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sm-mobile-20261016T185235Z-8e93ecc1b59a Idinagdag: 2026-10-16 21:29 · Binuo: 2026-10-16 20:52

adaptive.dart Idinagdag: Hindi naitala ang petsa 10.8 KB · 307 linya

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1import 'dart:math' as math;

2import 'dart:ui' show DisplayFeature, DisplayFeatureState, DisplayFeatureType;

3import 'package:flutter/material.dart';

5/// Width classes in logical pixels. Layout never depends on a device model,

6/// physical resolution or devicePixelRatio, only on the space the OS gives us.

7enum WindowClass {

8 compact,

9 medium,

10 expanded,

11 large,

12 extraLarge;

14 static const mediumMin = 600.0,

15 expandedMin = 840.0,

16 largeMin = 1200.0,

17 extraLargeMin = 1600.0;

19 static WindowClass ofWidth(double width) => width >= extraLargeMin

20 ? extraLarge

21 : width >= largeMin

22 ? large

23 : width >= expandedMin

24 ? expanded

25 : width >= mediumMin

26 ? medium

27 : compact;

29 bool operator >=(WindowClass other) => index >= other.index;

30}

32/// Below this window size the app keeps this logical canvas and scrolls it,

33/// instead of squeezing controls until they overlap or overflow.

34const minimumCanvas = Size(240, 320);

36/// A fold or hinge that splits the window into separately usable regions:

37/// a physical hinge with area, or a fold that is currently half opened.

38/// A flat fold (for example a fully open Galaxy/Pixel Fold) does not split.

39bool isSeparating(DisplayFeature f) =>

40 f.type != DisplayFeatureType.cutout &&

41 (f.bounds.shortestSide > 0 ||

42 f.state == DisplayFeatureState.postureHalfOpened);

44class AdaptiveLayout {

45 final Size size;

46 final EdgeInsets padding;

47 final List<DisplayFeature> features;

48 const AdaptiveLayout(

49 this.size, {

50 this.padding = EdgeInsets.zero,

51 this.features = const [],

52 });

54 factory AdaptiveLayout.of(BuildContext context) => AdaptiveLayout(

55 MediaQuery.sizeOf(context),

56 padding: MediaQuery.viewPaddingOf(context),

57 features: MediaQuery.displayFeaturesOf(context),

58 );

60 WindowClass get windowClass => WindowClass.ofWidth(size.width);

61 bool get landscape => size.width > size.height;

63 /// System bars placed on a side edge (landscape phones, or displays whose

64 /// status area sits beside the content) favour side navigation.

65 bool get sideSystemBars {

66 final side = math.max(padding.left, padding.right);

67 return side > 0 && side > padding.top;

68 }

70 /// The first separating feature that crosses the whole window, if any.

71 DisplayFeature? get separatingFeature {

72 for (final f in features) {

73 if (!isSeparating(f)) continue;

74 final b = f.bounds;

75 final vertical = b.height >= size.height - 1 && b.width < size.width;

76 final horizontal = b.width >= size.width - 1 && b.height < size.height;

77 if (vertical || horizontal) return f;

78 }

79 return null;

80 }

82 /// Rail instead of a bottom bar: enough width, or a short landscape window

83 /// where a bottom bar would eat a large part of the height.

84 /// A tabletop posture: the fold runs across the window.

85 bool get horizontalFold {

86 final f = separatingFeature;

87 return f != null && f.bounds.width >= size.width - 1;

88 }

90 /// Rail instead of a bottom bar: enough width, or a short landscape window

91 /// where a bottom bar would eat a large part of the height. In a tabletop

92 /// posture the bar stays in the lower half, away from the fold.

93 bool get useRail =>

94 !horizontalFold &&

95 (size.width >= WindowClass.mediumMin ||

96 (size.width >= 480 && (landscape || sideSystemBars)));

98 /// List and detail side by side.

99 bool get twoPane =>

100 windowClass >= WindowClass.expanded || separatingFeature != null;

101}

102

103/// Lays [primary] and an optional [secondary] pane out. A separating fold or

104/// hinge always gets a pane on each side and nothing under it; otherwise the

105/// secondary pane takes [secondaryWidth] at the start.

106class FoldAwareSplit extends StatefulWidget {

107 final Widget primary;

108 final Widget? secondary;

109 final double secondaryWidth;

110 const FoldAwareSplit({

111 required this.primary,

112 this.secondary,

113 this.secondaryWidth = 360,

114 super.key,

115 });

116 @override

117 State<FoldAwareSplit> createState() => _FoldAwareSplitState();

118}

119

120class _FoldAwareSplitState extends State<FoldAwareSplit> {

121 // Display features are in window coordinates; this is where we are in it.

122 Rect? global;

123

124 void _measure(_) {

125 if (!mounted) return;

126 final box = context.findRenderObject() as RenderBox?;

127 if (box == null || !box.hasSize) return;

128 final next = box.localToGlobal(Offset.zero) & box.size;

129 if (next != global) setState(() => global = next);

130 }

131

132 @override

133 Widget build(BuildContext context) {

134 final features = MediaQuery.displayFeaturesOf(context);

135 final fold = features.where(isSeparating).firstOrNull;

136 if (fold != null) WidgetsBinding.instance.addPostFrameCallback(_measure);

137 return LayoutBuilder(

138 builder: (context, constraints) {

139 final size = constraints.biggest;

140 final secondary = widget.secondary;

141 Rect? local;

142 if (fold != null && global != null && global!.size == size) {

143 local = fold.bounds.shift(-global!.topLeft);

144 }

145 if (local != null) {

146 final vertical = local.height >= size.height - 1;

147 final spans = vertical

148 ? local.top <= 1 && local.bottom >= size.height - 1

149 : local.left <= 1 && local.right >= size.width - 1;

150 final a = vertical ? local.left : local.top;

151 final b = vertical

152 ? size.width - local.right

153 : size.height - local.bottom;

154 // A fold outside this box, or at its very edge, needs no split.

155 if (spans && a >= 1 && b >= 1) {

156 final gap = vertical ? local.width : local.height;

157 // Vertical (book) fold: list at the start, detail at the end.

158 // Horizontal (tabletop) fold: detail above, list below.

159 final first = vertical ? secondary : widget.primary;

160 final second = vertical ? widget.primary : secondary;

161 // Insets on the fold side belong to the other pane.

162 Widget pane(Widget? child, {required bool leading}) =>

163 MediaQuery.removePadding(

164 context: context,

165 removeLeft: vertical && !leading,

166 removeRight: vertical && leading,

167 removeTop: !vertical && !leading,

168 removeBottom: !vertical && leading,

169 child: child ?? const SizedBox.shrink(),

170 );

171 return Flex(

172 direction: vertical ? Axis.horizontal : Axis.vertical,

173 crossAxisAlignment: CrossAxisAlignment.stretch,

174 children: [

175 SizedBox(

176 width: vertical ? a : null,

177 height: vertical ? null : a,

178 child: pane(first, leading: true),

179 ),

180 SizedBox(

181 width: vertical ? gap : null,

182 height: vertical ? null : gap,

183 ),

184 Expanded(child: pane(second, leading: false)),

185 ],

186 );

187 }

188 }

189 if (secondary == null) return widget.primary;

190 return Row(

191 crossAxisAlignment: CrossAxisAlignment.stretch,

192 children: [

193 SizedBox(

194 width: math.min(widget.secondaryWidth, size.width / 2),

195 child: secondary,

196 ),

197 const VerticalDivider(width: 1),

198 Expanded(child: widget.primary),

199 ],

200 );

201 },

202 );

203 }

204}

205

206/// Centers scrolling content at a readable width while the scroll area itself

207/// (and its scrollbar) still spans the full width.

208EdgeInsets readablePadding(

209 BoxConstraints constraints, {

210 double maxWidth = 760,

211 double gutter = 20,

212}) {

213 // Narrow panes (split screen, one side of a fold) keep more room for content.

214 if (constraints.maxWidth < 360) gutter = math.min(gutter, 8);

215 final side = math.max(gutter, (constraints.maxWidth - maxWidth) / 2);

216 return EdgeInsets.symmetric(horizontal: side, vertical: gutter);

217}

218

219/// Gives [child] at least [minHeight]; when the space is shorter (software

220/// keyboard in a landscape phone, a tiny split-screen window) the content

221/// scrolls instead of overflowing.

222class MinHeight extends StatelessWidget {

223 final double minHeight;

224 final Widget child;

225 const MinHeight({required this.minHeight, required this.child, super.key});

226 @override

227 Widget build(BuildContext context) => LayoutBuilder(

228 builder: (context, constraints) => constraints.maxHeight >= minHeight

229 ? child

230 : SingleChildScrollView(

231 child: SizedBox(height: minHeight, child: child),

232 ),

233 );

234}

235

236/// The software keyboard leaves so little height that app chrome should step

237/// aside for the content being typed into.

238bool keyboardSqueezed(BuildContext context) {

239 final keyboard = MediaQuery.viewInsetsOf(context).bottom;

240 return keyboard > 0 && MediaQuery.sizeOf(context).height - keyboard < 360;

241}

242

243/// Places equal-width tiles into as many columns as fit [minTileWidth].

244class AdaptiveGrid extends StatelessWidget {

245 final List<Widget> children;

246 final double minTileWidth, spacing;

247 final int maxColumns;

248 const AdaptiveGrid({

249 required this.children,

250 this.minTileWidth = 260,

251 this.spacing = 10,

252 this.maxColumns = 4,

253 super.key,

254 });

255 @override

256 Widget build(BuildContext context) => LayoutBuilder(

257 builder: (context, constraints) {

258 final width = constraints.maxWidth;

259 final columns = ((width + spacing) / (minTileWidth + spacing))

260 .floor()

261 .clamp(1, maxColumns);

262 final tile = (width - spacing * (columns - 1)) / columns;

263 return Wrap(

264 spacing: spacing,

265 children: [

266 for (final child in children) SizedBox(width: tile, child: child),

267 ],

268 );

269 },

270 );

271}

272

273/// Keeps a minimum logical canvas for windows smaller than [minimumCanvas]

274/// (tiny split-screen or freeform windows) and lets the user scroll it.

275class MinimumCanvas extends StatelessWidget {

276 final Widget child;

277 const MinimumCanvas({required this.child, super.key});

278 @override

279 Widget build(BuildContext context) {

280 final media = MediaQuery.of(context);

281 final size = media.size;

282 if (size.width >= minimumCanvas.width &&

283 size.height >= minimumCanvas.height) {

284 return child;

285 }

286 final canvas = Size(

287 math.max(size.width, minimumCanvas.width),

288 math.max(size.height, minimumCanvas.height),

289 );

290 return Material(

291 child: SingleChildScrollView(

292 scrollDirection: Axis.horizontal,

293 child: SingleChildScrollView(

294 child: MediaQuery(

295 data: media.copyWith(size: canvas),

296 child: SizedBox.fromSize(size: canvas, child: child),

297 ),

298 ),

299 ),

300 );

301 }

302}

303

304/// Navigation labels follow the system text size up to a limit, so that six

305/// destinations stay reachable; their semantics labels are never truncated.

306Widget clampNavigationText(Widget child) =>

307 MediaQuery.withClampedTextScaling(maxScaleFactor: 1.5, child: child);

308

SHA-256

29e557013bea9abc69dfbfdec66e38670adfd3e8584394efbec085da6fbfa015

CH-J Proprietary Software License 1.14 · Ibinibigay ang source sa ilalim ng CH-J Proprietary Software License 1.14. Hindi binabago ng pagiging available nito ang mga tuntunin ng lisensya at hindi ito nagbibigay ng karagdagang karapatan.

SHA-256 ng archive

46e427a43e87af091004f36145590bda8fe90086dfb0f631afeb5029fb0b5655