From 7f1acd3ab4bddf6c61551ebc867667fbdd3ad7b8 Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Wed, 20 Mar 2019 18:14:07 +0800
Subject: ...

---
 src/ui/render/text_render_object.cpp | 91 ++++++++++++++++++++++++++++++++++++
 1 file changed, 91 insertions(+)
 create mode 100644 src/ui/render/text_render_object.cpp

(limited to 'src/ui/render/text_render_object.cpp')

diff --git a/src/ui/render/text_render_object.cpp b/src/ui/render/text_render_object.cpp
new file mode 100644
index 00000000..43724e9f
--- /dev/null
+++ b/src/ui/render/text_render_object.cpp
@@ -0,0 +1,91 @@
+#include "text_render_object.hpp"
+
+#include <cassert>
+
+#include "exception.hpp"
+#include "graph/graph.hpp"
+
+namespace cru::ui::render {
+TextRenderObject::TextRenderObject(
+    Microsoft::WRL::ComPtr<ID2D1Brush> brush,
+    Microsoft::WRL::ComPtr<IDWriteTextFormat> format,
+    Microsoft::WRL::ComPtr<ID2D1Brush> selection_brush)
+    : brush_(std::move(brush)),
+      text_format_(std::move(format)),
+      selection_brush_(std::move(selection_brush)) {
+  RecreateTextLayout();
+}
+
+namespace {
+void DrawSelectionRect(ID2D1RenderTarget* render_target,
+                       IDWriteTextLayout* layout, ID2D1Brush* brush,
+                       const std::optional<TextRange> range) {
+  if (range.has_value()) {
+    DWRITE_TEXT_METRICS text_metrics{};
+    ThrowIfFailed(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;
+    layout->HitTestTextRange(range.value().position, range.value().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());
+
+    for (const auto& metrics : hit_test_metrics)
+      render_target->FillRoundedRectangle(
+          D2D1::RoundedRect(D2D1::RectF(metrics.left, metrics.top,
+                                        metrics.left + metrics.width,
+                                        metrics.top + metrics.height),
+                            3, 3),
+          brush);
+  }
+}
+}  // namespace
+
+void TextRenderObject::Draw(ID2D1RenderTarget* render_target) {
+  graph::WithTransform(
+      render_target,
+      D2D1::Matrix3x2F::Translation(GetMargin().left + GetPadding().left,
+                                    GetMargin().top + GetPadding().top),
+      [this](auto rt) {
+        DrawSelectionRect(rt, text_layout_.Get(), selection_brush_.Get(),
+                          selection_range_);
+        rt->DrawTextLayout(D2D1::Point2F(), text_layout_.Get(), brush_.Get());
+      });
+}
+
+RenderObject* TextRenderObject::HitTest(const Point& point) {
+  return Rect{Point::Zero(), GetSize()}.IsPointInside(point) ? this : nullptr;
+}
+
+Size TextRenderObject::OnMeasureContent(const Size& available_size) {
+  ThrowIfFailed(text_layout_->SetMaxWidth(available_size.width));
+  ThrowIfFailed(text_layout_->SetMaxHeight(available_size.height));
+
+  DWRITE_TEXT_METRICS metrics;
+  ThrowIfFailed(text_layout_->GetMetrics(&metrics));
+
+  return Size(metrics.width, metrics.height);
+}
+
+void TextRenderObject::OnLayoutContent(const Rect& content_rect) {}
+
+void TextRenderObject::RecreateTextLayout() {
+  assert(text_format_ != nullptr);
+
+  text_layout_ = nullptr;  // release last one
+
+  const auto dwrite_factory =
+      graph::GraphManager::GetInstance()->GetDWriteFactory();
+
+  const auto&& size = GetSize();
+
+  ThrowIfFailed(dwrite_factory->CreateTextLayout(
+      text_.c_str(), static_cast<UINT32>(text_.size()), text_format_.Get(),
+      size.width, size.height, &text_layout_));
+}
+}  // namespace cru::ui::render
-- 
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