GtkSourceView 3 Reference Manual: GtkSourceCompletionContext

## GtkSourceCompletionContext GtkSourceCompletionContext — The context of a completion |

## Synopsis

    #include <gtksourceview/gtksource.h>

    enum                GtkSourceCompletionActivation;
                        GtkSourceCompletionContext;
    void                gtk_source_completion_context_add_proposals
                                                            (GtkSourceCompletionContext *context,
                                                             GtkSourceCompletionProvider *provider,
                                                             GList *proposals,
                                                             gboolean finished);
    void                gtk_source_completion_context_get_iter
                                                            (GtkSourceCompletionContext *context,
                                                             GtkTextIter *iter);
    GtkSourceCompletionActivation gtk_source_completion_context_get_activation
                                                            (GtkSourceCompletionContext *context);

## Object Hierarchy

      GObject
       +----GInitiallyUnowned
             +----GtkSourceCompletionContext

## Properties

      "activation"               GtkSourceCompletionActivation  : Read / Write
      "completion"               GtkSourceCompletion*  : Read / Write / Construct Only
      "iter"                     GtkTextIter*          : Read / Write

## Signals

      "cancelled"                                      : Action

## Description

Initially, the completion window is hidden. For a completion to occur, it has to be activated. The different possible activations are listed in GtkSourceCompletionActivation. When an activation occurs, a GtkSourceCompletionContext object is created, and the eligible providers are asked to add proposals with `gtk_source_completion_context_add_proposals()`.

If no proposals are added, the completion window remains hidden, and the context is destroyed.

On the other hand, if proposals are added, the completion window becomes visible, and the user can choose a proposal. If the user is not happy with the shown proposals, he or she can insert or delete characters, to modify the completion context and therefore hoping to see the proposal he or she wants. This means that when an insertion or deletion occurs in the GtkTextBuffer when the completion window is visible, the eligible providers are again asked to add proposals. The "activation" remains the same in this case.

When the completion window is hidden, the interactive completion is triggered only on insertion in the buffer, not on deletion. Once the completion window is visible, then on each insertion or deletion, there is a new population and the providers are asked to add proposals. If there are no more proposals, the completion window disappears. So if you want to keep the completion window visible, but there are no proposals, you can insert a dummy proposal named "No proposals". For example, the user types progressively the name of a function, and some proposals appear. The user types a bad character and there are no proposals anymore. What the user wants is to delete the last character, and see the previous proposals. If the completion window disappears, the previous proposals will not reappear on the character deletion.

A GtkTextIter is associated with the context, this is where the completion takes place. With this GtkTextIter, you can get the associated GtkTextBuffer with `gtk_text_iter_get_buffer()`.

## Details

### enum GtkSourceCompletionActivation

    typedef enum {
    	GTK_SOURCE_COMPLETION_ACTIVATION_NONE = 0,
    	GTK_SOURCE_COMPLETION_ACTIVATION_INTERACTIVE = 1 << 0,
    	GTK_SOURCE_COMPLETION_ACTIVATION_USER_REQUESTED = 1 << 1
    } GtkSourceCompletionActivation;

`GTK_SOURCE_COMPLETION_ACTIVATION_NONE` | None.
`GTK_SOURCE_COMPLETION_ACTIVATION_INTERACTIVE` | Interactive activation. By default, it occurs on each insertion in the GtkTextBuffer. This can be blocked temporarily with `gtk_source_completion_block_interactive()`.
`GTK_SOURCE_COMPLETION_ACTIVATION_USER_REQUESTED` | User requested activation. By default, it occurs when the user presses Control+space.

### GtkSourceCompletionContext

    typedef struct _GtkSourceCompletionContext GtkSourceCompletionContext;

### gtk_source_completion_context_add_proposals ()

    void                gtk_source_completion_context_add_proposals
                                                            (GtkSourceCompletionContext *context,
                                                             GtkSourceCompletionProvider *provider,
                                                             GList *proposals,
                                                             gboolean finished);

Providers can use this function to add proposals to the completion. They can do so asynchronously by means of the `finished` argument. Providers must ensure that they always call this function with `finished` set to `TRUE` once each population (even if no proposals need to be added). Population occurs when the `gtk_source_completion_provider_populate()` function is called.

`context` : | a GtkSourceCompletionContext.
`provider` : | a GtkSourceCompletionProvider. [type GtkSource.CompletionProvider]
`proposals` : | The list of proposals to add. [allow-none][element-type GtkSource.CompletionProposal]
`finished` : | Whether the provider is finished adding proposals.

### gtk_source_completion_context_get_iter ()

    void                gtk_source_completion_context_get_iter
                                                            (GtkSourceCompletionContext *context,
                                                             GtkTextIter *iter);

Get the iter at which the completion was invoked. Providers can use this to determine how and if to match proposals.

`context` : | a GtkSourceCompletionContext.
`iter` : | a GtkTextIter. [out]

### gtk_source_completion_context_get_activation ()

    GtkSourceCompletionActivation gtk_source_completion_context_get_activation
                                                            (GtkSourceCompletionContext *context);

Get the context activation.

`context` : | a GtkSourceCompletionContext.
Returns : | The context activation.

## Property Details

### The `"activation"` property

      "activation"               GtkSourceCompletionActivation  : Read / Write

The completion activation

### The `"completion"` property

      "completion"               GtkSourceCompletion*  : Read / Write / Construct Only

The GtkSourceCompletion associated with the context.

### The `"iter"` property

      "iter"                     GtkTextIter*          : Read / Write

The GtkTextIter at which the completion is invoked.

## Signal Details

### The `"cancelled"` signal

    void                user_function                      (GtkSourceCompletionContext *arg0,
                                                            gpointer                    user_data)      : Action

Emitted when the current population of proposals has been cancelled. Providers adding proposals asynchronously should connect to this signal to know when to cancel running proposal queries.

`user_data` : | user data set when the signal handler was connected.