Add the ability to drag and drop Doodads onto the level. The Doodad
buttons on the palette now trigger a Drag/Drop behavior when clicked,
and a "blueprint colored" version of the Doodad follows your cursor,
centered on it.
Actors are assigned a random UUID ID when they are placed into a level.
The Canvas gained a MaskColor property that forces all pixels in the
drawing to render as the same color. This is a visual-only effect, and
is used when dragging Doodads in so they render as "blueprints" instead
of their actual colors until they are dropped.
Fix the chunk bitmap cache system so it saves in the $XDG_CACHE_FOLDER
instead of /tmp and has better names. They go into
`~/.config/doodle/chunks/` and have UUID file names -- but they
disappear quickly! As soon as they are cached into SDL2 they are removed
from disk.
Other changes:
- UI: Add Hovering() method that returns the widgets that are beneath
a point (your cursor) and those that are not, for easy querying
for event propagation.
- UI: Add ability to return an ErrStopPropagation to tell the master
Scene (outside the UI) not to continue sending events to other
parts of the code, so that you don't draw pixels during a drag
event.
Noah Petherbridge
0044b72943