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XmFileSelectionBox
Langue: en
Version: 322553 (ubuntu - 08/07/09)
Section: 3 (Bibliothèques de fonctions)
Sommaire
NAME
XmFileSelectionBox --- The FileSelectionBox widget classSYNOPSIS
#include <Xm/FileSB.h>
DESCRIPTION
FileSelectionBox traverses through directories, views the files and subdirectories in them, and then selects files.
A FileSelectionBox has five main areas:
- •
- A text input field for displaying and editing a directory mask used to select the files to be displayed
- •
- An optional text input field for displaying and editing a filter mask used to select the files to be displayed.
- •
- A scrollable list of filenames
- •
- A scrollable list of subdirectories
- •
- A text input field for displaying and editing a filename
- •
- A group of PushButtons, labeled OK, Filter, Cancel, and Help. The layout direction of the buttons depends on the XmNlayoutDirection resource.
####Additional children may be added to the FileSelectionBox after creation. FileSelectionBox inherits the layout functionality provided by SelectionBox for any additional children. To remove the list of filenames, the list of subdirectories, or both from the FileSelectionBox after creation, unmanage the appropriate widgets and their labels. The list and label widgets are obtained through a call to the XmFileSelectionBoxGetChild function. To remove either the directory list or the file list, unmanage the parent of the appropriate list widget and unmanage the corresponding label.
The user can specify resources in a resource file for the automatically created widgets and gadgets of FileSelectionBox. The following list identifies the names of these widgets (or gadgets) and the associated FileSelectionBox areas:
- FilterLabel
- FilterText
- Filter Text
- TextField
- Directory List
- DirList
- Directory List Label
- Dir
- DirL
- Label
- DirText
- TextField
The directory mask is a string specifying the base directory to be examined and a search pattern. Ordinarily, the directory list displays the subdirectories of the base directory, as well as the base directory itself and its parent directory. The file list ordinarily displays all files and/or subdirectories in the base directory that match the search pattern.
Optionally, the search pattern mask and the base directory can be displayed in two separate text fields. This option is controlled by the XmNpathMode resource. Using this alternate display does not change the meaning of resources that control the content of these fields: XmNdirectory, XmNdirMask, XmNpattern.
A procedure specified by the XmNqualifySearchDataProc resource extracts the base directory and search pattern from the directory mask. If the directory specification is empty, the current working directory is used. If the search pattern is empty, a pattern that matches all files is used.
An application can supply its own XmNqualifySearchDataProc as well as its own procedures to search for subdirectories and files. The default XmNqualifySearchDataProc works as follows: The directory mask is a pathname that can contain zero or more wildcard characters in its directory portion, its file portion, or both. The directory components of the directory mask --- up to, but not including, the first component with a wildcard character --- specify the directory to be searched, relative to the current working directory. The remaining components specify the search pattern. If the directory mask is empty or if its first component contains a wildcard character, the current working directory is searched. If no component of the directory mask contains a wildcard character, the entire directory mask is the directory specification, and all files in that directory are matched.
The user can select a new directory to examine by scrolling through the list of directories and selecting the desired directory or by editing the directory mask. Selecting a new directory from the directory list does not change the search pattern. A user can select a new search pattern by editing the directory mask or, when the FileSelectionBox has the optional XmNpathMode XmPATH_MODE_RELATIVE display, the filter text field. Double clicking or pressing KActivate on a directory in the directory list initiates a search for files and subdirectories in the new directory, using the current search pattern.
The user can select a file by scrolling through the list of filenames and selecting the desired file or by entering the filename directly into the text edit area. Selecting a file from the list causes that filename to appear in the file selection text edit area.
The user may select a new file as many times as desired. The application is not notified until the user takes one of the following actions:
- •
- Selects the OK PushButton
- •
- Presses KActivate while the selection text edit area has the keyboard focus
- •
- Double clicks or presses KActivate on an item in the file list
FileSelectionBox initiates a directory and file search when any of the following occurs:
- •
- The FileSelectionBox is initialized
- •
- The function XtSetValues is used to change XmNdirMask, XmNdirectory, XmNpattern, or XmNfileTypeMask
- •
- The user activates the Filter PushButton
- •
- The user double clicks or presses KActivate on an item in the directory list
- •
- The application calls XmFileSelectionDoSearch
- •
- The user presses KActivate while the directory mask text edit area has the keyboard focus
When a file search is initiated, the FileSelectionBox takes the following actions:
- •
- Constructs an XmFileSelectionBoxCallbackStruct structure with values appropriate for the action that initiated the search
- •
- Calls the XmNqualifySearchDataProc with the callback structure as the data input argument
- •
- Sets XmNdirectoryValid and XmNlistUpdated to False
- •
- Calls the XmNdirSearchProc with the qualified data returned by the XmNqualifySearchDataProc
If XmNdirectoryValid is True, the FileSelectionBox takes the following additional actions:
- •
- Sets XmNlistUpdated to False
- •
- Calls the XmNfileSearchProc with the qualified data returned by the XmNqualifySearchDataProc (and possibly modified by the XmNdirSearchProc)
- •
- If XmNlistUpdated is True and the file list is empty, displays the XmNnoMatchString in the file list and clears the selection text and XmNdirSpec
- •
- If XmNlistUpdated is True and the file list is not empty, sets the selection text and XmNdirSpec to the qualified dir returned by the XmNqualifySearchDataProc (and possibly modified by the XmNdirSearchProc)
- •
- Sets the directory mask text and XmNdirMask to the qualified mask returned by the XmNqualifySearchDataProc (and possibly modified by the XmNdirSearchProc)
- •
- Sets XmNdirectory to the qualified dir returned by the XmNqualifySearchDataProc (and possibly modified by the XmNdirSearchProc)
- •
- Sets XmNpattern to the qualified pattern returned by the XmNqualifySearchDataProc (and possibly modified by the XmNdirSearchProc)
FileSelectionBox uses the XmQTactivatable trait.
Data Transfer Behavior
Child widgets of a FileSelectionBox support the data transfer operations and targets associated with their widget classes.
In addition, if the source of a data transfer is the directory list and if XmNdirSearchProc has its default value, the directory list supports the FILE and FILE_NAME targets.
If the source of a data transfer is the file list and if XmNfileSearchProc has its default value, the file list supports the FILE and FILE_NAME targets.
In either case, FileSelectionBox adds an XmNconvertCallback procedure to the appropriate list. This procedure adds FILE and FILE_NAME to the TARGETS returned by the list. It treats requests for conversion of a selection to FILE and FILE_NAME exactly like requests for conversion to TEXT.
If an application changes XmNdirSearchProc or XmNfileSearchProc and wants to support the FILE and FILE_NAME targets on the corresponding list, it must provide support itself by adding a procedure to the list's XmNconvertCallback list.
Descendants
FileSelectionBox automatically creates the descendants shown in the following table. An application can use XtNameToWidget to gain access to the named descendant. In addition, a user or an application can use the named descendant when specifying resource values.
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Classes
FileSelectionBox inherits behavior, resources, and traits from Core, Composite, Constraint, XmManager, XmBulletinBoard, and XmSelectionBox.
The class pointer is xmFileSelectionBoxWidgetClass.
The class name is XmFileSelectionBox.
New Resources
The following table defines a set of widget resources used by the programmer to specify data. The programmer can also set the resource values for the inherited classes to set attributes for this widget. To reference a resource by name or by class in a .Xdefaults file, remove the XmN or XmC prefix and use the remaining letters. To specify one of the defined values for a resource in a .Xdefaults file, remove the Xm prefix and use the remaining letters (in either lowercase or uppercase, but include any underscores between words). The codes in the access column indicate if the given resource can be set at creation time (C), set by using XtSetValues (S), retrieved by using XtGetValues (G), or is not applicable (N/A).
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- XmNdirectory
- Specifies the base directory used in combination with XmNpattern in determining the files and directories to be displayed. The default value is determined by the XmNqualifySearchDataProc and depends on the initial values of XmNdirMask, XmNdirectory, and XmNpattern. If the default is NULL or empty, the current working directory is used.
- XmNdirectoryValid
- Specifies an attribute that is set only by the directory search procedure. The value is set to True if the directory passed to the directory search procedure can actually be searched. If this value is False the file search procedure is not called, and XmNdirMask, XmNdirectory, and XmNpattern are not changed.
- XmNdirListItems
- Specifies the items in the directory list. XtGetValues for this resource returns the list items themselves, not a copy of the list items. The application must not free the returned items.
- XmNdirListItemCount
- Specifies the number of items in the directory list. The value must not be negative.
- XmNdirListLabelString
- Specifies the label string of the directory list. The default for this resource depends on the locale. In the C locale the default is Directories.
- Now that some default localized label strings are provided through message catalogs for the children of composite widgets, the labelString resources cannot be set on the child through default resource files. Instead, the resource provided at the parent level must be used.
- XmNdirMask
- Specifies the directory mask used in determining the files and directories to be displayed. The default value is determined by the XmNqualifySearchDataProc and depends on the initial values of XmNdirMask, XmNdirectory, and XmNpattern.
- XmNdirSearchProc
- Specifies a directory search procedure to replace the default directory search procedure. FileSelectionBox's default directory search procedure fulfills the needs of most applications. Because it is impossible to cover the requirements of all applications, you can replace the default search procedure.
- The directory search procedure is called with two arguments: the FileSelectionBox widget and a pointer to an XmFileSelectionBoxCallbackStruct structure. The callback structure is generated by the XmNqualifySearchDataProc and contains all information required to conduct a directory search, including the directory mask and a qualified base directory and search pattern. Once called, it is up to the search routine to generate a new list of directories and update the FileSelectionBox widget by using XtSetValues.
- The search procedure must set XmNdirectoryValid and XmNlistUpdated. If it generates a new list of directories, it must also set XmNdirListItems and XmNdirListItemCount.
- If the search procedure cannot search the specified directory, it must warn the user and set XmNdirectoryValid and XmNlistUpdated to False, unless it prompts and subsequently obtains a valid directory. If the directory is valid but is the same as the current XmNdirectory, the search procedure must set XmNdirectoryValid to True, but it may elect not to generate a new list of directories. In this case, it must set XmNlistUpdated to False.
- If the search procedure generates a new list of directories, it must set XmNdirListItems to the new list of directories and XmNdirListItemCount to the number of items in the list. If there are no directories, it sets XmNdirListItems to NULL and XmNdirListItemCount to 0 (zero). In either case, it must set XmNdirectoryValid and XmNlistUpdated to True.
- The search procedure ordinarily should not change the callback structure. But if the original directory is not valid, the search procedure may obtain a new directory from the user. In this case, it should set the dir member of the callback structure to the new directory, call the XmNqualifySearchDataProc with the callback struct as the input argument, and copy the qualified data returned by the XmNqualifySearchDataProc into the callback struct.
- XmNdirSpec
- Specifies the full file path specification. This is the XmNtextString resource in SelectionBox, renamed for FileSelectionBox. The default value is determined by the FileSelectionBox after conducting the initial directory and file search.
- XmNdirTextLabelString
- Uses the specified XmString as the label above the TextField directory. The resource takes effect when the XmNpathMode resource has a value of XmPATH_MODE_RELATIVE. It is ignored when the XmNpathMode resource has a value of XmPATH_MODE_FULL.
- Now that some default localized label strings are provided through message catalogs for the children of composite widgets, the labelString resources cannot be set on the child through default resource files. Instead, the resource provided at the parent level must be used.
- XmNfileFilterStyle
- Specifies whether or not the "hidden" files (those whose names begin with . (period) in POSIX systems) will be listed in the file and directory scrolling lists (where the default directory search procedure is used). The possible values are:
-
- XmFILTER_NONE
- Does not filter hidden files.
- XmFILTER_HIDDEN_FILES
- Restricts the list of possible file names, such as those beginning with . (period).
-
- XmNfileListItems
- Specifies the items in the file list. This is the XmNlistItems resource in SelectionBox, renamed for FileSelectionBox. XtGetValues for this resource returns the list items themselves, not a copy of the list items. The application must not free the returned items.
- XmNfileListItemCount
- Specifies the number of items in the file list. This is the XmNlistItemCount resource in SelectionBox, renamed for FileSelectionBox. The value must not be negative.
- XmNfileListLabelString
- Specifies the label string of the file list. This is the XmNlistLabelString resource in SelectionBox, renamed for FileSelectionBox. The default for this resource depends on the locale. In the C locale the default is Files.
- Now that some default localized label strings are provided through message catalogs for the children of composite widgets, the labelString resources cannot be set on the child through default resource files. Instead, the resource provided at the parent level must be used.
- XmNfileSearchProc
- Specifies a file search procedure to replace the default file search procedure. FileSelectionBox's default file search procedure fulfills the needs of most applications. Because it is impossible to cover the requirements of all applications, you can replace the default search procedure.
- The file search procedure is called with two arguments: the FileSelectionBox widget and a pointer to an XmFileSelectionBoxCallbackStruct structure. The callback structure is generated by the XmNqualifySearchDataProc (and possibly modified by the XmNdirSearchProc). It contains all information required to conduct a file search, including the directory mask and a qualified base directory and search pattern. Once this procedure is called, it is up to the search routine to generate a new list of files and update the FileSelectionBox widget by using XtSetValues.
- The search procedure must set XmNlistUpdated. If it generates a new list of files, it must also set XmNfileListItems and XmNfileListItemCount.
- It is recommended that the search procedure always generate a new list of files. If the mask member of the callback structure is the same as the mask member of the callback struct in the preceding call to the search procedure, the procedure may elect not to generate a new list of files. In this case it must set XmNlistUpdated to False.
- If the search procedure generates a new list of files, it must set XmNfileListItems to the new list of files and XmNfileListItemCount to the number of items in the list. If there are no files, it sets XmNfileListItems to NULL and XmNfileListItemCount to 0 (zero). In either case it must set XmNlistUpdated to True.
- In constructing the list of files, the search procedure should include only files of the types specified by the widget's XmNfileTypeMask.
- Setting XmNdirSpec is optional, but recommended. Set this attribute to the full file specification of the directory searched. The directory specification is displayed below the directory and file lists.
- XmNfileTypeMask
- Specifies the type of files listed in the file list. The possible values are
-
- XmFILE_REGULAR
- Restricts the file list to contain only regular files.
- XmFILE_DIRECTORY
- Restricts the file list to contain only directories.
- XmFILE_ANY_TYPE
- Allows the list to contain all file types including directories.
-
- XmNfilterLabelString
- Specifies the label string for the text entry field for the directory mask. The default for this resource depends on the locale. In the C locale the default is Filter.
- Now that some default localized label strings are provided through message catalogs for the children of composite widgets, the labelString resources cannot be set on the child through default resource files. Instead, the resource provided at the parent level must be used.
- XmNlistUpdated
- Specifies an attribute that is set only by the directory and file search procedures. This resource is set to True if the search procedure updated the directory or file list.
- XmNnoMatchString
- Specifies a string to be displayed in the file list if the list of files is empty.
- XmNpattern
- Specifies the search pattern used in combination with XmNdirectory in determining the files and directories to be displayed. The default value is determined by XmNqualifySearchDataProc and depends on the initial values of XmNdirMask, XmNdirectory, and XmNpattern. If the default is NULL or empty, a pattern that matches all files is used.
- XmNpathMode
- Specifies whether or not an additional text field will be used to display and edit the filter. The possible values are
-
- XmPATH_MODE_FULL
- Specifies that no additional text field will be used to display the filter. There will just be a single text field to display XmNdirMask.
- XmPATH_MODE_RELATIVE
- Specifies that there will be two text field displays, one to display the XmNdirectory and one to display the XmNpattern. In this instance, the XmNfilterLabelString resource applies to the text field for XmNpattern and XmNdirTextLabelString applies to the text field for XmNdirectory.
-
- XmNqualifySearchDataProc
- Specifies a search data qualification procedure to replace the default data qualification procedure. FileSelectionBox's default data qualification procedure fulfills the needs of most applications. Because it is impossible to cover the requirements of all applications, you can replace the default procedure.
- The data qualification procedure is called to generate a qualified directory mask, base directory, and search pattern for use by the directory and file search procedures. It is called with three arguments: the FileSelectionBox widget and pointers to two XmFileSelectionBoxCallbackStruct structures. The first callback structure contains the input data. The second callback structure contains the output data, to be filled in by the data qualification procedure.
- If the input dir and pattern members are not NULL, the procedure must copy them to the corresponding members of the output callback structure.
- If the input dir is NULL, the procedure constructs the output dir as follows: If the input mask member is NULL, the procedure uses the widget's XmNdirectory as the output dir; otherwise, it extracts the output dir from the input mask. If the resulting output dir is empty, the procedure uses the current working directory instead.
- If the input pattern is NULL, the procedure constructs the output pattern as follows: If the input mask member is NULL, the procedure uses the widget's XmNpattern as the output pattern; otherwise, it extracts the output pattern from the input mask. If the resulting output pattern is empty, the procedure uses a pattern that matches all files instead.
- The data qualification procedure constructs the output mask from the output dir and pattern. The procedure must ensure that the output dir, pattern, and mask are fully qualified.
- If the input value member is not NULL, the procedure must copy it to the output value member; otherwise, the procedure must copy the widget's XmNdirSpec to the output value.
- The data qualification procedure must calculate the lengths of the output value, mask, dir, and pattern members and must fill in the corresponding length members of the output callback struct.
- The data qualification procedure must copy the input reason and event members to the corresponding output members.
The values of the XmNdirSearchProc and XmNfileSearchProc are procedure pointers of type XmSearchProc, defined as follows:
void (* XmSearchProc) (w, search_data)
Widget w;
XtPointer search_data;
- w
- The FileSelectionBox widget
- search_data
- Pointer to an XmFileSelectionBoxCallbackStruct containing information for conducting a search
The value of the XmNqualifySearchDataProc resource is a procedure pointer of type XmQualifyProc, defined as follows:
void (* XmQualifyProc) (w, input_data, output_data)
Widget w;
XtPointer input_data;
XtPointer output_data;
- w
- The FileSelectionBox widget
- input_data
- Pointer to an XmFileSelectionBoxCallbackStruct containing input data to be qualified
- output_data
- Pointer to an XmFileSelectionBoxCallbackStruct containing output data to be filled in by the qualification procedure
Inherited Resources
FileSelectionBox inherits behavior and resources from the superclasses described in the following tables. For a complete description of each resource, refer to the reference page for that superclass.
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Callback Information
A pointer to the following structure is passed to each callback:
typedef struct
{
int reason;
XEvent * event;
XmString value;
int length;
XmString mask;
int mask_length;
XmString dir;
int dir_length;
XmString pattern;
int pattern_length;
} XmFileSelectionBoxCallbackStruct;
- reason
- Indicates why the callback was invoked
- event
- Points to the XEvent that triggered the callback
- value
- Specifies the current value of XmNdirSpec
- length
- Specifies the number of bytes in value This member is obsolete and exists for compatibility with earlier releases.
- mask
- Specifies the current value of XmNdirMask
- mask_length
- Specifies the number of bytes in mask This member is obsolete and exists for compatibility with earlier releases.
- dir
- Specifies the current base directory
- dir_length
- Specifies the number of bytes in dir This member is obsolete and exists for compatibility with earlier releases.
- pattern
- Specifies the current search pattern
- pattern_length
- Specifies the number of bytes in pattern This member is obsolete and exists for compatibility with earlier releases.
Translations
XmFileSelectionBox inherits translations from XmSelectionBox.
Accelerators
The XmNtextAccelerators from XmSelectionBox are added to the selection and directory mask (filter) Text descendants of XmFileSelectionBox.
Action Routines
The XmFileSelectionBox action routines are
- SelectionBoxUpOrDown(Previous|Next|First|Last):
- If neither the selection text nor the directory mask (filter) text has the focus, this action does nothing.
- If the selection text has the focus, the term list in the following description refers to the file list, and the term text refers to the selection text. If the directory mask text has the focus, list refers to the directory list, and text refers to the directory mask text.
- When called with an argument of Previous, or 0 (zero) for compatibility, this action selects the previous item in the list and replaces the text with that item.
- When called with an argument of Next, or 1 for compatibility, this action selects the next item in the list and replaces the text with that item.
- When called with an argument of First, or 2 for compatibility, this action selects the first item in the list and replaces the text with that item.
- When called with an argument of Last, or 3 for compatibility, this action selects the last item in the list and replaces the text with that item.
- SelectionBoxRestore():
- If neither the selection text nor the directory mask (filter) text has the focus, this action does nothing.
- If the selection text has the focus, this action replaces the selection text with the selected item in the file list. If no item in the file list is selected, it clears the selection text.
- If the directory mask text has the focus, this action replaces the directory mask text with a new directory mask constructed from the XmNdirectory and XmNpattern resources.
Additional Behavior
The FileSelectionBox widget has the following additional behavior:
- <Key><osfCancel>:
- Calls the activate callbacks for the cancel button if it is sensitive. If no cancel button exists and the parent of the FileSelectionBox is a manager, it passes the event to the parent.
- <Key><osfActivate> in Selection Text:
- Calls the selection text widget's XmNactivateCallback callbacks. If XmNmustMatch is True and the selection text does not match an item in the file list, it calls the XmNnoMatchCallback callbacks with reason XmCR_NO_MATCH. Otherwise, it calls the XmNokCallback callbacks with reason XmCR_OK.
- <Key><osfActivate> in Directory Mask Text:
- Calls the directory mask text widget's XmNactivateCallback callbacks, initiates a directory and file search, and calls the XmNapplyCallback callbacks with reason XmCR_APPLY.
- <Btn1Down>(2+) or <Key><osfActivate> in Directory List:
- Calls the directory list widget's XmNdefaultActionCallback callbacks, initiates a directory and file search, and calls the XmNapplyCallback callbacks with reason XmCR_APPLY.
- <Btn1Down>(2+) or <Key><osfActivate> in File List:
- Calls the file list widget's XmNdefaultActionCallback callbacks and calls the XmNokCallback callbacks with reason XmCR_OK.
- <Key><osfSelect> in Directory List:
- Generates a new directory mask, using the selected list item as the directory and the pattern extracted from the current directory mask text as the search pattern. If the search pattern is empty, it uses a pattern that matches all files in the directory. Replaces the directory mask text with the new directory mask.
- <Key><osfSelect> in File List:
- Replaces the selection text with the selected list item.
- <Btn2Down> in File List:
- Drags the content of one or more selected list items using the drag and drop facility. If <Btn2Down is pressed on an unselected item, drags only that item, excluding any other selected items.
- This action sets the XmNconvertProc of the DragContext to a function that calls the XmNconvertCallback procedures of the file list, possibly multiple times, for the _MOTIF_DROP selection.
- <Btn2Down> in Directory List:
- Drags the content of one or more selected list items using the drag and drop facility. If <Btn2Down is pressed on an unselected item, it drags only that item, excluding any other selected items.
- This action sets the XmNconvertProc of the DragContext to a function that calls the XmNconvertCallback procedures of the directory list, possibly multiple times, for the _MOTIF_DROP selection.
- <Apply Button Activated>:
- Initiates a directory and file search. Calls the XmNapplyCallback callbacks with reason XmCR_APPLY.
- <OK Button Activated>:
- If XmNmustMatch is True and the selection text does not match an item in the file list, calls the XmNnoMatchCallback callbacks with reason XmCR_NO_MATCH. Otherwise, calls the XmNokCallback callbacks with reason XmCR_OK.
- <Cancel Button Activated>:
- Calls the XmNcancelCallback callbacks with reason XmCR_CANCEL.
- <Help Button Activated>:
- Calls the XmNhelpCallback callbacks with reason XmCR_HELP.
- <Key><osfActivate>:
- If no button, list widget, or text widget has the keyboard focus, if XmNmustMatch is True and the selection text does not match an item in the file list, it calls the XmNnoMatchCallback callbacks with reason XmCR_NO_MATCH. Otherwise, it calls the XmNokCallback callbacks with reason XmCR_OK.
Virtual Bindings
The bindings for virtual keys are vendor specific. For information about bindings for virtual buttons and keys, see VirtualBindings(3).
RELATED
Composite(3), Constraint(3), Core(3), XmBulletinBoard(3), XmCreateFileSelectionBox(3), XmCreateFileSelectionDialog(3), XmFileSelectionBoxGetChild(3), XmFileSelectionDoSearch(3), XmManager(3), and XmSelectionBox(3).
Contenus ©2006-2024 Benjamin Poulain
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