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 "ui/events/event_source.h" 6 7 #include <algorithm> 8 9 #include "ui/events/event_processor.h" 10 #include "ui/events/event_rewriter.h" 11 12 namespace ui { 13 14 EventSource::EventSource() {} 15 16 EventSource::~EventSource() {} 17 18 void EventSource::AddEventRewriter(EventRewriter* rewriter) { 19 DCHECK(rewriter); 20 DCHECK(rewriter_list_.end() == 21 std::find(rewriter_list_.begin(), rewriter_list_.end(), rewriter)); 22 rewriter_list_.push_back(rewriter); 23 } 24 25 void EventSource::RemoveEventRewriter(EventRewriter* rewriter) { 26 EventRewriterList::iterator find = 27 std::find(rewriter_list_.begin(), rewriter_list_.end(), rewriter); 28 if (find != rewriter_list_.end()) 29 rewriter_list_.erase(find); 30 } 31 32 EventDispatchDetails EventSource::SendEventToProcessor(Event* event) { 33 scoped_ptr<Event> rewritten_event; 34 EventRewriteStatus status = EVENT_REWRITE_CONTINUE; 35 EventRewriterList::const_iterator it = rewriter_list_.begin(), 36 end = rewriter_list_.end(); 37 for (; it != end; ++it) { 38 status = (*it)->RewriteEvent(*event, &rewritten_event); 39 if (status == EVENT_REWRITE_DISCARD) { 40 CHECK(!rewritten_event); 41 return EventDispatchDetails(); 42 } 43 if (status == EVENT_REWRITE_CONTINUE) { 44 CHECK(!rewritten_event); 45 continue; 46 } 47 break; 48 } 49 CHECK((it == end && !rewritten_event) || rewritten_event); 50 EventDispatchDetails details = 51 DeliverEventToProcessor(rewritten_event ? rewritten_event.get() : event); 52 if (details.dispatcher_destroyed) 53 return details; 54 55 while (status == EVENT_REWRITE_DISPATCH_ANOTHER) { 56 scoped_ptr<Event> new_event; 57 status = (*it)->NextDispatchEvent(*rewritten_event, &new_event); 58 if (status == EVENT_REWRITE_DISCARD) 59 return EventDispatchDetails(); 60 CHECK_NE(EVENT_REWRITE_CONTINUE, status); 61 CHECK(new_event); 62 details = DeliverEventToProcessor(new_event.get()); 63 if (details.dispatcher_destroyed) 64 return details; 65 rewritten_event.reset(new_event.release()); 66 } 67 return EventDispatchDetails(); 68 } 69 70 EventDispatchDetails EventSource::DeliverEventToProcessor(Event* event) { 71 EventProcessor* processor = GetEventProcessor(); 72 CHECK(processor); 73 return processor->OnEventFromSource(event); 74 } 75 76 } // namespace ui 77
