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1 files changed, 236 insertions, 0 deletions

diff --git a/src/ui/render/BorderRenderObject.cpp b/src/ui/render/BorderRenderObject.cpp
new file mode 100644
index 00000000..a656cb99
--- /dev/null
+++ b/src/ui/render/BorderRenderObject.cpp
@@ -0,0 +1,236 @@
+#include "cru/ui/render/BorderRenderObject.hpp"
+
+#include "../Helper.hpp"
+#include "cru/common/Logger.hpp"
+#include "cru/platform/graph/Factory.hpp"
+#include "cru/platform/graph/Geometry.hpp"
+#include "cru/platform/graph/util/Painter.hpp"
+
+#include <algorithm>
+
+namespace cru::ui::render {
+BorderRenderObject::BorderRenderObject() {
+  SetChildMode(ChildMode::Single);
+  RecreateGeometry();
+}
+
+BorderRenderObject::~BorderRenderObject() {}
+
+void BorderRenderObject::Draw(platform::graph::IPainter* painter) {
+  if (background_brush_ != nullptr)
+    painter->FillGeometry(border_inner_geometry_.get(),
+                          background_brush_.get());
+  if (is_border_enabled_) {
+    if (border_brush_ == nullptr) {
+      log::Warn("Border is enabled but brush is null");
+    } else {
+      painter->FillGeometry(geometry_.get(), border_brush_.get());
+    }
+  }
+  if (const auto child = GetChild()) {
+    auto offset = child->GetOffset();
+    platform::graph::util::WithTransform(
+        painter, platform::Matrix::Translation(offset.x, offset.y),
+        [child](auto p) { child->Draw(p); });
+  }
+  if (foreground_brush_ != nullptr)
+    painter->FillGeometry(border_inner_geometry_.get(),
+                          foreground_brush_.get());
+}
+
+void BorderRenderObject::SetBorderStyle(const BorderStyle& style) {
+  border_brush_ = style.border_brush;
+  border_thickness_ = style.border_thickness;
+  border_radius_ = style.border_radius;
+  foreground_brush_ = style.foreground_brush;
+  background_brush_ = style.background_brush;
+  InvalidateLayout();
+}
+
+RenderObject* BorderRenderObject::HitTest(const Point& point) {
+  if (const auto child = GetChild()) {
+    auto offset = child->GetOffset();
+    Point p{point.x - offset.x, point.y - offset.y};
+    const auto result = child->HitTest(p);
+    if (result != nullptr) {
+      return result;
+    }
+  }
+
+  if (is_border_enabled_) {
+    const auto contains =
+        border_outer_geometry_->FillContains(Point{point.x, point.y});
+    return contains ? this : nullptr;
+  } else {
+    const auto margin = GetMargin();
+    const auto size = GetSize();
+    return Rect{margin.left, margin.top,
+                std::max(size.width - margin.GetHorizontalTotal(), 0.0f),
+                std::max(size.height - margin.GetVerticalTotal(), 0.0f)}
+                   .IsPointInside(point)
+               ? this
+               : nullptr;
+  }
+}
+
+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_border_enabled_) {
+    margin_border_padding_size.width += border_thickness_.GetHorizontalTotal();
+    margin_border_padding_size.height += border_thickness_.GetVerticalTotal();
+  }
+
+  auto coerced_margin_border_padding_size = margin_border_padding_size;
+  if (coerced_margin_border_padding_size.width > available_size.width) {
+    log::Warn(
+        "Measure: horizontal length of padding, border and margin is bigger "
+        "than available length.");
+    coerced_margin_border_padding_size.width = available_size.width;
+  }
+  if (coerced_margin_border_padding_size.height > available_size.height) {
+    log::Warn(
+        "Measure: vertical length of padding, border and margin is bigger "
+        "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_border_enabled_) {
+    margin_border_padding_size.width += border_thickness_.GetHorizontalTotal();
+    margin_border_padding_size.height += border_thickness_.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) {
+    log::Warn(
+        "Layout: horizontal length of padding, border 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, border and margin is bigger "
+        "than available length.");
+    coerced_content_available_size.height = 0;
+  }
+
+  OnLayoutContent(
+      Rect{margin.left + (is_border_enabled_ ? border_thickness_.left : 0) +
+               padding.left,
+           margin.top + (is_border_enabled_ ? border_thickness_.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{};
+  }
+}
+
+void BorderRenderObject::OnLayoutContent(const Rect& content_rect) {
+  const auto child = GetChild();
+  if (child) {
+    child->Layout(content_rect);
+  }
+}
+
+void BorderRenderObject::OnAfterLayout() { RecreateGeometry(); }
+
+void BorderRenderObject::RecreateGeometry() {
+  geometry_.reset();
+  border_outer_geometry_.reset();
+
+  Thickness t = border_thickness_;
+  t.left /= 2.0;
+  t.top /= 2.0;
+  t.right /= 2.0;
+  t.bottom /= 2.0;
+  const CornerRadius& r = border_radius_;
+
+  CornerRadius outer_radius(r.left_top + Point{t.left, t.top},
+                            r.right_top + Point{t.right, t.top},
+                            r.left_bottom + Point{t.left, t.bottom},
+                            r.right_bottom + Point{t.right, t.bottom});
+
+  CornerRadius inner_radius(r.left_top - Point{t.left, t.top},
+                            r.right_top - Point{t.right, t.top},
+                            r.left_bottom - Point{t.left, t.bottom},
+                            r.right_bottom - Point{t.right, t.bottom});
+
+  auto f = [](platform::graph::IGeometryBuilder* builder, const Rect& rect,
+              const CornerRadius& corner) {
+    builder->BeginFigure(Point(rect.left + corner.left_top.x, rect.top));
+    builder->LineTo(Point(rect.GetRight() - corner.right_top.x, rect.top));
+    builder->QuadraticBezierTo(
+        Point(rect.GetRight(), rect.top),
+        Point(rect.GetRight(), rect.top + corner.right_top.y));
+    builder->LineTo(
+        Point(rect.GetRight(), rect.GetBottom() - corner.right_bottom.y));
+    builder->QuadraticBezierTo(
+        Point(rect.GetRight(), rect.GetBottom()),
+        Point(rect.GetRight() - corner.right_bottom.x, rect.GetBottom()));
+    builder->LineTo(Point(rect.left + corner.left_bottom.x, rect.GetBottom()));
+    builder->QuadraticBezierTo(
+        Point(rect.left, rect.GetBottom()),
+        Point(rect.left, rect.GetBottom() - corner.left_bottom.y));
+    builder->LineTo(Point(rect.left, rect.top + corner.left_top.y));
+    builder->QuadraticBezierTo(Point(rect.left, rect.top),
+                               Point(rect.left + corner.left_top.x, rect.top));
+    builder->CloseFigure(true);
+  };
+
+  const auto size = GetSize();
+  const auto margin = GetMargin();
+  const Rect outer_rect{margin.left, margin.top,
+                        size.width - margin.GetHorizontalTotal(),
+                        size.height - margin.GetVerticalTotal()};
+  const auto graph_factory = GetGraphFactory();
+  std::unique_ptr<platform::graph::IGeometryBuilder> builder{
+      graph_factory->CreateGeometryBuilder()};
+  f(builder.get(), outer_rect, outer_radius);
+  border_outer_geometry_ = builder->Build();
+  builder.reset();
+
+  const Rect inner_rect = outer_rect.Shrink(border_thickness_);
+
+  builder = graph_factory->CreateGeometryBuilder();
+  f(builder.get(), inner_rect, inner_radius);
+  border_inner_geometry_ = builder->Build();
+  builder.reset();
+
+  builder = graph_factory->CreateGeometryBuilder();
+  f(builder.get(), outer_rect, outer_radius);
+  f(builder.get(), inner_rect, inner_radius);
+  geometry_ = builder->Build();
+  builder.reset();
+}
+}  // namespace cru::ui::render