Draw the tab list as a webview, VS-style
A tree view row cannot be styled: no border, no spacing, and a long file name gets middle-ellipsized in a narrow strip — which on a real project left "ClientDogSurger...nionBehaviour.cs" and hid the project text entirely. Drawing the rows means controlling all of it. - A coloured left border per project instead of a tinted icon, so the file icon slot is free and the name gets the width. The border uses var(--vscode-verticalTabs-projectN): VS Code injects every contributed theme colour into a webview, so overrides in colorCustomizations still apply and nothing is hardcoded. - The name is split into stem and extension, and only the stem ellipsizes, so ".cs" survives on a long name in a narrow view. - Configurable row spacing and border width, a rule under the pinned block, a dirty dot that the close button replaces on hover, italics for preview and for tabs that cannot be focused. - Selection, arrow/Home/End/Enter/Delete keys, middle-click to close, and an HTML context menu, since contributes.menus does not reach webview rows. - Clicking a webview row posts nothing rather than asking for an open that would silently do nothing. Actions moved to actions.ts so the wiring, the view and the tests share one implementation; extension.ts is now just registration. The per-row commands are gone — rows act through webview messages — and the palette keeps close / closeOthers / togglePin acting on the active editor. Verified in a browser harness at side-bar width: all twelve project colours resolve, rows stay a consistent 24px, and click, pin, close, middle-click, keyboard and both context-menu variants post the right intents. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Claude Opus 5
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/* Vertical Tabs — the tab list */
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:root {
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--row-gap: 2px;
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--border-width: 3px;
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}
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* {
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box-sizing: border-box;
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}
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html,
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body {
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height: 100%;
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margin: 0;
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padding: 0;
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overflow: hidden;
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}
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body {
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color: var(--vscode-foreground);
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background: var(--vscode-sideBar-background, transparent);
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font-family: var(--vscode-font-family);
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font-size: var(--vscode-font-size);
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}
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#list {
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height: 100%;
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padding: 3px 0;
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overflow-x: hidden;
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overflow-y: auto;
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outline: none;
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}
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/* --- a row -------------------------------------------------------------- */
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.tab {
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display: flex;
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align-items: center;
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gap: 5px;
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min-height: 24px;
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margin: 0 2px var(--row-gap);
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padding: 2px 4px 2px 5px;
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border-left: var(--border-width) solid var(--tab-color, transparent);
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border-radius: 0 3px 3px 0;
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cursor: pointer;
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user-select: none;
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/* the close button only takes space while it is visible */
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overflow: hidden;
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}
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.tab:hover {
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background: var(--vscode-list-hoverBackground);
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}
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.tab.active {
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color: var(--vscode-list-activeSelectionForeground);
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background: var(--vscode-list-activeSelectionBackground);
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}
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.tab.selected:not(.active) {
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background: var(--vscode-list-inactiveSelectionBackground);
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}
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#list:focus-visible .tab.selected {
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outline: 1px solid var(--vscode-focusBorder);
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outline-offset: -1px;
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}
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.tab.inert {
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cursor: default;
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}
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.tab.inert .name {
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font-style: italic;
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opacity: 0.75;
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}
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/* --- the file name ------------------------------------------------------ */
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.name {
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display: flex;
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flex: 1 1 auto;
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min-width: 0;
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align-items: baseline;
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white-space: nowrap;
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}
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/* The stem shrinks and ellipsizes; the extension never does, so ".cs" stays
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readable on a long name in a narrow strip. */
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.stem {
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overflow: hidden;
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text-overflow: ellipsis;
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}
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.ext {
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flex: 0 0 auto;
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opacity: 0.8;
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}
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.tab.preview .name {
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font-style: italic;
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}
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.dir {
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flex: 0 1 auto;
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min-width: 0;
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overflow: hidden;
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color: var(--vscode-descriptionForeground);
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font-size: 0.9em;
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text-overflow: ellipsis;
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white-space: nowrap;
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}
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/* --- markers and buttons ------------------------------------------------ */
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.marker {
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flex: 0 0 auto;
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width: 16px;
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height: 16px;
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display: flex;
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align-items: center;
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justify-content: center;
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color: var(--vscode-icon-foreground);
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border-radius: 3px;
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opacity: 0.85;
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}
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.marker svg {
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width: 12px;
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height: 12px;
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fill: currentColor;
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}
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button.marker {
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padding: 0;
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background: none;
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border: none;
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cursor: pointer;
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opacity: 0;
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}
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.tab:hover button.marker,
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.tab.active button.marker,
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button.marker.on,
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button.marker:focus-visible {
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opacity: 1;
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}
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button.marker:hover {
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background: var(--vscode-toolbar-hoverBackground);
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}
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button.marker:focus-visible {
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outline: 1px solid var(--vscode-focusBorder);
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outline-offset: -1px;
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}
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/* An unsaved file shows a dot, which the close button replaces on hover. */
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.dirty {
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flex: 0 0 auto;
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width: 16px;
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display: flex;
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justify-content: center;
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}
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.dirty::before {
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content: '';
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width: 8px;
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height: 8px;
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border-radius: 50%;
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background: currentColor;
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}
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.tab:hover .dirty,
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.tab.active .dirty {
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display: none;
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}
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.tab:not(.is-dirty) .dirty {
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display: none;
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}
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.tab:not(:hover):not(.active) button.close {
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display: none;
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}
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/* --- the pinned block --------------------------------------------------- */
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.separator {
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height: 1px;
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margin: 4px 6px 5px;
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background: var(--vscode-sideBarSectionHeader-border, var(--vscode-panel-border));
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opacity: 0.6;
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}
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/* --- context menu ------------------------------------------------------- */
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#menu {
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position: fixed;
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z-index: 20;
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min-width: 180px;
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padding: 4px;
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color: var(--vscode-menu-foreground, var(--vscode-foreground));
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background: var(--vscode-menu-background, var(--vscode-editorWidget-background));
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border: 1px solid var(--vscode-menu-border, var(--vscode-editorWidget-border));
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border-radius: 4px;
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box-shadow: 0 2px 8px var(--vscode-widget-shadow, rgba(0, 0, 0, 0.36));
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}
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#menu[hidden] {
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display: none;
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}
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#menu button {
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display: block;
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width: 100%;
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padding: 4px 8px;
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color: inherit;
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background: none;
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border: none;
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border-radius: 2px;
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font-family: inherit;
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font-size: inherit;
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text-align: left;
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white-space: nowrap;
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cursor: pointer;
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}
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#menu button:hover,
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#menu button:focus-visible {
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color: var(--vscode-menu-selectionForeground, inherit);
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background: var(--vscode-menu-selectionBackground, var(--vscode-list-hoverBackground));
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outline: none;
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}
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#menu .menu-separator {
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height: 1px;
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margin: 4px 2px;
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background: var(--vscode-menu-separatorBackground, var(--vscode-panel-border));
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}
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/* --- empty state -------------------------------------------------------- */
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#empty {
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padding: 10px 12px;
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color: var(--vscode-descriptionForeground);
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}
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#empty[hidden] {
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display: none;
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}
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