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962 行
41 KiB
962 行
41 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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double scrollOffset,
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double overlap,
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double remainingPaintExtent,
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double crossAxisExtent,
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AxisDirection crossAxisDirection,
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double viewportMainAxisExtent,
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double remainingCacheExtent,
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double 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.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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double? scrollOffset = null,
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double? overlap = null,
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double? remainingPaintExtent = null,
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double? crossAxisExtent = null,
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AxisDirection? crossAxisDirection = null,
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double? viewportMainAxisExtent = null,
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double? remainingCacheExtent = null,
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double? 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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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 double scrollOffset;
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public readonly double overlap;
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public readonly double remainingPaintExtent;
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public readonly double crossAxisExtent;
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public readonly AxisDirection crossAxisDirection;
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public readonly double viewportMainAxisExtent;
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public readonly double cacheOrigin;
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public readonly double remainingCacheExtent;
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public Axis axis {
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get { return AxisUtils.axisDirectionToAxis(this.axisDirection); }
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}
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public GrowthDirection normalizedGrowthDirection {
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get {
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switch (this.axisDirection) {
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case AxisDirection.down:
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case AxisDirection.right:
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return this.growthDirection;
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case AxisDirection.up:
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case AxisDirection.left:
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switch (this.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 this.scrollOffset >= 0.0
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&& this.crossAxisExtent >= 0.0
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&& AxisUtils.axisDirectionToAxis(this.axisDirection) !=
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AxisUtils.axisDirectionToAxis(this.crossAxisDirection)
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&& this.viewportMainAxisExtent >= 0.0
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&& this.remainingPaintExtent >= 0.0;
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}
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}
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public BoxConstraints asBoxConstraints(
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double minExtent = 0.0,
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double maxExtent = double.PositiveInfinity,
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double? crossAxisExtent = null
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) {
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crossAxisExtent = crossAxisExtent ?? this.crossAxisExtent;
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switch (this.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(string.Format(
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"{0} is not valid: {1}\n{2}The offending constraints were: \n {3}",
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this.GetType(), message, information, this));
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});
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verify(this.scrollOffset >= 0.0, "The \"scrollOffset\" is negative.");
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verify(this.crossAxisExtent >= 0.0, "The \"crossAxisExtent\" is negative.");
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verify(
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AxisUtils.axisDirectionToAxis(this.axisDirection) !=
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AxisUtils.axisDirectionToAxis(this.crossAxisDirection),
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"The \"axisDirection\" and the \"crossAxisDirection\" are along the same axis.");
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verify(this.viewportMainAxisExtent >= 0.0, "The \"viewportMainAxisExtent\" is negative.");
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verify(this.remainingPaintExtent >= 0.0, "The \"remainingPaintExtent\" is negative.");
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verify(this.remainingCacheExtent >= 0.0, "The \"remainingCacheExtent\" is negative.");
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verify(this.cacheOrigin <= 0.0, "The \"cacheOrigin\" is positive.");
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verify(this.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 (object.ReferenceEquals(null, other)) return false;
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if (object.ReferenceEquals(this, other)) return true;
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return this.axisDirection == other.axisDirection
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&& this.growthDirection == other.growthDirection
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&& this.userScrollDirection == other.userScrollDirection
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&& this.scrollOffset.Equals(other.scrollOffset)
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&& this.overlap.Equals(other.overlap)
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&& this.remainingPaintExtent.Equals(other.remainingPaintExtent)
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&& this.crossAxisExtent.Equals(other.crossAxisExtent)
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&& this.crossAxisDirection == other.crossAxisDirection
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&& this.viewportMainAxisExtent.Equals(other.viewportMainAxisExtent)
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&& this.cacheOrigin.Equals(other.cacheOrigin)
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&& this.remainingCacheExtent.Equals(other.remainingCacheExtent);
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}
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public override bool Equals(object obj) {
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if (object.ReferenceEquals(null, obj)) return false;
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if (object.ReferenceEquals(this, obj)) return true;
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if (obj.GetType() != this.GetType()) return false;
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return this.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) this.axisDirection;
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hashCode = (hashCode * 397) ^ (int) this.growthDirection;
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hashCode = (hashCode * 397) ^ (int) this.userScrollDirection;
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hashCode = (hashCode * 397) ^ this.scrollOffset.GetHashCode();
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hashCode = (hashCode * 397) ^ this.overlap.GetHashCode();
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hashCode = (hashCode * 397) ^ this.remainingPaintExtent.GetHashCode();
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hashCode = (hashCode * 397) ^ this.crossAxisExtent.GetHashCode();
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hashCode = (hashCode * 397) ^ (int) this.crossAxisDirection;
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hashCode = (hashCode * 397) ^ this.viewportMainAxisExtent.GetHashCode();
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hashCode = (hashCode * 397) ^ this.cacheOrigin.GetHashCode();
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hashCode = (hashCode * 397) ^ this.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 object.Equals(left, right);
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}
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public static bool operator !=(SliverConstraints left, SliverConstraints right) {
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return !object.Equals(left, right);
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}
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public override String ToString() {
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return string.Format(
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"SliverConstraints({0}， {1}， {2}， scrollOffset: {3:F1}, remainingPaintExtent: {4:F1}, " +
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"{5}crossAxisExtent: {6:F1}, crossAxisDirection: {7}, " +
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"viewportMainAxisExtent: {8:F1}, remainingCacheExtent: {9:F1} " +
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"cacheOrigin: {10:F1})", this.axisDirection, this.growthDirection, this.userScrollDirection,
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this.scrollOffset, this.remainingCacheExtent,
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this.overlap != 0.0 ? "overlap: " + this.overlap.ToString("F1") + ", " : "",
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this.crossAxisExtent, this.crossAxisDirection,
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this.viewportMainAxisExtent, this.remainingCacheExtent, this.cacheOrigin);
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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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double scrollExtent = 0.0,
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double paintExtent = 0.0,
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double paintOrigin = 0.0,
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double? layoutExtent = null,
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double maxPaintExtent = 0.0,
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double maxScrollObstructionExtent = 0.0,
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double? hitTestExtent = null,
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bool? visible = null,
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bool hasVisualOverflow = false,
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double? scrollOffsetCorrection = null,
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double? cacheExtent = null
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) {
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D.assert(scrollOffsetCorrection != 0.0);
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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 > 0.0;
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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 double scrollExtent;
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public readonly double paintOrigin;
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public readonly double paintExtent;
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public readonly double layoutExtent;
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public readonly double maxPaintExtent;
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public readonly double maxScrollObstructionExtent;
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public readonly double hitTestExtent;
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public readonly bool visible;
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public readonly bool hasVisualOverflow;
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public readonly double? scrollOffsetCorrection;
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public readonly double cacheExtent;
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internal static string _debugCompareFloats(string labelA, double valueA, string labelB, double valueB) {
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if (valueA.ToString("F1") != valueB.ToString("F1")) {
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return string.Format("The {0} is {1:F1}, but the {2} is {3:F1}. ", labelA, valueA, labelB, valueB);
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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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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(string.Format("{0} is not valid: {1}\n{2}", this.GetType(), message,
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information));
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});
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verify(this.scrollExtent >= 0.0, "The \"scrollExtent\" is negative.");
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verify(this.paintExtent >= 0.0, "The \"paintExtent\" is negative.");
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verify(this.layoutExtent >= 0.0, "The \"layoutExtent\" is negative.");
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verify(this.cacheExtent >= 0.0, "The \"cacheExtent\" is negative.");
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if (this.layoutExtent > this.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", layoutExtent)
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);
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}
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if (this.maxPaintExtent < this.paintExtent) {
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verify(false,
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"The \"maxPaintExtent\" is less than the \"paintExtent\".\n" +
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_debugCompareFloats("maxPaintExtent", this.maxPaintExtent, "paintExtent", this.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(this.hitTestExtent >= 0.0, "The \"hitTestExtent\" is negative.");
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verify(this.scrollOffsetCorrection != 0.0, "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 this.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 DoubleProperty("scrollExtent", this.scrollExtent));
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if (this.paintExtent > 0.0) {
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properties.add(new DoubleProperty("paintExtent", this.paintExtent,
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unit: this.visible ? null : " but not painting"));
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} else if (this.paintExtent == 0.0) {
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if (this.visible) {
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properties.add(new DoubleProperty("paintExtent", this.paintExtent,
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unit: this.visible ? null : " but visible"));
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}
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properties.add(new FlagProperty("visible", value: this.visible, ifFalse: "hidden"));
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} else {
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properties.add(new DoubleProperty("paintExtent", this.paintExtent, tooltip: "!"));
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}
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properties.add(new DoubleProperty("paintOrigin", this.paintOrigin,
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defaultValue: 0.0));
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properties.add(new DoubleProperty("layoutExtent", this.layoutExtent,
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defaultValue: this.paintExtent));
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properties.add(new DoubleProperty("maxPaintExtent", this.maxPaintExtent));
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properties.add(new DoubleProperty("hitTestExtent", this.hitTestExtent,
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defaultValue: this.paintExtent));
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properties.add(new DiagnosticsProperty<bool>("hasVisualOverflow", this.hasVisualOverflow,
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defaultValue: false));
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properties.add(new DoubleProperty("scrollOffsetCorrection", this.scrollOffsetCorrection,
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defaultValue: Diagnostics.kNullDefaultValue));
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properties.add(new DoubleProperty("cacheExtent", this.cacheExtent,
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defaultValue: 0.0));
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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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double mainAxisPosition = 0.0,
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double crossAxisPosition = 0.0
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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 double mainAxisPosition;
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public readonly double crossAxisPosition;
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public override string ToString() {
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return string.Format("{0}@(mainAix: {1}, crossAix: {2})", this.target.GetType(), this.mainAxisPosition,
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this.crossAxisPosition);
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}
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}
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public class SliverLogicalParentData : ParentData {
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public double layoutOffset = 0.0;
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public override string ToString() {
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return "layoutOffset=" + this.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(ref Matrix3 transform) {
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transform = Matrix3.makeTrans(this.paintOffset) * transform;
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}
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public override string ToString() {
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return "paintOffset=" + this.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 {
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public new SliverConstraints constraints {
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get { return (SliverConstraints) base.constraints; }
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}
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public SliverGeometry geometry {
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get { return this._geometry; }
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set {
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D.assert(!(this.debugDoingThisResize && this.debugDoingThisLayout));
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D.assert(this.sizedByParent || !this.debugDoingThisResize);
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D.assert(() => {
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if ((this.sizedByParent && this.debugDoingThisResize) ||
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(!this.sizedByParent && this.debugDoingThisLayout)) {
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return true;
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}
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D.assert(!this.debugDoingThisResize);
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string contract = "", violation = "", hint = "";
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if (this.debugDoingThisLayout) {
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D.assert(this.sizedByParent);
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violation = "It appears that the geometry setter was called from performLayout().";
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hint = "";
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} else {
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violation =
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"The geometry setter was called from outside layout (neither performResize() nor performLayout() were being run for this object).";
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if (this.owner != null && this.owner.debugDoingLayout) {
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hint =
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"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 (this.sizedByParent) {
|
|
contract =
|
|
"Because this RenderSliver has sizedByParent set to true, it must set its geometry in performResize().";
|
|
} 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" +
|
|
violation + "\n" +
|
|
hint + "\n" +
|
|
contract + "\n" +
|
|
"The RenderSliver in question is:\n" +
|
|
" " + this
|
|
);
|
|
});
|
|
|
|
this._geometry = value;
|
|
}
|
|
}
|
|
|
|
SliverGeometry _geometry;
|
|
|
|
public override Rect paintBounds {
|
|
get {
|
|
switch (this.constraints.axis) {
|
|
case Axis.horizontal:
|
|
return Rect.fromLTWH(
|
|
0.0, 0.0,
|
|
this.geometry.paintExtent,
|
|
this.constraints.crossAxisExtent
|
|
);
|
|
case Axis.vertical:
|
|
return Rect.fromLTWH(
|
|
0.0, 0.0,
|
|
this.constraints.crossAxisExtent,
|
|
this.geometry.paintExtent
|
|
);
|
|
}
|
|
|
|
D.assert(false);
|
|
return null;
|
|
}
|
|
}
|
|
|
|
public override Rect semanticBounds {
|
|
get { return paintBounds; }
|
|
}
|
|
|
|
protected override void debugResetSize() {
|
|
}
|
|
|
|
protected override void debugAssertDoesMeetConstraints() {
|
|
D.assert(this.geometry.debugAssertIsValid(
|
|
informationCollector: (information) => {
|
|
information.AppendLine("The RenderSliver that returned the offending geometry was:");
|
|
information.AppendLine(" " + this.toStringShallow(joiner: "\n "));
|
|
}));
|
|
D.assert(() => {
|
|
if (this.geometry.paintExtent > this.constraints.remainingPaintExtent) {
|
|
throw new UIWidgetsError(
|
|
"SliverGeometry has a paintOffset that exceeds the remainingPaintExtent from the constraints.\n" +
|
|
"The render object whose geometry violates the constraints is the following:\n" +
|
|
" " + this.toStringShallow(joiner: "\n ") + "\n" +
|
|
SliverGeometry._debugCompareFloats(
|
|
"remainingPaintExtent", this.constraints.remainingPaintExtent,
|
|
"paintExtent", this.geometry.paintExtent) +
|
|
"The paintExtent must cause the child sliver to paint within the viewport, and so " +
|
|
"cannot exceed the remainingPaintExtent."
|
|
);
|
|
}
|
|
|
|
return true;
|
|
});
|
|
}
|
|
|
|
protected override void performResize() {
|
|
D.assert(false);
|
|
}
|
|
|
|
public double centerOffsetAdjustment {
|
|
get { return 0.0; }
|
|
}
|
|
|
|
public bool hitTest(HitTestResult result, double mainAxisPosition = 0, double crossAxisPosition = 0) {
|
|
if (mainAxisPosition >= 0.0 && mainAxisPosition < this.geometry.hitTestExtent &&
|
|
crossAxisPosition >= 0.0 && crossAxisPosition < this.constraints.crossAxisExtent) {
|
|
if (this.hitTestChildren(result, mainAxisPosition: mainAxisPosition,
|
|
crossAxisPosition: crossAxisPosition) ||
|
|
this.hitTestSelf(mainAxisPosition: mainAxisPosition, crossAxisPosition: crossAxisPosition)) {
|
|
result.add(new SliverHitTestEntry(
|
|
this,
|
|
mainAxisPosition: mainAxisPosition,
|
|
crossAxisPosition: crossAxisPosition
|
|
));
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
protected virtual bool hitTestSelf(double mainAxisPosition = 0, double crossAxisPosition = 0) {
|
|
return false;
|
|
}
|
|
|
|
protected virtual bool hitTestChildren(HitTestResult result, double mainAxisPosition = 0,
|
|
double crossAxisPosition = 0) {
|
|
return false;
|
|
}
|
|
|
|
public double calculatePaintOffset(SliverConstraints constraints, double from, double to) {
|
|
D.assert(from <= to);
|
|
double a = constraints.scrollOffset;
|
|
double b = constraints.scrollOffset + constraints.remainingPaintExtent;
|
|
return (to.clamp(a, b) - from.clamp(a, b)).clamp(0.0, constraints.remainingPaintExtent);
|
|
}
|
|
|
|
public double calculateCacheOffset(SliverConstraints constraints, double from, double to) {
|
|
D.assert(from <= to);
|
|
double a = constraints.scrollOffset + constraints.cacheOrigin;
|
|
double b = constraints.scrollOffset + constraints.remainingCacheExtent;
|
|
return (to.clamp(a, b) - from.clamp(a, b)).clamp(0.0, constraints.remainingCacheExtent);
|
|
}
|
|
|
|
public virtual double childMainAxisPosition(RenderObject child) {
|
|
D.assert(() => { throw new UIWidgetsError(this.GetType() + " does not implement childPosition."); });
|
|
|
|
return 0.0;
|
|
}
|
|
|
|
public virtual double childCrossAxisPosition(RenderObject child) {
|
|
return 0.0;
|
|
}
|
|
|
|
public virtual double childScrollOffset(RenderObject child) {
|
|
D.assert(child.parent == this);
|
|
return 0.0;
|
|
}
|
|
|
|
public override void applyPaintTransform(RenderObject child, ref Matrix3 transform) {
|
|
D.assert(() => { throw new UIWidgetsError(this.GetType() + " does not implement applyPaintTransform."); });
|
|
}
|
|
|
|
internal Size getAbsoluteSizeRelativeToOrigin() {
|
|
D.assert(this.geometry != null);
|
|
D.assert(!this.debugNeedsLayout);
|
|
|
|
switch (GrowthDirectionUtils.applyGrowthDirectionToAxisDirection(
|
|
this.constraints.axisDirection, this.constraints.growthDirection)) {
|
|
case AxisDirection.up:
|
|
return new Size(this.constraints.crossAxisExtent, -this.geometry.paintExtent);
|
|
case AxisDirection.right:
|
|
return new Size(this.geometry.paintExtent, this.constraints.crossAxisExtent);
|
|
case AxisDirection.down:
|
|
return new Size(this.constraints.crossAxisExtent, this.geometry.paintExtent);
|
|
case AxisDirection.left:
|
|
return new Size(-this.geometry.paintExtent, this.constraints.crossAxisExtent);
|
|
}
|
|
|
|
D.assert(false);
|
|
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);
|
|
double d = (p1 - p0).distance * 0.2;
|
|
Offset temp;
|
|
double 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) {
|
|
double strokeWidth = Math.Min(4.0, this.geometry.paintExtent / 30.0);
|
|
Paint paint = new Paint();
|
|
// ..color = const Color(0xFF33CC33)
|
|
// ..strokeWidth = strokeWidth
|
|
// ..style = PaintingStyle.stroke
|
|
// ..maskFilter = new MaskFilter.blur(BlurStyle.solid, strokeWidth);
|
|
double arrowExtent = this.geometry.paintExtent;
|
|
double padding = Math.Max(2.0, 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, 0.0),
|
|
// paint,
|
|
// );
|
|
this._debugDrawArrow(
|
|
canvas,
|
|
paint,
|
|
offset.translate(this.constraints.crossAxisExtent * 1.0 / 4.0, padding),
|
|
offset.translate(this.constraints.crossAxisExtent * 1.0 / 4.0, arrowExtent - padding),
|
|
this.constraints.normalizedGrowthDirection
|
|
);
|
|
this._debugDrawArrow(
|
|
canvas,
|
|
paint,
|
|
offset.translate(this.constraints.crossAxisExtent * 3.0 / 4.0, padding),
|
|
offset.translate(this.constraints.crossAxisExtent * 3.0 / 4.0, arrowExtent - padding),
|
|
this.constraints.normalizedGrowthDirection
|
|
);
|
|
break;
|
|
case Axis.horizontal:
|
|
// canvas.drawLine(
|
|
// offset,
|
|
// offset.translate(0.0, constraints.crossAxisExtent),
|
|
// paint,
|
|
// );
|
|
this._debugDrawArrow(
|
|
canvas,
|
|
paint,
|
|
offset.translate(padding, this.constraints.crossAxisExtent * 1.0 / 4.0),
|
|
offset.translate(arrowExtent - padding, this.constraints.crossAxisExtent * 1.0 / 4.0),
|
|
this.constraints.normalizedGrowthDirection
|
|
);
|
|
this._debugDrawArrow(
|
|
canvas,
|
|
paint,
|
|
offset.translate(padding, this.constraints.crossAxisExtent * 3.0 / 4.0),
|
|
offset.translate(arrowExtent - padding, this.constraints.crossAxisExtent * 3.0 / 4.0),
|
|
this.constraints.normalizedGrowthDirection
|
|
);
|
|
break;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
});
|
|
}
|
|
|
|
public override void debugFillProperties(DiagnosticPropertiesBuilder properties) {
|
|
base.debugFillProperties(properties);
|
|
properties.add(new DiagnosticsProperty<SliverGeometry>("geometry", this.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, HitTestResult result, RenderBox child,
|
|
double mainAxisPosition = 0.0, double crossAxisPosition = 0.0) {
|
|
bool rightWayUp = _getRightWayUp(it.constraints);
|
|
double absolutePosition = mainAxisPosition - it.childMainAxisPosition(child);
|
|
double absoluteCrossAxisPosition = crossAxisPosition - it.childCrossAxisPosition(child);
|
|
switch (it.constraints.axis) {
|
|
case Axis.horizontal:
|
|
if (!rightWayUp) {
|
|
absolutePosition = child.size.width - absolutePosition;
|
|
}
|
|
|
|
return child.hitTest(result, position: new Offset(absolutePosition, absoluteCrossAxisPosition));
|
|
case Axis.vertical:
|
|
if (!rightWayUp) {
|
|
absolutePosition = child.size.height - absolutePosition;
|
|
}
|
|
|
|
return child.hitTest(result, position: new Offset(absoluteCrossAxisPosition, absolutePosition));
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
public static void applyPaintTransformForBoxChild(this RenderSliver it, RenderBox child,
|
|
ref Matrix3 transform) {
|
|
bool rightWayUp = _getRightWayUp(it.constraints);
|
|
double delta = it.childMainAxisPosition(child);
|
|
double crossAxisDelta = it.childCrossAxisPosition(child);
|
|
switch (it.constraints.axis) {
|
|
case Axis.horizontal:
|
|
if (!rightWayUp) {
|
|
delta = it.geometry.paintExtent - child.size.width - delta;
|
|
}
|
|
|
|
transform = Matrix3.makeTrans((float) delta, (float) crossAxisDelta) * transform;
|
|
break;
|
|
case Axis.vertical:
|
|
if (!rightWayUp) {
|
|
delta = it.geometry.paintExtent - child.size.height - delta;
|
|
}
|
|
|
|
transform = Matrix3.makeTrans((float) crossAxisDelta, (float) delta) * transform;
|
|
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(0.0,
|
|
-(geometry.scrollExtent - (geometry.paintExtent + constraints.scrollOffset)));
|
|
break;
|
|
case AxisDirection.right:
|
|
childParentData.paintOffset = new Offset(-constraints.scrollOffset, 0.0);
|
|
break;
|
|
case AxisDirection.down:
|
|
childParentData.paintOffset = new Offset(0.0, -constraints.scrollOffset);
|
|
break;
|
|
case AxisDirection.left:
|
|
childParentData.paintOffset =
|
|
new Offset(-(geometry.scrollExtent - (geometry.paintExtent + constraints.scrollOffset)), 0.0);
|
|
break;
|
|
}
|
|
}
|
|
|
|
protected override bool hitTestChildren(HitTestResult result, double mainAxisPosition = 0.0,
|
|
double crossAxisPosition = 0.0) {
|
|
D.assert(this.geometry.hitTestExtent > 0.0);
|
|
if (this.child != null) {
|
|
return this.hitTestBoxChild(result, this.child, mainAxisPosition: mainAxisPosition,
|
|
crossAxisPosition: crossAxisPosition);
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
public override double childMainAxisPosition(RenderObject child) {
|
|
return -this.constraints.scrollOffset;
|
|
}
|
|
|
|
public override void applyPaintTransform(RenderObject child, ref Matrix3 transform) {
|
|
D.assert(child != null);
|
|
D.assert(child == this.child);
|
|
|
|
var childParentData = (SliverPhysicalParentData) child.parentData;
|
|
childParentData.applyPaintTransform(ref transform);
|
|
}
|
|
|
|
public override void paint(PaintingContext context, Offset offset) {
|
|
if (this.child != null && this.geometry.visible) {
|
|
var childParentData = (SliverPhysicalParentData) this.child.parentData;
|
|
context.paintChild(this.child, offset + childParentData.paintOffset);
|
|
}
|
|
}
|
|
}
|
|
|
|
public class RenderSliverToBoxAdapter : RenderSliverSingleBoxAdapter {
|
|
public RenderSliverToBoxAdapter(
|
|
RenderBox child = null
|
|
) : base(child) {
|
|
}
|
|
|
|
protected override void performLayout() {
|
|
if (this.child == null) {
|
|
this.geometry = SliverGeometry.zero;
|
|
return;
|
|
}
|
|
|
|
this.child.layout(this.constraints.asBoxConstraints(), parentUsesSize: true);
|
|
|
|
double childExtent = 0.0;
|
|
switch (this.constraints.axis) {
|
|
case Axis.horizontal:
|
|
childExtent = this.child.size.width;
|
|
break;
|
|
case Axis.vertical:
|
|
childExtent = this.child.size.height;
|
|
break;
|
|
}
|
|
|
|
double paintedChildSize = this.calculatePaintOffset(this.constraints, from: 0.0, to: childExtent);
|
|
double cacheExtent = this.calculateCacheOffset(this.constraints, from: 0.0, to: childExtent);
|
|
|
|
D.assert(paintedChildSize.isFinite());
|
|
D.assert(paintedChildSize >= 0.0);
|
|
|
|
this.geometry = new SliverGeometry(
|
|
scrollExtent: childExtent,
|
|
paintExtent: paintedChildSize,
|
|
cacheExtent: cacheExtent,
|
|
maxPaintExtent: childExtent,
|
|
hitTestExtent: paintedChildSize,
|
|
hasVisualOverflow: childExtent > this.constraints.remainingPaintExtent
|
|
|| this.constraints.scrollOffset > 0.0
|
|
);
|
|
|
|
this.setChildParentData(this.child, this.constraints, this.geometry);
|
|
}
|
|
}
|
|
}
|