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authormarha <marha@users.sourceforge.net>2009-11-06 06:59:46 +0000
committermarha <marha@users.sourceforge.net>2009-11-06 06:59:46 +0000
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+.\" $Xorg: CH5.intro,v 1.3 2000/08/17 19:42:26 cpqbld Exp $
+.LP
+.bp
+\&
+.sp 1
+.ce 3
+\s+1\fBChapter 5\fP\s-1
+
+\s+1\fBText Widgets\fP\s-1
+.sp 2
+.nr H1 5
+.nr H2 0
+.nr H3 0
+.nr H4 0
+.nr H5 0
+.na
+.LP
+.XS
+Chapter 5 - Text Widgets.
+.XE
+.LP
+The Text widget provides a window that will allow an application
+to display and edit one or more lines of text. Options are provided to
+allow the user to add Scrollbars to its window, search for a specific
+string, and modify the text in the buffer.
+.LP
+The Text widget is made up of a number of pieces; it was modularized to
+ease customization. The AsciiText widget class (actually not limited to
+ASCII but so named for compatibility) is be general enough to most
+needs. If more flexibility, special features, or extra functionality is
+needed, they can be added by implementing a new TextSource or TextSink, or
+by subclassing the Text Widget (See Section 5.8 for customization
+details.)
+.LP
+The words \fIinsertion point\fP are used in this chapter to refer to the text
+caret. This is the symbol that is displayed between two characters in
+the file. The insertion point marks the location where any new characters
+will be added to the file. To avoid confusion the pointer cursor will
+always be referred to as the \fIpointer\fP.
+.LP
+The text widget supports three edit modes, controlling the types of
+modifications a user is allowed to make:
+.IN "Text widget" "edit modes"
+.IP \(bu 5
+Append-only
+.IP \(bu 5
+Editable
+.IP \(bu 5
+Read-only
+.LP
+Read-only mode does not allow the user or the programmer to modify the text
+in the widget. While the entire string may be reset in
+read-only mode with \fBXtSetValues\fP, it cannot be modified via
+with \fBXawTextReplace\fP. Append-only and editable modes allow
+.IN "XawTextReplace" ""
+the text at the insertion point to be modified. The only difference is
+that text may only be added to or removed from the end of a buffer in
+append-only mode.
+.LP
+.NH 2
+Text Widget for Users
+.IN "Text widget" "User's Guide to the Text widget"
+.XS
+ Text Widget for Users
+.XE
+.LP
+The Text widget provides many of the common keyboard editing commands.
+These commands allow users to move around and edit the buffer. If an
+illegal operation is attempted, (such as deleting characters in a
+read-only text widget), the X server will beep.
+.NH 3
+Default Key Bindings
+.IN "Text widget" "default key bindings"
+.LP
+The default key bindings are patterned after those in the EMACS text editor:
+.sp
+.Ds 0
+.TA 1.0i 3.0i 4.5i
+.ta 1.0i 3.0i 4.5i
+Ctrl-a Beginning Of Line Meta-b Backward Word
+Ctrl-b Backward Character Meta-f Forward Word
+Ctrl-d Delete Next Character Meta-i Insert File
+Ctrl-e End Of Line Meta-k Kill To End Of Paragraph
+Ctrl-f Forward Character Meta-q Form Paragraph
+Ctrl-g Multiply Reset Meta-v Previous Page
+Ctrl-h Delete Previous Character Meta-y Insert Current Selection
+Ctrl-j Newline And Indent Meta-z Scroll One Line Down
+Ctrl-k Kill To End Of Line Meta-d Delete Next Word
+Ctrl-l Redraw Display Meta-D Kill Word
+Ctrl-m Newline Meta-h Delete Previous Word
+Ctrl-n Next Line Meta-H Backward Kill Word
+Ctrl-o Newline And Backup Meta-< Beginning Of File
+Ctrl-p Previous Line Meta-> End Of File
+Ctrl-r Search/Replace Backward Meta-] Forward Paragraph
+Ctrl-s Search/Replace Forward Meta-[ Backward Paragraph
+Ctrl-t Transpose Characters
+Ctrl-u Multiply by 4 Meta-Delete Delete Previous Word
+Ctrl-v Next Page Meta-Shift Delete Kill Previous Word
+Ctrl-w Kill Selection Meta-Backspace Delete Previous Word
+Ctrl-y Unkill Meta-Shift Backspace Kill Previous Word
+Ctrl-z Scroll One Line Up
+Ctrl-\\ Reconnect to input method
+Kanji Reconnect to input method
+.De
+.sp
+.LP
+In addition, the pointer may be used to cut and paste text:
+.LP
+.Ds
+.TA .5i 2.0i
+.ta .5i 2.0i
+ Button 1 Down Start Selection
+ Button 1 Motion Adjust Selection
+ Button 1 Up End Selection (cut)
+
+ Button 2 Down Insert Current Selection (paste)
+
+ Button 3 Down Extend Current Selection
+ Button 3 Motion Adjust Selection
+ Button 3 Up End Selection (cut)
+
+.De
+.LP
+Since all of these key and pointer bindings are set through the
+translations and resource manager, the user and the application
+programmer can modify them by changing the Text widget's
+\fBtranslations\fP resource.
+.\"
+.NH 3
+Search and Replace
+.IN "Text widget" "search"
+.IN "Text widget" "query replace"
+.LP
+The Text widget provides a search popup that can be used to search for a
+string within the current Text widget. The popup can be activated by
+typing either \fIControl-r\fP or \fIControl-s\fP. If \fIControl-s\fP is
+used the search will be forward in the file from the current location of the
+insertion point; if \fIControl-r\fP is used the search will be backward. The
+activated popup is placed under the pointer. It has a number of buttons
+that allow both text searches and text replacements to be performed.
+.LP
+At the top of the search popup are two toggle buttons labeled
+\fIbackward\fP and \fIforward\fP. One of these buttons will always be
+highlighted; this is the direction in which the search will be
+performed. The user can change the direction at any time by clicking on
+the appropriate button.
+.LP
+Directly under the buttons there are two text areas, one labeled
+\fISearch for:\fP and the other labeled \fIReplace with:\fP. If this is
+a read-only Text widget the \fIReplace with:\fP field will be insensitive
+and no replacements will be allowed. After each of these labels will be
+a text field. This field will allow the user to enter a string to
+search for and the string to replace it with. Only one of these text
+fields will have a window border around it; this is the active text
+field. Any key presses that occur when the focus in in the search popup
+will be directed to the active text field. There are also a few special
+key sequences:
+.DS
+.TA 1.75i
+.ta 1.75i
+\fBCarriage Return\fP: Execute the action, and pop down the search widget.
+\fBTab\fP: Execute the action, then move to the next field.
+\fBShift Carriage Return\fP: Execute the action, then move to the next field.
+\fBControl-q Tab\fP: Enter a Tab into a text field.
+\fBControl-c\fP: Pop down the search popup.
+.DE
+.LP
+Using these special key sequences should allow simple
+searches without ever removing one's hands from the keyboard.
+.LP
+Near the bottom of the search popup is a row of buttons. These buttons
+allow the same actions to to be performed as the key sequences, but the
+buttons will leave the popup active. This can be quite useful if many
+searches are being performed, as the popup will be left on the display.
+Since the search popup is a transient window, it may be picked
+up with the window manager and pulled off to the side for use
+at a later time.
+.IP \fBSearch\fP 15
+Search for the specified string.
+.IP \fBReplace\fP 15
+Replace the currently highlighted string with the string in the
+\fIReplace with\fP text field, and move onto the next occurrence of the
+\fISearch for\fP text field. The functionality is commonly referred to as
+query-replace.
+.IP \fBReplace-All\fP 15
+Replace all occurrences of the search string with the replace string from
+the current insertion point position to the end (or beginning) of the
+file. There is no key sequence to perform this action.
+.IP \fBCancel\fP 15
+Remove the search popup from the screen.
+.LP
+Finally, when \fBinternational\fP resource is \fBtrue\fP, there may be a
+pre-edit buffer below the button row, for composing input. Its presence
+is determined by the X locale in use and the VendorShell's \fBpreeditType\fP
+resource.
+.LP
+The widget hierarchy for the search popup is show below, all widgets
+are listed by class and instance name.
+.sp
+.nf
+.ta .5i 1.0i 1.5i 2.0i 2.5i
+Text <name of Text widget>
+ TransientShell search
+ Form form
+ Label label1
+ Label label2
+ Toggle backwards
+ Toggle forwards
+ Label searchLabel
+ Text searchText
+ Label replaceLabel
+ Text replaceText
+ Command search
+ Command replaceOne
+ Command replaceAll
+ Command cancel
+.fi
+.NH 3
+File Insertion
+.LP
+.IN "Text widget" "file insertion"
+To insert a file into a text widget, type the key sequence \fIMeta-i\fP,
+which will activate the file insert popup. This popup will appear under
+the pointer, and any text typed while the focus is in this popup will be
+redirected to the text field used for the filename. When the desired
+filename has been entered, click on \fIInsert File\fP, or type
+\fICarriage Return\fP. The named file will then be inserted in the text
+widget beginning at the insertion point position. If an error occurs when
+opening the file, an error message will be printed, prompting the user
+to enter the filename again. The file insert may be aborted by clicking
+on \fICancel\fP. If \fIMeta-i\fP is typed at a text widget that is
+read-only, it will beep, as no file insertion is allowed.
+.LP
+The widget hierarchy for the file insert popup is show below; all widgets
+are listed by class and instance name.
+.sp
+.nf
+.ta .5i 1.0i 1.5i 2.0i 2.5i
+Text <name of Text widget>
+ TransientShell insertFile
+ Form form
+ Label label
+ Text text
+ Command insert
+ Command cancel
+.fi
+.NH 3
+Text Selections for Users
+.LP
+.IN "Text widget" "Text Selections for Users"
+The text widgets have a text selection mechanism that allows
+the user to copy pieces of the text into the \fBPRIMARY\fP selection,
+and paste
+into the text widget some text that another application (or text
+widget) has put in the \fBPRIMARY\fP selection.
+.LP
+One method of selecting text is to press pointer button 1
+on the beginning of the text to be selected, drag the pointer until all
+of the desired text is highlighted, and then release the button to
+activate the selection. Another method is to click pointer button 1 at
+one end of the text to be selected, then click pointer button 3 at the
+other end.
+.LP
+To modify a currently active selection, press pointer button 3 near
+either the end of the selection that you want to
+adjust. This end of the selection may be moved while holding down pointer
+button 3. When the proper area has been highlighted release the pointer
+button to activate the selection.
+.LP
+The selected text may now be pasted into another application, and
+will remain active until some other client makes a selection.
+To paste text that some other application has
+put into the \fBPRIMARY\fP selection use pointer button 2.
+First place the insertion point where you would like the text to be inserted,
+then click and release pointer button 2.
+.LP
+Rapidly clicking pointer button 1 the following number of times will adjust
+the selection as described.
+.IP \fBTwo\fP 1.0i
+Select the word under the pointer. A word boundary is defined by the
+Text widget to be a Space, Tab, or Carriage Return.
+.IP \fBThree\fP 1.0i
+Select the line under the pointer.
+.IP \fBFour\fP 1.0i
+Select the paragraph under the pointer. A paragraph boundary is
+defined by the text widget as two Carriage Returns in a row with only
+Spaces or Tabs between them.
+.IP \fBFive\fP 1.0i
+Select the entire text buffer.
+.LP
+To unset the text selection, click pointer button 1
+without moving it.