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+# text.rb
+#
+# This demonstration script creates a text widget that describes
+# the basic editing functions.
+#
+# text (basic facilities) widget demo (called by 'widget')
+#
+
+# toplevel widget
+if defined?($text_demo) && $text_demo
+ $text_demo.destroy
+ $text_demo = nil
+end
+
+# demo toplevel widget
+$text_demo = TkToplevel.new {|w|
+ title("Text Demonstration - Basic Facilities")
+ iconname("text")
+ positionWindow(w)
+}
+
+# version check
+if ((Tk::TK_VERSION.split('.').collect{|n| n.to_i} <=> [8,4]) < 0)
+ undo_support = false
+else
+ undo_support = true
+end
+
+# frame
+TkFrame.new($text_demo) {|frame|
+ TkButton.new(frame) {
+ text 'Dismiss'
+ command proc{
+ tmppath = $text_demo
+ $text_demo = nil
+ tmppath.destroy
+ }
+ }.pack('side'=>'left', 'expand'=>'yes')
+
+ TkButton.new(frame) {
+ text 'Show Code'
+ command proc{showCode 'text'}
+ }.pack('side'=>'left', 'expand'=>'yes')
+}.pack('side'=>'bottom', 'fill'=>'x', 'pady'=>'2m')
+
+# text
+TkText.new($text_demo){|t|
+ relief 'sunken'
+ bd 2
+ setgrid 1
+ height 30
+ if undo_support
+ undo true
+ autoseparators true
+ end
+ TkScrollbar.new($text_demo) {|s|
+ pack('side'=>'right', 'fill'=>'y')
+ command proc{|*args| t.yview(*args)}
+ t.yscrollcommand proc{|first,last| s.set first,last}
+ }
+ pack('expand'=>'yes', 'fill'=>'both')
+
+ #
+ insert('0.0', <<EOT)
+This window is a text widget. It displays one or more lines of text
+and allows you to edit the text. Here is a summary of the things you
+can do to a text widget:
+
+1. Scrolling. Use the scrollbar to adjust the view in the text window.
+
+2. Scanning. Press mouse button 2 in the text window and drag up or down.
+This will drag the text at high speed to allow you to scan its contents.
+
+3. Insert text. Press mouse button 1 to set the insertion cursor, then
+type text. What you type will be added to the widget.
+
+4. Select. Press mouse button 1 and drag to select a range of characters.
+Once you've released the button, you can adjust the selection by pressing
+button 1 with the shift key down. This will reset the end of the
+selection nearest the mouse cursor and you can drag that end of the
+selection by dragging the mouse before releasing the mouse button.
+You can double-click to select whole words or triple-click to select
+whole lines.
+
+5. Delete and replace. To delete text, select the characters you'd like
+to delete and type Backspace or Delete. Alternatively, you can type new
+text, in which case it will replace the selected text.
+
+6. Copy the selection. To copy the selection into this window, select
+what you want to copy (either here or in another application), then
+click button 2 to copy the selection to the point of the mouse cursor.
+
+7. Edit. Text widgets support the standard Motif editing characters
+plus many Emacs editing characters. Backspace and Control-h erase the
+character to the left of the insertion cursor. Delete and Control-d
+erase the character to the right of the insertion cursor. Meta-backspace
+deletes the word to the left of the insertion cursor, and Meta-d deletes
+the word to the right of the insertion cursor. Control-k deletes from
+the insertion cursor to the end of the line, or it deletes the newline
+character if that is the only thing left on the line. Control-o opens
+a new line by inserting a newline character to the right of the insertion
+cursor. Control-t transposes the two characters on either side of the
+insertion cursor. #{
+ if undo_support
+ undo_text = "Control-z undoes the last editing action performed,\nand "
+ case $tk_platform['platform']
+ when "unix", "macintosh"
+ undo_text << "Control-Shift-z"
+ else # 'windows'
+ undo_text << "Control-y"
+ end
+ undo_text << "redoes undone edits."
+ else
+ ""
+ end
+}
+
+7. Resize the window. This widget has been configured with the "setGrid"
+option on, so that if you resize the window it will always resize to an
+even number of characters high and wide. Also, if you make the window
+narrow you can see that long lines automatically wrap around onto
+additional lines so that all the information is always visible.
+EOT
+
+ set_insert('0.0')
+}