Flex3+ArcGIS+API改变鼠标停留在导航条时显示的提示信息

最新推荐文章于 2020-12-07 15:26:32 发布

原创最新推荐文章于 2020-12-07 15:26:32 发布 · 1k 阅读

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CC 4.0 BY-SA版权

文章标签：

#flex #api #import #function #string #class

本文介绍如何通过自定义类MyNavigation和MyNavigationSlider来修改地图导航条的提示信息，包括缩放按钮提示及滑块级别提示。

以下代码来自网络，主要通过两个类文件实现改变鼠标停留在导航条时显示的提示信息。在工程中添加这两个类文件后，还需设置Map的navigationClass指向MyNavigation
第一个类：MyNavigation
package controls
{
    import com.esri.ags.controls.Navigation;
    import mx.core.UIComponent;
    import mx.controls.Spacer;

    public class MyNavigation extends Navigation
    {
        public function MyNavigation()
        {
            super();
            // use MyNavigationSlider
            navigationSliderClass = MyNavigationSlider;
        }

        override protected function addZoomInZoomOutComponents(
            zoomInButton:UIComponent,
            zoomOutButton:UIComponent
        ):void
        {
            zoomOutButton.toolTip = "缩小";
            zoomInButton.toolTip = "放大";
            addChild( new Spacer());
            addChild( zoomInButton );
            addChild( zoomOutButton );
            addChild( new Spacer());
        }

    }
}
第二个类：MyNavigationSlider
package controls
{
    import com.esri.ags.Map;
    import com.esri.ags.controls.navigationClasses.NavigationSlider;
    import com.esri.ags.layers.LOD;

    public class MyNavigationSlider extends NavigationSlider
    {
        public function MyNavigationSlider()
        {
        }

         /**
         * Formats the data tip text based on the level of the map.
         *
         * @param value the map level.
         * @return the data tip text.
         */
        override protected function formatDataTip(value:Number):String
        {
            var result:String;

            var lod:LOD = map.lods[value]; // get the LOD for the given level
            var scale:Number = lod.scale;

            if (scale < 10000)
            {
                result = "Neighborhood";
            }
            else if (scale < 100000)
            {
                result = "City"
            }
            else if (scale < 1400000)
            {
                result = "County"
            }
            else if (scale < 5000000)
            {
                result = "State/Province"
            }
            else if (scale < 20000000)
            {
                result = "Country"
            }
            else if (scale < 50000000)
            {
                result = "Region"
            }
            else if (scale < 100000000)
            {
                result = "Continent"
            }
            else
            {
                result = "World"
            }

            return result;

        }
    }
}