Adds MessageLoopUIApplication for use on iOS.

base/message_pump_mac.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // The basis for all native run loops on the Mac is the CFRunLoop.  It can be
 // used directly, it can be used as the driving force behind the similar
 // Foundation NSRunLoop, and it can be used to implement higher-level event
 // loops such as the NSApplication event loop.
 //
 // This file introduces a basic CFRunLoop-based implementation of the
@@ skipping 20 matching lines @@
 #define BASE_MESSAGE_PUMP_MAC_H_
 #pragma once
 
 #include "base/message_pump.h"
 
 #include <CoreFoundation/CoreFoundation.h>
 
 #if !defined(__OBJC__)
 class NSAutoreleasePool;
 #else  // !defined(__OBJC__)
+#if defined(OS_IOS)
+#import <Foundation/Foundation.h>
+#else
 #import <AppKit/AppKit.h>
 
 // Clients must subclass NSApplication and implement this protocol if they use
 // MessagePumpMac.
 @protocol CrAppProtocol
 // Must return true if -[NSApplication sendEvent:] is currently on the stack.
 // See the comment for |CreateAutoreleasePool()| in the cc file for why this is
 // necessary.
 - (BOOL)isHandlingSendEvent;
 @end
+#endif  // !defined(OS_IOS)
 #endif  // !defined(__OBJC__)
 
 namespace base {
 
+class RunLoop;
 class TimeTicks;
 
 class MessagePumpCFRunLoopBase : public MessagePump {
   // Needs access to CreateAutoreleasePool.
   friend class MessagePumpScopedAutoreleasePool;
  public:
   MessagePumpCFRunLoopBase();
 
   // Subclasses should implement the work they need to do in MessagePump::Run
   // in the DoRun method.  MessagePumpCFRunLoopBase::Run calls DoRun directly.
   // This arrangement is used because MessagePumpCFRunLoopBase needs to set
   // up and tear down things before and after the "meat" of DoRun.
   virtual void Run(Delegate* delegate) OVERRIDE;
   virtual void DoRun(Delegate* delegate) = 0;
 
   virtual void ScheduleWork() OVERRIDE;
   virtual void ScheduleDelayedWork(const TimeTicks& delayed_work_time) OVERRIDE;
 
  protected:
   virtual ~MessagePumpCFRunLoopBase();
 
   // Accessors for private data members to be used by subclasses.
   CFRunLoopRef run_loop() const { return run_loop_; }
   int nesting_level() const { return nesting_level_; }
   int run_nesting_level() const { return run_nesting_level_; }
 
+  // Sets this pump's delegate.  Signals the appropriate sources if
+  // |delegateless_work_| is true.  |delegate| can be NULL.
+  void SetDelegate(Delegate* delegate);
+
   // Return an autorelease pool to wrap around any work being performed.
   // In some cases, CreateAutoreleasePool may return nil intentionally to
   // preventing an autorelease pool from being created, allowing any
   // objects autoreleased by work to fall into the current autorelease pool.
   virtual NSAutoreleasePool* CreateAutoreleasePool();
 
  private:
   // Timer callback scheduled by ScheduleDelayedWork.  This does not do any
   // work, but it signals work_source_ so that delayed work can be performed
   // within the appropriate priority constraints.
@@ skipping 133 matching lines @@
   // attached to the run loop.  This source will be signalled when Quit
   // is called, to cause the loop to wake up so that it can stop.
   CFRunLoopSourceRef quit_source_;
 
   // False after Quit is called.
   bool keep_running_;
 
   DISALLOW_COPY_AND_ASSIGN(MessagePumpNSRunLoop);
 };
 
+#if defined(OS_IOS)
+// This is a fake message pump.  It attaches sources to the main thread's
+// CFRunLoop, so PostTask() will work, but it is unable to drive the loop
+// directly, so calling Run() or Quit() are errors.
+class MessagePumpUIApplication : public MessagePumpCFRunLoopBase {
+ public:
+  MessagePumpUIApplication() { }
+  virtual void DoRun(Delegate* delegate) OVERRIDE;
+  virtual void Quit() OVERRIDE;
+
+  // This message pump can not spin the main message loop directly.  Instead,
+  // call |Attach()| to set up a delegate.  It is an error to call |Run()|.
+  virtual void Attach(Delegate* delegate);
+
+ protected:
+  virtual ~MessagePumpUIApplication();
+
+ private:
+  base::RunLoop* run_loop_;
+
+  DISALLOW_COPY_AND_ASSIGN(MessagePumpUIApplication);
+};
+
+#else
+
 class MessagePumpNSApplication : public MessagePumpCFRunLoopBase {
  public:
   MessagePumpNSApplication();
 
   virtual void DoRun(Delegate* delegate) OVERRIDE;
   virtual void Quit() OVERRIDE;
 
  protected:
   virtual ~MessagePumpNSApplication();
 
@@ skipping 17 matching lines @@
  protected:
   virtual ~MessagePumpCrApplication() {}
 
   // Returns nil if NSApp is currently in the middle of calling
   // -sendEvent.  Requires NSApp implementing CrAppProtocol.
   virtual NSAutoreleasePool* CreateAutoreleasePool() OVERRIDE;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MessagePumpCrApplication);
 };
+#endif  // !defined(OS_IOS)
 
 class MessagePumpMac {
  public:
   // If not on the main thread, returns a new instance of
   // MessagePumpNSRunLoop.
   //
   // On the main thread, if NSApp exists and conforms to
   // CrAppProtocol, creates an instances of MessagePumpCrApplication.
   //
   // Otherwise creates an instance of MessagePumpNSApplication using a
   // default NSApplication.
   static MessagePump* Create();
 
+#if !defined(OS_IOS)
   // If a pump is created before the required CrAppProtocol is
   // created, the wrong MessagePump subclass could be used.
   // UsingCrApp() returns false if the message pump was created before
   // NSApp was initialized, or if NSApp does not implement
   // CrAppProtocol.  NSApp must be initialized before calling.
   BASE_EXPORT static bool UsingCrApp();
 
   // Wrapper to query -[NSApp isHandlingSendEvent] from C++ code.
   // Requires NSApp to implement CrAppProtocol.
   BASE_EXPORT static bool IsHandlingSendEvent();
+#endif  // !defined(OS_IOS)
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(MessagePumpMac);
 };
 
 }  // namespace base
 
 #endif  // BASE_MESSAGE_PUMP_MAC_H_