Add TrackedView to cache the view size

src/view/mod.rs

@@ -1,6 +1,7 @@
 //! Defines various views to use when creating the layout.
 
-#[macro_use]mod view_wrapper;
+#[macro_use]
+mod view_wrapper;
 
 // Essentials components
 mod position;
@@ -24,6 +25,7 @@ mod select_view;
 mod sized_view;
 mod stack_view;
 mod text_view;
+mod tracked_view;
 
 
 use std::any::Any;
@@ -50,6 +52,7 @@ pub use self::select_view::SelectView;
 pub use self::shadow_view::ShadowView;
 pub use self::stack_view::StackView;
 pub use self::text_view::TextView;
+pub use self::tracked_view::TrackedView;
 pub use self::sized_view::SizedView;
 pub use self::view_wrapper::ViewWrapper;
 

src/view/position.rs

@@ -1,4 +1,4 @@
-use ::vec::{ToVec2, Vec2};
+use vec::{ToVec2, Vec2};
 
 /// Location of the view on screen
 pub struct Position {
@@ -8,10 +8,7 @@ pub struct Position {
 
 impl Position {
     pub fn new(x: Offset, y: Offset) -> Self {
-        Position {
-            x: x,
-            y: y,
-        }
+        Position { x: x, y: y }
     }
 
     pub fn center() -> Self {

src/view/sized_view.rs

@@ -24,7 +24,7 @@ impl<T: View> ViewWrapper for SizedView<T> {
     wrap_impl!(&self.view);
 
     fn wrap_layout(&mut self, size: Vec2) {
-        self.view.layout(size);
         self.size = size;
+        self.view.layout(size);
     }
 }

src/view/tracked_view.rs

@@ -0,0 +1,30 @@
+use view::{IdView, View, ViewWrapper};
+use printer::Printer;
+use vec::Vec2;
+
+pub struct TrackedView<T: View> {
+    pub view: T,
+    pub offset: Vec2,
+}
+
+impl <T: View> TrackedView<T> {
+    pub fn new(view: T) -> Self {
+        TrackedView {
+            view: view,
+            offset: Vec2::zero(),
+        }
+    }
+
+    pub fn with_id(self, id: &str) -> IdView<Self> {
+        IdView::new(id, self)
+    }
+}
+
+impl<T: View> ViewWrapper for TrackedView<T> {
+    wrap_impl!(&self.view);
+
+    fn wrap_draw(&mut self, printer: &Printer) {
+        self.offset = printer.offset;
+        self.view.draw(printer);
+    }
+}