Allow for embedded effects within Frames

[peterbrittain]

The Canvas API is identical to the Screen API, so that any Effect can be embedded in a Frame. All that is needed is some adapter layer - e.g. a new widget type to allow any Effect to bre reproduced (and limited to) the Frame.

[peterbrittain]

Possibly don't event need a new widget. The Frame's Canvas is correct and Frames with no input widgets are supported, so could just maintain a set of effects to render onto the Canvas before the Frame draws its content...

[peterbrittain]

The logic for Frames (which clear on screen refresh) is not immediately compatible with general Effects (which often rely on the Screen maintaining state between refreshes). For a consistent API, I either need to replicate the way the Screen maintains state, or move wholesale to full double buffering, so that every Effect redraws on a refresh.

[peterbrittain]

In other words, I might need to do #24 before this...

[peterbrittain]

There is currently an experimental feature for doing this in V1.7. However this API will need to change when this issue is resolved.

[decentral1se]

Hey there @peterbrittain, did this land? I see you're already on a v1.9.

Will be looking into how to do this today.

EDIT: Actually, what I am looking for, is putting a sprite in a layout.

[peterbrittain]

There's the ability to embed effects inside a Frame, but not Layouts. To take it further, the Frame drawing logic and Effects really need to be aligned. Right now, one forces widgets to do a full redraw, but the other leaves it up to the update logic how to remove old content.

I plan to reconcile In version 2.0 when full double buffering and redrawing will be enforced everywhere.