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fix(zoom): Make screen edge offset document

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Zooming always leads to same backwards and forwards, even when you have
hit the screen edge. At the edge of the screen, you can move no further,
which causes the illusion of it being "sticky" on the return journey.

By adding an offset when we reach the edge, we can avoid the stickiness.

Signed-off-by: Skyler Grey <skyler.grey@collabora.com>
Change-Id: I1a2060d44d3b75935bf138056330a52d56a028ae
This commit is contained in:
Skyler Grey 2024-05-13 09:39:45 +00:00 committed by Michael Meeks
parent dbe905de8c
commit 9a73b20731
1 changed files with 26 additions and 9 deletions
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35
browser/src/layer/tile/CanvasTileLayer.js
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@ -431,10 +431,12 @@ L.TileSectionManager = L.Class.extend({
yMin = splitPos.y;
}
const documentTopLeft = new L.Point(xMin, yMin);
const minTopLeft = new L.Point(xMin, yMin);
const paneSize = paneBounds.getSize();
pinchCenter = pinchCenter.subtract(this._offset);
let centerOffset = {
x: pinchCenter.x - pinchStartCenter.x,
y: pinchCenter.y - pinchStartCenter.y,
@ -442,26 +444,39 @@ L.TileSectionManager = L.Class.extend({
// Portion of the pane away that our pinchStart (which should be where we zoom round) is
const panePortion = {
x: (pinchStartCenter.x - paneBounds.min.x) / paneSize.x,
y: (pinchStartCenter.y - paneBounds.min.y) / paneSize.y,
x: (pinchStartCenter.x - this._offset.x - paneBounds.min.x) / paneSize.x,
y: (pinchStartCenter.y - this._offset.y - paneBounds.min.y) / paneSize.y,
};
// Top left in document coordinates.
const docTopLeft = new L.Point(
Math.max(documentTopLeft.x, pinchStartCenter.x + (centerOffset.x - paneSize.x * panePortion.x) / scale),
Math.max(documentTopLeft.y, pinchStartCenter.y + (centerOffset.y - paneSize.y * panePortion.y) / scale)
let docTopLeft = new L.Point(
pinchStartCenter.x + (centerOffset.x - paneSize.x * panePortion.x) / scale,
pinchStartCenter.y + (centerOffset.y - paneSize.y * panePortion.y) / scale
);
// Top left in document coordinates.
const clampedDocTopLeft = new L.Point(
Math.max(minTopLeft.x, docTopLeft.x),
Math.max(minTopLeft.y, docTopLeft.y)
);
const offset = clampedDocTopLeft.subtract(docTopLeft);
if (freezePane.freezeX) {
docTopLeft.x = paneBounds.min.x;
} else {
this._offset.x = Math.round(Math.max(this._offset.x, offset.x));
docTopLeft.x += this._offset.x;
}
if (freezePane.freezeY) {
docTopLeft.y = paneBounds.min.y;
} else {
this._offset.y = Math.round(Math.max(this._offset.y, offset.y));
docTopLeft.y += this._offset.y;
}
if (!findFreePaneCenter) {
return { topLeft: docTopLeft };
return { offset: this._offset, topLeft: docTopLeft };
}
const newPaneCenter = new L.Point(
@ -469,7 +484,8 @@ L.TileSectionManager = L.Class.extend({
(docTopLeft.y - splitPos.y + (paneSize.y + splitPos.y) * 0.5 / scale) / app.dpiScale);
return {
topLeft: docTopLeft,
offset: this._offset,
topLeft: docTopLeft.add(this._offset),
center: this._map.project(this._map.unproject(newPaneCenter, this._map.getZoom()), this._map.getScaleZoom(scale))
};
},
@ -5078,6 +5094,7 @@ L.CanvasTileLayer = L.Layer.extend({
preZoomAnimation: function (pinchStartCenter) {
this._pinchStartCenter = this._map.project(pinchStartCenter).multiplyBy(app.dpiScale); // in core pixels
this._painter._offset = new L.Point(0, 0);
if (this.isCursorVisible()) {
this._cursorMarker.setOpacity(0);