Initial cut at layerless windows.

ui/aura/window.h

Index: ui/aura/window.h
diff --git a/ui/aura/window.h b/ui/aura/window.h
index ea3846109e62f27969fc8d2256a643845ae0406d..62e5e9ce355d67208c2c5c38bd70b18a98b4683f 100644
--- a/ui/aura/window.h
+++ b/ui/aura/window.h
@@ -16,6 +16,7 @@
 #include "base/strings/string16.h"
 #include "ui/aura/aura_export.h"
 #include "ui/aura/client/window_types.h"
+#include "ui/aura/window_layer_type.h"
 #include "ui/aura/window_observer.h"
 #include "ui/compositor/layer_animator.h"
 #include "ui/compositor/layer_delegate.h"
@@ -31,6 +32,7 @@
 namespace gfx {
 class Display;
 class Transform;
+class Vector2d;
 }
 
 namespace ui {
@@ -73,6 +75,9 @@ class AURA_EXPORT Window : public ui::LayerDelegate,
   // Initializes the window. This creates the window's layer.
   void Init(ui::LayerType layer_type);
 
+  // TODO(sky): replace other Init() with this once m32 is more baked.
+  void InitWithWindowLayerType(WindowLayerType layer_type);
+
   // Creates a new layer for the window. Erases the layer-owned bounds, so the
   // caller may wish to set new bounds and other state on the window/layer.
   // Returns the old layer, which can be used for animations. Caller owns the
@@ -106,7 +111,7 @@ class AURA_EXPORT Window : public ui::LayerDelegate,
   WindowDelegate* delegate() { return delegate_; }
   const WindowDelegate* delegate() const { return delegate_; }
 
-  const gfx::Rect& bounds() const;
+  const gfx::Rect& bounds() const { return bounds_; }
 
   Window* parent() { return parent_; }
   const Window* parent() const { return parent_; }
@@ -406,6 +411,22 @@ class AURA_EXPORT Window : public ui::LayerDelegate,
   // to.
   void RemoveChildImpl(Window* child, Window* new_parent);
 
+  // If this Window has a layer the layer's parent is set to NULL, otherwise
+  // UnparentLayers() is invoked on all the children. |offset| is the offset
+  // relative to the nearest ancestor with a layer.
+  void UnparentLayers(bool has_layerless_ancestor,
+                      const gfx::Vector2d& offset);
+
+  // If this Window has a layer it is added to |parent| and the origin set to
+  // |offset|. Otherwise this recurses through the children invoking
+  // ReparentLayers(). The net effect is both setting the parent of layers to
+  // |parent| as well as updating bounds of windows with a layerless ancestor.
+  void ReparentLayers(ui::Layer* parent, const gfx::Vector2d& offset);
+
+  // Offsets the first encountered Windows with layers by |offset|. This
+  // recurses through all layerless Windows, stopping at windows with layers.
+  void OffsetLayerBounds(const gfx::Vector2d& offset);
+
   // Called when this window's parent has changed.
   void OnParentChanged();
 
@@ -468,11 +489,12 @@ class AURA_EXPORT Window : public ui::LayerDelegate,
   // Notifies this window and its parent hierarchy.
   void NotifyWindowVisibilityChangedUp(aura::Window* target, bool visible);
 
-  // Invoked from the closure returned by PrepareForLayerBoundsChange() after
-  // the bounds of the layer has changed. |old_bounds| is the previous bounds of
-  // the layer, and |contained_mouse| is true if the mouse was previously within
-  // the window's bounds.
-  void OnLayerBoundsChanged(const gfx::Rect& old_bounds, bool contained_mouse);
+  // Invoked when the bounds of the window changes. This may be invoked directly
+  // by us, or from the closure returned by PrepareForLayerBoundsChange() after
+  // the bounds of the layer has changed. |old_bounds| is the previous bounds,
+  // and |contained_mouse| is true if the mouse was previously within the
+  // window's bounds.
+  void OnWindowBoundsChanged(const gfx::Rect& old_bounds, bool contained_mouse);
 
   // Overridden from ui::LayerDelegate:
   virtual void OnPaintLayer(gfx::Canvas* canvas) OVERRIDE;
@@ -488,6 +510,22 @@ class AURA_EXPORT Window : public ui::LayerDelegate,
   // Returns true if the mouse is currently within our bounds.
   bool ContainsMouse();
 
+  // Returns the first ancestor (starting at |this|) with a layer. |offset| is
+  // set to the offset from |this| to the first ancestor with a layer.
+  Window* GetAncestorWithLayer(gfx::Vector2d* offset) {
+    return const_cast<Window*>(
+        const_cast<const Window*>(this)->GetAncestorWithLayer(offset));
+  }
+  const Window* GetAncestorWithLayer(gfx::Vector2d* offset) const;
+
+  bool is_layerless() const { return layer_ == NULL; }

[Ben Goodger (Google), 2013/12/02 22:12:52]

do we really want this? vs. !!layer()?

if we do, I'd make this method be has_layer() and write the checks as
!has_layer()

+
+  // Bounds of this window relative to the parent. This is cached as the bounds
+  // of the Layer and Window are not necessarily the same. In particular bounds
+  // of the Layer are relative to the first ancestor with a Layer, where as this
+  // is relative to the parent Window.
+  gfx::Rect bounds_;
+
   WindowEventDispatcher* dispatcher_;
 
   client::WindowType type_;