为什么以下X11 / Xorg代码没有在Ubuntu 18.04下隐藏鼠标光标?如果不是这样做的话,那是什么?是否缺少一些依赖项/库/.dev包?
我的直觉说这可能是Ubuntu(或Debian)X11 / Xorg软件包中的错误或类似错误。 Haxe / Kha通过这种方式隐藏鼠标,以便在各个平台之间兼容。
#include <iostream>
#include <X11/X.h>
#include <X11/Xlib.h>
#include <X11/keysym.h>
#include <X11/Xutil.h>
#include <X11/Xos.h>
#include <string>
#include <iostream>
Window window;
void show();
int main()
{
Display *display;
XEvent e;
std::string msg = "Hello, World!";
int screen;
display = XOpenDisplay(nullptr);
if (display == nullptr)
{
std::cerr << "Cannot open display\n";
throw;
}
screen = XDefaultScreen(display);
window = XCreateSimpleWindow(display, RootWindow(display, screen), 10, 10, 500, 500, 1,
BlackPixel(display, screen), WhitePixel(display, screen));
XStoreName(display, window, "Silly Window");
XSelectInput(display, window, ExposureMask | KeyPressMask );
XMapWindow(display, window);
while (true)
{
XNextEvent(display, &e);
if (e.type == Expose)
{
std::cout << "Window Exposed!\n";
XExposeEvent ev = e.xexpose;
if (ev.window != window) continue;
XFillRectangle(display, window, DefaultGC(display, screen), 50, 50, 400, 50);
XDrawString(display, window, DefaultGC(display, screen), 220, 220, msg.c_str(), msg.length());
XFillRectangle(display, window, DefaultGC(display, screen), 50, 400, 400, 50);
}
else if (e.type == KeyPress)
{
char buf[128] = {0};
KeySym keysym;
int len = XLookupString(&e.xkey, buf, sizeof buf, &keysym, NULL);
if (keysym == XK_Escape)
{
break;
}
else if (keysym == XK_space)
{
show();
XAllowEvents(display, SyncBoth, CurrentTime);
}
}
}
XDestroyWindow(display, window);
XCloseDisplay(display);
return 0;
}
bool toggle = false;
void show()
{
Display* dpy = XOpenDisplay(0);
if (toggle)
{
std::cout << "toggle On\n";
XUndefineCursor(dpy, window);
}
else
{
std::cout << "toggle Off\n";
XColor col;
char data[1] = {0X00};
Pixmap blank = XCreateBitmapFromData(dpy, window, data, 1, 1);
Cursor cursor = XCreatePixmapCursor(dpy, blank, blank, &col, &col, 0, 0);
XDefineCursor(dpy, window, cursor);
// XSetWindowAttributes wa;
// XChangeWindowAttributes(dpy, window, CWCursor, &wa);
// wa.cursor = cursor;
XFreePixmap(dpy, blank);
}
toggle = !toggle;
}
答案 0 :(得分:1)
是的,我可以确认代码确实有效
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/extensions/Xfixes.h>
#include <string>
#include <iostream>
Window window;
void show(Display *dispy);
int main()
{
Display *display;
XEvent e;
std::string msg = "Hello, World!";
int screen;
display = XOpenDisplay(nullptr);
if (display == nullptr)
{
std::cerr << "Cannot open display\n";
throw;
}
screen = XDefaultScreen(display);
window = XCreateSimpleWindow(display, RootWindow(display, screen), 10, 10, 500, 500, 1,
BlackPixel(display, screen), WhitePixel(display, screen));
XStoreName(display, window, "Silly Window");
XSelectInput(display, window, ExposureMask | KeyPressMask );
XMapWindow(display, window);
while (true)
{
XNextEvent(display, &e);
if (e.type == Expose)
{
std::cout << "Window Exposed!\n";
XExposeEvent ev = e.xexpose;
if (ev.window != window) continue;
XFillRectangle(display, window, DefaultGC(display, screen), 50, 50, 400, 50);
XDrawString(display, window, DefaultGC(display, screen), 220, 150, msg.c_str(), msg.length());
XDrawString(display, window, DefaultGC(display, screen), 220, 220, msg.c_str(), msg.length());
XDrawString(display, window, DefaultGC(display, screen), 220, 300, msg.c_str(), msg.length());
XFillRectangle(display, window, DefaultGC(display, screen), 50, 400, 400, 50);
}
else if (e.type == KeyPress)
{
char buf[128] = {0};
KeySym keysym;
XLookupString(&e.xkey, buf, sizeof buf, &keysym, NULL);
if (keysym == XK_Escape)
{
break;
}
else if (keysym == XK_space)
{
show(display);
XAllowEvents(display, SyncBoth, CurrentTime);
}
}
}
XDestroyWindow(display, window);
XCloseDisplay(display);
return 0;
}
bool toggle = true;
void show(Display *dpy)
{
if (toggle)
{
std::cout << "toggle On->Off\n";
XFixesHideCursor(dpy, window);
XFlush(dpy);
}
else
{
std::cout << "toggle Off->On\n";
XFixesShowCursor(dpy, window);
XFlush(dpy);
}
toggle = !toggle;
}