content/browser/theme_helper_mac.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 #include "content/browser/theme_helper_mac.h"
   6
   7 #import <Cocoa/Cocoa.h>
   8
   9 #include "base/command_line.h"
  10 #include "base/mac/sdk_forward_declarations.h"
  11 #include "content/common/view_messages.h"
  12 #include "content/public/browser/browser_thread.h"
  13 #include "content/public/browser/notification_service.h"
  14 #include "content/public/browser/notification_types.h"
  15 #include "content/public/browser/render_process_host.h"
  16 #include "content/public/common/content_switches.h"
  17
  18 // Declare notification names from the 10.7 SDK.
  19 #if !defined(MAC_OS_X_VERSION_10_7) || \
  20     MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_7
  21
  22 NSString* NSPreferredScrollerStyleDidChangeNotification =
  23     @"NSPreferredScrollerStyleDidChangeNotification";
  24
  25 #endif
  26
  27 @interface ScrollbarPrefsObserver : NSObject
  28
  29 + (void)registerAsObserver;
  30 + (void)appearancePrefsChanged:(NSNotification*)notification;
  31 + (void)behaviorPrefsChanged:(NSNotification*)notification;
  32 + (void)notifyPrefsChangedWithRedraw:(BOOL)redraw;
  33
  34 @end
  35
  36 @implementation ScrollbarPrefsObserver
  37
  38 + (void)registerAsObserver {
  39   [[NSDistributedNotificationCenter defaultCenter]
  40       addObserver:self
  41          selector:@selector(appearancePrefsChanged:)
  42              name:@"AppleAquaScrollBarVariantChanged"
  43            object:nil
  44 suspensionBehavior:NSNotificationSuspensionBehaviorDeliverImmediately];
  45
  46   [[NSDistributedNotificationCenter defaultCenter]
  47       addObserver:self
  48          selector:@selector(behaviorPrefsChanged:)
  49              name:@"AppleNoRedisplayAppearancePreferenceChanged"
  50            object:nil
  51 suspensionBehavior:NSNotificationSuspensionBehaviorCoalesce];
  52
  53   // In single-process mode, renderers will catch these notifications
  54   // themselves and listening for them here may trigger the DCHECK in Observe().
  55   if ([NSScroller respondsToSelector:@selector(preferredScrollerStyle)] &&
  56       !CommandLine::ForCurrentProcess()->HasSwitch(switches::kSingleProcess)) {
  57     [[NSNotificationCenter defaultCenter]
  58         addObserver:self
  59            selector:@selector(behaviorPrefsChanged:)
  60                name:NSPreferredScrollerStyleDidChangeNotification
  61              object:nil];
  62   }
  63 }
  64
  65 + (void)appearancePrefsChanged:(NSNotification*)notification {
  66   [self notifyPrefsChangedWithRedraw:YES];
  67 }
  68
  69 + (void)behaviorPrefsChanged:(NSNotification*)notification {
  70   [self notifyPrefsChangedWithRedraw:NO];
  71 }
  72
  73 + (void)notifyPrefsChangedWithRedraw:(BOOL)redraw {
  74   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
  75   NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
  76   [defaults synchronize];
  77
  78   content::ThemeHelperMac::SendThemeChangeToAllRenderers(
  79       [defaults floatForKey:@"NSScrollerButtonDelay"],
  80       [defaults floatForKey:@"NSScrollerButtonPeriod"],
  81       [defaults boolForKey:@"AppleScrollerPagingBehavior"],
  82       content::ThemeHelperMac::GetPreferredScrollerStyle(),
  83       redraw);
  84 }
  85
  86 @end
  87
  88 namespace content {
  89
  90 // static
  91 ThemeHelperMac* ThemeHelperMac::GetInstance() {
  92   return Singleton<ThemeHelperMac,
  93       LeakySingletonTraits<ThemeHelperMac> >::get();
  94 }
  95
  96 // static
  97 blink::ScrollerStyle ThemeHelperMac::GetPreferredScrollerStyle() {
  98   if (![NSScroller respondsToSelector:@selector(preferredScrollerStyle)])
  99     return blink::ScrollerStyleLegacy;
 100   return static_cast<blink::ScrollerStyle>([NSScroller preferredScrollerStyle]);
 101 }
 102
 103 // static
 104 void ThemeHelperMac::SendThemeChangeToAllRenderers(
 105     float initial_button_delay,
 106     float autoscroll_button_delay,
 107     bool jump_on_track_click,
 108     blink::ScrollerStyle preferred_scroller_style,
 109     bool redraw) {
 110   for (RenderProcessHost::iterator it(RenderProcessHost::AllHostsIterator());
 111        !it.IsAtEnd();
 112        it.Advance()) {
 113     it.GetCurrentValue()->Send(new ViewMsg_UpdateScrollbarTheme(
 114         initial_button_delay,
 115         autoscroll_button_delay,
 116         jump_on_track_click,
 117         preferred_scroller_style,
 118         redraw));
 119   }
 120 }
 121
 122 ThemeHelperMac::ThemeHelperMac() {
 123   [ScrollbarPrefsObserver registerAsObserver];
 124   registrar_.Add(this,
 125                  NOTIFICATION_RENDERER_PROCESS_CREATED,
 126                  NotificationService::AllSources());
 127 }
 128
 129 ThemeHelperMac::~ThemeHelperMac() {
 130 }
 131
 132 void ThemeHelperMac::Observe(int type,
 133                              const NotificationSource& source,
 134                              const NotificationDetails& details) {
 135   DCHECK_EQ(NOTIFICATION_RENDERER_PROCESS_CREATED, type);
 136
 137   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 138   NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
 139   [defaults synchronize];
 140
 141   RenderProcessHost* rph = Source<RenderProcessHost>(source).ptr();
 142   rph->Send(new ViewMsg_UpdateScrollbarTheme(
 143       [defaults floatForKey:@"NSScrollerButtonDelay"],
 144       [defaults floatForKey:@"NSScrollerButtonPeriod"],
 145       [defaults boolForKey:@"AppleScrollerPagingBehavior"],
 146       GetPreferredScrollerStyle(),
 147       false));
 148 }
 149
 150 }  // namespace content