imagetogglestrategy.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.graphics.Color;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Widget;

import com.swtplus.internal.PGC;

/**
 * The ImageToggleStrategy shows a toggle using different images you 
 * specify for each of the toggle's states. 
 * 
 * @author Jeremy
 */
public class ImageToggleStrategy implements IToggleStrategy {
	
	private Point location;
	private Image expandedImg;
	private Image collapsedImg;
	private Image expandedHoveringImg;
	private Image collapsedHoveringImg;
	private boolean toggleExpanded = true;
	
	/**
	 * Creates an ImageToggleStrategy with the expanded and collapsed images
	 * specified.
	 * 
	 * @param expanded The image to be displayed when the toggle is expanded
	 * @param collapsed The image to be displayed when the toggle is collapsed
	 */
	public ImageToggleStrategy(Image expanded, Image collapsed){
		this.expandedImg = expanded;
		this.collapsedImg = collapsed;
		this.expandedHoveringImg = expanded;
		this.collapsedHoveringImg = collapsed;
	}
	
	/**
	 * Creates an ImageToggleStrategy with the expanded, expanded and hovering, collapsed
	 * and collapsed and hovering images specified.
	 * 
	 * @param expanded The image when the toggle is expanded
	 * @param collapsed The image when the toggle is collapsed
	 * @param expandedHovering The image when the toggle is expanded and the mouse is hovering over the toggle
	 * @param collapsedHovering The image when the toggle is collapsed and the mouse is hovering over the toggle
	 */
	public ImageToggleStrategy(Image expanded, Image collapsed, Image expandedHovering, Image collapsedHovering){
		this.expandedImg = expanded;
		this.collapsedImg = collapsed;
		this.expandedHoveringImg = expandedHovering;
		this.collapsedHoveringImg = collapsedHovering;
	}
	
	/**
	 * Creates an ImageToggleStrategy with no images specified.
	 * 
	 * Note that the toggle will not paint until all four images are set.
	 * Also see setExpandedImage(), setCollapsedImage(),setExpandedHovering(),setCollapsedHovering();
	 */
	
	public ImageToggleStrategy (){}
	
	/* (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) {
		this.toggleExpanded = expanded;
		
		if (expandedImg == null 
				|| collapsedImg == null
				|| expandedHoveringImg == null
				|| collapsedHoveringImg == null)
			return;
		
		PGC gcPlus = new PGC(gc,location.x,location.y);
		
		Color back = gcPlus.getBackground();
		Color fore = gcPlus.getForeground();
		
		Rectangle bounds = new Rectangle(0,0,0,0);
		
		if (toggleExpanded){
			if (hovering){
				bounds = expandedHoveringImg.getBounds();
			}else{
				bounds = expandedImg.getBounds();
			}
		}else{
			if (hovering){
				bounds = collapsedHoveringImg.getBounds();
			}else{
				bounds = collapsedImg.getBounds();
			}
		}
		
		if (toggleExpanded){
			if (hovering){
				gcPlus.drawImage(expandedHoveringImg,bounds.x,bounds.y);
			}else{
				gcPlus.drawImage(expandedImg,bounds.x,bounds.y);
			}
		}else{
			if (hovering){
				gcPlus.drawImage(collapsedHoveringImg,bounds.x,bounds.y);
			}else{
				gcPlus.drawImage(collapsedImg,bounds.x,bounds.y);
			}
		}
		
		
		if (hasFocus){
			gcPlus.setBackground(back);
			gcPlus.setForeground(fore);
			gcPlus.drawFocus(bounds.x - 1,bounds.y - 1,bounds.width + 2,bounds.height + 2);
		}

	}

	/* 
	 * Returns the toggle's size (based upon the image).
	 * @see com.swtplus.widgets.toggle.IToggleStrategy#getSize()
	 */
	public Point getSize() {
		Point size = new Point(0,0);
		if (toggleExpanded){
			size.x = expandedImg.getBounds().width;
			size.y = expandedImg.getBounds().height;
		}else{
			size.x = collapsedImg.getBounds().width;
			size.y = collapsedImg.getBounds().height;
		}
		return size;
	}

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

	/* (non-Javadoc)
	 * @see com.swtplus.widgets.toggle.IToggleStrategy#getLocation()
	 */
	public Point getLocation() {
		return location;
	}
	
	public void setExpandedImage(Image image){
			this.expandedImg = image;
	}
	
	public void setCollapsedImage(Image image){
			this.collapsedImg = image;
	}
	
	public void setExpandedHoveringImage(Image image){
			this.expandedHoveringImg = image;
	}
	
	public void setCollapsedHoveringImage(Image image){
			this.collapsedHoveringImg = image;
	}

}