获取有关 X11 中离鼠标光标最近的显示器的信息

Getting information about nearest monitor to mouse cursor in X11

本文关键字：最近 光标 显示器 信息 鼠标 X11 获取      更新时间：2023-10-16

我需要获取有关多显示器系统中离鼠标光标位置最近的显示器的大小和坐标等信息。我以前在Windows中做过，我想知道如何在Linux X11中做到这一点。

使用下面的代码，我可以测量整个屏幕尺寸的总和，但不能单独测量每个显示器。

Screen *screen = DefaultScreenOfDisplay(DisplayHandle);
int xx = screen->width / 2 - Settings::WindowWidth / 2;
int yy = screen->height / 2 - Settings::WindowHeight / 2;

我以前的代码：

POINT mouse_position;
GetCursorPos(&mouse_position);
HMONITOR hMonitor = MonitorFromPoint(mouse_position, MONITOR_DEFAULTTOPRIMARY);
MONITORINFOEX monitor_info;
memset(&monitor_info, 0, sizeof(MONITORINFOEX));
monitor_info.cbSize = sizeof(MONITORINFOEX);
GetMonitorInfo(hMonitor, &monitor_info);
// CREATE WINDOW IN CENTER OF MONITOR //
int edge = GetSystemMetrics(SM_CXEDGE);
int fixed_frame = GetSystemMetrics(SM_CXFIXEDFRAME);
int monitor_width =  monitor_info.rcMonitor.right - monitor_info.rcMonitor.left;
int monitor_height =  monitor_info.rcMonitor.bottom - monitor_info.rcMonitor.top;
int xx = monitor_width / 2 - Settings::WindowWidth / 2;
int yy = monitor_height / 2 - Settings::WindowHeight / 2;
int win_x = xx - edge + monitor_info.rcMonitor.left;
int win_y = yy - fixed_frame + monitor_info.rcMonitor.top;

谢谢

如果您有两台显示器组成一个桌面，请使用 Xinerama 扩展。下面的代码选择了可用显示器中最大的屏幕，但你会明白这个想法。

#include <X11/extensions/Xinerama.h>
// By default go fullscreen
m_winWidth = DisplayWidth (m_display, m_screenNo);
m_winHeight = DisplayHeight (m_display, m_screenNo);
// But, with Xinerama, use the largest physical screen
if (XineramaIsActive (m_display))
{
  int m = 0;
  int pixels = 0;
  XineramaScreenInfo *xs = XineramaQueryScreens (m_display, &m);
  if (0 != xs && m > 0)
  {
    for (int i = 0; i < m; i++)
    {
      //printf ("%dx%d, [%d, %d] %dn", xs[i].width, xs[i].height, xs[i].x_org, xs[i].y_org, xs[i].screen_number);
      if (xs[i].width * xs[i].height > pixels)
      {
        m_xineramaScreen = xs[i].screen_number; // pick screen
        pixels = xs[i].width * xs[i].height;
        m_winWidth = xs[i].width;
        m_winHeight = xs[i].height;
      }
    }
    XFree (xs);
  }
}
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