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Let the sidebar be resized by dragging its edge

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The sidebar's right edge is now a splitter, like the one between the
message list and the reading pane: drag it between 240 and 480px, move it
with the arrow keys, double-click to put it back. The width is a device
setting, and stays null until someone drags, so a width set in the
reader's own CSS through --sidebar-w is kept until they choose otherwise.
Hidden on a phone, where the sidebar is a drawer, and while collapsed.

Arrow keys on either splitter moved the pane and never saved it: the
keyboard path called onResize without onEnd. It ends each key press now,
and both views keep the in-progress size in a ref as well as state, so
the end reads the value set in the same tick.

The message-list splitter's accessible name was an untranslated literal.
It goes through translate() now, and it and the sidebar's new name are in
all nine catalogues.

Closes #345
This commit is contained in:
jcoffey-dev
2026-09-14 07:54:56 -07:00
parent 1dc0caeae9
commit abb07acc80
16 changed files with 120 additions and 16 deletions
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web/src/views/mail/MailView.tsx
+10 -4
View File
@@ -385,18 +385,24 @@ export function MailView({ mailboxId, threadId, search }: { mailboxId?: string;
const layoutRef = useRef<HTMLDivElement>(null);
const updateSettings = useSettings((s) => s.update);
const [liveSize, setLiveSize] = useState<number | null>(null);
// Mirrors liveSize for the end of a key press, which follows the resize in
// the same tick -- before the state could have come back round.
const liveSizeRef = useRef<number | null>(null);
const paneSize = liveSize ?? (settings.readingPane === "bottom" ? settings.listPaneHeight : settings.listPaneWidth);
const onSplit = (delta: number) => {
const el = layoutRef.current;
const total = el ? (settings.readingPane === "bottom" ? el.clientHeight : el.clientWidth) : 1200;
const min = settings.readingPane === "bottom" ? 160 : 320;
const max = Math.max(min, total - (settings.readingPane === "bottom" ? 200 : 420));
setLiveSize((cur) => Math.min(max, Math.max(min, (cur ?? paneSize) + delta)));
const next = Math.min(max, Math.max(min, (liveSizeRef.current ?? paneSize) + delta));
liveSizeRef.current = next;
setLiveSize(next);
};
const onSplitEnd = () => {
if (liveSize == null) return;
updateSettings(settings.readingPane === "bottom" ? { listPaneHeight: liveSize } : { listPaneWidth: liveSize });
const size = liveSizeRef.current;
liveSizeRef.current = null;
setLiveSize(null);
if (size != null) updateSettings(settings.readingPane === "bottom" ? { listPaneHeight: size } : { listPaneWidth: size });
};
return (
@@ -416,7 +422,7 @@ export function MailView({ mailboxId, threadId, search }: { mailboxId?: string;
/>
)}
{showList && showReading && settings.readingPane !== "off" && !narrow && (
<Splitter direction={settings.readingPane === "bottom" ? "horizontal" : "vertical"} onResize={onSplit} onEnd={onSplitEnd} onReset={() => updateSettings(settings.readingPane === "bottom" ? { listPaneHeight: 340 } : { listPaneWidth: 520 })} ariaLabel="Resize message list" />
<Splitter direction={settings.readingPane === "bottom" ? "horizontal" : "vertical"} onResize={onSplit} onEnd={onSplitEnd} onReset={() => updateSettings(settings.readingPane === "bottom" ? { listPaneHeight: 340 } : { listPaneWidth: 520 })} ariaLabel={translate("Resize message list")} />
)}
{showReading && (
<div className="mail-reading-pane">