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1 files changed, 190 insertions, 0 deletions

diff --git a/src/ui/render/RenderObject.cpp b/src/ui/render/RenderObject.cpp
new file mode 100644
index 00000000..83e306a8
--- /dev/null
+++ b/src/ui/render/RenderObject.cpp
@@ -0,0 +1,190 @@
+#include "cru/ui/render/RenderObject.hpp"
+
+#include "cru/common/Logger.hpp"
+#include "cru/ui/UiHost.hpp"
+
+#include <algorithm>
+
+namespace cru::ui::render {
+void RenderObject::AddChild(RenderObject* render_object, const Index position) {
+  Expects(child_mode_ != ChildMode::None);
+  Expects(!(child_mode_ == ChildMode::Single && children_.size() > 0));
+
+  Expects(render_object->GetParent() ==
+          nullptr);        // Render object already has a parent.
+  Expects(position >= 0);  // Position index is less than 0.
+  Expects(
+      position <=
+      static_cast<Index>(children_.size()));  // Position index is out of bound.
+
+  children_.insert(children_.cbegin() + position, render_object);
+  render_object->SetParent(this);
+  render_object->SetRenderHostRecursive(GetUiHost());
+  OnAddChild(render_object, position);
+}
+
+void RenderObject::RemoveChild(const Index position) {
+  Expects(position >= 0);  // Position index is less than 0.
+  Expects(position < static_cast<Index>(
+                         children_.size()));  // Position index is out of bound.
+
+  const auto i = children_.cbegin() + position;
+  const auto removed_child = *i;
+  children_.erase(i);
+  removed_child->SetParent(nullptr);
+  removed_child->SetRenderHostRecursive(nullptr);
+  OnRemoveChild(removed_child, position);
+}
+
+Point RenderObject::GetTotalOffset() const {
+  Point result{};
+  const RenderObject* render_object = this;
+
+  while (render_object != nullptr) {
+    const auto o = render_object->GetOffset();
+    result.x += o.x;
+    result.y += o.y;
+    render_object = render_object->GetParent();
+  }
+
+  return result;
+}
+
+Point RenderObject::FromRootToContent(const Point& point) const {
+  const auto offset = GetTotalOffset();
+  const auto rect = GetContentRect();
+  return Point{point.x - (offset.x + rect.left),
+               point.y - (offset.y + rect.top)};
+}
+
+void RenderObject::Measure(const Size& available_size) {
+  OnMeasureCore(available_size);
+}
+
+void RenderObject::Layout(const Rect& rect) {
+  SetOffset(rect.GetLeftTop());
+  SetSize(rect.GetSize());
+  OnLayoutCore(Rect{Point{}, rect.GetSize()});
+}
+
+void RenderObject::OnParentChanged(RenderObject* old_parent,
+                                   RenderObject* new_parent) {
+  CRU_UNUSED(old_parent)
+  CRU_UNUSED(new_parent)
+}
+
+void RenderObject::OnAddChild(RenderObject* new_child, Index position) {
+  CRU_UNUSED(new_child)
+  CRU_UNUSED(position)
+
+  InvalidateLayout();
+  InvalidatePaint();
+}
+
+void RenderObject::OnRemoveChild(RenderObject* removed_child, Index position) {
+  CRU_UNUSED(removed_child)
+  CRU_UNUSED(position)
+
+  InvalidateLayout();
+  InvalidatePaint();
+}
+
+void RenderObject::OnMeasureCore(const Size& available_size) {
+  Size margin_padding_size{
+      margin_.GetHorizontalTotal() + padding_.GetHorizontalTotal(),
+      margin_.GetVerticalTotal() + padding_.GetVerticalTotal()};
+
+  auto coerced_margin_padding_size = margin_padding_size;
+  if (coerced_margin_padding_size.width > available_size.width) {
+    log::Warn(
+        "Measure: horizontal length of padding and margin is bigger than "
+        "available length.");
+    coerced_margin_padding_size.width = available_size.width;
+  }
+  if (coerced_margin_padding_size.height > available_size.height) {
+    log::Warn(
+        "Measure: vertical length of padding and margin is bigger than "
+        "available length.");
+    coerced_margin_padding_size.height = available_size.height;
+  }
+
+  const auto coerced_content_available_size =
+      available_size - coerced_margin_padding_size;
+  const auto actual_content_size =
+      OnMeasureContent(coerced_content_available_size);
+
+  SetPreferredSize(coerced_margin_padding_size + actual_content_size);
+}
+
+void RenderObject::OnLayoutCore(const Rect& rect) {
+  Size margin_padding_size{
+      margin_.GetHorizontalTotal() + padding_.GetHorizontalTotal(),
+      margin_.GetVerticalTotal() + padding_.GetVerticalTotal()};
+  const auto content_available_size = rect.GetSize() - margin_padding_size;
+  auto coerced_content_available_size = content_available_size;
+
+  if (coerced_content_available_size.width < 0) {
+    log::Warn(
+        "Layout: horizontal length of padding and margin is bigger than "
+        "available length.");
+    coerced_content_available_size.width = 0;
+  }
+  if (coerced_content_available_size.height < 0) {
+    log::Warn(
+        "Layout: vertical length of padding and margin is bigger than "
+        "available length.");
+    coerced_content_available_size.height = 0;
+  }
+
+  OnLayoutContent(Rect{margin_.left + padding_.left, margin_.top + padding_.top,
+                       coerced_content_available_size.width,
+                       coerced_content_available_size.height});
+}
+
+void RenderObject::OnAfterLayout() {}
+
+Rect RenderObject::GetPaddingRect() const {
+  Rect rect{Point{}, GetSize()};
+  rect = rect.Shrink(GetMargin());
+  rect.width = std::max(rect.width, 0.0f);
+  rect.height = std::max(rect.height, 0.0f);
+  return rect;
+}
+
+Rect RenderObject::GetContentRect() const {
+  Rect rect{Point{}, GetSize()};
+  rect = rect.Shrink(GetMargin());
+  rect = rect.Shrink(GetPadding());
+  rect.width = std::max(rect.width, 0.0f);
+  rect.height = std::max(rect.height, 0.0f);
+  return rect;
+}
+
+void RenderObject::SetParent(RenderObject* new_parent) {
+  const auto old_parent = parent_;
+  parent_ = new_parent;
+  OnParentChanged(old_parent, new_parent);
+}
+
+void RenderObject::InvalidateLayout() {
+  if (ui_host_ != nullptr) ui_host_->InvalidateLayout();
+}
+
+void RenderObject::InvalidatePaint() {
+  if (ui_host_ != nullptr) ui_host_->InvalidatePaint();
+}
+
+void RenderObject::NotifyAfterLayoutRecursive(RenderObject* render_object) {
+  render_object->OnAfterLayout();
+  for (const auto o : render_object->GetChildren()) {
+    NotifyAfterLayoutRecursive(o);
+  }
+}
+
+void RenderObject::SetRenderHostRecursive(UiHost* host) {
+  ui_host_ = host;
+  for (const auto child : GetChildren()) {
+    child->SetRenderHostRecursive(host);
+  }
+}
+}  // namespace cru::ui::render