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#include "text_box.h"
#include <cwctype>
#include "graph/graph.h"
#include "exception.h"
namespace cru::ui::controls
{
using graph::CreateSolidBrush;
inline Microsoft::WRL::ComPtr<IDWriteFactory> GetDWriteFactory()
{
return graph::GraphManager::GetInstance()->GetDWriteFactory();
}
TextBox::TextBox(const Microsoft::WRL::ComPtr<IDWriteTextFormat>& init_text_format,
const Microsoft::WRL::ComPtr<ID2D1Brush>& init_brush) : Control(false)
{
text_format_ = init_text_format == nullptr ? graph::CreateDefaultTextFormat() : init_text_format;
RecreateTextLayout();
brush_ = init_brush == nullptr ? CreateSolidBrush(D2D1::ColorF(D2D1::ColorF::Black)) : init_brush;
caret_brush_ = CreateSolidBrush(D2D1::ColorF(D2D1::ColorF::Black));
caret_action_ = CreateActionPtr([this]
{
is_caret_show_ = !is_caret_show_;
Repaint();
});
//selection_brush_ = CreateSolidBrush(D2D1::ColorF(D2D1::ColorF::LightSkyBlue));
}
TextBox::~TextBox() = default;
void TextBox::SetText(const String& text)
{
if (text_ != text)
{
const auto old_text = text_;
text_ = text;
OnTextChangedCore(old_text, text);
}
}
void TextBox::SetBrush(const Microsoft::WRL::ComPtr<ID2D1Brush>& brush)
{
brush_ = brush;
Repaint();
}
void TextBox::SetTextFormat(const Microsoft::WRL::ComPtr<IDWriteTextFormat>& text_format)
{
text_format_ = text_format;
RecreateTextLayout();
Repaint();
}
void TextBox::OnSizeChangedCore(events::SizeChangedEventArgs& args)
{
Control::OnSizeChangedCore(args);
text_layout_->SetMaxWidth(args.GetNewSize().width);
text_layout_->SetMaxHeight(args.GetNewSize().height);
Repaint();
}
void TextBox::OnDraw(ID2D1DeviceContext* device_context)
{
Control::OnDraw(device_context);
if (text_layout_ != nullptr)
{
device_context->DrawTextLayout(D2D1::Point2F(), text_layout_.Get(), brush_.Get());
if (is_caret_show_)
{
const auto caret_half_width = Application::GetInstance()->GetCaretInfo().half_caret_width;
FLOAT x, y;
DWRITE_HIT_TEST_METRICS metrics{};
ThrowIfFailed(text_layout_->HitTestTextPosition(position_, FALSE, &x, &y, &metrics));
device_context->FillRectangle(D2D1::RectF(metrics.left - caret_half_width, metrics.top, metrics.left + caret_half_width, metrics.top + metrics.height), caret_brush_.Get());
}
}
}
namespace
{
std::optional<unsigned> TextLayoutHitTest(IDWriteTextLayout* text_layout, const Point& point, bool test_inside = true)
{
BOOL is_trailing, is_inside;
DWRITE_HIT_TEST_METRICS metrics{};
text_layout->HitTestPoint(point.x, point.y, &is_trailing, &is_inside, &metrics);
if (!test_inside || is_inside)
return is_trailing == 0 ? metrics.textPosition : metrics.textPosition + 1;
else
return std::nullopt;
}
}
void TextBox::OnMouseDownCore(events::MouseButtonEventArgs& args)
{
Control::OnMouseDownCore(args);
if (args.GetMouseButton() == MouseButton::Left)
{
position_ = TextLayoutHitTest(text_layout_.Get(), args.GetPoint(this), false).value();
Repaint();
}
}
void TextBox::OnGetFocusCore(events::FocusChangeEventArgs& args)
{
Control::OnGetFocusCore(args);
assert(caret_timer_ == nullptr);
is_caret_show_ = true;
caret_timer_ = SetInterval(Application::GetInstance()->GetCaretInfo().caret_blink_duration, caret_action_);
}
void TextBox::OnLoseFocusCore(events::FocusChangeEventArgs& args)
{
Control::OnLoseFocusCore(args);
assert(caret_timer_ != nullptr);
caret_timer_->Cancel();
is_caret_show_ = false;
}
void TextBox::OnCharCore(events::CharEventArgs& args)
{
Control::OnCharCore(args);
if (args.GetChar() == L'\b')
{
auto text = GetText();
if (!text.empty() && position_ > 0)
{
const auto position = --position_;
text.erase(position);
SetText(text);
}
return;
}
if (std::iswprint(args.GetChar()))
{
const auto position = position_++;
auto text = GetText();
text.insert(text.cbegin() + position, { args.GetChar() });
SetText(text);
}
}
Size TextBox::OnMeasure(const Size& available_size)
{
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 LayoutSideParams& 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 LayoutSideParams& 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 TextBox::OnTextChangedCore(const String& old_text, const String& new_text)
{
RecreateTextLayout();
Repaint();
}
void TextBox::RecreateTextLayout()
{
assert(text_format_ != nullptr);
const auto dwrite_factory = 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_
));
}
}
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