screen.java

j2me polish学习的经典代码

							//#if !polish.Bugs.noTranslucencyWithDrawRgb
								//#if polish.color.overlay:defined
									//#= this.previousScreenOverlayBackground = new TranslucentSimpleBackground( ${polish.color.overlay} );
								//#else
									//# this.previousScreenOverlayBackground = new TranslucentSimpleBackground( 0xAA000000 );
								//#endif
							//#endif
						//# }
					//#endif
				//# }
			//#endif
			
			// inform all root items that they belong to this screen
			// and that they will be shown soon:
			Item[] items = getRootItems();
			for (int i = 0; i < items.length; i++) {
				Item item = items[i];
				item.screen = this;
				item.showNotify();
			}
			if (this.container != null) {
				this.container.showNotify();
			}
			//#if tmp.ignoreMotorolaTitleCall
				//# this.ignoreMotorolaTitleCall = true;
			//#endif
			//#if tmp.fullScreen && polish.midp2 && !polish.blackberry
				// this is needed on Sony Ericsson for example,
				// since the fullscreen mode is not resumed automatically
				// 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();
		}
	 	//#debug
		//# 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(102);
			//# 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(103);
			//# 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( 36 );
			//# if (scrollIndicatorColorInt != null) {
				//# this.scrollIndicatorColor = scrollIndicatorColorInt.intValue();
			//# }
		//#endif
		//#if tmp.usingTitle && polish.css.title-style
			//# this.titleStyle = (Style) style.getObjectProperty(2);
			//# 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(115);
			//# if (titlePositionInt == null && this.title != null && this.title.style != null) {
				//# titlePositionInt = this.title.style.getIntProperty(115);
			//# }
			//# if (titlePositionInt != null) {
				//# this.paintTitleAtTop = (titlePositionInt.intValue() == POSITION_TOP);
			//# }
//# 			
		//#endif
		//#if tmp.useScrollBar && polish.css.scrollbar-style
			//# Style scrollbarStyle = (Style) style.getObjectProperty(126);
			//# if (scrollbarStyle != null) {
				//# this.scrollBar.setStyle( scrollbarStyle );
			//# }
		//#endif
		//#if tmp.useScrollBar && polish.css.scrollbar-position
			//# Integer scrollBarPositionInt = style.getIntProperty( 118 );
			//# if (scrollBarPositionInt == null && this.scrollBar.style != null) {
				//# scrollBarPositionInt = this.scrollBar.style.getIntProperty( 118 );
			//# }
			//# if (scrollBarPositionInt != null) {
				//# this.paintScrollBarOnRightSide = (scrollBarPositionInt.intValue() != POSITION_LEFT);
			//# }
		//#endif
			

		//#ifdef polish.css.foreground-image
			//# String foregroundImageUrl = this.style.getProperty(52);
			//# 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(53);
						//# if (xInteger != null) {
							//# this.foregroundX = xInteger.intValue();
						//# }
					//#endif
					//#ifdef polish.css.foreground-y
						//# Integer yInteger = this.style.getIntProperty(54);
						//# 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( 87 );
			//# if (clipScreenInfoBool != null) {
				//# this.clipScreenInfo = clipScreenInfoBool.booleanValue();
			//# }
		//#endif	
		//#if polish.css.menubar-style  && tmp.useExternalMenuBar
			//# Style menuBarStyle = (Style) style.getObjectProperty(117);
			//# if (menuBarStyle != null) {
				//# this.menuBar.setStyle( menuBarStyle );
			//# }
		//#endif

		//#ifndef polish.skipTicker
			//#if polish.css.ticker-position
				//# Integer tickerPositionInt = style.getIntProperty(114);
				//# if (tickerPositionInt == null && this.ticker != null && this.ticker.style != null) {
					//# tickerPositionInt = this.ticker.style.getIntProperty(114);
				//# }
				//# if (tickerPositionInt != null) {
					//# this.paintTickerAtTop = (tickerPositionInt.intValue() == POSITION_TOP);
				//# }
			//#endif
		//#endif
		//#if polish.css.repaint-previous-screen
			//# Boolean repaintPreviousScreenBool = style.getBooleanProperty(116);
			//# 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(153);
				//# if (backgroundBottomInt != null) {
					//# this.excludeMenuBarForBackground = backgroundBottomInt.intValue() == 1; 
				//# }
			//#endif
		//#endif
		//#ifdef tmp.usingTitle
			//#if polish.css.background-top	
				//# Integer backgroundTopInt = style.getIntProperty(154);
				//# if (backgroundTopInt != null) {
					//# this.excludeTitleForBackground = backgroundTopInt.intValue() == 1;