##############################################################################
# $Id: scrolledwindow.wgt,v 1.4 2003/05/03 08:13:57 cgavin Exp $
#
# Visual TCL - A cross-platform application development environment
#
# Copyright (C) 2001 Christian Gavin
#
# Description file for Bwidgets scrolled window
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#
##############################################################################

Class		      ScrolledWindow
Lib		      bwidget

Icon		      ../lib/Widgets/bwidget/scrolledwindow.gif
TreeLabel	      BWidget Scrolled Window
DefaultValues         -background
CreateCmd	      ScrolledWindow
MegaWidget	      yes
CreateCmd         vTcl::widgets::bwidgets::scrolledwindow::createCmd
InsertCmd         vTcl::widgets::bwidgets::scrolledwindow::insertCmd
TreeChildrenCmd   {vTcl::widgets::bwidgets::scrolledwindow::treeChildrenCmd
                   vTcl::widgets::bwidgets::scrolledwindow::treeChildrenChildsite}
DumpCmd           vTcl::widgets::bwidgets::scrolledwindow::dumpCmd
DumpInfoCmd       vTcl::widgets::bwidgets::scrolledwindow::dumpInfoCmd
IgnoreProc        ::ScrolledWindow::* ScrolledWindow
DeleteCmd         vTcl::widgets::bwidgets::scrolledwindow::deleteCmd
NewOption -auto     "Auto scroll"    choice   {none horizontal vertical both}

Export            vTcl::widgets::bwidgets::scrolledwindow::createCmd

##############################################################################

AdditionalClasses ScrollChildsite
Insertable        ScrollChildsite
InsertChildCmd    ::vTcl::widgets::bwidgets::scrollchildsite::insertChildCmd ScrollChildsite
Export            ::vTcl::widgets::bwidgets::scrollchildsite::widgetProc ScrollChildsite

namespace eval ::vTcl::widgets::bwidgets::scrollchildsite {

    proc widgetProc {w args} {
        set command [lindex $args 0]
        set args [lrange $args 1 end]
        set children [winfo children $w]
        set child [lindex $children 0]

        ## we have renamed the default widgetProc _<widgetpath>
        if {$command == "configure" && $args == ""} {
            if {$children == ""} {
                return [concat [uplevel _$w configure] \
                        [list {-xscrollcommand xScrollCommand ScrollCommand {} {}}] \
                        [list {-yscrollcommand yScrollCommand ScrollCommand {} {}}]]
            } else {
                return [concat [uplevel _$w configure] \
                        [list [$child configure -xscrollcommand]] \
                        [list [$child configure -yscrollcommand]]]
            }
        } elseif {$command == "configure" && [llength $args] > 1} {
            return [uplevel $child configure $args]
        } elseif {[string match ?view $command]} {
            return [uplevel $child $command $args]
        }

        uplevel _$w $command $args
    }

    proc insertChildCmd {target child} {
        set parent [winfo parent $target]
        pack $child -fill both -expand 1 
        ::vTcl::widgets::bwidgets::scrolledwindow::assignWidget $parent $parent.f
    }
}

namespace eval ::vTcl::widgets::bwidgets::scrolledwindow {

    proc createCmd {target args} {
        eval ScrolledWindow $target $args
        ## create a frame where user can insert widget to scroll
        frame $target.f -class ScrollChildsite

        ## change the widget procedure
        rename ::$target.f ::_$target.f
        proc ::$target.f {command args} \
	     "eval ::vTcl::widgets::bwidgets::scrollchildsite::widgetProc $target.f \$command \$args"
    }

    proc insertCmd {target} {
        ## note: this is done only inside vTcl to allow insertion of widget to scroll
        ##       currently dependent on the internals of the ScrolledWindow ver 1.3.1
        pack $target.f -fill both -expand 1
    }

    proc treeChildrenCmd {target {diff \#0}} {
        set children ""
        set wantsdiff [expr {$diff != ""}]

        foreach site [treeChildrenChildsite $target] {
            foreach child [::vTcl:complete_widget_tree $site $wantsdiff] {
                lappend children $child$diff
            }
        }

        return $children
    }

    proc assignWidget {target child} {
        variable inserted
        if {![info exists inserted($target)]} {
            $target setwidget $child
            set inserted($target) $child
        }
    }

    proc treeChildrenChildsite {target} {
        set site $target.f
        return $site
    }

    proc dumpCmd {target basename} {
        set result [vTcl:dump_widget_opt $target $basename]
        set child [lindex [winfo children [treeChildrenChildsite $target]] 0]
        if {$child != ""} {
            set subbasename [vTcl:base_name $child]
            set class [vTcl:get_class $child]
            append result [$::classes($class,dumpCmd) $child $subbasename]
            append result "$::vTcl(tab)pack $subbasename -fill both -expand 1\n"
            append result "$::vTcl(tab)$basename setwidget $basename.f\n"
        }
        return $result
    }

    proc dumpInfoCmd {target basename} {
        set result [vTcl:dump:widget_info $target $basename]
        set child [lindex [winfo children [treeChildrenChildsite $target]] 0]
        if {$child != ""} {
            set subbasename [vTcl:base_name $child]
            set class [vTcl:get_class $child]
            append result [$::classes($class,dumpInfoCmd) $child $subbasename]
        }
        return $result
    }

    proc deleteCmd {target} {
        variable inserted
        if {[info exists inserted($target)]} {
            unset inserted($target)
        }
        destroy $target
    }
}