mirror of
https://git.selfprivacy.org/kherel/selfprivacy.org.app.git
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132 lines
4.9 KiB
Dart
132 lines
4.9 KiB
Dart
// Copyright 2013 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'package:flutter/material.dart';
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const Set<TargetPlatform> _desktop = <TargetPlatform>{
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TargetPlatform.linux,
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TargetPlatform.macOS,
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TargetPlatform.windows,
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};
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const Set<TargetPlatform> _mobile = <TargetPlatform>{
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TargetPlatform.android,
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TargetPlatform.fuchsia,
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TargetPlatform.iOS,
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};
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/// A group of standard breakpoints built according to the material
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/// specifications for screen width size.
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///
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/// See also:
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///
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/// * [AdaptiveScaffold], which uses some of these Breakpoints as defaults.
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class Breakpoints {
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/// This is a standard breakpoint that can be used as a fallthrough in the
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/// case that no other breakpoint is active.
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///
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/// It is active from a width of -1 dp to infinity.
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static const Breakpoint standard = WidthPlatformBreakpoint(begin: -1);
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/// A window whose width is less than 600 dp and greater than 0 dp.
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static const Breakpoint small = WidthPlatformBreakpoint(begin: 0, end: 600);
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/// A window whose width is greater than 0 dp.
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static const Breakpoint smallAndUp = WidthPlatformBreakpoint(begin: 0);
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/// A desktop screen whose width is less than 600 dp and greater than 0 dp.
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static const Breakpoint smallDesktop =
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WidthPlatformBreakpoint(begin: 0, end: 600, platform: _desktop);
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/// A mobile screen whose width is less than 600 dp and greater than 0 dp.
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static const Breakpoint smallMobile =
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WidthPlatformBreakpoint(begin: 0, end: 600, platform: _mobile);
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/// A window whose width is between 600 dp and 840 dp.
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static const Breakpoint medium =
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WidthPlatformBreakpoint(begin: 600, end: 840);
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/// A window whose width is greater than 600 dp.
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static const Breakpoint mediumAndUp = WidthPlatformBreakpoint(begin: 600);
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/// A desktop window whose width is between 600 dp and 840 dp.
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static const Breakpoint mediumDesktop =
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WidthPlatformBreakpoint(begin: 600, end: 840, platform: _desktop);
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/// A mobile window whose width is between 600 dp and 840 dp.
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static const Breakpoint mediumMobile =
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WidthPlatformBreakpoint(begin: 600, end: 840, platform: _mobile);
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/// A window whose width is greater than 840 dp.
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static const Breakpoint large = WidthPlatformBreakpoint(begin: 840);
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/// A desktop window whose width is greater than 840 dp.
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static const Breakpoint largeDesktop =
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WidthPlatformBreakpoint(begin: 840, platform: _desktop);
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/// A mobile window whose width is greater than 840 dp.
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static const Breakpoint largeMobile =
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WidthPlatformBreakpoint(begin: 840, platform: _mobile);
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}
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/// A class that can be used to quickly generate [Breakpoint]s that depend on
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/// the screen width and the platform.
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class WidthPlatformBreakpoint extends Breakpoint {
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/// Returns a const [Breakpoint] with the given constraints.
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const WidthPlatformBreakpoint({this.begin, this.end, this.platform});
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/// The beginning width dp value. If left null then the [Breakpoint] will have
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/// no lower bound.
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final double? begin;
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/// The end width dp value. If left null then the [Breakpoint] will have no
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/// upper bound.
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final double? end;
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/// A Set of [TargetPlatform]s that the [Breakpoint] will be active on. If
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/// left null then it will be active on all platforms.
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final Set<TargetPlatform>? platform;
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@override
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bool isActive(final BuildContext context) {
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final TargetPlatform host = Theme.of(context).platform;
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final bool isRightPlatform = platform?.contains(host) ?? true;
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// Null boundaries are unbounded, assign the max/min of their associated
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// direction on a number line.
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final double width = MediaQuery.of(context).size.width;
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final double lowerBound = begin ?? double.negativeInfinity;
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final double upperBound = end ?? double.infinity;
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return width >= lowerBound && width < upperBound && isRightPlatform;
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}
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}
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/// An interface to define the conditions that distinguish between types of
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/// screens.
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///
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/// Adaptive apps usually display differently depending on the screen type: a
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/// compact layout for smaller screens, or a relaxed layout for larger screens.
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/// Override this class by defining `isActive` to fetch the screen property
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/// (usually `MediaQuery.of`) and return true if the condition is met.
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///
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/// Breakpoints do not need to be exclusive because they are tested in order
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/// with the last Breakpoint active taking priority.
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///
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/// If the condition is only based on the screen width and/or the device type,
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/// use [WidthPlatformBreakpoint] to define the [Breakpoint].
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///
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/// See also:
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///
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/// * [SlotLayout.config], which uses breakpoints to dictate the layout of the
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/// screen.
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abstract class Breakpoint {
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/// Returns a const [Breakpoint].
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const Breakpoint();
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/// A method that returns true based on conditions related to the context of
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/// the screen such as MediaQuery.of(context).size.width.
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bool isActive(final BuildContext context);
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}
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