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Unify increaseScale
/decreaseScale
logic as updateScale
`updateScale` receives a `drawingDelay`, a `scaleFactor` and/or a number of `steps`. If `scaleFactor` is a positive number different from `1` the current scale is multiplied by that number. Otherwise, if `steps` if a positive integer the current scale is multiplied by `DEFAULT_SCALE_DELTA` `steps` times. Finally, if `steps` is a negative integer, the current scale is divided by `DEFAULT_SCALE_DELTA` `abs(steps)` times.
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2 changed files with 38 additions and 69 deletions
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@ -2125,51 +2125,47 @@ class PDFViewer {
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*/
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/**
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* Increase the current zoom level one, or more, times.
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* Changes the current zoom level by the specified amount.
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* @param {ChangeScaleOptions} [options]
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*/
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increaseScale({ drawingDelay, scaleFactor, steps } = {}) {
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updateScale({ drawingDelay, scaleFactor = null, steps = null }) {
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if (steps === null && scaleFactor === null) {
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throw new Error(
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"Invalid updateScale options: either `steps` or `scaleFactor` must be provided."
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);
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}
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if (!this.pdfDocument) {
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return;
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}
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let newScale = this._currentScale;
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if (scaleFactor > 1) {
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if (scaleFactor > 0 && scaleFactor !== 1) {
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newScale = Math.round(newScale * scaleFactor * 100) / 100;
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} else {
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steps ??= 1;
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} else if (steps) {
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const delta = steps > 0 ? DEFAULT_SCALE_DELTA : 1 / DEFAULT_SCALE_DELTA;
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const round = steps > 0 ? Math.ceil : Math.floor;
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steps = Math.abs(steps);
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do {
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newScale =
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Math.ceil((newScale * DEFAULT_SCALE_DELTA).toFixed(2) * 10) / 10;
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} while (--steps > 0 && newScale < MAX_SCALE);
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newScale = round((newScale * delta).toFixed(2) * 10) / 10;
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} while (--steps > 0);
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}
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this.#setScale(Math.min(MAX_SCALE, newScale), {
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noScroll: false,
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drawingDelay,
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});
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newScale = Math.max(MIN_SCALE, Math.min(MAX_SCALE, newScale));
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this.#setScale(newScale, { noScroll: false, drawingDelay });
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}
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/**
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* Increase the current zoom level one, or more, times.
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* @param {ChangeScaleOptions} [options]
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*/
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increaseScale(options = {}) {
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this.updateScale({ ...options, steps: options.steps ?? 1 });
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}
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/**
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* Decrease the current zoom level one, or more, times.
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* @param {ChangeScaleOptions} [options]
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*/
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decreaseScale({ drawingDelay, scaleFactor, steps } = {}) {
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if (!this.pdfDocument) {
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return;
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}
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let newScale = this._currentScale;
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if (scaleFactor > 0 && scaleFactor < 1) {
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newScale = Math.round(newScale * scaleFactor * 100) / 100;
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} else {
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steps ??= 1;
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do {
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newScale =
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Math.floor((newScale / DEFAULT_SCALE_DELTA).toFixed(2) * 10) / 10;
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} while (--steps > 0 && newScale > MIN_SCALE);
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}
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this.#setScale(Math.max(MIN_SCALE, newScale), {
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noScroll: false,
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drawingDelay,
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});
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decreaseScale(options = {}) {
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this.updateScale({ ...options, steps: -(options.steps ?? 1) });
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}
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#updateContainerHeightCss(height = this.container.clientHeight) {
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