1 files changed, 71 insertions, 0 deletions
diff --git a/src/platform_win/win_text_layout.cpp b/src/platform_win/win_text_layout.cpp
index 9ab70d2a..9915b56c 100644
--- a/src/platform_win/win_text_layout.cpp
+++ b/src/platform_win/win_text_layout.cpp
@@ -1,5 +1,76 @@
 #include "cru/platform/win/win_text_layout.hpp"
 
+#include "cru/platform/win/exception.hpp"
+#include "cru/platform/win/graph_manager.hpp"
+
+#include <cassert>
+#include <utility>
+
 namespace cru::platform::win {
+WinTextLayout::WinTextLayout(GraphManager* graph_manager,
+                             std::shared_ptr<WinFontDescriptor> font,
+                             std::wstring text) {
+  assert(graph_manager);
+  assert(font);
+  graph_manager_ = graph_manager;
+  text_.swap(text);
+  font_descriptor_.swap(font);
+
+  ThrowIfFailed(graph_manager_->GetDWriteFactory()->CreateTextLayout(
+      text_.c_str(), text_.size(), font_descriptor_->GetDWriteTextFormat(),
+      max_width_, max_height_, &text_layout_));
+}
+
+std::wstring WinTextLayout::GetText() { return text_; }
+
+void WinTextLayout::SetText(std::wstring new_text) {
+  text_.swap(new_text);
+  ThrowIfFailed(graph_manager_->GetDWriteFactory()->CreateTextLayout(
+      text_.c_str(), text_.size(), font_descriptor_->GetDWriteTextFormat(),
+      max_width_, max_height_, &text_layout_));
+}
+
+void WinTextLayout::SetMaxWidth(float max_width) {
+  max_width_ = max_width;
+  ThrowIfFailed(text_layout_->SetMaxWidth(max_width_));
+}
+
+void WinTextLayout::SetMaxHeight(float max_height) {
+  max_height_ = max_height;
+  ThrowIfFailed(text_layout_->SetMaxHeight(max_height_));
+}
+
+ui::Rect WinTextLayout::GetTextBounds() {
+  DWRITE_TEXT_METRICS metrics;
+  ThrowIfFailed(text_layout_->GetMetrics(&metrics));
+  return ui::Rect{metrics.left, metrics.top, metrics.width, metrics.height};
+}
+
+std::vector<ui::Rect> WinTextLayout::TextRangeRect(
+    const ui::TextRange& text_range) {
+  DWRITE_TEXT_METRICS text_metrics;
+  ThrowIfFailed(text_layout_->GetMetrics(&text_metrics));
+  const auto metrics_count =
+      text_metrics.lineCount * text_metrics.maxBidiReorderingDepth;
+
+  std::vector<DWRITE_HIT_TEST_METRICS> hit_test_metrics(metrics_count);
+  UINT32 actual_count;
+  text_layout_->HitTestTextRange(text_range.position, text_range.count, 0, 0,
+                                 hit_test_metrics.data(), metrics_count,
+                                 &actual_count);
+
+  hit_test_metrics.erase(hit_test_metrics.cbegin() + actual_count,
+                         hit_test_metrics.cend());
+
+  std::vector<ui::Rect> result;
+  result.reserve(actual_count);
+
+  for (const auto& metrics : hit_test_metrics) {
+    result.push_back(ui::Rect{metrics.left, metrics.top,
+                              metrics.left + metrics.width,
+                              metrics.top + metrics.height});
+  }
 
+  return result;
 }
+}  // namespace cru::platform::win