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60 lines
2.1 KiB
Markdown
60 lines
2.1 KiB
Markdown
# Keyboard shortcuts
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## Using the `KeyBindingManager`
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The `KeyBindingManager` (accessible using `getKeyBindingManager()`) is a class
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with several methods that allow you to get a `KeyBindingAction` based on a
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`KeyboardEvent | React.KeyboardEvent`.
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The event passed to the `KeyBindingManager` gets compared to the list of
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shortcuts that are retrieved from the `IKeyBindingsProvider`s. The
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`IKeyBindingsProvider` is in `KeyBindingDefaults`.
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### Examples
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Let's say we want to close a menu when the correct keys were pressed:
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```ts
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const onKeyDown = (ev: KeyboardEvent): void => {
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let handled = true;
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const action = getKeyBindingManager().getAccessibilityAction(ev);
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switch (action) {
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case KeyBindingAction.Escape:
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closeMenu();
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break;
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default:
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handled = false;
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break;
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}
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if (handled) {
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ev.preventDefault();
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ev.stopPropagation();
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}
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};
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```
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## Managing keyboard shortcuts
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There are a few things at play when it comes to keyboard shortcuts. The
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`KeyBindingManager` gets `IKeyBindingsProvider`s one of which is
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`defaultBindingsProvider` defined in `KeyBindingDefaults`. In
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`KeyBindingDefaults` a `getBindingsByCategory()` method is used to create
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`KeyBinding`s based on `KeyboardShortcutSetting`s defined in
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`KeyboardShortcuts`.
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### Adding keyboard shortcuts
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To add a keyboard shortcut there are two files we have to look at:
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`KeyboardShortcuts.ts` and `KeyBindingDefaults.ts`. In most cases we only need
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to edit `KeyboardShortcuts.ts`: add a `KeyBindingAction` and add the
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`KeyBindingAction` to the `KEYBOARD_SHORTCUTS` object.
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Though, to make matters worse, sometimes we want to add a shortcut that has
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multiple keybindings associated with. This keyboard shortcut won't be
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customizable as it would be rather difficult to manage both from the point of
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the settings and the UI. To do this, we have to add a `KeyBindingAction` and add
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the UI representation of that keyboard shortcut to the `getUIOnlyShortcuts()`
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method. Then, we also need to add the keybinding to the correct method in
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`KeyBindingDefaults`.
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