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      1 // Copyright 2014 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/wm/core/nested_accelerator_dispatcher.h"
      6 
      7 #include "base/memory/scoped_ptr.h"
      8 #include "base/run_loop.h"
      9 #include "ui/base/accelerators/accelerator.h"
     10 #include "ui/events/event.h"
     11 #include "ui/events/platform/platform_event_dispatcher.h"
     12 #include "ui/events/platform/platform_event_source.h"
     13 #include "ui/events/platform/scoped_event_dispatcher.h"
     14 #include "ui/wm/core/accelerator_filter.h"
     15 #include "ui/wm/core/nested_accelerator_delegate.h"
     16 
     17 #if defined(USE_X11)
     18 #include <X11/Xlib.h>
     19 #endif
     20 
     21 namespace wm {
     22 
     23 namespace {
     24 
     25 #if defined(USE_OZONE)
     26 bool IsKeyEvent(const base::NativeEvent& native_event) {
     27   const ui::KeyEvent* event = static_cast<const ui::KeyEvent*>(native_event);
     28   return event->IsKeyEvent();
     29 }
     30 #elif defined(USE_X11)
     31 bool IsKeyEvent(const XEvent* xev) {
     32   return xev->type == KeyPress || xev->type == KeyRelease;
     33 }
     34 #else
     35 #error Unknown build platform: you should have either use_ozone or use_x11.
     36 #endif
     37 
     38 scoped_ptr<ui::ScopedEventDispatcher> OverrideDispatcher(
     39     ui::PlatformEventDispatcher* dispatcher) {
     40   ui::PlatformEventSource* source = ui::PlatformEventSource::GetInstance();
     41   return source ? source->OverrideDispatcher(dispatcher)
     42                 : scoped_ptr<ui::ScopedEventDispatcher>();
     43 }
     44 
     45 }  // namespace
     46 
     47 class NestedAcceleratorDispatcherLinux : public NestedAcceleratorDispatcher,
     48                                          public ui::PlatformEventDispatcher {
     49  public:
     50   explicit NestedAcceleratorDispatcherLinux(NestedAcceleratorDelegate* delegate)
     51       : NestedAcceleratorDispatcher(delegate),
     52         restore_dispatcher_(OverrideDispatcher(this)) {}
     53 
     54   virtual ~NestedAcceleratorDispatcherLinux() {}
     55 
     56  private:
     57   // AcceleratorDispatcher:
     58   virtual scoped_ptr<base::RunLoop> CreateRunLoop() OVERRIDE {
     59     return scoped_ptr<base::RunLoop>(new base::RunLoop());
     60   }
     61 
     62   // ui::PlatformEventDispatcher:
     63   virtual bool CanDispatchEvent(const ui::PlatformEvent& event) OVERRIDE {
     64     return true;
     65   }
     66 
     67   virtual uint32_t DispatchEvent(const ui::PlatformEvent& event) OVERRIDE {
     68     if (IsKeyEvent(event)) {
     69       ui::KeyEvent key_event(event, false);
     70       ui::Accelerator accelerator = CreateAcceleratorFromKeyEvent(key_event);
     71 
     72       switch (delegate_->ProcessAccelerator(accelerator)) {
     73         case NestedAcceleratorDelegate::RESULT_PROCESS_LATER:
     74 #if defined(USE_X11)
     75           XPutBackEvent(event->xany.display, event);
     76 #else
     77           NOTIMPLEMENTED();
     78 #endif
     79           return ui::POST_DISPATCH_NONE;
     80         case NestedAcceleratorDelegate::RESULT_PROCESSED:
     81           return ui::POST_DISPATCH_NONE;
     82         case NestedAcceleratorDelegate::RESULT_NOT_PROCESSED:
     83           break;
     84       }
     85     }
     86     ui::PlatformEventDispatcher* prev = *restore_dispatcher_;
     87 
     88     return prev ? prev->DispatchEvent(event)
     89                 : ui::POST_DISPATCH_PERFORM_DEFAULT;
     90   }
     91 
     92   scoped_ptr<ui::ScopedEventDispatcher> restore_dispatcher_;
     93 
     94   DISALLOW_COPY_AND_ASSIGN(NestedAcceleratorDispatcherLinux);
     95 };
     96 
     97 scoped_ptr<NestedAcceleratorDispatcher> NestedAcceleratorDispatcher::Create(
     98     NestedAcceleratorDelegate* delegate,
     99     base::MessagePumpDispatcher* nested_dispatcher) {
    100   return scoped_ptr<NestedAcceleratorDispatcher>(
    101       new NestedAcceleratorDispatcherLinux(delegate));
    102 }
    103 
    104 }  // namespace wm
    105