Flex 荧光笔

最新推荐文章于 2025-06-19 20:20:47 发布

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最新推荐文章于 2025-06-19 20:20:47 发布

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本文介绍了一个使用Adobe Flex开发的简易绘画应用程序。该程序允许用户通过鼠标绘制线条，并提供了颜色选择、线宽调整及清除画布的功能。文章详细展示了如何利用Flex的事件监听和图形绘制API实现这些交互。

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<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" 
			   xmlns:s="library://ns.adobe.com/flex/spark" 
			   xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600"
			   creationComplete="onCreationCompleteHandler(event)">
	<fx:Declarations>
		<!-- Place non-visual elements (e.g., services, value objects) here -->
	</fx:Declarations>
	<fx:Script>
		<![CDATA[
			import mx.binding.utils.BindingUtils;
			import mx.events.FlexEvent;
			
			
			private var mX:Number;
			private var mY:Number;
			private var isDown:Boolean = false;
			[Bindable] public var _lineSize:int =3;
			[Bindable] public var _lineColor:uint = 0Xff0000;
			
			private function onMouse_downHandler(e:MouseEvent):void{
				isDown = true;
				mX = myPanel.mouseX;
				mY = myPanel.mouseY;
			}
			private function onMouse_upHandler(e:MouseEvent):void{
				isDown = false;
			}
			
			private function onMouse_moveHandler(e:MouseEvent):void{
				if(isDown){
					var x:Number = myPanel.mouseX;
					var y:Number = myPanel.mouseY;
					myPanel.graphics.lineStyle(_lineSize,_lineColor,1);
					myPanel.graphics.moveTo(mX,mY);
					myPanel.graphics.lineTo(x,y);
					mX = x;
					mY = y;	
				}
			}
			
			protected function onCreationCompleteHandler(event:FlexEvent):void
			{
				myPanel.addEventListener(MouseEvent.MOUSE_DOWN,onMouse_downHandler);
				myPanel.addEventListener(MouseEvent.MOUSE_MOVE,onMouse_moveHandler);
				myPanel.addEventListener(MouseEvent.MOUSE_UP,onMouse_upHandler);
				BindingUtils.bindProperty(this,"_lineSize",hs,"value");
				BindingUtils.bindProperty(this,"_lineColor",cp,"selectedColor");				
			}
			
		]]>
	</fx:Script>
	<mx:Panel width="100%" height="100%">
		<s:Group id="myPanel" x="113.5" y="83" width="100%" height="90%"
				   buttonMode="true">
			
		</s:Group>
		<s:Button label="清空" click="myPanel.graphics.clear();"/>
		<mx:HSlider id="hs" value="{_lineSize}"/>
		<mx:ColorPicker id="cp" selectedColor="{_lineColor}"/>
	</mx:Panel>
</s:Application>