Render annotation flags over track group headers #97
Conversation
All track rendering was done on a big scrolling canvas element that sits behind the track dividing lines and shells. That is fine for rendering stuff in the track content area of the scrolling tracks, but the track content area of the headers of expanded groups does not scroll with the rest. They're not even a part of the same static layout, instead being positioned relatively and moreover sticking to the top of the panel as tracks scroll up beneath them. Because they are in a different layout to the canvas, they occlude anything painted on the canvas, so painting in the expanded group headers has no effect. Consequently, it is necessary to give each expanded group header its own canvas on which we can draw content such as the stems of note flags. Signed-off-by: Christian W. Damus <[email protected]>
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Adding or removing a note while the sticky open track group is still there tends to make the annotations drawn on it stale. staleNoteLines-2024-02-28_12.47.34.mp4 |
The algorithm for determining what needs to be redrawn didn't account for the fact that a group header that would be scrolled offscreen and so not need redrawing when collapsed might be sticky and still onscreen when expanded. So now we redraw an expanded group header if it really seems to be onscreen _or_ if any member within it (recursively) is onscreen (which would imply that the group header is sticky at the top.) Signed-off-by: Christian W. Damus <[email protected]>
Great find! Thanks. That was a tricky case and should be fixed in commit 4a6af55. |
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While the annotation lines are no longer stale, the ones added while the sticky header is up are not the same length |
Ah. What's happening here is that a group header has tucked up underneath another header that is not as high. In light mode, you would see that the header on top has a line ① running along its bottom edge and the apparent gap ② is just where the header underneath doesn't know it still needs to be drawn.
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Signed-off-by: Christian W. Damus <[email protected]>
@ALevansSamsung this should be fixed with commit b450b90 which, overall, simplifies the code greatly by not trying to be clever about efficient drawing of something is known not to be complex to draw 😀 |
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Still seems to be an issue with staleness |
All track rendering was done on a big scrolling canvas element that sits behind the track dividing lines and shells. That is fine for rendering stuff in the track content area of the scrolling tracks, but the track content area of the headers of expanded groups does not scroll with the rest. They're not even a part of the same static layout, instead being positioned relatively and moreover sticking to the top of the panel as tracks scroll up beneath them. Because they are in a different layout to the canvas, they occlude anything painted on the canvas, so painting in the expanded group headers has no effect.
Consequently, it is necessary to give each expanded group header its own canvas on which we can draw content such as the stems of note flags.