ATK Implementation for a Specific Object

所有 GObject 均要实现一个 get_type() 函数。使用上面的命名惯例将函数命名为 myatkimp_mytype_get_type()

In this function, you specify which interfaces your object implements. If the following logic were included in this get_type() function, this object would implement the ATK_TEXT interface:

Example 1-5 get_type() 函数示例
static const GInterfaceInfo atk_text_info = 
{ 
   (GInterfaceInitFunc) atk_text_interface_init, 
   (GInterfaceFinalizeFunc) NULL, 
   NULL 
}; 

g_type_add_interface_static (type, ATK_TYPE_TEXT, 
                             &atk_text_info); 

函数 atk_text_interface_init() 需要实现的函数原型如下:

void atk_text_interface_init (AtkTextIface *iface); 

This function would connect the interface function calls to the specific implementation as follows:

Example 1-6连接自定义接口与一个 AtkObject 实现
void 
atk_text_interface_init (AtkTextIface *iface) 
{ 
   g_return_if_fail (iface != NULL); 
   iface->get_text = myatkimp_mytype_get_text; 
   iface->get_character_at_offset = myatkimp_mytype_get_character_at_offset; 
   ... 
}

Then the functions myatkimp_mytype_get_text(), myatkimp_mytype_get_character_at_offset(), and the rest of the ATK_TEXT interface functions would need to be implemented.