gskinnerTeam/flutter-context-menu

context_menus

A package to show context menus on right-click or long-press.

http://screens.gskinner.com/shawn/0tVhpe5OY2.gif

🔨 Installation

dependencies:
  context_menus: ^1.0.2

⚙ Import

import 'package:context_menus/context_menus.dart';

🕹️ Usage

To get started, wrap a ContextMenuOverlay around your top-most view or app:

return ContextMenuOverlay(
  child: MaterialApp(...)
);

You can then use the ContextMenuRegion widget to tag sections of the Widget tree that should trigger a context menu.

/// Example hyperlink menu
return ContextMenuRegion(
  contextMenu: LinkContextMenu(url: 'http://flutter.dev'),
  child: TextButton(onPressed: () {}, child: Text("http://flutter.dev")),
),

Each ContextMenuRegion requires a contextMenu widget which will be shown on right-click or long-press.

Included in this package are a few pre-made ones which you can use as templates to quickly build your own.

• LinkContextMenu
• TextContextMenu
• GenericContextMenu

✨ ️Styling

You have three options to modify styling

• pass in custom ContextMenuButtonStyle for small styling tweaks
• use your own cardBuilder or buttonBuilder delegate for more control
• pass your own custom menus for total control

For basic styling, just pass button styling values to the ContextMenuOverlay:

return ContextMenuOverlay(
    buttonStyle: ContextMenuButtonStyle(
      fgColor: Colors.green,
      bgColor: Colors.red.shade100,
      hoverBgColor: Colors.red.shade200,
    ),
    child: MaterialApp(...);
}

For more control, you can overide the cardBuilder and buttonBuilder delegates:

return ContextMenuOverlay(
  /// Make a custom background
  cardBuilder: (_, children) => Container(color: Colors.purple.shade100, child: Column(children: children)),
  /// Make custom buttons
  buttonBuilder: (_, config, [__]) => TextButton(
    onPressed: config.onPressed,
    child: Container(width: double.infinity, child: Text(config.label)),
  ),
  child: MaterialApp( ... ),
);

Finally, you can disregard all of this and just provide your own menus directly to the ContextMenuRegion:

ContextMenuRegion(
  contextMenu: MyCustomMenu(),
  child: ...,
),

In this case, you are responsible for closing the menu when your buttons are triggered, which you can do using an extension on BuildContext:

context.contextMenuOverlay.hide();

💡 Custom Menus

The easiest way to create a custom menu is to use the GenericContextMenu. Just pass it a list of ContextMenuButtonConfig instances:

/// Custom Context Menu for an Image
ContextMenuRegion(
  contextMenu: GenericContextMenu(
    buttonConfigs: [
      ContextMenuButtonConfig(
        "View image in browser",
        onPressed: () => launch(_testImageUrl),
      ),
      ContextMenuButtonConfig(
        "Copy image path",
        onPressed: () => Clipboard.setData(ClipboardData(text: _testImageUrl)),
      )
    ],
  ),
  child: Image.network(_testImageUrl),
),

Another easy way to create custom menus is to use the ContextMenuStateMixin, and then call the cardBuilder and buttonBuilder methods to create your commands.

You can see this in action with the existing LinkContextMenu:

class _LinkContextMenuState extends State<LinkContextMenu> with ContextMenuStateMixin {
  @override
  Widget build(BuildContext context) {
    // cardBuilder is provided to us by the mixin, pass it a list of children to layout
    return cardBuilder.call(
      context,
      [
        // buttonBuilder is also provided by the mixin, use it to build each btn
        buttonBuilder.call(
          context,
          // button builder needs a config, so it knows how to setup the btn
          ContextMenuButtonConfig(
            "Open link in new window",
            icon: widget.useIcons ? Icon(Icons.link, size: 18) : null,
            onPressed: () => handlePressed(context, _handleNewWindowPressed),
          ),
        ),
        buttonBuilder.call(
          context,
          ContextMenuButtonConfig(
            "Copy link address",
            icon: widget.useIcons ? Icon(Icons.copy, size: 18) : null,
            onPressed: () => handlePressed(context, _handleClipboardPressed),
          ),
        )
      ],
    );
  }

In the above example, you could provide your own Card and Buttons directly, rather than using the builders, but the builders give you a couple of advantages:

• You can style all menus using the button and card builders on the ContextMenuOverlay
• All buttons will auto-close the context menu when triggered, saving you some boilerplate
• Your custom menus will match the existing set of menus

🐞 Bugs/Requests

If you encounter any problems please open an issue. If you feel the library is missing a feature, please raise a ticket on Github and we'll look into it. Pull request are welcome.

📃 License

MIT License