pull_down_button 0.6.3

A package that implements Pull-Down Button from iOS 14 in Flutter. Highly customizable.

Pull-Down Button from iOS 14 for Flutter

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

---

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

Flutter availability:

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
  • PullDownMenuItem.selectable
  • PullDownMenuActionsRow
  • PullDownMenuDivider
  • PullDownMenuTitle
• showPullDownMenu
• 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: () {},
    ),
    const PullDownMenuDivider(),
    PullDownMenuItem(
      title: 'Menu item 2',
      onTap: () {},
    ),
  ],
  position: PullDownMenuPosition.under,
  buttonBuilder: (context, showMenu) => CupertinoButton(
    onPressed: showMenu,
    padding: EdgeInsets.zero,
    child: const Icon(CupertinoIcons.ellipsis_circle),
  ),
);

Properties table

Properties	Description
itemBuilder	Called when the button is pressed to create the items to show in the menu.
buttonBuilder	Builder that provides BuildContext as well as showMenu function to pass to any custom button widget.
onCanceled	Called when the user dismisses the pull-down menu.
offset	The offset is applied relative to the initial position set by the position.
position	Whether the popup menu is positioned above, over or under the popup menu button.
itemsOrder	Whether the popup menu orders its items from itemBuilder in downwards or upwards way.
routeTheme	The theme of pull-down menu box.
applyOpacity	Whether to apply opacity on buttonBuilder when menu is open.

PullDownMenuPosition

The way PullDownButton positions its pull-down menu.

Available options:

• over - menu is positioned over an anchor. Will attempt to fill as much space as possible;
• under - menu is positioned under an anchor and is forced to be under an anchor;
• above - menu is positioned above an anchor and is forced to always be above an anchor;
• automatic - menu is positioned under or above an anchor depending on side that has more space available.

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PullDownMenuItem

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

PullDownMenuItem(
  title: 'Add to favourites',
  onTap: () {},
  icon: CupertinoIcons.star,
),

Properties table

Properties	Description
onTap	Called when the menu item is tapped.
enabled	Whether the user is permitted to tap this item.
title	Title of this PullDownMenuItem.
icon	Trailing icon of this PullDownMenuItem.
iconColor	Trailing icon's color.
iconWidget	Custom trailing widget.
isDestructive	Whether this item represents destructive action.
itemTheme	The theme of menu item.

---

PullDownMenuItem.selectable

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

PullDownMenuItem.selectable(
  title: 'Order by size',
  selected: true,
  onTap: () {},
  icon: CupertinoIcons.chevron_down,
),

Note:

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

Properties table

PullDownMenuItem.selectable uses all of PullDownMenuItem properties as well as a boolean value selected, to indicate whether menu item is selected or not.

---

PullDownMenuActionsRow

PullDownMenuActionsRow is a widget used to create cupertino style pull-down menu row of actions (small or medium size).

PullDownMenuActionsRow.medium(
  items: [
    PullDownMenuItem(
      enabled: false,
      onTap: () {},
      title: 'Inbox',
      icon: CupertinoIcons.tray_arrow_down,
    ),
    PullDownMenuItem(
      onTap: () {},
      title: 'Archive',
      icon: CupertinoIcons.archivebox,
    ),
    PullDownMenuItem(
      onTap: () {},
      title: 'Trash',
      isDestructive: true,
      icon: CupertinoIcons.delete,
    ),
  ],
),

PullDownMenuItem is used to populate PullDownMenuActionsRow.items. Depending on PullDownMenuActionsRow size might be either icon only or icon and title in vertical array

Properties	Description
items	List of PullDownMenuItem.
dividerColor	Color of vertical dividers used to split item.

---

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: () {},
  ),
  PullDownMenuItem(
    title: 'Menu item 2',
    onTap: () {},
  ),
]),

---

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')),

Properties	Description
title	Title widget.
titleStyle	Title widget text style.

---

showPullDownMenu

An alternative way of displaying pull-down menu via a function call.

onPressed: () async {
  /* get tap position and / or do something before opening menu */

  await showPullDownMenu(
    context: context,
    items: [...],
    position: position,
  );
}

Properties table

Properties	Description
context	For looking up Navigator for menu.
items	List of PullDownMenuEntry widgets.
position	The RelativeRect used to align top of the menu with top of the position rectangle.
buttonSize	Used to let menu know about additional bottom offset to use while calculating final menu's position.
menuPosition	Whether the popup menu is positioned above, over or under the calculated menu's position.
itemsOrder	Whether the popup menu orders its items from itemBuilder in downwards or upwards way.
onCanceled	Called when the user dismisses the pull-down menu.
routeTheme	The theme of pull-down menu box.

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Theming

This package also provides additional customisation. By default, iOS16 theme is used, but it is also possible to override defaults with widget properties (see above) or with PullDownButtonTheme theme extension.

Default theme

Light Theme	Dark Theme

PullDownButtonTheme

To use PullDownButtonTheme define it in your ThemeData as follows:

ThemeData(
  ...,
  extensions: [
    PullDownButtonTheme(
      routeTheme: PullDownMenuRouteTheme(
        backgroundColor: Colors.grey,
      ),
      itemTheme: PullDownMenuItemTheme(
        iconSize: 24,
      ),
      dividerTheme: PullDownMenuDividerTheme(
        dividerColor: Colors.black,
      ),
    ),
  ],
),

PullDownButtonTheme uses a set of sub-themes (for items, dividers, menu itself etc.) to define needed theme. See below for every property each sub-theme provides.

PullDownButtonTheme

Properties	Description
routeTheme	Menu container theme (PullDownMenuRouteTheme).
itemTheme	PullDownMenuItem theme (PullDownMenuItemTheme).
dividerTheme	PullDownMenuDivider theme (PullDownMenuDividerTheme).
titleTheme	PullDownMenuTitle theme (PullDownMenuTitleTheme).
applyOpacity	Whether to apply opacity on PullDownButton.buttonBuilder when menu is open.

PullDownMenuRouteTheme

Properties	Description
backgroundColor	The background color of pull-down menu.
borderRadius	The border radius of the pull-down menu.
beginShadow	The pull-down menu shadow at the moment of menu being opened.
endShadow	The pull-down menu shadow at the moment of menu being fully opened.
width	Pull-down menu width.

backgroundColor usually has opacity in range of 0.7-0.8 so that menu has blur effect. If backgroundColor's is fully opaque (opacity set to 1), no blur effect will be applied.

PullDownMenuItemTheme

Properties	Description
destructiveColor	Color for destructive action.
iconSize	Size of trailing icon.
checkmark	Checkmark icon.
checkmarkWeight	Weight of checkmark icon.
checkmarkSize	Size of checkmark icon.
textStyle	PullDownMenuItem text style.
iconActionTextStyle	PullDownMenuItem text style inside of PullDownMenuActionsRow.
onHoverColor	On hover color of PullDownMenuItem.
onHoverTextStyle	On hover text style of PullDownMenuItem.

PullDownMenuDividerTheme

Properties	Description
dividerColor	Small divider color.
largeDividerColor	Large divider color.

largeDividerColor is usually lighter than dividerColor.

PullDownMenuTitleTheme

Properties	Description
style	PullDownMenuTitle text style.

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 (generated from CupertinoColors.systemBlue with ColorScheme.fromSeed) 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.