feat(move-floating-window): percentage change (#2371)

* feat: add percentage change to move-floating-window

* fixes

---------

Co-authored-by: Ivan Molodetskikh <yalterz@gmail.com>

niri-ipc/src/lib.rs

@@ -813,14 +813,14 @@ pub enum Action {
         /// How to change the X position.
         #[cfg_attr(
             feature = "clap",
-            arg(short, long, default_value = "+0", allow_negative_numbers = true)
+            arg(short, long, default_value = "+0", allow_hyphen_values = true)
         )]
         x: PositionChange,
 
         /// How to change the Y position.
         #[cfg_attr(
             feature = "clap",
-            arg(short, long, default_value = "+0", allow_negative_numbers = true)
+            arg(short, long, default_value = "+0", allow_hyphen_values = true)
         )]
         y: PositionChange,
     },
@@ -913,8 +913,12 @@ pub enum SizeChange {
 pub enum PositionChange {
     /// Set the position in logical pixels.
     SetFixed(f64),
+    /// Set the position as a proportion of the working area.
+    SetProportion(f64),
     /// Add or subtract to the current position in logical pixels.
     AdjustFixed(f64),
+    /// Add or subtract to the current position as a proportion of the working area.
+    AdjustProportion(f64),
 }
 
 /// Workspace reference (id, index or name) to operate on.
@@ -1519,17 +1523,38 @@ impl FromStr for PositionChange {
     type Err = &'static str;
 
     fn from_str(s: &str) -> Result<Self, Self::Err> {
-        let value = s;
-        match value.bytes().next() {
-            Some(b'-' | b'+') => {
-                let value = value.parse().map_err(|_| "error parsing value")?;
-                Ok(Self::AdjustFixed(value))
+        match s.split_once('%') {
+            Some((value, empty)) => {
+                if !empty.is_empty() {
+                    return Err("trailing characters after '%' are not allowed");
+                }
+
+                match value.bytes().next() {
+                    Some(b'-' | b'+') => {
+                        let value = value.parse().map_err(|_| "error parsing value")?;
+                        Ok(Self::AdjustProportion(value))
+                    }
+                    Some(_) => {
+                        let value = value.parse().map_err(|_| "error parsing value")?;
+                        Ok(Self::SetProportion(value))
+                    }
+                    None => Err("value is missing"),
+                }
             }
-            Some(_) => {
-                let value = value.parse().map_err(|_| "error parsing value")?;
-                Ok(Self::SetFixed(value))
+            None => {
+                let value = s;
+                match value.bytes().next() {
+                    Some(b'-' | b'+') => {
+                        let value = value.parse().map_err(|_| "error parsing value")?;
+                        Ok(Self::AdjustFixed(value))
+                    }
+                    Some(_) => {
+                        let value = value.parse().map_err(|_| "error parsing value")?;
+                        Ok(Self::SetFixed(value))
+                    }
+                    None => Err("value is missing"),
+                }
             }
-            None => Err("value is missing"),
         }
     }
 }
@@ -1686,9 +1711,18 @@ mod tests {
             PositionChange::AdjustFixed(-10.),
         );
 
-        assert!("10%".parse::<PositionChange>().is_err());
-        assert!("+10%".parse::<PositionChange>().is_err());
-        assert!("-10%".parse::<PositionChange>().is_err());
+        assert_eq!(
+            "10%".parse::<PositionChange>().unwrap(),
+            PositionChange::SetProportion(10.)
+        );
+        assert_eq!(
+            "+10%".parse::<PositionChange>().unwrap(),
+            PositionChange::AdjustProportion(10.)
+        );
+        assert_eq!(
+            "-10%".parse::<PositionChange>().unwrap(),
+            PositionChange::AdjustProportion(-10.)
+        );
         assert!("-".parse::<PositionChange>().is_err());
         assert!("10% ".parse::<PositionChange>().is_err());
     }

src/layout/floating.rs

@@ -961,17 +961,42 @@ impl<W: LayoutElement> FloatingSpace<W> {
         };
         let idx = self.idx_of(id).unwrap();
 
-        let mut new_pos = self.data[idx].logical_pos;
+        let mut pos = self.data[idx].logical_pos;
+
+        let available_width = self.working_area.size.w;
+        let available_height = self.working_area.size.h;
+        let working_area_loc = self.working_area.loc;
+
+        const MAX_F: f64 = 10000.;
+
         match x {
-            PositionChange::SetFixed(x) => new_pos.x = x + self.working_area.loc.x,
-            PositionChange::AdjustFixed(x) => new_pos.x += x,
+            PositionChange::SetFixed(x) => pos.x = x + working_area_loc.x,
+            PositionChange::SetProportion(prop) => {
+                let prop = (prop / 100.).clamp(0., MAX_F);
+                pos.x = available_width * prop + working_area_loc.x;
+            }
+            PositionChange::AdjustFixed(x) => pos.x += x,
+            PositionChange::AdjustProportion(prop) => {
+                let current_prop = (pos.x - working_area_loc.x) / available_width.max(1.);
+                let prop = (current_prop + prop / 100.).clamp(0., MAX_F);
+                pos.x = available_width * prop + working_area_loc.x;
+            }
         }
         match y {
-            PositionChange::SetFixed(y) => new_pos.y = y + self.working_area.loc.y,
-            PositionChange::AdjustFixed(y) => new_pos.y += y,
+            PositionChange::SetFixed(y) => pos.y = y + working_area_loc.y,
+            PositionChange::SetProportion(prop) => {
+                let prop = (prop / 100.).clamp(0., MAX_F);
+                pos.y = available_height * prop + working_area_loc.y;
+            }
+            PositionChange::AdjustFixed(y) => pos.y += y,
+            PositionChange::AdjustProportion(prop) => {
+                let current_prop = (pos.y - working_area_loc.y) / available_height.max(1.);
+                let prop = (current_prop + prop / 100.).clamp(0., MAX_F);
+                pos.y = available_height * prop + working_area_loc.y;
+            }
         }
 
-        self.move_to(idx, new_pos, animate);
+        self.move_to(idx, pos, animate);
     }
 
     pub fn center_window(&mut self, id: Option<&W::Id>) {

src/layout/tests.rs

@@ -311,7 +311,9 @@ fn arbitrary_size_change() -> impl Strategy<Value = SizeChange> {
 fn arbitrary_position_change() -> impl Strategy<Value = PositionChange> {
     prop_oneof![
         (-1000f64..1000f64).prop_map(PositionChange::SetFixed),
+        any::<f64>().prop_map(PositionChange::SetProportion),
         (-1000f64..1000f64).prop_map(PositionChange::AdjustFixed),
+        any::<f64>().prop_map(PositionChange::AdjustProportion),
         any::<f64>().prop_map(PositionChange::SetFixed),
         any::<f64>().prop_map(PositionChange::AdjustFixed),
     ]

src/layout/workspace.rs

@@ -1511,14 +1511,18 @@ impl<W: LayoutElement> Workspace<W> {
                 return;
             };
 
-            let working_area_loc = self.floating.working_area().loc;
             let pos = self.floating.stored_or_default_tile_pos(tile);
 
             // If there's no stored floating position, we can only set both components at once, not
             // adjust.
             let pos = pos.or_else(|| {
-                (matches!(x, PositionChange::SetFixed(_))
-                    && matches!(y, PositionChange::SetFixed(_)))
+                (matches!(
+                    x,
+                    PositionChange::SetFixed(_) | PositionChange::SetProportion(_)
+                ) && matches!(
+                    y,
+                    PositionChange::SetFixed(_) | PositionChange::SetProportion(_)
+                ))
                 .then_some(Point::default())
             });
 
@@ -1526,13 +1530,38 @@ impl<W: LayoutElement> Workspace<W> {
                 return;
             };
 
+            let working_area = self.floating.working_area();
+            let available_width = working_area.size.w;
+            let available_height = working_area.size.h;
+            let working_area_loc = working_area.loc;
+
+            const MAX_F: f64 = 10000.;
+
             match x {
                 PositionChange::SetFixed(x) => pos.x = x + working_area_loc.x,
+                PositionChange::SetProportion(prop) => {
+                    let prop = (prop / 100.).clamp(0., MAX_F);
+                    pos.x = available_width * prop + working_area_loc.x;
+                }
                 PositionChange::AdjustFixed(x) => pos.x += x,
+                PositionChange::AdjustProportion(prop) => {
+                    let current_prop = (pos.x - working_area_loc.x) / available_width.max(1.);
+                    let prop = (current_prop + prop / 100.).clamp(0., MAX_F);
+                    pos.x = available_width * prop + working_area_loc.x;
+                }
             }
             match y {
                 PositionChange::SetFixed(y) => pos.y = y + working_area_loc.y,
+                PositionChange::SetProportion(prop) => {
+                    let prop = (prop / 100.).clamp(0., MAX_F);
+                    pos.y = available_height * prop + working_area_loc.y;
+                }
                 PositionChange::AdjustFixed(y) => pos.y += y,
+                PositionChange::AdjustProportion(prop) => {
+                    let current_prop = (pos.y - working_area_loc.y) / available_height.max(1.);
+                    let prop = (current_prop + prop / 100.).clamp(0., MAX_F);
+                    pos.y = available_height * prop + working_area_loc.y;
+                }
             }
 
             let pos = self.floating.logical_to_size_frac(pos);