FD2D/Button.cpp at master · floyd68/FD2D · GitHub

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#include "Button.h"

namespace FD2D
{
    Button::Button()
        : Wnd()
    {
        SetContentMargin(10.0f, 5.0f);
        SetContentAlign(AlignH::Center, AlignV::Center);
    }

    Button::Button(const std::wstring& name)
        : Wnd(name)
    {
        SetContentMargin(10.0f, 5.0f);
        SetContentAlign(AlignH::Center, AlignV::Center);
    }

    Size Button::Measure(Size available)
    {
        Size labelSize = m_label.Measure(available);
        m_desired = {
            labelSize.w + m_contentMargin.Horizontal() + 2.0f * m_margin,
            labelSize.h + m_contentMargin.Vertical() + 2.0f * m_margin
        };
        return m_desired;
    }

    void Button::SetRect(const D2D1_RECT_F& rect)
    {
        SetLayoutRect(rect);
    }

    void Button::Arrange(Rect finalRect)
    {
        Wnd::Arrange(finalRect);
        Size labelSize = m_label.Measure({ 0.0f, 0.0f });
        m_label.SetRect(ToD2D(ContentRectFor(labelSize)));
    }

    void Button::SetLabel(const std::wstring& text)
    {
        m_label.SetText(text);
        NotifyContentLayoutChanged();
    }

    void Button::SetColors(const D2D1_COLOR_F& normal, const D2D1_COLOR_F& hot, const D2D1_COLOR_F& pressed)
    {
        m_colorNormal = normal;
        m_colorHot = hot;
        m_colorPressed = pressed;
    }

    void Button::OnClick(ClickHandler handler)
    {
        m_click = std::move(handler);
    }

    bool Button::OnInputEvent(const InputEvent& event)
    {
        switch (event.type)
        {
        case InputEventType::MouseMove:
        {
            if (!event.hasPoint)
            {
                return false;
            }
            POINT pt = event.point;
            bool prevHover = m_hovered;
            m_hovered = HitTest(pt);
            if (m_hovered != prevHover)
            {
                Invalidate();
            }
            return m_hovered;
        }
        case InputEventType::MouseDown:
        {
            if (event.button != MouseButton::Left || !event.hasPoint)
            {
                break;
            }
            POINT pt = event.point;
            if (HitTest(pt))
            {
                m_pressed = true;
                Invalidate();
                return true;
            }
            break;
        }
        case InputEventType::MouseUp:
        {
            if (event.button != MouseButton::Left || !event.hasPoint)
            {
                break;
            }
            bool wasPressed = m_pressed;
            m_pressed = false;

            POINT pt = event.point;
            if (wasPressed && HitTest(pt))
            {
                if (m_click)
                {
                    m_click();
                }
                Invalidate();
                return true;
            }
            if (wasPressed)
            {
                Invalidate();
            }
            break;
        }
        default:
            break;
        }

        return Wnd::OnInputEvent(event);
    }

    void Button::OnRender(ID2D1RenderTarget* target)
    {
        if (target == nullptr)
        {
            return;
        }

        if (!m_brush)
        {
            target->CreateSolidColorBrush(D2D1::ColorF(D2D1::ColorF::White), &m_brush);
        }

        D2D1_COLOR_F fillColor = m_colorNormal;
        if (m_pressed)
        {
            fillColor = m_colorPressed;
        }
        else if (m_hovered)
        {
            fillColor = m_colorHot;
        }

        // Flat, rounded surface with a subtle hairline border that lifts to the
        // accent blue on hover (replaces the old hard white 1.5px outline).
        D2D1_ROUNDED_RECT rr = D2D1::RoundedRect(LayoutRect(), 4.0f, 4.0f);
        m_brush->SetColor(fillColor);
        target->FillRoundedRectangle(rr, m_brush.Get());

        m_brush->SetColor(m_hovered ? D2D1::ColorF(0.26f, 0.55f, 0.96f, 0.90f)
                                    : D2D1::ColorF(1.0f, 1.0f, 1.0f, 0.16f));
        target->DrawRoundedRectangle(rr, m_brush.Get(), 1.0f);

        m_label.OnRender(target);

        Wnd::OnRender(target);
    }

    bool Button::HitTest(const POINT& pt) const
    {
        const auto& rect = LayoutRect();
        return pt.x >= rect.left &&
            pt.x <= rect.right &&
            pt.y >= rect.top &&
            pt.y <= rect.bottom;
    }
}