formgroupstrategy.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.Color;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.RGB;
import org.eclipse.swt.graphics.Rectangle;

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

/**
 * FormGroupStrategy makes a PGroup mimic the look and feel of an Eclipse Form
 * Section.  
 * <p>
 * <b>Styles:</b>
 * <ul>
 * <li>TOGGLE_LEFT</li>
 * <li>IMAGE_RIGHT</li>
 * </ul>
 * 
 * @since 1.0
 *
 * @author chris
 */
public class FormGroupStrategy extends AbstractGroupStrategy {
	/**
	 * Places the toggle on the left.
	 */
	public static final int TOGGLE_LEFT = 1 << 1;
	/**
	 * Places the image on the right
	 */
	public static final int IMAGE_RIGHT = 1 << 4;
	
	
	private boolean imageLeft = true;
    private boolean toggleLeft = false;

	private Color initialBackColor;
    private Color initialBorderColor;
    
    private int titleTextMargin = 2;
	private int betweenSpacing = 6;
	private int margin = 0;
	
	private int vMargin = 2;
	private int hMargin = 6;
	
	private Color borderColor;
	
	
    /* (non-Javadoc)
	 * @see com.swtplus.widgets.AbstractGroupStrategy#initialize(com.swtplus.widgets.PGroup)
	 */
	public void initialize(PGroup sg) {
		super.initialize(sg);
		initializeColors();
	}


    /**
     * Creates a FormGroupStrategy with the given style without any toggle.
     * 
     * @param style
     */
    public FormGroupStrategy(int style) {
        super(style);

		if ((style & TOGGLE_LEFT) == TOGGLE_LEFT)
            toggleLeft = true;
        if ((style & IMAGE_RIGHT) == IMAGE_RIGHT)
            imageLeft = false;
		
    }
    
    /**
     * Creates a FormGroupStrategy with the given toggle and style.
     * 
     * @param toggle
     * @param style
     */
    public FormGroupStrategy(IToggleStrategy toggle, int style) {
        super(toggle, style);

		if ((style & TOGGLE_LEFT) == TOGGLE_LEFT)
            toggleLeft = true;
        if ((style & IMAGE_RIGHT) == IMAGE_RIGHT)
            imageLeft = false;
		
    }
    
   

    /* (non-Javadoc)
     * @see com.swtplus.widgets.AbstractGroupStrategy#paintGroup(org.eclipse.swt.graphics.GC)
     */
    public void paintGroup(GC gc) {

       Point textPoint = new Point (0,0);
		//int textWidth = 0;

        Point imagePoint = new Point (0,0);
  
        Color back = gc.getBackground();
        Color fore = gc.getForeground();
        gc.setForeground(gc.getBackground());
        gc.setBackground(getGroup().getBody().getBackground());
        gc.fillGradientRectangle(0,0,getGroup().getSize().x,getTitleHeight(),true);
        gc.setForeground(borderColor);
        GraphicUtils.drawRoundRectangle(gc,0,0,getGroup().getSize().x -1,getTitleHeight(),getGroup().getParent().getBackground(),true,false);
 
        gc.setForeground(getGroup().getBody().getBackground());
        
        if (getGroup().isExpanded())
            gc.drawLine(1,getTitleHeight() -1,getGroup().getSize().x - 2,getTitleHeight() -1);
        
        gc.setBackground(back);
        gc.setForeground(fore);
		
		Image image = getGroup().getImage();
        
		if (image != null){
			imagePoint.x = hMargin;
			if (imageLeft){
				if (getToggleStrategy() != null){
					if (toggleLeft){
						imagePoint.x += getToggleStrategy().getSize().x + betweenSpacing;
					}
				}	
			}else {
				if (getToggleStrategy() != null){
					if (toggleLeft){
						imagePoint.x = getGroup().getSize().x - (hMargin + image.getBounds().width );
					}else{
						imagePoint.x = getGroup().getSize().x - (hMargin + image.getBounds().width + getToggleStrategy().getSize().x+ betweenSpacing);
					}
				}else {	
					imagePoint.x = getGroup().getSize().x - (hMargin + image.getBounds().width );
				}
			}
			imagePoint.y = ((getTitleHeight() - image.getBounds().height)/2);
			gc.drawImage(image,imagePoint.x,imagePoint.y);
		}
        
		// Paint Text
		
		// First, compute the starting text point 

		// Part 1, Image
		
		textPoint.x = hMargin;
		textPoint.y = (getTitleHeight() - getFontHeight()) /2;

		if (image != null){
			if (imageLeft){
				textPoint.x += image.getBounds().width + betweenSpacing;
			}
		} 
		
		// Part 2, Toggle
		
		if (getToggleStrategy() != null){
			if (toggleLeft){
				textPoint.x += getToggleStrategy().getSize().x + betweenSpacing;
			}
		}
		
		// Now calculate the width of the text
		
		int textWidth = getGroup().getSize().x - (hMargin *2);
		
		// Part 1, Image
		
		if (image != null){
			textWidth -= (image.getBounds().width + betweenSpacing);
		}
		
		// Part 2, Toggle
		
		if (getToggleStrategy() != null){
			textWidth -= getToggleStrategy().getSize().x  + betweenSpacing;
		}
		
		gc.drawText(TextUtils.getShortString(gc,getGroup().getText(),textWidth),textPoint.x,textPoint.y, true);
		
        if (!getGroup().isExpanded()){
            gc.setBackground(getGroup().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) {
            Point p = getToggleStrategy().getSize();
            int toggleY = 0;
            
            toggleY = (getTitleHeight() - p.y)/2;

            int toggleX = 0;
            if (toggleLeft){
                toggleX = hMargin;
            } else {
                toggleX = getGroup().getSize().x - hMargin - p.x ;
            }
			getToggleStrategy().setLocation(new Point(toggleX,toggleY));
        }

		getGroup().getBody().setBounds(margin,getTitleHeight(),getGroup().getSize().x - (2*margin),getGroup().getSize().y - getTitleHeight() - margin);
    }

    /* (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);
		
		Point textPoint = new Point (0,0);
		
        //figure out min width
        int decorationsWidth = 0;
        if (getGroup().getImage() != null){
            decorationsWidth += hMargin + getGroup().getImage().getBounds().width + betweenSpacing; 
        } else {
            decorationsWidth += hMargin;
        }
        decorationsWidth += hMargin;
        if (getToggleStrategy() != null)
            decorationsWidth += getToggleStrategy().getSize().x  + hMargin + 3;
        
        
        //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 - (2*margin);
        if (hHint != SWT.DEFAULT){
            body_hHint = hHint - getTitleHeight();
        }
            
        bodySize = getGroup().getBody().computeSize(body_wHint,body_hHint,changed);
        
		   textPoint.x = hMargin;
	        if (getGroup().getImage() != null && imageLeft){
	            textPoint.x += getGroup().getImage().getBounds().width + betweenSpacing;
	        }
	        if (getToggleStrategy() != null && toggleLeft){
	            textPoint.x += getToggleStrategy().getSize().x + betweenSpacing;
	        }

		
		
        int textWidth = getTextWidth();
       
		if (wHint == SWT.DEFAULT){
            int titleWidth = decorationsWidth + textWidth;
            size.x = Math.max(titleWidth,bodySize.x + (2*margin));
		} else {
            int minWidth = decorationsWidth + 50;
            size.x = Math.max(minWidth,bodySize.x + (2*margin));
            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 height = 0;
		
		if (getGroup().getImage() != null)
            height = getGroup().getImage().getBounds().height + (2*vMargin);
		
		if (getToggleStrategy() != null){
			int toggleHeight = getToggleStrategy().getSize().y;
			height = Math.max(toggleHeight + (2*vMargin), height);
		}
        return Math.max(getFontHeight() + (2*titleTextMargin) + (2*vMargin),height);
    }

    /* (non-Javadoc)
     * @see com.swtplus.widgets.AbstractGroupStrategy#computeActiveBounds()
     */
    public Rectangle computeActiveBounds() {
        Point textPoint = new Point (0,0);
      
        textPoint.x = hMargin;
        if (getGroup().getImage() != null && imageLeft){
            textPoint.x += getGroup().getImage().getBounds().width + betweenSpacing;
        }
        if (getToggleStrategy() != null && toggleLeft){
            textPoint.x += getToggleStrategy().getSize().x + betweenSpacing;
        }

        
        textPoint.y = (getTitleHeight() - getFontHeight()) /2;

        int textWidth = getGroup().getSize().x - textPoint.x - hMargin;
        
        if (getToggleStrategy() != null && !toggleLeft)
            textWidth -= getToggleStrategy().getSize().x  + betweenSpacing;
        
        if (getGroup().getImage() != null && !imageLeft)
            textWidth -= getGroup().getImage().getBounds().width  + betweenSpacing;
        
        return new Rectangle(textPoint.x,textPoint.y,textWidth,getFontHeight());
        
    }
    
    /* (non-Javadoc)
     * @see com.swtplus.widgets.IGroupStrategy#dispose()
     */
    public void dispose() {
        if (initialBackColor != null)
            initialBackColor.dispose();
        if (initialBorderColor != null)
            initialBorderColor.dispose();
    }
    
    /**
     * Initializes the Form Group's colors.
     */
    private void initializeColors() {
		getGroup().getBody().setBackground(getGroup().getBody().getDisplay().getSystemColor(SWT.COLOR_LIST_BACKGROUND));
		
    	RGB borderRGB = GraphicUtils.blend(getGroup().getDisplay().getSystemColor(SWT.COLOR_TITLE_INACTIVE_BACKGROUND_GRADIENT).getRGB(),getGroup().getDisplay().getSystemColor(SWT.COLOR_LIST_BACKGROUND).getRGB(),100);
    	initialBorderColor = new Color(getGroup().getDisplay(),borderRGB);
    	borderColor = initialBorderColor;
    	
    	RGB backRGB = GraphicUtils.blend(getGroup().getDisplay().getSystemColor(SWT.COLOR_TITLE_BACKGROUND_GRADIENT).getRGB(),getGroup().getBody().getDisplay().getSystemColor(SWT.COLOR_LIST_BACKGROUND).getRGB(),40);
    	initialBackColor = new Color(getGroup().getDisplay(),backRGB);
		getGroup().setBackground(initialBackColor);

    }

	/**
	 * @return Returns the borderColor.
	 */
	public Color getBorderColor() {
		return borderColor;
	}
	

	/**
	 * @param borderColor The borderColor to set.
	 */
	public void setBorderColor(Color borderColor) {
		this.borderColor = borderColor;
	}
	
	
}