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147 行
4.8 KiB

using System;
using Unity.UIWidgets.animation;
using Unity.UIWidgets.foundation;
using Unity.UIWidgets.widgets;
namespace Unity.UIWidgets.material {
public static class ThemeUtils {
public static readonly TimeSpan kThemeAnimationDuration = new TimeSpan(0, 0, 0, 0, 200);
}
public class Theme : StatelessWidget {
public Theme(
Key key = null,
ThemeData data = null,
bool isMaterialAppTheme = false,
Widget child = null
) : base(key: key) {
D.assert(child != null);
D.assert(data != null);
this.data = data;
this.isMaterialAppTheme = isMaterialAppTheme;
this.child = child;
}
public readonly ThemeData data;
public readonly bool isMaterialAppTheme;
readonly Widget child;
static readonly ThemeData _kFallbackTheme = ThemeData.fallback();
public static ThemeData of(BuildContext context, bool shadowThemeOnly = false) {
_InheritedTheme inheritedTheme =
(_InheritedTheme) context.inheritFromWidgetOfExactType(typeof(_InheritedTheme));
if (shadowThemeOnly) {
if (inheritedTheme == null || inheritedTheme.theme.isMaterialAppTheme) {
return null;
}
return inheritedTheme.theme.data;
}
MaterialLocalizations localizations = MaterialLocalizations.of(context);
ScriptCategory category = ScriptCategory.englishLike;
ThemeData theme = inheritedTheme?.theme?.data ?? _kFallbackTheme;
return ThemeData.localize(theme, theme.typography.geometryThemeFor(category));
}
public override Widget build(BuildContext context) {
return new _InheritedTheme(
theme: this,
child: new IconTheme(
data: this.data.iconTheme,
child: this.child
)
);
}
public override void debugFillProperties(DiagnosticPropertiesBuilder properties) {
base.debugFillProperties(properties);
properties.add(new DiagnosticsProperty<ThemeData>("data", this.data, showName: false));
}
}
class _InheritedTheme : InheritedWidget {
public _InheritedTheme(
Key key = null,
Theme theme = null,
Widget child = null) : base(key: key, child: child) {
D.assert(theme != null);
D.assert(child != null);
this.theme = theme;
}
public readonly Theme theme;
public override bool updateShouldNotify(InheritedWidget old) {
return this.theme.data != ((_InheritedTheme) old).theme.data;
}
}
class ThemeDataTween : Tween<ThemeData> {
public ThemeDataTween(
ThemeData begin = null,
ThemeData end = null
) : base(begin: begin, end: end) {
}
public override ThemeData lerp(float t) {
return ThemeData.lerp(this.begin, this.end, t);
}
}
class AnimatedTheme : ImplicitlyAnimatedWidget {
public AnimatedTheme(
Key key = null,
ThemeData data = null,
bool isMaterialAppTheme = false,
Curve curve = null,
TimeSpan? duration = null,
Widget child = null
) : base(key: key, curve: curve ?? Curves.linear, duration: duration ?? ThemeUtils.kThemeAnimationDuration) {
D.assert(child != null);
D.assert(data != null);
this.data = data;
this.isMaterialAppTheme = isMaterialAppTheme;
this.child = child;
}
public readonly ThemeData data;
public readonly bool isMaterialAppTheme;
public readonly Widget child;
public override State createState() {
return new _AnimatedThemeState();
}
}
class _AnimatedThemeState : AnimatedWidgetBaseState<AnimatedTheme> {
ThemeDataTween _data;
protected override void forEachTween(TweenVisitor visitor) {
this._data = (ThemeDataTween) visitor.visit(this, this._data, this.widget.data,
(ThemeData value) => new ThemeDataTween(begin: value));
}
public override Widget build(BuildContext context) {
return new Theme(
isMaterialAppTheme: this.widget.isMaterialAppTheme,
child: this.widget.child,
data: this._data.evaluate(this.animation)
);
}
public override void debugFillProperties(DiagnosticPropertiesBuilder description) {
base.debugFillProperties(description);
description.add(
new DiagnosticsProperty<ThemeDataTween>("data", this._data, showName: false, defaultValue: null));
}
}
}