/
search-in-workspace-input.tsx
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/
search-in-workspace-input.tsx
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// *****************************************************************************
// Copyright (C) 2021 Ericsson and others.
//
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License v. 2.0 which is available at
// http://www.eclipse.org/legal/epl-2.0.
//
// This Source Code may also be made available under the following Secondary
// Licenses when the conditions for such availability set forth in the Eclipse
// Public License v. 2.0 are satisfied: GNU General Public License, version 2
// with the GNU Classpath Exception which is available at
// https://www.gnu.org/software/classpath/license.html.
//
// SPDX-License-Identifier: EPL-2.0 OR GPL-2.0-only WITH Classpath-exception-2.0
// *****************************************************************************
import * as React from '@theia/core/shared/react';
import { Key, KeyCode } from '@theia/core/lib/browser';
import debounce = require('@theia/core/shared/lodash.debounce');
interface HistoryState {
history: string[];
index: number;
};
type InputAttributes = React.InputHTMLAttributes<HTMLInputElement>;
export class SearchInWorkspaceInput extends React.Component<InputAttributes, HistoryState> {
static LIMIT = 100;
private input = React.createRef<HTMLInputElement>();
constructor(props: InputAttributes) {
super(props);
this.state = {
history: [],
index: 0,
};
}
updateState(index: number, history?: string[]): void {
this.value = history ? history[index] : this.state.history[index];
this.setState(prevState => {
const newState = {
...prevState,
index,
};
if (history) {
newState.history = history;
}
return newState;
});
}
get value(): string {
return this.input.current?.value ?? '';
}
set value(value: string) {
if (this.input.current) {
this.input.current.value = value;
}
}
/**
* Handle history navigation without overriding the parent's onKeyDown handler, if any.
*/
protected readonly onKeyDown = (e: React.KeyboardEvent<HTMLInputElement>): void => {
if (Key.ARROW_UP.keyCode === KeyCode.createKeyCode(e.nativeEvent).key?.keyCode) {
e.preventDefault();
this.previousValue();
} else if (Key.ARROW_DOWN.keyCode === KeyCode.createKeyCode(e.nativeEvent).key?.keyCode) {
e.preventDefault();
this.nextValue();
}
this.props.onKeyDown?.(e);
};
/**
* Switch the input's text to the previous value, if any.
*/
previousValue(): void {
const { history, index } = this.state;
if (!this.value) {
this.value = history[index];
} else if (index > 0 && index < history.length) {
this.updateState(index - 1);
}
}
/**
* Switch the input's text to the next value, if any.
*/
nextValue(): void {
const { history, index } = this.state;
if (index === history.length - 1) {
this.value = '';
} else if (!this.value) {
this.value = history[index];
} else if (index >= 0 && index < history.length - 1) {
this.updateState(index + 1);
}
}
/**
* Handle history collection without overriding the parent's onChange handler, if any.
*/
protected readonly onChange = (e: React.ChangeEvent<HTMLInputElement>): void => {
this.addToHistory();
this.props.onChange?.(e);
};
/**
* Add a nonempty current value to the history, if not already present. (Debounced, 1 second delay.)
*/
readonly addToHistory = debounce(this.doAddToHistory, 1000);
private doAddToHistory(): void {
if (!this.value) {
return;
}
const history = this.state.history
.filter(term => term !== this.value)
.concat(this.value)
.slice(-SearchInWorkspaceInput.LIMIT);
this.updateState(history.length - 1, history);
}
override render(): React.ReactNode {
return (
<input
{...this.props}
onKeyDown={this.onKeyDown}
onChange={this.onChange}
spellCheck={false}
ref={this.input}
/>
);
}
}