6 files changed, 75 insertions, 9 deletions
diff --git a/src/ui/render/BorderRenderObject.cpp b/src/ui/render/BorderRenderObject.cpp
index 8e93e205..1392af1e 100644
--- a/src/ui/render/BorderRenderObject.cpp
+++ b/src/ui/render/BorderRenderObject.cpp
@@ -6,6 +6,7 @@
 #include "cru/platform/graphics/Geometry.h"
 #include "cru/platform/graphics/Painter.h"
 #include "cru/ui/DebugFlags.h"
+#include "cru/ui/render/RenderObject.h"
 
 #include <algorithm>
 
@@ -122,6 +123,13 @@ Size BorderRenderObject::OnMeasureContent(const MeasureRequirement& requirement,
   }
 }
 
+Size BorderRenderObject::OnMeasureContent1(const BoxConstraint& constraint) {
+  auto child = GetChild();
+  if (child == nullptr) return constraint.min;
+  auto child_size = child->Measure1(BoxConstraint::kNotLimit);
+  return constraint.Coerce(child_size);
+}
+
 void BorderRenderObject::OnLayoutContent(const Rect& content_rect) {
   if (auto child = GetChild()) {
     child->Layout(content_rect.GetLeftTop());
diff --git a/src/ui/render/CanvasRenderObject.cpp b/src/ui/render/CanvasRenderObject.cpp
index 431b8f56..e0f1726b 100644
--- a/src/ui/render/CanvasRenderObject.cpp
+++ b/src/ui/render/CanvasRenderObject.cpp
@@ -1,7 +1,7 @@
 #include "cru/ui/render/CanvasRenderObject.h"
 
 namespace cru::ui::render {
-CanvasRenderObject::CanvasRenderObject()  {}
+CanvasRenderObject::CanvasRenderObject() {}
 
 CanvasRenderObject::~CanvasRenderObject() = default;
 
@@ -22,6 +22,10 @@ Size CanvasRenderObject::OnMeasureContent(const MeasureRequirement& requirement,
                                  preferred_size.height.GetLengthOr(100)});
 }
 
+Size CanvasRenderObject::OnMeasureContent1(const BoxConstraint& constraint) {
+  return constraint.Coerce(Size{100, 100});
+}
+
 void CanvasRenderObject::OnLayoutContent(const Rect& content_rect) {
   CRU_UNUSED(content_rect)
 }
diff --git a/src/ui/render/GeometryRenderObject.cpp b/src/ui/render/GeometryRenderObject.cpp
index ea9b6e11..07c5b911 100644
--- a/src/ui/render/GeometryRenderObject.cpp
+++ b/src/ui/render/GeometryRenderObject.cpp
@@ -106,5 +106,9 @@ Size GeometryRenderObject::OnMeasureContent(
   return requirement.Coerce(result);
 }
 
+Size GeometryRenderObject::OnMeasureContent1(const BoxConstraint& constraint) {
+  return constraint.Coerce(GetViewPort().GetSize());
+}
+
 void GeometryRenderObject::OnLayoutContent(const Rect& content_rect) {}
 }  // namespace cru::ui::render
diff --git a/src/ui/render/RenderObject.cpp b/src/ui/render/RenderObject.cpp
index 8904f0dc..a370f749 100644
--- a/src/ui/render/RenderObject.cpp
+++ b/src/ui/render/RenderObject.cpp
@@ -84,6 +84,32 @@ void RenderObject::SetMaxSize1(const Size& max_size) {
   InvalidateLayout();
 }
 
+BoxConstraint RenderObject::CalculateMergedConstraint(
+    const BoxConstraint& constraint) const {
+  auto result = constraint;
+  if (max_size_.width >= constraint.min.width &&
+      max_size_.width < constraint.max.width) {
+    result.max.width = max_size_.width;
+  }
+
+  if (max_size_.height >= constraint.min.height &&
+      max_size_.height < constraint.max.height) {
+    result.max.height = max_size_.height;
+  }
+
+  if (min_size_.width <= constraint.max.width &&
+      min_size_.width > constraint.min.width) {
+    result.min.width = min_size_.width;
+  }
+
+  if (min_size_.height <= constraint.max.height &&
+      min_size_.height > constraint.min.height) {
+    result.min.height = min_size_.height;
+  }
+
+  return result;
+}
+
 void RenderObject::Measure(const MeasureRequirement& requirement,
                            const MeasureSize& preferred_size) {
   MeasureRequirement merged_requirement =
@@ -109,9 +135,11 @@ void RenderObject::Measure(const MeasureRequirement& requirement,
   Ensures(desired_size_.height >= 0);
 }
 
-void RenderObject::Measure1(const BoxConstraint& constraint) {
+Size RenderObject::Measure1(const BoxConstraint& constraint) {
   Expects(constraint.Validate());
   desired_size_ = OnMeasureCore1(constraint);
+  Ensures(constraint.Satisfy(desired_size_));
+  return desired_size_;
 }
 
 void RenderObject::Layout(const Point& offset) {
@@ -156,24 +184,26 @@ Size RenderObject::OnMeasureCore(const MeasureRequirement& requirement,
 }
 
 Size RenderObject::OnMeasureCore1(const BoxConstraint& constraint) {
+  auto merged_constraint = CalculateMergedConstraint(constraint);
+
   const Thickness outer_space = GetTotalSpaceThickness();
   Size space_size{outer_space.GetHorizontalTotal(),
                   outer_space.GetVerticalTotal()};
 
-  if (space_size.width > constraint.max.width) {
-    space_size.width = constraint.max.width;
+  if (space_size.width > merged_constraint.max.width) {
+    space_size.width = merged_constraint.max.width;
     CRU_LOG_WARN(u"{} space width is over constraint.max.width",
                  this->GetDebugPathInTree());
   }
 
-  if (space_size.height > constraint.max.height) {
-    space_size.height = constraint.max.height;
+  if (space_size.height > merged_constraint.max.height) {
+    space_size.height = merged_constraint.max.height;
     CRU_LOG_WARN(u"{} space height is over constraint.max.height",
                  this->GetDebugPathInTree());
   }
 
-  BoxConstraint content_constraint{constraint.max - space_size,
-                                   constraint.min - space_size};
+  BoxConstraint content_constraint{merged_constraint.max - space_size,
+                                   merged_constraint.min - space_size};
 
   const auto content_size = OnMeasureContent1(content_constraint);
 
diff --git a/src/ui/render/ScrollRenderObject.cpp b/src/ui/render/ScrollRenderObject.cpp
index 03bb1a2d..b8b6904d 100644
--- a/src/ui/render/ScrollRenderObject.cpp
+++ b/src/ui/render/ScrollRenderObject.cpp
@@ -2,6 +2,7 @@
 
 #include "cru/platform/graphics/Painter.h"
 #include "cru/ui/controls/Control.h"
+#include "cru/ui/render/RenderObject.h"
 #include "cru/ui/render/ScrollBar.h"
 
 #include <algorithm>
@@ -185,7 +186,14 @@ Size ScrollRenderObject::OnMeasureContent(const MeasureRequirement& requirement,
                     : requirement.min.height.GetLengthOr0()};
     return result;
   }
-}  // namespace cru::ui::render
+}
+
+Size ScrollRenderObject::OnMeasureContent1(const BoxConstraint& constraint) {
+  auto child = GetChild();
+  if (child == nullptr) return constraint.min;
+  auto child_size = child->Measure1(BoxConstraint::kNotLimit);
+  return constraint.Coerce(child_size);
+}
 
 void ScrollRenderObject::OnLayoutContent(const Rect& content_rect) {
   if (auto child = GetChild()) {
diff --git a/src/ui/render/TextRenderObject.cpp b/src/ui/render/TextRenderObject.cpp
index 0b9009c5..11548106 100644
--- a/src/ui/render/TextRenderObject.cpp
+++ b/src/ui/render/TextRenderObject.cpp
@@ -6,6 +6,7 @@
 #include "cru/platform/graphics/Painter.h"
 #include "cru/platform/graphics/TextLayout.h"
 #include "cru/ui/DebugFlags.h"
+#include "cru/ui/render/RenderObject.h"
 
 #include <algorithm>
 #include <limits>
@@ -226,6 +227,17 @@ Size TextRenderObject::OnMeasureContent(const MeasureRequirement& requirement,
   return result;
 }
 
+Size TextRenderObject::OnMeasureContent1(const BoxConstraint& constraint) {
+  text_layout_->SetMaxWidth(constraint.max.width);
+  text_layout_->SetMaxHeight(std::numeric_limits<float>::max());
+
+  const Size text_size(
+      text_layout_->GetTextBounds(is_measure_including_trailing_space_)
+          .GetRightBottom());
+
+  return constraint.Coerce(text_size);
+}
+
 void TextRenderObject::OnLayoutContent(const Rect& content_rect) {
   CRU_UNUSED(content_rect)
 }