Brilliant! Thanks for the help :)
On Sat, Feb 16, 2013 at 4:41 PM, Arvind R <arvin...@gmail.com> wrote:
> On Sat, Feb 16, 2013 at 8:42 PM, Justin Rosander
> <justinrosan...@gmail.com> wrote:
> > Thanks for the replies. Taking Arvind's suggestion on a structure, I put
> > the following together, but I'm getting an error:
> > slidermult.c: In function ‘_changed_cb’:
> > slidermult.c:38: error: request for member ‘ch’ in something not a
> > structure or union
> >
> > I've googled and googled, but can't really seem to be getting anywhere
> > closer to understanding what I'm doing wrong, here.
> >
> > code follows:
> > #include <Elementary.h>
> > #include <alsa/asoundlib.h>
> >
> > #define CHN 12 //define # of channels
> >
> > static snd_seq_t *seq_handle;
> > static int out_port;
> >
> > typedef struct{
> > int ch;
> > int mid_ch; //sticking with midi channel 1 for now
> > int mid_CC; //I'm wanting CC# to be assigned per widget
> > Evas_Object *sl; //Not sure if declaring this in the structure works,
> > but we'll give it a shot. The point here is to have the object
> associated
> > with bank[x].{ch,mid_ch,mid_CC}, and so on.
> > }mixer;
> >
> > void midi_open(void)
> > {
> > snd_seq_open(&seq_handle, "default", SND_SEQ_OPEN_OUTPUT, 0);
> >
> > snd_seq_set_client_name(seq_handle, "midcontroller");
> > out_port = snd_seq_create_simple_port(seq_handle, "out",
> > SND_SEQ_PORT_CAP_READ|SND_SEQ_PORT_CAP_SUBS_READ,
> > SND_SEQ_PORT_TYPE_APPLICATION);
> > }
> >
> > static void
> > on_done(void *data, Evas_Object *obj, void *event_info)
> > {
> > // quit the mainloop (elm_run function will return)
> > elm_exit();
> > }
> >
> > static void
> > _changed_cb(void *data, Evas_Object *obj, void *event_info)
> > {
> mixer *mix = data;
>
> > double val = elm_slider_value_get(obj);
> > printf("Changed to %1.0f\n", val);
> > printf("slider is %d", data.ch);
> printf("slider is %d\n", mix->ch);
>
> > snd_seq_event_t ev;
> > snd_seq_ev_clear(&ev);
> > snd_seq_ev_set_source(&ev, out_port);
> > snd_seq_ev_set_subs(&ev);
> >
> > snd_seq_ev_set_controller(&ev, 0, 0, (int)val);
> > snd_seq_ev_set_direct(&ev);
> > snd_seq_event_output_direct(seq_handle, &ev);
> > snd_seq_drain_output(seq_handle);
> > }
> >
> >
> > EAPI_MAIN int
> > elm_main(int argc, char **argv)
> > {
> >
> > midi_open();
> >
> > Evas_Object *win, *box;
> > int x;
> >
> > mixer *ptr; //pointer to structure
> > mixer bank[CHN]; //declare array of structures
> > ptr = bank; //pointer to first struct
> > ptr->mid_ch; //sticking with midi channel 1 for now
> >
> > win = elm_win_util_standard_add("slider", "Slider");
> > evas_object_smart_callback_add(win, "delete,request", on_done, NULL);
> >
> >
> > box = elm_box_add(win);
> > elm_box_horizontal_set(box, EINA_TRUE);
> > elm_win_resize_object_add(win, box);
> > evas_object_show(box);
> >
> > //set up an array of sliders
> > for(x = 0; x < CHN; x++) {
> > //set ch and CC
> > ptr->ch = x;
> > ptr->mid_CC = x;
> > //add slider
> > ptr->sl = elm_slider_add(win);
> >
> > elm_slider_horizontal_set(ptr->sl, EINA_FALSE);
> > //pack at the end of the box
> > elm_box_pack_end(box, ptr->sl);
> > evas_object_show(ptr->sl);
> > //callback to function returning value
> > evas_object_smart_callback_add(ptr->sl, "changed", _changed_cb, ptr);
> > ptr++;
> > }
> > evas_object_show(win);
> >
> > elm_run();
> > elm_shutdown();
> > return 0;
> >
> > }
> > ELM_MAIN()
> >
> >
> > On Fri, Feb 15, 2013 at 7:24 AM, Arvind R <arvin...@gmail.com> wrote:
> >
> >> On Thu, Feb 14, 2013 at 6:44 PM, Justin Rosander
> >> <justinrosan...@gmail.com> wrote:
> >> > Thanks for the reply, Arvind. Okay, so I have that working, and I
> >> > understand by passing the addresses of the array to my callback, I am
> >> > interacting with specific sliders. If the type is void, then how
> would I
> >> > specify that the values of a specific slider is supposed to be related
> >> to a
> >> > specific integer? In dealing with the callback, my understanding is
> I am
> >> > passing on the address of the array, but I cannot increment the array
> >> > directly in the callback like in a for loop:
> >> >
> >> > static void
> >> > _changed_cb(void *data, Evas_Object *obj, void *event_info)
> >> > {
> >> Generally, data is your private struct. initialised with references to
> >> all your operational data. obj would be the source of the event. You
> >> should be able to do anything you want here.
> >> > double val = elm_slider_value_get(obj);
> >> > printf("Changed to %1.0f\n", val);
> >> > printf("slider is %d", *(int*)data); //test what is passed to
> *data
> >> > snd_seq_event_t ev;
> >> > snd_seq_ev_clear(&ev);
> >> > snd_seq_ev_set_source(&ev, out_port);
> >> > snd_seq_ev_set_subs(&ev);
> >> >
> >> > snd_seq_ev_set_controller(&ev, 0, 0, (int)val); //second and
> third
> >> > args need to relate to the specific widget that is being interacted
> with,
> >> > i.e. "1" for "slider 1"
> >> >
> >> > snd_seq_ev_set_direct(&ev);
> >> > snd_seq_event_output_direct(seq_handle, &ev);
> >> > snd_seq_drain_output(seq_handle);
> >> > }
> >> >
> >> > My goal here is to have the specific slider relate to specific
> integers
> >> > such as in the second and third arguments of
> >> > snd_seq_ev_set_controller(&ev, 0, 0, (int)val);
> >> > so that when the specific slider is interacted with, I can pass to
> >> another
> >> > function that I am dealing with a specific channel number or
> controller
> >> > number.
> >> >
> >> >
> >> > On Wed, Feb 13, 2013 at 8:51 PM, Arvind R <arvin...@gmail.com> wrote:
> >> >
> >> >> On Thu, Feb 14, 2013 at 6:51 AM, Justin Rosander
> >> >> <justinrosan...@gmail.com> wrote:
> >> >> > Hi there,
> >> >> >
> >> >> > I'm trying to put together a midi controller featuring faders that
> >> would
> >> >> be
> >> >> > assigned to different channels. In exploring the use of an array
> to
> >> >> make a
> >> >> > window full of sliders, I put the following together:
> >> >> >
> >> >> > for(x = 0; x < 12; x++) {
> >> >> >
> >> >> > //add slider
> >> >> > sl[x] = elm_slider_add(win);
> >> >> >
> >> >> > elm_slider_horizontal_set(sl[x], EINA_FALSE);
> >> >> > //pack at the end of the box
> >> >> > elm_box_pack_end(box, sl[x]);
> >> >> > evas_object_show(sl[x]);
> >> >> > //callback to function returning value
> >> >> > evas_object_smart_callback_add(sl[x], "changed", _changed_cb,
> >> NULL);
> >> >> > }
> >> >> Replace the NULL in the callback_add with a pointer to data. It will
> >> >> be available as the first argument in the callback funcion as a void
> *
> >> >> . If you don't need to reference any other data in the cb, you can
> >> >> pass &sl[x]. Also, the second arg. in the cb is the first arg. in the
> >> >> callback_add().
> >> >> >
> >> >> > What I'm trying to figure out is how I would differentiate one
> slider
> >> >> from
> >> >> > another in a callback function? For instance, when I move, say,
> >> "slider
> >> >> 1"
> >> >> > as opposed to "slider 2".
> >> >> >
> >> >> > Any input is appreciated.
> >> >> >
> >> >> > Justin
> >> >> >
> >> >>
> >>
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