115 lines
3.2 KiB
C++
115 lines
3.2 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* derived class of nsBlockFrame used for xul:label elements */
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#include "mozilla/EventStateManager.h"
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#include "nsXULLabelFrame.h"
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#include "nsHTMLParts.h"
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#include "nsNameSpaceManager.h"
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using namespace mozilla;
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nsIFrame*
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NS_NewXULLabelFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
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{
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nsXULLabelFrame* it = new (aPresShell) nsXULLabelFrame(aContext);
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it->AddStateBits(NS_BLOCK_FORMATTING_CONTEXT_STATE_BITS);
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return it;
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}
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NS_IMPL_FRAMEARENA_HELPERS(nsXULLabelFrame)
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// If you make changes to this function, check its counterparts
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// in nsBoxFrame and nsTextBoxFrame
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nsresult
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nsXULLabelFrame::RegUnregAccessKey(bool aDoReg)
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{
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// if we have no content, we can't do anything
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if (!mContent)
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return NS_ERROR_FAILURE;
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// To filter out <label>s without a control attribute.
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// XXXjag a side-effect is that we filter out anonymous <label>s
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// in e.g. <menu>, <menuitem>, <button>. These <label>s inherit
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// |accesskey| and would otherwise register themselves, overwriting
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// the content we really meant to be registered.
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if (!mContent->HasAttr(kNameSpaceID_None, nsGkAtoms::control))
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return NS_OK;
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nsAutoString accessKey;
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mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::accesskey, accessKey);
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if (accessKey.IsEmpty())
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return NS_OK;
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// With a valid PresContext we can get the ESM
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// and register the access key
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EventStateManager* esm = PresContext()->EventStateManager();
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uint32_t key = accessKey.First();
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if (aDoReg)
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esm->RegisterAccessKey(mContent, key);
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else
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esm->UnregisterAccessKey(mContent, key);
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return NS_OK;
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}
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/////////////////////////////////////////////////////////////////////////////
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// nsIFrame
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void
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nsXULLabelFrame::Init(nsIContent* aContent,
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nsContainerFrame* aParent,
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nsIFrame* aPrevInFlow)
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{
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nsBlockFrame::Init(aContent, aParent, aPrevInFlow);
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// register access key
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RegUnregAccessKey(true);
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}
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void
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nsXULLabelFrame::DestroyFrom(nsIFrame* aDestructRoot)
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{
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// unregister access key
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RegUnregAccessKey(false);
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nsBlockFrame::DestroyFrom(aDestructRoot);
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}
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nsresult
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nsXULLabelFrame::AttributeChanged(int32_t aNameSpaceID,
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nsIAtom* aAttribute,
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int32_t aModType)
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{
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nsresult rv = nsBlockFrame::AttributeChanged(aNameSpaceID,
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aAttribute, aModType);
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// If the accesskey changed, register for the new value
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// The old value has been unregistered in nsXULElement::SetAttr
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if (aAttribute == nsGkAtoms::accesskey || aAttribute == nsGkAtoms::control)
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RegUnregAccessKey(true);
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return rv;
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}
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nsIAtom*
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nsXULLabelFrame::GetType() const
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{
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return nsGkAtoms::XULLabelFrame;
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}
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/////////////////////////////////////////////////////////////////////////////
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// Diagnostics
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#ifdef DEBUG_FRAME_DUMP
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nsresult
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nsXULLabelFrame::GetFrameName(nsAString& aResult) const
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{
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return MakeFrameName(NS_LITERAL_STRING("XULLabel"), aResult);
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}
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#endif
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