src/chrome/browser/ui/cocoa/dock_icon.mm

   1 // Copyright (c) 2012 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 "chrome/browser/ui/cocoa/dock_icon.h"
   6
   7 #include "base/logging.h"
   8 #include "base/mac/bundle_locations.h"
   9 #include "base/mac/scoped_nsobject.h"
  10 #include "content/public/browser/browser_thread.h"
  11 #include "ui/gfx/scoped_ns_graphics_context_save_gstate_mac.h"
  12
  13 using content::BrowserThread;
  14
  15 namespace {
  16
  17 // The fraction of the size of the dock icon that the badge is.
  18 const float kBadgeFraction = 0.4f;
  19
  20 // The indentation of the badge.
  21 const float kBadgeIndent = 5.0f;
  22
  23 // The maximum update rate for the dock icon. 200ms = 5fps.
  24 const int64 kUpdateFrequencyMs = 200;
  25
  26 }  // namespace
  27
  28 // A view that draws our dock tile.
  29 @interface DockTileView : NSView {
  30  @private
  31   int downloads_;
  32   BOOL indeterminate_;
  33   float progress_;
  34 }
  35
  36 // Indicates how many downloads are in progress.
  37 @property (nonatomic) int downloads;
  38
  39 // Indicates whether the progress indicator should be in an indeterminate state
  40 // or not.
  41 @property (nonatomic) BOOL indeterminate;
  42
  43 // Indicates the amount of progress made of the download. Ranges from [0..1].
  44 @property (nonatomic) float progress;
  45
  46 @end
  47
  48 @implementation DockTileView
  49
  50 @synthesize downloads = downloads_;
  51 @synthesize indeterminate = indeterminate_;
  52 @synthesize progress = progress_;
  53
  54 - (void)drawRect:(NSRect)dirtyRect {
  55   // Not -[NSApplication applicationIconImage]; that fails to return a pasted
  56   // custom icon.
  57   NSString* appPath = [base::mac::MainBundle() bundlePath];
  58   NSImage* appIcon = [[NSWorkspace sharedWorkspace] iconForFile:appPath];
  59   [appIcon drawInRect:[self bounds]
  60              fromRect:NSZeroRect
  61             operation:NSCompositeSourceOver
  62              fraction:1.0];
  63
  64   if (downloads_ == 0)
  65     return;
  66
  67   NSRect badgeRect = [self bounds];
  68   badgeRect.size.height = (int)(kBadgeFraction * badgeRect.size.height);
  69   int newWidth = kBadgeFraction * NSWidth(badgeRect);
  70   badgeRect.origin.x = NSWidth(badgeRect) - newWidth;
  71   badgeRect.size.width = newWidth;
  72
  73   CGFloat badgeRadius = NSMidY(badgeRect);
  74
  75   badgeRect.origin.x -= kBadgeIndent;
  76   badgeRect.origin.y += kBadgeIndent;
  77
  78   NSPoint badgeCenter = NSMakePoint(NSMidX(badgeRect), NSMidY(badgeRect));
  79
  80   // Background
  81   NSColor* backgroundColor = [NSColor colorWithCalibratedRed:0.85
  82                                                        green:0.85
  83                                                         blue:0.85
  84                                                        alpha:1.0];
  85   NSColor* backgroundHighlight =
  86       [backgroundColor blendedColorWithFraction:0.85
  87                                         ofColor:[NSColor whiteColor]];
  88   base::scoped_nsobject<NSGradient> backgroundGradient(
  89       [[NSGradient alloc] initWithStartingColor:backgroundHighlight
  90                                     endingColor:backgroundColor]);
  91   NSBezierPath* badgeEdge = [NSBezierPath bezierPathWithOvalInRect:badgeRect];
  92   {
  93     gfx::ScopedNSGraphicsContextSaveGState scopedGState;
  94     [badgeEdge addClip];
  95     [backgroundGradient drawFromCenter:badgeCenter
  96                                 radius:0.0
  97                               toCenter:badgeCenter
  98                                 radius:badgeRadius
  99                                options:0];
 100   }
 101
 102   // Slice
 103   if (!indeterminate_) {
 104     NSColor* sliceColor = [NSColor colorWithCalibratedRed:0.45
 105                                                     green:0.8
 106                                                      blue:0.25
 107                                                     alpha:1.0];
 108     NSColor* sliceHighlight =
 109         [sliceColor blendedColorWithFraction:0.4
 110                                      ofColor:[NSColor whiteColor]];
 111     base::scoped_nsobject<NSGradient> sliceGradient(
 112         [[NSGradient alloc] initWithStartingColor:sliceHighlight
 113                                       endingColor:sliceColor]);
 114     NSBezierPath* progressSlice;
 115     if (progress_ >= 1.0) {
 116       progressSlice = [NSBezierPath bezierPathWithOvalInRect:badgeRect];
 117     } else {
 118       CGFloat endAngle = 90.0 - 360.0 * progress_;
 119       if (endAngle < 0.0)
 120         endAngle += 360.0;
 121       progressSlice = [NSBezierPath bezierPath];
 122       [progressSlice moveToPoint:badgeCenter];
 123       [progressSlice appendBezierPathWithArcWithCenter:badgeCenter
 124                                                 radius:badgeRadius
 125                                             startAngle:90.0
 126                                               endAngle:endAngle
 127                                              clockwise:YES];
 128       [progressSlice closePath];
 129     }
 130     gfx::ScopedNSGraphicsContextSaveGState scopedGState;
 131     [progressSlice addClip];
 132     [sliceGradient drawFromCenter:badgeCenter
 133                            radius:0.0
 134                          toCenter:badgeCenter
 135                            radius:badgeRadius
 136                           options:0];
 137   }
 138
 139   // Edge
 140   {
 141     gfx::ScopedNSGraphicsContextSaveGState scopedGState;
 142     [[NSColor whiteColor] set];
 143     base::scoped_nsobject<NSShadow> shadow([[NSShadow alloc] init]);
 144     [shadow.get() setShadowOffset:NSMakeSize(0, -2)];
 145     [shadow setShadowBlurRadius:2];
 146     [shadow set];
 147     [badgeEdge setLineWidth:2];
 148     [badgeEdge stroke];
 149   }
 150
 151   // Download count
 152   base::scoped_nsobject<NSNumberFormatter> formatter(
 153       [[NSNumberFormatter alloc] init]);
 154   NSString* countString =
 155       [formatter stringFromNumber:[NSNumber numberWithInt:downloads_]];
 156
 157   base::scoped_nsobject<NSShadow> countShadow([[NSShadow alloc] init]);
 158   [countShadow setShadowBlurRadius:3.0];
 159   [countShadow.get() setShadowColor:[NSColor whiteColor]];
 160   [countShadow.get() setShadowOffset:NSMakeSize(0.0, 0.0)];
 161   NSMutableDictionary* countAttrsDict =
 162       [NSMutableDictionary dictionaryWithObjectsAndKeys:
 163           [NSColor blackColor], NSForegroundColorAttributeName,
 164           countShadow.get(), NSShadowAttributeName,
 165           nil];
 166   CGFloat countFontSize = badgeRadius;
 167   NSSize countSize = NSZeroSize;
 168   base::scoped_nsobject<NSAttributedString> countAttrString;
 169   while (1) {
 170     NSFont* countFont = [NSFont fontWithName:@"Helvetica-Bold"
 171                                         size:countFontSize];
 172
 173     // This will generally be plain Helvetica.
 174     if (!countFont)
 175       countFont = [NSFont userFontOfSize:countFontSize];
 176
 177     // Continued failure would generate an NSException.
 178     if (!countFont)
 179       break;
 180
 181     [countAttrsDict setObject:countFont forKey:NSFontAttributeName];
 182     countAttrString.reset(
 183         [[NSAttributedString alloc] initWithString:countString
 184                                         attributes:countAttrsDict]);
 185     countSize = [countAttrString size];
 186     if (countSize.width > badgeRadius * 1.5) {
 187       countFontSize -= 1.0;
 188     } else {
 189       break;
 190     }
 191   }
 192
 193   NSPoint countOrigin = badgeCenter;
 194   countOrigin.x -= countSize.width / 2;
 195   countOrigin.y -= countSize.height / 2.2;  // tweak; otherwise too low
 196
 197   [countAttrString.get() drawAtPoint:countOrigin];
 198 }
 199
 200 @end
 201
 202
 203 @implementation DockIcon
 204
 205 + (DockIcon*)sharedDockIcon {
 206   static DockIcon* icon;
 207   if (!icon) {
 208     NSDockTile* dockTile = [[NSApplication sharedApplication] dockTile];
 209
 210     base::scoped_nsobject<DockTileView> dockTileView(
 211         [[DockTileView alloc] init]);
 212     [dockTile setContentView:dockTileView];
 213
 214     icon = [[DockIcon alloc] init];
 215   }
 216
 217   return icon;
 218 }
 219
 220 - (void)updateIcon {
 221   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 222   static base::TimeDelta updateFrequency =
 223       base::TimeDelta::FromMilliseconds(kUpdateFrequencyMs);
 224
 225   base::TimeTicks now = base::TimeTicks::Now();
 226   base::TimeDelta timeSinceLastUpdate = now - lastUpdate_;
 227   if (!forceUpdate_ && timeSinceLastUpdate < updateFrequency)
 228     return;
 229
 230   lastUpdate_ = now;
 231   forceUpdate_ = NO;
 232
 233   NSDockTile* dockTile = [[NSApplication sharedApplication] dockTile];
 234
 235   [dockTile display];
 236 }
 237
 238 - (void)setDownloads:(int)downloads {
 239   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 240   NSDockTile* dockTile = [[NSApplication sharedApplication] dockTile];
 241   DockTileView* dockTileView = (DockTileView*)([dockTile contentView]);
 242
 243   if (downloads != [dockTileView downloads]) {
 244     [dockTileView setDownloads:downloads];
 245     forceUpdate_ = YES;
 246   }
 247 }
 248
 249 - (void)setIndeterminate:(BOOL)indeterminate {
 250   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 251   NSDockTile* dockTile = [[NSApplication sharedApplication] dockTile];
 252   DockTileView* dockTileView = (DockTileView*)([dockTile contentView]);
 253
 254   if (indeterminate != [dockTileView indeterminate]) {
 255     [dockTileView setIndeterminate:indeterminate];
 256     forceUpdate_ = YES;
 257   }
 258 }
 259
 260 - (void)setProgress:(float)progress {
 261   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 262   NSDockTile* dockTile = [[NSApplication sharedApplication] dockTile];
 263   DockTileView* dockTileView = (DockTileView*)([dockTile contentView]);
 264
 265   [dockTileView setProgress:progress];
 266 }
 267
 268 @end