src/content/plugin/plugin_interpose_util_mac.mm

   1 // Copyright (c) 2011 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/plugin/plugin_interpose_util_mac.h"
   6
   7 #import <AppKit/AppKit.h>
   8 #import <objc/runtime.h>
   9
  10 #include "content/child/npapi/webplugin_delegate_impl.h"
  11 #include "content/common/plugin_process_messages.h"
  12 #include "content/plugin/plugin_thread.h"
  13
  14 using content::PluginThread;
  15
  16 namespace mac_plugin_interposing {
  17
  18 // TODO(stuartmorgan): Make this an IPC to order the plugin process above the
  19 // browser process only if the browser is current frontmost.
  20 __attribute__((visibility("default")))
  21 void SwitchToPluginProcess() {
  22   ProcessSerialNumber this_process, front_process;
  23   if ((GetCurrentProcess(&this_process) != noErr) ||
  24       (GetFrontProcess(&front_process) != noErr)) {
  25     return;
  26   }
  27
  28   Boolean matched = false;
  29   if ((SameProcess(&this_process, &front_process, &matched) == noErr) &&
  30       !matched) {
  31     SetFrontProcess(&this_process);
  32   }
  33 }
  34
  35 __attribute__((visibility("default")))
  36 OpaquePluginRef GetActiveDelegate() {
  37   return content::WebPluginDelegateImpl::GetActiveDelegate();
  38 }
  39
  40 __attribute__((visibility("default")))
  41 void NotifyBrowserOfPluginSelectWindow(uint32 window_id, CGRect bounds,
  42                                        bool modal) {
  43   PluginThread* plugin_thread = PluginThread::current();
  44   if (plugin_thread) {
  45     gfx::Rect window_bounds(bounds);
  46     plugin_thread->Send(
  47         new PluginProcessHostMsg_PluginSelectWindow(window_id, window_bounds,
  48                                                     modal));
  49   }
  50 }
  51
  52 __attribute__((visibility("default")))
  53 void NotifyBrowserOfPluginShowWindow(uint32 window_id, CGRect bounds,
  54                                      bool modal) {
  55   PluginThread* plugin_thread = PluginThread::current();
  56   if (plugin_thread) {
  57     gfx::Rect window_bounds(bounds);
  58     plugin_thread->Send(
  59         new PluginProcessHostMsg_PluginShowWindow(window_id, window_bounds,
  60                                                   modal));
  61   }
  62 }
  63
  64 __attribute__((visibility("default")))
  65 void NotifyBrowserOfPluginHideWindow(uint32 window_id, CGRect bounds) {
  66   PluginThread* plugin_thread = PluginThread::current();
  67   if (plugin_thread) {
  68     gfx::Rect window_bounds(bounds);
  69     plugin_thread->Send(
  70         new PluginProcessHostMsg_PluginHideWindow(window_id, window_bounds));
  71   }
  72 }
  73
  74 void NotifyPluginOfSetCursorVisibility(bool visibility) {
  75   PluginThread* plugin_thread = PluginThread::current();
  76   if (plugin_thread) {
  77     plugin_thread->Send(
  78         new PluginProcessHostMsg_PluginSetCursorVisibility(visibility));
  79   }
  80 }
  81
  82 }  // namespace mac_plugin_interposing
  83
  84 #pragma mark -
  85
  86 struct WindowInfo {
  87   uint32 window_id;
  88   CGRect bounds;
  89   WindowInfo(NSWindow* window) {
  90     NSInteger window_num = [window windowNumber];
  91     window_id = window_num > 0 ? window_num : 0;
  92     bounds = NSRectToCGRect([window frame]);
  93   }
  94 };
  95
  96 static void OnPluginWindowClosed(const WindowInfo& window_info) {
  97   if (window_info.window_id == 0)
  98     return;
  99   mac_plugin_interposing::NotifyBrowserOfPluginHideWindow(window_info.window_id,
 100                                                           window_info.bounds);
 101 }
 102
 103 static BOOL g_waiting_for_window_number = NO;
 104
 105 static void OnPluginWindowShown(const WindowInfo& window_info, BOOL is_modal) {
 106   // The window id is 0 if it has never been shown (including while it is the
 107   // process of being shown for the first time); when that happens, we'll catch
 108   // it in _setWindowNumber instead.
 109   static BOOL s_pending_display_is_modal = NO;
 110   if (window_info.window_id == 0) {
 111     g_waiting_for_window_number = YES;
 112     if (is_modal)
 113       s_pending_display_is_modal = YES;
 114     return;
 115   }
 116   g_waiting_for_window_number = NO;
 117   if (s_pending_display_is_modal) {
 118     is_modal = YES;
 119     s_pending_display_is_modal = NO;
 120   }
 121   mac_plugin_interposing::NotifyBrowserOfPluginShowWindow(
 122     window_info.window_id, window_info.bounds, is_modal);
 123 }
 124
 125 @interface NSWindow (ChromePluginUtilities)
 126 // Returns YES if the window is visible and actually on the screen.
 127 - (BOOL)chromePlugin_isWindowOnScreen;
 128 @end
 129
 130 @implementation NSWindow (ChromePluginUtilities)
 131
 132 - (BOOL)chromePlugin_isWindowOnScreen {
 133   if (![self isVisible])
 134     return NO;
 135   NSRect window_frame = [self frame];
 136   for (NSScreen* screen in [NSScreen screens]) {
 137     if (NSIntersectsRect(window_frame, [screen frame]))
 138       return YES;
 139   }
 140   return NO;
 141 }
 142
 143 @end
 144
 145 @interface NSWindow (ChromePluginInterposing)
 146 - (void)chromePlugin_orderOut:(id)sender;
 147 - (void)chromePlugin_orderFront:(id)sender;
 148 - (void)chromePlugin_makeKeyAndOrderFront:(id)sender;
 149 - (void)chromePlugin_setWindowNumber:(NSInteger)num;
 150 @end
 151
 152 @implementation NSWindow (ChromePluginInterposing)
 153
 154 - (void)chromePlugin_orderOut:(id)sender {
 155   WindowInfo window_info(self);
 156   [self chromePlugin_orderOut:sender];
 157   OnPluginWindowClosed(window_info);
 158 }
 159
 160 - (void)chromePlugin_orderFront:(id)sender {
 161   [self chromePlugin_orderFront:sender];
 162   if ([self chromePlugin_isWindowOnScreen])
 163     mac_plugin_interposing::SwitchToPluginProcess();
 164   OnPluginWindowShown(WindowInfo(self), NO);
 165 }
 166
 167 - (void)chromePlugin_makeKeyAndOrderFront:(id)sender {
 168   [self chromePlugin_makeKeyAndOrderFront:sender];
 169   if ([self chromePlugin_isWindowOnScreen])
 170     mac_plugin_interposing::SwitchToPluginProcess();
 171   OnPluginWindowShown(WindowInfo(self), NO);
 172 }
 173
 174 - (void)chromePlugin_setWindowNumber:(NSInteger)num {
 175   if (!g_waiting_for_window_number || num <= 0) {
 176     [self chromePlugin_setWindowNumber:num];
 177     return;
 178   }
 179   mac_plugin_interposing::SwitchToPluginProcess();
 180   [self chromePlugin_setWindowNumber:num];
 181   OnPluginWindowShown(WindowInfo(self), NO);
 182 }
 183
 184 @end
 185
 186 @interface NSApplication (ChromePluginInterposing)
 187 - (NSInteger)chromePlugin_runModalForWindow:(NSWindow*)window;
 188 @end
 189
 190 @implementation NSApplication (ChromePluginInterposing)
 191
 192 - (NSInteger)chromePlugin_runModalForWindow:(NSWindow*)window {
 193   mac_plugin_interposing::SwitchToPluginProcess();
 194   // This is out-of-order relative to the other calls, but runModalForWindow:
 195   // won't return until the window closes, and the order only matters for
 196   // full-screen windows.
 197   OnPluginWindowShown(WindowInfo(window), YES);
 198   return [self chromePlugin_runModalForWindow:window];
 199 }
 200
 201 @end
 202
 203 @interface NSCursor (ChromePluginInterposing)
 204 - (void)chromePlugin_set;
 205 + (void)chromePlugin_hide;
 206 + (void)chromePlugin_unhide;
 207 @end
 208
 209 @implementation NSCursor (ChromePluginInterposing)
 210
 211 - (void)chromePlugin_set {
 212   OpaquePluginRef delegate = mac_plugin_interposing::GetActiveDelegate();
 213   if (delegate) {
 214     static_cast<content::WebPluginDelegateImpl*>(delegate)->SetNSCursor(self);
 215     return;
 216   }
 217   [self chromePlugin_set];
 218 }
 219
 220 + (void)chromePlugin_hide {
 221   mac_plugin_interposing::NotifyPluginOfSetCursorVisibility(false);
 222 }
 223
 224 + (void)chromePlugin_unhide {
 225   mac_plugin_interposing::NotifyPluginOfSetCursorVisibility(true);
 226 }
 227
 228 @end
 229
 230 #pragma mark -
 231
 232 static void ExchangeMethods(Class target_class,
 233                             BOOL class_method,
 234                             SEL original,
 235                             SEL replacement) {
 236   Method m1;
 237   Method m2;
 238   if (class_method) {
 239     m1 = class_getClassMethod(target_class, original);
 240     m2 = class_getClassMethod(target_class, replacement);
 241   } else {
 242     m1 = class_getInstanceMethod(target_class, original);
 243     m2 = class_getInstanceMethod(target_class, replacement);
 244   }
 245   if (m1 && m2)
 246     method_exchangeImplementations(m1, m2);
 247   else
 248     NOTREACHED() << "Cocoa swizzling failed";
 249 }
 250
 251 namespace mac_plugin_interposing {
 252
 253 void SetUpCocoaInterposing() {
 254   Class nswindow_class = [NSWindow class];
 255   ExchangeMethods(nswindow_class, NO, @selector(orderOut:),
 256                   @selector(chromePlugin_orderOut:));
 257   ExchangeMethods(nswindow_class, NO, @selector(orderFront:),
 258                   @selector(chromePlugin_orderFront:));
 259   ExchangeMethods(nswindow_class, NO, @selector(makeKeyAndOrderFront:),
 260                   @selector(chromePlugin_makeKeyAndOrderFront:));
 261   ExchangeMethods(nswindow_class, NO, @selector(_setWindowNumber:),
 262                   @selector(chromePlugin_setWindowNumber:));
 263
 264   ExchangeMethods([NSApplication class], NO, @selector(runModalForWindow:),
 265                   @selector(chromePlugin_runModalForWindow:));
 266
 267   Class nscursor_class = [NSCursor class];
 268   ExchangeMethods(nscursor_class, NO, @selector(set),
 269                   @selector(chromePlugin_set));
 270   ExchangeMethods(nscursor_class, YES, @selector(hide),
 271                   @selector(chromePlugin_hide));
 272   ExchangeMethods(nscursor_class, YES, @selector(unhide),
 273                   @selector(chromePlugin_unhide));
 274 }
 275
 276 }  // namespace mac_plugin_interposing