exclusivesinglelineview.java

j2me polish学习的经典代码

//#condition polish.usePolishGui
/*
 * Created on 08-Apr-2005 at 11:17:51.
 * 
 * Copyright (c) 2005 Robert Virkus / Enough Software
 *
 * This file is part of J2ME Polish.
 *
 * J2ME Polish is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * J2ME Polish 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 General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with J2ME Polish; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 * 
 * Commercial licenses are also available, please
 * refer to the accompanying LICENSE.txt or visit
 * http://www.j2mepolish.org for details.
 */
package de.enough.polish.ui.containerviews;

import java.io.IOException;

import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Image;

import de.enough.polish.ui.Background;
import de.enough.polish.ui.ChoiceGroup;
import de.enough.polish.ui.ChoiceItem;
import de.enough.polish.ui.Container;
import de.enough.polish.ui.ContainerView;
import de.enough.polish.ui.Item;
import de.enough.polish.ui.Style;
import de.enough.polish.ui.StyleSheet;

/**
 * <p>Shows only the currently selected item of an exclusive ChoiceGroup or an exclusive List.</p>
 * <p>Apply this view by specifying "view-type: exclusive-single-line;" in your polish.css file.</p>
 *
 * <p>Copyright (c) 2005, 2006 Enough Software</p>
 * <pre>
 * history
 *        08-Apr-2005 - rob creation
 * </pre>
 * @author Robert Virkus, [e-mail]
 */
public class ExclusiveSingleLineView extends ContainerView {
	
	
	private final static int POSITION_BOTH_SIDES = 0; 
	private final static int POSITION_RIGHT = 1; 
	private final static int POSITION_LEFT = 2; 
	private int arrowColor;
	//#ifdef polish.css.exclusiveview-left-arrow
		private Image leftArrow;
		private int leftYOffset;
	//#endif
	//#ifdef polish.css.exclusiveview-right-arrow
		private Image rightArrow;
		private int rightYOffset;
	//#endif
	//#ifdef polish.css.exclusiveview-arrow-position
		private int arrowPosition;
		//#ifdef polish.css.exclusiveview-arrow-padding
			private int arrowPadding;
		//#endif
	//#endif
	private boolean allowRoundTrip;
	//#ifdef polish.css.exclusiveview-expand-background
		private Background background;
		private boolean expandBackground;
	//#endif	
	private int arrowWidth = 10;
	private int currentItemIndex;
	private ChoiceItem currentItem;
	private int leftArrowStartX;
	private int leftArrowEndX;
	private int rightArrowStartX;
	private int rightArrowEndX;
	private int xStart;
	private Background parentBackground;
	//private boolean isInitialized;

	/**
	 * Creates a new view
	 */
	public ExclusiveSingleLineView() {
		super();
	}

	/* (non-Javadoc)
	 * @see de.enough.polish.ui.ContainerView#initContent(de.enough.polish.ui.Container, int, int)
	 */
	protected void initContent(Container parent, int firstLineWidth,
			int lineWidth) 
	{
		//#debug
		System.out.println("Initalizing ExclusiveSingleLineView");
		if (this.isFocused && this.parentBackground == null) {
			Background bg = parent.background;
			if (bg != null) {
				this.parentBackground = bg; 
				parent.background = null;
			}
			//System.out.println("EXCLUSIVE:   INIT CONTENT WITH NO PARENT BG, now parentBackround != null: " + (this.parentBackground != null));
		}
		int selectedItemIndex = ((ChoiceGroup) parent).getSelectedIndex();
		if (selectedItemIndex == -1) {
			selectedItemIndex = 0;
		}
		parent.focusedIndex = selectedItemIndex;
		int height = 0;
		//#if polish.css.exclusiveview-left-arrow || polish.css.exclusiveview-right-arrow
			int width = 0;
			//#ifdef polish.css.exclusiveview-left-arrow
				if (this.leftArrow != null) {
					width = this.leftArrow.getWidth();
					height = this.leftArrow.getHeight();
				}
			//#endif
			//#ifdef polish.css.exclusiveview-right-arrow
				if (this.rightArrow != null) {
					if ( this.rightArrow.getWidth() > width) {
						width = this.rightArrow.getWidth();
						if (this.leftArrow.getHeight() > height) {
							height = this.leftArrow.getHeight();
						}
					}
				}
			//#endif
			//#if polish.css.exclusiveview-left-arrow && polish.css.exclusiveview-right-arrow
				if (this.rightArrow != null && this.leftArrow != null) {
					this.arrowWidth = width;
				} else {
			//#endif
					if (width > this.arrowWidth) {
						this.arrowWidth = width;
					}
			//#if polish.css.exclusiveview-left-arrow && polish.css.exclusiveview-right-arrow
				}
			//#endif
		//#endif
		//#if polish.css.exclusiveview-arrow-padding
			int completeArrowWidth = ( this.arrowWidth * 2 ) + this.paddingHorizontal + this.arrowPadding;
		//#else
			//# int completeArrowWidth = ( this.arrowWidth + this.paddingHorizontal ) << 1;
		//#endif
		//#ifdef polish.css.exclusiveview-arrow-position
			if (this.arrowPosition == POSITION_BOTH_SIDES) {
		//#endif
				this.leftArrowStartX = 0;
				this.leftArrowEndX = this.arrowWidth;
				this.rightArrowStartX = lineWidth - this.arrowWidth;
				this.rightArrowEndX = lineWidth;
		//#ifdef polish.css.exclusiveview-arrow-position
			} else if (this.arrowPosition == POSITION_RIGHT ){
				this.leftArrowStartX = lineWidth - completeArrowWidth + this.paddingHorizontal;
				this.leftArrowEndX = this.leftArrowStartX + this.arrowWidth;
				this.rightArrowStartX = lineWidth - this.arrowWidth;
				this.rightArrowEndX = lineWidth;
			} else {
				this.leftArrowStartX = 0;
				this.leftArrowEndX = this.arrowWidth;
				this.rightArrowStartX = this.arrowWidth + this.paddingHorizontal;
				this.rightArrowEndX = this.rightArrowStartX + this.arrowWidth;
			}
		//#endif
		lineWidth -= completeArrowWidth;
		int selectedItemHeight = 0;
		if (selectedItemIndex < parent.size() ) {
			ChoiceItem selectedItem = (ChoiceItem) parent.get( selectedItemIndex );
			selectedItem.drawBox = false;
			selectedItemHeight = selectedItem.getItemHeight(lineWidth, lineWidth);
			this.contentWidth = selectedItem.getItemWidth( lineWidth, lineWidth ) + completeArrowWidth;
			this.appearanceMode = Item.INTERACTIVE;
			this.currentItem = selectedItem;
			this.currentItemIndex = selectedItemIndex;
		} else {
			this.appearanceMode = Item.PLAIN;
			if (this.isLayoutExpand()) {
				this.contentWidth = lineWidth + completeArrowWidth;
			} else {
				this.contentWidth = this.paddingHorizontal + completeArrowWidth;
			}
		}
		if (selectedItemHeight > height) {
			this.contentHeight = selectedItemHeight;
		} else {
			this.contentHeight = height;
		}
		//if ( selectedItem.isFocused ) {
			//System.out.println("Exclusive Single Line View: contentHeight=" + this.contentHeight);
		//}
		//this.isInitialized = true;
		
		//#if polish.css.exclusiveview-left-arrow			
			if (this.leftArrow != null) {
				this.leftYOffset = (this.contentHeight - this.leftArrow.getHeight()) / 2; // always center vertically
			}
		//#endif
		//#if polish.css.exclusiveview-right-arrow
			if (this.rightArrow != null) {
				this.rightYOffset = (this.contentHeight - this.rightArrow.getHeight()) / 2; // always center vertically
			}
		//#endif

		
//		System.out.println("leftX=" + this.leftArrowStartX);
//		System.out.println("rightX=" + this.rightArrowStartX);
//		System.out.println("arrowColor=" + Integer.toHexString(this.arrowColor));
	}
	
	

	protected void setStyle(Style style) {
		//#ifdef polish.css.exclusiveview-expand-background
			Boolean expandBackgroundBool = style.getBooleanProperty("exclusiveview-expand-background");
			if (expandBackgroundBool != null) {
				this.expandBackground = expandBackgroundBool.booleanValue(); 
			}
			if (this.expandBackground) {
				this.background = style.background;				
			}
		//#endif
		super.setStyle(style);
		//#ifdef polish.css.exclusiveview-left-arrow
			String leftArrowUrl = style.getProperty("exclusiveview-left-arrow");
			if (leftArrowUrl != null) {
				try {
					this.leftArrow = StyleSheet.getImage( leftArrowUrl, this, true );
				} catch (IOException e) {
					//#debug error
					System.out.println("Unable to load left arrow image [" + leftArrowUrl + "]" + e );
				}
			}
		//#endif
		//#ifdef polish.css.exclusiveview-right-arrow
			String rightArrowUrl = style.getProperty("exclusiveview-right-arrow");
			if (rightArrowUrl != null) {
				try {
					this.rightArrow = StyleSheet.getImage( rightArrowUrl, this, true );
				} catch (IOException e) {
					//#debug error
					System.out.println("Unable to load right arrow image [" + rightArrowUrl + "]" + e );
				}
			}
		//#endif
		//#ifdef polish.css.exclusiveview-arrow-color
			Integer colorInt = style.getIntProperty("exclusiveview-arrow-color");
			if ( colorInt != null ) {
				this.arrowColor = colorInt.intValue();
			}
		//#endif