exclusivesinglelineview.java

j2me polish学习的经典代码

		//#ifdef polish.css.exclusiveview-arrow-position
			Integer positionInt = style.getIntProperty("exclusiveview-arrow-position");
			if ( positionInt != null ) {
				this.arrowPosition = positionInt.intValue();
			}
			//#ifdef polish.css.exclusiveview-arrow-padding
				Integer arrowPaddingInt = style.getIntProperty("exclusiveview-arrow-padding");
				if (arrowPaddingInt != null) {
					this.arrowPadding = arrowPaddingInt.intValue();
//				} else {
//					this.arrowPadding = style.paddingHorizontal;
				}
			//#endif
		//#endif
		//#ifdef polish.css.exclusiveview-roundtrip
			Boolean allowRoundTripBool = style.getBooleanProperty("exclusiveview-roundtrip");
			if (allowRoundTripBool != null) {
				this.allowRoundTrip = allowRoundTripBool.booleanValue();
			}
		//#endif

	}
	
	
	/* (non-Javadoc)
	 * @see de.enough.polish.ui.ContainerView#paintContent(int, int, int, int, javax.microedition.lcdui.Graphics)
	 */
	protected void paintContent(int x, int y, int leftBorder, int rightBorder,
			Graphics g) 
	{
		//#debug
		System.out.println("ExclusiveView.start: x=" + x + ", y=" + y + ", leftBorder=" + leftBorder + ", rightBorder=" + rightBorder );
		this.xStart = x;
		int modifiedX = x;
		//#ifdef polish.css.exclusiveview-expand-background
			if (this.expandBackground && this.background != null) {
				this.currentItem.background = null;
				this.background.paint(x, y, this.contentWidth, this.contentHeight, g);
			}
		//#endif

		//#ifdef polish.css.exclusiveview-arrow-position
			if (this.arrowPosition == POSITION_BOTH_SIDES ) {
		//#endif
				modifiedX += this.arrowWidth + this.paddingHorizontal;
				leftBorder += this.arrowWidth + this.paddingHorizontal;
		//#ifdef polish.css.exclusiveview-arrow-position
			} else if (this.arrowPosition == POSITION_LEFT ) {
				modifiedX += (this.arrowWidth + this.paddingHorizontal) << 1;
				leftBorder += (this.arrowWidth + this.paddingHorizontal) << 1;
			}
		//#endif	
				

		//#ifdef polish.css.exclusiveview-arrow-position
			if (this.arrowPosition == POSITION_BOTH_SIDES ) {
		//#endif
				rightBorder -= this.arrowWidth + this.paddingHorizontal;
		//#ifdef polish.css.exclusiveview-arrow-position
			} else if (this.arrowPosition == POSITION_RIGHT ) {
				rightBorder -= (this.arrowWidth + this.paddingHorizontal) << 1;
			}
		//#endif

		
		//#debug
		System.out.println("ExclusiveView.item: x=" + modifiedX + ", y=" + y + ", leftBorder=" + leftBorder + ", rightBorder=" + rightBorder + ", availableWidth=" + (rightBorder - leftBorder) + ", itemWidth=" + this.currentItem.itemWidth  );
		if (this.currentItem != null) {
			this.currentItem.paint(modifiedX, y, leftBorder, rightBorder, g);
		}

		g.setColor( this.arrowColor );
		//draw left arrow:
		//#ifdef polish.css.exclusiveview-roundtrip
			if (this.allowRoundTrip || this.currentItemIndex > 0) {
		//#else
			//# if (this.currentItemIndex > 0) {
		//#endif
			// draw left arrow
			int startX = x + this.leftArrowStartX;	
			//#ifdef polish.css.exclusiveview-left-arrow
				if (this.leftArrow != null) {
					//System.out.println("Drawing left IMAGE arrow at " + startX );
					g.drawImage( this.leftArrow, startX, y + this.leftYOffset, Graphics.LEFT | Graphics.TOP );
				} else {
			//#endif
				//#if polish.midp2
					//System.out.println("Drawing left triangle arrow at " + startX );
					g.fillTriangle( 
							startX, y + this.contentHeight/2, 
							startX + this.arrowWidth, y,
							startX + this.arrowWidth, y + this.contentHeight );
				//#else
					int y1 = y + this.contentHeight / 2;
					int x2 = startX + this.arrowWidth;
					int y3 = y + this.contentHeight;
					g.drawLine( startX, y1, x2, y );
					g.drawLine( startX, y1, x2, y3 );
					g.drawLine( x2, y, x2, y3 );
				//#endif
			//#ifdef polish.css.exclusiveview-left-arrow
				}
			//#endif
		}
		
		// draw right arrow:
		//#ifdef polish.css.exclusiveview-roundtrip
			if (this.allowRoundTrip ||  (this.currentItemIndex < this.parentContainer.size() - 1) ) {
		//#else
			//# if (this.currentItemIndex < this.parentContainer.size() - 1) {
		//#endif
			// draw right arrow
			int startX = x + this.rightArrowStartX;	
			//#ifdef polish.css.exclusiveview-right-arrow
				if (this.rightArrow != null) {
					g.drawImage( this.rightArrow, startX, y + this.rightYOffset, Graphics.LEFT | Graphics.TOP );
				} else {
			//#endif
				//#if polish.midp2
					g.fillTriangle( 
							startX + this.arrowWidth, y + this.contentHeight/2, 
							startX, y,
							startX, y + this.contentHeight );
				//#else
					int y1 = y + this.contentHeight / 2;
					int x2 = startX + this.arrowWidth;
					int y3 = y + this.contentHeight;
					g.drawLine( x2, y1, startX, y );
					g.drawLine( x2, y1, startX, y3 );
					g.drawLine( startX, y, startX, y3 );
				//#endif
			//#ifdef polish.css.exclusiveview-right-arrow
				}
			//#endif
		}
	}

	/* (non-Javadoc)
	 * @see de.enough.polish.ui.ContainerView#getNextItem(int, int)
	 */
	protected Item getNextItem(int keyCode, int gameAction) {
		//#debug
		System.out.println("ExclusiveSingleLineView: getNextItem()");
		ChoiceGroup choiceGroup = (ChoiceGroup) this.parentContainer;
		Item[] items = this.parentContainer.getItems();
		if (this.currentItem == null) {
			//#debug warn
			System.out.println("ExclusiveSingleLineView: getNextItem(): no current item defined, it seems the initContent() has been skipped.");
			this.currentItemIndex = choiceGroup.getSelectedIndex();
			this.currentItem = (ChoiceItem) items[ this.currentItemIndex ];
		}
		Item lastItem = this.currentItem;
		//ChoiceItem currentItem = (ChoiceItem) items[ this.currentItemIndex ];
	
		//#ifdef polish.css.exclusiveview-roundtrip
			if ( gameAction == Canvas.LEFT && (this.allowRoundTrip || this.currentItemIndex > 0 )) {
		//#else
			//# if ( gameAction == Canvas.LEFT && this.currentItemIndex > 0 ) {
		//#endif
			this.currentItem.select( false );
			this.currentItemIndex--;
			//#ifdef polish.css.exclusiveview-roundtrip
				if (this.currentItemIndex < 0) {
					this.currentItemIndex = items.length - 1;
				}
			//#endif
			this.currentItem = (ChoiceItem) items[ this.currentItemIndex ];
			this.currentItem.adjustProperties( lastItem );
			//this.currentItem.select( true );
			choiceGroup.setSelectedIndex( this.currentItemIndex, true );
			choiceGroup.notifyStateChanged();
			
			return this.currentItem;
		//#ifdef polish.css.exclusiveview-roundtrip
			} else if ( gameAction == Canvas.RIGHT && (this.allowRoundTrip || this.currentItemIndex < items.length - 1  )) {
		//#else
			} else if ( gameAction == Canvas.RIGHT && this.currentItemIndex < items.length - 1 ) {
		//#endif
			this.currentItem.select( false );
			this.currentItemIndex++;
			//#ifdef polish.css.exclusiveview-roundtrip
				if (this.currentItemIndex >= items.length) {
					this.currentItemIndex = 0;
				}
			//#endif
			this.currentItem = (ChoiceItem) items[ this.currentItemIndex ];
			this.currentItem.adjustProperties( lastItem );
			choiceGroup.setSelectedIndex( this.currentItemIndex, true );
			choiceGroup.notifyStateChanged();
			//this.currentItem.select( true );
			
			return this.currentItem;
		}
		// in all other cases there is no next item:
		return null;
	}

	//#ifdef polish.hasPointerEvents
	/**
	 * Handles pointer pressed events.
	 * This is an optional feature that doesn't need to be implemented by subclasses.
	 * 
	 * @param x the x position of the event
	 * @param y the y position of the event
	 * @return true when the event has been handled. When false is returned the parent container
	 *         will forward the event to the affected item.
	 */
	public boolean handlePointerPressed(int x, int y) {
		if (y < 0 || y > this.contentHeight ) {
			return false;
		}
		Item[] items = this.parentContainer.getItems();
		this.currentItem.select( false );
		x -= this.xStart;
		int index = this.currentItemIndex;
		if ( (index > 0 || this.allowRoundTrip) && x >= this.leftArrowStartX  && x <= this.leftArrowEndX ) {
			index--;
			if (index < 0) {
				index = items.length - 1;
			}
		} else if (! (x >= this.leftArrowStartX  && x <= this.leftArrowEndX && index > 0)) {
			index = ( index + 1) % items.length;
		}
		this.currentItemIndex = index;
		this.currentItem = (ChoiceItem) items[ index ];
		//this.currentItem.select( true );
		((ChoiceGroup) this.parentContainer).setSelectedIndex( this.currentItemIndex, true );
		this.parentContainer.focus(this.currentItemIndex, this.currentItem, 0);
		this.parentContainer.notifyStateChanged();
		return true;
	}
	//#endif

	/* (non-Javadoc)
	 * @see de.enough.polish.ui.ContainerView#defocus(de.enough.polish.ui.Style)
	 */
	protected void defocus(Style originalStyle) {
		if (this.parentBackground != null ) {
			this.parentContainer.background = this.parentBackground;
			this.parentBackground = null;
		}
		super.defocus(originalStyle);
		//System.out.println("EXCLUSIVE:   DEFOCUS!");
	}

	/* (non-Javadoc)
	 * @see de.enough.polish.ui.ContainerView#focus(de.enough.polish.ui.Style, int)
	 */
	public void focus(Style focusstyle, int direction) {
		Background bg = this.parentContainer.background;
		if (bg != null) {
			this.parentBackground = bg; 
			this.parentContainer.background = null;
		}
		//System.out.println("EXCLUSIVE:   FOCUS, parentBackround != null: " + (this.parentBackground != null));
		super.focus(focusstyle, direction);
	}
	
	
}