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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef mozilla_MiscEvents_h__
#define mozilla_MiscEvents_h__

#include <stdint.h>

#include "mozilla/BasicEvents.h"
#include "nsCOMPtr.h"
#include "nsIAtom.h"
#include "nsITransferable.h"

namespace mozilla {

namespace dom {
  class PBrowserParent;
  class PBrowserChild;
} // namespace dom

/******************************************************************************
 * mozilla::WidgetContentCommandEvent
 ******************************************************************************/

class WidgetContentCommandEvent : public WidgetGUIEvent
{
public:
  virtual WidgetContentCommandEvent* AsContentCommandEvent() override
  {
    return this;
  }

  WidgetContentCommandEvent(bool aIsTrusted, EventMessage aMessage,
                            nsIWidget* aWidget,
                            bool aOnlyEnabledCheck = false)
    : WidgetGUIEvent(aIsTrusted, aMessage, aWidget, eContentCommandEventClass)
    , mOnlyEnabledCheck(aOnlyEnabledCheck)
    , mSucceeded(false)
    , mIsEnabled(false)
  {
  }

  virtual WidgetEvent* Duplicate() const override
  {
    // This event isn't an internal event of any DOM event.
    NS_ASSERTION(!IsAllowedToDispatchDOMEvent(),
      "WidgetQueryContentEvent needs to support Duplicate()");
    MOZ_CRASH("WidgetQueryContentEvent doesn't support Duplicate()");
    return nullptr;
  }

  // eContentCommandPasteTransferable
  nsCOMPtr<nsITransferable> mTransferable; // [in]

  // eContentCommandScroll
  // for mScroll.mUnit
  enum
  {
    eCmdScrollUnit_Line,
    eCmdScrollUnit_Page,
    eCmdScrollUnit_Whole
  };

  struct ScrollInfo
  {
    ScrollInfo() :
      mAmount(0), mUnit(eCmdScrollUnit_Line), mIsHorizontal(false)
    {
    }

    int32_t mAmount;    // [in]
    uint8_t mUnit;      // [in]
    bool mIsHorizontal; // [in]
  } mScroll;

  bool mOnlyEnabledCheck; // [in]

  bool mSucceeded; // [out]
  bool mIsEnabled; // [out]

  void AssignContentCommandEventData(const WidgetContentCommandEvent& aEvent,
                                     bool aCopyTargets)
  {
    AssignGUIEventData(aEvent, aCopyTargets);

    mScroll = aEvent.mScroll;
    mOnlyEnabledCheck = aEvent.mOnlyEnabledCheck;
    mSucceeded = aEvent.mSucceeded;
    mIsEnabled = aEvent.mIsEnabled;
  }
};

/******************************************************************************
 * mozilla::WidgetCommandEvent
 *
 * This sends a command to chrome.  If you want to request what is performed
 * in focused content, you should use WidgetContentCommandEvent instead.
 *
 * XXX Should be |WidgetChromeCommandEvent|?
 ******************************************************************************/

class WidgetCommandEvent : public WidgetGUIEvent
{
public:
  virtual WidgetCommandEvent* AsCommandEvent() override { return this; }

  WidgetCommandEvent(bool aIsTrusted, nsIAtom* aEventType,
                     nsIAtom* aCommand, nsIWidget* aWidget)
    : WidgetGUIEvent(aIsTrusted, eUnidentifiedEvent, aWidget,
                     eCommandEventClass)
    , mCommand(aCommand)
  {
    mSpecifiedEventType = aEventType;
  }

  virtual WidgetEvent* Duplicate() const override
  {
    MOZ_ASSERT(mClass == eCommandEventClass,
               "Duplicate() must be overridden by sub class");
    // Not copying widget, it is a weak reference.
    WidgetCommandEvent* result =
      new WidgetCommandEvent(false, mSpecifiedEventType, mCommand, nullptr);
    result->AssignCommandEventData(*this, true);
    result->mFlags = mFlags;
    return result;
  }

  nsCOMPtr<nsIAtom> mCommand;

  // XXX Not tested by test_assign_event_data.html
  void AssignCommandEventData(const WidgetCommandEvent& aEvent,
                              bool aCopyTargets)
  {
    AssignGUIEventData(aEvent, aCopyTargets);

    // mCommand must have been initialized with the constructor.
  }
};

/******************************************************************************
 * mozilla::WidgetPluginEvent
 *
 * This event delivers only a native event to focused plugin.
 ******************************************************************************/

class WidgetPluginEvent : public WidgetGUIEvent
{
private:
  friend class dom::PBrowserParent;
  friend class dom::PBrowserChild;

public:
  virtual WidgetPluginEvent* AsPluginEvent() override { return this; }

  WidgetPluginEvent(bool aIsTrusted, EventMessage aMessage, nsIWidget* aWidget)
    : WidgetGUIEvent(aIsTrusted, aMessage, aWidget, ePluginEventClass)
    , mRetargetToFocusedDocument(false)
  {
  }

  virtual WidgetEvent* Duplicate() const override
  {
    // NOTE: PluginEvent has to be dispatched to nsIFrame::HandleEvent().
    //       So, this event needs to support Duplicate().
    MOZ_ASSERT(mClass == ePluginEventClass,
               "Duplicate() must be overridden by sub class");
    // Not copying widget, it is a weak reference.
    WidgetPluginEvent* result = new WidgetPluginEvent(false, mMessage, nullptr);
    result->AssignPluginEventData(*this, true);
    result->mFlags = mFlags;
    return result;
  }

  // If true, this event needs to be retargeted to focused document.
  // Otherwise, never retargeted. Defaults to false.
  bool mRetargetToFocusedDocument;

  void AssignPluginEventData(const WidgetPluginEvent& aEvent,
                             bool aCopyTargets)
  {
    AssignGUIEventData(aEvent, aCopyTargets);

    mRetargetToFocusedDocument = aEvent.mRetargetToFocusedDocument;
  }

protected:
  WidgetPluginEvent()
  {
  }
};

} // namespace mozilla

#endif // mozilla_MiscEvents_h__