【Flex Viewer】 开发教程(1)Flex Viewer配置文件
Flex Viewer的设计原则是SIMPLICITY(简单)。因为简单原则,Flex Viewer易于部署、配置和扩展。为了达到“简单”这个目的,Flex Viewer在设计和实现上未引入第三方框架。但是从其框架结构上,我们能捕捉到一些Flex框架中最佳实践的影子,比如事件机制就与PureMVC中的Notification机制类似。
其实,Flex Viewer本身就可以被认为是一个框架。在这个框架基础上,可以通过扩展快速实现业务系统原型。本文档将详细介绍如何在“简单”原则下实现自定义Widget,以及Widget如何与其它模块交互。
说明
本文档使用的代码位于widgets.FlexViewerInAction目录下。
Flex Viewer通过配置文件配置系统数据和功能,配置文件内容如下:
<?xml version="1.0" ?>
<configuration>
<title>ArcGIS Viewer for Flex</title>①
<subtitle>a configurable web mapping application</subtitle>②
<logo>assets/images/logo.png</logo>③
<style>④
<colors>0xFFFFFF,0x333333,0x101010,0x000000,0xFFD700</colors>
<alpha>0.8</alpha>
</style>
<bing key="Al0VE_jsmagxk4LFghXGlK5JSHfC0tk-eHRubZv_eMYm6wzgQaStYks8g-wWcgk3"/>
<!-- UI elements -->
<widget left="10" top="50" config="widgets/Navigation/NavigationWidget.xml"
url="widgets/Navigation/NavigationWidget.swf"/>⑤
<widget right="-2" bottom="-2" config="widgets/OverviewMap/OverviewMapWidget.xml"
url="widgets/OverviewMap/OverviewMapWidget.swf"/>⑥
<widget right="20" top="55" config="widgets/MapSwitcher/MapSwitcherWidget.xml"
url="widgets/MapSwitcher/MapSwitcherWidget.swf"/>⑦
<widget left="0" top="0" config="widgets/HeaderController/HeaderControllerWidget.xml"
url="widgets/HeaderController/HeaderControllerWidget.swf"/>⑧
<map initialextent="-14083000 3139000 -10879000 5458000" top="40" wraparound180="true">⑨
<basemaps>
<layer label="Streets" type="tiled" visible="true" alpha="1" url="http://server.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer"/>
<layer label="Aerial" type="tiled" visible="false" alpha="1" url="http://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer"/>
<layer label="Topo" type="tiled" visible="false" alpha="1" url="http://server.arcgisonline.com/ArcGIS/rest/services/World_Topo_Map/MapServer"/>
</basemaps>
<operationallayers>
<layer label="Boundaries and Places" type="tiled" visible="false" url="http://server.arcgisonline.com/ArcGIS/rest/services/Reference/World_Boundaries_and_Places_Alternate/MapServer"/>
<layer label="Fires" type="feature" visible="false" alpha="1" info="widgets/InfoTemplates/SimpleInfoWinWidget.swf"
infoconfig="widgets/InfoTemplates/IWT_Fires.xml" url="http://sampleserver3.arcgisonline.com/ArcGIS/rest/services/Fire/Sheep/FeatureServer/0"/>
</operationallayers>
</map>
<!-- widgets organized into widget containers that manage close/open etc -->
<!-- supported layout property options: horizontal(default)|float|vertical|fix-->
<widgetcontainer layout="horizontal">⑩
<widget label="Bookmarks" left="430" top="90" icon="assets/images/i_bookmark.png"
config="widgets/Bookmark/BookmarkWidget.xml"
url="widgets/Bookmark/BookmarkWidget.swf"/>
<widget label="Find an address" left="100" top="90" preload="open" icon="assets/images/i_target.png"
config="widgets/Locate/LocateWidget_Bing.xml"
url="widgets/Locate/LocateWidget.swf"/>
<widget label="Louisville Police" left="590" top="280" icon="assets/images/i_police.png" config="widgets/Query/QueryWidget_Louisville_PoliceStations.xml"
url="widgets/Query/QueryWidget.swf"/>
<widget label="Search" left="80" top="280" icon="assets/images/i_search.png"
config="widgets/Search/SearchWidget_Louisville.xml"
url="widgets/Search/SearchWidget.swf"/>
<widget label="Earthquakes (GeoRSS)" left="410" top="280" icon="assets/images/i_rss.png"
config="widgets/GeoRSS/GeoRSSWidget.xml"
url="widgets/GeoRSS/GeoRSSWidget.swf"/>
<widget label="Draw and Measure" left="60" top="400" icon="assets/images/i_draw2.png"
config="widgets/Draw/DrawWidget.xml"
url="widgets/Draw/DrawWidget.swf"/>
<widget label="Print" left="390" top="400" icon="assets/images/i_print.png"
config="widgets/Print/PrintWidget.xml"
url="widgets/Print/PrintWidget.swf"/>
</widgetcontainer>
</configuration>
① title:Flex Viewer自带Banner实现的标题;
② subtitle:Flex Viewer自带Banner实现的副标题;
③ logo:Flex Viewer自带Banner实现的Logo图标;
④ style:用来设置全局的组件样式,具体详见UIManager代码;
⑤⑥⑦⑧ UI Elements:指Control Widget,比如HeaderControllerWidget、NavigationWidget等这些提供系统级别功能的Widget;
⑨ map:Flex Viewer用来设置地图属性,包括底图、业务图层;
⑩ widgetcontainer:Business Widget的容器,用来管理Business Widget。Business Widget指提供业务功能的Widget。
上述配置文件并未使用到所有可用的属性,比如在style中设置font属性,map中设置fullextent等,此处不一一列举,详见ConfigManager代码。
需要说明的是,基于Flex Viewer开发业务系统,一般通过实现自定义的Business Widget来实现具体的业务功能,通过修改或者自定义Control Widget实现符合需求的系统级别功能组件。所以,配置文件中的前三项并不是必须的,通常我们的业务系统需要更具特色的Banner实现。Flex Viewer各部分与配置文件的对应关系见下图:
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