com.viaoa.jfc.OASplitPane Maven / Gradle / Ivy

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package com.viaoa.jfc;

import java.awt.Component;
import java.awt.Dimension;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;

import javax.swing.JSplitPane;

/**
 * Sets the divider for a splitpane.
 * Corrects some of the JSplitPane issues with setting the divider's location.
 * @author vvia
 */
public class OASplitPane extends JSplitPane {
    
    private ComponentAdapter componentListener;
    
    public OASplitPane(int newOrientation, Component newLeftComponent, Component newRightComponent) {
        super(newOrientation, newLeftComponent, newRightComponent);
        setContinuousLayout(true);
    }
    public OASplitPane(int newOrientation, boolean continousLayout, Component newLeftComponent, Component newRightComponent) {
        super(newOrientation, continousLayout, newLeftComponent, newRightComponent);
        setContinuousLayout(true);
    }
    
    @Override
    public void addNotify() {
        super.addNotify();

        if (componentListener == null) {
            addComponentListener(getMyComponentListener());
        }
    }
 
    
    protected ComponentAdapter getMyComponentListener() {
        if (componentListener != null) return componentListener;

        componentListener = new ComponentAdapter() {
            @Override
            public void componentResized(ComponentEvent e) {
                Dimension d = getSize();
                if (d.width == 0 || d.height == 0) return;                

                int div;
                if (getOrientation() == JSplitPane.VERTICAL_SPLIT) {
                    Dimension dTop = getLeftComponent().getPreferredSize();
                    Dimension dBottom = getRightComponent().getPreferredSize();
                    if (((dTop.height+18) + dBottom.height) < d.height) {
                        div = dTop.height + 18;
                    }
                    else if (dTop.height < d.height/2) {
                        div = dTop.height + 18;
                    }
                    else if (dBottom.height < d.height/2) {
                        div = (d.height - dBottom.height);
                    }
                    else {
                        div = d.height/2;
                    }
                }
                else {
                    Dimension dLeft = getLeftComponent().getPreferredSize();
                    Dimension dRight = getRightComponent().getPreferredSize();
                    if (((dLeft.width+18) + dRight.width) < d.width) {
                        div = dLeft.width + 18;
                    }
                    else if (dLeft.width < d.width/2) {
                        div = dLeft.width + 18;
                    }
                    else if (dRight.width < d.width/2) {
                        div = (d.width - dRight.width);
                    }
                    else {
                        div = d.width/2;
                    }
                }
                setDividerLocation(div);
            }
        };            
        return componentListener;
    }
    
}