/* -*- 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/. */
#include "nsCOMPtr.h"
#include "nsButtonBoxFrame.h"
#include "nsIContent.h"
#include "nsIDOMNodeList.h"
#include "nsIDOMXULButtonElement.h"
#include "nsGkAtoms.h"
#include "nsINameSpaceManager.h"
#include "nsPresContext.h"
#include "nsIPresShell.h"
#include "nsGUIEvent.h"
#include "nsEventStateManager.h"
#include "nsIDOMElement.h"
#include "nsDisplayList.h"
#include "nsContentUtils.h"
#include "mozilla/dom/Element.h"


//
// NS_NewXULButtonFrame
//
// Creates a new Button frame and returns it
//
nsIFrame*
NS_NewButtonBoxFrame (nsIPresShell* aPresShell, nsStyleContext* aContext)
{
  return new (aPresShell) nsButtonBoxFrame(aPresShell, aContext);
}

NS_IMPL_FRAMEARENA_HELPERS(nsButtonBoxFrame)

void
nsButtonBoxFrame::BuildDisplayListForChildren(nsDisplayListBuilder*   aBuilder,
                                              const nsRect&           aDirtyRect,
                                              const nsDisplayListSet& aLists)
{
  // override, since we don't want children to get events
  if (aBuilder->IsForEventDelivery())
    return;
  nsBoxFrame::BuildDisplayListForChildren(aBuilder, aDirtyRect, aLists);
}

NS_IMETHODIMP
nsButtonBoxFrame::HandleEvent(nsPresContext* aPresContext, 
                              nsGUIEvent* aEvent,
                              nsEventStatus* aEventStatus)
{
  NS_ENSURE_ARG_POINTER(aEventStatus);
  if (nsEventStatus_eConsumeNoDefault == *aEventStatus) {
    return NS_OK;
  }

  switch (aEvent->message) {
    case NS_KEY_DOWN:
      if (NS_KEY_EVENT == aEvent->eventStructType) {
        nsKeyEvent* keyEvent = (nsKeyEvent*)aEvent;
        if (NS_VK_SPACE == keyEvent->keyCode) {
          nsEventStateManager *esm = aPresContext->EventStateManager();
          // :hover:active state
          esm->SetContentState(mContent, NS_EVENT_STATE_HOVER);
          esm->SetContentState(mContent, NS_EVENT_STATE_ACTIVE);
        }
      }
      break;

// On mac, Return fires the defualt button, not the focused one.
#ifndef XP_MACOSX
    case NS_KEY_PRESS:
      if (NS_KEY_EVENT == aEvent->eventStructType) {
        nsKeyEvent* keyEvent = (nsKeyEvent*)aEvent;
        if (NS_VK_RETURN == keyEvent->keyCode) {
          nsCOMPtr<nsIDOMXULButtonElement> buttonEl(do_QueryInterface(mContent));
          if (buttonEl) {
            MouseClicked(aPresContext, aEvent);
            *aEventStatus = nsEventStatus_eConsumeNoDefault;
          }
        }
      }
      break;
#endif

    case NS_KEY_UP:
      if (NS_KEY_EVENT == aEvent->eventStructType) {
        nsKeyEvent* keyEvent = (nsKeyEvent*)aEvent;
        if (NS_VK_SPACE == keyEvent->keyCode) {
          // only activate on keyup if we're already in the :hover:active state
          NS_ASSERTION(mContent->IsElement(), "How do we have a non-element?");
          nsEventStates buttonState = mContent->AsElement()->State();
          if (buttonState.HasAllStates(NS_EVENT_STATE_ACTIVE |
                                       NS_EVENT_STATE_HOVER)) {
            // return to normal state
            nsEventStateManager *esm = aPresContext->EventStateManager();
            esm->SetContentState(nullptr, NS_EVENT_STATE_ACTIVE);
            esm->SetContentState(nullptr, NS_EVENT_STATE_HOVER);
            MouseClicked(aPresContext, aEvent);
          }
        }
      }
      break;

    case NS_MOUSE_CLICK:
      if (NS_IS_MOUSE_LEFT_CLICK(aEvent)) {
        MouseClicked(aPresContext, aEvent);
      }
      break;
  }

  return nsBoxFrame::HandleEvent(aPresContext, aEvent, aEventStatus);
}

void 
nsButtonBoxFrame::DoMouseClick(nsGUIEvent* aEvent, bool aTrustEvent) 
{
  // Don't execute if we're disabled.
  if (mContent->AttrValueIs(kNameSpaceID_None, nsGkAtoms::disabled,
                            nsGkAtoms::_true, eCaseMatters))
    return;

  // Execute the oncommand event handler.
  bool isShift = false;
  bool isControl = false;
  bool isAlt = false;
  bool isMeta = false;
  if(aEvent) {
    isShift = ((nsInputEvent*)(aEvent))->IsShift();
    isControl = ((nsInputEvent*)(aEvent))->IsControl();
    isAlt = ((nsInputEvent*)(aEvent))->IsAlt();
    isMeta = ((nsInputEvent*)(aEvent))->IsMeta();
  }

  // Have the content handle the event, propagating it according to normal DOM rules.
  nsCOMPtr<nsIPresShell> shell = PresContext()->GetPresShell();
  if (shell) {
    nsContentUtils::DispatchXULCommand(mContent,
                                       aEvent ?
                                         aEvent->mFlags.mIsTrusted : aTrustEvent,
                                       nullptr, shell,
                                       isControl, isAlt, isShift, isMeta);
  }
}