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const container = Z.by_id('container');
function getRandomColor() {
var letters = '0123456789ABCDEF';
var color = '#';
for (var i = 0; i < 6; i++) {
color += letters[Math.floor(Math.random() * 16)];
}
return color;
}
for (let i = 0; i < 10000; ++i) {
container.appendChild(Z.native('div', {
innerText: i,
className: 'image',
style: {
background: getRandomColor(),
aspectRatio: '1 / ' + (Math.random() + 0.5),
},
}));
}
const zoom = new (class {
constructor() {
this.committed = 5;
this.count = 5;
container.style.gridTemplateColumns = `repeat(5, 1fr)`;
container.classList.toggle('tiling', this.count != 1);
this.por = { x: 0, y: 0 };
this.eor = null;
this.y_offset = 0;
}
update(delta, point) {
this.count += delta;
this.count = Math.min(Math.max(this.count, 1), 20);
const scale = this.committed / this.count;
const x = point.x - this.por.x;
container.style.transform = `translate(${x}px, 0px) scale(${scale})`;
}
set point_of_reference(point) {
const rect = container.getClientRects()[0];
this.por = { x: point.x, y: point.y - rect.y };
container.style.transformOrigin = `${this.por.x}px ${this.por.y}px`;
this.eor = Z.document.shadowRoot.elementFromPoint(point.x, point.y);
this.y_offset = this.eor.getBoundingClientRect().y;
}
commit() {
console.log('commit');
this.count = Math.round(this.count);
container.style.gridTemplateColumns = `repeat(${this.count}, 1fr)`;
container.classList.toggle('tiling', this.count != 1);
container.style.transform = 'scale(1)';
this.committed = this.count;
void container.offsetHeight;
const rect = this.eor.getBoundingClientRect();
Z.document.scrollBy({
top: rect.y - this.y_offset,
behavior: 'instant',
});
}
});
Z.document.onwheel = (event) => {
if (!event.ctrlKey) {
return;
}
event.preventDefault();
zoom.update(event.wheelDeltaY / 120, { x: 0, y: 0 });
zoom.commit();
};
const pinch = new Pinch(Z.document);
pinch.onstart = (event) => {
zoom.point_of_reference = event.point;
};
pinch.onpinch = (event) => {
zoom.update(event.zoom_delta / 20, event.point);
};
pinch.onfinish = () => {
zoom.commit();
};
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