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|
//! Safe wrapper around the `x11-rs` crate. This should be as much safe as possible.
#![allow(dead_code)]
use x11::xlib;
use x11::xlib::{
Display,
Screen,
Cursor,
XDefaultRootWindow,
XQueryTree,
// Windows
Window,
// Events
XEvent,
};
use x11::xlib::XKeyEvent;
use std::ffi::CString;
use std::ffi::NulError;
use std::ptr;
use std::error;
use std::mem::uninitialized;
use std::slice;
use std::fmt;
pub mod window;
#[derive(Debug)]
pub struct XSafeError<'a> {
_description: &'a str,
}
impl<'a> XSafeError<'a> {
fn new(desc: &'static str) -> XSafeError<'a> {
XSafeError { _description: desc }
}
}
impl<'a> From<NulError> for XSafeError<'a> {
fn from(_: NulError) -> XSafeError<'a> {
XSafeError::new("Null ponter error!")
}
}
impl<'a> error::Error for XSafeError<'a> {
fn description(&self) -> &str {
self._description
}
fn cause(&self) -> Option<&error::Error> {
None
}
}
impl<'a> fmt::Display for XSafeError<'a> {
fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
write!(f, "{}", self._description)
}
}
/// Open a display. If the string passed by parameter is `""`, it will open the
/// default display.
///
/// # Failures
///
/// This function can raise a NulError when the bytes yielded contains an internal
/// 0 byte.
///
pub fn open_display(display: &str) -> Result<*mut Display, XSafeError> {
let d = if display == "" {
println!("Opening default display");
unsafe { xlib::XOpenDisplay(0x0 as *const i8) }
} else {
println!("Opening {}", display);
let cstr = try!(CString::new(display));
unsafe { xlib::XOpenDisplay(cstr.as_ptr()) }
};
if d.is_null() {
Err(XSafeError::new("Cannot open display!"))
} else {
Ok(d)
}
}
pub fn close_display(display: *mut Display) {
unsafe { xlib::XCloseDisplay(display); }
}
/// Grab pointer buttons.
///
/// # Example
///
/// ```
/// grab_button(
/// // Display
/// display,
/// // Button to press
/// xlib::Button1 as i32,
/// // Modifiers (can be an or of modifiers).
/// xlib::Mod1Mask,
/// // owner events.
/// true,
/// // Which motions we'll handle
/// ButtonPressMask | ButtonReleaseMask | PointerMotionMask,
/// // Keyboard and pointer sync moddes
/// GrabModeAsync, GrabModeAsync,
/// // Confine to and cursor. (Can be 0 :) )
/// 0, 0
/// );
/// ```
pub fn grab_button(display: *mut Display, button: u32, modifiers: u32,
owner_events: bool, event_mask: i64, pointer_mode: i32,
keyboard_mode: i32, confine_to: Window,
cursor: Cursor) {
unsafe {
let default_win = xlib::XDefaultRootWindow(display);
xlib::XGrabButton(display, button, modifiers , default_win,
owner_events as i32, event_mask as u32, pointer_mode,
keyboard_mode, confine_to, cursor);
}
}
/// Register a combination of keys that will send a `XEvent`
///
pub fn grab_key(display: *mut Display, key: u32, modifiers: u32, owner_events: bool,
pointer_mode: i32, keyboard_mode: i32) {
unsafe {
let default_win = xlib::XDefaultRootWindow(display);
let keycode: i32 = xlib::XKeysymToKeycode(display, key as u64) as i32;
xlib::XGrabKey(display, keycode, modifiers, default_win,
owner_events as i32, pointer_mode, keyboard_mode);
}
}
/// Get the next event from the xserver. This call will block until a
/// event spawns.
pub fn next_xevent(display: *mut Display) -> XEvent {
unsafe {
let mut last_event: XEvent = uninitialized();
println!("xevent: getting next event!");
xlib::XNextEvent(display, &mut last_event);
last_event
}
}
// Window code.
/// Get a list from the active windows. This doesn't generate a hierarchical
/// struture, so it may change on the future.
pub fn window_list(display: *mut Display) -> &'static [Window] {
let mut root: Window = 0;
let mut parent: Window = 0;
let mut children_count: u32 = 0;
unsafe {
let root_window = XDefaultRootWindow(display);
let mut children: *mut Window = uninitialized();
XQueryTree(display, root_window,
&mut root, &mut parent,
&mut children, &mut children_count);
slice::from_raw_parts(children as *const Window, children_count as usize)
}
}
fn screen_ratio(d: *mut Display) -> f32 {
let screen: xlib::Screen = unsafe {
let scrptr = xlib::XDefaultScreenOfDisplay(d);
ptr::read(scrptr)
};
screen.height as f32 / screen.width as f32
}
/// Get certain color from the display.
///
/// # Example.
///
/// This function can be called with a &str
///
/// ```
/// get_color(display, "red");
/// ```
fn get_color<T: Into<Vec<u8>>>(display: *mut Display, color: T) -> u64{
let screen_num = unsafe { xlib::XDefaultScreen(display) };
let colormap = unsafe { xlib::XDefaultColormap(display, screen_num) };
unsafe {
let mut xcolor: xlib::XColor = uninitialized();
let cstr = CString::new(color).unwrap();
xlib::XAllocNamedColor(display, colormap, cstr.as_ptr(),
&mut xcolor, &mut xcolor);
xcolor.pixel
}
}
/// Get the keysym for the given event.
pub fn lookup_keysym(ev: &mut XKeyEvent) -> xlib::KeySym {
unsafe { xlib::XLookupKeysym(ev, 0) }
}
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