select.c

// jbwm - Minimalist Window Manager for X
// Copyright 2008-2020, Alisa Bedard <alisabedard@gmail.com>
// Copyright 1999-2015, Ciaran Anscomb <evilwm@6809.org.uk>
// See README for license and other details.
#include "select.h"
#include <X11/Xatom.h>
#include <X11/Xlib.h>
#include "client.h"
#include "ewmh.h"
#include "ewmh_state.h"
#include "atom.h"
#include "JBWMClient.h"
#include "util.h"
#define WM_STATE(a) EWMH_ATOM(WM_STATE_##a)
static inline jbwm_pixel_t get_bg(struct JBWMClient * c)
{
  return c->screen->pixels.bg;
}
static void set_state_not_focused(struct JBWMClient * c)
{
  Display *d=c->screen->xlib->display;
  XSetWindowBorder(d, c->parent, get_bg(c));
  jbwm_ewmh_remove_state(d, c->window, XInternAtom(d,
      "_NET_WM_STATE_FOCUSED",false));
}
static void set_border(struct JBWMClient * c)
{
  struct JBWMPixels * p = &c->screen->pixels;
  XSetWindowBorder(c->screen->xlib->display, c->parent,
    c->opt.sticky ? p->fc : p->fg);
}
static void set_focused(struct JBWMClient * c)
{
  Display * d = c->screen->xlib->display;
  XInstallColormap(d, c->cmap);
  const Window w = c->window;
  XSetInputFocus(d, w, RevertToPointerRoot, CurrentTime);
  jbwm_ewmh_add_state(d, w, jbwm_atoms[JBWM_NET_WM_STATE_FOCUSED]);
}
static void set_active_window_property(struct JBWMClient * c)
{
  /* Store the window id as a static variable here in case
   * client c is freed before the X server handles the event.
   * If the property is read after the client is freed, it will
   * cause a segmentation fault.  */
  static Window w;
  Display *d;
  w = c->window;
  d=c->screen->xlib->display;
  XChangeProperty(d, c->screen->xlib->root,
    jbwm_atoms[JBWM_NET_ACTIVE_WINDOW], XA_WINDOW, 32,
    PropModeReplace, (unsigned char *)&w, 1);
}
void jbwm_select_client(struct JBWMClient * target,
  struct JBWMClient ** current_client)
{
  struct JBWMClient * prev;
  prev = *current_client;
  set_border(target);
  set_focused(target);
  set_active_window_property(target);
  *current_client = target;
  if (prev != target) {
    if (prev)
      set_state_not_focused(prev);
  }
}