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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 */
#include "ViewRegion.h"
#import <Cocoa/Cocoa.h>
#include "nsChildView.h"
using namespace mozilla;
ViewRegion::~ViewRegion() {
for (NSView* view : mViews) {
[view 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 viewsRecycled = 0;
for (auto iter = aRegion.RectIter(); !iter.Done(); iter.Next()) {
NSRect rect = aCoordinateConverter.DevPixelsToCocoaPoints(iter.Get());
NSView* view = nil;
if (viewsRecycled < viewsToRecycle.Length()) {
view = viewsToRecycle[viewsRecycled++];
} 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.frame = rect;
view.needsDisplay = YES;
for (NSView* view : Span(viewsToRecycle).From(viewsRecycled)) {
// 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.
[view removeFromSuperview];
mRegion = aRegion;
return true;