summaryrefslogtreecommitdiff
path: root/frontends/cocoa/BlackScroller.m
blob: 2ee739f3a6d2060ee26e3859cabde8102944cd70 (plain)
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) 1011 Sven Weidauer
 *
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use, copy,
 * modify, merge, publish, distribute, sublicense, and/or sell copies
 * of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#import "BlackScroller.h"

@implementation BlackScroller

- (void) setFrame: (NSRect)frameRect
{
        [super setFrame: frameRect];
        if (tag != 0) [self removeTrackingRect: tag];
        tag = [self addTrackingRect: [self bounds] owner: self userData: NULL assumeInside: NO];
}

- (void) drawRect: (NSRect)dirtyRect
{
        [[NSColor clearColor] set];
        [NSBezierPath fillRect: dirtyRect];

        if (drawTrack) [self drawKnobSlotInRect: [self rectForPart: NSScrollerKnobSlot]
                                      highlight: NO];
        [self drawKnob];
}

- (void) drawKnobSlotInRect: (NSRect)slotRect highlight: (BOOL)flag
{
        slotRect = NSInsetRect( slotRect, 2, 2 );
        slotRect = [self convertRectToBase: slotRect];
        slotRect.origin.x = floor( slotRect.origin.x ) + 0.5;
        slotRect.origin.y = floor( slotRect.origin.y ) + 0.5;
        slotRect.size.width = floor( slotRect.size.width );
        slotRect.size.height = floor( slotRect.size.height );
        slotRect = [self convertRectFromBase: slotRect];

        NSGradient *gradient = [[[NSGradient alloc] initWithColorsAndLocations:
                                                            [NSColor clearColor], 0.0,
                                                    [NSColor clearColor], 0.4,
                                                    [NSColor whiteColor], 1.0,
                                                    nil] autorelease];
        [[NSColor whiteColor] set];
        const float radius = 0.5 * ([self isHorizontal] ? NSHeight( slotRect ) : NSWidth( slotRect ));
        NSBezierPath *path = [NSBezierPath bezierPathWithRoundedRect: slotRect
                                                             xRadius: radius
                                                             yRadius: radius];
        [gradient drawInBezierPath: path angle: [self isHorizontal] ? 90 : 0];

        [path stroke];
}


- (NSUsableScrollerParts) usableParts
{
        return NSScrollerKnob | NSScrollerKnobSlot;
}

- (void) drawKnob
{
        NSRect rect = NSInsetRect( [self rectForPart: NSScrollerKnob], 2, 2 );

        rect = [self convertRectToBase: rect];
        rect.origin.x = floor( rect.origin.x ) + 0.5;
        rect.origin.y = floor( rect.origin.y ) + 0.5;
        rect.size.width = floor( rect.size.width );
        rect.size.height = floor( rect.size.height );
        rect = [self convertRectFromBase: rect];

        [[NSColor colorWithDeviceWhite: 1.0 alpha: drawTrack ? 1.0 : 0.6] set];

        const float radius = 0.5 * ([self isHorizontal] ? NSHeight( rect ) : NSWidth( rect ));
        NSBezierPath *path = [NSBezierPath bezierPathWithRoundedRect: rect
                                                             xRadius: radius
                                                             yRadius: radius];
        [path fill];
        [path stroke];
}

- (NSRect) rectForPart: (NSScrollerPart)partCode
{
        const bool horizontal = [self isHorizontal];

        NSRect rect = horizontal ? NSInsetRect( [self bounds], 4, 0 ) : NSInsetRect( [self bounds], 0, 4 );

        switch (partCode) {
        case NSScrollerKnobSlot:
                return rect;

        case NSScrollerKnob: {
                const CGFloat len = horizontal ? NSWidth( rect ) : NSHeight( rect );
                CGFloat knobLen = [self knobProportion] * len;
                const CGFloat minKnobLen = horizontal ? NSHeight( rect ) : NSWidth( rect );
                if (knobLen < minKnobLen) knobLen = minKnobLen;

                const CGFloat start = [self doubleValue] * (len - knobLen);

                if (horizontal) {
                        rect.origin.x += start;
                        rect.size.width = knobLen;
                } else {
                        rect.origin.y += start;
                        rect.size.height = knobLen;
                }

                return rect;
        }

        default:
                return [super rectForPart: partCode];
        }
}

- (BOOL) isOpaque
{
        return NO;
}

- (BOOL) isHorizontal
{
        NSRect bounds = [self bounds];
        return NSWidth( bounds ) > NSHeight( bounds );
}

- (void) mouseEntered: (NSEvent *)theEvent
{
        drawTrack = YES;
        [self setNeedsDisplay: YES];
}

- (void) mouseExited: (NSEvent *)theEvent
{
        drawTrack = NO;
        [self setNeedsDisplay: YES];
}

@end