/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

/* 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/. */

/* derived class of nsBlockFrame used for xul:label elements */

#include "mozilla/EventStateManager.h"

#include "nsXULLabelFrame.h"

#include "nsHTMLParts.h"

#include "nsNameSpaceManager.h"

using namespace mozilla;

nsIFrame*

NS_NewXULLabelFrame(nsIPresShell* aPresShell, ComputedStyle* aStyle)

{

  nsXULLabelFrame* it = new (aPresShell) nsXULLabelFrame(aStyle);

  it->AddStateBits(NS_BLOCK_FORMATTING_CONTEXT_STATE_BITS);

  return it;

}

NS_IMPL_FRAMEARENA_HELPERS(nsXULLabelFrame)

// If you make changes to this function, check its counterparts

// in nsBoxFrame and nsTextBoxFrame

nsresult

nsXULLabelFrame::RegUnregAccessKey(bool aDoReg)

{

  // To filter out <label>s without a control attribute.

  // XXXjag a side-effect is that we filter out anonymous <label>s

  // in e.g. <menu>, <menuitem>, <button>. These <label>s inherit

  // |accesskey| and would otherwise register themselves, overwriting

  // the content we really meant to be registered.

  if (!mContent->AsElement()->HasAttr(kNameSpaceID_None, nsGkAtoms::control))

    return NS_OK;

  nsAutoString accessKey;

  mContent->AsElement()->GetAttr(kNameSpaceID_None, nsGkAtoms::accesskey, accessKey);

  if (accessKey.IsEmpty())

    return NS_OK;

  // With a valid PresContext we can get the ESM

  // and register the access key

  EventStateManager* esm = PresContext()->EventStateManager();

  uint32_t key = accessKey.First();

  if (aDoReg)

    esm->RegisterAccessKey(mContent->AsElement(), key);

  else

    esm->UnregisterAccessKey(mContent->AsElement(), key);

  return NS_OK;

}

/////////////////////////////////////////////////////////////////////////////

// nsIFrame

void

nsXULLabelFrame::Init(nsIContent*       aContent,

                      nsContainerFrame* aParent,

                      nsIFrame*         aPrevInFlow)

{

  nsBlockFrame::Init(aContent, aParent, aPrevInFlow);

  // register access key

  RegUnregAccessKey(true);

}

void

nsXULLabelFrame::DestroyFrom(nsIFrame* aDestructRoot, PostDestroyData& aPostDestroyData)

{

  // unregister access key

  RegUnregAccessKey(false);

  nsBlockFrame::DestroyFrom(aDestructRoot, aPostDestroyData);

}

nsresult

nsXULLabelFrame::AttributeChanged(int32_t aNameSpaceID,

                                  nsAtom* aAttribute,

                                  int32_t aModType)

{

  nsresult rv = nsBlockFrame::AttributeChanged(aNameSpaceID,

                                               aAttribute, aModType);

  // If the accesskey changed, register for the new value

  // The old value has been unregistered in nsXULElement::SetAttr

  if (aAttribute == nsGkAtoms::accesskey || aAttribute == nsGkAtoms::control)

    RegUnregAccessKey(true);

  return rv;

}

/////////////////////////////////////////////////////////////////////////////

// Diagnostics

#ifdef DEBUG_FRAME_DUMP

nsresult

nsXULLabelFrame::GetFrameName(nsAString& aResult) const

{

  return MakeFrameName(NS_LITERAL_STRING("XULLabel"), aResult);

}

#endif