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Ignore CSS for some Widgets [message #889729]

Tue, 19 June 2012 14:18

Quang Tran

Messages: 25
Registered: June 2012

Junior Member

Hi,
we have in our Application some Labels which shows depending on a state the text in green or red (background)
This doesn't harmonise with the CSS Binding in E4, because we set the background before the CSS Databinding is running.
So the text, at first creation, no matter in what state we are, is the default color defined in CSS.
I did a workaround by adding a paint listener to the label.

label.addListener( SWT.Paint, new Listener() {

            @Override
            public void handleEvent(final Event event) {
                if( isActive ) {
                    label.setBackground( green );
                } else {
                    label.setBackground( red );
                }
            }
        } );

But I don't like this solution, is there any other way?

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Re: Ignore CSS for some Widgets [message #889803 is a reply to message #889729]

Tue, 19 June 2012 17:20

Brian de Alwis

Messages: 242
Registered: July 2009

Senior Member

Quang Tran wrote on Tue, 19 June 2012 10:18

This doesn't harmonise with the CSS Binding in E4, because we set the background before the CSS Databinding is running.

Could you expand on this, please? Why isn't the CSS theme running?

Quote:

But I don't like this solution, is there any other way?

I can think of a couple of approaches:

1. Ensure the CSS engine is started before you create your GUI. The CSS is applied quickly -- I've never seen any flash from it being applied after the UI has been rendered.

2. Explicitly query the CSS Engine to calculate the CSS property values that are to be applied to your table (see WidgetElement.getCSSEngine() and CSSEngine.getViewCSS()) and use those values to populate the foreground and background.

Brian.

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Re: Ignore CSS for some Widgets [message #889906 is a reply to message #889729]

Wed, 20 June 2012 08:14

Quang Tran

Messages: 25
Registered: June 2012

Junior Member

Here is another example why we need a function to ignore css for some widgets:
If you have a dark css theme and a part of your css file is defined as follows:

.MPartStack.active ExpandBar {
	background-color: #101010;
	color: black;
}

.MPartStack ExpandBar {
	background-color: #101010;
	color: black;
}

Label {
	font: Verdana 8px;
	color: white;
}

Composite Label {
	color: white;
}

And you have a viewpart, which shows the text color of the labels, depending on a state, in red or green. This does not work if your view loose the focus and gain it again later, because the label colors will be white again due to the CSS binding.

Quang

[Updated on: Wed, 20 June 2012 08:15]

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Re: Ignore CSS for some Widgets [message #889941 is a reply to message #889906]

Wed, 20 June 2012 10:25

Thomas Schindl

Messages: 6651
Registered: July 2009

Senior Member

Am 20.06.12 10:14, schrieb Quang Tran:
> Here is another example why we need a function to ignore css for some
> widgets:
> If you have a dark css theme and a part of your css file is defined as
> follows:
>
>
> MPartStack.active ExpandBar {
> background-color: #101010;
> color: black;
> }
>
> MPartStack ExpandBar {
> background-color: #101010;
> color: black;
> }
>
> Label {
> font: Verdana 8px;
> color: white;
> }
>
> Composite Label {
> color: white;
> }
>
> And you have a viewpart, which shows the text color of the labels,
> depending on a state, in red or green. This does not work if your view
> loose the focus and gain it again later, because the labels will be in
> white again due to the CSS binding.
>
> Quang

Why are you need creating a CSS-Rule for highlighted labels?

Current-Code:
-------------
Label l = ...
l.setForegroundColor(....)

CSS/Java-Code:
---------
Css:
Label.highlight {
color: red;
}

Java:
IStylingEngine se = ...
Label l = ...
se.setClassname("highlighted");

Tom

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Re: Ignore CSS for some Widgets [message #891505 is a reply to message #889729]

Mon, 25 June 2012 06:14

Quang Tran

Messages: 25
Registered: June 2012

Junior Member

Hi Tom,

Quote:

Why are you need creating a CSS-Rule for highlighted labels?

What do you mean by that?

Current-Code:
-------------
Label l = ...
l.setForegroundColor(....)


CSS/Java-Code:
---------
Css:
Label.highlight {
color: red;
}

Java:
IStylingEngine se = ...
Label l = ...
se.setClassname("highlighted");

this seems like a good solution for us, thanks!

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