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#include "text_render_object.hpp"
#include <d2d1.h>
#include <dwrite.h>
#include <algorithm>
#include "exception.hpp"
#include "graph/graph_manager.hpp"
#include "graph/graph_util.hpp"
#include "util/com_util.hpp"
namespace cru::ui::render {
TextRenderObject::TextRenderObject(ID2D1Brush* brush, IDWriteTextFormat* format,
ID2D1Brush* selection_brush) {
assert(brush);
assert(format);
assert(selection_brush);
brush->AddRef();
format->AddRef();
selection_brush->AddRef();
this->brush_ = brush;
this->text_format_ = format;
this->selection_brush_ = selection_brush;
try {
RecreateTextLayout();
} catch (...) {
brush->Release();
format->Release();
selection_brush->Release();
throw;
}
}
TextRenderObject::~TextRenderObject() {
util::SafeRelease(brush_);
util::SafeRelease(text_format_);
util::SafeRelease(text_layout_);
util::SafeRelease(selection_brush_);
}
void TextRenderObject::SetBrush(ID2D1Brush* new_brush) {
assert(new_brush);
util::SafeRelease(brush_);
new_brush->AddRef();
brush_ = new_brush;
}
void TextRenderObject::SetTextFormat(IDWriteTextFormat* new_text_format) {
assert(new_text_format);
util::SafeRelease(text_format_);
new_text_format->AddRef();
text_format_ = new_text_format;
RecreateTextLayout();
}
void TextRenderObject::SetSelectionBrush(ID2D1Brush* new_brush) {
assert(new_brush);
util::SafeRelease(selection_brush_);
new_brush->AddRef();
selection_brush_ = new_brush;
}
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_, selection_brush_, selection_range_);
rt->DrawTextLayout(D2D1::Point2F(), text_layout_, brush_);
});
}
RenderObject* TextRenderObject::HitTest(const Point& point) {
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 TextRenderObject::OnSizeChanged(const Size& old_size,
const Size& new_size) {
const auto margin = GetMargin();
const auto padding = GetPadding();
ThrowIfFailed(text_layout_->SetMaxWidth(
std::max(new_size.width - margin.GetHorizontalTotal() -
padding.GetHorizontalTotal(),
0.0f)));
ThrowIfFailed(text_layout_->SetMaxHeight(std::max(
new_size.height - margin.GetVerticalTotal() - padding.GetVerticalTotal(),
0.0f)));
}
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);
util::SafeRelease(text_layout_);
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_,
size.width, size.height, &text_layout_));
}
} // namespace cru::ui::render
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