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91 行
3.5 KiB
91 行
3.5 KiB
using Unity.UIWidgets.foundation;
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namespace Unity.UIWidgets.widgets {
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public class Visibility : StatelessWidget {
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public Visibility(
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Key key = null,
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Widget child = null,
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Widget replacement = null,
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bool visible = true,
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bool maintainState = false,
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bool maintainAnimation = false,
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bool maintainSize = false,
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bool maintainInteractivity = false
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) : base(key: key) {
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D.assert(child != null);
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D.assert(maintainState == true || maintainAnimation == false,
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"Cannot maintain animations if the state is not also maintained.");
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D.assert(maintainAnimation == true || maintainSize == false,
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"Cannot maintain size if animations are not maintained.");
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D.assert(maintainSize == true || maintainInteractivity == false,
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"Cannot maintain interactivity if size is not maintained.");
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this.replacement = replacement ?? SizedBox.shrink();
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this.child = child;
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this.visible = visible;
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this.maintainState = maintainState;
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this.maintainAnimation = maintainAnimation;
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this.maintainSize = maintainSize;
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this.maintainInteractivity = maintainInteractivity;
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}
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public readonly Widget child;
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public readonly Widget replacement;
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public readonly bool visible;
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public readonly bool maintainState;
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public readonly bool maintainAnimation;
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public readonly bool maintainSize;
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public readonly bool maintainInteractivity;
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public override Widget build(BuildContext context) {
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if (this.maintainSize) {
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Widget result = this.child;
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if (!this.maintainInteractivity) {
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result = new IgnorePointer(
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child: this.child,
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ignoring: !this.visible
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);
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}
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return new Opacity(
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opacity: this.visible ? 1.0f : 0.0f,
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child: result
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);
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}
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D.assert(!this.maintainInteractivity);
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D.assert(!this.maintainSize);
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if (this.maintainState) {
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Widget result = this.child;
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if (!this.maintainAnimation) {
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result = new TickerMode(child: this.child, enabled: this.visible);
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}
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return new Offstage(
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child: result,
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offstage: !this.visible
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);
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}
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D.assert(!this.maintainAnimation);
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D.assert(!this.maintainState);
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return this.visible ? this.child : this.replacement;
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}
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public override void debugFillProperties(DiagnosticPropertiesBuilder properties) {
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base.debugFillProperties(properties);
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properties.add(new FlagProperty("visible", value: this.visible, ifFalse: "hidden", ifTrue: "visible"));
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properties.add(new FlagProperty("maintainState", value: this.maintainState, ifFalse: "maintainState"));
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properties.add(new FlagProperty("maintainAnimation", value: this.maintainAnimation,
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ifFalse: "maintainAnimation"));
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properties.add(new FlagProperty("maintainSize", value: this.maintainSize, ifFalse: "maintainSize"));
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properties.add(new FlagProperty("maintainInteractivity", value: this.maintainInteractivity,
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ifFalse: "maintainInteractivity"));
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}
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}
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}
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