1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* vim: set ts=2 et sw=2 tw=80: */
3 /* This Source Code Form is subject to the terms of the Mozilla Public
4 * License, v. 2.0. If a copy of the MPL was not distributed with this
5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
6
7 #include "InterfaceInitFuncs.h"
8
9 #include "Accessible-inl.h"
10 #include "AccessibleWrap.h"
11 #include "nsAccUtils.h"
12 #include "nsCoreUtils.h"
13 #include "nsMai.h"
14 #include "mozilla/Likely.h"
15 #include "mozilla/a11y/DocAccessibleParent.h"
16 #include "mozilla/a11y/ProxyAccessible.h"
17 #include "mozilla/dom/BrowserParent.h"
18
19 using namespace mozilla::a11y;
20
21 extern "C" {
22
refAccessibleAtPointCB(AtkComponent * aComponent,gint aAccX,gint aAccY,AtkCoordType aCoordType)23 static AtkObject* refAccessibleAtPointCB(AtkComponent* aComponent, gint aAccX,
24 gint aAccY, AtkCoordType aCoordType) {
25 return refAccessibleAtPointHelper(ATK_OBJECT(aComponent), aAccX, aAccY,
26 aCoordType);
27 }
28
getExtentsCB(AtkComponent * aComponent,gint * aX,gint * aY,gint * aWidth,gint * aHeight,AtkCoordType aCoordType)29 static void getExtentsCB(AtkComponent* aComponent, gint* aX, gint* aY,
30 gint* aWidth, gint* aHeight, AtkCoordType aCoordType) {
31 getExtentsHelper(ATK_OBJECT(aComponent), aX, aY, aWidth, aHeight, aCoordType);
32 }
33
grabFocusCB(AtkComponent * aComponent)34 static gboolean grabFocusCB(AtkComponent* aComponent) {
35 AtkObject* atkObject = ATK_OBJECT(aComponent);
36 AccessibleWrap* accWrap = GetAccessibleWrap(atkObject);
37 if (accWrap) {
38 accWrap->TakeFocus();
39 return TRUE;
40 }
41
42 ProxyAccessible* proxy = GetProxy(atkObject);
43 if (proxy) {
44 proxy->TakeFocus();
45 return TRUE;
46 }
47
48 return FALSE;
49 }
50
51 // ScrollType is compatible
52 MOZ_CAN_RUN_SCRIPT_BOUNDARY
scrollToCB(AtkComponent * aComponent,AtkScrollType type)53 static gboolean scrollToCB(AtkComponent* aComponent, AtkScrollType type) {
54 AtkObject* atkObject = ATK_OBJECT(aComponent);
55 if (RefPtr<AccessibleWrap> accWrap = GetAccessibleWrap(atkObject)) {
56 accWrap->ScrollTo(type);
57 return TRUE;
58 }
59
60 ProxyAccessible* proxy = GetProxy(atkObject);
61 if (proxy) {
62 proxy->ScrollTo(type);
63 return TRUE;
64 }
65
66 return FALSE;
67 }
68
69 // CoordType is compatible
scrollToPointCB(AtkComponent * aComponent,AtkCoordType coords,gint x,gint y)70 static gboolean scrollToPointCB(AtkComponent* aComponent, AtkCoordType coords,
71 gint x, gint y) {
72 AtkObject* atkObject = ATK_OBJECT(aComponent);
73 AccessibleWrap* accWrap = GetAccessibleWrap(atkObject);
74 if (accWrap) {
75 accWrap->ScrollToPoint(coords, x, y);
76 return TRUE;
77 }
78
79 ProxyAccessible* proxy = GetProxy(atkObject);
80 if (proxy) {
81 proxy->ScrollToPoint(coords, x, y);
82 return TRUE;
83 }
84
85 return FALSE;
86 }
87 }
88
refAccessibleAtPointHelper(AtkObject * aAtkObj,gint aX,gint aY,AtkCoordType aCoordType)89 AtkObject* refAccessibleAtPointHelper(AtkObject* aAtkObj, gint aX, gint aY,
90 AtkCoordType aCoordType) {
91 AccessibleOrProxy acc = GetInternalObj(aAtkObj);
92 if (acc.IsNull()) {
93 // This might be an ATK Socket.
94 acc = GetAccessibleWrap(aAtkObj);
95 if (acc.IsNull()) {
96 return nullptr;
97 }
98 }
99 if (acc.IsAccessible() && acc.AsAccessible()->IsDefunct()) {
100 return nullptr;
101 }
102
103 // AccessibleOrProxy::ChildAtPoint(x,y) is in screen pixels.
104 if (aCoordType == ATK_XY_WINDOW) {
105 nsINode* node = nullptr;
106 if (acc.IsAccessible()) {
107 node = acc.AsAccessible()->GetNode();
108 } else {
109 // Use the XUL browser embedding this remote document.
110 auto browser = static_cast<mozilla::dom::BrowserParent*>(
111 acc.AsProxy()->Document()->Manager());
112 node = browser->GetOwnerElement();
113 }
114 MOZ_ASSERT(node);
115 nsIntPoint winCoords = nsCoreUtils::GetScreenCoordsForWindow(node);
116 aX += winCoords.x;
117 aY += winCoords.y;
118 }
119
120 AccessibleOrProxy accAtPoint =
121 acc.ChildAtPoint(aX, aY, Accessible::eDeepestChild);
122 if (accAtPoint.IsNull()) {
123 return nullptr;
124 }
125 roles::Role role = accAtPoint.Role();
126 if (role == roles::TEXT_LEAF || role == roles::STATICTEXT) {
127 // We don't include text leaf nodes in the ATK tree, so return the parent.
128 accAtPoint = accAtPoint.Parent();
129 MOZ_ASSERT(!accAtPoint.IsNull(), "Text leaf should always have a parent");
130 }
131 AtkObject* atkObj = GetWrapperFor(accAtPoint);
132 if (atkObj) {
133 g_object_ref(atkObj);
134 }
135 return atkObj;
136 }
137
getExtentsHelper(AtkObject * aAtkObj,gint * aX,gint * aY,gint * aWidth,gint * aHeight,AtkCoordType aCoordType)138 void getExtentsHelper(AtkObject* aAtkObj, gint* aX, gint* aY, gint* aWidth,
139 gint* aHeight, AtkCoordType aCoordType) {
140 AccessibleWrap* accWrap = GetAccessibleWrap(aAtkObj);
141 *aX = *aY = *aWidth = *aHeight = -1;
142
143 if (accWrap) {
144 if (accWrap->IsDefunct()) {
145 return;
146 }
147
148 nsIntRect screenRect = accWrap->Bounds();
149 if (screenRect.IsEmpty()) return;
150
151 if (aCoordType == ATK_XY_WINDOW) {
152 nsIntPoint winCoords =
153 nsCoreUtils::GetScreenCoordsForWindow(accWrap->GetNode());
154 screenRect.x -= winCoords.x;
155 screenRect.y -= winCoords.y;
156 }
157
158 *aX = screenRect.x;
159 *aY = screenRect.y;
160 *aWidth = screenRect.width;
161 *aHeight = screenRect.height;
162 return;
163 }
164
165 if (ProxyAccessible* proxy = GetProxy(aAtkObj)) {
166 proxy->Extents(aCoordType == ATK_XY_WINDOW, aX, aY, aWidth, aHeight);
167 }
168 }
169
componentInterfaceInitCB(AtkComponentIface * aIface)170 void componentInterfaceInitCB(AtkComponentIface* aIface) {
171 NS_ASSERTION(aIface, "Invalid Interface");
172 if (MOZ_UNLIKELY(!aIface)) return;
173
174 /*
175 * Use default implementation in atk for contains, get_position,
176 * and get_size
177 */
178 aIface->ref_accessible_at_point = refAccessibleAtPointCB;
179 aIface->get_extents = getExtentsCB;
180 aIface->grab_focus = grabFocusCB;
181 if (IsAtkVersionAtLeast(2, 30)) {
182 aIface->scroll_to = scrollToCB;
183 aIface->scroll_to_point = scrollToPointCB;
184 }
185 }
186