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// Copyright (c) 2010 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.
#import "chrome/browser/cocoa/menu_tracked_button.h"
#include <cmath>
@interface MenuTrackedButton (Private)
- (void)doHighlight:(BOOL)highlight;
- (void)checkMouseInRect;
- (NSRect)insetBounds;
- (BOOL)shouldHighlightOnHover;
@end
@implementation MenuTrackedButton
@synthesize tracking = tracking_;
- (void)updateTrackingAreas {
[super updateTrackingAreas];
[self removeTrackingRect:trackingTag_];
trackingTag_ = [self addTrackingRect:NSInsetRect([self bounds], 1, 1)
owner:self
userData:NULL
assumeInside:NO];
}
- (void)viewDidMoveToWindow {
[self updateTrackingAreas];
[self doHighlight:NO];
}
- (void)mouseEntered:(NSEvent*)theEvent {
if (!tracking_) {
didEnter_ = YES;
}
[self doHighlight:YES];
[super mouseEntered:theEvent];
}
- (void)mouseExited:(NSEvent*)theEvent {
didEnter_ = NO;
tracking_ = NO;
[self doHighlight:NO];
[super mouseExited:theEvent];
}
- (void)mouseDragged:(NSEvent*)theEvent {
tracking_ = !didEnter_;
NSPoint point = [self convertPoint:[theEvent locationInWindow] fromView:nil];
BOOL highlight = NSPointInRect(point, [self insetBounds]);
[self doHighlight:highlight];
// If tracking in non-sticky mode, poll the mouse cursor to see if it is still
// over the button and thus needs to be highlighted. The delay is the
// smallest that still produces the effect while minimizing jank. Smaller
// values make the selector fire too close to immediately/now for the mouse to
// have moved off the receiver, and larger values produce lag.
if (tracking_ && [self shouldHighlightOnHover]) {
[self performSelector:@selector(checkMouseInRect)
withObject:nil
afterDelay:0.05
inModes:[NSArray arrayWithObject:NSEventTrackingRunLoopMode]];
}
[super mouseDragged:theEvent];
}
- (void)mouseUp:(NSEvent*)theEvent {
[self doHighlight:NO];
if (!tracking_) {
return [super mouseUp:theEvent];
}
[self performClick:self];
tracking_ = NO;
}
- (void)doHighlight:(BOOL)highlight {
if (![self shouldHighlightOnHover]) {
return;
}
[[self cell] setHighlighted:highlight];
[self setNeedsDisplay];
}
// Checks if the user's current mouse location is over this button. If it is,
// the user is merely hovering here. If it is not, then disable the highlight.
// If the menu is opened in non-sticky mode, the button does not receive enter/
// exit mouse events and thus polling is necessary.
- (void)checkMouseInRect {
NSPoint point = [NSEvent mouseLocation];
point = [[self window] convertScreenToBase:point];
point = [self convertPoint:point fromView:nil];
if (!NSPointInRect(point, [self insetBounds])) {
[self doHighlight:NO];
}
}
// Returns the bounds of the receiver slightly inset to avoid highlighting both
// buttons in a pair that overlap.
- (NSRect)insetBounds {
return NSInsetRect([self bounds], 2, 1);
}
- (BOOL)shouldHighlightOnHover {
// Apple does not define NSAppKitVersionNumber10_5 when using the 10.5 SDK.
// The Internets have come up with this solution.
#ifndef NSAppKitVersionNumber10_5
#define NSAppKitVersionNumber10_5 949
#endif
// There's a cell drawing bug in 10.5 that was fixed on 10.6. Hover states
// look terrible due to this, so disable highlighting on 10.5.
return std::floor(NSAppKitVersionNumber) > NSAppKitVersionNumber10_5;
}
@end
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