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From "Jason Moore (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLEX-34653) Overriding RuntimeDPIProvider causes incorrect application scalling
Date Thu, 04 Dec 2014 09:30:12 GMT

    [ https://issues.apache.org/jira/browse/FLEX-34653?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14234057#comment-14234057
] 

Jason Moore commented on FLEX-34653:
------------------------------------

... a little more from the docs...

{quote}
AIR-only applicationDPI	property
applicationDPI:Number

Language Version : 	ActionScript 3.0
Product Version : 	Flex 4.5
Runtime Versions : 	AIR 2.5

The DPI of the application. By default, this is the DPI of the device that the application
is currently running on. When set in MXML, Flex will scale the Application to match its DPI
to the runtimeDPI. 
{quote}

> Overriding RuntimeDPIProvider causes incorrect application scalling
> -------------------------------------------------------------------
>
>                 Key: FLEX-34653
>                 URL: https://issues.apache.org/jira/browse/FLEX-34653
>             Project: Apache Flex
>          Issue Type: Bug
>          Components: Layout - General, Skinning
>    Affects Versions: Apache Flex 4.13.0
>         Environment: Windows ( Possible Mac - Not checked ).
>            Reporter: Jason Moore
>              Labels: DPI, Scaling, automatic
>
> The issue occurs when using automatic scaling and setting the application DPI and overriding
the runtimeDPIProvider to set the runtimeDPI where it is incorrectly returned from the OS
( On desktop devices for instance ).
> If the two values match ie 1:1 scaling, there is no issue. But if they differ then the
application content is scalled correctly , but the stage size is also scaled, incorrect. This
leads to the application being clipped when scaling up and excess space when scaling down..
See code excepts to recreate...
> {code:title=ScaleIssue.mxml|borderStyle=solid}
> <?xml version="1.0" encoding="utf-8"?>
> <s:WindowedApplication xmlns:fx="http://ns.adobe.com/mxml/2009" 
> 					   xmlns:s="library://ns.adobe.com/flex/spark" 
> 					   xmlns:mx="library://ns.adobe.com/flex/mx"
> 					   applicationDPI="160"
> 					   runtimeDPIProvider="myRuntimeDPIProvider">
> 	
> 		<s:Label id="LeftMarker" left="0" verticalCenter="0" text="&lt;--- LEFT" fontSize="24"/>
> 		<s:Label id="MiddleMarker" horizontalCenter="0" verticalCenter="0" text="&gt;
&gt; &gt; MIDDLE &lt; &lt; &lt;" fontSize="24"/>
> 		<s:Label id="RightMarker" right="0" verticalCenter="0" text="RIGHT ---&gt;"
fontSize="24"/>
> 							 
> </s:WindowedApplication>
> {code}
> {code:title=myRuntimeDPIProvider.as|borderStyle=solid}
> package 
> {
> 	
> 	import mx.core.DPIClassification;
> 	import mx.core.RuntimeDPIProvider;
> 	
> 	public class myRuntimeDPIProvider extends RuntimeDPIProvider
> 	{
> 				
> 		/**
> 		 * Overrride getter function so we can set the dpi manually when running on desktop
device
> 		 * This would normally be a bit more sophisticated... 
> 		 * 
> 		 * @return 
> 		 * 
> 		 */		
> 		override public function get runtimeDPI():Number
> 		{			
> 			return DPIClassification.DPI_240;
> 		}
> 		
> 	}
> }
> {code}
> You should see the text labels pointing to the left and right screen edges.. but instead
the right hand label is off screen.
> Hope that makes sense.
> J :)



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