## EClientComboBox

EClientComboBox — Combo box of EClient instances

## Functions

GtkWidget * | e_client_combo_box_new ()
EClientCache * | e_client_combo_box_ref_client_cache ()
void | e_client_combo_box_set_client_cache ()
EClient * | e_client_combo_box_get_client_sync ()
void | e_client_combo_box_get_client ()
EClient * | e_client_combo_box_get_client_finish ()
EClient * | e_client_combo_box_ref_cached_client ()

## Properties

EClientCache * | client-cache | Read / Write / Construct Only

## Object Hierarchy

        GObject
        ╰── GInitiallyUnowned
            ╰── GtkWidget
                ╰── GtkContainer
                    ╰── GtkBin
                        ╰── GtkComboBox
                            ╰── ESourceComboBox
                                ╰── EClientComboBox

## Includes

    #include <e-util/e-util.h>

## Description

EClientComboBox extends the functionality of ESourceComboBox by providing convenient access to EClient instances with EClientCache.

As a future enhancement, this widget may also display status information about the backends associated with the displayed data sources, similar to EClientSelector.

## Functions

### e_client_combo_box_new ()

    GtkWidget *
    e_client_combo_box_new (EClientCache *client_cache,
                            const gchar *extension_name);

Creates a new EClientComboBox widget that lets the user pick an ESource from the provided `client_cache` . The displayed sources are restricted to those which have an `extension_name` extension.

#### Parameters

client_cache | an EClientCache |
extension_name | the name of an ESource extension |

#### Returns

a new EClientComboBox

### e_client_combo_box_ref_client_cache ()

    EClientCache *
    e_client_combo_box_ref_client_cache (EClientComboBox *combo_box);

Returns the EClientCache passed to `e_client_combo_box_new()`.

The returned EClientCache is referenced for thread-safety and must be unreferenced with `g_object_unref()` when finished with it.

#### Parameters

combo_box | an EClientComboBox |

#### Returns

an EClientCache

### e_client_combo_box_set_client_cache ()

    void
    e_client_combo_box_set_client_cache (EClientComboBox *combo_box,
                                         EClientCache *client_cache);

Simultaneously sets the “client-cache” and “registry” properties.

This function is intended for cases where `combo_box` is instantiated by a GtkBuilder and has to be given an EClientCache after it is fully constructed.

#### Parameters

combo_box | an EClientComboBox |

### e_client_combo_box_get_client_sync ()

    EClient *
    e_client_combo_box_get_client_sync (EClientComboBox *combo_box,
                                        ESource *source,
                                        GCancellable *cancellable,
                                        GError **error);

Obtains a shared EClient instance for `source` , or else creates a new EClient instance to be shared.

The “extension-name” property determines the type of EClient to obtain. See `e_client_cache_get_client_sync()` for a list of valid extension names.

If a request for the same `source` and “extension-name” is already in progress when this function is called, this request will "piggyback" on the in-progress request such that they will both succeed or fail simultaneously.

Unreference the returned EClient with `g_object_unref()` when finished with it. If an error occurs, the function will set `error` and return `NULL`.

#### Parameters

combo_box | an EClientComboBox |
source | an ESource |
cancellable | optional GCancellable object, or `NULL` |
error | return location for a GError, or `NULL` |

#### Returns

an EClient, or `NULL`

### e_client_combo_box_get_client ()

    void
    e_client_combo_box_get_client (EClientComboBox *combo_box,
                                   ESource *source,
                                   GCancellable *cancellable,
                                   GAsyncReadyCallback callback,
                                   gpointer user_data);

Asynchronously obtains a shared EClient instance for `source` , or else creates a new EClient instance to be shared.

The “extension-name” property determines the type of EClient to obtain. See `e_client_cache_get_client_sync()` for a list of valid extension names.

If a request for the same `source` and “extension-name” is already in progress when this function is called, this request will "piggyback" on the in-progress request such that they will both succeed or fail simultaneously.

When the operation is finished, `callback` will be called. You can then call `e_client_combo_box_get_client_finish()` to get the result of the operation.

#### Parameters

combo_box | an EClientComboBox |
source | an ESource |
cancellable | optional GCancellable object, or `NULL` |
callback | a GAsyncReadyCallback to call when the request is satisfied |
user_data | data to pass to the callback function |

### e_client_combo_box_get_client_finish ()

    EClient *
    e_client_combo_box_get_client_finish (EClientComboBox *combo_box,
                                          GAsyncResult *result,
                                          GError **error);

Finishes the operation started with `e_client_combo_box_get_client()`.

Unreference the returned EClient with `g_object_unref()` when finished with it. If an error occurred, the function will set `error` and return `NULL`.

#### Parameters

combo_box | an EClientComboBox |
result | a GAsyncResult |
error | return location for a GError, or `NULL` |

#### Returns

an EClient, or `NULL`

### e_client_combo_box_ref_cached_client ()

    EClient *
    e_client_combo_box_ref_cached_client (EClientComboBox *combo_box,
                                          ESource *source);

Returns a shared EClient instance for `source` and the value of “extension-name” if such an instance is already cached, or else `NULL`. This function does not create a new EClient instance, and therefore does not block.

The returned EClient is referenced for thread-safety and must be unreferenced with `g_object_unref()` when finished with it.

#### Parameters

combo_box | an EClientComboBox |
source | an ESource |

#### Returns

an EClient, or `NULL`

## Property Details

### The `“client-cache”` property

      “client-cache”             EClientCache *

Cache of shared EClient instances.

Owner: EClientComboBox

Flags: Read / Write / Construct Only