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// https://tronche.com/gui/x/xlib/
const std = @import("std");
const xlib = @cImport({
@cInclude("X11/Xlib.h");
// This should work and pull in header with all the mappings
// making xlib.XK_Escape available but it doesn't.
@cInclude("X11/keysymdef.h");
});
// Defining key symbols by hand from keysymdef.h file.
const KeySym = enum(u32) {
ESCAPE = 0xFF1B,
LEFT = 0xff51,
UP = 0xff52,
RIGHT = 0xff53,
DOWN = 0xff54,
};
const Box = struct {
x: i32,
y: i32,
};
const StepSize = 30;
pub fn main() !void {
const display = xlib.XOpenDisplay(null);
if (display == null) {
return error.DisplayOpenFailed;
}
const root_window = xlib.XDefaultRootWindow(display);
const main_window = xlib.XCreateSimpleWindow(
display,
root_window,
0,
0,
400,
800,
0,
0,
0xFFFFFF,
);
_ = xlib.XMapWindow(display, main_window);
_ = xlib.XFlush(display);
_ = xlib.XSelectInput(display, main_window, xlib.KeyPressMask);
_ = xlib.XMapWindow(display, main_window);
_ = xlib.XStoreName(display, main_window, "Moving boxes");
var gc = xlib.XCreateGC(display, main_window, 0, null) orelse {
std.debug.print("Failed to create graphics context\n", .{});
return error.CreateGCFailed;
};
defer {
_ = xlib.XFreeGC(display, gc);
}
var box = Box{ .x = 0, .y = 0 };
var event: xlib.XEvent = undefined;
while (true) {
_ = xlib.XNextEvent(display, &event);
if (event.type == xlib.KeyPress) {
var keysym = xlib.XLookupKeysym(&event.xkey, 0);
// NOTE: There probably is a better way of matching key presses
// without casting. I tried creating enum with type
// c_ulong without luck. More described in link below.
// https://ziglang.org/documentation/0.9.1/#Primitive-Types
if (keysym == @intFromEnum(KeySym.ESCAPE)) {
std.debug.print("Exiting game\n", .{});
break;
}
if (keysym == @intFromEnum(KeySym.LEFT)) {
box.x -= StepSize;
}
if (keysym == @intFromEnum(KeySym.RIGHT)) {
box.x += StepSize;
}
if (keysym == @intFromEnum(KeySym.UP)) {
box.y -= StepSize;
}
if (keysym == @intFromEnum(KeySym.DOWN)) {
box.y += StepSize;
}
}
_ = xlib.XClearWindow(display, main_window);
_ = xlib.XDrawString(display, main_window, gc, 150, 150, "Use arrow keys.", 15);
_ = xlib.XFillRectangle(display, main_window, gc, box.x, box.y, 100, 100);
}
}
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