TypeScript RenderingContext.getVerticalOffsetForLineNumber方法代码示例

	private _prepareRender(ctx: RenderingContext): ViewCursorRenderData {
		let textContent = '';
		let textContentClassName = '';

		if (this._cursorStyle === TextEditorCursorStyle.Line || this._cursorStyle === TextEditorCursorStyle.LineThin) {
			const visibleRange = ctx.visibleRangeForPosition(this._position);
			if (!visibleRange) {
				// Outside viewport
				return null;
			}
			let width: number;
			if (this._cursorStyle === TextEditorCursorStyle.Line) {
				width = dom.computeScreenAwareSize(this._lineCursorWidth > 0 ? this._lineCursorWidth : 2);
				if (width > 2) {
					const lineContent = this._context.model.getLineContent(this._position.lineNumber);
					textContent = lineContent.charAt(this._position.column - 1);
				}
			} else {
				width = dom.computeScreenAwareSize(1);
			}
			let left = visibleRange.left;
			if (width >= 2 && left >= 1) {
				// try to center cursor
				left -= 1;
			}
			const top = ctx.getVerticalOffsetForLineNumber(this._position.lineNumber) - ctx.bigNumbersDelta;
			return new ViewCursorRenderData(top, left, width, this._lineHeight, textContent, textContentClassName);
		}

		const visibleRangeForCharacter = ctx.linesVisibleRangesForRange(new Range(this._position.lineNumber, this._position.column, this._position.lineNumber, this._position.column + 1), false);

		if (!visibleRangeForCharacter || visibleRangeForCharacter.length === 0 || visibleRangeForCharacter[0].ranges.length === 0) {
			// Outside viewport
			return null;
		}

		const range = visibleRangeForCharacter[0].ranges[0];
		const width = range.width < 1 ? this._typicalHalfwidthCharacterWidth : range.width;

		if (this._cursorStyle === TextEditorCursorStyle.Block) {
			const lineData = this._context.model.getViewLineData(this._position.lineNumber);
			textContent = lineData.content.charAt(this._position.column - 1);
			if (strings.isHighSurrogate(lineData.content.charCodeAt(this._position.column - 1))) {
				textContent += lineData.content.charAt(this._position.column);
			}
			const tokenIndex = lineData.tokens.findTokenIndexAtOffset(this._position.column - 1);
			textContentClassName = lineData.tokens.getClassName(tokenIndex);
		}

		let top = ctx.getVerticalOffsetForLineNumber(this._position.lineNumber) - ctx.bigNumbersDelta;
		let height = this._lineHeight;

		// Underline might interfere with clicking
		if (this._cursorStyle === TextEditorCursorStyle.Underline || this._cursorStyle === TextEditorCursorStyle.UnderlineThin) {
			top += this._lineHeight - 2;
			height = 2;
		}

		return new ViewCursorRenderData(top, range.left, width, height, textContent, textContentClassName);
	}

	private _getTopLeft(ctx: RenderingContext, position: Position): Coordinate {
		const visibleRange = ctx.visibleRangeForPosition(position);
		if (!visibleRange) {
			return null;
		}

		const top = ctx.getVerticalOffsetForLineNumber(position.lineNumber) - ctx.scrollTop;
		return new Coordinate(top, visibleRange.left);
	}

	/**
	 * Compute `this._topLeft`
	 */
	private _getTopAndBottomLeft(ctx: RenderingContext): [Coordinate, Coordinate] | [null, null] {
		if (!this._viewPosition) {
			return [null, null];
		}

		const visibleRangeForPosition = ctx.visibleRangeForPosition(this._viewPosition);
		if (!visibleRangeForPosition) {
			return [null, null];
		}

		const topForPosition = ctx.getVerticalOffsetForLineNumber(this._viewPosition.lineNumber) - ctx.scrollTop;
		const topLeft = new Coordinate(topForPosition, visibleRangeForPosition.left);

		let largestLineNumber = this._viewPosition.lineNumber;
		let smallestLeft = visibleRangeForPosition.left;

		if (this._viewRange) {
			const visibleRangesForRange = ctx.linesVisibleRangesForRange(this._viewRange, false);
			if (visibleRangesForRange && visibleRangesForRange.length > 0) {
				for (let i = visibleRangesForRange.length - 1; i >= 0; i--) {
					const visibleRangesForLine = visibleRangesForRange[i];
					if (visibleRangesForLine.lineNumber >= largestLineNumber) {
						if (visibleRangesForLine.lineNumber > largestLineNumber) {
							largestLineNumber = visibleRangesForLine.lineNumber;
							smallestLeft = Constants.MAX_SAFE_SMALL_INTEGER;
						}
						for (let j = 0, lenJ = visibleRangesForLine.ranges.length; j < lenJ; j++) {
							const visibleRange = visibleRangesForLine.ranges[j];

							if (visibleRange.left < smallestLeft) {
								smallestLeft = visibleRange.left;
							}
						}
					}
				}
			}
		}

		const topForBottomLine = ctx.getVerticalOffsetForLineNumber(largestLineNumber) - ctx.scrollTop;
		const bottomLeft = new Coordinate(topForBottomLine, smallestLeft);

		return [topLeft, bottomLeft];
	}

	private _prepareRender(ctx: RenderingContext): ViewCursorRenderData {
		if (this._cursorStyle === TextEditorCursorStyle.Line || this._cursorStyle === TextEditorCursorStyle.LineThin) {
			const visibleRange = ctx.visibleRangeForPosition(this._position);
			if (!visibleRange) {
				// Outside viewport
				return null;
			}
			let width: number;
			if (this._cursorStyle === TextEditorCursorStyle.Line) {
				width = 2;
			} else {
				width = 1;
			}
			const top = ctx.getVerticalOffsetForLineNumber(this._position.lineNumber) - ctx.bigNumbersDelta;
			return new ViewCursorRenderData(top, visibleRange.left, width, '');
		}

		const visibleRangeForCharacter = ctx.linesVisibleRangesForRange(new Range(this._position.lineNumber, this._position.column, this._position.lineNumber, this._position.column + 1), false);

		if (!visibleRangeForCharacter || visibleRangeForCharacter.length === 0 || visibleRangeForCharacter[0].ranges.length === 0) {
			// Outside viewport
			return null;
		}

		const range = visibleRangeForCharacter[0].ranges[0];
		const width = range.width < 1 ? this._typicalHalfwidthCharacterWidth : range.width;

		let textContent = '';
		if (this._cursorStyle === TextEditorCursorStyle.Block) {
			const lineContent = this._context.model.getLineContent(this._position.lineNumber);
			textContent = lineContent.charAt(this._position.column - 1);
		}

		const top = ctx.getVerticalOffsetForLineNumber(this._position.lineNumber) - ctx.bigNumbersDelta;
		return new ViewCursorRenderData(top, range.left, width, textContent);
	}