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add mouse scroll lock in image expand view (#15088) 

* add mouse scroll lock in image expand view

* enhancement
This commit is contained in:
Mashiro 2020-11-03 13:06:45 +08:00 committed by GitHub
parent 6a2db10f76
commit f645dad661
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1 changed files with 21 additions and 19 deletions
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40
app/javascript/mastodon/features/ui/components/zoomable_image.js
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@ -194,11 +194,14 @@ class ZoomableImage extends React.PureComponent {
if (this.state.zoomMatrix.type === 'full-width') {
// full width, scroll vertical
this.container.scrollTop = this.container.scrollTop + event.pixelY;
this.container.scrollTop = Math.max(this.container.scrollTop + event.pixelY, this.state.lockScroll.y);
} else {
// full height, scroll horizontal
this.container.scrollLeft = this.container.scrollLeft + event.pixelY;
this.container.scrollLeft = Math.max(this.container.scrollLeft + event.pixelY, this.state.lockScroll.x);
}
// lock horizontal scroll
this.container.scrollLeft = Math.max(this.container.scrollLeft + event.pixelX, this.state.lockScroll.x);
}
mouseDownHandler = e => {
@ -221,13 +224,8 @@ class ZoomableImage extends React.PureComponent {
const dx = e.clientX - this.state.dragPosition.x;
const dy = e.clientY - this.state.dragPosition.y;
if ((this.state.dragPosition.left - dx) >= this.state.lockScroll.x) {
this.container.scrollLeft = this.state.dragPosition.left - dx;
}
if ((this.state.dragPosition.top - dy) >= this.state.lockScroll.y) {
this.container.scrollTop = this.state.dragPosition.top - dy;
}
this.container.scrollLeft = Math.max(this.state.dragPosition.left - dx, this.state.lockScroll.x);
this.container.scrollTop = Math.max(this.state.dragPosition.top - dy, this.state.lockScroll.y);
this.setState({ dragged: true });
}
@ -336,22 +334,26 @@ class ZoomableImage extends React.PureComponent {
const { scale, zoomMatrix } = this.state;
if ( scale >= zoomMatrix.rate ) {
this.setState({ scale: MIN_SCALE }, () => {
this.container.scrollLeft = 0;
this.container.scrollTop = 0;
this.setState({ lockScroll: {
this.setState({
scale: MIN_SCALE,
lockScroll: {
x: 0,
y: 0,
} });
},
}, () => {
this.container.scrollLeft = 0;
this.container.scrollTop = 0;
});
} else {
this.setState({ scale: zoomMatrix.rate }, () => {
this.container.scrollLeft = zoomMatrix.scrollLeft;
this.container.scrollTop = zoomMatrix.scrollTop;
this.setState({ lockScroll: {
this.setState({
scale: zoomMatrix.rate,
lockScroll: {
x: zoomMatrix.scrollLeft,
y: zoomMatrix.scrollTop,
} });
},
}, () => {
this.container.scrollLeft = zoomMatrix.scrollLeft;
this.container.scrollTop = zoomMatrix.scrollTop;
});
}