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Add dynamic maxZoom and wire it all up

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Signed-off-by: Šimon Brandner <simon.bra.ag@gmail.com>
This commit is contained in:
Šimon Brandner 2021-04-24 08:32:28 +02:00
parent dad7a22055
commit 4523b8c7b8
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GPG key ID: 9760693FDD98A790
1 changed files with 28 additions and 22 deletions
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50
src/components/views/elements/ImageView.tsx
View file

@ -34,8 +34,6 @@ import {RoomPermalinkCreator} from "../../../utils/permalinks/Permalinks"
import {MatrixEvent} from "matrix-js-sdk/src/models/event";
import {normalizeWheelEvent} from "../../../utils/Mouse";
const MIN_ZOOM = 100;
const MAX_ZOOM = 300;
// Max scale to keep gaps around the image
const MAX_SCALE = 0.95;
// This is used for the buttons
@ -66,6 +64,7 @@ interface IProps {
interface IState {
zoom: number,
minZoom: number,
maxZoom: number,
rotation: number,
translationX: number,
translationY: number,
@ -79,7 +78,8 @@ export default class ImageView extends React.Component<IProps, IState> {
super(props);
this.state = {
zoom: 0,
minZoom: 100,
minZoom: MAX_SCALE,
maxZoom: 100,
rotation: 0,
translationX: 0,
translationY: 0,
@ -100,11 +100,12 @@ export default class ImageView extends React.Component<IProps, IState> {
private previousY = 0;
componentDidMount() {
console.log("LOG calculating", this.props.width, this.props.height);
// We have to use addEventListener() because the listener
// needs to be passive in order to work with Chromium
this.focusLock.current.addEventListener('wheel', this.onWheel, { passive: false });
window.addEventListener("resize", this.onWindowResize);
this.calculateMinZoom();
this.calculateZoom();
}
componentWillUnmount() {
@ -112,18 +113,23 @@ export default class ImageView extends React.Component<IProps, IState> {
}
private onWindowResize = (ev) => {
this.calculateMinZoom();
this.calculateZoom();
}
private calculateMinZoom() {
// TODO: What if we don't have width and height props?
private calculateZoom() {
// TODO: What if we don't have width and height props?
const imageWrapper = document.getElementsByClassName(IMAGE_WRAPPER_CLASS)[0];
const zoomX = (imageWrapper.clientWidth / this.props.width) * 100;
const zoomY = (imageWrapper.clientHeight / this.props.height) * 100;
const zoom = Math.min(zoomX, zoomY) * MAX_SCALE;
const minZoom = Math.min(zoomX, zoomY) * MAX_SCALE;
const maxZoom = minZoom >= 100 ? minZoom : 100;
if (this.state.zoom <= this.state.minZoom) this.setState({zoom: zoom});
this.setState({minZoom: zoom});
if (this.state.zoom <= this.state.minZoom) this.setState({zoom: minZoom});
this.setState({
minZoom: minZoom,
maxZoom: maxZoom,
});
}
private onKeyDown = (ev: KeyboardEvent) => {
@ -141,16 +147,16 @@ export default class ImageView extends React.Component<IProps, IState> {
const {deltaY} = normalizeWheelEvent(ev);
const newZoom = this.state.zoom - (deltaY * ZOOM_COEFFICIENT);
if (newZoom <= MIN_ZOOM) {
if (newZoom <= this.state.minZoom) {
this.setState({
zoom: MIN_ZOOM,
zoom: this.state.minZoom,
translationX: 0,
translationY: 0,
});
return;
}
if (newZoom >= MAX_ZOOM) {
this.setState({zoom: MAX_ZOOM});
if (newZoom >= this.state.maxZoom) {
this.setState({zoom: this.state.maxZoom});
return;
}
@ -172,8 +178,8 @@ export default class ImageView extends React.Component<IProps, IState> {
};
private onZoomInClick = () => {
if (this.state.zoom >= MAX_ZOOM) {
this.setState({zoom: MAX_ZOOM});
if (this.state.zoom >= this.state.maxZoom) {
this.setState({zoom: this.state.maxZoom});
return;
}
@ -183,9 +189,9 @@ export default class ImageView extends React.Component<IProps, IState> {
};
private onZoomOutClick = () => {
if (this.state.zoom <= MIN_ZOOM) {
if (this.state.zoom <= this.state.minZoom) {
this.setState({
zoom: MIN_ZOOM,
zoom: this.state.minZoom,
translationX: 0,
translationY: 0,
});
@ -238,8 +244,8 @@ export default class ImageView extends React.Component<IProps, IState> {
if (ev.button !== 0) return;
// Zoom in if we are completely zoomed out
if (this.state.zoom === MIN_ZOOM) {
this.setState({zoom: MAX_ZOOM});
if (this.state.zoom === this.state.minZoom) {
this.setState({zoom: this.state.maxZoom});
return;
}
@ -272,7 +278,7 @@ export default class ImageView extends React.Component<IProps, IState> {
Math.abs(this.state.translationY - this.previousY) < ZOOM_DISTANCE
) {
this.setState({
zoom: MIN_ZOOM,
zoom: this.state.minZoom,
translationX: 0,
translationY: 0,
});
@ -311,7 +317,7 @@ export default class ImageView extends React.Component<IProps, IState> {
let cursor;
if (this.state.moving) {
cursor= "grabbing";
} else if (this.state.zoom === MIN_ZOOM) {
} else if (this.state.zoom === this.state.minZoom) {
cursor = "zoom-in";
} else {
cursor = "zoom-out";