## GtkSourceView 3 -> 4 Porting Guide

## GTK+ dependency

Both GtkSourceView 3 and GtkSourceView 4 depend on GTK+ 3.

## Preparation in GtkSourceView 3

GtkSourceView 3.24 is the latest stable GtkSourceView 3 version. Before continuing this porting guide, you should use the 3.24 version without using any deprecated API.

## New pkg-config name

For GtkSourceView 4, the pkg-config name is: `gtksourceview-4`

To compile a program that uses GtkSourceView 4, you can for example use the following command:

`$ gcc hello.c `pkg-config --cflags --libs gtksourceview-4` -o hello`

## GtkSourceView 3.99.1

- All the deprecated APIs have been removed.

- Only `<gtksourceview/gtksource.h>` can be included directly. There were already warnings about it in GtkSourceView 3. The warnings have been changed to errors.

- Only the version 2 of the GtkSourceView language definition file format is supported (for *.lang files, used for syntax highlighting). The support for the version 1 has been dropped.

## GtkSourceView 3.99.2

- `gtk_source_completion_item_new2()` has been renamed to gtk_source_completion_item_new().

- `gtk_source_search_context_forward2()` has been renamed to gtk_source_search_context_forward().

- `gtk_source_search_context_forward_finish2()` has been renamed to gtk_source_search_context_forward_finish().

- `gtk_source_search_context_backward2()` has been renamed to gtk_source_search_context_backward().

- `gtk_source_search_context_backward_finish2()` has been renamed to gtk_source_search_context_backward_finish().

- `gtk_source_search_context_replace2()` has been renamed to gtk_source_search_context_replace().

- The GtkSourceSearchContext:settings property is now construct-only.

## GtkSourceView 3.99.3

No API changes.

## GtkSourceView 3.99.4

- The API of the GtkSourceView::move-lines keybinding signal has been simplified: the `copy` parameter was deprecated and has been removed; and the `count` parameter has been replaced by the `down` boolean.

## GtkSourceView 3.99.5 and 3.99.6

No API changes.

## GtkSourceView 3.99.7

In order to have a better *.gir file and have less metadata to generate the *.vapi for Vala, the following change has been made:

- `gtk_source_completion_show()` has been renamed to gtk_source_completion_start(). The function conflicted with the GtkSourceCompletion::show signal. Note that in Vala this doesn't require code changes because the method was already renamed to `start()` in GtkSourceView 3.

Other changes in 3.99.7:

- For i18n initialization, the gtk_source_init() function now needs to be called. There is also the gtk_source_finalize() function which is convenient when using memory debugging tools.