I can't get my mind around the fact that *value* function and *eval* are
always runtime substitutions for *ImageResource*, when it's clearly said in
http://www.gwtproject.org/doc/latest/DevGuideClientBundle.html for *@eval*
-
If the user-defined function can be statically evaluated by the
compiler, then the implementation of the specific CssResource should
collapse to just a string literal.
One of the major optimizations provided by ClientBundle is an image bundle
generation, and it's done at compile time. Also any ClientBundle is a
subject of GWT.create(...) call. My point is that there's no runtime
information required here. And yet for
@def MY_CONSTANT 5px;
@def TOP_PANEL_BUTTON_AREA_MARGIN_TOP eval(
"net.vit.gwt.dev.ui.popuplogger.client.PopupLoggerImpl.evalTopPanelButtonAreaMarginTop()"
);
I get only
Java expression : net.vit.gwt.dev.ui.popuplogger.client.PopupLoggerImpl.
evalTopPanelButtonAreaMarginTop()
I'm not sure at which point the call to *evalTopPanelButtonAreaMarginTop()* is
done and why so late. But it precludes from mixing *value* or *eval* in GSS
formulas. Therefore I have to either rely on CSS3 *calc()* funcion, or do
everything in static methods like *evalTopPanelButtonAreaMarginTop()*.
-----------------------------------------------------------------------------
So the task is still the same: *derive an offset, based on the information
about image(s) size and other ready-to-use constants when
CssResource.ensureInjected() is called. *
Let's say I need to declare a class *.inner* in *my.gss*, for which
*margin-top:* property would be equal to *(<height of image A> - <**height **of
image B>)/2 + constant*. I declare a static method:
*lib.MyWidgetImpl.java:*
public static String evalMarginTop() {
int val = (*resource*.imageA().getHeight() - *resource*.imageB().getHeight
()) / 2 + *css*.myConstant();
return val + "px";
}
Now where do I get *resource* and *css *from? Well, I believe I'm forced to
statically inject them. I didn't manage to find a better solution for my
GIN controlled client lib. These are the miniumum requirements:
*lib.MyWidgetImpl.java:*
@Inject static MyWidgetResources resources;
@Inject static MyWidgetCss css;
*lib/myWidget.gss*:
@def MY_CONSTANT 5px;
@def MARGIN_TOP eval("lib.MyWidgetImpl.evalMarginTop()");
.inner {
margin-top: MARGIN_TOP;
}
*lib.MyWidgetCss.java:*
@ImportedWithPrefix("myWidget")
public interface MyWidgetCss extends CssResource, SharedCss {
String DEFAULT_PATH = "lib/my.gss";
...
int myConstant();
}
*lib.MyWidgetResource.java:*
public interface MyWidgetResources extends ClientBundle {
@Source("lib/imageA.png")
ImageResource imageA();
@Source("lib/imageB.png")
ImageResource imageB();
@Source({MyWidgetCss.DEFAULT_PATH, SharedCss.DEFAULT_PATH});
MyWidgetCss myWidgetCss();
}
*Application:*
*blah.AppResource.java:*
public interface AppResource extends ClientBundle, MyWidgetResource,...other
bundles {
...
}
*blah.AppModule.java:*
@Override
protected void configure() {
bind(MyWidgetResource.class).to(AppResource.class).in(Singleton.class);
requestStaticInjection(MyWidgetImpl.class);
}
@Provides
@Singleton
public MyWidgetCss getMyWidgetCss(MyWidgetResource resources) {
return resources.MyWidgetCss();
}
I don't want to statically inject resources and request static injection
for each and every ui class in my application, for which I have a GSS file
with runtime evaluation. I want to inject resources in constructor. Why
does it have to be so ugly in order to make my GIN controlled client lib
work?
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