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import React from 'react';
import { IScrollEvent } from './CustomScrollbars';
interface NavigationContainerProps {
children?: React.ReactNode;
}
interface NavigationContainerState {
showsBarTitle: boolean;
}
export const NavigationScrollContext = React.createContext<{
showsBarTitle: boolean;
onScroll: (event: IScrollEvent) => void;
}>({
showsBarTitle: false,
onScroll: () => {
throw new Error('NavigationScrollContext provider is missing.');
},
});
export class NavigationContainer extends React.Component<
NavigationContainerProps,
NavigationContainerState
> {
state: NavigationContainerState = {
showsBarTitle: false,
};
componentDidMount() {
this.updateBarAppearance({ scrollLeft: 0, scrollTop: 0 });
}
render() {
const { children } = this.props;
const { showsBarTitle } = this.state;
return (
<NavigationScrollContext.Provider
value={{
showsBarTitle,
onScroll: this.onScroll,
}}>
{children}
</NavigationScrollContext.Provider>
);
}
private onScroll = (event: IScrollEvent) => {
this.updateBarAppearance(event);
};
private updateBarAppearance = ({ scrollTop }: IScrollEvent) => {
// Show the bar title when user scrolls past page title
const showsBarTitle = scrollTop > 20;
if (this.state.showsBarTitle !== showsBarTitle) {
this.setState({ showsBarTitle });
}
};
}
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