Carla/source/native-plugins/zynaddsubfx/UI/Fl_Osc_Slider.cpp

#include <FL/Fl.H>
#include "Fl_Osc_Slider.H"
#include "Fl_Osc_Interface.h"
#include "Fl_Osc_Pane.H"
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <cassert>
#include <sstream>
#include "../Misc/Util.h"

static double min__(double a, double b)
{
    return a<b?a:b;
}

Fl_Osc_Slider::Fl_Osc_Slider(int X, int Y, int W, int H, const char *label)
    :Fl_Slider(X,Y,W,H,label), Fl_Osc_Widget(this), reset_value(0),
     cb_data(NULL, NULL)
{
    //bounds(0.0f,1.0f);
    Fl_Slider::callback(Fl_Osc_Slider::_cb);
}

void Fl_Osc_Slider::init(std::string path_, char type_)
{
    osc_type = type_;
    ext = path_;
    oscRegister(ext.c_str());
}

Fl_Osc_Slider::~Fl_Osc_Slider(void)
{}

void Fl_Osc_Slider::OSC_value(int v)
{
    const float min_ = min__(minimum(), maximum());//flipped sliders
    Fl_Slider::value(v+min_+value()-floorf(value()));
}

void Fl_Osc_Slider::OSC_value(float v)
{
    const float min_ = min__(minimum(), maximum());//flipped sliders
    Fl_Slider::value(v+min_);
}

void Fl_Osc_Slider::OSC_value(char v)
{
    const float min_ = min__(minimum(), maximum());//flipped sliders
    Fl_Slider::value(v+min_+value()-floorf(value()));
}

void Fl_Osc_Slider::cb(void)
{
    const float min_ = min__(minimum(), maximum());//flipped sliders
    const float val = Fl_Slider::value();
    if(osc_type == 'f')
        oscWrite(ext, "f", val-min_);
    else if(osc_type == 'i')
        oscWrite(ext, "i", (int)(val-min_));
    else {
	fprintf(stderr, "invalid `c' from slider %s%s, using `i'\n", loc.c_str(), ext.c_str());
	oscWrite(ext, "i", (int)(val-min_));
    }
    //OSC_value(val);

    if(cb_data.first)
        cb_data.first(this, cb_data.second);
}

void Fl_Osc_Slider::callback(Fl_Callback *cb, void *p)
{
    cb_data.first = cb;
    cb_data.second = p;
}

int Fl_Osc_Slider::handle(int ev, int X, int Y, int W, int H)
{
    bool middle_mouse = (ev == FL_PUSH && Fl::event_state(FL_BUTTON2) && !Fl::event_shift());
    bool ctl_click    = (ev == FL_PUSH && Fl::event_state(FL_BUTTON1) && Fl::event_ctrl());
    bool shift_middle = (ev == FL_PUSH && Fl::event_state(FL_BUTTON2) && Fl::event_shift());
    if(middle_mouse || ctl_click) {
        printf("Trying to learn...\n");
        osc->write("/learn", "s", (loc+ext).c_str());
        return 1;
    } else if(shift_middle) {
        osc->write("/unlearn", "s", (loc+ext).c_str());
        return 1;
    }

    int handled;
    float rounded;

    if (ev != FL_MOUSEWHEEL)
        handled = Fl_Slider::handle(ev, X, Y, W, H);

    switch (ev) {
        case FL_PUSH:
            denominator = 2.0;
            old_value = value();
            start_pos = horizontal() ? Fl::event_x() : Fl::event_y();
            {
                float range = maximum() - minimum();
                float absrng = range > 0 ? range : -range;

                if (absrng / W / step() > 32 && Fl::event_button1())
                    denominator = 0.25;
                if (range < 0)
                    denominator *= -1;
            }
            break;
        case FL_MOUSEWHEEL:
            if (this == Fl::belowmouse() && Fl::e_dy != 0) {
                int step = 1, divisor = 16;
                switch (Fl::event_state() & ( FL_CTRL | FL_SHIFT)) {
                    case FL_SHIFT:
                        step = 8;
                    case FL_SHIFT | FL_CTRL:
                        break;
                    case FL_CTRL:
                        divisor = 128;
                    default:
                        step = (fabs(maximum() - minimum()) + 1) / divisor;
                        if (step < 1)
                            step = 1;
                }
                int dy = minimum() <=  maximum() ? -Fl::e_dy : Fl::e_dy;
                // Flip sense for vertical sliders.
                dy = this->horizontal() ? dy : -dy;
                handle_drag(clamp(value() + step * dy));
            }
            return 1;
        case FL_RELEASE:
            if (Fl::event_clicks() == 1) {
                Fl::event_clicks(0);
                value(reset_value);
            } else {
                rounded = floorf(value() + 0.5);
                value(clamp(rounded));
            }
            value_damage();
            do_callback();
            break;
        case FL_DRAG:
            if (Fl::event_shift()) {
                int delta = (horizontal() ? Fl::event_x() : Fl::event_y()) -
                    start_pos;
                rounded = floor(clamp(old_value + delta/denominator) + 0.5);
                value(rounded);
                value_damage();
                do_callback();
            }
    }
    
    return handled;
}

int Fl_Osc_Slider::handle(int ev) {
    return handle(ev,
                  x()+Fl::box_dx(box()),
                  y()+Fl::box_dy(box()),
                  w()-Fl::box_dw(box()),
                  h()-Fl::box_dh(box()));
}

void Fl_Osc_Slider::update(void)
{
    oscWrite(ext, "");
}

void Fl_Osc_Slider::_cb(Fl_Widget *w, void *)
{
    static_cast<Fl_Osc_Slider*>(w)->cb();
}