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1058 行
43 KiB
1058 行
43 KiB
using System;
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using System.Text;
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using Unity.UIWidgets.foundation;
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using Unity.UIWidgets.gestures;
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using Unity.UIWidgets.painting;
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using Unity.UIWidgets.ui;
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using UnityEngine;
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using Canvas = Unity.UIWidgets.ui.Canvas;
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using Rect = Unity.UIWidgets.ui.Rect;
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namespace Unity.UIWidgets.rendering {
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public enum GrowthDirection {
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forward,
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reverse,
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}
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public static class GrowthDirectionUtils {
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public static AxisDirection applyGrowthDirectionToAxisDirection(
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AxisDirection axisDirection, GrowthDirection growthDirection) {
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switch (growthDirection) {
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case GrowthDirection.forward:
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return axisDirection;
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case GrowthDirection.reverse:
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return AxisUtils.flipAxisDirection(axisDirection);
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}
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throw new Exception("unknown growthDirection");
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}
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public static ScrollDirection applyGrowthDirectionToScrollDirection(
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ScrollDirection scrollDirection, GrowthDirection growthDirection) {
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switch (growthDirection) {
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case GrowthDirection.forward:
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return scrollDirection;
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case GrowthDirection.reverse:
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return ScrollDirectionUtils.flipScrollDirection(scrollDirection);
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}
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throw new Exception("unknown growthDirection");
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}
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}
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public class SliverConstraints : Constraints, IEquatable<SliverConstraints> {
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public SliverConstraints(
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AxisDirection axisDirection,
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GrowthDirection growthDirection,
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ScrollDirection userScrollDirection,
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float scrollOffset,
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float precedingScrollExtent,
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float overlap,
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float remainingPaintExtent,
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float crossAxisExtent,
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AxisDirection crossAxisDirection,
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float viewportMainAxisExtent,
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float remainingCacheExtent,
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float cacheOrigin
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) {
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this.axisDirection = axisDirection;
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this.growthDirection = growthDirection;
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this.userScrollDirection = userScrollDirection;
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this.scrollOffset = scrollOffset;
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this.precedingScrollExtent = precedingScrollExtent;
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this.overlap = overlap;
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this.remainingPaintExtent = remainingPaintExtent;
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this.crossAxisExtent = crossAxisExtent;
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this.crossAxisDirection = crossAxisDirection;
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this.viewportMainAxisExtent = viewportMainAxisExtent;
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this.remainingCacheExtent = remainingCacheExtent;
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this.cacheOrigin = cacheOrigin;
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}
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public SliverConstraints copyWith(
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AxisDirection? axisDirection = null,
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GrowthDirection? growthDirection = null,
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ScrollDirection? userScrollDirection = null,
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float? scrollOffset = null,
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float? precedingScrollExtent = null,
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float? overlap = null,
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float? remainingPaintExtent = null,
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float? crossAxisExtent = null,
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AxisDirection? crossAxisDirection = null,
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float? viewportMainAxisExtent = null,
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float? remainingCacheExtent = null,
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float? cacheOrigin = null
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) {
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return new SliverConstraints(
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axisDirection: axisDirection ?? this.axisDirection,
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growthDirection: growthDirection ?? this.growthDirection,
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userScrollDirection: userScrollDirection ?? this.userScrollDirection,
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scrollOffset: scrollOffset ?? this.scrollOffset,
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precedingScrollExtent: precedingScrollExtent ?? this.precedingScrollExtent,
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overlap: overlap ?? this.overlap,
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remainingPaintExtent: remainingPaintExtent ?? this.remainingPaintExtent,
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crossAxisExtent: crossAxisExtent ?? this.crossAxisExtent,
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crossAxisDirection: crossAxisDirection ?? this.crossAxisDirection,
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viewportMainAxisExtent: viewportMainAxisExtent ?? this.viewportMainAxisExtent,
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remainingCacheExtent: remainingCacheExtent ?? this.remainingCacheExtent,
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cacheOrigin: cacheOrigin ?? this.cacheOrigin
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);
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}
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public readonly AxisDirection axisDirection;
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public readonly GrowthDirection growthDirection;
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public readonly ScrollDirection userScrollDirection;
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public readonly float scrollOffset;
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public readonly float precedingScrollExtent;
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public readonly float overlap;
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public readonly float remainingPaintExtent;
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public readonly float crossAxisExtent;
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public readonly AxisDirection crossAxisDirection;
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public readonly float viewportMainAxisExtent;
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public readonly float cacheOrigin;
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public readonly float remainingCacheExtent;
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public Axis axis {
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get { return AxisUtils.axisDirectionToAxis(axisDirection); }
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}
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public GrowthDirection normalizedGrowthDirection {
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get {
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switch (axisDirection) {
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case AxisDirection.down:
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case AxisDirection.right:
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return growthDirection;
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case AxisDirection.up:
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case AxisDirection.left:
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switch (growthDirection) {
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case GrowthDirection.forward:
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return GrowthDirection.reverse;
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case GrowthDirection.reverse:
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return GrowthDirection.forward;
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}
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throw new Exception("unknown growthDirection");
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}
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throw new Exception("unknown axisDirection");
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}
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}
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public override bool isTight {
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get { return false; }
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}
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public override bool isNormalized {
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get {
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return scrollOffset >= 0.0f
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&& crossAxisExtent >= 0.0f
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&& AxisUtils.axisDirectionToAxis(axisDirection) !=
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AxisUtils.axisDirectionToAxis(crossAxisDirection)
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&& viewportMainAxisExtent >= 0.0f
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&& remainingPaintExtent >= 0.0f;
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}
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}
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public BoxConstraints asBoxConstraints(
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float minExtent = 0.0f,
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float maxExtent = float.PositiveInfinity,
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float? crossAxisExtent = null
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) {
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crossAxisExtent = crossAxisExtent ?? this.crossAxisExtent;
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switch (axis) {
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case Axis.horizontal:
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return new BoxConstraints(
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minHeight: crossAxisExtent.Value,
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maxHeight: crossAxisExtent.Value,
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minWidth: minExtent,
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maxWidth: maxExtent
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);
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case Axis.vertical:
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return new BoxConstraints(
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minWidth: crossAxisExtent.Value,
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maxWidth: crossAxisExtent.Value,
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minHeight: minExtent,
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maxHeight: maxExtent
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);
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}
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D.assert(false);
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return null;
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}
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public override bool debugAssertIsValid(
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bool isAppliedConstraint = false,
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InformationCollector informationCollector = null
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) {
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D.assert(() => {
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var verify = new Action<bool, string>((bool check, string message) => {
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if (check) {
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return;
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}
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var information = new StringBuilder();
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if (informationCollector != null) {
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informationCollector(information);
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}
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throw new UIWidgetsError(
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$"{GetType()} is not valid: {message}\n{information}The offending constraints were: \n {this}");
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});
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verify(scrollOffset >= 0.0f, "The \"scrollOffset\" is negative.");
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verify(crossAxisExtent >= 0.0f, "The \"crossAxisExtent\" is negative.");
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verify(
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AxisUtils.axisDirectionToAxis(axisDirection) !=
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AxisUtils.axisDirectionToAxis(crossAxisDirection),
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"The \"axisDirection\" and the \"crossAxisDirection\" are along the same axis.");
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verify(viewportMainAxisExtent >= 0.0f, "The \"viewportMainAxisExtent\" is negative.");
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verify(remainingPaintExtent >= 0.0f, "The \"remainingPaintExtent\" is negative.");
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verify(remainingCacheExtent >= 0.0f, "The \"remainingCacheExtent\" is negative.");
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verify(cacheOrigin <= 0.0f, "The \"cacheOrigin\" is positive.");
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verify(isNormalized, "The constraints are not normalized.");
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return true;
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});
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return true;
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}
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public bool Equals(SliverConstraints other) {
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if (ReferenceEquals(null, other)) {
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return false;
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}
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if (ReferenceEquals(this, other)) {
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return true;
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}
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return axisDirection == other.axisDirection
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&& growthDirection == other.growthDirection
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&& userScrollDirection == other.userScrollDirection
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&& scrollOffset.Equals(other.scrollOffset)
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&& overlap.Equals(other.overlap)
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&& remainingPaintExtent.Equals(other.remainingPaintExtent)
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&& crossAxisExtent.Equals(other.crossAxisExtent)
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&& crossAxisDirection == other.crossAxisDirection
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&& viewportMainAxisExtent.Equals(other.viewportMainAxisExtent)
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&& cacheOrigin.Equals(other.cacheOrigin)
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&& remainingCacheExtent.Equals(other.remainingCacheExtent);
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}
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public override bool Equals(object obj) {
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if (ReferenceEquals(null, obj)) {
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return false;
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}
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if (ReferenceEquals(this, obj)) {
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return true;
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}
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if (obj.GetType() != GetType()) {
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return false;
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}
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return Equals((SliverConstraints) obj);
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}
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public override int GetHashCode() {
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unchecked {
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var hashCode = (int) axisDirection;
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hashCode = (hashCode * 397) ^ (int) growthDirection;
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hashCode = (hashCode * 397) ^ (int) userScrollDirection;
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hashCode = (hashCode * 397) ^ scrollOffset.GetHashCode();
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hashCode = (hashCode * 397) ^ overlap.GetHashCode();
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hashCode = (hashCode * 397) ^ remainingPaintExtent.GetHashCode();
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hashCode = (hashCode * 397) ^ crossAxisExtent.GetHashCode();
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hashCode = (hashCode * 397) ^ (int) crossAxisDirection;
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hashCode = (hashCode * 397) ^ viewportMainAxisExtent.GetHashCode();
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hashCode = (hashCode * 397) ^ cacheOrigin.GetHashCode();
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hashCode = (hashCode * 397) ^ remainingCacheExtent.GetHashCode();
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return hashCode;
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}
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}
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public static bool operator ==(SliverConstraints left, SliverConstraints right) {
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return Equals(left, right);
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}
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public static bool operator !=(SliverConstraints left, SliverConstraints right) {
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return !Equals(left, right);
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}
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public override string ToString() {
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return
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$"SliverConstraints({axisDirection}， {growthDirection}， {userScrollDirection}， scrollOffset: {scrollOffset:F1}, remainingPaintExtent: {remainingCacheExtent:F1}, " +
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$"{(overlap != 0.0f ? "overlap: " + overlap.ToString("F1") + ", " : "")}crossAxisExtent: {crossAxisExtent:F1}, crossAxisDirection: {crossAxisDirection}, " +
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$"viewportMainAxisExtent: {viewportMainAxisExtent:F1}, remainingCacheExtent: {remainingCacheExtent:F1} " +
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$"cacheOrigin: {cacheOrigin:F1})";
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}
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}
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public class SliverGeometry : Diagnosticable {
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public SliverGeometry(
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float scrollExtent = 0.0f,
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float paintExtent = 0.0f,
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float paintOrigin = 0.0f,
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float? layoutExtent = null,
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float maxPaintExtent = 0.0f,
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float maxScrollObstructionExtent = 0.0f,
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float? hitTestExtent = null,
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bool? visible = null,
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bool hasVisualOverflow = false,
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float? scrollOffsetCorrection = null,
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float? cacheExtent = null
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) {
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D.assert(scrollOffsetCorrection != 0.0f);
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this.scrollExtent = scrollExtent;
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this.paintExtent = paintExtent;
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this.paintOrigin = paintOrigin;
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this.layoutExtent = layoutExtent ?? paintExtent;
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this.maxPaintExtent = maxPaintExtent;
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this.maxScrollObstructionExtent = maxScrollObstructionExtent;
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this.hitTestExtent = hitTestExtent ?? paintExtent;
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this.visible = visible ?? paintExtent > 0.0f;
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this.hasVisualOverflow = hasVisualOverflow;
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this.scrollOffsetCorrection = scrollOffsetCorrection;
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this.cacheExtent = cacheExtent ?? layoutExtent ?? paintExtent;
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}
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public static readonly SliverGeometry zero = new SliverGeometry();
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public readonly float scrollExtent;
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public readonly float paintOrigin;
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public readonly float paintExtent;
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public readonly float layoutExtent;
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public readonly float maxPaintExtent;
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public readonly float maxScrollObstructionExtent;
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public readonly float hitTestExtent;
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public readonly bool visible;
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public readonly bool hasVisualOverflow;
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public readonly float? scrollOffsetCorrection;
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public readonly float cacheExtent;
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public const float precisionErrorTolerance = 1e-10f;
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internal static string _debugCompareFloats(string labelA, float valueA, string labelB, float valueB) {
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if (valueA.ToString("F1") != valueB.ToString("F1")) {
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return $"The {labelA} is {valueA:F1}, but the {labelB} is {valueB:F1}. ";
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}
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return string.Format(
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"The {0} is {1}, but the {2} is {3}. " +
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"Maybe you have fallen prey to floating point rounding errors, and should explicitly " +
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"apply the min() or max() functions, or the clamp() method, to the {2}? ",
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labelA, valueA, labelB, valueB);
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}
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public bool debugAssertIsValid(InformationCollector informationCollector = null) {
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D.assert(() => {
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var verify = new Action<bool, string>((bool check, string message) => {
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if (check) {
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return;
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}
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var information = new StringBuilder();
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if (informationCollector != null) {
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informationCollector(information);
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}
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throw new UIWidgetsError($"{GetType()} is not valid: {message}\n{information}");
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});
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verify(scrollExtent >= 0.0f, "The \"scrollExtent\" is negative.");
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verify(paintExtent >= 0.0f, "The \"paintExtent\" is negative.");
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verify(layoutExtent >= 0.0f, "The \"layoutExtent\" is negative.");
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verify(cacheExtent >= 0.0f, "The \"cacheExtent\" is negative.");
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if (layoutExtent > paintExtent) {
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verify(false,
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"The \"layoutExtent\" exceeds the \"paintExtent\".\n" +
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_debugCompareFloats("paintExtent", paintExtent, "layoutExtent",
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layoutExtent)
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);
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}
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if (paintExtent - maxPaintExtent > precisionErrorTolerance) {
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verify(false,
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"The \"maxPaintExtent\" is less than the \"paintExtent\".\n" +
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_debugCompareFloats("maxPaintExtent", maxPaintExtent, "paintExtent",
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paintExtent) +
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"By definition, a sliver can\"t paint more than the maximum that it can paint!"
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);
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}
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verify(hitTestExtent >= 0.0f, "The \"hitTestExtent\" is negative.");
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verify(scrollOffsetCorrection != 0.0f, "The \"scrollOffsetCorrection\" is zero.");
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return true;
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});
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return true;
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}
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public override string toStringShort() {
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return GetType().ToString();
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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 FloatProperty("scrollExtent", scrollExtent));
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if (paintExtent > 0.0f) {
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properties.add(new FloatProperty("paintExtent", paintExtent,
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unit: visible ? null : " but not painting"));
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}
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else if (paintExtent == 0.0f) {
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if (visible) {
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properties.add(new FloatProperty("paintExtent", paintExtent,
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unit: visible ? null : " but visible"));
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}
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properties.add(new FlagProperty("visible", value: visible, ifFalse: "hidden"));
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}
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else {
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properties.add(new FloatProperty("paintExtent", paintExtent, tooltip: "!"));
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}
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properties.add(new FloatProperty("paintOrigin", paintOrigin,
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defaultValue: 0.0f));
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properties.add(new FloatProperty("layoutExtent", layoutExtent,
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defaultValue: paintExtent));
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properties.add(new FloatProperty("maxPaintExtent", maxPaintExtent));
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properties.add(new FloatProperty("hitTestExtent", hitTestExtent,
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defaultValue: paintExtent));
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properties.add(new DiagnosticsProperty<bool>("hasVisualOverflow", hasVisualOverflow,
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defaultValue: false));
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properties.add(new FloatProperty("scrollOffsetCorrection", scrollOffsetCorrection,
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defaultValue: foundation_.kNullDefaultValue));
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properties.add(new FloatProperty("cacheExtent", cacheExtent,
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defaultValue: 0.0f));
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}
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}
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public class SliverHitTestResult : HitTestResult {
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public delegate bool SliverHitTest(SliverHitTestResult result, float mainAxisPosition, float crossAxisPosition);
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public SliverHitTestResult() : base() {
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}
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public SliverHitTestResult(HitTestResult result) : base(result) {
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}
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public bool addWithAxisOffset(
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Offset paintOffset,
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float mainAxisOffset,
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float crossAxisOffset,
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float mainAxisPosition,
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float crossAxisPosition,
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SliverHitTest hitTest
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) {
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D.assert(mainAxisOffset != null);
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D.assert(crossAxisOffset != null);
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D.assert(mainAxisPosition != null);
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D.assert(crossAxisPosition != null);
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D.assert(hitTest != null);
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if (paintOffset != null) {
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pushTransform(new Matrix4().translationValues(-paintOffset.dx, -paintOffset.dy, 0));
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}
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bool isHit = hitTest(
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this,
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mainAxisPosition: mainAxisPosition - mainAxisOffset,
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crossAxisPosition: crossAxisPosition - crossAxisOffset
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);
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if (paintOffset != null) {
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popTransform();
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}
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return isHit;
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}
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}
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public class SliverHitTestEntry : HitTestEntry {
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public SliverHitTestEntry(RenderSliver target,
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float mainAxisPosition = 0.0f,
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float crossAxisPosition = 0.0f
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) : base(target) {
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this.mainAxisPosition = mainAxisPosition;
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this.crossAxisPosition = crossAxisPosition;
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}
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public new RenderSliver target {
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get { return (RenderSliver) base.target; }
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}
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public readonly float mainAxisPosition;
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public readonly float crossAxisPosition;
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public override string ToString() {
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return $"{target.GetType()}@(mainAix: {mainAxisPosition}, crossAix: {crossAxisPosition})";
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}
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}
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public class SliverLogicalParentData : ParentData {
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public float layoutOffset = 0.0f;
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public override string ToString() {
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return "layoutOffset=" + layoutOffset.ToString("F1");
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}
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}
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public class SliverLogicalContainerParentData : ContainerParentDataMixinSliverLogicalParentData<RenderSliver> {
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}
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public class SliverPhysicalParentData : ParentData {
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public Offset paintOffset = Offset.zero;
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public void applyPaintTransform(Matrix4 transform) {
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transform.translate(paintOffset.dx, paintOffset.dy);
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}
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public override string ToString() {
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return "paintOffset=" + paintOffset;
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}
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}
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public class SliverPhysicalContainerParentData : ContainerParentDataMixinSliverPhysicalParentData<RenderSliver> {
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}
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public abstract class RenderSliver : RenderObject {
|
|
public new SliverConstraints constraints {
|
|
get { return (SliverConstraints) base.constraints; }
|
|
}
|
|
|
|
public SliverGeometry geometry {
|
|
get { return _geometry; }
|
|
set {
|
|
D.assert(!(debugDoingThisResize && debugDoingThisLayout));
|
|
D.assert(sizedByParent || !debugDoingThisResize);
|
|
D.assert(() => {
|
|
if ((sizedByParent && debugDoingThisResize) ||
|
|
(!sizedByParent && debugDoingThisLayout)) {
|
|
return true;
|
|
}
|
|
|
|
D.assert(!debugDoingThisResize);
|
|
string contract = "", violation = "", hint = "";
|
|
if (debugDoingThisLayout) {
|
|
D.assert(sizedByParent);
|
|
violation = "It appears that the geometry setter was called from performLayout().";
|
|
hint = "";
|
|
}
|
|
else {
|
|
violation =
|
|
"The geometry setter was called from outside layout (neither performResize() nor performLayout() were being run for this object).";
|
|
if (owner != null && owner.debugDoingLayout) {
|
|
hint =
|
|
"Only the object itself can set its geometry. It is a contract violation for other objects to set it.";
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|
}
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|
}
|
|
|
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if (sizedByParent) {
|
|
contract =
|
|
"Because this RenderSliver has sizedByParent set to true, it must set its geometry in performResize().";
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|
}
|
|
else {
|
|
contract =
|
|
"Because this RenderSliver has sizedByParent set to false, it must set its geometry in performLayout().";
|
|
}
|
|
|
|
throw new UIWidgetsError(
|
|
"RenderSliver geometry setter called incorrectly.\n" +
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|
violation + "\n" +
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|
hint + "\n" +
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contract + "\n" +
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|
"The RenderSliver in question is:\n" +
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|
" " + this
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|
);
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|
});
|
|
|
|
_geometry = value;
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|
}
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|
}
|
|
|
|
SliverGeometry _geometry;
|
|
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|
public override Rect paintBounds {
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|
get {
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|
switch (constraints.axis) {
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|
case Axis.horizontal:
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|
return Rect.fromLTWH(
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|
0.0f, 0.0f,
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|
geometry.paintExtent,
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|
constraints.crossAxisExtent
|
|
);
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|
case Axis.vertical:
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|
return Rect.fromLTWH(
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|
0.0f, 0.0f,
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|
constraints.crossAxisExtent,
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|
geometry.paintExtent
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|
);
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|
}
|
|
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|
D.assert(false);
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|
return null;
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|
}
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|
}
|
|
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public override Rect semanticBounds {
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|
get { return paintBounds; }
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|
}
|
|
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protected override void debugResetSize() {
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|
}
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|
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protected override void debugAssertDoesMeetConstraints() {
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|
D.assert(geometry.debugAssertIsValid(
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informationCollector: (information) => {
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information.AppendLine("The RenderSliver that returned the offending geometry was:");
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|
information.AppendLine(" " + toStringShallow(joiner: "\n "));
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|
}));
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D.assert(() => {
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|
if (geometry.paintExtent > constraints.remainingPaintExtent) {
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|
throw new UIWidgetsError(
|
|
"SliverGeometry has a paintOffset that exceeds the remainingPaintExtent from the constraints.\n" +
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|
"The render object whose geometry violates the constraints is the following:\n" +
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|
" " + toStringShallow(joiner: "\n ") + "\n" +
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SliverGeometry._debugCompareFloats(
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|
"remainingPaintExtent", constraints.remainingPaintExtent,
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|
"paintExtent", geometry.paintExtent) +
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|
"The paintExtent must cause the child sliver to paint within the viewport, and so " +
|
|
"cannot exceed the remainingPaintExtent."
|
|
);
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|
}
|
|
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|
return true;
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|
});
|
|
}
|
|
|
|
protected override void performResize() {
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|
D.assert(false);
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|
}
|
|
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|
public float centerOffsetAdjustment {
|
|
get { return 0.0f; }
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|
}
|
|
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public bool hitTest(SliverHitTestResult result, float mainAxisPosition = 0, float crossAxisPosition = 0) {
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|
if (mainAxisPosition >= 0.0f && mainAxisPosition < geometry.hitTestExtent &&
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|
crossAxisPosition >= 0.0f && crossAxisPosition < constraints.crossAxisExtent) {
|
|
if (hitTestChildren(result, mainAxisPosition: mainAxisPosition,
|
|
crossAxisPosition: crossAxisPosition) ||
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|
hitTestSelf(mainAxisPosition: mainAxisPosition, crossAxisPosition: crossAxisPosition)) {
|
|
result.add(new SliverHitTestEntry(
|
|
this,
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|
mainAxisPosition: mainAxisPosition,
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|
crossAxisPosition: crossAxisPosition
|
|
));
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|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
protected virtual bool hitTestSelf(float mainAxisPosition = 0, float crossAxisPosition = 0) {
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|
return false;
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|
}
|
|
|
|
protected virtual bool hitTestChildren(SliverHitTestResult result, float mainAxisPosition = 0,
|
|
float crossAxisPosition = 0) {
|
|
return false;
|
|
}
|
|
|
|
public float calculatePaintOffset(SliverConstraints constraints, float from, float to) {
|
|
D.assert(from <= to);
|
|
float a = constraints.scrollOffset;
|
|
float b = constraints.scrollOffset + constraints.remainingPaintExtent;
|
|
return (to.clamp(a, b) - from.clamp(a, b)).clamp(0.0f, constraints.remainingPaintExtent);
|
|
}
|
|
|
|
public float calculateCacheOffset(SliverConstraints constraints, float from, float to) {
|
|
D.assert(from <= to);
|
|
float a = constraints.scrollOffset + constraints.cacheOrigin;
|
|
float b = constraints.scrollOffset + constraints.remainingCacheExtent;
|
|
return (to.clamp(a, b) - from.clamp(a, b)).clamp(0.0f, constraints.remainingCacheExtent);
|
|
}
|
|
|
|
public virtual float childMainAxisPosition(RenderObject child) {
|
|
D.assert(() => { throw new UIWidgetsError(GetType() + " does not implement childPosition."); });
|
|
|
|
return 0.0f;
|
|
}
|
|
|
|
public virtual float childCrossAxisPosition(RenderObject child) {
|
|
return 0.0f;
|
|
}
|
|
|
|
public virtual float childScrollOffset(RenderObject child) {
|
|
D.assert(child.parent == this);
|
|
return 0.0f;
|
|
}
|
|
|
|
public override void applyPaintTransform(RenderObject child, Matrix4 transform) {
|
|
D.assert(() => { throw new UIWidgetsError(GetType() + " does not implement applyPaintTransform."); });
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|
}
|
|
|
|
internal Size getAbsoluteSizeRelativeToOrigin() {
|
|
D.assert(geometry != null);
|
|
D.assert(!debugNeedsLayout);
|
|
|
|
switch (GrowthDirectionUtils.applyGrowthDirectionToAxisDirection(
|
|
constraints.axisDirection, constraints.growthDirection)) {
|
|
case AxisDirection.up:
|
|
return new Size(constraints.crossAxisExtent, -geometry.paintExtent);
|
|
case AxisDirection.right:
|
|
return new Size(geometry.paintExtent, constraints.crossAxisExtent);
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|
case AxisDirection.down:
|
|
return new Size(constraints.crossAxisExtent, geometry.paintExtent);
|
|
case AxisDirection.left:
|
|
return new Size(-geometry.paintExtent, constraints.crossAxisExtent);
|
|
}
|
|
|
|
D.assert(false);
|
|
return null;
|
|
}
|
|
|
|
protected Size getAbsoluteSize() {
|
|
D.assert(geometry != null);
|
|
D.assert(!debugNeedsLayout);
|
|
switch (constraints.axisDirection) {
|
|
case AxisDirection.up:
|
|
case AxisDirection.down:
|
|
return new Size(constraints.crossAxisExtent, geometry.paintExtent);
|
|
case AxisDirection.right:
|
|
case AxisDirection.left:
|
|
return new Size(geometry.paintExtent, constraints.crossAxisExtent);
|
|
}
|
|
return null;
|
|
}
|
|
|
|
void _debugDrawArrow(Canvas canvas, Paint paint, Offset p0, Offset p1, GrowthDirection direction) {
|
|
D.assert(() => {
|
|
if (p0 == p1) {
|
|
return true;
|
|
}
|
|
|
|
D.assert(p0.dx == p1.dx || p0.dy == p1.dy);
|
|
float d = (p1 - p0).distance * 0.2f;
|
|
Offset temp;
|
|
float dx1 = 0, dx2 = 0, dy1 = 0, dy2 = 0;
|
|
switch (direction) {
|
|
case GrowthDirection.forward:
|
|
dx1 = dx2 = dy1 = dy2 = d;
|
|
break;
|
|
case GrowthDirection.reverse:
|
|
temp = p0;
|
|
p0 = p1;
|
|
p1 = temp;
|
|
dx1 = dx2 = dy1 = dy2 = -d;
|
|
break;
|
|
}
|
|
|
|
if (p0.dx == p1.dx) {
|
|
dx2 = -dx2;
|
|
}
|
|
else {
|
|
dy2 = -dy2;
|
|
}
|
|
|
|
// canvas.drawPath(
|
|
// new Path()
|
|
// ..moveTo(p0.dx, p0.dy)
|
|
// ..lineTo(p1.dx, p1.dy)
|
|
// ..moveTo(p1.dx - dx1, p1.dy - dy1)
|
|
// ..lineTo(p1.dx, p1.dy)
|
|
// ..lineTo(p1.dx - dx2, p1.dy - dy2),
|
|
// paint
|
|
// );
|
|
return true;
|
|
});
|
|
}
|
|
|
|
public override void debugPaint(PaintingContext context, Offset offset) {
|
|
D.assert(() => {
|
|
if (D.debugPaintSizeEnabled) {
|
|
float strokeWidth = Mathf.Min(4.0f, geometry.paintExtent / 30.0f);
|
|
Paint paint = new Paint();
|
|
// ..color = const Color(0xFF33CC33)
|
|
// ..strokeWidth = strokeWidth
|
|
// ..style = PaintingStyle.stroke
|
|
// ..maskFilter = new MaskFilter.blur(BlurStyle.solid, strokeWidth);
|
|
float arrowExtent = geometry.paintExtent;
|
|
float padding = Mathf.Max(2.0f, strokeWidth);
|
|
Canvas canvas = context.canvas;
|
|
// canvas.drawCircle(
|
|
// offset.translate(padding, padding),
|
|
// padding * 0.5,
|
|
// paint,
|
|
// );
|
|
switch (constraints.axis) {
|
|
case Axis.vertical:
|
|
// canvas.drawLine(
|
|
// offset,
|
|
// offset.translate(constraints.crossAxisExtent, 0.0f),
|
|
// paint,
|
|
// );
|
|
_debugDrawArrow(
|
|
canvas,
|
|
paint,
|
|
offset.translate(constraints.crossAxisExtent * 1.0f / 4.0f, padding),
|
|
offset.translate(constraints.crossAxisExtent * 1.0f / 4.0f,
|
|
(arrowExtent - padding)),
|
|
constraints.normalizedGrowthDirection
|
|
);
|
|
_debugDrawArrow(
|
|
canvas,
|
|
paint,
|
|
offset.translate(constraints.crossAxisExtent * 3.0f / 4.0f, padding),
|
|
offset.translate(constraints.crossAxisExtent * 3.0f / 4.0f,
|
|
(arrowExtent - padding)),
|
|
constraints.normalizedGrowthDirection
|
|
);
|
|
break;
|
|
case Axis.horizontal:
|
|
// canvas.drawLine(
|
|
// offset,
|
|
// offset.translate(0.0f, constraints.crossAxisExtent),
|
|
// paint,
|
|
// );
|
|
_debugDrawArrow(
|
|
canvas,
|
|
paint,
|
|
offset.translate(padding, constraints.crossAxisExtent * 1.0f / 4.0f),
|
|
offset.translate((arrowExtent - padding),
|
|
constraints.crossAxisExtent * 1.0f / 4.0f),
|
|
constraints.normalizedGrowthDirection
|
|
);
|
|
_debugDrawArrow(
|
|
canvas,
|
|
paint,
|
|
offset.translate(padding, constraints.crossAxisExtent * 3.0f / 4.0f),
|
|
offset.translate((arrowExtent - padding),
|
|
constraints.crossAxisExtent * 3.0f / 4.0f),
|
|
constraints.normalizedGrowthDirection
|
|
);
|
|
break;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
});
|
|
}
|
|
|
|
public override void debugFillProperties(DiagnosticPropertiesBuilder properties) {
|
|
base.debugFillProperties(properties);
|
|
properties.add(new DiagnosticsProperty<SliverGeometry>("geometry", geometry));
|
|
}
|
|
}
|
|
|
|
public static class RenderSliverHelpers {
|
|
public static bool _getRightWayUp(SliverConstraints constraints) {
|
|
D.assert(constraints != null);
|
|
|
|
bool rightWayUp = true;
|
|
|
|
switch (constraints.axisDirection) {
|
|
case AxisDirection.up:
|
|
case AxisDirection.left:
|
|
rightWayUp = false;
|
|
break;
|
|
case AxisDirection.down:
|
|
case AxisDirection.right:
|
|
rightWayUp = true;
|
|
break;
|
|
}
|
|
|
|
switch (constraints.growthDirection) {
|
|
case GrowthDirection.forward:
|
|
break;
|
|
case GrowthDirection.reverse:
|
|
rightWayUp = !rightWayUp;
|
|
break;
|
|
}
|
|
|
|
return rightWayUp;
|
|
}
|
|
|
|
public static bool hitTestBoxChild(this RenderSliver it, BoxHitTestResult result, RenderBox child,
|
|
float mainAxisPosition = 0.0f, float crossAxisPosition = 0.0f) {
|
|
bool rightWayUp = _getRightWayUp(it.constraints);
|
|
float delta = it.childMainAxisPosition(child);
|
|
float crossAxisDelta = it.childCrossAxisPosition(child);
|
|
float absolutePosition = mainAxisPosition - delta;
|
|
float absoluteCrossAxisPosition = crossAxisPosition - crossAxisDelta;
|
|
Offset paintOffset = null;
|
|
Offset transformedPosition = null;
|
|
D.assert(it.constraints.axis != null);
|
|
switch (it.constraints.axis) {
|
|
case Axis.horizontal:
|
|
if (!rightWayUp) {
|
|
absolutePosition = child.size.width - absolutePosition;
|
|
delta = it.geometry.paintExtent - child.size.width - delta;
|
|
}
|
|
paintOffset = new Offset(delta, crossAxisDelta);
|
|
transformedPosition = new Offset(absolutePosition, absoluteCrossAxisPosition);
|
|
break;
|
|
case Axis.vertical:
|
|
if (!rightWayUp) {
|
|
absolutePosition = child.size.height - absolutePosition;
|
|
delta = it.geometry.paintExtent - child.size.height - delta;
|
|
}
|
|
paintOffset = new Offset(crossAxisDelta, delta);
|
|
transformedPosition = new Offset(absoluteCrossAxisPosition, absolutePosition);
|
|
break;
|
|
}
|
|
D.assert(paintOffset != null);
|
|
D.assert(transformedPosition != null);
|
|
return result.addWithPaintOffset(
|
|
offset: paintOffset,
|
|
position: null, // Manually adapting from sliver to box position above.
|
|
hitTest: (BoxHitTestResult boxHitTestResult, Offset _) => {
|
|
return child.hitTest(boxHitTestResult, position: transformedPosition);
|
|
}
|
|
);
|
|
}
|
|
|
|
public static void applyPaintTransformForBoxChild(this RenderSliver it, RenderBox child,
|
|
Matrix4 transform) {
|
|
bool rightWayUp = _getRightWayUp(it.constraints);
|
|
float delta = it.childMainAxisPosition(child);
|
|
float crossAxisDelta = it.childCrossAxisPosition(child);
|
|
switch (it.constraints.axis) {
|
|
case Axis.horizontal:
|
|
if (!rightWayUp) {
|
|
delta = it.geometry.paintExtent - child.size.width - delta;
|
|
}
|
|
|
|
transform.translate(delta, crossAxisDelta);
|
|
break;
|
|
case Axis.vertical:
|
|
if (!rightWayUp) {
|
|
delta = it.geometry.paintExtent - child.size.height - delta;
|
|
}
|
|
|
|
transform.translate(crossAxisDelta, delta);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
public abstract class RenderSliverSingleBoxAdapter : RenderObjectWithChildMixinRenderSliver<RenderBox> {
|
|
public RenderSliverSingleBoxAdapter(
|
|
RenderBox child = null
|
|
) {
|
|
this.child = child;
|
|
}
|
|
|
|
public override void setupParentData(RenderObject child) {
|
|
if (!(child.parentData is SliverPhysicalParentData)) {
|
|
child.parentData = new SliverPhysicalParentData();
|
|
}
|
|
}
|
|
|
|
public void setChildParentData(RenderObject child, SliverConstraints constraints, SliverGeometry geometry) {
|
|
var childParentData = (SliverPhysicalParentData) child.parentData;
|
|
switch (GrowthDirectionUtils.applyGrowthDirectionToAxisDirection(constraints.axisDirection,
|
|
constraints.growthDirection)) {
|
|
case AxisDirection.up:
|
|
childParentData.paintOffset = new Offset(0.0f,
|
|
-(geometry.scrollExtent - (geometry.paintExtent + constraints.scrollOffset)));
|
|
break;
|
|
case AxisDirection.right:
|
|
childParentData.paintOffset = new Offset(-constraints.scrollOffset, 0.0f);
|
|
break;
|
|
case AxisDirection.down:
|
|
childParentData.paintOffset = new Offset(0.0f, -constraints.scrollOffset);
|
|
break;
|
|
case AxisDirection.left:
|
|
childParentData.paintOffset =
|
|
new Offset(-(geometry.scrollExtent - (geometry.paintExtent + constraints.scrollOffset)),
|
|
0.0f);
|
|
break;
|
|
}
|
|
}
|
|
|
|
protected override bool hitTestChildren(SliverHitTestResult result, float mainAxisPosition = 0.0f,
|
|
float crossAxisPosition = 0.0f) {
|
|
D.assert(geometry.hitTestExtent > 0.0f);
|
|
if (child != null) {
|
|
return this.hitTestBoxChild(new BoxHitTestResult(result), child, mainAxisPosition: mainAxisPosition,
|
|
crossAxisPosition: crossAxisPosition);
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
public override float childMainAxisPosition(RenderObject child) {
|
|
return -constraints.scrollOffset;
|
|
}
|
|
|
|
public override void applyPaintTransform(RenderObject child, Matrix4 transform) {
|
|
D.assert(child != null);
|
|
D.assert(child == this.child);
|
|
|
|
var childParentData = (SliverPhysicalParentData) child.parentData;
|
|
childParentData.applyPaintTransform(transform);
|
|
}
|
|
|
|
public override void paint(PaintingContext context, Offset offset) {
|
|
if (child != null && geometry.visible) {
|
|
var childParentData = (SliverPhysicalParentData) child.parentData;
|
|
context.paintChild(child, offset + childParentData.paintOffset);
|
|
}
|
|
}
|
|
}
|
|
|
|
public class RenderSliverToBoxAdapter : RenderSliverSingleBoxAdapter {
|
|
public RenderSliverToBoxAdapter(
|
|
RenderBox child = null
|
|
) : base(child) {
|
|
}
|
|
|
|
protected override void performLayout() {
|
|
if (child == null) {
|
|
geometry = SliverGeometry.zero;
|
|
return;
|
|
}
|
|
|
|
child.layout(constraints.asBoxConstraints(), parentUsesSize: true);
|
|
|
|
float childExtent = 0.0f;
|
|
switch (constraints.axis) {
|
|
case Axis.horizontal:
|
|
childExtent = child.size.width;
|
|
break;
|
|
case Axis.vertical:
|
|
childExtent = child.size.height;
|
|
break;
|
|
}
|
|
|
|
float paintedChildSize = calculatePaintOffset(constraints, from: 0.0f, to: childExtent);
|
|
float cacheExtent = calculateCacheOffset(constraints, from: 0.0f, to: childExtent);
|
|
|
|
D.assert(paintedChildSize.isFinite());
|
|
D.assert(paintedChildSize >= 0.0f);
|
|
|
|
geometry = new SliverGeometry(
|
|
scrollExtent: childExtent,
|
|
paintExtent: paintedChildSize,
|
|
cacheExtent: cacheExtent,
|
|
maxPaintExtent: childExtent,
|
|
hitTestExtent: paintedChildSize,
|
|
hasVisualOverflow: childExtent > constraints.remainingPaintExtent
|
|
|| constraints.scrollOffset > 0.0f
|
|
);
|
|
|
|
setChildParentData(child, constraints, geometry);
|
|
}
|
|
}
|
|
}
|