPane.isVisible()) {
            // if split pane is not visible then
            // splitPane.getHeight() will be -1
            // and we can't get the max/min value to resize to
            // so return
            return;
        }

        // We use the location from the UI directly, as the location the
        // JSplitPane itself maintains is not necessarily correct.
        if (toMinimum) {
            if (splitPane.getOrientation() == JSplitPane.VERTICAL_SPLIT) {
                if (currentLoc >= (splitPane.getHeight() - insets.bottom - divider
                        .getHeight())) {
                    int maxLoc = splitPane.getMaximumDividerLocation();
                    newLoc = Math.min(lastLoc, maxLoc);
                    // splitPaneUI.setKeepHidden(false);
                } else {
                    newLoc = insets.top;
                    // splitPaneUI.setKeepHidden(true);
                }
            } else {
                if (currentLoc >= (splitPane.getWidth() - insets.right - divider
                        .getWidth())) {
                    int maxLoc = splitPane.getMaximumDividerLocation();
                    newLoc = Math.min(lastLoc, maxLoc);
                    // splitPaneUI.setKeepHidden(false);
                } else {
                    newLoc = insets.left;
                    // splitPaneUI.setKeepHidden(true);
                }
            }
        } else {
            if (splitPane.getOrientation() == JSplitPane.VERTICAL_SPLIT) {
                if (currentLoc == insets.top) {
                    int maxLoc = splitPane.getMaximumDividerLocation();
                    newLoc = Math.min(lastLoc, maxLoc);
                    // splitPaneUI.setKeepHidden(false);
                } else {
                    newLoc = splitPane.getHeight() - divider.getHeight()
                            - insets.top;
                    // splitPaneUI.setKeepHidden(true);
                }
            } else {
                if (currentLoc == insets.left) {
                    int maxLoc = splitPane.getMaximumDividerLocation();
                    newLoc = Math.min(lastLoc, maxLoc);
                    // splitPaneUI.setKeepHidden(false);
                } else {
                    newLoc = splitPane.getWidth() - divider.getWidth()
                            - insets.left;
                    // splitPaneUI.setKeepHidden(true);
                }
            }
        }
        if (currentLoc != newLoc) {
            splitPane.setDividerLocation(newLoc);
            // We do this in case the dividers notion of the location
            // differs from the real location.
            splitPane.setLastDividerLocation(currentLoc);
        }
    }
}

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