Keybinding

Monaco Editor has a very powerful Keybinding service built in. On this basis, Molecule has transplanted the abstract class of Action2 in VSCode. Developers can implement some custom actions by inheriting this Action2 object, and they can be triggered by shortcut keys, execution commands, Command Palette and so on.

This part will elaborate on how to implement a custom Keybinding Action.

tip

All code demos in this part are based on the molecule-demo project in Quick Start.

Define Action object

First, we define the KeybindingAction object based on the Action2 abstract class:

src/extensions/action/keybindingAction.ts

import {
    Action2,
    KeybindingWeight,
} from '@dtinsight/molecule/esm/monaco/common';
import { KeyCode, KeyMod } from '@dtinsight/molecule/esm/monaco';
//@ts-ignore
import { KeyChord } from 'monaco-editor/esm/vs/base/common/keyCodes';

export class KeybindingAction extends Action2 {
    static readonly ID = 'AutoSave';

    constructor() {
        super({
            id: KeybindingAction.ID,
            precondition: undefined, // Define some precondition
            f1: false, // Not show in the Command Palette
            keybinding: {
                weight: KeybindingWeight.WorkbenchContrib,
                when: undefined,
                primary: KeyChord(KeyMod.CtrlCmd | KeyCode.KEY_S),
            },
        });
    }

    run(accessor: any, ...args: any[]) {
        alert('Save success!');
        // do something
    }
}

In the code, the keybinding field is the main part of the shortcut key. We define a Command/Ctrl + S key combination in primary, which triggers the run function to execute an alert. The id parameter is the ID of the current Action. We can use the executeCommand(actionId) method to trigger this Action actively.

Register Action

src/extensions/action/index.ts

activate(extensionCtx: IExtensionService): void {
    // Register the Action
    molecule.extension.registerAction(KeybindingAction);
    // Or
    // extensionCtx.registerAction(KeybindingAction);
}

The defined Action object needs to be registered by using the registerAction method of the ExtensionService object.

tip

The Action object also needs to be registered in the activate phase of the extension to take effect.

Actively execute Action

In addition to using Keybinding and Command Palette to trigger Action, developers can also actively trigger the execution of Actions through the executeCommand method. Take KeybindingAction as an example:

molecule.extension.executeCommand('AutoSave', args);

The complete example can refer to molecule-examples.