Merge commit 'be3e8236086165e5e45a5a10783823874b3f3ebd' as 'lib/vscode'

2020-12-15 15:52:33 -07:00
parent 6c5c22ea8e be3e823608
commit 41bee49d07
4649 changed files with 1311795 additions and 0 deletions
--- a/lib/vscode/src/vs/base/browser/ui/scrollbar/scrollbarVisibilityController.ts
+++ b/lib/vscode/src/vs/base/browser/ui/scrollbar/scrollbarVisibilityController.ts
@ -0,0 +1,108 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import { FastDomNode } from 'vs/base/browser/fastDomNode';
+import { TimeoutTimer } from 'vs/base/common/async';
+import { Disposable } from 'vs/base/common/lifecycle';
+import { ScrollbarVisibility } from 'vs/base/common/scrollable';
+
+export class ScrollbarVisibilityController extends Disposable {
+	private _visibility: ScrollbarVisibility;
+	private _visibleClassName: string;
+	private _invisibleClassName: string;
+	private _domNode: FastDomNode<HTMLElement> | null;
+	private _shouldBeVisible: boolean;
+	private _isNeeded: boolean;
+	private _isVisible: boolean;
+	private _revealTimer: TimeoutTimer;
+
+	constructor(visibility: ScrollbarVisibility, visibleClassName: string, invisibleClassName: string) {
+		super();
+		this._visibility = visibility;
+		this._visibleClassName = visibleClassName;
+		this._invisibleClassName = invisibleClassName;
+		this._domNode = null;
+		this._isVisible = false;
+		this._isNeeded = false;
+		this._shouldBeVisible = false;
+		this._revealTimer = this._register(new TimeoutTimer());
+	}
+
+	// ----------------- Hide / Reveal
+
+	private applyVisibilitySetting(shouldBeVisible: boolean): boolean {
+		if (this._visibility === ScrollbarVisibility.Hidden) {
+			return false;
+		}
+		if (this._visibility === ScrollbarVisibility.Visible) {
+			return true;
+		}
+		return shouldBeVisible;
+	}
+
+	public setShouldBeVisible(rawShouldBeVisible: boolean): void {
+		let shouldBeVisible = this.applyVisibilitySetting(rawShouldBeVisible);
+
+		if (this._shouldBeVisible !== shouldBeVisible) {
+			this._shouldBeVisible = shouldBeVisible;
+			this.ensureVisibility();
+		}
+	}
+
+	public setIsNeeded(isNeeded: boolean): void {
+		if (this._isNeeded !== isNeeded) {
+			this._isNeeded = isNeeded;
+			this.ensureVisibility();
+		}
+	}
+
+	public setDomNode(domNode: FastDomNode<HTMLElement>): void {
+		this._domNode = domNode;
+		this._domNode.setClassName(this._invisibleClassName);
+
+		// Now that the flags & the dom node are in a consistent state, ensure the Hidden/Visible configuration
+		this.setShouldBeVisible(false);
+	}
+
+	public ensureVisibility(): void {
+
+		if (!this._isNeeded) {
+			// Nothing to be rendered
+			this._hide(false);
+			return;
+		}
+
+		if (this._shouldBeVisible) {
+			this._reveal();
+		} else {
+			this._hide(true);
+		}
+	}
+
+	private _reveal(): void {
+		if (this._isVisible) {
+			return;
+		}
+		this._isVisible = true;
+
+		// The CSS animation doesn't play otherwise
+		this._revealTimer.setIfNotSet(() => {
+			if (this._domNode) {
+				this._domNode.setClassName(this._visibleClassName);
+			}
+		}, 0);
+	}
+
+	private _hide(withFadeAway: boolean): void {
+		this._revealTimer.cancel();
+		if (!this._isVisible) {
+			return;
+		}
+		this._isVisible = false;
+		if (this._domNode) {
+			this._domNode.setClassName(this._invisibleClassName + (withFadeAway ? ' fade' : ''));
+		}
+	}
+}