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Move the zoomIn/zoomOut functionality into BaseViewer (PR 14038 follow-up)

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Given the simplicity of this functionality, we can move it from the default viewer and into the `BaseViewer` class instead. This way, it's possible to support more scripting functionality in the standalone viewer components; please see PR 14038.

Please note that I purposely went with `increaseScale`/`decreaseScale`-method names, rather than using "zoom", to better match the existing `currentScale`/`currentScaleValue` getters/setters that's being used in the `BaseViewer` class.
This commit is contained in:
Jonas Jenwald 2021-09-19 11:54:57 +02:00
parent 83d3bb43f4
commit d9f9fa4f1c
4 changed files with 39 additions and 21 deletions
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31
web/base_viewer.js
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@ -17,6 +17,7 @@ import { AnnotationMode, createPromiseCapability, version } from "pdfjs-lib";
import {
CSS_UNITS,
DEFAULT_SCALE,
DEFAULT_SCALE_DELTA,
DEFAULT_SCALE_VALUE,
getVisibleElements,
isPortraitOrientation,
@ -24,6 +25,8 @@ import {
isValidScrollMode,
isValidSpreadMode,
MAX_AUTO_SCALE,
MAX_SCALE,
MIN_SCALE,
moveToEndOfArray,
PresentationModeState,
RendererType,
@ -1693,6 +1696,34 @@ class BaseViewer {
this.currentPageNumber = Math.max(currentPageNumber - advance, 1);
return true;
}
/**
* Increase the current zoom level one, or more, times.
* @param {number} [steps] - Defaults to zooming once.
*/
increaseScale(steps = 1) {
let newScale = this._currentScale;
do {
newScale = (newScale * DEFAULT_SCALE_DELTA).toFixed(2);
newScale = Math.ceil(newScale * 10) / 10;
newScale = Math.min(MAX_SCALE, newScale);
} while (--steps > 0 && newScale < MAX_SCALE);
this.currentScaleValue = newScale;
}
/**
* Decrease the current zoom level one, or more, times.
* @param {number} [steps] - Defaults to zooming once.
*/
decreaseScale(steps = 1) {
let newScale = this._currentScale;
do {
newScale = (newScale / DEFAULT_SCALE_DELTA).toFixed(2);
newScale = Math.floor(newScale * 10) / 10;
newScale = Math.max(MIN_SCALE, newScale);
} while (--steps > 0 && newScale > MIN_SCALE);
this.currentScaleValue = newScale;
}
}
export { BaseViewer };