[Xswt-developer] stylesheets

[<ha...@id...>]

Hi,

After implementing the tree builder, I've been working on the stylesheet
mechanism, based on the design suggestions at
http://www.coconut-palm-software.com/the_visual_editor/?page_id=3D61. =
The
current design is as follows:

When the import/stylesheet tag is encountered, another instance of XSWT =
is
used to load that stylesheet. Parsing a stylesheet differs somewhat from
parsing an ordinary file, as it expects to find all the styles at the =
top
level, and each must have an id. No objects are created, but the id map =
is
used to "remember" the styles. What is important is that that XSWT =
instance
keeps track of its own imports (and other state).

When a style is referenced, the corresponding style tag/element/node is
retrieved and parsed by the XSWT object that loaded it, but in the =
context
of the referencing object.

I think the basic design works, but haven't gone through all the =
details.
However, I've written the first test that works(!):

public class StyleTest extends XSWTTestCase {

	public void testStyle() {
		Label label =3D (Label)getChild(0, Label.class);
		Color col =3D label.getBackground();
		assertEquals(255, col.getRed());
		assertEquals(0, col.getGreen());
		assertEquals(0, col.getBlue());
		assertTrue((label.getStyle() & SWT.BORDER) > 0);
	}
=09
	public static void main(String[] args) {
		doRun(StyleTest.class);
	}
}

StyleTest.xswt
<xswt xmlns:x=3D"http://sweet_swt.sf.net/xswt">
	<import xmlns=3D"http://sweet_swt.sf.net/xswt">
		<package name=3D"java.lang"/>
		<package name=3D"org.eclipse.swt.widgets"/>
		<package name=3D"com.swtworkbench.community.xswt.test"/>
		<stylesheet x:id=3D"styles" relativeTo=3D"StyleTest"
path=3D"StyleTestStyles.xswt"/>
	</import>
	<x:children>
		<label x:style=3D"styles.redLabel"/>
	</x:children>
</xswt>

StyleTestStyles.xswt:
<xswt xmlns:x=3D"http://sweet_swt.sf.net/xswt">
	<import xmlns=3D"http://sweet_swt.sf.net/xswt">
		<package name=3D"java.lang"/>
		<package name=3D"org.eclipse.swt.widgets"/>
	</import>
	<label x:id=3D"redLabel"
		x:style=3D"BORDER"
		background=3D"Red"/>
</xswt>

Note how the stylesheet has its own id and how the style in that =
stylesheet
is referenced using <stylesheet-id>.<style-id>.

Hallvard Tr=E6tteberg (ha...@id..., http://www.idi.ntnu.no/~hal)
Associate Professor, IS group, Dept. of Computer and Information =
Sciences at
the Norwegian Univ. of Science and Technology