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feat: animation depending on timeout

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Arnošt Pleskot 2023-09-13 14:54:39 +02:00
parent b99bf74c3d
commit dd9bde5ee7
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2 changed files with 126 additions and 76 deletions
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63
src/scene/scrollConstraints.ts
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@ -286,9 +286,9 @@ const constrainScrollValues = ({
* @param state - The application state containing scroll, zoom, and constraint information.
* @returns True if the viewport is outside the constrained area; otherwise undefined.
*/
export const isViewportOutsideOfConstrainedArea = (state: AppState) => {
const isViewportOutsideOfConstrainedArea = (state: AppState) => {
if (!state.scrollConstraints) {
return;
return false;
}
const { scrollX, scrollY, width, height, scrollConstraints } = state;
@ -307,19 +307,21 @@ export const isViewportOutsideOfConstrainedArea = (state: AppState) => {
* @param state - The original AppState with the current scroll position, dimensions, and constraints.
* @returns A new AppState object with scroll values constrained as per the defined constraints.
*/
export const constrainScrollState = (state: AppState): AppState => {
export const constrainScrollState = (
state: AppState,
): {
state: AppState;
shouldAnimate: boolean;
animateTo: {
scrollX: AppState["scrollX"];
scrollY: AppState["scrollY"];
zoom: AppState["zoom"];
} | null;
} => {
if (!state.scrollConstraints || state.scrollConstraints.isAnimating) {
return state;
return { state, shouldAnimate: false, animateTo: null };
}
const {
scrollX,
scrollY,
width,
height,
scrollConstraints,
zoom,
cursorButton,
} = state;
const { scrollX, scrollY, width, height, scrollConstraints, zoom } = state;
const constrainedValues = constrainScrollValues({
...calculateConstraints({
@ -327,22 +329,41 @@ export const constrainScrollState = (state: AppState): AppState => {
width,
height,
zoom,
cursorButton,
cursorButton: "down",
}),
scrollX,
scrollY,
});
const isStateChanged =
constrainedValues.scrollX !== scrollX ||
constrainedValues.scrollY !== scrollY;
const shouldAnimate = isViewportOutsideOfConstrainedArea(state);
if (isStateChanged) {
const animateTo = shouldAnimate
? constrainScrollValues({
...calculateConstraints({
scrollConstraints,
width,
height,
zoom,
cursorButton: "up",
}),
scrollX,
scrollY,
})
: null;
if (
constrainedValues.scrollX !== scrollX ||
constrainedValues.scrollY !== scrollY
) {
return {
...state,
...constrainedValues,
state: {
...state,
...constrainedValues,
},
shouldAnimate,
animateTo,
};
}
return state;
return { state, shouldAnimate, animateTo };
};