Create module boundaries for pane_grid logic

native/src/widget/pane_grid/split.rs

@@ -0,0 +1,54 @@
+use crate::Rectangle;
+
+#[derive(Debug, Clone, Copy, Hash, PartialEq, Eq)]
+pub enum Split {
+    Horizontal,
+    Vertical,
+}
+
+impl Split {
+    pub(super) fn apply(
+        &self,
+        rectangle: &Rectangle,
+        ratio: f32,
+        halved_spacing: f32,
+    ) -> (Rectangle, Rectangle) {
+        match self {
+            Split::Horizontal => {
+                let width_left =
+                    (rectangle.width * ratio).round() - halved_spacing;
+                let width_right = rectangle.width - width_left - halved_spacing;
+
+                (
+                    Rectangle {
+                        width: width_left,
+                        ..*rectangle
+                    },
+                    Rectangle {
+                        x: rectangle.x + width_left + halved_spacing,
+                        width: width_right,
+                        ..*rectangle
+                    },
+                )
+            }
+            Split::Vertical => {
+                let height_top =
+                    (rectangle.height * ratio).round() - halved_spacing;
+                let height_bottom =
+                    rectangle.height - height_top - halved_spacing;
+
+                (
+                    Rectangle {
+                        height: height_top,
+                        ..*rectangle
+                    },
+                    Rectangle {
+                        y: rectangle.y + height_top + halved_spacing,
+                        height: height_bottom,
+                        ..*rectangle
+                    },
+                )
+            }
+        }
+    }
+}