DPF/examples/CairoUI/DemoWidgetClickable.hpp

/*
 * DISTRHO Plugin Framework (DPF)
 * Copyright (C) 2012-2021 Filipe Coelho <falktx@falktx.com>
 * Copyright (C) 2019-2021 Jean Pierre Cimalando <jp-dev@inbox.ru>
 *
 * Permission to use, copy, modify, and/or distribute this software for any purpose with
 * or without fee is hereby granted, provided that the above copyright notice and this
 * permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
 * TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN
 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#pragma once

#include "Cairo.hpp"

START_NAMESPACE_DGL

// -----------------------------------------------------------------------

class DemoWidgetClickable : public CairoSubWidget
{
public:
    explicit DemoWidgetClickable(SubWidget* const parent)
        : CairoSubWidget(parent),
          colorId(0) {}

    explicit DemoWidgetClickable(TopLevelWidget* const parent)
        : CairoSubWidget(parent),
          colorId(0) {}

protected:
    void onCairoDisplay(const CairoGraphicsContext& context) override
    {
        cairo_t* const cr = context.handle;

        const Size<uint> sz = getSize();
        const int w = sz.getWidth();
        const int h = sz.getHeight();

        switch (colorId)
        {
        case 0:
            cairo_set_source_rgb(cr, 0.75, 0.0, 0.0);
            break;
        case 1:
            cairo_set_source_rgb(cr, 0.0, 0.75, 0.0);
            break;
        case 2:
            cairo_set_source_rgb(cr, 0.0, 0.0, 0.75);
            break;
        }

        cairo_rectangle(cr, 0, 0, w, h);
        cairo_fill(cr);

        cairo_set_source_rgb(cr, 0.9, 0.9, 0.9);
        cairo_new_path(cr);
        cairo_move_to(cr, 0.25 * w, 0.25 * h);
        cairo_line_to(cr, 0.75 * w, 0.75 * h);
        cairo_stroke(cr);
        cairo_new_path(cr);
        cairo_move_to(cr, 0.75 * w, 0.25 * h);
        cairo_line_to(cr, 0.25 * w, 0.75 * h);
        cairo_stroke(cr);
    }

    bool onMouse(const MouseEvent& event) override
    {
        if (event.press)
        {
            const int w = getWidth();
            const int h = getHeight();
            const int mx = event.pos.getX();
            const int my = event.pos.getY();

            // inside
            if (mx >= 0 && my >= 0 && mx < w && my < h)
            {
                colorId = (colorId + 1) % 3;
                repaint();
            }
        }

        return CairoSubWidget::onMouse(event);
    }

private:
    uint colorId;
};

// -----------------------------------------------------------------------

END_NAMESPACE_DGL

using DGL_NAMESPACE::DemoWidgetClickable;