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1 files changed, 96 insertions, 0 deletions

diff --git a/src/ui/render/border_render_object.cpp b/src/ui/render/border_render_object.cpp
new file mode 100644
index 00000000..c98d6c29
--- /dev/null
+++ b/src/ui/render/border_render_object.cpp
@@ -0,0 +1,96 @@
+#include "border_render_object.hpp"
+
+#include "cru_debug.hpp"
+
+namespace cru::ui::render {
+BorderRenderObject::BorderRenderObject(Microsoft::WRL::ComPtr<ID2D1Brush> brush)
+    : border_brush_(std::move(brush)) {}
+
+void BorderRenderObject::OnMeasureCore(const Size& available_size) {
+  const auto margin = GetMargin();
+  const auto padding = GetPadding();
+  Size margin_border_padding_size{
+      margin.GetHorizontalTotal() + padding.GetHorizontalTotal(),
+      margin.GetVerticalTotal() + padding.GetVerticalTotal()};
+
+  if (is_enabled_) {
+    margin_border_padding_size.width += border_width_.GetHorizontalTotal();
+    margin_border_padding_size.height += border_width_.GetVerticalTotal();
+  }
+
+  auto coerced_margin_border_padding_size = margin_border_padding_size;
+  if (coerced_margin_border_padding_size.width > available_size.width) {
+    debug::DebugMessage(
+        L"Measure: horizontal length of padding, border and margin is bigger "
+        L"than available length.");
+    coerced_margin_border_padding_size.width = available_size.width;
+  }
+  if (coerced_margin_border_padding_size.height > available_size.height) {
+    debug::DebugMessage(
+        L"Measure: vertical length of padding, border and margin is bigger "
+        L"than available length.");
+    coerced_margin_border_padding_size.height = available_size.height;
+  }
+
+  const auto coerced_content_available_size =
+      available_size - coerced_margin_border_padding_size;
+
+  const auto actual_content_size =
+      OnMeasureContent(coerced_content_available_size);
+
+  SetPreferredSize(coerced_margin_border_padding_size + actual_content_size);
+}
+
+void BorderRenderObject::OnLayoutCore(const Rect& rect) {
+  const auto margin = GetMargin();
+  const auto padding = GetPadding();
+  Size margin_border_padding_size{
+      margin.GetHorizontalTotal() + padding.GetHorizontalTotal(),
+      margin.GetVerticalTotal() + padding.GetVerticalTotal()};
+
+  if (is_enabled_) {
+    margin_border_padding_size.width += border_width_.GetHorizontalTotal();
+    margin_border_padding_size.height += border_width_.GetVerticalTotal();
+  }
+
+  const auto content_available_size =
+      rect.GetSize() - margin_border_padding_size;
+  auto coerced_content_available_size = content_available_size;
+
+  if (coerced_content_available_size.width < 0) {
+    debug::DebugMessage(
+        L"Layout: horizontal length of padding, border and margin is bigger "
+        L"than available length.");
+    coerced_content_available_size.width = 0;
+  }
+  if (coerced_content_available_size.height < 0) {
+    debug::DebugMessage(
+        L"Layout: vertical length of padding, border and margin is bigger than "
+        L"available length.");
+    coerced_content_available_size.height = 0;
+  }
+
+  OnLayoutContent(
+      Rect{margin.left + (is_enabled_ ? border_width_.left : 0) + padding.left,
+           margin.top + (is_enabled_ ? border_width_.top : 0) + padding.top,
+           coerced_content_available_size.width,
+           coerced_content_available_size.height});
+}
+
+Size BorderRenderObject::OnMeasureContent(const Size& available_size) {
+  const auto child = GetChild();
+  if (child) {
+    child->Measure(available_size);
+    return child->GetPreferredSize();
+  } else {
+    return Size::Zero();
+  }
+}
+
+void BorderRenderObject::OnLayoutContent(const Rect& content_rect) {
+  const auto child = GetChild();
+  if (child) {
+    child->Layout(content_rect);
+  }
+}
+}  // namespace cru::ui::render