Implement relative window size and position. closes #30

Cargo.toml

@@ -23,7 +23,6 @@ anyhow = "1.0"
 derive_more = "0.99"
 maplit = "1"
 structopt = "0.3"
-#ipc-channel="0.14.1"
 serde = {version = "1.0", features = ["derive"]}
 extend = "0.3.0"
 grass = "0.10"

src/app.rs

@@ -4,8 +4,7 @@ use crate::{
     eww_state,
     script_var_handler::*,
     util,
-    util::Coords,
-    value::{PrimitiveValue, VarName},
+    value::{Coords, NumWithUnit, PrimitiveValue, VarName},
     widgets,
 };
 use anyhow::*;
@@ -14,6 +13,7 @@ use debug_stub_derive::*;
 use gdk::WindowExt;
 use gtk::{ContainerExt, CssProviderExt, GtkWindowExt, StyleContextExt, WidgetExt};
 use itertools::Itertools;
+
 use std::collections::HashMap;
 
 #[derive(Debug)]
@@ -98,12 +98,7 @@ impl App {
         Ok(())
     }
 
-    fn open_window(
-        &mut self,
-        window_name: &config::WindowName,
-        pos: Option<util::Coords>,
-        size: Option<util::Coords>,
-    ) -> Result<()> {
+    fn open_window(&mut self, window_name: &config::WindowName, pos: Option<Coords>, size: Option<Coords>) -> Result<()> {
         // remove and close existing window with the same name
         let _ = self.close_window(window_name);
 
@@ -114,17 +109,26 @@ impl App {
             .context(format!("No window named '{}' defined", window_name))?
             .clone();
 
+        let display = gdk::Display::get_default().expect("could not get default display");
+        let screen_number = &window_def
+            .screen_number
+            .unwrap_or(display.get_default_screen().get_primary_monitor());
+
+        let monitor_geometry = display.get_default_screen().get_monitor_geometry(*screen_number);
+
         window_def.position = pos.unwrap_or_else(|| window_def.position);
         window_def.size = size.unwrap_or_else(|| window_def.size);
 
+        let actual_window_rect = get_window_rectangle_in_screen(monitor_geometry, window_def.position, window_def.size);
+
         let window = gtk::Window::new(gtk::WindowType::Popup);
         window.set_title(&format!("Eww - {}", window_name));
         let wm_class_name = format!("eww-{}", window_name);
         window.set_wmclass(&wm_class_name, &wm_class_name);
         window.set_type_hint(gdk::WindowTypeHint::Dock);
         window.set_position(gtk::WindowPosition::Center);
-        window.set_default_size(window_def.size.0, window_def.size.1);
-        window.set_size_request(window_def.size.0, window_def.size.1);
+        window.set_default_size(actual_window_rect.width, actual_window_rect.height);
+        window.set_size_request(actual_window_rect.width, actual_window_rect.height);
         window.set_decorated(false);
         window.set_resizable(false);
 
@@ -151,7 +155,7 @@ impl App {
 
         let gdk_window = window.get_window().context("couldn't get gdk window from gtk window")?;
         gdk_window.set_override_redirect(true);
-        gdk_window.move_(window_def.position.0, window_def.position.1);
+        gdk_window.move_(actual_window_rect.x, actual_window_rect.y);
         gdk_window.show();
 
         if window_def.stacking == WindowStacking::Foreground {
@@ -208,3 +212,25 @@ fn on_screen_changed(window: &gtk::Window, _old_screen: Option<&gdk::Screen>) {
     });
     window.set_visual(visual.as_ref());
 }
+
+/// Calculate the window rectangle given the configured window [`pos`] and [`size`], which might be relative to the screen size.
+fn get_window_rectangle_in_screen(screen_rect: gdk::Rectangle, pos: Coords, size: Coords) -> gdk::Rectangle {
+    gdk::Rectangle {
+        x: match pos.x {
+            NumWithUnit::Percent(n) => (screen_rect.width as f64 / 100.0).floor() as i32 * n,
+            NumWithUnit::Pixels(n) => screen_rect.x + n,
+        },
+        y: match pos.y {
+            NumWithUnit::Percent(n) => (screen_rect.height as f64 / 100.0).floor() as i32 * n,
+            NumWithUnit::Pixels(n) => screen_rect.y + n,
+        },
+        width: match size.x {
+            NumWithUnit::Percent(n) => (screen_rect.width as f64 / 100.0).floor() as i32 * n,
+            NumWithUnit::Pixels(n) => n,
+        },
+        height: match size.y {
+            NumWithUnit::Percent(n) => (screen_rect.height as f64 / 100.0).floor() as i32 * n,
+            NumWithUnit::Pixels(n) => n,
+        },
+    }
+}

src/config/mod.rs

@@ -1,13 +1,12 @@
 use crate::{
     util,
-    value::{PrimitiveValue, VarName},
+    value::{Coords, PrimitiveValue, VarName},
 };
 use anyhow::*;
 use derive_more;
 use element::*;
 use serde::{Deserialize, Serialize};
 use std::{collections::HashMap, fmt};
-use util::Coords;
 use xml_ext::*;
 
 pub mod element;
@@ -204,6 +203,7 @@ pub struct EwwWindowDefinition {
     pub position: Coords,
     pub size: Coords,
     pub stacking: WindowStacking,
+    pub screen_number: Option<i32>,
     pub widget: WidgetUse,
 }
 
@@ -212,16 +212,12 @@ impl EwwWindowDefinition {
         ensure_xml_tag_is!(xml, "window");
 
         let size_node = xml.child("size")?;
-        let size = Coords(size_node.attr("x")?.parse()?, size_node.attr("y")?.parse()?);
+        let size = Coords::from_strs(size_node.attr("x")?, size_node.attr("y")?)?;
         let pos_node = xml.child("pos")?;
-        let position = Coords(pos_node.attr("x")?.parse()?, pos_node.attr("y")?.parse()?);
+        let position = Coords::from_strs(pos_node.attr("x")?, pos_node.attr("y")?)?;
 
-        let stacking = xml
-            .attr("stacking")
-            .ok()
-            .map(|stacking| stacking.parse::<WindowStacking>())
-            .transpose()?
-            .unwrap_or_else(WindowStacking::default);
+        let stacking = xml.attr("stacking").ok().map(|x| x.parse()).transpose()?.unwrap_or_default();
+        let screen_number = xml.attr("screen").ok().map(|x| x.parse()).transpose()?;
 
         let widget = WidgetUse::from_xml_node(xml.child("widget")?.only_child()?)?;
         Ok(EwwWindowDefinition {
@@ -229,6 +225,7 @@ impl EwwWindowDefinition {
             size,
             widget,
             stacking,
+            screen_number,
         })
     }
 }

src/main.rs

@@ -21,6 +21,7 @@ use std::{
     path::{Path, PathBuf},
 };
 use structopt::StructOpt;
+use value::Coords;
 
 pub mod app;
 pub mod config;
@@ -90,10 +91,10 @@ pub enum OptAction {
         window_name: config::WindowName,
 
         #[structopt(short, long, help = "The position of the window, where it should open.")]
-        pos: Option<util::Coords>,
+        pos: Option<Coords>,
 
         #[structopt(short, long, help = "The size of the window to open")]
-        size: Option<util::Coords>,
+        size: Option<Coords>,
     },
 
     #[structopt(name = "close", help = "close the window with the given name")]

src/util.rs

@@ -2,8 +2,7 @@ use anyhow::*;
 use extend::ext;
 use grass;
 use itertools::Itertools;
-use serde::{Deserialize, Serialize};
-use std::{fmt, path::Path};
+use std::path::Path;
 
 #[macro_export]
 macro_rules! impl_try_from {
@@ -59,30 +58,6 @@ pub fn parse_duration(s: &str) -> Result<std::time::Duration> {
     }
 }
 
-#[derive(Debug, Clone, Copy, Deserialize, Serialize, PartialEq, Eq)]
-pub struct Coords(pub i32, pub i32);
-
-impl fmt::Display for Coords {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        write!(f, "{}x{}", self.0, self.1)
-    }
-}
-
-impl std::str::FromStr for Coords {
-    type Err = anyhow::Error;
-
-    fn from_str(s: &str) -> Result<Self> {
-        let (x, y) = s.split_once('x').ok_or_else(|| anyhow!("must be formatted like 200x500"))?;
-        Ok(Coords(x.parse()?, y.parse()?))
-    }
-}
-
-impl From<(i32, i32)> for Coords {
-    fn from((x, y): (i32, i32)) -> Self {
-        Coords(x, y)
-    }
-}
-
 /// Replace all env-var references of the format `"something $foo"` in a string
 /// by the actual env-variables. If the env-var isn't found, will replace the
 /// reference with an empty string.

src/value/coords.rs

@@ -0,0 +1,81 @@
+use anyhow::*;
+use serde::{Deserialize, Serialize};
+use std::{fmt, str::FromStr};
+
+#[derive(Clone, Copy, PartialEq, Eq, Deserialize, Serialize)]
+pub enum NumWithUnit {
+    Percent(i32),
+    Pixels(i32),
+}
+
+impl fmt::Debug for NumWithUnit {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "{}", self)
+    }
+}
+
+impl fmt::Display for NumWithUnit {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            NumWithUnit::Percent(x) => write!(f, "{}%", x),
+            NumWithUnit::Pixels(x) => write!(f, "{}px", x),
+        }
+    }
+}
+
+impl FromStr for NumWithUnit {
+    type Err = anyhow::Error;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        lazy_static::lazy_static! {
+            static ref PATTERN: regex::Regex = regex::Regex::new("^(\\d+)(.*)$").unwrap();
+        };
+
+        let captures = PATTERN.captures(s).with_context(|| format!("could not parse '{}'", s))?;
+        let value = captures.get(1).unwrap().as_str().parse::<i32>()?;
+        let value = match captures.get(2).unwrap().as_str() {
+            "px" | "" => NumWithUnit::Pixels(value),
+            "%" => NumWithUnit::Percent(value),
+            _ => bail!("couldn't parse {}, unit must be either px or %", s),
+        };
+        Ok(value)
+    }
+}
+
+#[derive(Clone, Copy, PartialEq, Eq, Deserialize, Serialize)]
+pub struct Coords {
+    pub x: NumWithUnit,
+    pub y: NumWithUnit,
+}
+
+impl FromStr for Coords {
+    type Err = anyhow::Error;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let (x, y) = s
+            .split_once(|x: char| x.to_ascii_lowercase() == 'x')
+            .ok_or_else(|| anyhow!("must be formatted like 200x500"))?;
+        Coords::from_strs(x, y)
+    }
+}
+
+impl fmt::Display for Coords {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "{}X{}", self.x, self.y)
+    }
+}
+
+impl fmt::Debug for Coords {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "CoordsWithUnits({}, {})", self.x, self.y)
+    }
+}
+
+impl Coords {
+    pub fn from_strs(x: &str, y: &str) -> Result<Coords> {
+        Ok(Coords {
+            x: x.parse()?,
+            y: y.parse()?,
+        })
+    }
+}

src/value/mod.rs

@@ -4,8 +4,10 @@ use serde::{Deserialize, Serialize};
 use std::fmt;
 
 pub mod attr_value;
+pub mod coords;
 pub mod primitive;
 pub use attr_value::*;
+pub use coords::*;
 pub use primitive::*;
 
 /// The name of a variable

src/widgets/widget_definitions.rs

@@ -227,7 +227,7 @@ fn build_gtk_box(bargs: &mut BuilderArgs) -> Result<gtk::Box> {
         // @prop orientation - orientation of the box. possible values: $orientation
         prop(orientation: as_string) { gtk_widget.set_orientation(parse_orientation(&orientation)?) },
         // @prop space-evenly - space the widgets evenly.
-        prop(space_evenly: as_bool = true) { gtk_widget.set_homogeneous(space_evenly) },
+        prop(space_evenly: as_bool = false) { gtk_widget.set_homogeneous(space_evenly) },
     });
     Ok(gtk_widget)
 }