Source Code : Horizontal Split Pane based on JPanel

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Horizontal Split Pane based on JPanel

   
/* Copyright (c) 2006, 2009, Carl Burch. License information is located in the
 * com.cburch.logisim.Main source code and at www.cburch.com/logisim/. */
 

import java.awt.Color;
import java.awt.Component;
import java.awt.Container;
import java.awt.Cursor;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Insets;
import java.awt.LayoutManager;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;

import javax.swing.JComponent;
import javax.swing.JPanel;

public class HorizontalSplitPane extends JPanel {
    static final int DRAG_TOLERANCE = 3;
    private static final Color DRAG_COLOR = new Color(0, 0, 0, 128);

    abstract static class Dragbar extends JComponent
        implements MouseListener, MouseMotionListener {
        private boolean dragging = false;
        private int curValue;
        
        Dragbar() {
            addMouseListener(this);
            addMouseMotionListener(this);
        }
        
        abstract int getDragValue(MouseEvent e);
        abstract void setDragValue(int value);
        
        public void paintComponent(Graphics g) {
            if(dragging) {
                g.setColor(DRAG_COLOR);
                g.fillRect(0, 0, getWidth(), getHeight());
            }
        }
        
        public void mouseClicked(MouseEvent e) { }
        
        public void mousePressed(MouseEvent e) {
            if(!dragging) {
                curValue = getDragValue(e);
                dragging = true;
                repaint();
            }
        }
        
        public void mouseReleased(MouseEvent e) {
            if(dragging) {
                dragging = false;
                int newValue = getDragValue(e);
                if(newValue != curValue) setDragValue(newValue);
                repaint();
            }
        }
        
        public void mouseEntered(MouseEvent e) { }
        
        public void mouseExited(MouseEvent e) { }
        
        public void mouseDragged(MouseEvent e) {
            if(dragging) {
                int newValue = getDragValue(e);
                if(newValue != curValue) setDragValue(newValue);
            }
        }
        
        public void mouseMoved(MouseEvent e) { }
    }

    
    private class MyLayout implements LayoutManager {
        public void addLayoutComponent(String name, Component comp) { }
        public void removeLayoutComponent(Component comp) { }

        public Dimension preferredLayoutSize(Container parent) {
            if(fraction <= 0.0) return comp1.getPreferredSize();
            if(fraction >= 1.0) return comp0.getPreferredSize();
            Insets in = parent.getInsets();
            Dimension d0 = comp0.getPreferredSize();
            Dimension d1 = comp1.getPreferredSize();
            return new Dimension(in.left + Math.max(d0.width, d1.width) + in.right,
                    in.top + d0.height + d1.height + in.bottom);
        }

        public Dimension minimumLayoutSize(Container parent) {
            if(fraction <= 0.0) return comp1.getMinimumSize();
            if(fraction >= 1.0) return comp0.getMinimumSize();
            Insets in = parent.getInsets();
            Dimension d0 = comp0.getMinimumSize();
            Dimension d1 = comp1.getMinimumSize();
            return new Dimension(in.left + Math.max(d0.width, d1.width) + in.right,
                    in.top + d0.height + d1.height + in.bottom);
        }

        public void layoutContainer(Container parent) {
            Insets in = parent.getInsets();
            int maxWidth = parent.getWidth() - (in.left + in.right);
            int maxHeight = parent.getHeight() - (in.top + in.bottom);
            int split;
            if(fraction <= 0.0) {
                split = 0;
            } else if(fraction >= 1.0) {
                split = maxWidth;
            } else {
                split = (int) Math.round(maxHeight * fraction);
                split = Math.min(split, maxHeight - comp1.getMinimumSize().height);
                split = Math.max(split, comp0.getMinimumSize().height);
            }

            comp0.setBounds(in.left, in.top,
                    maxWidth, split);
            comp1.setBounds(in.left, in.top + split,
                    maxWidth, maxHeight - split);
            dragbar.setBounds(in.left, in.top + split - DRAG_TOLERANCE,
                    maxWidth, 2 * DRAG_TOLERANCE);
        }
    }
    
    private class MyDragbar extends Dragbar {
        MyDragbar() {
            setCursor(Cursor.getPredefinedCursor(Cursor.S_RESIZE_CURSOR));
        }
        
        int getDragValue(MouseEvent e) {
            return getY() + e.getY() - HorizontalSplitPane.this.getInsets().top;
        }
    
        void setDragValue(int value) {
            Insets in = HorizontalSplitPane.this.getInsets();
            setFraction((double) value / (HorizontalSplitPane.this.getHeight() - in.bottom - in.top));
            revalidate();
        }
    }

    private JComponent comp0;
    private JComponent comp1;
    private MyDragbar dragbar;
    private double fraction;
    
    public HorizontalSplitPane(JComponent comp0, JComponent comp1) {
        this(comp0, comp1, 0.5);
    }
    
    public HorizontalSplitPane(JComponent comp0, JComponent comp1,
            double fraction) {
        this.comp0 = comp0;
        this.comp1 = comp1;
        this.dragbar = new MyDragbar(); // above the other components
        this.fraction = fraction;

        setLayout(new MyLayout());
        add(dragbar); // above the other components
        add(comp0);
        add(comp1);
    }
    
    public double getFraction() {
        return fraction;
    }
    
    public void setFraction(double value) {
        if(value < 0.0) value = 0.0;
        if(value > 1.0) value = 1.0;
        if(fraction != value) {
            fraction = value;
            revalidate();
        }
    }
}

   
    
    
  

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