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Simplify terminal sticky scroll refresh by deferring to microtask

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Fixes #207959
This commit is contained in:
Daniel Imms 2024-03-22 09:19:03 -07:00
parent 712a3eefbd
commit 789b9095a0
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GPG key ID: E5CF412B63651C69
1 changed files with 7 additions and 28 deletions
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35
src/vs/workbench/contrib/terminalContrib/stickyScroll/browser/terminalStickyScrollOverlay.ts
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@ -59,6 +59,7 @@ export class TerminalStickyScrollOverlay extends Disposable {
private _refreshListeners = this._register(new MutableDisposable());
private _state: OverlayState = OverlayState.Off;
private _isRefreshQueued = false;
private _rawMaxLineCount: number = 5;
constructor(
@ -114,7 +115,7 @@ export class TerminalStickyScrollOverlay extends Disposable {
}));
this._register(this._xterm.raw.onResize(() => {
this._syncOptions();
this._throttledRefresh();
this._refresh();
}));
this._getSerializeAddonConstructor().then(SerializeAddon => {
@ -175,37 +176,15 @@ export class TerminalStickyScrollOverlay extends Disposable {
this._element?.classList.toggle(CssClasses.Visible, isVisible);
}
/**
* The entry point to refresh sticky scroll. This is synchronous and will call into the method
* that actually refreshes using either debouncing or throttling depending on the situation.
*
* The goal is that if the command has changed to update immediately (with throttling) and if
* the command is the same then update with debouncing as it's less likely updates will show up.
* This approach also helps with:
*
* - Cursor move only updates such as moving horizontally in pagers which without this may show
* the sticky scroll before hiding it again almost immediately due to everything not being
* parsed yet.
* - Improving performance due to deferring less important updates via debouncing.
* - Less flickering when scrolling, while still updating immediately when the command changes.
*/
private _refresh(): void {
if (!this._xterm.raw.element?.parentElement || !this._stickyScrollOverlay || !this._serializeAddon) {
if (this._isRefreshQueued) {
return;
}
const command = this._commandDetection.getCommandForLine(this._xterm.raw.buffer.active.viewportY);
if (command && this._currentStickyCommand !== command) {
this._throttledRefresh();
} else {
// If it's the same command, do not throttle as the sticky scroll overlay height may
// need to be adjusted. This would cause a flicker if throttled.
this._isRefreshQueued = true;
queueMicrotask(() => {
this._refreshNow();
}
}
@throttle(0)
private _throttledRefresh(): void {
this._refreshNow();
this._isRefreshQueued = false;
});
}
private _refreshNow(): void {