ui/app_list/cocoa/app_list_pager_view.mm

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #import "ui/app_list/cocoa/app_list_pager_view.h"
   6
   7 #include "base/mac/foundation_util.h"
   8 #include "skia/ext/skia_utils_mac.h"
   9 #include "ui/app_list/app_list_constants.h"
  10 #include "ui/gfx/scoped_ns_graphics_context_save_gstate_mac.h"
  11
  12 namespace {
  13
  14 const CGFloat kButtonHeight = 6;
  15 const CGFloat kButtonCornerRadius = 2;
  16 const CGFloat kButtonStripPadding = 20;
  17
  18 }  // namespace
  19
  20 @interface AppListPagerView ()
  21
  22 @property(assign, nonatomic) NSInteger hoveredSegment;
  23
  24 - (NSInteger)segmentUnderLocation:(NSPoint)locationInWindow;
  25
  26 @end
  27
  28 @interface AppListPagerCell : NSSegmentedCell;
  29 @end
  30
  31 @implementation AppListPagerView
  32
  33 @synthesize hoveredSegment = hoveredSegment_;
  34
  35 + (Class)cellClass {
  36   return [AppListPagerCell class];
  37 }
  38
  39 - (id)init {
  40   if ((self = [super initWithFrame:NSZeroRect])) {
  41     trackingArea_.reset(
  42         [[CrTrackingArea alloc] initWithRect:NSZeroRect
  43                                      options:NSTrackingInVisibleRect |
  44                                              NSTrackingMouseEnteredAndExited |
  45                                              NSTrackingMouseMoved |
  46                                              NSTrackingActiveInKeyWindow
  47                                        owner:self
  48                                     userInfo:nil]);
  49     [self addTrackingArea:trackingArea_.get()];
  50     hoveredSegment_ = -1;
  51   }
  52   return self;
  53 }
  54
  55 - (NSInteger)findAndHighlightSegmentAtLocation:(NSPoint)locationInWindow {
  56   NSInteger segment = [self segmentUnderLocation:locationInWindow];
  57   [self setHoveredSegment:segment];
  58   return segment;
  59 }
  60
  61 - (void)setHoveredSegment:(NSInteger)segment {
  62   if (segment == hoveredSegment_)
  63     return;
  64
  65   hoveredSegment_ = segment;
  66   [self setNeedsDisplay:YES];
  67   return;
  68 }
  69
  70 - (NSInteger)segmentUnderLocation:(NSPoint)locationInWindow {
  71   if ([self segmentCount] == 0)
  72     return -1;
  73
  74   NSPoint pointInView = [self convertPoint:locationInWindow
  75                                   fromView:nil];
  76   if (![self mouse:pointInView inRect:[self bounds]])
  77     return -1;
  78
  79   CGFloat segmentWidth = [self bounds].size.width / [self segmentCount];
  80   return pointInView.x / segmentWidth;
  81 }
  82
  83 - (BOOL)isHoveredForSegment:(NSInteger)segment {
  84   return segment == hoveredSegment_;
  85 }
  86
  87 - (void)mouseExited:(NSEvent*)theEvent {
  88   [self setHoveredSegment:-1];
  89 }
  90
  91 - (void)mouseMoved:(NSEvent*)theEvent {
  92   [self findAndHighlightSegmentAtLocation:[theEvent locationInWindow]];
  93 }
  94
  95 - (void)mouseDown:(NSEvent*)theEvent {
  96   // Temporarily clear the highlight to give feedback.
  97   [self setHoveredSegment:-1];
  98 }
  99
 100 // The stock NSSegmentedControl ignores any clicks outside the non-default
 101 // control height, so process all clicks here.
 102 - (void)mouseUp:(NSEvent*)theEvent {
 103   [self findAndHighlightSegmentAtLocation:[theEvent locationInWindow]];
 104   if (hoveredSegment_ < 0)
 105     return;
 106
 107   [self setSelectedSegment:hoveredSegment_];
 108   [[self target] performSelector:[self action]
 109                       withObject:self];
 110 }
 111
 112 @end
 113
 114 @implementation AppListPagerCell
 115
 116 - (void)drawWithFrame:(NSRect)cellFrame
 117                inView:(NSView*)controlView {
 118   // Draw nothing if there are less than two segments.
 119   if ([self segmentCount] < 2)
 120     return;
 121
 122   cellFrame.size.width /= [self segmentCount];
 123   for (NSInteger i = 0; i < [self segmentCount]; ++i) {
 124     [self drawSegment:i
 125               inFrame:cellFrame
 126              withView:controlView];
 127     cellFrame.origin.x += cellFrame.size.width;
 128   }
 129 }
 130
 131 - (void)drawSegment:(NSInteger)segment
 132             inFrame:(NSRect)frame
 133            withView:(NSView*)controlView {
 134   gfx::ScopedNSGraphicsContextSaveGState context;
 135   NSRect clipRect = NSMakeRect(
 136       frame.origin.x + kButtonStripPadding / 2,
 137       floor(frame.origin.y + (frame.size.height - kButtonHeight) / 2),
 138       frame.size.width - kButtonStripPadding,
 139       kButtonHeight);
 140   [[NSBezierPath bezierPathWithRoundedRect:clipRect
 141                                    xRadius:kButtonCornerRadius
 142                                    yRadius:kButtonCornerRadius] addClip];
 143
 144   AppListPagerView* pagerControl =
 145       base::mac::ObjCCastStrict<AppListPagerView>(controlView);
 146   SkColor backgroundColor = [pagerControl hoveredSegment] == segment ?
 147       app_list::kPagerHoverColor :
 148       app_list::kPagerNormalColor;
 149
 150   [gfx::SkColorToSRGBNSColor(backgroundColor) set];
 151   NSRectFill(frame);
 152
 153   if (![[self target] conformsToProtocol:@protocol(AppListPagerDelegate)])
 154     return;
 155
 156   CGFloat selectedRatio = [[self target] visiblePortionOfPage:segment];
 157   if (selectedRatio == 0.0)
 158     return;
 159
 160   [gfx::SkColorToSRGBNSColor(app_list::kPagerSelectedColor) set];
 161   if (selectedRatio < 0)
 162     frame.origin.x += frame.size.width + frame.size.width * selectedRatio;
 163   frame.size.width *= fabs(selectedRatio);
 164   NSRectFill(frame);
 165 }
 166
 167 @end