Develop toggle button.

1 files changed, 123 insertions, 0 deletions

diff --git a/CruUI/ui/controls/toggle_button.cpp b/CruUI/ui/controls/toggle_button.cpp
new file mode 100644
index 00000000..ea2329ea
--- /dev/null
+++ b/CruUI/ui/controls/toggle_button.cpp
@@ -0,0 +1,123 @@
+#include "toggle_button.h"
+
+#include "graph/graph.h"
+
+namespace cru::ui::controls
+{
+    using graph::CreateSolidBrush;
+
+    // ui length parameters of toggle button.
+    constexpr float half_height = 15;
+    constexpr float half_width = half_height * 2;
+    constexpr float stroke_width = 3;
+    constexpr float inner_circle_radius = half_height - stroke_width;
+    constexpr float inner_circle_x = half_width - half_height;
+
+    ToggleButton::ToggleButton()
+    {
+        graph::GraphManager::GetInstance()->GetD2D1Factory()->CreateRoundedRectangleGeometry(D2D1::RoundedRect(D2D1::RectF(-half_width, -half_height, half_width, half_height), half_height, half_height), &frame_path_);
+
+        on_brush_ = CreateSolidBrush(D2D1::ColorF(D2D1::ColorF::LightBlue));
+        off_brush_ = CreateSolidBrush(D2D1::ColorF(D2D1::ColorF::LightGray));
+    }
+
+    inline D2D1_POINT_2F ConvertPoint(const Point& point)
+    {
+        return D2D1::Point2F(point.x, point.y);
+    }
+
+    bool ToggleButton::IsPointInside(const Point& point)
+    {
+        const auto size = GetSize();
+        const auto transform = D2D1::Matrix3x2F::Translation(size.width / 2, size.height / 2);
+        BOOL contains;
+        frame_path_->FillContainsPoint(ConvertPoint(point), transform, &contains);
+        if (!contains)
+            frame_path_->StrokeContainsPoint(ConvertPoint(point), stroke_width, nullptr, transform, &contains);
+        return contains != 0;
+    }
+
+    void ToggleButton::SetState(const bool state)
+    {
+        if (state != state_)
+        {
+            state_ = state;
+            OnToggleInternal(state);
+            Repaint();
+        }
+    }
+
+    void ToggleButton::Toggle()
+    {
+        SetState(!GetState());
+    }
+
+    void ToggleButton::OnToggle(events::ToggleEventArgs& args)
+    {
+
+    }
+
+    void ToggleButton::OnDraw(ID2D1DeviceContext* device_context)
+    {
+        const auto size = GetSize();
+        graph::WithTransform(device_context, D2D1::Matrix3x2F::Translation(size.width / 2, size.height / 2), [this](ID2D1DeviceContext* device_context)
+        {
+            if (state_)
+            {
+                device_context->DrawGeometry(frame_path_.Get(), on_brush_.Get(), stroke_width);
+                device_context->FillEllipse(D2D1::Ellipse(D2D1::Point2F(inner_circle_x, 0), inner_circle_radius, inner_circle_radius), on_brush_.Get());
+            }
+            else
+            {
+                device_context->DrawGeometry(frame_path_.Get(), off_brush_.Get(), stroke_width);
+                device_context->FillEllipse(D2D1::Ellipse(D2D1::Point2F(-inner_circle_x, 0), inner_circle_radius, inner_circle_radius), off_brush_.Get());
+            }
+        });
+    }
+
+    void ToggleButton::OnMouseClickCore(events::MouseButtonEventArgs& args)
+    {
+        Control::OnMouseClickCore(args);
+        Toggle();
+    }
+
+    Size ToggleButton::OnMeasure(const Size& available_size)
+    {
+        const auto layout_params = GetLayoutParams();
+
+        auto&& get_measure_length = [](const MeasureLength& layout_length, const float available_length, const float fix_length) -> float
+        {
+            switch (layout_length.mode)
+            {
+            case MeasureMode::Exactly:
+            {
+                return std::max(std::min(layout_length.length, available_length), fix_length);
+            }
+            case MeasureMode::Stretch:
+            {
+                return std::max(available_length, fix_length);
+            }
+            case MeasureMode::Content:
+            {
+                return fix_length;
+            }
+            default:
+                UnreachableCode();
+            }
+        };
+
+        const Size result_size(
+            get_measure_length(layout_params->width, available_size.width, half_width * 2 + stroke_width),
+            get_measure_length(layout_params->height, available_size.height, half_height * 2 + stroke_width)
+        );
+
+        return result_size;
+    }
+
+    void ToggleButton::OnToggleInternal(bool new_state)
+    {
+        events::ToggleEventArgs args(this, this, new_state);
+        OnToggle(args);
+        toggle_event.Raise(args);
+    }
+}