GLabel.java

/*
  Part of the GUI library for Processing 
  	http://www.lagers.org.uk/g4p/index.html
	http://sourceforge.net/projects/g4p/files/?source=navbar

  Copyright (c) 2012 Peter Lager

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.

  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General
  Public License along with this library; if not, write to the
  Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  Boston, MA  02111-1307  USA
 */

package automenta.vivisect.gui;

import automenta.vivisect.gui.StyledString.TextLayoutInfo;

import java.awt.Graphics2D;
import java.awt.font.TextLayout;
import java.util.LinkedList;

import processing.core.PApplet;

/**
 * The label component.
 * 
 * This control can display text with/without an icon. 
 * 
 * @author Peter Lager
 *
 */
public class GLabel extends GTextIconAlignBase {

	public GLabel(PApplet theApplet, float p0, float p1, float p2, float p3) {
		this(theApplet, p0, p1, p2, p3, "    ");
	}	
		
	/**
	 * Create a label control.
	 * 
	 * use setIcon to add an icon
	 * 
	 * @param theApplet
	 * @param p0
	 * @param p1
	 * @param p2
	 * @param p3
	 * @param text
	 */
	public GLabel(PApplet theApplet, float p0, float p1, float p2, float p3, String text) {
		super(theApplet, p0, p1, p2, p3);
		setText(text);
		opaque = false;
		// Now register control with applet
		registeredMethods = DRAW_METHOD;
		GUI.addControl(this);
	}

	public void draw(){
		if(!visible) return;

		// Update buffer if invalid
		updateBuffer();
		winApp.pushStyle();

		winApp.pushMatrix();
		// Perform the rotation
		applyTransform();
		// Move matrix to line up with top-left corner
		winApp.translate(-halfWidth, -halfHeight);
		// Draw buffer
		winApp.imageMode(PApplet.CORNER);
		if(alphaLevel < 255)
			winApp.tint(TINT_FOR_ALPHA, alphaLevel);
		winApp.image(buffer, 0, 0);	
		winApp.popMatrix();
		
		winApp.popStyle();
	}
	
	protected void updateBuffer(){
		if(bufferInvalid) {
			Graphics2D g2d = buffer.g2;
			// Get the latest lines of text
			LinkedList<TextLayoutInfo> lines = stext.getLines(g2d);	
			bufferInvalid = false;
			buffer.beginDraw();
			// Back ground colour
			buffer.background(opaque ? palette[6] : palette[2] & 0xFFFFFF);
			// Calculate text and icon placement
			calcAlignment();
			// If there is an icon draw it
			if(iconW != 0)
				buffer.image(bicon[0], siX, siY);
			float wrapWidth = stext.getWrapWidth();
			float sx = 0, tw = 0;
			buffer.translate(stX, stY);
			for(TextLayoutInfo lineInfo : lines){
				TextLayout layout = lineInfo.layout;
				buffer.translate(0, layout.getAscent());
				switch(textAlignH){
				case CENTER:
					tw = layout.getVisibleAdvance();
					tw = (tw > wrapWidth) ? tw - wrapWidth : tw;
					sx = (wrapWidth - tw)/2;
					break;
				case RIGHT:
					tw = layout.getVisibleAdvance();
					tw = (tw > wrapWidth) ? tw - wrapWidth : tw;
					sx = wrapWidth - tw;
					break;
				case LEFT:
				case JUSTIFY:
				default:
					sx = 0;		
				}
				// display text
				g2d.setColor(jpalette[2]);
				lineInfo.layout.draw(g2d, sx, 0);
				buffer.translate(0, layout.getDescent() + layout.getLeading());
			}
			buffer.endDraw();
		}	
	}

}