Skip to main content

Cancellation of a 'Recent Items' Pull-Down Menu

Its been some time since support for 'recent file' operations was first added to the Gnocl sources. At the time I was quite pleased with its inclusion but there was always a annoying snag to it, something which is an inhereted feature from the API: if no selection if made, then the last file URI added to the list is always returned. This is not really a sign of anything lacking in the GTK sources, but the documentation does not suggest how to handle any need to CANCEL the menu by pressing the 'ESC' key.
 A quick gloss over the docs shows that there is a 'cancel' signal for the MENU-SHELL containing the recent items, but this automatically generates a 'selection-done' signal, the very signal that we want to avoid. The obvious solution for this is to set a boolean cancel flag and test for its TRUE or FALSE state during the execution of any 'selection-done' event handler.

For a TCL side solution it was first was necessary to implement a gnocl -onCancel option. So, this could added to any test script:

set cancel 0
set rc_menu [gnocl::menuRecentChooser \
...
-onCancel {  set cancel 1 } \
-onClicked {
     if { !$cancel } {
        set fname [string range %f 5 end]
        openFile $fname
        }
    set cancel 0
}

Works nicely, but it's better if this becomes invisible to the scripter.This of course, is not a problem to implement in C and so the relevant handlers have been modified to offer the benefit of this functionality.

Comments

Post a Comment

Popular posts from this blog

gnocl::calendar

Given this module some attention today. Added some of the more package wide options to the module and created customised handler for setting the month. (For some odd reason months are are counted 0-11 whereas days are 1-31.) There's still a little more to do to this one including the addition of code to store diary details. Here's the working test script to show the range of options at work. The percentage substitution string item %e explores something that I've been toying with, the name of the signal/event that initiated the call. Ok, a script can keep its own internal trace but who knows, it might prove useful. #--------------- # calendarTest.tcl #--------------- # Author:   William J Giddings # Date:     07/05/09 #--------------- #!/bin/sh # the next line restarts using tclsh \ exec tclsh "$0" "$@" #--------------- package require Gnocl set cal [gnocl::calendar] $cal configure -day 8 -month 7 -year 1956 $cal configure -rowHeight 1 -colWidth 1 $ca
7 comments
Read more

Creating a button box with right aligned widgets

The dialog widget has its own internal functionaluty to create and position buttons at the bottom right corner of the window container. When creating these for ourselves it must be born in mind that default settings for fill and expand are both 0.5. Failing to set these will always place the child objects in the centre, regardless of alignment. For most cases these defaults are acceptable but, to create that dialog-button arrangement, use the following snippet as a model!   # to right align completely, set expand and fill to 0 set hbox [gnocl::hBox] set b1 [gnocl::button -text Select \                -data $lst                 -onClicked { puts DO-SOMETHING-WITH-%d} ] set b2 [gnocl::button -text Cancel -onClicked { puts DONE! } ] $vbox add $hbox -expand 0 -fill 0 -align right $hbox add $b1 $hbox add $b2
Post a Comment
Read more

Gnocl Dashboard

Over the past few programming sessions I've been working on producing a central point, a dashboard, around which it's possible to see the various Gnocl widgets and commands in operation. In many ways like the demo script which shipped with the earlier releases of Gnocl but offers much more. The introspection functionality provides details of the various options and sub-commands of each Gnocl procedure which are displayed under the associated tab. Sample scripts are included for each item which offers newcomers a clearer insight into how make the most of what's on offer.
6 comments
Read more