AssetPickerBuilderDelegate<Asset, Path> class abstract

The delegate to build the whole picker's components.

By extending the delegate, you can customize every components on you own. Delegate requires two generic types:

• Asset The type of your assets. Defaults to AssetEntity.
• Path The type of your paths. Defaults to AssetPathEntity.

Implementers

• DefaultAssetPickerBuilderDelegate

Constructors

AssetPickerBuilderDelegate({required AssetPickerProvider<Asset, Path> provider, required PermissionState initialPermission, int gridCount = 4, Color? themeColor, AssetsPickerTextDelegate? textDelegate, ThemeData? pickerTheme, SpecialItemPosition specialItemPosition = SpecialItemPosition.none, WidgetBuilder? specialItemBuilder, IndicatorBuilder? loadingIndicatorBuilder, bool allowSpecialItemWhenEmpty = false, bool keepScrollOffset = false, AssetSelectPredicate<Asset>? selectPredicate, bool? shouldRevertGrid})

Properties

allowSpecialItemWhenEmpty → bool

Whether the special item will display or not when assets is empty. 当没有资源时是否显示自定义item

final

appBarItemHeight → double

Item's height in app bar. 顶栏内各个组件的统一高度

no setter

appleOSBlurRadius → double

Blur radius in Apple OS layout mode. 苹果系列系统布局方式下的模糊度

no setter

bottomActionBarHeight → double

Height for bottom action bar. 底部操作栏的高度

no setter

bottomSectionHeight → double

Height for the bottom occupied section. 底部区域占用的高度

no setter

effectiveShouldRevertGrid → bool

no setter

gridCount → int

Assets count for the picker. 资源网格数

final

gridRevertKey → GlobalKey<State<StatefulWidget>>

The GlobalKey for assetsGridBuilder to locate the ScrollView.center. assetsGridBuilder 用于定位 ScrollView.center 的 GlobalKey

final

gridScrollController → ScrollController

The ScrollController for the preview grid.

final

hashCode → int

The hash code for this object.

no setter, inherited

initialPermission → PermissionState

The PermissionState when the picker is called. 当选择器被拉起时的权限状态

final

isAppleOS → bool

Whether the current platform is Apple OS. 当前平台是否苹果系列系统 (iOS & MacOS)

no setter

isPermissionLimited → bool

Whether the permission is limited currently. 当前的权限是否为受限

no setter

isSingleAssetMode → bool

Whether the picker is under the single asset mode. 选择器是否为单选模式

no setter

itemSpacing → double

Space between assets item widget. 资源部件之间的间隔

no setter

keepScrollOffset → bool

Whether the picker should save the scroll offset between pushes and pops. 选择器是否可以从同样的位置开始选择

final

loadingIndicatorBuilder → IndicatorBuilder?

Indicates the loading status for the builder. 指示目前加载的状态

final

overlayStyle → SystemUiOverlayStyle

Return a system ui overlay style according to the brightness of the theme data. 根据主题返回状态栏的明暗样式

no setter

permission → ValueNotifier<PermissionState>

Notifier for the current PermissionState. 当前 PermissionState 的监听

late, final

permissionLimitedBarHeight → double

Height for the permission limited bar. 权限受限栏的高度

no setter

permissionOverlayHidden → ValueNotifier<bool>

final

pickerTheme → ThemeData?

Theme for the picker. 选择器的主题

final

provider → AssetPickerProvider<Asset, Path>

ChangeNotifier for asset picker. 资源选择器状态保持

final

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

selectPredicate → AssetSelectPredicate<Asset>?

Predicate whether an asset can be selected or unselected. 判断资源可否被选择

final

shouldRevertGrid → bool?

Whether the assets grid should revert. 判断资源网格是否需要倒序排列

final

specialItemBuilder → WidgetBuilder?

The widget builder for the the special item. 自定义item的构造方法

final

specialItemPosition → SpecialItemPosition

Allow users set a special item in the picker with several positions. 允许用户在选择器中添加一个自定义item，并指定位置

final

theme → ThemeData

ThemeData for the picker. 选择器使用的主题

no setter

themeColor → Color

Main color for the picker. 选择器的主题色

final

Methods

accessLimitedBottomTip(BuildContext context) → Widget

The tip widget displays when the access is limited. 当访问受限时在底部展示的提示

androidLayout(BuildContext context) → Widget

Layout for Android devices. Android设备的选择器布局

appBar(BuildContext context) → PreferredSizeWidget

Custom app bar for the picker. 选择器自定义的顶栏

appleOSLayout(BuildContext context) → Widget

Layout for Apple OS devices. 苹果系列设备的选择器布局

assetGridItemBuilder(BuildContext context, int index, List<Asset> currentAssets) → Widget

The item builder for the assets' grid. 资源列表项的构建

assetsGridBuilder(BuildContext context) → Widget

The main grid view builder for assets. 主要的资源查看网格部件

assetsGridItemCount({required BuildContext context, required List<Asset> assets, int placeholderCount = 0}) → int

The function which return items count for the assets' grid. 为资源列表提供内容数量计算的方法

audioIndicator(BuildContext context, Asset asset) → Widget

Audio asset type indicator. 音频类型资源指示

audioItemBuilder(BuildContext context, int index, Asset asset) → Widget

The item builder for audio type of asset. 音频资源的部件构建

backButton(BuildContext context) → Widget

Back button. 返回按钮

bottomActionBar(BuildContext context) → Widget

Action bar widget aligned to bottom. 底部操作栏部件

build(BuildContext context) → Widget

Yes, the build method. 没错，是它是它就是它，我们亲爱的 build 方法~

confirmButton(BuildContext context) → Widget

Confirm button. 确认按钮

dispose() → void

Keep a dispose method to sync with State. 保留一个 dispose 方法与 State 同步。

effectiveGridDirection(BuildContext context) → TextDirection

The effective direction for the assets grid. 网格实际的方向

failedItemBuilder(BuildContext context) → Widget

Item widgets when the thumb data load failed. 资源缩略数据加载失败时使用的部件

findChildIndexBuilder({required String id, required List<Asset> assets, int placeholderCount = 0}) → int?

Indicates how would the grid found a reusable RenderObject through id. 为 Grid 布局指示如何找到可复用的 RenderObject。

gifIndicator(BuildContext context, Asset asset) → Widget

GIF image type indicator. GIF 类型图片指示

imageAndVideoItemBuilder(BuildContext context, int index, Asset asset) → Widget

The item builder for images and video type of asset. 图片和视频资源的部件构建

interactiveTextColor(BuildContext context) → Color

The color for interactive texts. 可交互的文字的颜色

iOSPermissionOverlay(BuildContext context) → Widget

The overlay when the permission is limited on iOS.

itemBannedIndicator(BuildContext context, Asset asset) → Widget

Indicator when the asset cannot be selected. 当资源无法被选中时的遮罩

keepScrollOffsetListener() → void

The listener to track the scroll position of the gridScrollController if keepScrollOffset is true. 当 keepScrollOffset 为 true 时，跟踪 gridScrollController 位置的监听。

loadingIndicator(BuildContext context) → Widget

Loading indicator. 加载指示器

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

pathEntityListBackdrop(BuildContext context) → Widget

A backdrop widget behind the pathEntityListWidget. 在 pathEntityListWidget 后面的遮罩层

pathEntityListWidget(BuildContext context) → Widget

List widget for path entities. 路径选择列表组件

pathEntitySelector(BuildContext context) → Widget

Path entity select widget builder. 路径选择部件构建

pathEntityWidget({required BuildContext context, required Map<Path, Uint8List?> list, required int index, bool isAudio = false}) → Widget

Item widgets for path entity selector. 路径单独条目选择组件

previewButton(BuildContext context) → Widget

Preview button to preview selected assets. 预览已选资源的按钮

selectedBackdrop(BuildContext context, int index, Asset asset) → Widget

Animated backdrop widget for items. 部件选中时的动画遮罩部件

selectIndicator(BuildContext context, Asset asset) → Widget

Indicator for assets selected status. 资源是否已选的指示器

toString() → String

A string representation of this object.

inherited

videoIndicator(BuildContext context, Asset asset) → Widget

Video asset type indicator. 视频类型资源指示

Operators

operator ==(Object other) → bool

The equality operator.

inherited