class Tk::Entry
An entry is a widget that displays a one-line text string and allows that string to be edited using widget methods described below, which are typically bound to keystrokes and mouse actions. When first created, an entry's string is empty. 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 insertion 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; methods 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). They also support scanning, as described below.
Public Class Methods
# File lib/ffi-tk/widget/entry.rb, line 25 def self.tk_command 'entry' end
Public Instance Methods
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.
# File lib/ffi-tk/widget/entry.rb, line 58 def bbox(index) execute(:bbox, index).to_a(&:to_i) end
# File lib/ffi-tk/widget/entry.rb, line 38 def clear delete 0, :end end
# File lib/ffi-tk/widget/entry.rb, line 42 def cursor index(:insert) end
# File lib/ffi-tk/widget/entry.rb, line 46 def cursor=(index) icursor(index) end
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.
# File lib/ffi-tk/widget/entry.rb, line 67 def delete(first, last = None) execute(:delete, first, last) end
Returns the entry's string.
# File lib/ffi-tk/widget/entry.rb, line 72 def get execute(:get).to_s end
Arrange for the insertion cursor to be displayed just before the character given by index.
# File lib/ffi-tk/widget/entry.rb, line 78 def icursor(index) execute_only(:icursor, index) end
Returns the numerical index corresponding to index.
# File lib/ffi-tk/widget/entry.rb, line 83 def index(index) execute(:index, index) end
Insert the characters of string just before the character indicated by index.
# File lib/ffi-tk/widget/entry.rb, line 89 def insert(index, string) execute_only(:insert, index, string) end
This command computes the difference between its x argument and the x argument to the last scan mark command for the widget. It then adjusts the view left or right by 10 times the difference in x-coordinates. This command is typically associated with mouse motion events in the widget, to produce the effect of dragging the entry at high speed through the window.
# File lib/ffi-tk/widget/entry.rb, line 108 def scan_dragto(x) execute_only(:scan, :dragto, x) end
Records x and the current view in the entry window; used in conjunction with later scan dragto commands. Typically this command is associated with a mouse button press in the widget.
# File lib/ffi-tk/widget/entry.rb, line 97 def scan_mark(x) execute_only(:scan, :mark, x) end
Locate the end of the selection nearest to the character given by index, and adjust that end of the selection to be at index (i.e. including but not going beyond index). The other end of the selection is made the anchor point for future select to commands. If the selection is not currently in the entry, then a new selection is created to include the characters between index and the most recent selection anchor point, inclusive.
# File lib/ffi-tk/widget/entry.rb, line 120 def selection_adjust(index) execute_only(:selection, :adjust, index) end
Clear the selection if it is currently in this widget. If the selection is not in this widget then the command has no effect.
# File lib/ffi-tk/widget/entry.rb, line 126 def selection_clear execute_only(:selection, :clear) end
Set the selection anchor point to just before the character given by index. Does not change the selection.
# File lib/ffi-tk/widget/entry.rb, line 133 def selection_from(index) execute_only(:selection, :from, index) end
Returns true if there is are characters selected in the entry, false if nothing is selected.
# File lib/ffi-tk/widget/entry.rb, line 139 def selection_present execute(:selection, :present) == 1 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.
# File lib/ffi-tk/widget/entry.rb, line 147 def selection_range(from, to) execute_only(:selection, :range, from, to) end
If index is before the anchor point, set the selection to the characters from index up to but not including the anchor point. If index is the same as the anchor point, do nothing. If index is after the anchor point, set the selection to the characters from the anchor point up to but not including index. The anchor point is determined by the most recent select from or select adjust command in this widget. If the selection is not in this widget then a new selection is created using the most recent anchor point specified for the widget.
# File lib/ffi-tk/widget/entry.rb, line 160 def selection_to(index) execute_only(:selection, :to, index) end
This command is used to force an evaluation of the validateCommand independent of the conditions specified by the validate option. This is done by temporarily setting the validate option to all. It returns true or false.
# File lib/ffi-tk/widget/entry.rb, line 168 def validate execute(:validate) == 1 end
# File lib/ffi-tk/widget/entry.rb, line 29 def value get end
# File lib/ffi-tk/widget/entry.rb, line 33 def value=(string) delete 0, :end insert 0, string end
Adjusts the view in the window so that the character given by index is displayed at the left edge of the window.
If no index is given, it 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 0.2 and the second element is 0.6, 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.
# File lib/ffi-tk/widget/entry.rb, line 183 def xview(index = None) if index == None execute(:xview) else execute_only(:xview, index) end end
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.
# File lib/ffi-tk/widget/entry.rb, line 194 def xview_moveto(fraction) execute_only(:xview, :moveto, fraction) end
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 or an abbreviation of one of these. 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 visible.
# File lib/ffi-tk/widget/entry.rb, line 207 def xview_scroll(number, what) execute_only(:xview, :scroll, number, what) end