1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
|
// Copyright (c) 2012 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/ui/cocoa/history_overlay_controller.h"
#include "base/logging.h"
#include "grit/theme_resources.h"
#include "ui/base/resource/resource_bundle.h"
#include "ui/gfx/image/image.h"
#import <QuartzCore/QuartzCore.h>
#include <cmath>
// Constants ///////////////////////////////////////////////////////////////////
// The radius of the circle drawn in the shield.
const CGFloat kShieldRadius = 70;
// The diameter of the circle and the width of its bounding box.
const CGFloat kShieldWidth = kShieldRadius * 2;
// The height of the shield.
const CGFloat kShieldHeight = 140;
// The amount of |gestureAmount| at which AppKit considers the gesture
// completed. This was derived more via art than science.
const CGFloat kGestureCompleteProgress = 0.3;
// HistoryOverlayView //////////////////////////////////////////////////////////
// The content view that draws the semicircle and the arrow.
@interface HistoryOverlayView : NSView {
@private
HistoryOverlayMode mode_;
CGFloat progress_;
}
@property(nonatomic) CGFloat progress;
- (id)initWithMode:(HistoryOverlayMode)mode
image:(NSImage*)image;
@end
@implementation HistoryOverlayView
@synthesize progress = progress_;
- (id)initWithMode:(HistoryOverlayMode)mode
image:(NSImage*)image {
NSRect frame = NSMakeRect(0, 0, kShieldWidth, kShieldHeight);
if ((self = [super initWithFrame:frame])) {
mode_ = mode;
// If going backward, the arrow needs to be in the right half of the circle,
// so offset the X position.
CGFloat offset = mode_ == kHistoryOverlayModeBack ? kShieldRadius : 0;
NSRect arrowRect = NSMakeRect(offset, 0, kShieldRadius, kShieldHeight);
arrowRect = NSInsetRect(arrowRect, 10, 0); // Give a little padding.
scoped_nsobject<NSImageView> imageView(
[[NSImageView alloc] initWithFrame:arrowRect]);
[imageView setImage:image];
[self addSubview:imageView];
}
return self;
}
- (void)drawRect:(NSRect)dirtyRect {
NSRect ovalRect = NSMakeRect(0, 0, kShieldWidth, kShieldHeight);
NSBezierPath* path = [NSBezierPath bezierPathWithOvalInRect:ovalRect];
NSColor* fillColor =
// Clamp the minimum ligtness to be 0.666.
[NSColor colorWithCalibratedWhite:std::min(2.0/3.0 - progress_, 2.0/3.0)
alpha:0.85];
[fillColor set];
[path fill];
}
@end
// HistoryOverlayController ////////////////////////////////////////////////////
@implementation HistoryOverlayController
- (id)initForMode:(HistoryOverlayMode)mode {
if ((self = [super init])) {
mode_ = mode;
DCHECK(mode == kHistoryOverlayModeBack ||
mode == kHistoryOverlayModeForward);
}
return self;
}
- (void)loadView {
const gfx::Image& image =
ui::ResourceBundle::GetSharedInstance().GetNativeImageNamed(
mode_ == kHistoryOverlayModeBack ? IDR_SWIPE_BACK
: IDR_SWIPE_FORWARD);
contentView_.reset(
[[HistoryOverlayView alloc] initWithMode:mode_
image:image.ToNSImage()]);
self.view = contentView_;
}
- (void)setProgress:(CGFloat)gestureAmount {
NSRect parentFrame = [parent_ frame];
// Scale the gesture amount so that the progress is indicative of the gesture
// being completed.
gestureAmount = std::abs(gestureAmount) / kGestureCompleteProgress;
// Compute the new position based on the progress.
NSRect frame = self.view.frame;
frame.origin.y = (NSHeight(parentFrame) / 2) - (kShieldHeight / 2);
CGFloat width = std::min(kShieldRadius * gestureAmount, kShieldRadius);
if (mode_ == kHistoryOverlayModeForward)
frame.origin.x = NSMaxX(parentFrame) - width;
else if (mode_ == kHistoryOverlayModeBack)
frame.origin.x = NSMinX(parentFrame) - kShieldWidth + width;
self.view.frame = frame;
[contentView_ setProgress:gestureAmount];
[contentView_ setNeedsDisplay:YES];
}
- (void)showPanelForView:(NSView*)view {
parent_.reset([view retain]);
[self setProgress:0]; // Set initial view position.
[[parent_ superview] addSubview:self.view
positioned:NSWindowAbove
relativeTo:parent_];
}
- (void)dismiss {
const CGFloat kFadeOutDurationSeconds = 0.2;
NSView* overlay = self.view;
scoped_nsobject<CAAnimation> animation(
[[overlay animationForKey:@"alphaValue"] copy]);
[animation setDelegate:self];
[animation setDuration:kFadeOutDurationSeconds];
NSMutableDictionary* dictionary =
[NSMutableDictionary dictionaryWithCapacity:1];
[dictionary setObject:animation forKey:@"alphaValue"];
[overlay setAnimations:dictionary];
[[overlay animator] setAlphaValue:0.0];
}
- (void)animationDidStop:(CAAnimation*)theAnimation finished:(BOOL)finished {
[self.view removeFromSuperview];
}
@end
|
