Thursday, January 16, 2014

gnocl::richTextToolBar -working version ready...

Not working on any academic research over the past few days has given me time to focus on completing the implementation of a simple pango/html rich text edit widget. GtkHtml was one route to take but this is being phased out in favour of WebkitGtk (besides, GtkHtml documentation of any work simply doesn't exist). After hacking together an editor using the webKitGtk, which itself is something of a work around, I modified the existing gnocl webkit package to offer all the basic functionality of a simple html doc editor. But, this required implementing Javascript calls in C procs which were then called through a Tcl front end! Apart from the package taking a second or two to load, I found that webkitGtk will tend to crash after a while. Not much use to me! My aim is to create markup strings which can also be used for display within Gtk+ widgets during run-time, i.e. marked up labels or list entries. As a glance through previous blog postings will show, I had already put together some basics, exploring the task from both the Tcl and C side of things. At the end of the day, I coded the whole lot in C and it now works fine although some care needs to be taken when applying background colours. Needless to say, if there is an error in the pango markup then this won't cause a crash as the returned text will be stripped of any markup. Along with the editor, there's also a html-source viewer.

As the widget item name suggests, this is basically a toolbar, if the -text option is set, then any pre-existing text widget can be used.

Here's a snapshot and the script that created it.

# test_gtk_richTextToolBar.tcl
exec tclsh "$0" "$@"

package require Gnocl

set txt [gnocl::text -wrapMode word -markupTags 1 -baseFont {Sans 14}]
set app(rtbar) [gnocl::richTextToolBar -text $txt -textAccelerators 1 ]

$txt configure -onChanged {
           $app(rtf,lab1) configure -text [$txt getMarkup start end]
set vbox [gnocl::vBox]

set app(rtf,lab1) [gnocl::label -useMarkup 1 -justify left -align topLeft  -wrap 1 ]
set eb1 [gnocl::eventBox -child $app(rtf,lab1) -background white ]

$vbox add $eb1 -fill {1 1} -expand 1
$vbox add $app(rtbar)
$vbox add $txt -fill {1 1} -expand 1

gnocl::window -child $vbox -setSize 0.4

Sunday, January 05, 2014

New Year's Enhancements

Given some extra time to the implementation of the gnocl::toolBar items. Whilst is is possible to pack buttons, toggles and radio buttons into the toolbar, the custom items offer better formatting and are stylistically 'correct'. As the resulting module source code was stretching into thousands of lines, the toolbar.c module was split and the code for creating the 'items' shifted into separate files. Here's summary of the recent changes:

        o separated source code for the creation of toolbar items into
            individual modules.
        o -onToggled functionality now working properly for relevant
        o added %p substitution strings
        o added %p %d subtitution strings
        o new option -data

Updated code available from sourceforge.