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Description:

appkit ui element colors

appkit_ui_element_colors #
A Flutter plugin that exposes AppKit’s “UI Element Colors” to facilitate the
retrieval of standard color objects for use with windows, controls, labels, text,
selections and other content in your app.
Screenshot of example project #

Getting started #
Install this package:
flutter pub add appkit_ui_element_colors
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Then import it in your Dart code:
import 'package:appkit_ui_element_colors/appkit_ui_element_colors.dart';
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Features #
Retrieving UI element colors #
The following colors are available:

Available UI Element colors

labelColor
secondaryLabelColor
tertiaryLabelColor
quaternaryLabelColor
textColor
placeholderTextColor
selectedTextColor
textBackgroundColor
selectedTextBackgroundColor
keyboardFocusIndicatorColor
unemphasizedSelectedTextColor
unemphasizedSelectedTextBackgroundColor
linkColor
separatorColor
selectedContentBackgroundColor
unemphasizedSelectedContentBackgroundColor
selectedMenuItemTextColor
gridColor
headerTextColor
alternatingContentBackgroundColors0
alternatingContentBackgroundColors1
controlAccentColor
controlColor
controlBackgroundColor
controlTextColor
disabledControlTextColor
currentControlTint
selectedControlColor
selectedControlTextColor
alternateSelectedControlTextColor
scrubberTexturedBackground
windowBackgroundColor
windowFrameTextColor
underPageBackgroundColor
findHighlightColor
highlightColor
shadowColor

Each color can be retrieved as a Color object using the AppkitUiElementColors.getColor method:
final darkWindowBackgroundColor = await AppkitUiElementColors.getColor(
uiElementColor: UiElementColor.windowBackgroundColor,
appearance: NSAppearanceName.darkAqua,
);
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Alternatively, it can also be converted to any available NSColorSpace and retrieved as a map of requested NSColorComponents using AppkitUiElementColors.getColorComponents:
final components = await AppkitUiElementColors.getColorComponents(
uiElementColor: UiElementColor.selectedControlColor,
components: {
NSColorComponent.redComponent,
NSColorComponent.greenComponent,
NSColorComponent.blueComponent,
},
colorSpace: NSColorSpace.sRGB,
appearance: NSAppearanceName.aqua,
);

// prints "{blueComponent: 0.7450980544090271, redComponent: 1.0, greenComponent: 0.9333333373069763}"
print(components);
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Observing system color changes #
Certain events, such as the user changing their preferred accent color, can trigger system color changes. Such changes can be observed using the SystemColorObserver class. The AppkitUiElementColors class provides a global shared instance of SystemColorObserver that can be accessed as follows:
AppkitUiElementColors.systemColorObserver.stream
.listen((_) => print('System colors changed.'));
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Building widgets using UiElementColorBuilder #
The UiElementColorBuilder class provides a convenient way to build widgets that depend on UI element colors provided by appkit_ui_element_colors:
UiElementColorBuilder(
builder: (context, colorContainer) => Container(
color: colorContainer.windowBackgroundColor,
),
);
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By default, UiElementColorBuilder uses a
SharedUiElementColorContainerInstanceProvider to provide a global
shared instance of UiElementColorContainer.
SharedUiElementColorContainerInstanceProvider uses an instance of
MediaQueryData derived from the current BuildContext and assumes it to
be the same across all UiElementBuilders which use it.
If your app contains surfaces with different MediaQueryData overrides,
use OwnedUiElementColorContainerInstanceProvider instead:
// A dark cupertino theme.
CupertinoTheme(
data: const CupertinoThemeData(
brightness: Brightness.dark,
),
// Override the MediaQueryData so that platformBrightness is dark.
child: MediaQuery(
data: MediaQuery.of(context).copyWith(
platformBrightness: Brightness.dark,
),
child: UiElementColorBuilder(
// Since there may be surfaces within the app that do not override the
// brightness, use an OwnedUiElementColorContainerInstanceProvider.
uiElementColorContainerInstanceProvider:
OwnedUiElementColorContainerInstanceProvider(),
builder: (context, colorContainer) => Container(
color: colorContainer.windowBackgroundColor,
),
),
),
);
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Incorrect usage of SharedUiElementColorContainerInstanceProvider throws the following assertion error:
“Found conflicting MediaQueryData in SharedUiElementColorContainerInstanceProvider. If you are using UiElementColorBuilder within widget subtrees with differing MediaQueryData (such as different theme brightness or accessibility settings), please use OwnedUiElementColorContainerInstanceProvider instead.”