use std::cmp;
use super::*;
// Friendly neighborhood axis-aligned rectangle
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct AaRect {
x: i64,
y: i64,
width: i64,
height: i64,
}
impl AaRect {
pub fn new((x, y): (i32, i32), (width, height): (u32, u32)) -> Self {
let (x, y) = (x as i64, y as i64);
let (width, height) = (width as i64, height as i64);
AaRect {
x,
y,
width,
height,
}
}
pub fn contains_point(&self, x: i64, y: i64) -> bool {
x >= self.x && x <= self.x + self.width && y >= self.y && y <= self.y + self.height
}
pub fn get_overlapping_area(&self, other: &Self) -> i64 {
let x_overlap = cmp::max(
0,
cmp::min(self.x + self.width, other.x + other.width) - cmp::max(self.x, other.x),
);
let y_overlap = cmp::max(
0,
cmp::min(self.y + self.height, other.y + other.height) - cmp::max(self.y, other.y),
);
x_overlap * y_overlap
}
}
#[derive(Debug, Default)]
pub struct TranslatedCoords {
pub x_rel_root: c_int,
pub y_rel_root: c_int,
pub child: ffi::Window,
}
#[derive(Debug, Default)]
pub struct Geometry {
pub root: ffi::Window,
// If you want positions relative to the root window, use translate_coords.
// Note that the overwhelming majority of window managers are reparenting WMs, thus the window
// ID we get from window creation is for a nested window used as the window's client area. If
// you call get_geometry with that window ID, then you'll get the position of that client area
// window relative to the parent it's nested in (the frame), which isn't helpful if you want
// to know the frame position.
pub x_rel_parent: c_int,
pub y_rel_parent: c_int,
// In that same case, this will give you client area size.
pub width: c_uint,
pub height: c_uint,
// xmonad and dwm were the only WMs tested that use the border return at all.
// The majority of WMs seem to simply fill it with 0 unconditionally.
pub border: c_uint,
pub depth: c_uint,
}
#[derive(Debug, Clone)]
pub struct FrameExtents {
pub left: c_ulong,
pub right: c_ulong,
pub top: c_ulong,
pub bottom: c_ulong,
}
impl FrameExtents {
pub fn new(left: c_ulong, right: c_ulong, top: c_ulong, bottom: c_ulong) -> Self {
FrameExtents {
left,
right,
top,
bottom,
}
}
pub fn from_border(border: c_ulong) -> Self {
Self::new(border, border, border, border)
}
}
#[derive(Debug, Clone)]
pub struct LogicalFrameExtents {
pub left: f64,
pub right: f64,
pub top: f64,
pub bottom: f64,
}
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum FrameExtentsHeuristicPath {
Supported,
UnsupportedNested,
UnsupportedBordered,
}
#[derive(Debug, Clone)]
pub struct FrameExtentsHeuristic {
pub frame_extents: FrameExtents,
pub heuristic_path: FrameExtentsHeuristicPath,
}
impl FrameExtentsHeuristic {
pub fn inner_pos_to_outer(&self, x: i32, y: i32) -> (i32, i32) {
use self::FrameExtentsHeuristicPath::*;
if self.heuristic_path != UnsupportedBordered {
(
x - self.frame_extents.left as i32,
y - self.frame_extents.top as i32,
)
} else {
(x, y)
}
}
pub fn inner_size_to_outer(&self, width: u32, height: u32) -> (u32, u32) {
(
width.saturating_add(
self.frame_extents
.left
.saturating_add(self.frame_extents.right) as u32,
),
height.saturating_add(
self.frame_extents
.top
.saturating_add(self.frame_extents.bottom) as u32,
),
)
}
}
impl XConnection {
// This is adequate for inner_position
pub fn translate_coords(
&self,
window: ffi::Window,
root: ffi::Window,
) -> Result<TranslatedCoords, XError> {
let mut coords = TranslatedCoords::default();
unsafe {
(self.xlib.XTranslateCoordinates)(
self.display,
window,
root,
0,
0,
&mut coords.x_rel_root,
&mut coords.y_rel_root,
&mut coords.child,
);
}
self.check_errors()?;
Ok(coords)
}
// This is adequate for inner_size
pub fn get_geometry(&self, window: ffi::Window) -> Result<Geometry, XError> {
let mut geometry = Geometry::default();
let _status = unsafe {
(self.xlib.XGetGeometry)(
self.display,
window,
&mut geometry.root,
&mut geometry.x_rel_parent,
&mut geometry.y_rel_parent,
&mut geometry.width,
&mut geometry.height,
&mut geometry.border,
&mut geometry.depth,
)
};
self.check_errors()?;
Ok(geometry)
}
fn get_frame_extents(&self, window: ffi::Window) -> Option<FrameExtents> {
let extents_atom = unsafe { self.get_atom_unchecked(b"_NET_FRAME_EXTENTS\0") };
if !hint_is_supported(extents_atom) {
return None;
}
// Of the WMs tested, xmonad, i3, dwm, IceWM (1.3.x and earlier), and blackbox don't
// support this. As this is part of EWMH (Extended Window Manager Hints), it's likely to
// be unsupported by many smaller WMs.
let extents: Option<Vec<c_ulong>> = self
.get_property(window, extents_atom, ffi::XA_CARDINAL)
.ok();
extents.and_then(|extents| {
if extents.len() >= 4 {
Some(FrameExtents {
left: extents[0],
right: extents[1],
top: extents[2],
bottom: extents[3],
})
} else {
None
}
})
}
pub fn is_top_level(&self, window: ffi::Window, root: ffi::Window) -> Option<bool> {
let client_list_atom = unsafe { self.get_atom_unchecked(b"_NET_CLIENT_LIST\0") };
if !hint_is_supported(client_list_atom) {
return None;
}
let client_list: Option<Vec<ffi::Window>> = self
.get_property(root, client_list_atom, ffi::XA_WINDOW)
.ok();
client_list.map(|client_list| client_list.contains(&window))
}
fn get_parent_window(&self, window: ffi::Window) -> Result<ffi::Window, XError> {
let parent = unsafe {
let mut root = 0;
let mut parent = 0;
let mut children: *mut ffi::Window = ptr::null_mut();
let mut nchildren = 0;
// What's filled into `parent` if `window` is the root window?
let _status = (self.xlib.XQueryTree)(
self.display,
window,
&mut root,
&mut parent,
&mut children,
&mut nchildren,
);
// The list of children isn't used
if !children.is_null() {
(self.xlib.XFree)(children as *mut _);
}
parent
};
self.check_errors().map(|_| parent)
}
fn climb_hierarchy(
&self,
window: ffi::Window,
root: ffi::Window,
) -> Result<ffi::Window, XError> {
let mut outer_window = window;
loop {
let candidate = self.get_parent_window(outer_window)?;
if candidate == root {
break;
}
outer_window = candidate;
}
Ok(outer_window)
}
pub fn get_frame_extents_heuristic(
&self,
window: ffi::Window,
root: ffi::Window,
) -> FrameExtentsHeuristic {
use self::FrameExtentsHeuristicPath::*;
// Position relative to root window.
// With rare exceptions, this is the position of a nested window. Cases where the window
// isn't nested are outlined in the comments throghout this function, but in addition to
// that, fullscreen windows often aren't nested.
let (inner_y_rel_root, child) = {
let coords = self
.translate_coords(window, root)
.expect("Failed to translate window coordinates");
(coords.y_rel_root, coords.child)
};
let (width, height, border) = {
let inner_geometry = self
.get_geometry(window)
.expect("Failed to get inner window geometry");
(
inner_geometry.width,
inner_geometry.height,
inner_geometry.border,
)
};
// The first condition is only false for un-nested windows, but isn't always false for
// un-nested windows. Mutter/Muffin/Budgie and Marco present a mysterious discrepancy:
// when y is on the range [0, 2] and if the window has been unfocused since being
// undecorated (or was undecorated upon construction), the first condition is true,
// requiring us to rely on the second condition.
let nested = !(window == child || self.is_top_level(child, root) == Some(true));
// Hopefully the WM supports EWMH, allowing us to get exact info on the window frames.
if let Some(mut frame_extents) = self.get_frame_extents(window) {
// Mutter/Muffin/Budgie and Marco preserve their decorated frame extents when
// decorations are disabled, but since the window becomes un-nested, it's easy to
// catch.
if !nested {
frame_extents = FrameExtents::new(0, 0, 0, 0);
}
// The difference between the nested window's position and the outermost window's
// position is equivalent to the frame size. In most scenarios, this is equivalent to
// manually climbing the hierarchy as is done in the case below. Here's a list of
// known discrepancies:
// * Mutter/Muffin/Budgie gives decorated windows a margin of 9px (only 7px on top) in
// addition to a 1px semi-transparent border. The margin can be easily observed by
// using a screenshot tool to get a screenshot of a selected window, and is
// presumably used for drawing drop shadows. Getting window geometry information
// via hierarchy-climbing results in this margin being included in both the
// position and outer size, so a window positioned at (0, 0) would be reported as
// having a position (-10, -8).
// * Compiz has a drop shadow margin just like Mutter/Muffin/Budgie, though it's 10px
// on all sides, and there's no additional border.
// * Enlightenment otherwise gets a y position equivalent to inner_y_rel_root.
// Without decorations, there's no difference. This is presumably related to
// Enlightenment's fairly unique concept of window position; it interprets
// positions given to XMoveWindow as a client area position rather than a position
// of the overall window.
FrameExtentsHeuristic {
frame_extents,
heuristic_path: Supported,
}
} else if nested {
// If the position value we have is for a nested window used as the client area, we'll
// just climb up the hierarchy and get the geometry of the outermost window we're
// nested in.
let outer_window = self
.climb_hierarchy(window, root)
.expect("Failed to climb window hierarchy");
let (outer_y, outer_width, outer_height) = {
let outer_geometry = self
.get_geometry(outer_window)
.expect("Failed to get outer window geometry");
(
outer_geometry.y_rel_parent,
outer_geometry.width,
outer_geometry.height,
)
};
// Since we have the geometry of the outermost window and the geometry of the client
// area, we can figure out what's in between.
let diff_x = outer_width.saturating_sub(width);
let diff_y = outer_height.saturating_sub(height);
let offset_y = inner_y_rel_root.saturating_sub(outer_y) as c_uint;
let left = diff_x / 2;
let right = left;
let top = offset_y;
let bottom = diff_y.saturating_sub(offset_y);
let frame_extents = FrameExtents::new(
left as c_ulong,
right as c_ulong,
top as c_ulong,
bottom as c_ulong,
);
FrameExtentsHeuristic {
frame_extents,
heuristic_path: UnsupportedNested,
}
} else {
// This is the case for xmonad and dwm, AKA the only WMs tested that supplied a
// border value. This is convenient, since we can use it to get an accurate frame.
let frame_extents = FrameExtents::from_border(border as c_ulong);
FrameExtentsHeuristic {
frame_extents,
heuristic_path: UnsupportedBordered,
}
}
}
}