screen.java

j2me polish学习的经典代码

				// when the previous screen was in the "normal" mode:
				//#if ! tmp.fullScreenInPaint
					//# super.setFullScreenMode( true );
				//#endif
			//#endif
		
			// init components:
			int	width = this.screenWidth - (this.marginLeft + this.marginRight);
			//#ifdef tmp.menuFullScreen
				//#ifdef tmp.useExternalMenuBar
					if (!this.menuBar.isInitialised) {
						this.menuBar.init( width, width );
					}
				//#else
					if (this.menuOpened) {
						if (!this.menuContainer.isInitialised) {
							this.menuContainer.init( width, width );
						}
					} else
				//#endif
			//#endif
			if (this.container != null && !this.container.isInitialised) {
				this.container.init( width, width );
			}
			if (this.gauge != null && !this.gauge.isInitialised) {
				this.gauge.init( width, width );
			}
			//#ifdef tmp.usingTitle
				if (this.title != null && !this.title.isInitialised) {
					this.title.init( width, width );
				}
			//#endif
			//#ifndef polish.skipTicker
				if (this.ticker != null && !this.ticker.isInitialised) {
					this.ticker.init( width, width );					
				}
			//#endif
			calculateContentArea(0, 0, this.screenWidth, this.screenHeight);

		} catch (Exception e) {
			//#debug error
			System.out.println("error while calling showNotify" + e );
		}

		// register this screen:
		StyleSheet.currentScreen = this;

		//#ifdef polish.Vendor.Siemens
			this.showNotifyTime = System.currentTimeMillis();
		//#endif
	}
	
	/**
	 * Unregisters this screen and notifies all items that they will not be shown anymore.
	 */
	public void hideNotify() {
		//#if polish.css.repaint-previous-screen
			//#if polish.Screen.dontBufferPreviousScreen
				this.previousScreen = null;
			//#else
				this.previousScreenImage = null;
			//#endif
			//#if !polish.Bugs.noTranslucencyWithDrawRgb
				this.previousScreenOverlayBackground = null;
			//#endif
		//#endif
		//#ifdef polish.Vendor.Siemens
			// Siemens sometimes calls hideNotify directly
			// after showNotify for some reason.
			// So hideNotify checks how long the screen
			// has been shown - if not long enough,
			// the call will be ignored:
			if (System.currentTimeMillis() - this.showNotifyTime < 500) {
				//#debug
				System.out.println("Ignoring hideNotify on Siemens");
				return;
			}
		//#endif
		//#debug
		System.out.println("hideNotify " + this);
		//#if !polish.css.repaint-previous-screen
			// un-register this screen:
			if (StyleSheet.currentScreen == this) {
				StyleSheet.currentScreen = null;
			}
		//#endif
		Item[] items = getRootItems();
		for (int i = 0; i < items.length; i++) {
			Item item = items[i];
			item.hideNotify();
		}
		if (this.container != null) {
			this.container.hideNotify();
		}
		//#ifdef tmp.ignoreMotorolaTitleCall
			this.ignoreMotorolaTitleCall = true;
		//#endif
	}
	
	/**
	 * Sets the style of this screen.
	 * 
	 * @param style the style
	 */
	public void setStyle(Style style) {
		if (style != this.style ) {
			this.style.releaseResources();
		}
	 	
		System.out.println("Setting screen-style for " + getClass().getName() );
		this.style = style;
		this.background = style.background;
		this.border = style.border;
		this.marginTop = style.marginTop;
		this.marginBottom = style.marginBottom;
		this.marginLeft = style.marginRight;
		this.marginRight = style.marginRight;
		if (this.container != null) {
			// use the same style for the container - but ignore the background and border settings:
			this.container.setStyle(style, true);
		}
		this.isLayoutVCenter = (( style.layout & Item.LAYOUT_VCENTER ) == Item.LAYOUT_VCENTER);
		this.isLayoutBottom = !this.isLayoutVCenter 
							&& (( style.layout & Item.LAYOUT_BOTTOM ) == Item.LAYOUT_BOTTOM);
		this.isLayoutCenter = (( style.layout & Item.LAYOUT_CENTER ) == Item.LAYOUT_CENTER);
		this.isLayoutRight = !this.isLayoutCenter
							&& (( style.layout & Item.LAYOUT_RIGHT ) == Item.LAYOUT_RIGHT);
		this.isLayoutHorizontalShrink = (style.layout & Item.LAYOUT_SHRINK) == Item.LAYOUT_SHRINK; 
		this.isLayoutVerticalShrink = (style.layout & Item.LAYOUT_VSHRINK) == Item.LAYOUT_VSHRINK; 
		//#if polish.css.scrollindicator-up-image && !tmp.useScrollBar
			String scrollUpUrl = style.getProperty("scrollindicator-up-image");
			if (scrollUpUrl != null) {
				try {
					this.scrollIndicatorUpImage = StyleSheet.getImage(scrollUpUrl, null, true);
				} catch (IOException e) {
					//#debug error
					System.out.println("Unable to load scroll up image" + e );
				}
			} else {
				this.scrollIndicatorUpImage = null;
			}
		//#endif		
		//#if polish.css.scrollindicator-down-image && !tmp.useScrollBar
			String scrollDownUrl = style.getProperty("scrollindicator-down-image");
			if (scrollDownUrl != null) {
				try {
					this.scrollIndicatorDownImage = StyleSheet.getImage(scrollDownUrl, null, true);
				} catch (IOException e) {
					//#debug error
					System.out.println("Unable to load scroll down image" + e );
				}
			} else {
				this.scrollIndicatorDownImage = null;
			}
		//#endif		
		//#if polish.css.scrollindicator-up-image && polish.css.scrollindicator-down-image && !tmp.useScrollBar
			if (this.scrollIndicatorUpImage != null && this.scrollIndicatorDownImage != null) {
				int height = this.scrollIndicatorUpImage.getHeight() + this.scrollIndicatorDownImage.getHeight();
				int width = Math.max( this.scrollIndicatorUpImage.getWidth(), this.scrollIndicatorDownImage.getWidth() );
				this.scrollIndicatorWidth = width;
				this.scrollIndicatorX = this.screenWidth / 2 - width / 2;
				//#ifdef tmp.menuFullScreen
					//#ifdef tmp.useExternalMenuBar
						this.scrollIndicatorY = this.fullScreenHeight - (this.menuBar.marginBottom + 1 + height);
					//#else
						this.scrollIndicatorY = this.fullScreenHeight - (height + 1);
					//#endif					
				//#elif polish.vendor.Siemens
					// set the position of scroll indicator for Siemens devices 
					// on the left side, so that the menu-indicator is visible:
					this.scrollIndicatorWidth = width;
					this.scrollIndicatorX = 0;
					this.scrollIndicatorY = this.screenHeight - height - 1;
				//#else
					// set position of scroll indicator:
					this.scrollIndicatorWidth = width;
					this.scrollIndicatorX = this.screenWidth - width - 1;
					this.scrollIndicatorY = this.screenHeight - height - 1;
				//#endif					
			}
		//#endif

		//#if polish.css.scrollindicator-color && !tmp.useScrollBar
			Integer scrollIndicatorColorInt = style.getIntProperty( "scrollindicator-color" );
			if (scrollIndicatorColorInt != null) {
				this.scrollIndicatorColor = scrollIndicatorColorInt.intValue();
			}
		//#endif
		//#if tmp.usingTitle && polish.css.title-style
			this.titleStyle = (Style) style.getObjectProperty("title-style");
			if (this.titleStyle != null && this.title != null) {
				this.title.setStyle(this.titleStyle);
				int width = this.screenWidth - (this.marginLeft + this.marginRight);
				this.titleHeight = this.title.getItemHeight( width, width );
			} else {
		//#endif
		 //#if tmp.usingTitle
		 	if (this.title != null && this.title.isInitialised) {
		 		this.title.isInitialised = false;
				int width = this.screenWidth - (this.marginLeft + this.marginRight);
				this.titleHeight = this.title.getItemHeight( width, width );
		 	}
		 //#endif
		//#if tmp.usingTitle && polish.css.title-style				
			}
		//#endif
		//#if tmp.usingTitle && polish.css.title-position
			Integer titlePositionInt = style.getIntProperty("title-position");
			if (titlePositionInt == null && this.title != null && this.title.style != null) {
				titlePositionInt = this.title.style.getIntProperty("title-position");
			}
			if (titlePositionInt != null) {
				this.paintTitleAtTop = (titlePositionInt.intValue() == POSITION_TOP);
			}
			
		//#endif
		//#if tmp.useScrollBar && polish.css.scrollbar-style
			Style scrollbarStyle = (Style) style.getObjectProperty("scrollbar-style");
			if (scrollbarStyle != null) {
				this.scrollBar.setStyle( scrollbarStyle );
			}
		//#endif
		//#if tmp.useScrollBar && polish.css.scrollbar-position
			Integer scrollBarPositionInt = style.getIntProperty( "scrollbar-position" );
			if (scrollBarPositionInt == null && this.scrollBar.style != null) {
				scrollBarPositionInt = this.scrollBar.style.getIntProperty( "scrollbar-position" );
			}
			if (scrollBarPositionInt != null) {
				this.paintScrollBarOnRightSide = (scrollBarPositionInt.intValue() != POSITION_LEFT);
			}
		//#endif
			

		//#ifdef polish.css.foreground-image
			String foregroundImageUrl = this.style.getProperty("foreground-image");
			if (foregroundImageUrl == null) {
				this.foregroundImage = null;
			} else {
				try {
					this.foregroundImage = StyleSheet.getImage(foregroundImageUrl, null,true);
					//#ifdef polish.css.foreground-x
						Integer xInteger = this.style.getIntProperty("foreground-x");
						if (xInteger != null) {
							this.foregroundX = xInteger.intValue();
						}
					//#endif
					//#ifdef polish.css.foreground-y
						Integer yInteger = this.style.getIntProperty("foreground-y");
						if (yInteger != null) {
							this.foregroundY = yInteger.intValue();
						}
					//#endif
				} catch (IOException e) {
					//#debug error
					System.out.println("Unable to load foreground-image [" + foregroundImageUrl + "]: " + e);
				}
			}
		//#endif
		//#if polish.css.clip-screen-info
			Boolean clipScreenInfoBool = style.getBooleanProperty( "clip-screen-info" );
			if (clipScreenInfoBool != null) {
				this.clipScreenInfo = clipScreenInfoBool.booleanValue();
			}
		//#endif	
		//#if polish.css.menubar-style  && tmp.useExternalMenuBar
			Style menuBarStyle = (Style) style.getObjectProperty("menubar-style");
			if (menuBarStyle != null) {
				this.menuBar.setStyle( menuBarStyle );
			}
		//#endif

		//#ifndef polish.skipTicker
			//#if polish.css.ticker-position
				Integer tickerPositionInt = style.getIntProperty("ticker-position");
				if (tickerPositionInt == null && this.ticker != null && this.ticker.style != null) {
					tickerPositionInt = this.ticker.style.getIntProperty("ticker-position");
				}
				if (tickerPositionInt != null) {
					this.paintTickerAtTop = (tickerPositionInt.intValue() == POSITION_TOP);
				}
			//#endif
		//#endif
		//#if polish.css.repaint-previous-screen
			Boolean repaintPreviousScreenBool = style.getBooleanProperty("repaint-previous-screen");
			if (repaintPreviousScreenBool != null) {
				this.repaintPreviousScreen = repaintPreviousScreenBool.booleanValue();
			}
		//#endif
		//#if polish.css.separate-menubar
			Boolean separateMenubarBool = style.getBooleanProperty("separate-menubar");
			if (separateMenubarBool != null) {
				this.separateMenubar = separateMenubarBool.booleanValue();
			}
		//#endif
		//#if tmp.menuFullScreen
			//#if polish.css.background-bottom
				Integer backgroundBottomInt = style.getIntProperty("background-bottom");
				if (backgroundBottomInt != null) {
					this.excludeMenuBarForBackground = backgroundBottomInt.intValue() == 1; 
				}
			//#endif
		//#endif
		//#ifdef tmp.usingTitle
			//#if polish.css.background-top	
				Integer backgroundTopInt = style.getIntProperty("background-top");
				if (backgroundTopInt != null) {
					this.excludeTitleForBackground = backgroundTopInt.intValue() == 1; 
				}
			//#endif
		//#endif
	}
	
	/**
	 * Animates this Screen.
	 * All embedded items are also animated.
	 * 
	 * @return true when at least one animated item needs a redraw/repaint.
	 */
	public boolean animate() {
		if (!this.isInitialised) {
			return false;
		}
			synchronized (this.paintLock) {
			try {
				boolean animated = false;
				if (this.background != null) {
					animated = this.background.animate();
				}
				//#ifdef tmp.menuFullScreen
					//#ifdef tmp.useExternalMenuBar
						animated = animated | this.menuBar.animate();
					//#else
						if (this.menuOpened) {
							animated = animated | this.menuContainer.animate();
						} else
					//#endif
				//#endif
				if (this.container != null) {
					animated = animated | this.container.animate();
				}
				if (this.gauge != null) {
					animated = animated | this.gauge.animate();
				}
				//#ifdef tmp.usingTitle
					if (this.title != null) {
						animated = animated | this.title.animate();
					}
				//#endif
				//#ifndef polish.skipTicker
					if (this.ticker != null) {
						animated = animated | this.ticker.animate();
					}