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#include "text_block.h"
#include <chrono>
#include "ui/window.h"
#include "graph/graph.h"
#include "exception.h"
#include "debug_base.h"
namespace cru
{
namespace ui
{
namespace controls
{
inline Microsoft::WRL::ComPtr<IDWriteFactory> GetDWriteFactory()
{
return graph::GraphManager::GetInstance()->GetDWriteFactory();
}
TextBlock::TextBlock(const Microsoft::WRL::ComPtr<IDWriteTextFormat>& init_text_format,
const Microsoft::WRL::ComPtr<ID2D1Brush>& init_brush) : Control(false)
{
text_format_ = init_text_format;
if (init_brush == nullptr)
CreateDefaultBrush();
}
TextBlock::~TextBlock() = default;
void TextBlock::SetText(const String& text)
{
if (text_ != text)
{
const auto old_text = text_;
text_ = text;
OnTextChangedCore(old_text, text);
}
}
void TextBlock::SetBrush(const Microsoft::WRL::ComPtr<ID2D1Brush>& brush)
{
brush_ = brush;
Repaint();
}
void TextBlock::SetTextFormat(const Microsoft::WRL::ComPtr<IDWriteTextFormat>& text_format)
{
text_format_ = text_format;
RecreateTextLayout();
Repaint();
}
void TextBlock::OnSizeChangedCore(events::SizeChangedEventArgs& args)
{
text_layout_->SetMaxWidth(args.GetNewSize().width);
text_layout_->SetMaxHeight(args.GetNewSize().height);
Repaint();
Control::OnSizeChangedCore(args);
}
void TextBlock::OnDraw(ID2D1DeviceContext* device_context)
{
if (text_layout_ != nullptr)
device_context->DrawTextLayout(D2D1::Point2F(), text_layout_.Get(), brush_.Get());
}
void TextBlock::OnMouseDownCore(events::MouseButtonEventArgs& args)
{
if (args.GetMouseButton() == MouseButton::Left)
{
BOOL is_trailing, is_inside;
DWRITE_HIT_TEST_METRICS metrics;
text_layout_->HitTestPoint(args.GetPoint(this).x, args.GetPoint(this).y, &is_trailing, &is_inside, &metrics);
if (is_inside)
{
mouse_down_position_ = is_trailing == 0 ? metrics.textPosition : metrics.textPosition + 1;
is_mouse_down_ = true;
}
}
Control::OnMouseDownCore(args);
}
Size TextBlock::OnMeasure(const Size& available_size)
{
if (text_.empty())
return Size::zero;
const auto layout_params = GetLayoutParams();
if (layout_params->width.mode == MeasureMode::Stretch && layout_params->height.mode == MeasureMode::Stretch)
return available_size;
auto&& get_measure_length = [](const MeasureLength& layout_length, const float available_length) -> float
{
switch (layout_length.mode)
{
case MeasureMode::Exactly:
{
return std::min(layout_length.length, available_length);
}
case MeasureMode::Stretch:
case MeasureMode::Content:
{
return available_length;
}
default:
UnreachableCode();
}
};
const Size measure_size(get_measure_length(layout_params->width, available_size.width),
get_measure_length(layout_params->height, available_size.height));
ThrowIfFailed(text_layout_->SetMaxWidth(measure_size.width));
ThrowIfFailed(text_layout_->SetMaxHeight(measure_size.height));
DWRITE_TEXT_METRICS metrics{};
ThrowIfFailed(text_layout_->GetMetrics(&metrics));
const Size measure_result(metrics.width, metrics.height);
auto&& calculate_final_length = [](const MeasureLength& layout_length, const float measure_length, const float measure_result_length) -> float
{
if ((layout_length.mode == MeasureMode::Stretch ||
layout_length.mode == MeasureMode::Exactly)
&& measure_result_length < measure_length)
return measure_length;
else
return measure_result_length;
};
const Size result_size(
calculate_final_length(layout_params->width, measure_size.width, measure_result.width),
calculate_final_length(layout_params->height, measure_size.height, measure_result.height)
);
return result_size;
}
void TextBlock::OnTextChangedCore(const String& old_text, const String& new_text)
{
RecreateTextLayout();
Repaint();
}
void TextBlock::CreateDefaultBrush()
{
const auto device_context = graph::GraphManager::GetInstance()->GetD2D1DeviceContext();
Microsoft::WRL::ComPtr<ID2D1SolidColorBrush> solid_color_brush;
device_context->CreateSolidColorBrush(D2D1::ColorF(D2D1::ColorF::Black), &solid_color_brush);
brush_ = solid_color_brush;
}
void TextBlock::CreateDefaultTextFormat()
{
const auto dwrite_factory = GetDWriteFactory();
ThrowIfFailed(dwrite_factory->CreateTextFormat(
L"����", nullptr,
DWRITE_FONT_WEIGHT_NORMAL,
DWRITE_FONT_STYLE_NORMAL,
DWRITE_FONT_STRETCH_NORMAL,
24.0, L"zh-cn",
&text_format_
));
}
void TextBlock::RecreateTextLayout()
{
if (text_.empty())
{
text_layout_ = nullptr;
return;
}
const auto dwrite_factory = GetDWriteFactory();
if (text_format_ == nullptr)
CreateDefaultTextFormat();
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_
));
std::for_each(text_layout_handlers_.cbegin(), text_layout_handlers_.cend(), [this](const std::shared_ptr<TextLayoutHandler>& handler)
{
(*handler)(text_layout_);
});
}
}
}
}
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