ewmh_wm_state.c

// Copyright 2020, Alisa Bedard
#include "ewmh_wm_state.h"
#include "atom.h"
#include "JBWMClient.h"
#include "client.h"
#include "ewmh.h"
#include "ewmh_state.h"
#include "log.h"
#include "max.h"
#include "util.h"
/*      Reference, per wm-spec:
        window  = the respective client window
        message_type = _NET_WM_STATE
        format = 32
        data.l[0] = the action, as listed below
        _NET_WM_STATE_REMOVE        0    remove/unset property
        _NET_WM_STATE_ADD           1    add/set property
        _NET_WM_STATE_TOGGLE        2    toggle property
        data.l[1] = first property to alter
        data.l[2] = second property to alter
        data.l[3] = source indication
        other data.l[] elements = 0 */
static void set_state(struct JBWMClient * c,
  bool add, Atom const atom){
  if (c){
    if(atom==jbwm_atoms[JBWM_NET_WM_STATE_FULLSCREEN])
      (add?jbwm_set_fullscreen:jbwm_set_not_fullscreen)(c);
    else if(atom==jbwm_atoms[JBWM_NET_WM_STATE_STICKY])
      c->opt.sticky=add;
    else if(atom==jbwm_atoms[JBWM_NET_WM_STATE_ABOVE])
      add = !add; // fall through
    else if(atom==jbwm_atoms[JBWM_NET_WM_STATE_BELOW])
      (add ? XRaiseWindow : XLowerWindow)(c->screen->xlib->display, c->parent);
    else if(atom==jbwm_atoms[JBWM_NET_WM_STATE_HIDDEN])
      (add ? jbwm_hide_client : jbwm_restore_client)(c);
    else if(atom==jbwm_atoms[JBWM_NET_WM_STATE_MAXIMIZED_VERT])
      (add ? jbwm_set_vert : jbwm_set_not_vert)(c);
    else if(atom==jbwm_atoms[JBWM_NET_WM_STATE_MAXIMIZED_HORZ])
      (add ? jbwm_set_horz : jbwm_set_not_horz)(c);
    else{
      JBWM_LOG("\tWARNING:  Unhandled state");
    }
  }
}
__attribute__((nonnull))
static void check_state(XClientMessageEvent * e,	// event data
  Atom const atom, // state to test
  struct JBWMClient * c){
  // 2 atoms can be set at once
  long * l = &e->data.l[0];
  const bool set = l[1] == (long)atom || l[2] == (long)atom;
  if(!set)
    return;
  Display * d = e->display;
  switch (e->data.l[0]) {
  default:
  case 0:	// remove
    set_state(c, false, atom);
    jbwm_ewmh_remove_state(d, e->window, atom);
    break;
  case 1:	// add
    set_state(c,true,atom);
    jbwm_ewmh_add_state(d, e->window, atom);
    break;
  case 2: { // toggle
    const bool add = !jbwm_ewmh_get_state(e->display,
      e->window, atom);
    set_state(c,add,atom);
    (add ? jbwm_ewmh_add_state : jbwm_ewmh_remove_state)
    (d, e->window, atom);
  }
  }
}
void jbwm_ewmh_handle_wm_state_changes(XClientMessageEvent * e,
  struct JBWMClient * c){
  check_state(e, jbwm_atoms[JBWM_NET_WM_STATE_ABOVE], c);
  check_state(e, jbwm_atoms[JBWM_NET_WM_STATE_BELOW], c);
  check_state(e, jbwm_atoms[JBWM_NET_WM_STATE_FULLSCREEN], c);
  check_state(e, jbwm_atoms[JBWM_NET_WM_STATE_MAXIMIZED_HORZ], c);
  check_state(e, jbwm_atoms[JBWM_NET_WM_STATE_MAXIMIZED_VERT], c);
  check_state(e, jbwm_atoms[JBWM_NET_WM_STATE_STICKY], c);
}