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#include "text_control.h"
#include "ui/window.h"
#include "graph/graph.h"
#include "exception.h"
#include <cassert>
namespace cru::ui::controls
{
using graph::CreateSolidBrush;
inline Microsoft::WRL::ComPtr<IDWriteFactory> GetDWriteFactory()
{
return graph::GraphManager::GetInstance()->GetDWriteFactory();
}
TextControl::TextControl(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;
selection_brush_ = CreateSolidBrush(D2D1::ColorF(D2D1::ColorF::LightSkyBlue));
}
void TextControl::SetText(const String& text)
{
if (text_ != text)
{
const auto old_text = text_;
text_ = text;
OnTextChangedCore(old_text, text);
}
}
void TextControl::SetBrush(const Microsoft::WRL::ComPtr<ID2D1Brush>& brush)
{
brush_ = brush;
Repaint();
}
void TextControl::SetTextFormat(const Microsoft::WRL::ComPtr<IDWriteTextFormat>& text_format)
{
text_format_ = text_format;
RecreateTextLayout();
Repaint();
}
void TextControl::SetSelectable(const bool is_selectable)
{
if (is_selectable_ != is_selectable)
{
if (!is_selectable)
{
if (is_selecting_)
{
is_selecting_ = false;
GetWindow()->ReleaseCurrentMouseCapture();
}
selected_range_ = std::nullopt;
Repaint();
}
is_selectable_ = is_selectable;
if (is_selectable) //TODO!!!
SetCursor(cursors::i_beam);
else
SetCursor(cursors::arrow);
}
}
void TextControl::SetSelectedRange(std::optional<TextRange> text_range)
{
if (is_selectable_)
{
selected_range_ = text_range;
Repaint();
}
}
void TextControl::OnSizeChangedCore(events::SizeChangedEventArgs& args)
{
Control::OnSizeChangedCore(args);
const auto content = GetRect(RectRange::Content);
ThrowIfFailed(text_layout_->SetMaxWidth(content.width));
ThrowIfFailed(text_layout_->SetMaxHeight(content.height));
Repaint();
}
namespace
{
std::optional<unsigned> TextLayoutHitTest(IDWriteTextLayout* text_layout, const Point& point, const 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 DrawSelectionRect(ID2D1DeviceContext* device_context, 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)
device_context->FillRoundedRectangle(D2D1::RoundedRect(D2D1::RectF(metrics.left, metrics.top, metrics.left + metrics.width, metrics.top + metrics.height), 3, 3), brush);
}
}
}
void TextControl::OnDrawContent(ID2D1DeviceContext* device_context)
{
Control::OnDrawContent(device_context);
DrawSelectionRect(device_context, text_layout_.Get(), selection_brush_.Get(), selected_range_);
device_context->DrawTextLayout(D2D1::Point2F(), text_layout_.Get(), brush_.Get());
}
void TextControl::OnMouseDownCore(events::MouseButtonEventArgs& args)
{
Control::OnMouseDownCore(args);
if (is_selectable_ && args.GetMouseButton() == MouseButton::Left)
{
selected_range_ = std::nullopt;
const auto hit_test_result = TextLayoutHitTest(text_layout_.Get(), args.GetPoint(this), true);
if (hit_test_result.has_value())
{
RequestChangeCaretPosition(hit_test_result.value());
mouse_down_position_ = hit_test_result.value();
is_selecting_ = true;
GetWindow()->CaptureMouseFor(this);
}
Repaint();
}
}
void TextControl::OnMouseMoveCore(events::MouseEventArgs& args)
{
Control::OnMouseMoveCore(args);
if (is_selecting_)
{
const auto hit_test_result = TextLayoutHitTest(text_layout_.Get(), args.GetPoint(this), false).value();
RequestChangeCaretPosition(hit_test_result);
selected_range_ = TextRange::FromTwoSides(hit_test_result, mouse_down_position_);
Repaint();
}
}
void TextControl::OnMouseUpCore(events::MouseButtonEventArgs& args)
{
Control::OnMouseUpCore(args);
if (args.GetMouseButton() == MouseButton::Left)
{
if (is_selecting_)
{
is_selecting_ = false;
GetWindow()->ReleaseCurrentMouseCapture();
}
}
}
void TextControl::OnLoseFocusCore(events::FocusChangeEventArgs& args)
{
Control::OnLoseFocusCore(args);
if (is_selecting_)
{
is_selecting_ = false;
GetWindow()->ReleaseCurrentMouseCapture();
}
if (!args.IsWindow()) // If the focus lose is triggered window-wide, then save the selection state. Otherwise, clear selection.
{
selected_range_ = std::nullopt;
Repaint();
}
}
Size TextControl::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));
const Size measure_result(metrics.width, metrics.height);
return measure_result;
}
void TextControl::RequestChangeCaretPosition(unsigned position)
{
}
void TextControl::OnTextChangedCore(const String& old_text, const String& new_text)
{
RecreateTextLayout();
InvalidateLayout();
Repaint();
}
void TextControl::RecreateTextLayout()
{
assert(text_format_ != nullptr);
text_layout_ = 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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