syntharrowbutton.java

java1.6众多例子参考

/*
 * @(#)SynthArrowButton.java	1.20 08/05/22
 *
 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
package javax.swing.plaf.synth;

import java.awt.*;
import javax.swing.*;
import javax.swing.plaf.UIResource;

/**
 * JButton object that draws a scaled Arrow in one of the cardinal directions.
 *
 * @version 1.20, 05/22/08
 * @author Scott Violet
 */
class SynthArrowButton extends JButton implements SwingConstants, UIResource {
    private int direction;

    public SynthArrowButton(int direction) {
        super();
        super.setFocusable(false);
        setDirection(direction);
        setDefaultCapable(false);
    }

    public String getUIClassID() {
        return "ArrowButtonUI";
    }

    public void updateUI() {
        setUI(new SynthArrowButtonUI());
    }

    public void setDirection(int dir) {
        direction = dir;
        putClientProperty("__arrow_direction__", new Integer(dir));
        repaint();
    }

    public int getDirection() {
        return direction;
    }

    public void setFocusable(boolean focusable) {} 
    
    private static class SynthArrowButtonUI extends SynthButtonUI {
        protected void installDefaults(AbstractButton b) {
            super.installDefaults(b);
            updateStyle(b);
        }

        protected void paint(SynthContext context, Graphics g) {
            SynthArrowButton button = (SynthArrowButton)context.
                                      getComponent();
            context.getPainter().paintArrowButtonForeground(
                context, g, 0, 0, button.getWidth(), button.getHeight(),
                button.getDirection());
        }

        void paintBackground(SynthContext context, Graphics g, JComponent c) {
            context.getPainter().paintArrowButtonBackground(context, g, 0, 0,
                                                c.getWidth(), c.getHeight());
        }

        public void paintBorder(SynthContext context, Graphics g, int x,
                                int y, int w, int h) {
            context.getPainter().paintArrowButtonBorder(context, g, x, y, w,h);
        }

        public Dimension getMinimumSize() {
            return new Dimension(5, 5);
        }

        public Dimension getMaximumSize() {
            return new Dimension(Integer.MAX_VALUE, Integer.MAX_VALUE);
        }

        public Dimension getPreferredSize(JComponent c) {
            SynthContext context = getContext(c);
            Dimension dim = null;
            if (context.getComponent().getName() == "ScrollBar.button") {
                // ScrollBar arrow buttons can be non-square when
                // the ScrollBar.squareButtons property is set to FALSE
                // and the ScrollBar.buttonSize property is non-null
                dim = (Dimension)
                    context.getStyle().get(context, "ScrollBar.buttonSize");
            }
            if (dim == null) {
                // For all other cases (including Spinner, ComboBox), we will
                // fall back on the single ArrowButton.size value to create
                // a square return value
                int size =
                    context.getStyle().getInt(context, "ArrowButton.size", 16);
                dim = new Dimension(size, size);
            }

            // handle scaling for sizeVarients for special case components. The
            // key "JComponent.sizeVariant" scales for large/small/mini
            // components are based on Apples LAF
            JComponent parent = (JComponent)context.getComponent().getParent();
            if (parent != null && !(parent instanceof JComboBox)){
                String scaleKey = (String)parent.getClientProperty("JComponent.sizeVariant");
                if (scaleKey != null){
                    if ("large".equals(scaleKey)){
                        dim = new Dimension(
                                (int)(dim.width * 1.15),
                                (int)(dim.height * 1.15));
                    } else if ("small".equals(scaleKey)){
                        dim = new Dimension(
                                (int)(dim.width * 0.857),
                                (int)(dim.height * 0.857));
                    } else if ("mini".equals(scaleKey)){
                        dim = new Dimension(
                                (int)(dim.width * 0.714),
                                (int)(dim.height * 0.714));
                    }
                }
            }

            context.dispose();
            return dim;
        }
    }
}