simplegroupstrategy.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.group;

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.ControlEvent;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;

import com.swtplus.internal.TextUtils;
import com.swtplus.widgets.toggle.IToggleStrategy;

/**
 * SimpleGroupStrategy adds a seperator to the normal PGroup's image and text.
 * <p>
 * <b>Styles:</b>
 * <ul>
 * <li>TOGGLE_LEFT</li>
 * <li>IMAGE_RIGHT</li>
 * <li>LINE_MIDDLE</li>
 * <li>CENTER_VERTICALLY</li>
 * </ul>
 * 
 * @since 1.0
 *
 * @author chris
 */
public class SimpleGroupStrategy extends AbstractGroupStrategy {
	/**
	 * Places the toggle on the left.
	 */
	public static final int TOGGLE_LEFT = 1 << 2;
	/**
	 * Places the image on the right
	 */
	public static final int IMAGE_RIGHT = 1 << 4;
	/**
	 * Paints the seperator line trailing after the text 
	 * rather than on the bottom.
	 */
	public static final int LINE_MIDDLE = 1 << 5;
	/**
	 * Centers vertically the image, text and toggle.
	 */
	public static final int CENTER_VERTICALLY = 1 << 8;
	
	private int separatorHeight = 2;
	
    private boolean imageLeft = true;
    private boolean toggleLeft = false;
    private boolean lineBottom = true;
    private boolean centerVertically = false;
	
    
    private int heightWithoutLine = 0;
    
    private int lineMargin = 2;
	private int lineBetweenSpacing = 8;
	private int titleTextMargin = 0;
	private int betweenSpacing = 6;
	
	private int vMargin = 3;
	private int hMargin = 3;
    
    

    /**
     * Creates a SimpleGroupStrategy with the given style without a toggle.
     * 
     * @param style
     */
    public SimpleGroupStrategy(int style) {
        super(style);
        if ((style & TOGGLE_LEFT) == TOGGLE_LEFT)
            toggleLeft = true;
        if ((style & IMAGE_RIGHT) == IMAGE_RIGHT)
            imageLeft = false;
        if ((style & LINE_MIDDLE) == LINE_MIDDLE)
            lineBottom = false;		
        if ((style & CENTER_VERTICALLY) == CENTER_VERTICALLY)
			centerVertically = true;
        
    }
    
    /**
     * Creates a SimpleGroupStrategy with the given toggle and style.
     * 
     * @param ts
     * @param style
     */
    public SimpleGroupStrategy(IToggleStrategy ts, int style){
        super (ts, style);
        if ((style & TOGGLE_LEFT) == TOGGLE_LEFT)
            toggleLeft = true;
        if ((style & IMAGE_RIGHT) == IMAGE_RIGHT)
            imageLeft = false;
        if ((style & LINE_MIDDLE) == LINE_MIDDLE)
            lineBottom = false;
        if ((style & CENTER_VERTICALLY) == CENTER_VERTICALLY)
			centerVertically = true;

    }


    /* (non-Javadoc)
     * @see com.swtplus.widgets.AbstractGroupStrategy#paintGroup(org.eclipse.swt.graphics.GC)
     */
    public void paintGroup(GC gc) {
        gc.fillRectangle(0,0,getGroup().getSize().x,getTitleHeight());
        
        if (getGroup().getImage() != null){
            int imgX = 0,imgY = 0;
            if (imageLeft){
                imgX = hMargin;
                if (toggleLeft && (getToggleStrategy() != null)){
                    imgX += getToggleStrategy().getSize().x + betweenSpacing;
                }
            } else {
                imgX = getGroup().getSize().x - getGroup().getImage().getBounds().width - hMargin;
                if (!toggleLeft && (getToggleStrategy() != null)){
                    imgX -= getToggleStrategy().getSize().x + betweenSpacing;
                }
            }
            if (centerVertically){
                imgY = (heightWithoutLine - getGroup().getImage().getBounds().height)/2;
            } else {
                imgY = heightWithoutLine - getGroup().getImage().getBounds().height - vMargin;
            }
            gc.drawImage(getGroup().getImage(),imgX,imgY);
        }
        
        int textX = hMargin;
        
        if (imageLeft && (getGroup().getImage() != null)){
            textX += getGroup().getImage().getBounds().width + betweenSpacing;
        }
        if (toggleLeft && (getToggleStrategy() != null)){
            textX += getToggleStrategy().getSize().x + betweenSpacing;
        }

        int textWidth = getGroup().getSize().x - textX - hMargin;
        if (!imageLeft && (getGroup().getImage() != null)){
            textWidth -= getGroup().getImage().getBounds().width + betweenSpacing;
        }
        if (!toggleLeft && (getToggleStrategy() != null)){
            textWidth -= getToggleStrategy().getSize().x + betweenSpacing;
        }
        
        int textY = 0;
        if (centerVertically){
            textY = (heightWithoutLine - getFontHeight())/2;
        } else {            
            textY = heightWithoutLine - (getFontHeight() + (titleTextMargin) + (vMargin));
        }
		
		if (getToggleStrategy() != null){
			int toggleHeight = getToggleStrategy().getSize().y;
			int fontHeight = getFontHeight();
			if (toggleHeight > fontHeight){
				int toggleY = ((heightWithoutLine - toggleHeight)/2);
				int difference = (toggleHeight - fontHeight) /2;
				textY = toggleY + difference;
			}
		}
        
        gc.drawString(TextUtils.getShortString(gc,getGroup().getText(),textWidth),textX,textY);
		
		int x = 0,x2 = 0,y = 0;
		if (lineBottom){
			x = 0;
			x2 = getGroup().getSize().x;
			y = getTitleHeight() - separatorHeight - lineMargin;
		} else {
			Point p = gc.stringExtent(TextUtils.getShortString(gc,getGroup().getText(),textWidth));
			
			x = textX + p.x + lineBetweenSpacing;
			x2 = textX + p.x + betweenSpacing + (textWidth - p.x) - lineBetweenSpacing;
			y = textY + (p.y /2);
			
		}
		
		if (x2 > x){
			gc.setForeground(getGroup().getDisplay().getSystemColor(SWT.COLOR_WIDGET_NORMAL_SHADOW));
			gc.drawLine(x,y,x2,y);
			
			gc.setForeground(getGroup().getDisplay().getSystemColor(SWT.COLOR_WIDGET_HIGHLIGHT_SHADOW));
			gc.drawLine(x,y + 1,x2,y + 1);
		}
		
        
        if (!getGroup().isExpanded()){
            gc.setBackground(getGroup().getParent().getBackground());
        } else {
           // e.gc.setBackground(parent.getParent().getBackground());
        }
        gc.fillRectangle(0,getTitleHeight(),getGroup().getBounds().width,getGroup().getBounds().height);
    }

    /* (non-Javadoc)
     * @see com.swtplus.widgets.IGroupStrategy#resize(org.eclipse.swt.events.ControlEvent)
     */
    public void resize(ControlEvent e) {

        if (getToggleStrategy() != null){
            int toggleY = 0;
            if (centerVertically){
                toggleY = (heightWithoutLine - getToggleStrategy().getSize().y)/2;
            } else {            
                toggleY = (heightWithoutLine - getToggleStrategy().getSize().y) - vMargin;
                //toggleY += ((getFontHeight() + (2*titleTextMargin) + (2*vMargin)) - getToggleStrategy().getSize().y)/2;
            }    
            
            if (toggleLeft){
                getToggleStrategy().setLocation(new Point(hMargin,toggleY));
            } else {
                getToggleStrategy().setLocation(new Point(getGroup().getSize().x - hMargin - getToggleStrategy().getSize().x,toggleY));
            }
        }   
        getGroup().getBody().setBounds(0,getTitleHeight(),getGroup().getSize().x,getGroup().getSize().y - getTitleHeight());
    }

    /* (non-Javadoc)
     * @see com.swtplus.widgets.IGroupStrategy#computeSize(int, int, boolean)
     */
    public Point computeSize(int wHint, int hHint, boolean changed) {
        Point size = new Point(0,0);
        
 
        int decorationsWidth = (2*hMargin);
        if (getToggleStrategy() != null)
            decorationsWidth += getToggleStrategy().getSize().x + betweenSpacing;
        if (getGroup().getImage() != null)
            decorationsWidth += getGroup().getImage().getBounds().width + betweenSpacing;
        
        
        //figure out the size of the body for use later
        Point bodySize;
        int body_wHint = SWT.DEFAULT,body_hHint = SWT.DEFAULT;
        if (wHint != SWT.DEFAULT)
            body_wHint = wHint;
        if (hHint != SWT.DEFAULT)
            body_hHint = hHint - getTitleHeight();
        bodySize = getGroup().getBody().computeSize(body_wHint,body_hHint,changed);
        
        int textWidth = getTextWidth();
        
        if (wHint == SWT.DEFAULT){
            size.x = Math.max(decorationsWidth + textWidth,bodySize.x);
        } else {
            size.x = Math.max(decorationsWidth + 50,bodySize.x);
            size.x = Math.max(size.x,wHint); 
        }
        
        if (getGroup().isExpanded()){
            size.y = getTitleHeight() + bodySize.y;
        } else {
            size.y = getTitleHeight();
        }
        
        return size;
    }

    /* (non-Javadoc)
     * @see com.swtplus.widgets.AbstractGroupStrategy#computeTitleHeight()
     */
    public int computeTitleHeight() {
		int h = 0;
        int imageHeight = 0;
        
        if (getGroup().getImage() != null)
			imageHeight = getGroup().getImage().getBounds().height;
			h = Math.max(getFontHeight() + (2*titleTextMargin) + (2*vMargin),imageHeight + (2*vMargin));
		if (getToggleStrategy() != null){
			int toggleHeight = getToggleStrategy().getSize().y + (2*vMargin);
			h = Math.max(toggleHeight + (2*vMargin), h);
		}
		heightWithoutLine = h;
        if (lineBottom){
            h += separatorHeight;
            h += (2*lineMargin);
        }
		
		return h;
    }

    /* (non-Javadoc)
     * @see com.swtplus.widgets.AbstractGroupStrategy#computeActiveBounds()
     */
    public Rectangle computeActiveBounds() {
		return new Rectangle(0,0,getGroup().getSize().x,getTitleHeight());
    }

	/* (non-Javadoc)
	 * @see com.swtplus.widgets.IGroupStrategy#dispose()
	 */
	public void dispose() {
	}


}