我正在开发一个窗口管理器，主要是作为练习，我遇到了一个问题。我希望能够将单击的窗口提升到堆栈顶部。目前，我在 Button1 和 ControlMask 上使用 XGrabButton 来允许移动窗口，当我按住 Ctrl 键并单击窗口时，即可实现所需的效果。但是，如果我在带有 AnyModifier 的 Button1 上使用 XGrabButton，虽然实现了我想要的效果，但我无法再通过鼠标按钮与客户端窗口交互（突出显示文本等）。我尝试过抓取 EnterNotify 上的按钮，然后在窗口升起后立即取消抓取按钮，但这似乎没有效果，窗口管理器的行为就好像我根本没有抓取过按钮一样。
我的程序还比较小，所以代码如下：
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include "window_manager.h"
ewm_instance wm;
void
ewm_init()
{
wm._display = XOpenDisplay(NULL);
if (!wm._display) {
printf("Could not open display %s\n", XDisplayName(NULL));
}
wm._root = DefaultRootWindow(wm._display);
}
void
ewm_run()
{
XSelectInput(wm._display,
wm._root,
SubstructureRedirectMask | SubstructureNotifyMask |
KeyPressMask | KeyReleaseMask |
ButtonPressMask | ButtonReleaseMask);
XSync(wm._display, 0);
XGrabServer(wm._display);
Window returned_root, returned_parent;
Window *top_level_windows;
unsigned int num_top_level_windows;
XQueryTree(wm._display,
wm._root,
&returned_root,
&returned_parent,
&top_level_windows,
&num_top_level_windows);
XFree(top_level_windows);
XUngrabServer(wm._display);
XGrabButton(
wm._display,
Button1,
ControlMask,
wm._root,
0,
ButtonPressMask | ButtonReleaseMask | ButtonMotionMask,
GrabModeAsync,
GrabModeAsync,
None,
None);
XGrabButton(
wm._display,
Button1,
ControlMask,
wm._root,
0,
ButtonPressMask | ButtonReleaseMask | ButtonMotionMask,
GrabModeAsync,
GrabModeAsync,
None,
None);
for (;;) {
XEvent e;
XNextEvent(wm._display, &e);
switch (e.type) {
case CreateNotify:
printf("CreateNotify\n");
break;
case DestroyNotify:
printf("DestroyNotify\n");
break;
case ReparentNotify:
printf("ReparentNotify\n");
break;
case MapNotify:
printf("Mapping Window\n");
break;
case UnmapNotify:
printf("UnmapNotify\n");
break;
case ConfigureNotify:
printf("ConfigureNotify\n");
break;
case MapRequest:
printf("MapRequest\n");
ewm_on_map_request(&e.xmaprequest);
break;
case ConfigureRequest:
printf("ConfigureRequest\n");
break;
case ButtonPress:
printf("ButtonPress\n");
ewm_on_button_press(&e.xbutton);
break;
case ButtonRelease:
printf("ButtonRelease\n");
break;
case MotionNotify:
ewm_on_motion_notify(&e.xmotion);
break;
case KeyPress:
printf("KeyPress\n");
ewm_on_key_press(&e.xkey);
break;
case KeyRelease:
printf("KeyRelease\n");
break;
case EnterNotify:
ewm_on_enter_notify(&e.xcrossing);
break;
default:
printf("Something else\n");
}
}
}
void
ewm_on_map_request(const XMapRequestEvent *e)
{
XSelectInput(
wm._display,
e->window,
KeyPressMask | KeyReleaseMask |
EnterWindowMask | ButtonPressMask | ButtonReleaseMask | ButtonMotionMask);
XMapWindow(wm._display, e->window);
XSetInputFocus(wm._display, e->window, RevertToPointerRoot, CurrentTime);
}
void
ewm_on_enter_notify(const XEnterWindowEvent *e)
{
printf("Entered window: %lu\n", e->window);
XSetInputFocus(wm._display, e->window, RevertToParent, CurrentTime);
}
void
ewm_on_key_press(const XKeyEvent *e)
{
if ((e->state & ControlMask) &&
e->keycode == XKeysymToKeycode(wm._display, XK_q)) {
printf("Destroying window\n");
XDestroyWindow(wm._display, e->window);
}
if ((e->state & ControlMask) &&
e->keycode == XKeysymToKeycode(wm._display, XK_Return)) {
printf("Enter Works\n");
system("urxvt &");
}
}
void
ewm_on_button_press(const XButtonEvent *e)
{
if (e->subwindow != 0) {
// Save initial cursor position;
wm._cursor_start_position = (Vector){e->x_root, e->y_root};
// Save initial window info
Window returned_root;
int x, y;
unsigned int width, height, depth, border_width;
XGetGeometry(wm._display,
e->subwindow,
&returned_root,
&x, &y,
&width, &height,
&border_width,
&depth);
wm._window_start_position = (Vector){x, y};
wm._window_start_size = (Size){width, height};
XRaiseWindow(wm._display, e->subwindow);
XSetInputFocus(wm._display, e->subwindow, RevertToParent, CurrentTime);
printf("Raising window %lu\n", e->subwindow);
printf("root id: %lu\n", wm._root);
XUngrabButton(wm._display, Button1, AnyModifier, e->subwindow);
}
}
void
ewm_on_motion_notify(const XMotionEvent *e)
{
const Vector drag_pos = {e->x_root, e->y_root};
const Vector delta = {
(drag_pos.x - wm._cursor_start_position.x),
(drag_pos.y - wm._cursor_start_position.y)
};
if ((e->state & Button1Mask) && (e->state & ControlMask)) {
const Vector dest_window_pos = {
(wm._window_start_position.x + delta.x),
(wm._window_start_position.y + delta.y)
};
if (e->subwindow != 0) {
XMoveWindow(wm._display,
e->subwindow,
dest_window_pos.x,
dest_window_pos.y);
}
}
}
void
ewm_cleanup()
{
XCloseDisplay(wm._display);
}
我也尝试过使用 XSendEvent，但根据我从中得到的结果，我认为我不太明白它应该做什么。我对 Xlib 编程非常陌生，因此非常感谢任何帮助。
谢谢！
我也遇到了完全相同的问题。 原始问题中的评论有所帮助，但还没有完全实现，它们缺少一个重要的细节（前面的第 1 点）。 最终我在这里找到了提示，并解决了它。
GrabModeSyncpointer_modeXGrabButton(dis, FOCUS_BUTTON, AnyModifier, root, False, BUTTONMASK, GrabModeSync, GrabModeAsync, None, None);
XAllowEventsXSyncXAllowEvents(display, ReplayPointer, ev->xbutton.time);
XSync(display, 0);