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// Copyright 2013 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 "ui/app_list/cocoa/scroll_view_with_no_scrollbars.h"
#include "base/mac/mac_util.h"
#include "base/mac/scoped_cftyperef.h"
#include "base/mac/scoped_nsobject.h"
#include "base/mac/sdk_forward_declarations.h"
@interface InvisibleScroller : NSScroller;
@end
@implementation InvisibleScroller
// Makes it non-interactive (and invisible) on Lion with both 10.6 and 10.7
// SDKs. TODO(tapted): Find a way to make it non-interactive on Snow Leopard.
// TODO(tapted): Find a way to make it take up no space on Lion with a 10.6 SDK.
- (NSRect)rectForPart:(NSScrollerPart)aPart {
return NSZeroRect;
}
@end
@implementation ScrollViewWithNoScrollbars
@synthesize delegate = delegate_;
- (id)initWithFrame:(NSRect)frame {
if ((self = [super initWithFrame:frame])) {
[self setHasHorizontalScroller:base::mac::IsOSLionOrLater()];
NSRect horizontalScrollerRect = [self bounds];
horizontalScrollerRect.size.height = 0;
base::scoped_nsobject<InvisibleScroller> horizontalScroller(
[[InvisibleScroller alloc] initWithFrame:horizontalScrollerRect]);
[self setHorizontalScroller:horizontalScroller];
}
return self;
}
- (void)endGestureWithEvent:(NSEvent*)event {
[super endGestureWithEvent:event];
if (!base::mac::IsOSLionOrLater())
[delegate_ userScrolling:NO];
}
- (void)scrollWheel:(NSEvent*)event {
if ([event subtype] == NSMouseEventSubtype) {
// Since the scroll view has no vertical scroller, regular up and down mouse
// wheel events would be ignored. This maps mouse wheel events to a
// horizontal scroll event of one line, to turn pages.
BOOL downOrRight;
if ([event deltaX] != 0)
downOrRight = [event deltaX] > 0;
else if ([event deltaY] != 0)
downOrRight = [event deltaY] > 0;
else
return;
base::ScopedCFTypeRef<CGEventRef> cgEvent(CGEventCreateScrollWheelEvent(
NULL, kCGScrollEventUnitLine, 2, 0, downOrRight ? 1 : -1));
[super scrollWheel:[NSEvent eventWithCGEvent:cgEvent]];
return;
}
[super scrollWheel:event];
if (![event respondsToSelector:@selector(momentumPhase)])
return;
BOOL scrollComplete = [event momentumPhase] == NSEventPhaseEnded ||
([event momentumPhase] == NSEventPhaseNone &&
[event phase] == NSEventPhaseEnded);
[delegate_ userScrolling:!scrollComplete];
}
@end
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