Flex - Image Control

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Introduction

The Image control lets you import JPEG, PNG, and GIF files at runtime. You can also embed any of these files at compile time by using @Embed(source='filename').

Embedded images load immediately, because they are compiled with of the Flex SWF file. However, they add to the size of the application and slow down the application initialization process. Embedded images also require you to recompile your applications whenever your image files change.

You can load an image from the local file system in which the SWF file runs, or you can access a remote image, typically though an HTTP request over a network. These images are independent of your Flex application, so you can change them without causing a recompile operation as long as the names of the modified images remain the same. The referenced images add no additional overhead to an application's initial loading time.

Class Declaration

Following is the declaration for spark.components.Image class −

public class Image 
   extends SkinnableComponent

Public Properties

Public Methods

Events

Methods Inherited

This class inherits methods from the following classes −

• spark.components.supportClasses.SkinnableComponent
• mx.core.UIComponent
• mx.core.FlexSprite
• flash.display.Sprite
• flash.display.DisplayObjectContainer
• flash.display.InteractiveObject
• flash.display.DisplayObject
• flash.events.EventDispatcher
• Object

Flex Image Control Example

Let us follow the following steps to check usage of Image control in a Flex application by creating a test application −

Following is the content of the modified mxml file src/com.tutorialspoint/HelloWorld.mxml.

<?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"
   width = "100%" height = "100%" minWidth = "500" minHeight = "500"
   applicationComplete = "init(event)" >	
   
   <fx:Style source = "/com/tutorialspoint/client/Style.css" />
   <fx:Script>
      <![CDATA[
         import mx.controls.Alert;
         import mx.events.FlexEvent;

         [Bindable]
         [Embed(source = "assets/flex-mini.jpg")] 
         private var flexImage:Class; 
         protected function init(event:FlexEvent):void {
            dynamicImage.source = 
               "http://www.tutorialspoint.com/images/flex-mini.png";
         }

      ]]>
   </fx:Script>
   
   <s:BorderContainer width = "550" height = "600" id = "mainContainer" 
      styleName = "container">
      <s:VGroup width = "100%" height = "100%" gap = "50" horizontalAlign = "center"
         verticalAlign = "middle">
         <s:Label id = "lblHeader" text = "Basic Controls Demonstration" 
            fontSize = "40" color = "0x777777" styleName = "heading" />
         
         <s:Panel title = "Using Embeded Image" width = "420" height = "200" >
            <s:Image source = "{flexImage}" />			
         </s:Panel>			
         <s:Panel title = "Using Image from URL" width = "420" height = "200" >
            <s:Image id = "dynamicImage" />
         </s:Panel>		
      </s:VGroup>	 
   </s:BorderContainer>	
</s:Application>

Once you are ready with all the changes done, let us compile and run the application in normal mode as we did in Flex - Create Application chapter. If everything is fine with your application, it will produce the following result: [ Try it online ]