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-rw-r--r--widget/cocoa/ViewRegion.h53
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diff --git a/widget/cocoa/ViewRegion.h b/widget/cocoa/ViewRegion.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef ViewRegion_h
+#define ViewRegion_h
+
+#include "Units.h"
+#include "nsTArray.h"
+
+@class NSView;
+
+namespace mozilla {
+
+/**
+ * Manages a set of NSViews to cover a LayoutDeviceIntRegion.
+ */
+class ViewRegion {
+public:
+ ~ViewRegion();
+
+ mozilla::LayoutDeviceIntRegion Region() { return mRegion; }
+
+ /**
+ * Update the region.
+ * @param aRegion The new region.
+ * @param aCoordinateConverter The nsChildView to use for converting
+ * LayoutDeviceIntRect device pixel coordinates into Cocoa NSRect coordinates.
+ * @param aContainerView The view that's going to be the superview of the
+ * NSViews which will be created for this region.
+ * @param aViewCreationCallback A block that instantiates new NSViews.
+ * @return Whether or not the region changed.
+ */
+ bool UpdateRegion(const mozilla::LayoutDeviceIntRegion& aRegion,
+ const nsChildView& aCoordinateConverter,
+ NSView* aContainerView,
+ NSView* (^aViewCreationCallback)());
+
+ /**
+ * Return an NSView from the region, if there is any.
+ */
+ NSView* GetAnyView() { return mViews.Length() > 0 ? mViews[0] : nil; }
+
+private:
+ mozilla::LayoutDeviceIntRegion mRegion;
+ nsTArray<NSView*> mViews;
+};
+
+} // namespace mozilla
+
+#endif // ViewRegion_h