treenodetogglestrategy.java

利用它可以做出非常漂亮的swt界面,包含的组件有PShelf Plist

package com.swtplus.widgets.toggle;

import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.Widget;

import com.swtplus.internal.PGC;

/**
 * This toggle strategy mimics a Windows tree node.  That is, it shows a plus
 * (surrounded by a box) when collapsed and a minus when expanded.
 *
 * @author chris
 */
public class TreeNodeToggleStrategy implements IToggleStrategy {
	
	private Point location;
	
	/* (non-Javadoc)
	 * @see com.swtplus.widgets.toggle.IToggleStrategy#paint(org.eclipse.swt.events.PaintEvent, boolean, boolean, boolean)
	 */
	public void paint(Widget parent,GC gc, boolean expanded, boolean hasFocus, boolean hovering) {
		PGC gcPlus = new PGC(gc,location.x,location.y);
		
		Color back = gcPlus.getBackground();
		Color fore = gcPlus.getForeground();
		
        gcPlus.setBackground(parent.getDisplay().getSystemColor(SWT.COLOR_LIST_BACKGROUND));
        gcPlus.fillRectangle(0,0,8,8);
        
        gcPlus.setForeground(parent.getDisplay().getSystemColor(SWT.COLOR_WIDGET_FOREGROUND));
        gcPlus.drawLine(2,4,6,4);
        if (!expanded){
            gcPlus.drawLine(4,2,4,6);
        }
        gcPlus.setForeground(parent.getDisplay().getSystemColor(SWT.COLOR_WIDGET_NORMAL_SHADOW));
        gcPlus.drawRectangle(0,0,8,8); 
		
		if (hasFocus){
			gcPlus.setBackground(back);
			gcPlus.setForeground(fore);
			gcPlus.drawFocus(-1,-1,11,11);
		}
	}

	/* 
	 * Returns the toggle's size (9,9).
	 * @see com.swtplus.widgets.toggle.IToggleStrategy#getSize()
	 */
	public Point getSize() {
		return new Point(9,9);
	}

	/* (non-Javadoc)
	 * @see com.swtplus.widgets.toggle.IToggleStrategy#setLocation(org.eclipse.swt.graphics.Point)
	 */
	public void setLocation(Point p) {
		location = p;		
	}

	/**
	 * @return Returns the location.
	 */
	public Point getLocation() {
		return location;
	}
	

}