scrollpanepainter.java

SWING的界面UI包 SWING的界面UI包

/*
 * ScrollPanePainter.java
 *
 * Created on 2007-8-9, 18:39:09
 *
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package dyno.swing.designer.beans.painters;

import dyno.swing.designer.beans.SwingDesigner;

import java.awt.AlphaComposite;
import java.awt.Composite;
import java.awt.Container;
import java.awt.Graphics;
import java.awt.Graphics2D;

import javax.swing.JScrollPane;


public class ScrollPanePainter extends AbstractPainter {
    public ScrollPanePainter(SwingDesigner designer,Container container){
        super(designer, container);
    }
    @Override
    public void paint(Graphics g) {
        boolean accept = isAcceptable() && !isAddingIF();
        Graphics2D g2d = (Graphics2D) g;
        Composite composite = g2d.getComposite();

        g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER,
                HOVER_TRANSLUCENCY));
        g.setColor(accept ? LAYOUT_HOTSPOT_COLOR : LAYOUT_FORBIDDEN_COLOR);
        g.fillRect(hotspot_bounds.x, hotspot_bounds.y, hotspot_bounds.width,
            hotspot_bounds.height);
        g.setColor(SELECTION_COLOR);
        g.drawRect(hotspot_bounds.x, hotspot_bounds.y, hotspot_bounds.width,
            hotspot_bounds.height);

        g2d.setComposite(composite);
    }

    private boolean isAcceptable() {
        JScrollPane scrollPane = (JScrollPane) container;

        return scrollPane.getViewport().getView() == null;
    }
}