C语言 Xlib:如何检查一个特定的窗口是否被最小化?

Question

我想判断特定窗口是否被最小化。但是坐标和非最小化是一样的。如何判断窗口是否被最小化?我发现已经标出来的问题已经解决了，但是它不工作。

Xlib:如何检查窗口是否被最小化?

Answer 1

根据你上面的评论，试试这个:

//try to get the atoms, don't create it if it does not exist
Atom wm_state = XInternAtom(dpy, "_NET_WM_STATE", True);
Atom wm_hidden = XInternAtom(dpy, "_NET_WM_STATE_HIDDEN", True);
//test if the atoms do exists
if (wm_state == None) { /*does not exist*/ }
if (wm_hidden == None) { /*does not exist*/ }

然后调用XGetWindowProperty函数:

long max_length = 1024;
Atom actual_type;
int actual_format;
unsigned long bytes_after, num_states = 0;
Atom* states = NULL;
if (XGetWindowProperty(
dpy, //your display handle
id, //your windows handle
wm_state, //the atom you received earlier
0l,  //no offset
max_length,
False, //do not delete
XA_ATOM, //requested type
&actual_type, //atom identifier that defines the actual type
&actual_format, //actual format of the property
&num_states, //actual number of items stored in the states data
&bytes_after, //number of bytes remaining on a partial read
(unsigned char**) &states //data in the specified format
) == Success) {
//iterate over the returned list of atoms
for (unsigned long i = 0; i < num_states; ++i) {
//test if the list contains the 'hidden' state
if (states[i] == wm_hidden) { /* state is set */ }
}
}

参考:

• 应用程序窗口属性- _NET_WM_STATE
• XInternAtom
• XGetWindowProperty

---

示例(基于讨论):

/* window states */
typedef enum {
WINDOW_STATE_NONE               = 0,
WINDOW_STATE_MODAL              = (1 << 0),
WINDOW_STATE_STICKY             = (1 << 1),
WINDOW_STATE_MAXIMIZED_VERT     = (1 << 2),
WINDOW_STATE_MAXIMIZED_HORZ     = (1 << 3),
WINDOW_STATE_MAXIMIZED          = (WINDOW_STATE_MAXIMIZED_VERT | WINDOW_STATE_MAXIMIZED_HORZ),
WINDOW_STATE_SHADED             = (1 << 4),
WINDOW_STATE_SKIP_TASKBAR       = (1 << 5),
WINDOW_STATE_SKIP_PAGER         = (1 << 6),
WINDOW_STATE_HIDDEN             = (1 << 7),
WINDOW_STATE_FULLSCREEN         = (1 << 8),
WINDOW_STATE_ABOVE              = (1 << 9),
WINDOW_STATE_BELOW              = (1 << 10),
WINDOW_STATE_DEMANDS_ATTENTION  = (1 << 11),
WINDOW_STATE_FOCUSED            = (1 << 12),
WINDOW_STATE_SIZE               = 13,
} window_state_t;
/* state names */
static char* WINDOW_STATE_NAMES[] = {
"_NET_WM_STATE_MODAL",
"_NET_WM_STATE_STICKY",
"_NET_WM_STATE_MAXIMIZED_VERT",
"_NET_WM_STATE_MAXIMIZED_HORZ",
"_NET_WM_STATE_SHADED",
"_NET_WM_STATE_SKIP_TASKBAR",
"_NET_WM_STATE_SKIP_PAGER",
"_NET_WM_STATE_HIDDEN",
"_NET_WM_STATE_FULLSCREEN",
"_NET_WM_STATE_ABOVE",
"_NET_WM_STATE_BELOW",
"_NET_WM_STATE_DEMANDS_ATTENTION",
"_NET_WM_STATE_FOCUSED"
};
/* some window struct */
typedef struct {
Display *dpy;
Window id;
struct {
Atom NET_WM_STATE;
Atom NET_WM_STATES[WINDOW_STATE_SIZE];
} atoms;
} window_t;
window_t win;
/* in window initialization function */
win->atoms.NET_WM_STATE = XInternAtom(win->dpy, "_NET_WM_STATE", False);
for (i=0; i < WINDOW_STATE_SIZE; ++i) {
win->atoms.NET_WM_STATES[i] = XInternAtom(win->dpy, WINDOW_STATE_NAMES[i], False);
}
/* a function to retrieve the current state of the window */
window_state_t get_window_state(window_t *win)
{
long max_length = 1024;
Atom actual_type;
int actual_format;
unsigned long bytes_after, i, num_states = 0;
Atom* states = NULL;
window_state_t state = WINDOW_STATE_NONE;
if (XGetWindowProperty(win->dpy,
win->id,
win->atoms.NET_WM_STATE,
0l,
max_length,
False,
XA_ATOM,
&actual_type,
&actual_format,
&num_states,
&bytes_after,
(unsigned char**) &states) == Success)
{
//for every state we get from the server
for (i = 0; i < num_states; ++i) {
//for every (known) state
for (int n=0; n < WINDOW_STATE_SIZE; ++n) {

//test the state at index i
if (states[i] == win->atoms.NET_WM_STATES[n]) {
state |= (1 << n);
break;
}

}
}
XFree(states);
}
return state;
}