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Unify increaseScale/decreaseScale logic as updateScale

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`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.
This commit is contained in:
Nicolò Ribaudo 2024-05-21 15:32:59 +02:00
parent 95a7de9f98
commit 161c7045f6
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GPG key ID: AAFDA9101C58F338
2 changed files with 38 additions and 69 deletions
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56
web/pdf_viewer.js
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@ -2125,51 +2125,47 @@ class PDFViewer {
*/
/**
* Increase the current zoom level one, or more, times.
* Changes the current zoom level by the specified amount.
* @param {ChangeScaleOptions} [options]
*/
increaseScale({ drawingDelay, scaleFactor, steps } = {}) {
updateScale({ drawingDelay, scaleFactor = null, steps = null }) {
if (steps === null && scaleFactor === null) {
throw new Error(
"Invalid updateScale options: either `steps` or `scaleFactor` must be provided."
);
}
if (!this.pdfDocument) {
return;
}
let newScale = this._currentScale;
if (scaleFactor > 1) {
if (scaleFactor > 0 && scaleFactor !== 1) {
newScale = Math.round(newScale * scaleFactor * 100) / 100;
} else {
steps ??= 1;
} else if (steps) {
const delta = steps > 0 ? DEFAULT_SCALE_DELTA : 1 / DEFAULT_SCALE_DELTA;
const round = steps > 0 ? Math.ceil : Math.floor;
steps = Math.abs(steps);
do {
newScale =
Math.ceil((newScale * DEFAULT_SCALE_DELTA).toFixed(2) * 10) / 10;
} while (--steps > 0 && newScale < MAX_SCALE);
newScale = round((newScale * delta).toFixed(2) * 10) / 10;
} while (--steps > 0);
}
this.#setScale(Math.min(MAX_SCALE, newScale), {
noScroll: false,
drawingDelay,
});
newScale = Math.max(MIN_SCALE, Math.min(MAX_SCALE, newScale));
this.#setScale(newScale, { noScroll: false, drawingDelay });
}
/**
* Increase the current zoom level one, or more, times.
* @param {ChangeScaleOptions} [options]
*/
increaseScale(options = {}) {
this.updateScale({ ...options, steps: options.steps ?? 1 });
}
/**
* Decrease the current zoom level one, or more, times.
* @param {ChangeScaleOptions} [options]
*/
decreaseScale({ drawingDelay, scaleFactor, steps } = {}) {
if (!this.pdfDocument) {
return;
}
let newScale = this._currentScale;
if (scaleFactor > 0 && scaleFactor < 1) {
newScale = Math.round(newScale * scaleFactor * 100) / 100;
} else {
steps ??= 1;
do {
newScale =
Math.floor((newScale / DEFAULT_SCALE_DELTA).toFixed(2) * 10) / 10;
} while (--steps > 0 && newScale > MIN_SCALE);
}
this.#setScale(Math.max(MIN_SCALE, newScale), {
noScroll: false,
drawingDelay,
});
decreaseScale(options = {}) {
this.updateScale({ ...options, steps: -(options.steps ?? 1) });
}
#updateContainerHeightCss(height = this.container.clientHeight) {