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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#import "ui/base/test/scoped_preferred_scroller_style_mac.h"
#import <AppKit/AppKit.h>
#import "base/apple/scoped_objc_class_swizzler.h"
#include "base/check.h"
using base::apple::ScopedObjCClassSwizzler;
namespace {
// Swizzling can be stacked, but not interleaved without creating unexpected
// states. Require that there is only one swizzler rather than tracking a stack.
bool g_swizzling = false;
void NotifyStyleChanged() {
[[NSNotificationCenter defaultCenter]
postNotificationName:NSPreferredScrollerStyleDidChangeNotification
object:nil];
}
NSScrollerStyle GetScrollerStyle(bool overlay) {
return overlay ? NSScrollerStyleOverlay : NSScrollerStyleLegacy;
}
} // namespace
// Donates a testing implementation of +[NSScroller preferredScrollerStyle] by
// returning NSScrollerStyleLegacy.
@interface FakeNSScrollerPreferredStyleLegacyDonor : NSObject
@end
@implementation FakeNSScrollerPreferredStyleLegacyDonor
+ (NSInteger)preferredScrollerStyle {
return NSScrollerStyleLegacy;
}
@end
// Donates a testing implementation of +[NSScroller preferredScrollerStyle] by
// returning NSScrollerStyleOverlay.
@interface FakeNSScrollerPreferredStyleOverlayDonor : NSObject
@end
@implementation FakeNSScrollerPreferredStyleOverlayDonor
+ (NSInteger)preferredScrollerStyle {
return NSScrollerStyleOverlay;
}
@end
namespace ui::test {
ScopedPreferredScrollerStyle::ScopedPreferredScrollerStyle(bool overlay)
: overlay_(overlay) {
NSInteger previous_style = [NSScroller preferredScrollerStyle];
Class style_class = overlay_
? [FakeNSScrollerPreferredStyleOverlayDonor class]
: [FakeNSScrollerPreferredStyleLegacyDonor class];
DCHECK(!g_swizzling);
g_swizzling = true;
swizzler_ = std::make_unique<ScopedObjCClassSwizzler>(
[NSScroller class], style_class, @selector(preferredScrollerStyle));
if (previous_style != GetScrollerStyle(overlay_))
NotifyStyleChanged();
}
ScopedPreferredScrollerStyle::~ScopedPreferredScrollerStyle() {
swizzler_.reset();
DCHECK(g_swizzling);
g_swizzling = false;
if ([NSScroller preferredScrollerStyle] != GetScrollerStyle(overlay_))
NotifyStyleChanged();
}
} // namespace ui::test
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