Index: ash/common/wm/forwarding_layer_delegate.cc |
diff --git a/ash/common/wm/forwarding_layer_delegate.cc b/ash/common/wm/forwarding_layer_delegate.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..822fd675a1a16d9d2e836c752b509cd039d8dbf6 |
--- /dev/null |
+++ b/ash/common/wm/forwarding_layer_delegate.cc |
@@ -0,0 +1,56 @@ |
+// Copyright 2016 The Chromium Authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+#include "ash/common/wm/forwarding_layer_delegate.h" |
+ |
+#include "ash/common/wm_window.h" |
+#include "base/callback.h" |
+#include "ui/compositor/layer.h" |
+ |
+namespace ash { |
+namespace wm { |
+ |
+ForwardingLayerDelegate::ForwardingLayerDelegate(WmWindow* original_window, |
+ ui::LayerDelegate* delegate) |
+ : original_window_(original_window), original_delegate_(delegate) {} |
+ |
+ForwardingLayerDelegate::~ForwardingLayerDelegate() {} |
+ |
+void ForwardingLayerDelegate::OnPaintLayer(const ui::PaintContext& context) { |
+ if (!original_delegate_) |
+ return; |
+ // |original_delegate_| may have already been deleted or |
+ // disconnected by this time. Check if |original_delegate_| is still |
+ // used by the original_window tree, or skip otherwise. |
+ if (IsDelegateValid(original_window_->GetLayer())) |
+ original_delegate_->OnPaintLayer(context); |
+ else |
+ original_delegate_ = nullptr; |
+} |
+ |
+void ForwardingLayerDelegate::OnDelegatedFrameDamage( |
+ const gfx::Rect& damage_rect_in_dip) {} |
+ |
+void ForwardingLayerDelegate::OnDeviceScaleFactorChanged( |
+ float device_scale_factor) { |
+ // Don't tell the original delegate about device scale factor change |
+ // on cloned layer because the original layer is still on the same display. |
+} |
+ |
+base::Closure ForwardingLayerDelegate::PrepareForLayerBoundsChange() { |
+ return base::Closure(); |
+} |
+ |
+bool ForwardingLayerDelegate::IsDelegateValid(ui::Layer* layer) const { |
+ if (layer->delegate() == original_delegate_) |
+ return true; |
+ for (auto* child : layer->children()) { |
+ if (IsDelegateValid(child)) |
+ return true; |
+ } |
+ return false; |
+} |
+ |
+} // namespace wm |
+} // namespace ash |