src/button.cpp - master - SilovAndrey/easel_gui

src/button.cpp
85 строк3 KB
Andrey HomePC
первая рабочая версия
21 июл 2026, 11:50
21 июл 2026, 11:5038b8d4a
module;
#include <functional>
#include <memory>
#include <thorvg.h>

module Easel.GUI;

import Easel.GUI.Log;

namespace easel::gui {

WidgetPtr button(const char* text,
                 std::function<void()> onClick)
{
    struct ButtonWidget : Widget
    {
        std::string m_text;
        tvg::Shape* m_bg;
        tvg::Text*  m_label;
        std::function<void()> m_onClick;
        rect m_bounds;
        float m_radius = 0, m_padding = 0;
        bool m_hovered = false;

        ButtonWidget(const char* t, std::function<void()> cb)
            : m_text(t), m_onClick(std::move(cb)) {}

        void init(tvg::Canvas* c, Theme const& th, rect const& b) override
        {
            m_bounds = b;
            m_radius = th.radius;
            m_padding = th.padding;

            log_info("init Button %f %f %f %f", b.left, b.top, b.right, b.bottom);

            m_bg = tvg::Shape::gen();
            m_bg->fill(th.button_bg.red, th.button_bg.green, th.button_bg.blue, th.button_bg.alpha);
            if (m_radius > 0) m_bg->appendRect(b.left, b.top, b.width(), b.height(), m_radius, m_radius);
            else m_bg->appendRect(b.left, b.top, b.width(), b.height());
            c->add(m_bg);

            m_label = tvg::Text::gen();
            m_label->text(m_text.c_str());
            m_label->font(th.font.c_str());
            m_label->size(th.size_font);
            m_label->fill(th.text_color.red, th.text_color.green, th.text_color.blue);
            auto in = b.inset(m_padding);
            m_label->translate(in.left, in.top);
            c->add(m_label);
        }

        bool resize(rect const& b, Theme const&) override
        {
            if (m_bounds == b) return false; m_bounds = b;
            m_bg->reset();
            if (m_radius > 0)
                m_bg->appendRect(b.left, b.top, b.width(), b.height(), m_radius, m_radius);
            else
                m_bg->appendRect(b.left, b.top, b.width(), b.height());
            auto in = b.inset(m_padding); m_label->translate(in.left, in.top);
            return true;
        }

        bool on_event(Event const& e, Theme const& th) override
        {
            //if (!m_bounds.includes(e.pos)) return false;
            if (e.type == Event::Hover) {
                m_hovered = !m_hovered;
                auto& c = m_hovered ? th.button_hover : th.button_bg;
                m_bg->fill(c.red, c.green, c.blue, c.alpha);
                return true;
            }
            if (e.type == Event::Click && m_onClick) { m_onClick(); return false; }
            return false;
        }

        float preferred_width(Theme const& th) const override
        { return m_text.size() * th.size_font * 1.6f + m_padding * 2; }
        float preferred_height(Theme const& th) const override
        { return th.size_font * 3.0f + m_padding * 2; }
    };
    return std::make_unique<ButtonWidget>(text, std::move(onClick));
}

} // namespace easel::gui