GTK+ uses caches for GtkStyles and GdkGCs. These consume a lot of resources, so a GCache is used to see if a GtkStyle or GdkGC with the required properties already exists. If it does, then the existing object is used instead of creating a new one. GCache uses keys and values. A GCache key describes the properties of a particular resource. A GCache value is the actual resource.
Public Member Functions
|GCache *||getCacheStruct ()|
|this (GCache *gCache)|
|Sets our main struct and passes it to the parent class. |
|this (GCacheNewFunc valueNewFunc, GCacheDestroyFunc valueDestroyFunc, GCacheDupFunc keyDupFunc, GCacheDestroyFunc keyDestroyFunc, GHashFunc hashKeyFunc, GHashFunc hashValueFunc, GEqualFunc keyEqualFunc)|
|Creates a new GCache. |
|void *||insert (void *key)|
|Gets the value corresponding to the given key, creating it if necessary. |
|void||remove (void *value)|
|Decreases the reference count of the given value. |
|Frees the memory allocated for the GCache. |
|void||keyForeach (GHFunc func, void *userData)|
|Calls the given function for each of the keys in the GCache. |
|void||valueForeach (GHFunc func, void *userData)|
|Warning g_cache_value_foreach has been deprecated since version 2.10 and should not be used in newly-written code. |
Protected Member Functions
|void *||getStruct ()|
|the main Gtk struct as a void* |
|the main Gtk struct |
Sets our main struct and passes it to the parent class.
Creates a new GCache.
value_new_func: a function to create a new object given a key. This is called by g_cache_insert() if an object with the given key does not already exist. value_destroy_func: a function to destroy an object. It is called by g_cache_remove() when the object is no longer needed (i.e. its reference count drops to 0). key_dup_func: a function to copy a key. It is called by g_cache_insert() if the key does not already exist in the GCache. key_destroy_func: a function to destroy a key. It is called by g_cache_remove() when the object is no longer needed (i.e. its reference count drops to 0). hash_key_func: a function to create a hash value from a key. hash_value_func: a function to create a hash value from a value. key_equal_func: a function to compare two keys. It should return TRUE if the two keys are equivalent. Returns: a new GCache.
Frees the memory allocated for the GCache.
Note that it does not destroy the keys and values which were contained in the GCache. cache: a GCache.
the main Gtk struct as a void*
|void* glib.Cache.Cache.insert||(||void *||key||)|
Gets the value corresponding to the given key, creating it if necessary.
It first checks if the value already exists in the GCache, by using the key_equal_func function passed to g_cache_new(). If it does already exist it is returned, and its reference count is increased by one. If the value does not currently exist, if is created by calling the value_new_func. The key is duplicated by calling key_dup_func and the duplicated key and value are inserted into the GCache. cache: a GCache. key: a key describing a GCache object. Returns: a pointer to a GCache value.
Calls the given function for each of the keys in the GCache.
Note func is passed three parameters, the value and key of a cache entry and the user_data. The order of value and key is different from the order in which g_hash_table_foreach() passes key-value pairs to its callback function ! cache: a GCache. func: the function to call with each GCache key. user_data: user data to pass to the function.
|void glib.Cache.Cache.remove||(||void *||value||)|
Decreases the reference count of the given value.
If it drops to 0 then the value and its corresponding key are destroyed, using the value_destroy_func and key_destroy_func passed to g_cache_new(). cache: a GCache. value: the value to remove.
Warning g_cache_value_foreach has been deprecated since version 2.10 and should not be used in newly-written code.
The reason is that it passes pointers to internal data structures to func; use g_cache_key_foreach() instead Calls the given function for each of the values in the GCache. cache: a GCache. func: the function to call with each GCache value. user_data: user data to pass to the function.