Implement AtkComponent interface for chrome UI.

ui/accessibility/platform/ax_platform_node_auralinux.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/accessibility/platform/ax_platform_node_auralinux.h"
 
 #include "base/command_line.h"
 #include "base/strings/sys_string_conversions.h"
 #include "ui/accessibility/ax_node_data.h"
 #include "ui/accessibility/platform/atk_util_auralinux.h"
@@ skipping 374 matching lines @@
   return atk_object_;
 }
 
 void AXPlatformNodeAuraLinux::NotifyAccessibilityEvent(ui::AXEvent event_type) {
 }
 
 int AXPlatformNodeAuraLinux::GetIndexInParent() {
   return 0;
 }
 
+//
+// ax_platform_node_auralinux AtkComponent interface implementation.
+//
+
+static void ax_component_interface_get_extents(AtkComponent* atk_component,
+                                               gint* x, gint* y,
+                                               gint* width, gint* height,
+                                               AtkCoordType coord_type) {
+  *x = *y = *width = *height = 0;
+  AtkObject* atk_object = ATK_OBJECT(atk_component);
+  ui::AXPlatformNodeAuraLinux* obj =
+      AtkObjectToAXPlatformNodeAuraLinux(atk_object);
+  if (!obj)
+    return;
+
+  obj->GetExtents(x, y, width, height, coord_type);
+}
+
+static void ax_component_interface_get_position(AtkComponent* atk_component,
+                                                gint* x, gint* y,
+                                                AtkCoordType coord_type) {
+  *x = *y = 0;
+  AtkObject* atk_object = ATK_OBJECT(atk_component);
+  ui::AXPlatformNodeAuraLinux* obj =
+      AtkObjectToAXPlatformNodeAuraLinux(atk_object);
+  if (!obj)
+    return;
+
+  obj->GetPosition(x, y, coord_type);
+}
+
+static void ax_component_interface_get_size(AtkComponent* atk_component,
+                                            gint* width, gint* height) {
+  *width = *height = 0;
+  AtkObject* atk_object = ATK_OBJECT(atk_component);
+  ui::AXPlatformNodeAuraLinux* obj =
+      AtkObjectToAXPlatformNodeAuraLinux(atk_object);
+  if (!obj)
+    return;
+
+  obj->GetSize(width, height);
+}
+
+void ax_component_interface_base_init(AtkComponentIface* iface) {
+    iface->get_extents = ax_component_interface_get_extents;
+    iface->get_position = ax_component_interface_get_position;
+    iface->get_size = ax_component_interface_get_size;
+}
+
+GType ax_component_auralinux_get_type() {
+  static volatile gsize type_volatile = 0;
+
+  if (g_once_init_enter(&type_volatile)) {
+    static const GTypeInfo tinfo = {
+      sizeof(AtkComponentIface),
+      (GBaseInitFunc) ax_component_interface_base_init,
+      (GBaseFinalizeFunc) 0,
+    };
+
+    GType type = g_type_register_static(
+        ATK_TYPE_COMPONENT, "AtkComponent", &tinfo, GTypeFlags(0));
+    g_once_init_leave(&type_volatile, type);
+  }
+
+  return type_volatile;
+}
+
+void AXPlatformNodeAuraLinux::GetExtents(gint* x, gint* y,
+                                         gint* width, gint* height,
+                                         AtkCoordType coord_type) {
+  gfx::Rect extents = GetBoundsInScreen();
+
+  if (coord_type == ATK_XY_WINDOW) {
+    // Not able to find any api to get screen coords for window

[shreeramk, 2015/03/26 05:25:15]

Need some input here.

[dmazzoni, 2015/03/26 15:44:47]

Keep taking the parent of this object until you reach one that has a role of
"window". Take the upper-left corner of that window object and subtract it from
the coordinates of this object, and now you have window-relative coordinates.

+  }
+
+  *x = extents.x();
+  *y = extents.y();
+  *width = extents.width();
+  *height = extents.height();
+}
+
+void AXPlatformNodeAuraLinux::GetPosition(gint* x, gint* y,
+                                          AtkCoordType coord_type) {
+  gfx::Rect rect_pos = GetBoundsInScreen();
+
+  if (coord_type == ATK_XY_WINDOW) {
+    // Not able to find any api to get screen coords for window
+  }
+
+  *x = rect_pos.x();
+  *y = rect_pos.y();
+}
+
+void AXPlatformNodeAuraLinux::GetSize(gint* width, gint* height) {
+  gfx::Rect rect_size = GetData().location;
+  *width = rect_size.width();
+  *height = rect_size.height();
+}
+
 }  // namespace ui