I need help achieving a similar result to the following:
// design.css
@define borderThickness '2px';
.format {
width: borderThickness + 2;
height: borderThickness + 2;
}
The desired output is for the width and height properties to equal 4px.
On occasions, I utilize the following approach:
@eval BORDER_SIZE_PLUS_2 2+2+"px"; /* GWT will compute this during compilation! */
Interestingly, it only seems to function properly if there are no spaces between the + operator and the operands. Furthermore, when using @eval, you cannot incorporate constants that were previously defined with @def. Nevertheless, you can make use of constants declared as static fields in one of your Java classes:
@eval BORDER_SIZE_PLUS_2 com.example.MyCssConstants.BORDER_SIZE+2+"px";
Alternatively, you have the option of letting the computation be handled entirely by Java:
@eval WIDTH com.example.MyCssCalculations.width(); /* static method,
no arguments! */
@eval HEIGHT com.example.MyCssCalculations.height();
.style {
width: WIDTH;
height: HEIGHT;
}
However, my preference aligns closely with your idea:
@def BORDER_SIZE 2;
.style {
width: value(BORDER_SIZE + 2, 'px'); /* unfortunately not feasible */
height: value(BORDER_SIZE + 3, 'px');
}
I don't believe this is achievable in GWT 2.0. Perhaps you may discover a more optimal solution - refer to the Developer Guide page related to this subject.
There is limited support for this feature using the CSS calc() function in Mozilla browsers.
This code example was borrowed (with credit!) from a post on Ajaxian
/*
* Positioning two divs side by side with a 1em margin
*/
#a {
width:75%;
margin-right: 1em;
}
#b {
width: -moz-calc(25% - 1em);
}
Although not fully supported across all browsers, progress is being made towards better compatibility in newer versions of Firefox.
Consider incorporating a parameter into your provider method to calculate the value:
@eval baseFontSize com.example.MyCssProvider.calculateBaseFontSize(0)+"px";
@eval baseFontSize_plus_1 com.example.MyCssProvider.calculateBaseFontSize(1)+"px";
The com.example.MyCssProvider implementation may resemble this:
public static int calculateBaseFontSize(int sizeToAdd) {
if (true) {
return 12 + sizeToAdd;
}
return baseFontSize;
}
I really like the concept, but unfortunately it's not currently feasible. Even with CSS 3, there are no plans for such a feature.
If you're determined to create something similar, one option is to utilize PHP and configure your web server to process .css files as PHP.
For example:
<?
$paddingSize = 4;
?>
.style {
width: <? paddingSize + 3 ?>px;
height: <? paddingSize + 3 ?>px;
}
However, since this method isn't considered standard practice, I would advise against implementing it.
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