IOrderedLayout spacing and margincs should be specifiable in CSS

[Joonas Lehtinen]

See IOrderedLayout.HSPACING

[Joonas Lehtinen]

Write robust groundwork in [5056]

[Jouni Koivuviita]

Committed a helper class for this in [5058] (com.itmill.toolkit.terminal.gwt.client.CSSRule.java).

Usage:

CSSRule rule = new CSSRule(".i-orderedlayout-vspacing");
String spacing = rule.getPropertyValue("marginTop");

Cache these for faster access. Add support for changing spacing and margin sizes with stylenames.

[Joonas Lehtinen]

Added stubs for using CSS reader in [5059].

[Joonas Lehtinen]

Fixed in [5245]

Jouni: Sorry, decided not to use your parser as I was not able to figure out a strategy for robustly obtaining different CSS attributes related to spacing, margins, padding, ...

[Jouni Koivuviita]

No problem :)

The CSSRule class is somewhat limited, because it doesn't resolve any attribute inheritance or multiple classnames on one element, but I guess it is usable in some limited cases. Calculating dimensions/margins/paddings for some element in the DOM tree is not one of them.

Maybe for something like controlling the position of a splitpanel's splitter, e.g.

.i-splitpanel-control-attributes {
    width: 100%;
    height: 100%;
    margin: 20px;
    left: 230px;
    /* or */
    right: 300px;
    /* or */
    top: 120px;
    /* or */
    bottom: 80px;
}

These attributes wouldn't actually refer to any DOM element, but they would be used when drawing a specific splitpanel. That way we wouldn't need any helper stylenames like ".i-orderedlayout-margin-top", we would just get it the value of a specific margin to use like this:

CSSRule rule = CSSRule(".i-orderedlayout-mylayout-control-attributes");
String marginLeft = rule.getAttribute("margin-left");
// Then use this value when calculating layout dimensions
...

[Mauno Haukila]

Note: Could you use just Window.getComputedStyle? (Ie has it's own alternative: element.currentStyle)

"Returns computed style of the element. Computed style represents the final computed values of all CSS properties for the element. "

[Mauno Haukila]

Added small test for getComputed style method. It gets current padding, but you can get anything. Tested with ie6, ie7, fx2.0, fx3.0.. It should work with opera and webkit.