NAME

AG_DirDlg —

agar directory browser widget

SYNOPSIS

#include <agar/core.h>
#include <agar/gui.h>

DESCRIPTION

The AG_DirDlg widget is a directory selection widget. It provides an interface similar to AG_FileDlg(3), but restricts the selection to directories.

INHERITANCE HIERARCHY

AG_Object(3) -> AG_Widget(3) -> AG_DirDlg.

INITIALIZATION

AG_DirDlg *
AG_DirDlgNew(AG_Widget *parent, Uint flags);

AG_DirDlg *
AG_DirDlgNewMRU(AG_Widget *parent, const char *mruKey, Uint flags);

int
AG_DirDlgSetDirectory(AG_DirDlg *dd, const char *format, ...);

int
AG_DirDlgSetDirectoryS(AG_DirDlg *dd, const char *path);

void
AG_DirDlgSetDirectoryMRU(AG_DirDlg *dd, const char *mruKey, const char *defaultDir);

The AG_DirDlgNew() function allocates, initializes, and attaches a new AG_DirDlg widget. The AG_DirDlgNewMRU() variant implicitely calls AG_DirDlgSetDirectoryMRU() with the given key. Note that unless AG_DirDlgSetDirectory() is used (see below), the default directory is set according to the AG_Config(3) ‘save-path’ parameter.

Acceptable flags include:

AG_DIRDLG_MULTI: Allow multiple directories to be selected at once.
AG_DIRDLG_CLOSEWIN: Automatically close the AG_DirDlg widget's parent window when a directory is selected.
AG_DIRDLG_LOAD: The selected directory must exist and be accessible or an error is returned to the user.
AG_DIRDLG_SAVE: The selected directory must be writeable or an error is returned to the user.
AG_DIRDLG_ASYNC: Load/save routines will be executed in a separate thread. This flag is available only if agar was compiled with threads support.
AG_DIRDLG_NOBUTTONS: Don't display "OK" and "Cancel" buttons.
AG_DIRDLG_HFILL: Expand horizontally in parent (equivalent to invoking AG_ExpandHoriz(3)).
AG_DIRDLG_VFILL: Expand vertically in parent (equivalent to invoking AG_ExpandVert(3)).
AG_DIRDLG_EXPAND: Shorthand for AG_DIRDLG_HFILL|AG_DIRDLG_VFILL.

The active directory can be set programmatically with the AG_DirDlgSetDirectory() function.

The AG_DirDlgSetDirectoryMRU() sets the working directory according to an AG_Config(3) parameter named mruKey If the parameter does not exist, it will be set to defaultDir (it is customary to use a name such as ‘myapp.mru.foodir’). If AG_DirDlgSetDirectoryMRU() is used, subsequent directory changes will cause the current AG_Config(3) settings to be saved automatically.

OK/CANCEL ACTIONS

By default, selecting a directory will trigger the following checks:

If AG_DIRDLG_LOAD or AG_DIRDLG_SAVE is set, check whether the directory is accessible or writeable.
Select the directory, raising a ‘dir-chosen’ event.
If AG_DIRDLG_CLOSEWIN is set, close the parent window.

The default action performed when a user clicks on "Cancel" is simply to close the parent window if AG_DIRDLG_CLOSEWIN is set.

These default actions can be overridden using the functions below:

void
AG_DirDlgOkAction(AG_DirDlg *dd, void (*fn)(AG_Event *), const char *fmt, ...);

void
AG_DirDlgCancelAction(AG_DirDlg *dd, void (*fn)(AG_Event *), const char *fmt, ...);

int
AG_DirDlgCheckReadAccess(AG_DirDlg *dd);

int
AG_DirDlgCheckWriteAccess(AG_DirDlg *dd);

The AG_DirDlgOkAction() function configures an event handler function to invoke when a directory is selected, overriding the default behavior. The event handler will be passed a string argument containing the absolute path to the selected directory.

AG_DirDlgCancelAction() overrides the default behavior of the "Cancel" button.

The utility functions AG_DirDlgCheckReadAccess() and AG_DirDlgCheckWriteAccess() evaluate whether the selected directory is readable or writeable.

BINDINGS

The AG_DirDlg widget does not provide any bindings.

EVENTS

The AG_DirDlg widget generates the following events:

dir-chosen(char *path): The user has selected the given directory. path is the full pathname to the directory.
dir-selected(char *path): The user has browsed to the given directory.

STRUCTURE DATA

For the AG_DirDlg object:

char cwd[AG_PATHNAME_MAX]: Absolute path of current working directory.

EXAMPLES

See tests/loader.c in the Agar source distribution.

HISTORY

The AG_DirDlg widget first appeared in Agar 1.4.1