bc19503419
## Issue Closes 4501 `Font size` ## New behavior The Desktop app can now zoom the same way as browsers: - Zoom In: "Ctrl+=" or "Ctrl+numpadPlus" or "Ctrl+WheelUp" - Zoom Out: "Ctrl+-" or "Ctrl+numpadMinus" or "Ctrl+WheelDown" - Zoom Reset: "Ctrl+0" or "Ctrl+numpad0" ## Code changes (1) Electron provides this functionality through the `zoomIn|zoomOut|resetZoom` roles in the Menu, so it would have been a quick job. However, given that Electron currently does not support having multiple accelerators for one item, we can't add `Ctrl+WheelUp` to the mix and would have to implement our own handler and use `webFrame`. Given that we need to add code anyways, we handle both keyboard and mouse cases through the same handler, hence the existence of `zoomWindow.js`. It also provides the opportunity to few a few quirks with Electron's default implementation (e.g. stuck at both extremes) (2) I recall there is another Issue for adding keyboard shortcuts. Given that these shortcuts are universally used in browsers, they are probably "reserved", so shouldn't clash with that task.
43 lines
1.1 KiB
JavaScript
43 lines
1.1 KiB
JavaScript
import { webFrame } from 'electron';
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const isDev = process.env.NODE_ENV !== 'production';
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export const ZOOM = {
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INCREMENT: 'INCREMENT',
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DECREMENT: 'DECREMENT',
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RESET: 'RESET',
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};
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function getNextZoomFactor(curFactor, isIncreasing) {
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const zoomTable = [0.25, 0.33, 0.5, 0.67, 0.75, 0.8, 0.9, 1.0, 1.1, 1.25, 1.5, 1.75, 2.0, 2.5, 3.0];
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curFactor = curFactor.toPrecision(3);
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let i = zoomTable.length;
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while (curFactor < zoomTable[--i]) {}
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if (isIncreasing) {
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return zoomTable[Math.min(zoomTable.length - 1, i + 1)];
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} else {
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return zoomTable[Math.max(0, i - 1)];
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}
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}
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export function changeZoomFactor(action) {
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const ZOOM_DFLT_FACTOR = 1.0;
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const curFactor = webFrame.getZoomFactor();
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switch (action) {
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case ZOOM.INCREMENT:
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webFrame.setZoomFactor(getNextZoomFactor(curFactor, true));
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break;
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case ZOOM.DECREMENT:
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webFrame.setZoomFactor(getNextZoomFactor(curFactor, false));
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break;
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case ZOOM.RESET:
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webFrame.setZoomFactor(ZOOM_DFLT_FACTOR);
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break;
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default:
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if (isDev) throw new Error('changeZoomFactor: unexpected action');
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break;
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}
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}
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