ttk::entry(n) Tk Themed Widget ttk::entry(n)______________________________________________________________________________NAMEttk::entry - Editable text field widget
SYNOPSISttk::entry pathName ?options?
_________________________________________________________________DESCRIPTION
An ttk::entry widget displays a one-line text string and allows that
string to be edited by the user. The value of the string may be linked
to a Tcl variable with the -textvariable option. Entry widgets support
horizontal scrolling with the standard -xscrollcommand option and xview
widget command.
STANDARD OPTIONS-class-cursor-style
-takefocus-xscrollcommand
See the ttk_widget manual entry for details on the standard options.
WIDGET-SPECIFIC OPTIONS
[-exportselection exportSelection] A boolean value specifying whether
or not a selection in the widget should be linked to the X selection.
If the selection is exported, then selecting in the widget deselects
the current X selection, selecting outside the widget deselects any
widget selection, and the widget will respond to selection retrieval
requests when it has a selection. [-invalidcommand invalidCommand] A
script template to evaluate whenever the validateCommand returns 0.
See VALIDATION below for more information. [-justify justify] Speci‐
fies how the text is aligned within the entry widget. One of left,
center, or right. [-show show] If this option is specified, then the
true contents of the entry are not displayed in the window. Instead,
each character in the entry's value will be displayed as the first
character in the value of this option, such as “*” or a bullet. This
is useful, for example, if the entry is to be used to enter a password.
If characters in the entry are selected and copied elsewhere, the
information copied will be what is displayed, not the true contents of
the entry. [-state state] Compatibility option; see ttk::widget(n) for
details. Specifies one of three states for the entry, normal, dis‐
abled, or readonly. See WIDGET STATES, below. [-textvari‐
able textVariable] Specifies the name of a global variable whose value
is linked to the entry widget's contents. Whenever the variable
changes value, the widget's contents are updated, and vice versa.
[-validate validate] Specifies the mode in which validation should
operate: none, focus, focusin, focusout, key, or all. Default is none,
meaning that validation is disabled. See VALIDATION below. [-vali‐
datecommand validateCommand] A script template to evaluate whenever
validation is triggered. If set to the empty string (the default),
validation is disabled. The script must return a boolean value. See
VALIDATION below. [-width width] Specifies an integer value indicating
the desired width of the entry window, in average-size characters of
the widget's font.
NOTES
A portion of the entry may be selected as described below. If an entry
is exporting its selection (see the exportSelection option), then it
will observe the standard X11 protocols for handling the selection;
entry selections are available as type STRING. Entries also observe
the standard Tk rules for dealing with the input focus. When an entry
has the input focus it displays an insert cursor to indicate where new
characters will be inserted.
Entries are capable of displaying strings that are too long to fit
entirely within the widget's window. In this case, only a portion of
the string will be displayed; commands described below may be used to
change the view in the window. Entries use the standard xScrollCommand
mechanism for interacting with scrollbars (see the description of the
xScrollCommand option for details).
INDICES
Many of the entry widget commands take one or more indices as argu‐
ments. An index specifies a particular character in the entry's
string, in any of the following ways:
number Specifies the character as a numerical index, where 0 corre‐
sponds to the first character in the string.
@number
In this form, number is treated as an x-coordinate in the
entry's window; the character spanning that x-coordinate is
used. For example, “@0” indicates the left-most character in
the window.
end Indicates the character just after the last one in the entry's
string. This is equivalent to specifying a numerical index
equal to the length of the entry's string.
insert Indicates the character adjacent to and immediately following
the insert cursor.
sel.first
Indicates the first character in the selection. It is an error
to use this form if the selection is not in the entry window.
sel.last
Indicates the character just after the last one in the selec‐
tion. It is an error to use this form if the selection is not
in the entry window.
Abbreviations may be used for any of the forms above, e.g. “e” or
“sel.l”. In general, out-of-range indices are automatically rounded to
the nearest legal value.
WIDGET COMMAND
The following subcommands are possible for entry widgets:
pathName bbox index
Returns a list of four numbers describing the bounding box of
the character given by index. The first two elements of the
list give the x and y coordinates of the upper-left corner of
the screen area covered by the character (in pixels relative to
the widget) and the last two elements give the width and height
of the character, in pixels. The bounding box may refer to a
region outside the visible area of the window.
pathName delete first ?last?
Delete one or more elements of the entry. First is the index of
the first character to delete, and last is the index of the
character just after the last one to delete. If last is not
specified it defaults to first+1, i.e. a single character is
deleted. This command returns the empty string.
pathName get
Returns the entry's string.
pathName icursor index
Arrange for the insert cursor to be displayed just before the
character given by index. Returns the empty string.
pathName index index
Returns the numerical index corresponding to index.
pathName insert index string
Insert string just before the character indicated by index.
Returns the empty string.
pathName selection option arg
This command is used to adjust the selection within an entry.
It has several forms, depending on option:
pathName selection clear
Clear the selection if it is currently in this widget.
If the selection is not in this widget then the command
has no effect. Returns the empty string.
pathName selection present
Returns 1 if there is are characters selected in the
entry, 0 if nothing is selected.
pathName selection range start end
Sets the selection to include the characters starting
with the one indexed by start and ending with the one
just before end. If end refers to the same character as
start or an earlier one, then the entry's selection is
cleared.
pathName validate
Force revalidation, independent of the conditions specified by
the -validate option. Returns 0 if validation fails, 1 if it
succeeds. Sets or clears the invalid state accordingly. See
VALIDATION below for more details.
pathName xview args
This command is used to query and change the horizontal position
of the text in the widget's window. It can take any of the fol‐
lowing forms:
pathName xview
Returns a list containing two elements. Each element is
a real fraction between 0 and 1; together they describe
the horizontal span that is visible in the window. For
example, if the first element is .2 and the second ele‐
ment is .6, 20% of the entry's text is off-screen to the
left, the middle 40% is visible in the window, and 40% of
the text is off-screen to the right. These are the same
values passed to scrollbars via the -xscrollcommand
option.
pathName xview index
Adjusts the view in the window so that the character
given by index is displayed at the left edge of the win‐
dow.
pathName xview moveto fraction
Adjusts the view in the window so that the character
fraction of the way through the text appears at the left
edge of the window. Fraction must be a fraction between
0 and 1.
pathName xview scroll number what
This command shifts the view in the window left or right
according to number and what. Number must be an integer.
What must be either units or pages. If what is units,
the view adjusts left or right by number average-width
characters on the display; if it is pages then the view
adjusts by number screenfuls. If number is negative then
characters farther to the left become visible; if it is
positive then characters farther to the right become vis‐
ible.
The entry widget also supports the following generic ttk::widget widget
subcommands (see ttk::widget(n) for details):
cget configure identify
instate state
VALIDATION
The -validate, -validatecommand, and -invalidcommand options are used
to enable entry widget validation.
VALIDATION MODES
There are two main validation modes: prevalidation, in which the -vali‐
datecommand is evaluated prior to each edit and the return value is
used to determine whether to accept or reject the change; and revalida‐
tion, in which the -validatecommand is evaluated to determine whether
the current value is valid.
The -validate option determines when validation occurs; it may be set
to any of the following values:
none Default. This means validation will only occur when
specifically requested by the validate widget command.
key The entry will be prevalidated prior to each edit
(specifically, whenever the insert or delete widget com‐
mands are called). If prevalidation fails, the edit is
rejected.
focus The entry is revalidated when the entry receives or loses
focus.
focusin
The entry is revalidated when the entry receives focus.
focusout
The entry is revalidated when the entry loses focus.
all Validation is performed for all above conditions.
The -invalidcommand is evaluated whenever the -validatecommand returns
a false value.
The -validatecommand and -invalidcommand may modify the entry widget's
value via the widget insert or delete commands, or by setting the
linked -textvariable. If either does so during prevalidation, then the
edit is rejected regardless of the value returned by the -validatecom‐
mand.
If -validatecommand is empty (the default), validation always succeeds.
VALIDATION SCRIPT SUBSTITUTIONS
It is possible to perform percent substitutions on the -validatecommand
and -invalidcommand, just as in a bind script. The following substitu‐
tions are recognized:
%d Type of action: 1 for insert prevalidation, 0 for delete
prevalidation, or -1 for revalidation.
%i Index of character string to be inserted/deleted, if any,
otherwise -1.
%P In prevalidation, the new value of the entry if the edit
is accepted. In revalidation, the current value of the
entry.
%s The current value of entry prior to editing.
%S The text string being inserted/deleted, if any, {} other‐
wise.
%v The current value of the -validate option.
%V The validation condition that triggered the callback
(key, focusin, focusout, or forced).
%W The name of the entry widget.
DIFFERENCES FROM TK ENTRY WIDGET VALIDATION
The standard Tk entry widget automatically disables validation (by set‐
ting -validate to none) if the -validatecommand or -invalidcommand mod‐
ifies the entry's value. The Tk themed entry widget only disables val‐
idation if one of the validation scripts raises an error, or if -vali‐
datecommand does not return a valid boolean value. (Thus, it is not
necessary to re-enable validation after modifying the entry value in a
validation script).
In addition, the standard entry widget invokes validation whenever the
linked -textvariable is modified; the Tk themed entry widget does not.
DEFAULT BINDINGS
The entry widget's default bindings enable the following behavior. In
the descriptions below, “word” refers to a contiguous group of letters,
digits, or “_” characters, or any single character other than these.
· Clicking mouse button 1 positions the insert cursor just before the
character underneath the mouse cursor, sets the input focus to this
widget, and clears any selection in the widget. Dragging with
mouse button 1 down strokes out a selection between the insert cur‐
sor and the character under the mouse.
· Double-clicking with mouse button 1 selects the word under the
mouse and positions the insert cursor at the end of the word.
Dragging after a double click strokes out a selection consisting of
whole words.
· Triple-clicking with mouse button 1 selects all of the text in the
entry and positions the insert cursor at the end of the line.
· The ends of the selection can be adjusted by dragging with mouse
button 1 while the Shift key is down. If the button is double-
clicked before dragging then the selection will be adjusted in
units of whole words.
· Clicking mouse button 1 with the Control key down will position the
insert cursor in the entry without affecting the selection.
· If any normal printing characters are typed in an entry, they are
inserted at the point of the insert cursor.
· The view in the entry can be adjusted by dragging with mouse button
2. If mouse button 2 is clicked without moving the mouse, the
selection is copied into the entry at the position of the mouse
cursor.
· If the mouse is dragged out of the entry on the left or right sides
while button 1 is pressed, the entry will automatically scroll to
make more text visible (if there is more text off-screen on the
side where the mouse left the window).
· The Left and Right keys move the insert cursor one character to the
left or right; they also clear any selection in the entry. If
Left or Right is typed with the Shift key down, then the insertion
cursor moves and the selection is extended to include the new char‐
acter. Control-Left and Control-Right move the insert cursor by
words, and Control-Shift-Left and Control-Shift-Right move the
insert cursor by words and also extend the selection. Control-b
and Control-f behave the same as Left and Right, respectively.
· The Home key and Control-a move the insert cursor to the beginning
of the entry and clear any selection in the entry. Shift-Home
moves the insert cursor to the beginning of the entry and extends
the selection to that point.
· The End key and Control-e move the insert cursor to the end of the
entry and clear any selection in the entry. Shift-End moves the
cursor to the end and extends the selection to that point.
· Control-/ selects all the text in the entry.
· Control-\ clears any selection in the entry.
· The standard Tk <<Cut>>, <<Copy>>, <<Paste>>, and <<Clear>> virtual
events operate on the selection in the expected manner.
· The Delete key deletes the selection, if there is one in the entry.
If there is no selection, it deletes the character to the right of
the insert cursor.
· The BackSpace key and Control-h delete the selection, if there is
one in the entry. If there is no selection, it deletes the charac‐
ter to the left of the insert cursor.
· Control-d deletes the character to the right of the insert cursor.
· Control-k deletes all the characters to the right of the insertion
cursor.
WIDGET STATES
In the disabled state, the entry cannot be edited and the text cannot
be selected. In the readonly state, no insert cursor is displayed and
the entry cannot be edited (specifically: the insert and delete com‐
mands have no effect). The disabled state is the same as readonly, and
in addition text cannot be selected.
Note that changes to the linked -textvariable will still be reflected
in the entry, even if it is disabled or readonly.
Typically, the text is “grayed-out” in the disabled state, and a dif‐
ferent background is used in the readonly state.
The entry widget sets the invalid state if revalidation fails, and
clears it whenever validation succeeds.
SEE ALSOttk::widget(n), entry(n)KEYWORDS
entry, widget, text field
Tk 8.5 ttk::entry(n)
