Change the structure of project.

1 files changed, 283 insertions, 0 deletions

diff --git a/src/ui/controls/text_block.cpp b/src/ui/controls/text_block.cpp
new file mode 100644
index 00000000..93d66ba6
--- /dev/null
+++ b/src/ui/controls/text_block.cpp
@@ -0,0 +1,283 @@
+#include "text_block.h"
+
+#include "ui/window.h"
+#include "graph/graph.h"
+#include "exception.h"
+
+namespace cru
+{
+    namespace ui
+    {
+        namespace controls
+        {
+            using graph::CreateSolidBrush;
+
+            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 == 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));
+            }
+
+            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::AddTextLayoutHandler(TextLayoutHandlerPtr handler)
+            {
+                text_layout_handlers_.push_back(std::move(handler));
+            }
+
+            void TextBlock::RemoveTextLayoutHandler(const TextLayoutHandlerPtr& handler)
+            {
+                const auto find_result = std::find(text_layout_handlers_.cbegin(), text_layout_handlers_.cend(),
+                    handler);
+                if (find_result != text_layout_handlers_.cend())
+                    text_layout_handlers_.erase(find_result);
+            }
+
+            void TextBlock::SetSelectable(const bool is_selectable)
+            {
+                if (!is_selectable)
+                {
+                    is_selecting_ = false;
+                    selected_range_ = std::nullopt;
+                    Repaint();
+                }
+                is_selectable_ = is_selectable;
+            }
+
+            void TextBlock::SetSelectedRange(std::optional<TextRange> text_range)
+            {
+                if (is_selectable_)
+                {
+                    selected_range_ = text_range;
+                    Repaint();
+                }
+            }
+
+            void TextBlock::OnSizeChangedCore(events::SizeChangedEventArgs& args)
+            {
+                Control::OnSizeChangedCore(args);
+                text_layout_->SetMaxWidth(args.GetNewSize().width);
+                text_layout_->SetMaxHeight(args.GetNewSize().height);
+                Repaint();
+            }
+
+            void TextBlock::OnDraw(ID2D1DeviceContext* device_context)
+            {
+                Control::OnDraw(device_context);
+                if (selected_range_.has_value())
+                {
+                    DWRITE_TEXT_METRICS text_metrics{};
+                    ThrowIfFailed(text_layout_->GetMetrics(&text_metrics));
+                    const auto metrics_count = text_metrics.lineCount * text_metrics.maxBidiReorderingDepth;
+
+                    Vector<DWRITE_HIT_TEST_METRICS> hit_test_metrics(metrics_count);
+                    UINT32 actual_count;
+                    text_layout_->HitTestTextRange(
+                        selected_range_.value().position, selected_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), selection_brush_.Get());
+                    }
+                }
+                device_context->DrawTextLayout(D2D1::Point2F(), text_layout_.Get(), brush_.Get());
+            }
+
+            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 TextBlock::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())
+                    {
+                        mouse_down_position_ = hit_test_result.value();
+                        is_selecting_ = true;
+                        GetWindow()->CaptureMouseFor(this);
+                    }
+                    Repaint();
+                }
+            }
+
+            void TextBlock::OnMouseMoveCore(events::MouseEventArgs& args)
+            {
+                Control::OnMouseMoveCore(args);
+                if (is_selecting_)
+                {
+                    const auto hit_test_result = TextLayoutHitTest(text_layout_.Get(), args.GetPoint(this), false).value();
+                    if (hit_test_result > mouse_down_position_)
+                        selected_range_ = TextRange(mouse_down_position_, hit_test_result - mouse_down_position_);
+                    else if (hit_test_result < mouse_down_position_)
+                        selected_range_ = TextRange(hit_test_result, mouse_down_position_ - hit_test_result);
+                    else
+                        selected_range_ = std::nullopt;
+                    Repaint();
+                }
+            }
+
+            void TextBlock::OnMouseUpCore(events::MouseButtonEventArgs& args)
+            {
+                Control::OnMouseUpCore(args);
+                if (args.GetMouseButton() == MouseButton::Left)
+                {
+                    if (is_selecting_)
+                    {
+                        is_selecting_ = false;
+                        GetWindow()->ReleaseCurrentMouseCapture();
+                    }
+                }
+            }
+
+            void TextBlock::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 TextBlock::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 TextBlock::OnTextChangedCore(const String& old_text, const String& new_text)
+            {
+                RecreateTextLayout();
+                Repaint();
+            }
+
+            void TextBlock::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_
+                ));
+
+                std::for_each(text_layout_handlers_.cbegin(), text_layout_handlers_.cend(), [this](const TextLayoutHandlerPtr& handler)
+                {
+                    (*handler)(text_layout_);
+                });
+            }
+        }
+    }
+}