accessible/src/html/nsHTMLAreaAccessible.cpp

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   3  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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   5  * The contents of this file are subject to the Mozilla Public License Version
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  15  * The Original Code is mozilla.org code.
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  17  * The Initial Developer of the Original Code is
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  19  * Portions created by the Initial Developer are Copyright (C) 1998
  20  * the Initial Developer. All Rights Reserved.
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  22  * Contributor(s):
  23  *   Author: Aaron Leventhal (aaronl@netscape.com)
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  25  * Alternatively, the contents of this file may be used under the terms of
  26  * either of the GNU General Public License Version 2 or later (the "GPL"),
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  37  * ***** END LICENSE BLOCK ***** */
  38
  39 #include "nsHTMLAreaAccessible.h"
  40 #include "nsIServiceManager.h"
  41 #include "nsIDOMElement.h"
  42 #include "nsIDOMHTMLAreaElement.h"
  43 #include "nsIFrame.h"
  44 #include "nsIImageFrame.h"
  45 #include "nsIImageMap.h"
  46
  47
  48 ////////////////////////////////////////////////////////////////////////////////
  49 // nsHTMLAreaAccessible
  50
  51 nsHTMLAreaAccessible::
  52   nsHTMLAreaAccessible(nsIDOMNode *aDomNode, nsIAccessible *aParent,
  53                        nsIWeakReference* aShell):
  54   nsHTMLLinkAccessible(aDomNode, aShell)
  55 {
  56 }
  57
  58 ////////////////////////////////////////////////////////////////////////////////
  59 // nsIAccessible
  60
  61 nsresult
  62 nsHTMLAreaAccessible::GetNameInternal(nsAString & aName)
  63 {
  64   nsresult rv = nsAccessible::GetNameInternal(aName);
  65   NS_ENSURE_SUCCESS(rv, rv);
  66
  67   if (!aName.IsEmpty())
  68     return NS_OK;
  69
  70   nsCOMPtr<nsIContent> content(do_QueryInterface(mDOMNode));
  71   if (!content->GetAttr(kNameSpaceID_None, nsAccessibilityAtoms::alt,
  72                         aName)) {
  73     return GetValue(aName);
  74   }
  75
  76   return NS_OK;
  77 }
  78
  79 NS_IMETHODIMP
  80 nsHTMLAreaAccessible::GetDescription(nsAString& aDescription)
  81 {
  82   aDescription.Truncate();
  83
  84   // Still to do - follow IE's standard here
  85   nsCOMPtr<nsIDOMHTMLAreaElement> area(do_QueryInterface(mDOMNode));
  86   if (area)
  87     area->GetShape(aDescription);
  88
  89   return NS_OK;
  90 }
  91
  92 NS_IMETHODIMP
  93 nsHTMLAreaAccessible::GetFirstChild(nsIAccessible **aChild)
  94 {
  95   NS_ENSURE_ARG_POINTER(aChild);
  96
  97   *aChild = nsnull;
  98   return NS_OK;
  99 }
 100
 101 NS_IMETHODIMP
 102 nsHTMLAreaAccessible::GetLastChild(nsIAccessible **aChild)
 103 {
 104   NS_ENSURE_ARG_POINTER(aChild);
 105
 106   *aChild = nsnull;
 107   return NS_OK;
 108 }
 109
 110 NS_IMETHODIMP
 111 nsHTMLAreaAccessible::GetChildCount(PRInt32 *aCount)
 112 {
 113   NS_ENSURE_ARG_POINTER(aCount);
 114
 115   *aCount = 0;
 116   return NS_OK;
 117 }
 118
 119 NS_IMETHODIMP
 120 nsHTMLAreaAccessible::GetBounds(PRInt32 *x, PRInt32 *y,
 121                                 PRInt32 *width, PRInt32 *height)
 122 {
 123   // Essentially this uses GetRect on mAreas of nsImageMap from nsImageFrame
 124
 125   *x = *y = *width = *height = 0;
 126
 127   nsPresContext *presContext = GetPresContext();
 128   NS_ENSURE_TRUE(presContext, NS_ERROR_FAILURE);
 129
 130   nsCOMPtr<nsIContent> ourContent(do_QueryInterface(mDOMNode));
 131   NS_ENSURE_TRUE(ourContent, NS_ERROR_FAILURE);
 132
 133   nsIFrame *frame = GetFrame();
 134   NS_ENSURE_TRUE(frame, NS_ERROR_FAILURE);
 135   nsIImageFrame *imageFrame;
 136   nsresult rv = frame->QueryInterface(NS_GET_IID(nsIImageFrame), (void**)&imageFrame);
 137   NS_ENSURE_SUCCESS(rv, rv);
 138
 139   nsCOMPtr<nsIImageMap> map;
 140   imageFrame->GetImageMap(presContext, getter_AddRefs(map));
 141   NS_ENSURE_TRUE(map, NS_ERROR_FAILURE);
 142
 143   nsRect rect, orgRectPixels;
 144   rv = map->GetBoundsForAreaContent(ourContent, presContext, rect);
 145   NS_ENSURE_SUCCESS(rv, rv);
 146
 147   *x      = presContext->AppUnitsToDevPixels(rect.x);
 148   *y      = presContext->AppUnitsToDevPixels(rect.y);
 149
 150   // XXX Areas are screwy; they return their rects as a pair of points, one pair
 151   // stored into the width and height.
 152   *width  = presContext->AppUnitsToDevPixels(rect.width - rect.x);
 153   *height = presContext->AppUnitsToDevPixels(rect.height - rect.y);
 154
 155   // Put coords in absolute screen coords
 156   orgRectPixels = frame->GetScreenRectExternal();
 157   *x += orgRectPixels.x;
 158   *y += orgRectPixels.y;
 159
 160   return NS_OK;
 161 }
 162