/// <summary>Flattens this element.
/// Returns a promise which fires when the image has been rendered at least once.
/// The promise contains a direct reference to the latest image.</summary>
public Promise flatten()
{
// Obtain the raster data from the render data:
RasterDisplayableProperty rdp = RenderData.RasterProperty;
// Create the resultant promise:
Promise p = new Promise();
// Check if we already have an image:
Texture img = rdp == null ? null : rdp.Output;
if (img != null)
{
// Already got one! Resolve right away:
p.resolve(img);
return(p);
}
// If we don't have an RDP then request a flatten.
// Output is null so we know it'll be getting drawn on the next update.
if (rdp == null)
{
// (no full Loonim effects on this element):
style.Computed.ChangeTagProperty("-spark-filter", "flatten");
}
Dom.EventListener listener = null;
// Wait for the imagechange event:
listener = new Dom.EventListener <Dom.Event>(delegate(Dom.Event e){
// Image changed! Remove this listener:
removeEventListener("imagechange", listener);
// Update the promise:
Texture current = flatImage;
if (current == null)
{
// Unable to flatten this (This should never happen).
p.reject(FLATTEN_FAILED);
}
else
{
p.resolve(flatImage);
}
});
// Add it:
addEventListener("imagechange", listener);
return(p);
}
public override ApplyState Apply(ComputedStyle style, Value value)
{
RenderableData rd = style.RenderData;
RasterDisplayableProperty rdp = rd.RasterProperty;
if (value == null || value.IsType(typeof(Css.Keywords.None)))
{
// Remove RDP
if (rdp != null)
{
// Destroy it:
rdp.Destroy();
// Request a layout:
rdp.RequestLayout();
// Clear:
rd.RasterProperty = null;
rdp = null;
}
}
else if (rdp == null)
{
// RDP required:
rd.RasterProperty = rdp = new RasterDisplayableProperty(rd);
// Update the filter now!
BuildFilter(value, rd, delegate(RenderableData ctx, SurfaceTexture tex){
// Hopefully tex is not null!
// If so, we can write it into ctx.RasterProperty, which is hopefully
// still available:
RasterDisplayableProperty filterRdp = ctx.RasterProperty;
if (filterRdp != null)
{
// Alright - update it with the filter (which might be null).
// The filter goes between the FlatWorldUI and the Output.
filterRdp.SetFilter(tex);
// Request a layout:
filterRdp.RequestLayout();
}
});
}
// Ok!
return(ApplyState.Ok);
}
