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#include "text_box.hpp"
#include <cwctype>
#include <cassert>
#include "graph/graph.hpp"
#include "exception.hpp"
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) : TextControl(init_text_format, init_brush)
{
SetSelectable(true);
caret_brush_ = CreateSolidBrush(D2D1::ColorF(D2D1::ColorF::Black));
SetBordered(true);
}
TextBox::~TextBox() = default;
StringView TextBox::GetControlType() const
{
return control_type;
}
void TextBox::OnDrawContent(ID2D1DeviceContext* device_context)
{
TextControl::OnDrawContent(device_context);
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(caret_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());
}
}
void TextBox::OnGetFocusCore(events::FocusChangeEventArgs& args)
{
TextControl::OnGetFocusCore(args);
assert(!caret_timer_.has_value());
is_caret_show_ = true;
caret_timer_ = SetInterval(Application::GetInstance()->GetCaretInfo().caret_blink_duration, [this]
{
is_caret_show_ = !is_caret_show_;
Repaint();
});
}
void TextBox::OnLoseFocusCore(events::FocusChangeEventArgs& args)
{
Control::OnLoseFocusCore(args);
assert(caret_timer_.has_value());
caret_timer_->Cancel();
caret_timer_ = std::nullopt;
is_caret_show_ = false;
}
void TextBox::OnKeyDownCore(events::KeyEventArgs& args)
{
Control::OnKeyDownCore(args);
if (args.GetVirtualCode() == VK_LEFT && caret_position_ > 0)
{
if (IsKeyDown(VK_SHIFT))
{
if (GetCaretSelectionSide())
ShiftLeftSelectionRange(-1);
else
ShiftRightSelectionRange(-1);
}
else
{
const auto selection = GetSelectedRange();
if (selection.has_value())
{
ClearSelection();
caret_position_ = selection.value().position;
}
else
caret_position_--;
}
Repaint();
}
if (args.GetVirtualCode() == VK_RIGHT && caret_position_ < GetText().size())
{
if (IsKeyDown(VK_SHIFT))
{
if (GetCaretSelectionSide())
ShiftLeftSelectionRange(1);
else
ShiftRightSelectionRange(1);
}
else
{
const auto selection = GetSelectedRange();
if (selection.has_value())
{
ClearSelection();
caret_position_ = selection.value().position + selection.value().count;
}
else
caret_position_++;
}
}
}
void TextBox::OnCharCore(events::CharEventArgs& args)
{
Control::OnCharCore(args);
if (args.GetChar() == L'\b')
{
if (GetSelectedRange().has_value())
{
const auto selection_range = GetSelectedRange().value();
auto text = GetText();
text.erase(text.cbegin() + selection_range.position, text.cbegin() + selection_range.position + selection_range.count);
SetText(text);
caret_position_ = selection_range.position;
ClearSelection();
}
else
{
if (caret_position_ > 0)
{
auto text = GetText();
if (!text.empty())
{
const auto position = --caret_position_;
text.erase(text.cbegin() + position);
SetText(text);
}
}
}
return;
}
if (std::iswprint(args.GetChar()))
{
if (GetSelectedRange().has_value())
{
const auto selection_range = GetSelectedRange().value();
auto text = GetText();
text.erase(selection_range.position, selection_range.count);
text.insert(text.cbegin() + selection_range.position, args.GetChar());
SetText(text);
caret_position_ = selection_range.position + 1;
ClearSelection();
}
else
{
ClearSelection();
const auto position = caret_position_++;
auto text = GetText();
text.insert(text.cbegin() + position, { args.GetChar() });
SetText(text);
}
}
}
void TextBox::RequestChangeCaretPosition(const unsigned position)
{
caret_position_ = position;
Repaint();
}
bool TextBox::GetCaretSelectionSide() const
{
const auto selection = TextRange::ToTwoSides(GetSelectedRange(), caret_position_);
if (selection.first == caret_position_)
return true;
if (selection.second == caret_position_)
return false;
assert(false);
return true;
}
void TextBox::ShiftLeftSelectionRange(const int count)
{
const auto selection_range_side = TextRange::ToTwoSides(GetSelectedRange(), caret_position_);
int new_left = selection_range_side.first + count;
new_left = new_left < 0 ? 0 : new_left; // at least 0
caret_position_ = new_left;
SetSelectedRange(TextRange::FromTwoSides(static_cast<unsigned>(new_left), selection_range_side.second));
}
void TextBox::ShiftRightSelectionRange(const int count)
{
const auto selection_range_side = TextRange::ToTwoSides(GetSelectedRange(), caret_position_);
int new_right = selection_range_side.second + count;
new_right = new_right < 0 ? 0 : new_right; // at least 0
caret_position_ = new_right;
SetSelectedRange(TextRange::FromTwoSides(selection_range_side.first, static_cast<unsigned>(new_right)));
}
}
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