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-rw-r--r--Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Graphics/Image.cs2
-rw-r--r--Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Layout/HorizontalOrVerticalLayoutGroup.cs34
-rw-r--r--Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Layout/ILayoutElement.cs14
-rw-r--r--Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Layout/LayoutGroup.cs14
-rw-r--r--Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Layout/LayoutRebuilder.cs8
-rw-r--r--Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Layout/LayoutUtility.cs2
-rw-r--r--Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Mask/Mask.cs3
7 files changed, 48 insertions, 29 deletions
diff --git a/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Graphics/Image.cs b/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Graphics/Image.cs
index cae7667..4844c19 100644
--- a/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Graphics/Image.cs
+++ b/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Graphics/Image.cs
@@ -1092,7 +1092,7 @@ namespace UnityEngine.UI
if (activeSprite == null)
return true;
-
+
Vector2 local;
if (!RectTransformUtility.ScreenPointToLocalPointInRectangle(rectTransform, screenPoint, eventCamera, out local))
return false;
diff --git a/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Layout/HorizontalOrVerticalLayoutGroup.cs b/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Layout/HorizontalOrVerticalLayoutGroup.cs
index ebb74e2..3e1c923 100644
--- a/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Layout/HorizontalOrVerticalLayoutGroup.cs
+++ b/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Layout/HorizontalOrVerticalLayoutGroup.cs
@@ -1,5 +1,6 @@
namespace UnityEngine.UI
{
+ // 布局算法的核心都在这个基类里面
public abstract class HorizontalOrVerticalLayoutGroup : LayoutGroup
{
[SerializeField] protected float m_Spacing = 0;
@@ -17,21 +18,22 @@ namespace UnityEngine.UI
[SerializeField] protected bool m_ChildControlHeight = true;
public bool childControlHeight { get { return m_ChildControlHeight; } set { SetProperty(ref m_ChildControlHeight, value); } }
+ // 根据子节点计算得到自身的min, preferred, flexible
protected void CalcAlongAxis(int axis, bool isVertical)
{
- float combinedPadding = (axis == 0 ? padding.horizontal : padding.vertical);
+ float combinedPadding = (axis == 0 ? padding.horizontal : padding.vertical); // padding是left+right, top+bottom
bool controlSize = (axis == 0 ? m_ChildControlWidth : m_ChildControlHeight);
bool childForceExpandSize = (axis == 0 ? childForceExpandWidth : childForceExpandHeight);
- float totalMin = combinedPadding;
- float totalPreferred = combinedPadding;
- float totalFlexible = 0;
+ float totalMin = combinedPadding; // 所有子节点的min之和
+ float totalPreferred = combinedPadding; // 所有子节点的preferred之和
+ float totalFlexible = 0; // 是一个无单位数值，等于所有子节点的flexible值相加
bool alongOtherAxis = (isVertical ^ (axis == 1));
for (int i = 0; i < rectChildren.Count; i++)
{
RectTransform child = rectChildren[i];
- float min, preferred, flexible;
+ float min, preferred, flexible; // 子节点的三个属性值
GetChildSizes(child, axis, controlSize, childForceExpandSize, out min, out preferred, out flexible);
if (alongOtherAxis)
@@ -50,18 +52,21 @@ namespace UnityEngine.UI
}
}
+ // 减去最后一个子节点多加的spacing
if (!alongOtherAxis && rectChildren.Count > 0)
{
totalMin -= spacing;
totalPreferred -= spacing;
}
+
totalPreferred = Mathf.Max(totalMin, totalPreferred);
- SetLayoutInputForAxis(totalMin, totalPreferred, totalFlexible, axis);
+ // 保存到m_TotalMinSize, m_TotalPreferredSize, m_TotalFlexibleSize
+ SetLayoutInputForAxis(totalMin, totalPreferred, totalFlexible, axis);
}
protected void SetChildrenAlongAxis(int axis, bool isVertical)
{
- float size = rectTransform.rect.size[axis];
+ float size = rectTransform.rect.size[axis]; // RectTransform大小
bool controlSize = (axis == 0 ? m_ChildControlWidth : m_ChildControlHeight);
bool childForceExpandSize = (axis == 0 ? childForceExpandWidth : childForceExpandHeight);
float alignmentOnAxis = GetAlignmentOnAxis(axis);
@@ -69,7 +74,7 @@ namespace UnityEngine.UI
bool alongOtherAxis = (isVertical ^ (axis == 1));
if (alongOtherAxis)
{
- float innerSize = size - (axis == 0 ? padding.horizontal : padding.vertical);
+ float innerSize = size - (axis == 0 ? padding.horizontal : padding.vertical); // 容纳子节点的空间
for (int i = 0; i < rectChildren.Count; i++)
{
RectTransform child = rectChildren[i];
@@ -95,11 +100,11 @@ namespace UnityEngine.UI
if (GetTotalFlexibleSize(axis) == 0 && GetTotalPreferredSize(axis) < size)
pos = GetStartOffset(axis, GetTotalPreferredSize(axis) - (axis == 0 ? padding.horizontal : padding.vertical));
- float minMaxLerp = 0;
+ float minMaxLerp = 0; // 塞进min之后的剩余空间/preferred-min的空间，是子节点从min向preferred扩大的依据
if (GetTotalMinSize(axis) != GetTotalPreferredSize(axis))
minMaxLerp = Mathf.Clamp01((size - GetTotalMinSize(axis)) / (GetTotalPreferredSize(axis) - GetTotalMinSize(axis)));
- float itemFlexibleMultiplier = 0;
+ float itemFlexibleMultiplier = 0; // 塞进preferred之后，进一步塞满剩余空间的依据，即flexible
if (size > GetTotalPreferredSize(axis))
{
if (GetTotalFlexibleSize(axis) > 0)
@@ -116,6 +121,7 @@ namespace UnityEngine.UI
childSize += flexible * itemFlexibleMultiplier;
if (controlSize)
{
+ // 设置子节点的transform
SetChildAlongAxis(child, axis, pos, childSize);
}
else
@@ -128,12 +134,16 @@ namespace UnityEngine.UI
}
}
+ // 返回节点的min, prefered, flexible大小
+ // axis 0是x轴，1是y轴
+ // controlSize 是否勾选ChildControlSize
+ // childForceExpand 是否勾选ChildForceExpand
private void GetChildSizes(RectTransform child, int axis, bool controlSize, bool childForceExpand,
out float min, out float preferred, out float flexible)
{
- if (!controlSize)
+ if (!controlSize) // 如果没勾ChildControlSize，那么会忽略
{
- min = child.sizeDelta[axis];
+ min = child.sizeDelta[axis];//sizeDelta这里等价于size，因为动态布局系统里面anchor都是一起的
preferred = min;
flexible = 0;
}
diff --git a/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Layout/ILayoutElement.cs b/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Layout/ILayoutElement.cs
index ae11e28..d0e1510 100644
--- a/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Layout/ILayoutElement.cs
+++ b/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Layout/ILayoutElement.cs
@@ -4,15 +4,17 @@ using System.Collections;
namespace UnityEngine.UI
{
public interface ILayoutElement
- {
- // After this method is invoked, layout horizontal input properties should return up-to-date values.
- // Children will already have up-to-date layout horizontal inputs when this methods is called.
+ {
+#region LayoutGroup的派生类才会实现，其他ILayoutElement比如Image，Text不会实现
+ // After this method is invoked, layout horizontal input properties should return up-to-date values.
+ // Children will already have up-to-date layout horizontal inputs when this methods is called.
void CalculateLayoutInputHorizontal();
// After this method is invoked, layout vertical input properties should return up-to-date values.
// Children will already have up-to-date layout vertical inputs when this methods is called.
- void CalculateLayoutInputVertical();
-
- // Layout horizontal inputs
+ void CalculateLayoutInputVertical();
+#endregion
+
+ // Layout horizontal inputs
float minWidth { get; }
float preferredWidth { get; }
float flexibleWidth { get; }
diff --git a/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Layout/LayoutGroup.cs b/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Layout/LayoutGroup.cs
index 95d9f48..59d432c 100644
--- a/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Layout/LayoutGroup.cs
+++ b/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Layout/LayoutGroup.cs
@@ -39,6 +39,7 @@ namespace UnityEngine.UI
// ILayoutElement Interface
public virtual void CalculateLayoutInputHorizontal()
{
+ // 收集子节点中参与layout的节点
m_RectChildren.Clear();
var toIgnoreList = ListPool<Component>.Get();
for (int i = 0; i < rectTransform.childCount; i++)
@@ -69,6 +70,7 @@ namespace UnityEngine.UI
m_Tracker.Clear();
}
+ // 这个方法不收集是因为在CalculateLayoutInputHorizontal收集了，在LayoutRebuilder的Rebuild()方法中有注释
public abstract void CalculateLayoutInputVertical();
public virtual float minWidth { get { return GetTotalMinSize(0); } }
public virtual float preferredWidth { get { return GetTotalPreferredSize(0); } }
@@ -126,19 +128,19 @@ namespace UnityEngine.UI
protected float GetStartOffset(int axis, float requiredSpaceWithoutPadding)
{
- float requiredSpace = requiredSpaceWithoutPadding + (axis == 0 ? padding.horizontal : padding.vertical);
- float availableSpace = rectTransform.rect.size[axis];
- float surplusSpace = availableSpace - requiredSpace;
- float alignmentOnAxis = GetAlignmentOnAxis(axis);
+ float requiredSpace = requiredSpaceWithoutPadding + (axis == 0 ? padding.horizontal : padding.vertical); // 算上padding后的大小
+ float availableSpace = rectTransform.rect.size[axis]; // RectTransform大小
+ float surplusSpace = availableSpace - requiredSpace; // 剩余空间
+ float alignmentOnAxis = GetAlignmentOnAxis(axis); // 0\0.5\1
return (axis == 0 ? padding.left : padding.top) + surplusSpace * alignmentOnAxis;
}
protected float GetAlignmentOnAxis(int axis)
{
if (axis == 0)
- return ((int)childAlignment % 3) * 0.5f;
+ return ((int)childAlignment % 3) * 0.5f; // 0, 0.5, 1
else
- return ((int)childAlignment / 3) * 0.5f;
+ return ((int)childAlignment / 3) * 0.5f; // 0, 0.5, 1
}
protected void SetLayoutInputForAxis(float totalMin, float totalPreferred, float totalFlexible, int axis)
diff --git a/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Layout/LayoutRebuilder.cs b/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Layout/LayoutRebuilder.cs
index 2dc89a5..da201a7 100644
--- a/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Layout/LayoutRebuilder.cs
+++ b/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Layout/LayoutRebuilder.cs
@@ -5,7 +5,8 @@ namespace UnityEngine.UI
{
public class LayoutRebuilder : ICanvasElement
{
- private RectTransform m_ToRebuild;
+ // m_ToRebuild是一个ILayoutGroup
+ private RectTransform m_ToRebuild;
//There are a few of reasons we need to cache the Hash fromt he transform:
// - This is a ValueType (struct) and .Net calculates Hash from the Value Type fields.
// - The key of a Dictionary should have a constant Hash value.
@@ -50,6 +51,7 @@ namespace UnityEngine.UI
components.RemoveAll(e => e is Behaviour && !((Behaviour)e).isActiveAndEnabled);
}
+ // 立即重新布局一次，而不用等到帧末尾CanvasUpdateReigstry.PerformUpdate的时候
public static void ForceRebuildLayoutImmediate(RectTransform layoutRoot)
{
var rebuilder = s_Rebuilders.Get();
@@ -89,6 +91,7 @@ namespace UnityEngine.UI
// since they will be their own roots.
if (components.Count > 0)
{
+ //
// Layout control needs to executed top down with parents being done before their children,
// because the children rely on the sizes of the parents.
@@ -123,6 +126,8 @@ namespace UnityEngine.UI
// since they will be their own roots.
if (components.Count > 0 || rect.GetComponent(typeof(ILayoutGroup)))
{
+
+ // 先从子节点开始，最后到父节点，这样父节点可以得到子节点的信息
// Layout calculations needs to executed bottom up with children being done before their parents,
// because the parent calculated sizes rely on the sizes of the children.
@@ -192,6 +197,7 @@ namespace UnityEngine.UI
var rebuilder = s_Rebuilders.Get();
rebuilder.Initialize(controller);
+ // 注册进去
if (!CanvasUpdateRegistry.TryRegisterCanvasElementForLayoutRebuild(rebuilder))
s_Rebuilders.Release(rebuilder);
}
diff --git a/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Layout/LayoutUtility.cs b/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Layout/LayoutUtility.cs
index 796f35e..c58abd5 100644
--- a/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Layout/LayoutUtility.cs
+++ b/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Layout/LayoutUtility.cs
@@ -75,7 +75,7 @@ namespace UnityEngine.UI
for (int i = 0; i < components.Count; i++)
{
- var layoutComp = components[i] as ILayoutElement;
+ var layoutComp = components[i] as ILayoutElement; //
if (layoutComp is Behaviour && !((Behaviour)layoutComp).isActiveAndEnabled)
continue;
diff --git a/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Mask/Mask.cs b/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Mask/Mask.cs
index 19a5575..c67ec42 100644
--- a/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Mask/Mask.cs
+++ b/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Mask/Mask.cs
@@ -36,8 +36,7 @@ namespace UnityEngine.UI
}
}
- [NonSerialized]
- private Graphic m_Graphic;
+ [NonSerialized] private Graphic m_Graphic;
public Graphic graphic
{
get { return m_Graphic ?? (m_Graphic = GetComponent<Graphic>()); }
generated by cgit v1.1-26-g67d0 at 2025-05-20 17:04:17 +0000