DrawContext size

src/lib.rs

@@ -11,4 +11,39 @@ pub mod prelude {
 
 pub type View = Arc<dyn Fn(&mut DrawContext) + Send + Sync>;
 
-pub struct DrawContext {}
+#[derive(Debug, Clone)]
+pub struct Size {
+    pub width: u16,
+    pub height: u16,
+}
+
+#[derive(Debug, Clone)]
+pub struct DrawContext {
+    available: Size,
+    used: Size,
+}
+
+impl DrawContext {
+    pub fn new(width: u16, height: u16) -> Self {
+        Self {
+            available: Size { width, height },
+            used: Size {
+                width: 0,
+                height: 0,
+            },
+        }
+    }
+
+    pub fn available(&self) -> &Size {
+        &self.available
+    }
+
+    pub fn used(&self) -> &Size {
+        &self.used
+    }
+
+    pub fn allocate(&mut self, width: u16, height: u16) {
+        self.used.width += width;
+        self.used.height += height;
+    }
+}