在纯 GDK 3.10(无 GTK)项目中,如何刷新/清除/重绘 GdkWindow 的透明背景?
这test.c
会在初始化(gdk_window_show())时正确设置背景,当我对窗口进行图标化+去图标化但不是在调整大小或通过鼠标移动它时:
#include <gdk/gdk.h>
// #include <gdk/gdkx.h> // GDK X11
// #include <X11/Xlib.h> // Xlib
// #include <X11/Xutil.h>
void eventHandler(GdkEvent *evt, gpointer data) {
GdkWindow *win = (GdkWindow *)data;
switch(evt->type)
{
case GDK_CONFIGURE: {
// refresh window background here
printf("refresh background here\n");
break;
}
case GDK_DELETE: {
gdk_window_destroy(win);
_exit(0);
break;
}
default:
break;
}
}
int main(int argc, char *argv[]) {
gdk_init(NULL, NULL);
GdkDisplay *disp=gdk_display_get_default();
GdkScreen *scr = gdk_display_get_default_screen (disp);
GdkWindow *root = gdk_screen_get_root_window(scr);
GdkWindowAttr attr;
attr.width=200;
attr.height=200;
attr.x=0;
attr.y=0;
attr.window_type = GDK_WINDOW_TOPLEVEL;
attr.wclass=GDK_INPUT_OUTPUT;
GdkVisual *vis = gdk_screen_get_rgba_visual (scr);
attr.visual = vis;
GdkWindow *newWin=gdk_window_new(root,&attr, GDK_WA_X | GDK_WA_Y);
GdkRGBA color = { .red=1.0, .green=0.0, .blue=1.0, .alpha=0.0};
gdk_window_set_background_rgba(newWin, &color);
gdk_event_handler_set (eventHandler, newWin, NULL);
gdk_window_show(newWin);
GMainLoop *mainloop = g_main_new (TRUE);
g_main_loop_run (mainloop);
gdk_display_close(disp);
return 0;
}
gcc 构建命令:
gcc -o test test.c `pkg-config gdk-3.0 --libs --cflags`
结果:
注意:我的目标是 X11,所以我也可以包含 Xlib 或GDK X11 后端函数。
感谢您的任何帮助或指点。