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-rw-r--r--accessible/atk/nsMaiInterfaceText.cpp564
1 files changed, 564 insertions, 0 deletions
diff --git a/accessible/atk/nsMaiInterfaceText.cpp b/accessible/atk/nsMaiInterfaceText.cpp
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+++ b/accessible/atk/nsMaiInterfaceText.cpp
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* 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/. */
+
+#include "InterfaceInitFuncs.h"
+#include "mozilla/a11y/PDocAccessible.h"
+#include "nsAccessibilityService.h"
+#include "LocalAccessible-inl.h"
+#include "HyperTextAccessible-inl.h"
+#include "nsMai.h"
+#include "RemoteAccessible.h"
+#include "AccAttributes.h"
+
+#include "nsIAccessibleTypes.h"
+#include "nsISimpleEnumerator.h"
+#include "nsUTF8Utils.h"
+
+#include "mozilla/Likely.h"
+
+#include "DOMtoATK.h"
+
+using namespace mozilla;
+using namespace mozilla::a11y;
+
+static const char* sAtkTextAttrNames[ATK_TEXT_ATTR_LAST_DEFINED];
+
+static AtkAttributeSet* ConvertToAtkTextAttributeSet(
+ AccAttributes* aAttributes) {
+ if (!aAttributes) {
+ // This can happen if an Accessible dies in the content process, but the
+ // parent hasn't been udpated yet.
+ return nullptr;
+ }
+
+ AtkAttributeSet* atkAttributeSet = nullptr;
+
+ for (auto iter : *aAttributes) {
+ AtkAttribute* atkAttr = (AtkAttribute*)g_malloc(sizeof(AtkAttribute));
+ nsAutoString value;
+ // We set atkAttr->name directly for each case. For the value, we set the
+ // value string for each case. atkAttr->value is set at the end based on the
+ // value string.
+
+ // Set atkAttr->name to a specific ATK attribute name.
+ auto atkName = [&atkAttr](AtkTextAttribute aAttrNum) {
+ atkAttr->name = g_strdup(sAtkTextAttrNames[aAttrNum]);
+ };
+ // Set value to a formatted ATK color value.
+ auto colorValue = [&iter, &value] {
+ // The format of the atk attribute is r,g,b and the gecko one is
+ // rgb(r, g, b).
+ auto color = iter.Value<Color>();
+ MOZ_ASSERT(color);
+ value.AppendInt(NS_GET_R(color->mValue));
+ value.Append(',');
+ value.AppendInt(NS_GET_G(color->mValue));
+ value.Append(',');
+ value.AppendInt(NS_GET_B(color->mValue));
+ };
+
+ nsAtom* name = iter.Name();
+ if (name == nsGkAtoms::color) {
+ atkName(ATK_TEXT_ATTR_FG_COLOR);
+ colorValue();
+ } else if (name == nsGkAtoms::backgroundColor) {
+ atkName(ATK_TEXT_ATTR_BG_COLOR);
+ colorValue();
+ } else if (name == nsGkAtoms::font_family) {
+ atkName(ATK_TEXT_ATTR_FAMILY_NAME);
+ iter.ValueAsString(value);
+ } else if (name == nsGkAtoms::font_size) {
+ atkName(ATK_TEXT_ATTR_SIZE);
+ // ATK wants the number of points without pt at the end.
+ auto fontSize = iter.Value<FontSize>();
+ MOZ_ASSERT(fontSize);
+ value.AppendInt(fontSize->mValue);
+ } else if (name == nsGkAtoms::fontWeight) {
+ atkName(ATK_TEXT_ATTR_WEIGHT);
+ iter.ValueAsString(value);
+ } else if (name == nsGkAtoms::invalid) {
+ atkName(ATK_TEXT_ATTR_INVALID);
+ iter.ValueAsString(value);
+ } else {
+ nsAutoString nameStr;
+ iter.NameAsString(nameStr);
+ atkAttr->name = g_strdup(NS_ConvertUTF16toUTF8(nameStr).get());
+ iter.ValueAsString(value);
+ }
+
+ atkAttr->value = g_strdup(NS_ConvertUTF16toUTF8(value).get());
+ atkAttributeSet = g_slist_prepend(atkAttributeSet, atkAttr);
+ }
+
+ // libatk-adaptor will free it
+ return atkAttributeSet;
+}
+
+extern "C" {
+
+static gchar* getTextCB(AtkText* aText, gint aStartOffset, gint aEndOffset) {
+ Accessible* acc = GetInternalObj(ATK_OBJECT(aText));
+ if (!acc || !acc->IsTextRole()) {
+ return nullptr;
+ }
+ HyperTextAccessibleBase* text = acc->AsHyperTextBase();
+ if (!text) {
+ return nullptr;
+ }
+ return DOMtoATK::NewATKString(text, aStartOffset, aEndOffset);
+}
+
+static gint getCharacterCountCB(AtkText* aText);
+
+// Note: this does not support magic offsets, which is fine for its callers
+// which do not implement any.
+static gchar* getCharTextAtOffset(AtkText* aText, gint aOffset,
+ gint* aStartOffset, gint* aEndOffset) {
+ gint end = aOffset + 1;
+ gint count = getCharacterCountCB(aText);
+
+ if (aOffset > count) {
+ aOffset = count;
+ }
+ if (end > count) {
+ end = count;
+ }
+ if (aOffset < 0) {
+ aOffset = 0;
+ }
+ if (end < 0) {
+ end = 0;
+ }
+ *aStartOffset = aOffset;
+ *aEndOffset = end;
+
+ return getTextCB(aText, aOffset, end);
+}
+
+static gchar* getTextAfterOffsetCB(AtkText* aText, gint aOffset,
+ AtkTextBoundary aBoundaryType,
+ gint* aStartOffset, gint* aEndOffset) {
+ if (aBoundaryType == ATK_TEXT_BOUNDARY_CHAR) {
+ return getCharTextAtOffset(aText, aOffset + 1, aStartOffset, aEndOffset);
+ }
+
+ Accessible* acc = GetInternalObj(ATK_OBJECT(aText));
+ if (!acc) {
+ return nullptr;
+ }
+
+ HyperTextAccessibleBase* text = acc->AsHyperTextBase();
+ if (!text || !acc->IsTextRole()) {
+ return nullptr;
+ }
+
+ nsAutoString autoStr;
+ int32_t startOffset = 0, endOffset = 0;
+ text->TextAfterOffset(aOffset, aBoundaryType, &startOffset, &endOffset,
+ autoStr);
+
+ *aStartOffset = startOffset;
+ *aEndOffset = endOffset;
+
+ // libspi will free it.
+ return DOMtoATK::Convert(autoStr);
+}
+
+static gchar* getTextAtOffsetCB(AtkText* aText, gint aOffset,
+ AtkTextBoundary aBoundaryType,
+ gint* aStartOffset, gint* aEndOffset) {
+ if (aBoundaryType == ATK_TEXT_BOUNDARY_CHAR) {
+ return getCharTextAtOffset(aText, aOffset, aStartOffset, aEndOffset);
+ }
+
+ Accessible* acc = GetInternalObj(ATK_OBJECT(aText));
+ if (!acc) {
+ return nullptr;
+ }
+
+ HyperTextAccessibleBase* text = acc->AsHyperTextBase();
+ if (!text || !acc->IsTextRole()) {
+ return nullptr;
+ }
+
+ nsAutoString autoStr;
+ int32_t startOffset = 0, endOffset = 0;
+ text->TextAtOffset(aOffset, aBoundaryType, &startOffset, &endOffset, autoStr);
+
+ *aStartOffset = startOffset;
+ *aEndOffset = endOffset;
+
+ // libspi will free it.
+ return DOMtoATK::Convert(autoStr);
+}
+
+static gunichar getCharacterAtOffsetCB(AtkText* aText, gint aOffset) {
+ Accessible* acc = GetInternalObj(ATK_OBJECT(aText));
+ if (!acc) {
+ return 0;
+ }
+
+ HyperTextAccessibleBase* text = acc->AsHyperTextBase();
+ if (text) {
+ return DOMtoATK::ATKCharacter(text, aOffset);
+ }
+
+ return 0;
+}
+
+static gchar* getTextBeforeOffsetCB(AtkText* aText, gint aOffset,
+ AtkTextBoundary aBoundaryType,
+ gint* aStartOffset, gint* aEndOffset) {
+ if (aBoundaryType == ATK_TEXT_BOUNDARY_CHAR) {
+ return getCharTextAtOffset(aText, aOffset - 1, aStartOffset, aEndOffset);
+ }
+
+ Accessible* acc = GetInternalObj(ATK_OBJECT(aText));
+ if (!acc) {
+ return nullptr;
+ }
+
+ HyperTextAccessibleBase* text = acc->AsHyperTextBase();
+ if (!text || !acc->IsTextRole()) {
+ return nullptr;
+ }
+
+ nsAutoString autoStr;
+ int32_t startOffset = 0, endOffset = 0;
+ text->TextBeforeOffset(aOffset, aBoundaryType, &startOffset, &endOffset,
+ autoStr);
+
+ *aStartOffset = startOffset;
+ *aEndOffset = endOffset;
+
+ // libspi will free it.
+ return DOMtoATK::Convert(autoStr);
+}
+
+static gint getCaretOffsetCB(AtkText* aText) {
+ Accessible* acc = GetInternalObj(ATK_OBJECT(aText));
+ if (!acc) {
+ return -1;
+ }
+
+ HyperTextAccessibleBase* text = acc->AsHyperTextBase();
+ if (!text || !acc->IsTextRole()) {
+ return -1;
+ }
+
+ return static_cast<gint>(text->CaretOffset());
+}
+
+static AtkAttributeSet* getRunAttributesCB(AtkText* aText, gint aOffset,
+ gint* aStartOffset,
+ gint* aEndOffset) {
+ *aStartOffset = -1;
+ *aEndOffset = -1;
+ int32_t startOffset = 0, endOffset = 0;
+
+ Accessible* acc = GetInternalObj(ATK_OBJECT(aText));
+ if (!acc) {
+ return nullptr;
+ }
+
+ HyperTextAccessibleBase* text = acc->AsHyperTextBase();
+ if (!text || !acc->IsTextRole()) {
+ return nullptr;
+ }
+
+ RefPtr<AccAttributes> attributes =
+ text->TextAttributes(false, aOffset, &startOffset, &endOffset);
+
+ *aStartOffset = startOffset;
+ *aEndOffset = endOffset;
+
+ return ConvertToAtkTextAttributeSet(attributes);
+}
+
+static AtkAttributeSet* getDefaultAttributesCB(AtkText* aText) {
+ Accessible* acc = GetInternalObj(ATK_OBJECT(aText));
+ if (!acc) {
+ return nullptr;
+ }
+
+ HyperTextAccessibleBase* text = acc->AsHyperTextBase();
+ if (!text || !acc->IsTextRole()) {
+ return nullptr;
+ }
+
+ RefPtr<AccAttributes> attributes = text->DefaultTextAttributes();
+ return ConvertToAtkTextAttributeSet(attributes);
+}
+
+static void getCharacterExtentsCB(AtkText* aText, gint aOffset, gint* aX,
+ gint* aY, gint* aWidth, gint* aHeight,
+ AtkCoordType aCoords) {
+ if (!aX || !aY || !aWidth || !aHeight) {
+ return;
+ }
+ *aX = *aY = *aWidth = *aHeight = -1;
+
+ uint32_t geckoCoordType;
+ if (aCoords == ATK_XY_SCREEN) {
+ geckoCoordType = nsIAccessibleCoordinateType::COORDTYPE_SCREEN_RELATIVE;
+ } else {
+ geckoCoordType = nsIAccessibleCoordinateType::COORDTYPE_WINDOW_RELATIVE;
+ }
+
+ Accessible* acc = GetInternalObj(ATK_OBJECT(aText));
+ if (!acc) {
+ return;
+ }
+
+ HyperTextAccessibleBase* text = acc->AsHyperTextBase();
+ if (!text || !acc->IsTextRole()) {
+ return;
+ }
+
+ LayoutDeviceIntRect rect = text->CharBounds(aOffset, geckoCoordType);
+
+ *aX = rect.x;
+ *aY = rect.y;
+ *aWidth = rect.width;
+ *aHeight = rect.height;
+}
+
+static void getRangeExtentsCB(AtkText* aText, gint aStartOffset,
+ gint aEndOffset, AtkCoordType aCoords,
+ AtkTextRectangle* aRect) {
+ if (!aRect) {
+ return;
+ }
+ aRect->x = aRect->y = aRect->width = aRect->height = -1;
+
+ uint32_t geckoCoordType;
+ if (aCoords == ATK_XY_SCREEN) {
+ geckoCoordType = nsIAccessibleCoordinateType::COORDTYPE_SCREEN_RELATIVE;
+ } else {
+ geckoCoordType = nsIAccessibleCoordinateType::COORDTYPE_WINDOW_RELATIVE;
+ }
+
+ Accessible* acc = GetInternalObj(ATK_OBJECT(aText));
+ if (!acc) {
+ return;
+ }
+
+ HyperTextAccessibleBase* text = acc->AsHyperTextBase();
+ if (!text || !acc->IsTextRole()) {
+ return;
+ }
+
+ LayoutDeviceIntRect rect =
+ text->TextBounds(aStartOffset, aEndOffset, geckoCoordType);
+
+ aRect->x = rect.x;
+ aRect->y = rect.y;
+ aRect->width = rect.width;
+ aRect->height = rect.height;
+}
+
+static gint getCharacterCountCB(AtkText* aText) {
+ if (Accessible* acc = GetInternalObj(ATK_OBJECT(aText))) {
+ if (HyperTextAccessibleBase* text = acc->AsHyperTextBase()) {
+ return static_cast<gint>(text->CharacterCount());
+ }
+ }
+ return 0;
+}
+
+static gint getOffsetAtPointCB(AtkText* aText, gint aX, gint aY,
+ AtkCoordType aCoords) {
+ Accessible* acc = GetInternalObj(ATK_OBJECT(aText));
+ if (!acc) {
+ return -1;
+ }
+ HyperTextAccessibleBase* text = acc->AsHyperTextBase();
+ if (!text || !acc->IsTextRole()) {
+ return -1;
+ }
+ return static_cast<gint>(text->OffsetAtPoint(
+ aX, aY,
+ (aCoords == ATK_XY_SCREEN
+ ? nsIAccessibleCoordinateType::COORDTYPE_SCREEN_RELATIVE
+ : nsIAccessibleCoordinateType::COORDTYPE_WINDOW_RELATIVE)));
+}
+
+static gint getTextSelectionCountCB(AtkText* aText) {
+ Accessible* acc = GetInternalObj(ATK_OBJECT(aText));
+ if (!acc) {
+ return 0;
+ }
+
+ HyperTextAccessibleBase* text = acc->AsHyperTextBase();
+ if (!text || !acc->IsTextRole()) {
+ return 0;
+ }
+
+ return text->SelectionCount();
+}
+
+static gchar* getTextSelectionCB(AtkText* aText, gint aSelectionNum,
+ gint* aStartOffset, gint* aEndOffset) {
+ Accessible* acc = GetInternalObj(ATK_OBJECT(aText));
+ if (!acc) {
+ return nullptr;
+ }
+
+ int32_t startOffset = 0, endOffset = 0;
+ HyperTextAccessibleBase* text = acc->AsHyperTextBase();
+ if (!text || !acc->IsTextRole()) {
+ return nullptr;
+ }
+
+ text->SelectionBoundsAt(aSelectionNum, &startOffset, &endOffset);
+ *aStartOffset = startOffset;
+ *aEndOffset = endOffset;
+
+ return getTextCB(aText, *aStartOffset, *aEndOffset);
+}
+
+// set methods
+static gboolean addTextSelectionCB(AtkText* aText, gint aStartOffset,
+ gint aEndOffset) {
+ AccessibleWrap* accWrap = GetAccessibleWrap(ATK_OBJECT(aText));
+ if (accWrap) {
+ HyperTextAccessible* text = accWrap->AsHyperText();
+ if (!text || !text->IsTextRole()) {
+ return FALSE;
+ }
+
+ return text->AddToSelection(aStartOffset, aEndOffset);
+ }
+ if (RemoteAccessible* proxy = GetProxy(ATK_OBJECT(aText))) {
+ return proxy->AddToSelection(aStartOffset, aEndOffset);
+ }
+
+ return FALSE;
+}
+
+static gboolean removeTextSelectionCB(AtkText* aText, gint aSelectionNum) {
+ AccessibleWrap* accWrap = GetAccessibleWrap(ATK_OBJECT(aText));
+ if (accWrap) {
+ HyperTextAccessible* text = accWrap->AsHyperText();
+ if (!text || !text->IsTextRole()) {
+ return FALSE;
+ }
+
+ return text->RemoveFromSelection(aSelectionNum);
+ }
+ if (RemoteAccessible* proxy = GetProxy(ATK_OBJECT(aText))) {
+ return proxy->RemoveFromSelection(aSelectionNum);
+ }
+
+ return FALSE;
+}
+
+static gboolean setTextSelectionCB(AtkText* aText, gint aSelectionNum,
+ gint aStartOffset, gint aEndOffset) {
+ Accessible* acc = GetInternalObj(ATK_OBJECT(aText));
+ if (!acc || !acc->IsTextRole()) {
+ return FALSE;
+ }
+ HyperTextAccessibleBase* text = acc->AsHyperTextBase();
+ if (!text) {
+ return FALSE;
+ }
+ return text->SetSelectionBoundsAt(aSelectionNum, aStartOffset, aEndOffset);
+}
+
+static gboolean setCaretOffsetCB(AtkText* aText, gint aOffset) {
+ Accessible* acc = GetInternalObj(ATK_OBJECT(aText));
+ if (!acc) {
+ return FALSE;
+ }
+
+ HyperTextAccessibleBase* text = acc->AsHyperTextBase();
+ if (!text || !acc->IsTextRole()) {
+ return FALSE;
+ }
+
+ text->SetCaretOffset(aOffset);
+ return TRUE;
+}
+
+static gboolean scrollSubstringToCB(AtkText* aText, gint aStartOffset,
+ gint aEndOffset, AtkScrollType aType) {
+ Accessible* acc = GetInternalObj(ATK_OBJECT(aText));
+ if (!acc) {
+ return FALSE;
+ }
+
+ HyperTextAccessibleBase* text = acc->AsHyperTextBase();
+ if (!text) {
+ return FALSE;
+ }
+
+ text->ScrollSubstringTo(aStartOffset, aEndOffset, aType);
+
+ return TRUE;
+}
+
+static gboolean scrollSubstringToPointCB(AtkText* aText, gint aStartOffset,
+ gint aEndOffset, AtkCoordType aCoords,
+ gint aX, gint aY) {
+ AtkObject* atkObject = ATK_OBJECT(aText);
+ AccessibleWrap* accWrap = GetAccessibleWrap(atkObject);
+ if (accWrap) {
+ HyperTextAccessible* text = accWrap->AsHyperText();
+ if (!text || !text->IsTextRole() ||
+ !text->IsValidRange(aStartOffset, aEndOffset)) {
+ return FALSE;
+ }
+ text->ScrollSubstringToPoint(aStartOffset, aEndOffset, aCoords, aX, aY);
+ return TRUE;
+ }
+
+ RemoteAccessible* proxy = GetProxy(atkObject);
+ if (proxy) {
+ proxy->ScrollSubstringToPoint(aStartOffset, aEndOffset, aCoords, aX, aY);
+ return TRUE;
+ }
+
+ return FALSE;
+}
+}
+
+void textInterfaceInitCB(AtkTextIface* aIface) {
+ NS_ASSERTION(aIface, "Invalid aIface");
+ if (MOZ_UNLIKELY(!aIface)) return;
+
+ aIface->get_text = getTextCB;
+ aIface->get_text_after_offset = getTextAfterOffsetCB;
+ aIface->get_text_at_offset = getTextAtOffsetCB;
+ aIface->get_character_at_offset = getCharacterAtOffsetCB;
+ aIface->get_text_before_offset = getTextBeforeOffsetCB;
+ aIface->get_caret_offset = getCaretOffsetCB;
+ aIface->get_run_attributes = getRunAttributesCB;
+ aIface->get_default_attributes = getDefaultAttributesCB;
+ aIface->get_character_extents = getCharacterExtentsCB;
+ aIface->get_range_extents = getRangeExtentsCB;
+ aIface->get_character_count = getCharacterCountCB;
+ aIface->get_offset_at_point = getOffsetAtPointCB;
+ aIface->get_n_selections = getTextSelectionCountCB;
+ aIface->get_selection = getTextSelectionCB;
+
+ // set methods
+ aIface->add_selection = addTextSelectionCB;
+ aIface->remove_selection = removeTextSelectionCB;
+ aIface->set_selection = setTextSelectionCB;
+ aIface->set_caret_offset = setCaretOffsetCB;
+
+ if (IsAtkVersionAtLeast(2, 32)) {
+ aIface->scroll_substring_to = scrollSubstringToCB;
+ aIface->scroll_substring_to_point = scrollSubstringToPointCB;
+ }
+
+ // Cache the string values of the atk text attribute names.
+ for (uint32_t i = 0; i < ArrayLength(sAtkTextAttrNames); i++) {
+ sAtkTextAttrNames[i] =
+ atk_text_attribute_get_name(static_cast<AtkTextAttribute>(i));
+ }
+}