ui/wm/core/nested_accelerator_dispatcher_linux.cc

   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   ~NestedAcceleratorDispatcherLinux() override {}
  55
  56  private:
  57   // AcceleratorDispatcher:
  58   scoped_ptr<base::RunLoop> CreateRunLoop() override {
  59     return make_scoped_ptr(new base::RunLoop());
  60   }
  61
  62   // ui::PlatformEventDispatcher:
  63   bool CanDispatchEvent(const ui::PlatformEvent& event) override {
  64     return true;
  65   }
  66
  67   uint32_t DispatchEvent(const ui::PlatformEvent& event) override {
  68     if (IsKeyEvent(event)) {
  69       ui::KeyEvent key_event(event);
  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     uint32_t perform_default = ui::POST_DISPATCH_PERFORM_DEFAULT;
  89     return prev ? prev->DispatchEvent(event) : 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 make_scoped_ptr(new NestedAcceleratorDispatcherLinux(delegate));
 101 }
 102
 103 }  // namespace wm