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import { keyboardEnter } from './keyboardEnter';
import { keyboardInput } from './keyboardInput';
import { keyboardTab } from './keyboardTab';
import { parseTableCells } from 'roosterjs-content-model-dom';
import type { EditOptions } from './EditOptions';
import type {
DOMSelection,
EditorPlugin,
IEditor,
KeyDownEvent,
PluginEvent,
} from 'roosterjs-content-model-types';
const BACKSPACE_KEY = 8;
const DELETE_KEY = 46;
/**
* According to https://lists.w3.org/Archives/Public/www-dom/2010JulSep/att-0182/keyCode-spec.html
* 229 can be sent in variants generated when Long press (iOS) or using IM.
*
* Other cases: https://stackoverflow.com/questions/25043934/is-it-ok-to-ignore-keydown-events-with-keycode-229
*/
const DEAD_KEY = 229;
const DefaultOptions: Partial<EditOptions> = {
handleTabKey: true,
handleExpandedSelectionOnDelete: true,
};
/**
* Edit plugins helps editor to do editing operation on top of content model.
* This includes:
* 1. Delete Key
* 2. Backspace Key
* 3. Tab Key
*/
export class EditPlugin implements EditorPlugin {
private editor: IEditor | null = null;
private disposer: (() => void) | null = null;
private shouldHandleNextInputEvent = false;
private selectionAfterDelete: DOMSelection | null = null;
private handleNormalEnter: (editor: IEditor) => boolean = () => false;
/**
* @param options An optional parameter that takes in an object of type EditOptions, which includes the following properties:
* handleTabKey: A boolean that enables or disables Tab key handling. Defaults to true.
*/
constructor(private options: EditOptions = DefaultOptions) {
this.options = { ...DefaultOptions, ...options };
}
private createNormalEnterChecker(result: boolean) {
return result ? () => true : () => false;
}
private getHandleNormalEnter(editor: IEditor) {
switch (typeof this.options.shouldHandleEnterKey) {
case 'function':
return this.options.shouldHandleEnterKey;
case 'boolean':
return this.createNormalEnterChecker(this.options.shouldHandleEnterKey);
default:
return this.createNormalEnterChecker(
editor.isExperimentalFeatureEnabled('HandleEnterKey')
);
}
}
/**
* Get name of this plugin
*/
getName() {
return 'Edit';
}
/**
* The first method that editor will call to a plugin when editor is initializing.
* It will pass in the editor instance, plugin should take this chance to save the
* editor reference so that it can call to any editor method or format API later.
* @param editor The editor object
*/
initialize(editor: IEditor) {
this.editor = editor;
this.handleNormalEnter = this.getHandleNormalEnter(editor);
if (editor.getEnvironment().isAndroid) {
this.disposer = this.editor.attachDomEvent({
beforeinput: {
beforeDispatch: e => this.handleBeforeInputEvent(editor, e),
},
});
}
}
/**
* The last method that editor will call to a plugin before it is disposed.
* Plugin can take this chance to clear the reference to editor. After this method is
* called, plugin should not call to any editor method since it will result in error.
*/
dispose() {
this.editor = null;
this.disposer?.();
this.disposer = null;
}
/**
* Core method for a plugin. Once an event happens in editor, editor will call this
* method of each plugin to handle the event as long as the event is not handled
* exclusively by another plugin.
* @param event The event to handle:
*/
onPluginEvent(event: PluginEvent) {
Eif (this.editor) {
switch (event.eventType) {
case 'keyDown':
this.handleKeyDownEvent(this.editor, event);
break;
case 'keyUp':
if (this.selectionAfterDelete) {
this.editor.setDOMSelection(this.selectionAfterDelete);
this.selectionAfterDelete = null;
}
break;
}
}
}
/**
* Check if the plugin should handle the given event exclusively.
* Handle an event exclusively means other plugin will not receive this event in
* onPluginEvent method.
* If two plugins will return true in willHandleEventExclusively() for the same event,
* the final result depends on the order of the plugins are added into editor
* @param event The event to check:
*/
willHandleEventExclusively(event: PluginEvent) {
Iif (
this.editor &&
this.options.handleTabKey &&
event.eventType == 'keyDown' &&
event.rawEvent.key == 'Tab' &&
!event.rawEvent.shiftKey
) {
const selection = this.editor.getDOMSelection();
const startContainer =
selection?.type == 'range' ? selection.range.startContainer : null;
const table = startContainer
? this.editor.getDOMHelper().findClosestElementAncestor(startContainer, 'table')
: null;
const parsedTable = table && parseTableCells(table);
if (parsedTable) {
const lastRow = parsedTable[parsedTable.length - 1];
const lastCell = lastRow && lastRow[lastRow.length - 1];
if (typeof lastCell == 'object' && lastCell.contains(startContainer)) {
// When TAB in the last cell of a table, we will generate new table row, so prevent other plugins handling this event
// e.g. SelectionPlugin will move the focus out of table, which is conflict with this behavior
return true;
}
}
}
return false;
}
private handleKeyDownEvent(editor: IEditor, event: KeyDownEvent) {
const rawEvent = event.rawEvent;
const hasCtrlOrMetaKey = rawEvent.ctrlKey || rawEvent.metaKey;
if (!rawEvent.defaultPrevented && !event.handledByEditFeature) {
switch (rawEvent.key) {
case 'Backspace':
// Use our API to handle BACKSPACE/DELETE key.
// No need to clear cache here since if we rely on browser's behavior, there will be Input event and its handler will reconcile cache
if (!this.shouldBrowserHandleBackspace(editor)) {
keyboardDelete(editor, rawEvent, this.options);
}
break;
case 'Delete':
// Use our API to handle BACKSPACE/DELETE key.
// No need to clear cache here since if we rely on browser's behavior, there will be Input event and its handler will reconcile cache
// And leave it to browser when shift key is pressed so that browser will trigger cut event
if (!event.rawEvent.shiftKey) {
keyboardDelete(editor, rawEvent, this.options);
}
break;
case 'Tab':
if (this.options.handleTabKey && !hasCtrlOrMetaKey) {
keyboardTab(editor, rawEvent);
}
break;
case 'Unidentified':
Eif (editor.getEnvironment().isAndroid) {
this.shouldHandleNextInputEvent = true;
}
break;
case 'Enter':
if (
!hasCtrlOrMetaKey &&
!event.rawEvent.isComposing &&
event.rawEvent.keyCode !== DEAD_KEY
) {
keyboardEnter(
editor,
rawEvent,
this.handleNormalEnter(editor),
this.options.formatsToPreserveOnMerge
);
}
break;
default:
keyboardInput(editor, rawEvent);
break;
}
}
}
private handleBeforeInputEvent(editor: IEditor, rawEvent: Event) {
// Some Android IMEs doesn't fire correct keydown event for BACKSPACE/DELETE key
// Here we translate input event to BACKSPACE/DELETE keydown event to be compatible with existing logic
Iif (
!this.shouldHandleNextInputEvent ||
!(rawEvent instanceof InputEvent) ||
rawEvent.defaultPrevented
) {
return;
}
this.shouldHandleNextInputEvent = false;
let handled = false;
switch (rawEvent.inputType) {
case 'deleteContentBackward':
Eif (!this.shouldBrowserHandleBackspace(editor)) {
// This logic is Android specific. It's because some Android keyboard doesn't support key and keycode, the value of them is always Unidentified, so we have to manually create a new one.
handled = keyboardDelete(
editor,
new KeyboardEvent('keydown', {
key: 'Backspace',
keyCode: BACKSPACE_KEY,
which: BACKSPACE_KEY,
}),
this.options
);
}
break;
case 'deleteContentForward':
handled = keyboardDelete(
editor,
new KeyboardEvent('keydown', {
key: 'Delete',
keyCode: DELETE_KEY,
which: DELETE_KEY,
}),
this.options
);
break;
}
Iif (handled) {
rawEvent.preventDefault();
// Restore the selection on keyup event to avoid the cursor jump issue
// See: https://issues.chromium.org/issues/330596261
this.selectionAfterDelete = editor.getDOMSelection();
}
}
private shouldBrowserHandleBackspace(editor: IEditor): boolean {
const opt = this.options.shouldHandleBackspaceKey;
switch (typeof opt) {
case 'function':
return opt(editor);
case 'boolean':
return opt;
default:
return false;
}
}
}
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