pull_down_button 0.1.0-beta.4.1

Cupertino styled Pull-Down Button from iOS 14 with great customisation options.

Pull-Down Button

pull_down_button is a rework of Flutter's PopupMenuButton to be styled like Pop-Up & Pull-Down Buttons from iOS 14+ with some additional customisation options.

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This package only tries to visually replicate native counterpart, some parts might be somewhat different.

Flutter availabilty:

Since this package uses new Flutter feature ThemeExtension for theming, minimum supported version is stable 3.0.0.

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Contents:

• PullDownButton
  • PullDownMenuItem
  • SelectablePullDownMenuItem
  • PullDownMenuDivider
  • PullDownMenuTitle
• Theming
  • PullDownButtonTheme
• Contributions

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PullDownButton

PullDownButton is a widget used to show pull-down menu. Unlike PopupMenuButton, PullDownButton allows better customization of button that will be used to show pull-down menu via buttonBuilder builder function.

While pull-down menu is opened, button from where this menu was called will have lower opacity.

PullDownButton(
  itemBuilder: (context) => [
    PullDownMenuItem(
      title: 'Menu item',
      onTap: () => action(),
    ),
    const PullDownMenuDivider(),
    PullDownMenuItem(
      title: 'Menu item 2',
      onTap: () => action2(),
    ),
  ],
  position: PullDownMenuPosition.under,
  buttonBuilder: (context, showMenu) => CupertinoButton(
    onPressed: showMenu,
    padding: EdgeInsets.zero,
    child: const Icon(CupertinoIcons.ellipsis_circle),
  ),
);

Parameters	Description	Value
itemBuilder	Called when the button is pressed to create the items to show in the menu.	required
buttonBuilder	Builder that provides BuildContext as well as showMenu function to pass to any custom button widget.	required
onCanceled	Called when the user dismisses the pull-down menu.	optional
offset	The offset is applied relative to the initial position set by the position.	Offset.zero
position	Whether the popup menu is positioned over or under the popup menu button.	PullDownMenuPosition.above
backgroundColor	The background color of pull-down menu.	optional

backgroundColor usually has opacity in range of 0.7-0.8 so that menu has blur effect.

PullDownMenuPosition

The way PullDownButton positions its pull-down menu.

Available options:

• over
• under
• above

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PullDownMenuItem

PullDownMenuItem is a widget used to create cupertino style pull-down menu item.

PullDownMenuItem(
  title: 'Add to favourites',
  onTap: () => action(),
  icon: CupertinoIcons.star,
),

Parameters	Description	Value
onTap	Called when the menu item is tapped.	required
enabled	Whether the user is permitted to tap this item.	true
title	Title of this PullDownMenuItem.	required
icon	Trailing icon of this PullDownMenuItem.	optional
iconColor	Trailing icon's color.	optional
iconSize	Size of trailing icon.	optional
iconWidget	Custom trailing widget.	optional
textStyle	Title text style.	optional
isDestructive	Whether this item represents destructive action.	false
destructiveColor	Color for destructive action.	optional

---

SelectablePullDownMenuItem

SelectablePullDownMenuItem is a widget used to create cupertino style pull-down menu item with selection state.

SelectablePullDownMenuItem(
  title: 'Order by size',
  selected: true,
  onTap: () => action(),
  icon: CupertinoIcons.chevron_down,
),

Note:

Based on guidelines, if menu items contains at least one tappable menu item of type SelectablePullDownMenuItem all of PullDownMenuItems should also be of type SelectablePullDownMenuItem (to insert additional padding so all items have same). Although, manual change of all PullDownMenuItems is not needed, it is done automatically.

SelectablePullDownMenuItem uses all of PullDownMenuItem parameters as well as a few SelectablePullDownMenuItem specific:

Parameters	Description	Value
selected	Whether to display a checkmark next to the menu item.	false
checkmark	Checkmark icon.	optional
checkmarkWeight	Weight of checkmark icon.	optional
checkmarkSize	Size of checkmark icon	optional

---

PullDownMenuDivider

PullDownMenuDivider is a widget used to create cupertino style pull-down menu divider (small or large).

const PullDownMenuDivider(),

or to create large divider:

const PullDownMenuDivider.large(),

There is also convenience method to wrap multiple menu items with small dividers:

...PullDownMenuDivider.wrapWithDivider([
  PullDownMenuItem(
    title: 'Menu item',
    onTap: () => action(),
  ),
  PullDownMenuItem(
    title: 'Menu item 2',
    onTap: () => action2(),
  ),
]),

Parameters	Description	Value
dividerColor	Small divider color.	optional
largeDividerColor	Large divider color.	optional

largeDividerColor is usually lighter than dividerColor.

---

PullDownMenuTitle

PullDownMenuTitle is a widget used to create cupertino style pull-down menu title (usually at the top of menu).

const PullDownMenuTitle(title: Text('Pull-down menu')),

Parameters	Description	Value
title	Title widget.	required
titleStyle	Title widget style.	optional

---

Theming

This package also provides additional customisation. By default, iOS15 theme is used, but it is also possible to override defaults with widget parameters (see above) or with PullDownButtonTheme theme extension.

Default theme

Light Theme	Dark Theme

PullDownButtonTheme

Usage

To use PullDownButtonTheme define it in your ThemeData as follows:

ThemeData(
  ...,
  extensions: [
    PullDownButtonTheme(
      backgroundColor: Colors.grey,
      iconSize: 24,
      dividerColor: Colors.black,
    ),
  ],
),

Parameters	Description	Value
backgroundColor	The background color of pull-down menu.	optional
dividerColor	Small divider color.	optional
largeDividerColor	Large divider color.	optional
destructiveColor	Color for destructive action.	optional
iconSize	Size of trailing icon.	optional
checkmark	Checkmark icon.	optional
checkmarkWeight	Weight of checkmark icon.	optional
checkmarkSize	Size of checkmark icon	optional
textStyle	Title text style.	optional
titleStyle	Title widget style.	optional

backgroundColor usually has opacity in range of 0.7-0.8 so that menu has blur effect. largeDividerColor is usually lighter than dividerColor.

PullDownButtonInheritedTheme

If defining PullDownButtonTheme in ThemeData is not possible, for example if you are using CupertinoApp, you can use PullDownButtonInheritedTheme:

CupertinoApp(
  builder: (context, child) => PullDownButtonInheritedTheme(
    data: const PullDownButtonTheme(
      ...
    ),
    child: child!,
  ),
  home: ...,
)

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Here is example of using PullDownButtonTheme with Material 3 color scheme colors & text styles from Material 3 Menu specs.

Custom Material 3 light theme	Custom Material 3 dark theme

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Contributions

Feel free to contribute to this project.

Please file feature requests and bugs at the issue tracker.

If you fixed a bug or implemented a feature by yourself, feel free to send a pull request.