目的:
1.ArcGIS API for Flex实现Toolbar功能,包括ZoomIn、ZoomOut、Pan、PrevExtent、NextExtent、FullExtent功能。
准备工作:
1.这次地图数据就用Esri提供的http://server.arcgisonline.com/ArcGIS/rest/services/ESRI_StreetMap_World_2D/MapServer。
完成后的效果图:
开始:
1.启动Flex Builder3新建工程以及引入ArcGIS API for Flex library的开发包,这个过程前面几篇都讲过了这里就不啰嗦了。
2.新建ToolBar.mxml页面,然后在页面上添加Map控件以及设置ArcGISTiledMapServiceLayer,具体代码如下:
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<?xml version="1.0" encoding="utf-8"?>
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<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" backgroundColor="white" xmlns:esri="http://www.esri.com/2008/ags">
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<mx:Canvas width="446" height="300" borderStyle="solid" borderThickness="3" borderColor="#3691D1" horizontalCenter="0" verticalCenter="19">
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<esri:Map id="myMap" width="100%" height="100%" panArrowsVisible="true" logoVisible="false" >
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<esri:ArcGISTiledMapServiceLayer url="http://server.arcgisonline.com/ArcGIS/rest/services/ESRI_StreetMap_World_2D/MapServer"/>
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</esri:Map>
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</mx:Canvas>
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</mx:Application>
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3.接下来要实现地图浏览控制就需要添加esri:Navigation控件,这个控件提供了放大、缩小、漫游、前一视图、后一视图等功能方法,在mx:Canvas标签前面添加如下代码:
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<esri:Navigation id="navToolbar" map="{myMap}"/>
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<mx:Canvas width="446" ![](https://www.cnblogs.com/Images/dot.gif)
4.首先先来引入按钮图标图片,在src目录下新建assets目录,然后放6张图片在这个文件夹里分别用于6个功能按钮,然后添加如下代码:![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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<mx:Script>
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<![CDATA[
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//图标图片
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[Bindable]
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[Embed(source="assets/esriZoomIn.gif")]
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public var ZoomIn:Class;
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[Bindable]
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[Embed(source="assets/esriZoomOut.gif")]
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public var ZoomOut:Class;
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[Bindable]
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[Embed(source="assets/esriPan.gif")]
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public var Pan:Class;
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[Bindable]
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[Embed(source="assets/esriBack.gif")]
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public var Back:Class;
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[Bindable]
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[Embed(source="assets/esriForward.gif")]
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public var Forward:Class;
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[Bindable]
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[Embed(source="assets/esriFullExt.gif")]
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public var FullExt:Class;
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]]>
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</mx:Script>
5.接下啦在Map控件的上方位置添加一个mx:ToggleButtonBar控件,这个控件就是切换按钮组工具条,它可以添加子按钮然后各个子按钮点击时能进行显示等切换。具体代码如下:
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<mx:ToggleButtonBar id="toolbar1" creationComplete="initToolbar1()" itemClick="itemClickHandler(event)" iconField="icon" horizontalCenter="-163" verticalCenter="-151">
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<mx:dataProvider>
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<mx:Array>
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<mx:Object icon="{ZoomIn}" />
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<mx:Object icon="{ZoomOut}" />
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<mx:Object icon="{Pan}" />
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</mx:Array>
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</mx:dataProvider>
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</mx:ToggleButtonBar>
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<esri:Navigation id="navToolbar" map="{myMap}"/>
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6.上面的代码中ToggleButtonBar控件绑定了一个mx:Array数据源,这个数据源包含3条数据,icon分别对于3张图标用来按钮图标的显示,这3张图片由上的script中定义,ToggleButtonBar控件定义了iconField属性就是用来显示图标,同时定义了creationComplete事件、itemClick事件,分别实现ToggleButtonBar的初始化选择以及子按钮点击功能,具体代码如下:
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//初始化toolbar1选中项为Pan
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private function initToolbar1():void
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{
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toolbar1.selectedIndex = 2;
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}
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//ToggleButtonBar的子按钮点击事件
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private function itemClickHandler(event:ItemClickEvent):void
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{
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switch(event.index)
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{
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case 0://选择为zoomin
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{
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//激活navToolbar的ZOOM_IN
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navToolbar.activate(Navigation.ZOOM_IN);
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break;
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}
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case 1://选择为zoomout
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{
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//激活navToolbar的ZOOM_OUT
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navToolbar.activate(Navigation.ZOOM_OUT);
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break;
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}
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case 2://选择为pan
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{
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//激活navToolbar的PAN
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//navToolbar.activate(Navigation.PAN);
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navToolbar.deactivate();
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break;
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}
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}
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}
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7.接下在在页面上在添加3个按钮用来显示前一视图、后一视图、全图显示,具体代码如下:
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<mx:Button icon="{Back}" click="navToolbarExtent('Prev')" enabled="{!navToolbar.isFirstExtent}" horizontalCenter="-82" verticalCenter="-151"/>
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<mx:Button icon="{Forward}" click="navToolbarExtent('Next')" enabled="{!navToolbar.isLastExtent}" horizontalCenter="-41" verticalCenter="-151"/>
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<mx:Button icon="{FullExt}" click="navToolbarExtent('Full')" horizontalCenter="0" verticalCenter="-151"/>
8.上面代码中添加了3个button,然后设置的小图标、click事件、enabled属性,enabled属性属性是针对前一视图和后一视图功能按钮了。click事件代码如下:
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private function navToolbarExtent(type:String):void
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{
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if(type=="Prev")//前一视图
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{
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navToolbar.zoomToPrevExtent();
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}
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else if(type=="Next")//后一视图
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{
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navToolbar.zoomToNextExtent();
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}
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else if(type=="Full")//
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{
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navToolbar.zoomToFullExtent();
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}
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}
9.这样就完成了toolbar的功能,可以运行测试效果。
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