GtkFileChooser {RGtk2} | R Documentation

## GtkFileChooser

### Description

File chooser interface used by GtkFileChooserWidget and GtkFileChooserDialog

### Methods and Functions

`gtkFileChooserSetAction(object, action)`
`gtkFileChooserGetAction(object)`
`gtkFileChooserSetLocalOnly(object, local.only)`
`gtkFileChooserGetLocalOnly(object)`
`gtkFileChooserSetSelectMultiple(object, select.multiple)`
`gtkFileChooserGetSelectMultiple(object)`
`gtkFileChooserSetShowHidden(object, show.hidden)`
`gtkFileChooserGetShowHidden(object)`
`gtkFileChooserSetDoOverwriteConfirmation(object, do.overwrite.confirmation)`
`gtkFileChooserGetDoOverwriteConfirmation(object)`
`gtkFileChooserSetCreateFolders(object, create.folders)`
`gtkFileChooserGetCreateFolders(object)`
`gtkFileChooserSetCurrentName(object, name)`
`gtkFileChooserSelectAll(object)`
`gtkFileChooserUnselectAll(object)`
`gtkFileChooserGetUri(object)`
`gtkFileChooserSetUri(object, uri)`
`gtkFileChooserSelectUri(object, uri)`
`gtkFileChooserUnselectUri(object, uri)`
`gtkFileChooserGetUris(object)`
`gtkFileChooserSetCurrentFolderUri(object, uri)`
`gtkFileChooserGetCurrentFolderUri(object)`
`gtkFileChooserSetPreviewWidget(object, preview.widget)`
`gtkFileChooserGetPreviewWidget(object)`
`gtkFileChooserSetPreviewWidgetActive(object, active)`
`gtkFileChooserGetPreviewWidgetActive(object)`
`gtkFileChooserSetUsePreviewLabel(object, use.label)`
`gtkFileChooserGetUsePreviewLabel(object)`
`gtkFileChooserGetPreviewUri(object)`
`gtkFileChooserSetExtraWidget(object, extra.widget)`
`gtkFileChooserGetExtraWidget(object)`
`gtkFileChooserAddFilter(object, filter)`
`gtkFileChooserRemoveFilter(object, filter)`
`gtkFileChooserListFilters(object)`
`gtkFileChooserSetFilter(object, filter)`
`gtkFileChooserGetFilter(object)`
`gtkFileChooserAddShortcutFolderUri(object, uri, .errwarn = TRUE)`
`gtkFileChooserRemoveShortcutFolderUri(object, uri, .errwarn = TRUE)`
`gtkFileChooserListShortcutFolderUris(object)`
`gtkFileChooserGetCurrentFolderFile(object)`
`gtkFileChooserGetFile(object)`
`gtkFileChooserGetFiles(object)`
`gtkFileChooserGetPreviewFile(object)`
`gtkFileChooserSelectFile(object, file, .errwarn = TRUE)`
`gtkFileChooserSetCurrentFolderFile(object, file, .errwarn = TRUE)`
`gtkFileChooserSetFile(object, file, .errwarn = TRUE)`
`gtkFileChooserUnselectFile(object, file)`

### Hierarchy

    GInterface
       +----GtkFileChooser

### Implementations

GtkFileChooser is implemented by `GtkFileChooserButton`, `GtkFileChooserDialog` and `GtkFileChooserWidget`.

### Detailed Description

`GtkFileChooser` is an interface that can be implemented by file selection widgets. In GTK+, the main objects that implement this interface are `GtkFileChooserWidget`, `GtkFileChooserDialog`, and `GtkFileChooserButton`. You do not need to write an object that implements the `GtkFileChooser` interface unless you are trying to adapt an existing file selector to expose a standard programming interface. `GtkFileChooser` allows for shortcuts to various places in the filesystem. In the default implementation these are displayed in the left pane. It may be a bit confusing at first that these shortcuts come from various sources and in various flavours, so lets explain the terminology here:

Bookmarks

  undocumented

Shortcuts

  undocumented

Volumes

  undocumented

File Names and Encodings When the user is finished selecting files in a `GtkFileChooser`, your program can get the selected names either as filenames or as URIs. For URIs, the normal escaping rules are applied if the URI contains non-ASCII characters. However, filenames are always returned in the character set specified by the G_FILENAME_ENCODING environment variable. Please see the Glib documentation for more details about this variable. PLEASE NOTE: This means that while you can pass the result of `gtkFileChooserGetFilename` to `open(2)` or `fopen(3)` , you may not be able to directly set it as the text of a `GtkLabel` widget unless you convert it first to UTF-8, which all GTK+ widgets expect. You should use `gFilenameToUtf8()` to convert filenames into strings that can be passed to GTK+ widgets.

Adding a Preview Widget You can add a custom preview widget to a file chooser and then get notification about when the preview needs to be updated. To install a preview widget, use `gtkFileChooserSetPreviewWidget`. Then, connect to the `"update-preview"` signal to get notified when you need to update the contents of the preview.

Your callback should use `gtkFileChooserGetPreviewFilename` to see what needs previewing. Once you have generated the preview for the corresponding file, you must call `gtkFileChooserSetPreviewWidgetActive` with a boolean flag that indicates whether your callback could successfully generate a preview.

Sample Usage

    update_preview_cb <- function(file_chooser, preview)
    {
      filename <- file_chooser$getPreviewFilename()

      pixbuf <- gdkPixbuf(file=filename, w=128, h=128)[[1]]
      have_preview <- !is.null(pixbuf)

      preview$setFromPixbuf(pixbuf)

      file_chooser$setPreviewWidgetActive(have_preview)
    }

    preview <- gtkImage()
    my_file_chooser$setPreviewWidget(preview)
    gSignalConnect(my_file_chooser, "update-preview", update_preview_cb, preview)

Adding Extra Widgets You can add extra widgets to a file chooser to provide options that are not present in the default design. For example, you can add a toggle button to give the user the option to open a file in read-only mode. You can use `gtkFileChooserSetExtraWidget` to insert additional widgets in a file chooser.

Sample Usage

    toggle <- gtkCheckButton("Open file read-only")
    my_file_chooser$setExtraWidget(toggle)

PLEASE NOTE: If you want to set more than one extra widget in the file chooser, you can a container such as a `GtkVBox` or a `GtkTable` and include your widgets in it. Then, set the container as the whole extra widget. Key Bindings Internally, GTK+ implements a file chooser's graphical user interface with the private `GtkFileChooserDefaultClass`. This widget has several key bindings and their associated signals. This section describes the available key binding signals.

GtkFileChooser key binding example The default keys that activate the key-binding signals in `GtkFileChooserDefaultClass` are as follows:

Signal name | Default key combinations
location-popup | `Control`-`L` (empty path); `/` (path of "/") PLEASE NOTE: Both the individual `/` key and the numeric keypad's "divide" key are supported. ; `~` (path of "~")
up-folder | `Alt`-`Up` PLEASE NOTE: Both the individual Up key and the numeric keypad's Up key are supported. ; `Backspace`
down-folder | `Alt`-`Down`
home-folder | `Alt`-`Home`
desktop-folder | `Alt`-`D`
quick-bookmark | `Alt`-`1` through `Alt`-`0`

You can change these defaults to something else. For example, to add a `Shift` modifier to a few of the default bindings, you can include the following fragment in your ‘.gtkrc-2.0’ file:

    binding "my-own-gtkfilechooser-bindings" {
    	bind "<Alt><Shift>Up" {
    		"up-folder" ()
    	}
    	bind "<Alt><Shift>Down" {
    		"down-folder" ()
    	}
    	bind "<Alt><Shift>Home" {
    		"home-folder" ()
    	}
    }

    class "GtkFileChooserDefault" binding "my-own-gtkfilechooser-bindings"

The "GtkFileChooserDefault::location-popup" signal

       void user_function (GtkFileChooserDefault *chooser,
                           const char            *path,
      gpointer        user_data);

This is used to make the file chooser show a "Location" dialog which the user can use to manually type the name of the file he wishes to select. The `path` argument is a string that gets put in the text entry for the file name. By default this is bound to `Control`-`L` with a `path` string of "" (the empty string). It is also bound to `/` with a `path` string of "`/`" (a slash): this lets you type `/` and immediately type a path name. On Unix systems, this is bound to `~` (tilde) with a `path` string of "~" itself for access to home directories.

`chooser` :

  the object which received the signal.

`path` :

  default contents for the text entry for the file name

`user.data` :

  user data set when the signal handler was connected.

PLEASE NOTE: You can create your own bindings for the GtkFileChooserDefault::location-popup signal with custom `path` strings, and have a crude form of easily-to-type bookmarks. For example, say you access the path ‘/home/username/misc’ very frequently. You could then create an `Alt`-`M` shortcut by including the following in your ‘.gtkrc-2.0’ :

       binding "misc-shortcut" {
          bind "<Alt>M" {
             "location-popup" ("/home/username/misc")
    	 }
       }

       class "GtkFileChooserDefault" binding "misc-shortcut"

The "GtkFileChooserDefault::up-folder" signal

              void user_function (GtkFileChooserDefault *chooser,
                                    gpointer   user_data);

This is used to make the file chooser go to the parent of the current folder in the file hierarchy. By default this is bound to `Backspace` and `Alt`-`Up` (the Up key in the numeric keypad also works).

`chooser` :

  the object which received the signal.

`user.data` :

  user data set when the signal handler was connected.

The "GtkFileChooserDefault::down-folder" signal

              void user_function (GtkFileChooserDefault *chooser,
                                    gpointer   user_data);

This is used to make the file chooser go to a child of the current folder in the file hierarchy. The subfolder that will be used is displayed in the path bar widget of the file chooser. For example, if the path bar is showing "/foo/bar/baz", then this will cause the file chooser to switch to the "baz" subfolder. By default this is bound to `Alt`-`Down` (the Down key in the numeric keypad also works).

`chooser` :

  the object which received the signal.

`user.data` :

  user data set when the signal handler was connected.

The "GtkFileChooserDefault::home-folder" signal

              void user_function (GtkFileChooserDefault *chooser,
                                    gpointer   user_data);

This is used to make the file chooser show the user's home folder in the file list. By default this is bound to `Alt`-`Home` (the Home key in the numeric keypad also works).

`chooser` :

  the object which received the signal.

`user.data` :

  user data set when the signal handler was connected.

The "GtkFileChooserDefault::desktop-folder" signal

              void user_function (GtkFileChooserDefault *chooser,
                                    gpointer   user_data);

This is used to make the file chooser show the user's Desktop folder in the file list. By default this is bound to `Alt`-`D`.

`chooser` :

  the object which received the signal.

`user.data` :

  user data set when the signal handler was connected.

The "GtkFileChooserDefault::quick-bookmark" signal

              void user_function (GtkFileChooserDefault *chooser,
                                  gint bookmark_index,
                                    gpointer   user_data);

This is used to make the file chooser switch to the bookmark specified in the `bookmark.index` parameter. For example, if you have three bookmarks, you can pass 0, 1, 2 to this signal to switch to each of them, respectively. By default this is bound to `Alt`-`1`, `Alt`-`2`, etc. until `Alt`-`0`. Note that in the default binding, that `Alt`-`1` is actually defined to switch to the bookmark at index 0, and so on successively; `Alt`-`0` is defined to switch to the bookmark at index 10.

`chooser` :

  the object which received the signal.

`bookmark.indes` :

  index of the bookmark to switch to; the indices start at 0.

`user.data` :

  user data set when the signal handler was connected.

### Structures

`GtkFileChooser`

  undocumented

### Enums and Flags

`GtkFileChooserAction`

  Describes whether a `GtkFileChooser` is being used to open existing files or to save to a possibly new file.

  `open`

    Indicates open mode. The file chooser will only let the user pick an existing file.

  `save`

    Indicates save mode. The file chooser will let the user pick an existing file, or type in a new filename.

  `select-folder`

    Indicates an Open mode for selecting folders. The file chooser will let the user pick an existing folder.

  `create-folder`

    Indicates a mode for creating a new folder. The file chooser will let the user name an existing or new folder.

`GtkFileChooserConfirmation`

  Used as a return value of handlers for the `"confirm-overwrite"` signal of a `GtkFileChooser`. This value determines whether the file chooser will present the stock confirmation dialog, accept the user's choice of a filename, or let the user choose another filename. Since 2.8

  `confirm`

    The file chooser will present its stock dialog to confirm about overwriting an existing file.

  `accept-filename`

    The file chooser will terminate and accept the user's choice of a file name.

  `select-again`

    The file chooser will continue running, so as to let the user select another file name.

`GtkFileChooserError`

  These identify the various errors that can occur while calling `GtkFileChooser` functions.

  `nonexistent`

    Indicates that a file does not exist.

  `bad-filename`

    Indicates a malformed filename.

### Signals

`confirm-overwrite(chooser, user.data)`

  This signal gets emitted whenever it is appropriate to present a confirmation dialog when the user has selected a file name that already exists. The signal only gets emitted when the file chooser is in `GTK_FILE_CHOOSER_ACTION_SAVE` mode.

  Most applications just need to turn on the `"do-overwrite-confirmation"` property (or call the `gtkFileChooserSetDoOverwriteConfirmation` function), and they will automatically get a stock confirmation dialog. Applications which need to customize this behavior should do that, and also connect to the `"confirm-overwrite"` signal.

  A signal handler for this signal must return a `GtkFileChooserConfirmation` value, which indicates the action to take. If the handler determines that the user wants to select a different filename, it should return `GTK_FILE_CHOOSER_CONFIRMATION_SELECT_AGAIN`. If it determines that the user is satisfied with his choice of file name, it should return `GTK_FILE_CHOOSER_CONFIRMATION_ACCEPT_FILENAME`. On the other hand, if it determines that the stock confirmation dialog should be used, it should return `GTK_FILE_CHOOSER_CONFIRMATION_CONFIRM`. The following example illustrates this.

  Custom confirmation

      static GtkFileChooserConfirmation
      confirm_overwrite_callback (GtkFileChooser *chooser, gpointer data)
      {
        char *uri;

        uri = gtk_file_chooser_get_uri (chooser);

        if (is_uri_read_only (uri))
          {
            if (user_wants_to_replace_read_only_file (uri))
              return GTK_FILE_CHOOSER_CONFIRMATION_ACCEPT_FILENAME;
            else
              return GTK_FILE_CHOOSER_CONFIRMATION_SELECT_AGAIN;
          } else
            return GTK_FILE_CHOOSER_CONFIRMATION_CONFIRM; // fall back to the default dialog
      }

      ...

      chooser = gtk_file_chooser_dialog_new (...);

      gtk_file_chooser_set_do_overwrite_confirmation (GTK_FILE_CHOOSER (dialog), TRUE);
      g_signal_connect (chooser, "confirm-overwrite",
                        G_CALLBACK (confirm_overwrite_callback), NULL);

      if (gtk_dialog_run (chooser) == GTK_RESPONSE_ACCEPT)
              save_to_file (gtk_file_chooser_get_filename (GTK_FILE_CHOOSER (chooser));

      gtk_widget_destroy (chooser);

  Since 2.8

  `chooser`

    the object which received the signal.

  `user.data`

    user data set when the signal handler was connected.

  Returns: [`GtkFileChooserConfirmation`] a `GtkFileChooserConfirmation` value that indicates which action to take after emitting the signal.

`current-folder-changed(chooser, user.data)`

  This signal is emitted when the current folder in a `GtkFileChooser` changes. This can happen due to the user performing some action that changes folders, such as selecting a bookmark or visiting a folder on the file list. It can also happen as a result of calling a function to explicitly change the current folder in a file chooser.

  Normally you do not need to connect to this signal, unless you need to keep track of which folder a file chooser is showing.

  See also: `gtkFileChooserSetCurrentFolder`, `gtkFileChooserGetCurrentFolder`, `gtkFileChooserSetCurrentFolderUri`, `gtkFileChooserGetCurrentFolderUri`.

  `chooser`

    the object which received the signal.

  `user.data`

    user data set when the signal handler was connected.

`file-activated(chooser, user.data)`

  This signal is emitted when the user "activates" a file in the file chooser. This can happen by double-clicking on a file in the file list, or by pressing `Enter`.

  Normally you do not need to connect to this signal. It is used internally by `GtkFileChooserDialog` to know when to activate the default button in the dialog.

  See also: `gtkFileChooserGetFilename`, `gtkFileChooserGetFilenames`, `gtkFileChooserGetUri`, `gtkFileChooserGetUris`.

  `chooser`

    the object which received the signal.

  `user.data`

    user data set when the signal handler was connected.

`selection-changed(chooser, user.data)`

  This signal is emitted when there is a change in the set of selected files in a `GtkFileChooser`. This can happen when the user modifies the selection with the mouse or the keyboard, or when explicitly calling functions to change the selection.

  Normally you do not need to connect to this signal, as it is easier to wait for the file chooser to finish running, and then to get the list of selected files using the functions mentioned below.

  See also: `gtkFileChooserSelectFilename`, `gtkFileChooserUnselectFilename`, `gtkFileChooserGetFilename`, `gtkFileChooserGetFilenames`, `gtkFileChooserSelectUri`, `gtkFileChooserUnselectUri`, `gtkFileChooserGetUri`, `gtkFileChooserGetUris`.

  `chooser`

    the object which received the signal.

  `user.data`

    user data set when the signal handler was connected.

`update-preview(chooser, user.data)`

  This signal is emitted when the preview in a file chooser should be regenerated. For example, this can happen when the currently selected file changes. You should use this signal if you want your file chooser to have a preview widget.

  Once you have installed a preview widget with `gtkFileChooserSetPreviewWidget`, you should update it when this signal is emitted. You can use the functions `gtkFileChooserGetPreviewFilename` or `gtkFileChooserGetPreviewUri` to get the name of the file to preview. Your widget may not be able to preview all kinds of files; your callback must call `gtkFileChooserSetPreviewWidgetActive` to inform the file chooser about whether the preview was generated successfully or not.

  Please see the example code in .

  See also: `gtkFileChooserSetPreviewWidget`, `gtkFileChooserSetPreviewWidgetActive`, `gtkFileChooserSetUsePreviewLabel`, `gtkFileChooserGetPreviewFilename`, `gtkFileChooserGetPreviewUri`.

  `chooser`

    the object which received the signal.

  `user.data`

    user data set when the signal handler was connected.

### Properties

`action` [`GtkFileChooserAction` : Read / Write]

  The type of operation that the file selector is performing. Default value: GTK_FILE_CHOOSER_ACTION_OPEN

`create-folders` [logical : Read / Write]

  Whether a file chooser not in `GTK_FILE_CHOOSER_ACTION_OPEN` mode will offer the user to create new folders. Default value: TRUE Since 2.18

`do-overwrite-confirmation` [logical : Read / Write]

  Whether a file chooser in `GTK_FILE_CHOOSER_ACTION_SAVE` mode will present an overwrite confirmation dialog if the user selects a file name that already exists. Default value: FALSE Since 2.8

`extra-widget` [`GtkWidget` : * : Read / Write]

  Application supplied widget for extra options.

`file-system-backend` [character : * : Write / Construct Only]

  Name of file system backend to use. Default value: NULL

`filter` [`GtkFileFilter` : * : Read / Write]

  The current filter for selecting which files are displayed.

`local-only` [logical : Read / Write]

  Whether the selected file(s) should be limited to local file: URLs. Default value: TRUE

`preview-widget` [`GtkWidget` : * : Read / Write]

  Application supplied widget for custom previews.

`preview-widget-active` [logical : Read / Write]

  Whether the application supplied widget for custom previews should be shown. Default value: TRUE

`select-multiple` [logical : Read / Write]

  Whether to allow multiple files to be selected. Default value: FALSE

`show-hidden` [logical : Read / Write]

  Whether the hidden files and folders should be displayed. Default value: FALSE

`use-preview-label` [logical : Read / Write]

  Whether to display a stock label with the name of the previewed file. Default value: TRUE

### Author(s)

Derived by RGtkGen from GTK+ documentation

### References

https://developer.gnome.org/gtk2/stable/GtkFileChooser.html

[Package RGtk2 version 2.20.36.3 Index]