@launchmenu/core
Version:
An environment for visual keyboard controlled applets
65 lines • 3.75 kB
JavaScript
;
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.Content = void 0;
const react_1 = __importDefault(require("react"));
const model_react_1 = require("model-react");
/**
* A standard content class to handle keyboard scrolling concerns
*/
class Content {
/**
* Creates a new content instance
* @param view The content to be shown
*/
constructor(view = react_1.default.createElement(react_1.default.Fragment, null)) {
this.scrollPercentage = new model_react_1.Field(0);
this.scrollHeight = new model_react_1.Field(0);
this.view = view;
}
/**
* Sets the number of pixels that can be scrolled
* @param height The available height that can be scrolled (difference between container and child height)
*/
setScrollHeight(height) {
this.scrollHeight.set(height);
}
/**
* Retrieves the scroll height
* @param hook The hook to subscribe to changes
* @returns The scroll height
*/
getScrollHeight(hook) {
return this.scrollHeight.get(hook);
}
/**
* Sets the percentage of the area scrolled so far (between 0 and 1)
* @param percentage The new scroll percentage
*/
setScrollPercentage(percentage) {
this.scrollPercentage.set(Math.max(0, Math.min(percentage, 1)));
}
/**
* Retrieves the percentage of the area scrolled so far (between 0 and 1)
* @param hook The hook to subscribe to changes
* @returns The scroll percentage
*/
getScrollPercentage(hook) {
return this.scrollPercentage.get(hook);
}
/**
* Retrieves the number of pixels scrolled so far
* @param scrollHeight The available height to scroll (defaults to the amount set on this content)
* @param hook The hook to subscribe to changes
* @returns The total scroll offset
*/
getScrollOffset(scrollHeight, hook) {
if (scrollHeight === undefined)
scrollHeight = this.getScrollHeight(hook);
return this.getScrollPercentage(hook) * scrollHeight;
}
}
exports.Content = Content;
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