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-rw-r--r--widget/cocoa/ViewRegion.mm68
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diff --git a/widget/cocoa/ViewRegion.mm b/widget/cocoa/ViewRegion.mm
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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/. */
+
+#include "ViewRegion.h"
+#import <Cocoa/Cocoa.h>
+
+#include "nsChildView.h"
+
+using namespace mozilla;
+
+ViewRegion::~ViewRegion() {
+ for (size_t i = 0; i < mViews.Length(); i++) {
+ [mViews[i] removeFromSuperview];
+ }
+}
+
+bool ViewRegion::UpdateRegion(const LayoutDeviceIntRegion& aRegion,
+ const nsChildView& aCoordinateConverter,
+ NSView* aContainerView,
+ NSView* (^aViewCreationCallback)()) {
+ if (mRegion == aRegion) {
+ return false;
+ }
+
+ // We need to construct the required region using as many EffectViews
+ // as necessary. We try to update the geometry of existing views if
+ // possible, or create new ones or remove old ones if the number of
+ // rects in the region has changed.
+
+ nsTArray<NSView*> viewsToRecycle = std::move(mViews);
+ // The mViews array is now empty.
+
+ size_t i = 0;
+ for (auto iter = aRegion.RectIter();
+ !iter.Done() || i < viewsToRecycle.Length(); i++) {
+ if (!iter.Done()) {
+ NSView* view = nil;
+ NSRect rect = aCoordinateConverter.DevPixelsToCocoaPoints(iter.Get());
+ if (i < viewsToRecycle.Length()) {
+ view = viewsToRecycle[i];
+ } else {
+ view = aViewCreationCallback();
+ [aContainerView addSubview:view];
+
+ // Now that the view is in the view hierarchy, it'll be kept alive by
+ // its superview, so we can drop our reference.
+ [view release];
+ }
+ if (!NSEqualRects(rect, [view frame])) {
+ [view setFrame:rect];
+ }
+ [view setNeedsDisplay:YES];
+ mViews.AppendElement(view);
+ iter.Next();
+ } else {
+ // Our new region is made of fewer rects than the old region, so we can
+ // remove this view. We only have a weak reference to it, so removing it
+ // from the view hierarchy will release it.
+ [viewsToRecycle[i] removeFromSuperview];
+ }
+ }
+
+ mRegion = aRegion;
+ return true;
+}