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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/. */
/* 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, nsStyleContext* aContext)
{
nsXULLabelFrame* it = new (aPresShell) nsXULLabelFrame(aContext);
it->AddStateBits(NS_BLOCK_FLOAT_MGR | NS_BLOCK_MARGIN_ROOT);
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)
{
// if we have no content, we can't do anything
if (!mContent)
return NS_ERROR_FAILURE;
// 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->HasAttr(kNameSpaceID_None, nsGkAtoms::control))
return NS_OK;
nsAutoString accessKey;
mContent->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, key);
else
esm->UnregisterAccessKey(mContent, 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)
{
// unregister access key
RegUnregAccessKey(false);
nsBlockFrame::DestroyFrom(aDestructRoot);
}
nsresult
nsXULLabelFrame::AttributeChanged(int32_t aNameSpaceID,
nsIAtom* 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;
}
nsIAtom*
nsXULLabelFrame::GetType() const
{
return nsGkAtoms::XULLabelFrame;
}
/////////////////////////////////////////////////////////////////////////////
// Diagnostics
#ifdef DEBUG_FRAME_DUMP
nsresult
nsXULLabelFrame::GetFrameName(nsAString& aResult) const
{
return MakeFrameName(NS_LITERAL_STRING("XULLabel"), aResult);
}
#endif
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