gristlabs_grist-core/app/client/widgets/NTextEditor.ts

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/**
* This is a copy of TextEditor.js, converted to typescript.
*/
import {createGroup} from 'app/client/components/commands';
import {testId} from 'app/client/ui2018/cssVars';
import {createMobileButtons, getButtonMargins} from 'app/client/widgets/EditorButtons';
import {EditorPlacement} from 'app/client/widgets/EditorPlacement';
import {NewBaseEditor, Options} from 'app/client/widgets/NewBaseEditor';
import {CellValue} from "app/common/DocActions";
import {undef} from 'app/common/gutil';
import {dom, Observable} from 'grainjs';
export class NTextEditor extends NewBaseEditor {
// Observable with current editor state (used by drafts or latest edit/position component)
public readonly editorState: Observable<string>;
protected cellEditorDiv: HTMLElement;
protected textInput: HTMLTextAreaElement;
protected commandGroup: any;
private _dom: HTMLElement;
private _editorPlacement: EditorPlacement;
private _contentSizer: HTMLElement;
private _alignment: string;
// Note: TextEditor supports also options.placeholder for use by derived classes, but this is
// easy to apply to this.textInput without needing a separate option.
constructor(options: Options) {
super(options);
const initialValue: string = undef(
options.state as string | undefined,
options.editValue, String(options.cellValue ?? ""));
this.editorState = Observable.create<string>(this, initialValue);
this.commandGroup = this.autoDispose(createGroup(options.commands, null, true));
this._alignment = options.field.widgetOptionsJson.peek().alignment || 'left';
this._dom = dom('div.default_editor',
this.cellEditorDiv = dom('div.celleditor_cursor_editor', testId('widget-text-editor'),
this._contentSizer = dom('div.celleditor_content_measure'),
this.textInput = dom('textarea', dom.cls('celleditor_text_editor'),
dom.style('text-align', this._alignment),
dom.prop('value', initialValue),
this.commandGroup.attach(),
dom.on('input', () => this.onInput())
)
),
createMobileButtons(options.commands),
);
}
public attach(cellElem: Element): void {
// Attach the editor dom to page DOM.
this._editorPlacement = EditorPlacement.create(this, this._dom, cellElem, {margins: getButtonMargins()});
// Reposition the editor if needed for external reasons (in practice, window resize).
this.autoDispose(this._editorPlacement.onReposition.addListener(this.resizeInput, this));
this.setSizerLimits();
// Once the editor is attached to DOM, resize it to content, focus, and set cursor.
this.resizeInput();
this.textInput.focus();
const pos = Math.min(this.options.cursorPos, this.textInput.value.length);
this.textInput.setSelectionRange(pos, pos);
}
public getDom(): HTMLElement {
return this._dom;
}
public getCellValue(): CellValue {
return this.textInput.value;
}
public getTextValue() {
return this.textInput.value;
}
public getCursorPos() {
return this.textInput.selectionStart;
}
public setSizerLimits() {
// Set the max width of the sizer to the max we could possibly grow to, so that it knows to wrap
// once we reach it.
const maxSize = this._editorPlacement.calcSizeWithPadding(this.textInput,
{width: Infinity, height: Infinity}, {calcOnly: true});
this._contentSizer.style.maxWidth = Math.ceil(maxSize.width) + 'px';
}
/**
* Occurs when user types text in the textarea
*
*/
protected onInput() {
// Resize the textbox whenever user types in it.
this.resizeInput();
// notify about current state
this.editorState.set(String(this.getTextValue()));
}
/**
* Helper which resizes textInput to match its content. It relies on having a contentSizer element
* with the same font/size settings as the textInput, and on having `calcSize` helper,
* which is provided by the EditorPlacement class.
*/
protected resizeInput() {
const textInput = this.textInput;
// \u200B is a zero-width space; it is used so the textbox will expand vertically
// on newlines, but it does not add any width.
this._contentSizer.textContent = textInput.value + '\u200B';
const rect = this._contentSizer.getBoundingClientRect();
// Allow for a bit of extra space after the cursor (only desirable when text is left-aligned).
if (this._alignment === "left") {
// Modifiable in modern browsers: https://developer.mozilla.org/en-US/docs/Web/API/Element/getBoundingClientRect
rect.width += 16;
}
const size = this._editorPlacement.calcSizeWithPadding(textInput, rect);
textInput.style.width = size.width + 'px';
textInput.style.height = size.height + 'px';
}
}