13 Nov 2012 6:29 AM #1
unmask when the background of a container is loaded.
sorry for my bad english.
I desing an application with Sencha touch .
Into my application , I have a container wich contains a big image as background.
I would like to mask the viewport and unmask when the background is completly loaded but I dont understand how to do that.
15 Nov 2012 6:11 AM #2
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You would need to load the image outside and then you can get a load event. Once it's loaded then you can set the background image to the image.Mitchell Simoens @SenchaMitch
Sencha Inc, Senior Software Engineer
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15 Nov 2012 3:33 PM #3
Could you clarify a little bit? Would you load using Ext.Img first, then assign as a background image after?
I am trying to do the same thing...
16 Nov 2012 11:10 PM #4
No , in fact I would like to load a picture as background of a container. The picture is big and takes some time so I would like to mask de viewport while the picture is loading and unmask it when de image is loaded.
17 Nov 2012 4:06 AM #5
Hi yes I am trying to do the same thing....I meant can Mitchell clarify a little bit.
When he says 'You would need to load the image outside and then you can get a load event. Once it's loaded then you can set the background image to the image.'
What does he mean by 'load the image outside' does he mean load it perhaps at init before anything else has loaded? I am not sure how to do this.
17 Nov 2012 8:31 AM #6
use Ext.img's load event which is fired when image is actually finished loading (check the docs)
use a listener to catch this event and only then add the image to the viewport.
Sencha guys, I think such a behavior (loading an image in the background and displaying a loading animation until it is loaded) is so common it could have been a part of the framework without waiting for extensions.
also, you can take a look at mitchel's image loader https://github.com/mitchellsimoens/Ux.ImageLoader for ideas.its from 8 months ago so not written for 2.1 but worth the look.
17 Nov 2012 9:39 AM #7
Great thanks, after reading your post I did some more searching for Ext.Img in Google and found this which explains it really well:
Next I need to work out how to adapt this, as at the moment I am loading a background image into a panel vis CSS (baseCls I think?)....currently my graphic just loads on tabpanel click but I wonder if I can load this image then assign it as a background image somehow...
I haven't had time yet to add it to my project, but if you get it working Cedric please post some hints here!
19 Nov 2012 12:58 AM #8
Thanks for your answers , it works.
19 Nov 2012 6:37 AM #9
How are you adding it after?
How are you adding the image after the load? Are you setting a panel as a background image? I'd be curious how you are doing it as at the moment I am setting a BaseCls.
Are you setting the config (.e.g BaseCls) after load to set the background?
19 Nov 2012 7:58 AM #10
Yes , I have loaded the image into a Ext.img and when the event "loaded" is fire , I use "addCls" to apply a css class on my container ( the css class put the image previously loaded as background on my container)