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Zoom control tooltips

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This commit is contained in:
Arne Keller 2021-03-11 14:56:01 +01:00
parent 0c2836a27f
commit 1dab9a3996
1 changed files with 10 additions and 2 deletions
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12
frontend/src/mathjax-proof-tree.ts
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@ -14,6 +14,7 @@ declare let window: {
// these attributes and functions are supported by major browsers, but TS does not know about them
declare global {
interface SVGElement {
getElementById: (id: string) => SVGGraphicsElement | null;
viewBox: SVGAnimatedRect;
}
@ -295,9 +296,16 @@ class MathjaxProofTree extends MathjaxAdapter {
}
}
});
// @ts-ignore
let matrix = svg.getElementById("svg-pan-zoom-controls").transform.baseVal[0].matrix;
// add tooltips to buttons
const zoomIn = document.createElementNS("http://www.w3.org/2000/svg", "title");
zoomIn.append(document.createTextNode("zoom in"));
svg.getElementById("svg-pan-zoom-zoom-in")!.children[0].appendChild(zoomIn);
const zoomOut = document.createElementNS("http://www.w3.org/2000/svg", "title");
zoomOut.append(document.createTextNode("zoom out"));
svg.getElementById("svg-pan-zoom-zoom-out")!.appendChild(zoomOut);
// move control to upper left corner
let matrix = svg.getElementById("svg-pan-zoom-controls")!.transform.baseVal[0].matrix;
matrix.e = 0;
matrix.f = 0;
}