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Center on last step in proof tree

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Arne Keller 2021-09-07 09:47:31 +02:00
parent 78bb732541
commit db48c7ffa0
1 changed files with 131 additions and 115 deletions
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30
frontend/src/mathjax-proof-tree.ts
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@ -129,8 +129,18 @@ class MathjaxProofTree extends MathjaxAdapter {
}
}
// limit start zoom
svg.viewBox.baseVal.width = Math.min(100000, svg.viewBox.baseVal.width);
svg.viewBox.baseVal.width = Math.min(50000, svg.viewBox.baseVal.width);
svg.viewBox.baseVal.width = Math.max(20000, svg.viewBox.baseVal.width);
// center on first visible element
const finalConclusion = svg
.querySelector<SVGGraphicsElement>("#typicalc-prooftree > g[semantics='bspr_inferenceRule:down']")!
.children[1]! as SVGGraphicsElement;
const conclusionBBox = finalConclusion.getBBox();
const mainGroupElement = svg.children[1]! as SVGGraphicsElement;
const currentX = conclusionBBox.x + conclusionBBox.width / 2;
const desiredX = svg.viewBox.baseVal.width / 2;
mainGroupElement.setAttribute("transform",
mainGroupElement.getAttribute("transform") + " translate(" + (desiredX - currentX) + " 0)");
// MathJax layout of bussproofs is sometimes wrong:
// https://github.com/mathjax/MathJax/issues/2270
@ -238,10 +248,18 @@ class MathjaxProofTree extends MathjaxAdapter {
}
console.timeEnd('stepCalculation');
const thisShadowRoot = this.shadowRoot!;
// should not be used on empty SVGs
// svg-pan-zoom should not be used on empty SVGs
if (nodeIterator.length >= 3) {
// a timeout is required, otherwise the proof tree is moved around
setTimeout(() => {
this.setupPanZoom(this.shadowRoot!, svg);
}, 100);
}
this.steps = steps;
this.showStep(0);
}
private setupPanZoom(thisShadowRoot: ShadowRoot, svg: SVGElement) {
window.svgPanZoomFun(svg, {
fit: false,
controlIconsEnabled: true,
@ -340,6 +358,7 @@ class MathjaxProofTree extends MathjaxAdapter {
matrix.e = 0;
matrix.f = 0;
// this listener destroys tooltips if the mouse is moved away from the relevant element
svg.addEventListener("mousemove", (e) => {
if (!this.hoveringOnElement || this.panningSvg) {
return;
@ -354,9 +373,6 @@ class MathjaxProofTree extends MathjaxAdapter {
}
});
}
this.steps = steps;
this.showStep(0);
}
protected calculateSteps(extraData: any): void {
const data = typeof extraData === "string" ? JSON.parse(extraData) : [];