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Posted to users@flex.apache.org by bilbosax <wa...@comcast.net> on 2017/03/06 20:06:46 UTC
Wrong CSS DPI Buckets Being Chosen
I am playing with CSS to try and get a hang of setting my font sizes based on
a device's DPI. I did not set the applicationDPI at the application level,
assuming that if it is not set, it will set itself to an appropriate DPI
bucket. Then, I trace the applicationDPI and the Capabilities.screenDPI.
When I debug it on my iPad, it traces that it's Capabilities.screenDPI is
264, which according to the link below, should map the device to a DPI
bucket of 240. But it traces the applicationDPI as 320, and the CSS rule
that it is selecting is the 320 rule. How do I get the application to set
the applicationDPI to 240 when the Capabilities.screenDPI is 264, and force
it to use the 240 CSS rule?
https://flex.apache.org/asdoc/mx/core/RuntimeDPIProvider.html#includeExamplesSummary
<https://flex.apache.org/asdoc/mx/core/RuntimeDPIProvider.html#includeExamplesSummary>
<?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"
applicationComplete="appCreationCompleteHandler(event)"
creationPolicy="all">
<fx:Style>
@namespace s "library://ns.adobe.com/flex/spark";
@namespace mx "library://ns.adobe.com/flex/mx";
@media (application-dpi: 160) {
s|Label {
fontSize: 40;
}
}
@media (application-dpi: 240) {
s|Label {
fontSize: 100;
}
}
@media (application-dpi: 320) {
s|Label {
fontSize: 15;
}
}
</fx:Style>
<fx:Script>
</fx:Script>
<s:Label id="testText" horizontalCenter="0" verticalCenter="-300"/>
</s:Application>
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Re: Wrong CSS DPI Buckets Being Chosen
Posted by bilbosax <wa...@comcast.net>.
Thanks Om, that was a good find and explains a lot as I was beginning to
think the system was broken :) This will help me a TON, and gives me
confidence that I am doing things right!!
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Re: Wrong CSS DPI Buckets Being Chosen
Posted by OmPrakash Muppirala <bi...@gmail.com>.
Is it a retina iPad? There is a list of exceptions listed in this link
[1], which says:
- All retina iPads receive 320 DPI
If you see the code in [2], you can see that iPad retina's are simply
assigned a DPI of 320 regardless of what Capabilities.screenDPI reports.
The good news is that this is configurable, you can simply supply a
runtimeDPIProvider class to Application and implement your own logic to
calculate the DPI as per your application needs. An example can be seen
here: [1] and [3]
Hope this helps.
Thanks,
Om
[1] https://flex.apache.org/asdoc/mx/core/RuntimeDPIProvider.html#runtimeDPI
[2]
https://github.com/apache/flex-sdk/blob/8f3dd5bb05549b29f9d608e6abc914409a1a4ae2/frameworks/projects/framework/src/mx/core/RuntimeDPIProvider.as#L143
[3]
https://github.com/apache/flex-sdk/blob/8f3dd5bb05549b29f9d608e6abc914409a1a4ae2/frameworks/projects/framework/asdoc/en_US/mx/core/examples/RuntimeDPIProviderExample.as
On Mon, Mar 6, 2017 at 1:09 PM, bilbosax <wa...@comcast.net> wrote:
> In other words, based on a Capabilities.screenDPI of 262, why isn't the
> applicationDPI or runtimeDPI being mapped to 240 as one would expect, and
> therefore selecting the incorrect CSS rules?
>
>
>
> --
> View this message in context: http://apache-flex-users.
> 2333346.n4.nabble.com/Wrong-CSS-DPI-Buckets-Being-Chosen-
> tp14779p14780.html
> Sent from the Apache Flex Users mailing list archive at Nabble.com.
>
Re: Wrong CSS DPI Buckets Being Chosen
Posted by bilbosax <wa...@comcast.net>.
In other words, based on a Capabilities.screenDPI of 262, why isn't the
applicationDPI or runtimeDPI being mapped to 240 as one would expect, and
therefore selecting the incorrect CSS rules?
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