The Tor Browser: layout/xul/nsXULLabelFrame.cpp@925c144e1f1f

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

     2 /* This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

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

     8 #include "mozilla/EventStateManager.h"

     9 #include "nsXULLabelFrame.h"

    10 #include "nsHTMLParts.h"

    11 #include "nsNameSpaceManager.h"

    13 using namespace mozilla;

    15 nsIFrame*

    16 NS_NewXULLabelFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)

    17 {

    18   nsXULLabelFrame* it = new (aPresShell) nsXULLabelFrame(aContext);

    20   it->SetFlags(NS_BLOCK_FLOAT_MGR | NS_BLOCK_MARGIN_ROOT);

    22   return it;

    23 }

    25 NS_IMPL_FRAMEARENA_HELPERS(nsXULLabelFrame)

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

    28 // in nsBoxFrame and nsTextBoxFrame

    29 nsresult

    30 nsXULLabelFrame::RegUnregAccessKey(bool aDoReg)

    31 {

    32   // if we have no content, we can't do anything

    33   if (!mContent)

    34     return NS_ERROR_FAILURE;

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

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

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

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

    40   // the content we really meant to be registered.

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

    42     return NS_OK;

    44   nsAutoString accessKey;

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

    47   if (accessKey.IsEmpty())

    48     return NS_OK;

    50   // With a valid PresContext we can get the ESM

    51   // and register the access key

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

    54   uint32_t key = accessKey.First();

    55   if (aDoReg)

    56     esm->RegisterAccessKey(mContent, key);

    57   else

    58     esm->UnregisterAccessKey(mContent, key);

    60   return NS_OK;

    61 }

    63 /////////////////////////////////////////////////////////////////////////////

    64 // nsIFrame

    66 void

    67 nsXULLabelFrame::Init(nsIContent*      aContent,

    68                       nsIFrame*        aParent,

    69                       nsIFrame*        aPrevInFlow)

    70 {

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

    73   // register access key

    74   RegUnregAccessKey(true);

    75 }

    77 void

    78 nsXULLabelFrame::DestroyFrom(nsIFrame* aDestructRoot)

    79 {

    80   // unregister access key

    81   RegUnregAccessKey(false);

    82   nsBlockFrame::DestroyFrom(aDestructRoot);

    83 }

    85 nsresult

    86 nsXULLabelFrame::AttributeChanged(int32_t aNameSpaceID,

    87                                   nsIAtom* aAttribute,

    88                                   int32_t aModType)

    89 {

    90   nsresult rv = nsBlockFrame::AttributeChanged(aNameSpaceID,

    91                                                aAttribute, aModType);

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

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

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

    96     RegUnregAccessKey(true);

    98   return rv;

    99 }

   101 nsIAtom*

   102 nsXULLabelFrame::GetType() const

   103 {

   104   return nsGkAtoms::XULLabelFrame;

   105 }

   107 /////////////////////////////////////////////////////////////////////////////

   108 // Diagnostics

   110 #ifdef DEBUG_FRAME_DUMP

   111 nsresult

   112 nsXULLabelFrame::GetFrameName(nsAString& aResult) const

   113 {

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

   115 }

   116 #endif

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