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Diffstat (limited to 'doc/event.n')
| -rw-r--r-- | doc/event.n | 118 |
1 files changed, 105 insertions, 13 deletions
diff --git a/doc/event.n b/doc/event.n index fd0509f..c47a5fc 100644 --- a/doc/event.n +++ b/doc/event.n @@ -5,7 +5,7 @@ '\" See the file "license.terms" for information on usage and redistribution '\" of this file, and for a DISCLAIMER OF ALL WARRANTIES. '\" -'\" RCS: @(#) $Id: event.n,v 1.19 2007/12/13 15:23:43 dgp Exp $ +'\" RCS: @(#) $Id: event.n,v 1.23 2010/01/06 18:37:36 dkf Exp $ '\" .so man.macros .TH event n 8.3 Tk "Tk Built-In Commands" @@ -110,13 +110,11 @@ Corresponds to the \fB%b\fR substitution for binding scripts. \fINumber\fR must be an integer; it specifies the \fIcount\fR field for the event. Valid for \fBExpose\fR events. Corresponds to the \fB%c\fR substitution for binding scripts. -.VS 8.5 .TP \fB\-data\fI string\fR \fIString\fR may be any value; it specifies the \fIuser_data\fR field for the event. Only valid for virtual events. Corresponds to the \fB%d\fR substitution for virtual events in binding scripts. -.VE 8.5 .TP \fB\-delta\fI number\fR \fINumber\fR must be an integer; it specifies the \fIdelta\fR field @@ -310,6 +308,7 @@ Any options that are not specified when generating an event are filled with the value 0, except for \fIserial\fR, which is filled with the next X event serial number. .SH "PREDEFINED VIRTUAL EVENTS" +.PP Tk defines the following virtual events for the purposes of notification: .TP @@ -361,6 +360,26 @@ Copy the currently selected widget contents to the clipboard. \fB<<Cut>>\fR Move the currently selected widget contents to the clipboard. .TP +\fB<<LineEnd>>\fR +. +Move to the end of the line in the current widget while deselecting any +selected contents. +.TP +\fB<<LineStart>>\fR +. +Move to the start of the line in the current widget while deselecting any +selected contents. +.TP +\fB<<NextChar>>\fR +. +Move to the next item (i.e., visible character) in the current widget while +deselecting any selected contents. +.TP +\fB<<NextWord>>\fR +. +Move to the next group of items (i.e., visible word) in the current widget +while deselecting any selected contents. +.TP \fB<<Paste>>\fR Replace the currently selected widget contents with the contents of the clipboard. @@ -369,32 +388,80 @@ the clipboard. Insert the contents of the selection at the mouse location. (This event has meaningful \fB%x\fR and \fB%y\fR substitutions). .TP +\fB<<PrevChar>>\fR +. +Move to the previous item (i.e., visible character) in the current widget +while deselecting any selected contents. +.TP \fB<<PrevWindow>>\fR Traverse to the previous window. .TP +\fB<<PrevWord>>\fR +. +Move to the previous group of items (i.e., visible word) in the current widget +while deselecting any selected contents. +.TP \fB<<Redo>>\fR Redo one undone action. .TP +\fB<<SelectLineEnd>>\fR +. +Move to the end of the line in the current widget while extending the range +of selected contents. +.TP +\fB<<SelectLineStart>>\fR +. +Move to the start of the line in the current widget while extending the range +of selected contents. +.TP +\fB<<SelectNextChar>>\fR +. +Move to the next item (i.e., visible character) in the current widget while +extending the range of selected contents. +.TP +\fB<<SelectNextWord>>\fR +. +Move to the next group of items (i.e., visible word) in the current widget +while extending the range of selected contents. +.TP +\fB<<SelectPrevChar>>\fR +. +Move to the previous item (i.e., visible character) in the current widget +while extending the range of selected contents. +.TP +\fB<<SelectPrevWord>>\fR +. +Move to the previous group of items (i.e., visible word) in the current widget +while extending the range of selected contents. +.TP \fB<<Undo>>\fR Undo the last action. -.SH "VIRTUAL EVENT EXAMPLES" +.SH EXAMPLES +.SS "MAPPING KEYS TO VIRTUAL EVENTS" .PP In order for a virtual event binding to trigger, two things must happen. First, the virtual event must be defined with the \fBevent add\fR command. Second, a binding must be created for the virtual event with the \fBbind\fR command. Consider the following virtual event definitions: +.PP .CS -event add <<Paste>> <Control-y> -event add <<Paste>> <Button-2> -event add <<Save>> <Control-X><Control-S> -event add <<Save>> <Shift-F12> +\fBevent add\fR <<Paste>> <Control-y> +\fBevent add\fR <<Paste>> <Button-2> +\fBevent add\fR <<Save>> <Control-X><Control-S> +\fBevent add\fR <<Save>> <Shift-F12> +if {[tk windowingsystem] eq "aqua"} { + \fBevent add\fR <<Save>> <Command-s> +} .CE +.PP In the \fBbind\fR command, a virtual event can be bound like any other builtin event type as follows: +.PP .CS bind Entry <<Paste>> {%W insert [selection get]} .CE +.PP The double angle brackets are used to specify that a virtual event is being bound. If the user types Control-y or presses button 2, or if a \fB<<Paste>>\fR virtual event is synthesized with \fBevent generate\fR, @@ -403,11 +470,13 @@ then the \fB<<Paste>>\fR binding will be invoked. If a virtual binding has the exact same sequence as a separate physical binding, then the physical binding will take precedence. Consider the following example: +.PP .CS -event add <<Paste>> <Control-y> <Meta-Control-y> +\fBevent add\fR <<Paste>> <Control-y> <Meta-Control-y> bind Entry <Control-y> {puts Control-y} bind Entry <<Paste>> {puts Paste} .CE +.PP When the user types Control-y the \fB<Control-y>\fR binding will be invoked, because a physical event is considered more specific than a virtual event, all other things being equal. @@ -425,18 +494,41 @@ ungeneratable. When a definition of a virtual event changes at run time, all windows will respond immediately to the new definition. Starting from the preceding example, if the following code is executed: +.PP .CS -bind <Entry> <Control-y> {} -event add <<Paste>> <Key-F6> +bind Entry <Control-y> {} +\fBevent add\fR <<Paste>> <Key-F6> .CE +.PP the behavior will change such in two ways. First, the shadowed \fB<<Paste>>\fR binding will emerge. Typing Control-y will no longer invoke the \fB<Control-y>\fR binding, but instead invoke the virtual event \fB<<Paste>>\fR. Second, pressing the F6 key will now also invoke the \fB<<Paste>>\fR binding. - +.SS "MOVING THE MOUSE POINTER" +.PP +Sometimes it is useful to be able to really move the mouse pointer. For +example, if you have some software that is capable of demonstrating directly +to the user how to use the program. To do this, you need to +.QW warp +the mouse around by using \fBevent generate\fR, like this: +.PP +.CS +for {set xy 0} {$xy < 200} {incr xy} { + \fBevent generate\fR . <Motion> -x $xy -y $xy -warp 1 + update + after 50 +} +.CE +.PP +Note that it is usually considered bad style to move the mouse pointer for the +user because it removes control from them. Therefore this technique should be +used with caution. Also note that it is not guaranteed to function on all +platforms. .SH "SEE ALSO" bind(n) - .SH KEYWORDS event, binding, define, handle, virtual event +'\" Local Variables: +'\" mode: nroff +'\" End: |