scrollbar.wgt

一个跨平台的TCL/TK可视开发环境类似VC. TCL/TK是一个跨平台的脚本语言.

# $Id: scrollbar.wgt,v 1.6 2005/12/05 06:59:27 kenparkerjr Exp $

##############################################################################
#
# Visual TCL - A cross-platform application development environment
#
# Copyright (C) 2001 Damon Courtney
#
# Description file for Tk Widget
#
# 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		Scrollbar

DoubleClickCmd	vTcl:set_command
Icon		@vTcl::widgets::core::scrollbar::getIcon
TreeLabel	@vTcl::widgets::core::scrollbar::getWidgetTreeLabel
DefaultValues   -activebackground -background -cursor -highlightbackground \
                -highlightcolor -troughcolor
DontSaveOptions -width

Function	"Attach to Widget"	vTcl::widgets::core::scrollbar::attach

## Special proc for setting up icons on the toolbar.
proc vTcl:Scrollbar:ToolBarSetup {} {
    vTcl:toolbar_add core Scrollbar  \
	"vertical scrollbar" \
	icon_scrollbar_v.gif \
	"-orient vertical"

    vTcl:toolbar_add core Scrollbar \
    	"horizontal scrollbar" \
	icon_scrollbar_h.gif \
	"-orient horizontal"
}

namespace eval vTcl::widgets::core::scrollbar {

    proc getIcon {{w ""}} {
        if {[lempty $w]} {
	    return [list icon_scrollbar_h.gif icon_scrollbar_v.gif]
	}
 	if {[catch {$w cget -orient} orient]} {
	    return "icon_scrollbar.gif"
	}
        if {$orient == "horizontal"} {
	    return "icon_scrollbar_h.gif"
	}
        return "icon_scrollbar_v.gif"
    }

    proc getWidgetTreeLabel {w} {
        if {[catch {$w cget -orient} orient]} {
	    return "Scrollbar"
	}
        if {$orient == "horizontal"} {
	    return "Horz Scrollbar"
	}
        return "Vert Scrollbar"
    }

    proc attach {} {
    	global vTcl widgetSelected

    	set w $vTcl(w,widget)
    	set status $vTcl(status)

    	catch {unset widgetSelected}
    	vTcl:status "Select a widget to attach scrollbar to"
    	vwait widgetSelected

    	## Widget we're attaching to.
    	set a $vTcl(w,widget)

    	vTcl:status $status

    	set orient [$w cget -orient]

    	if {$orient == "horizontal"} {
	    set cmd xview
	    set opt -xscrollcommand
        } else {
    	    set cmd yview
	    set opt -yscrollcommand
        }

        if {[catch {$a cget $opt}]} {
    	    bell
	    error "Cannot attach scrollbar to that!"
	    return
        }

        $w configure -command "$a $cmd"
        vTcl:prop:save_opt_value $w -command "$a $cmd"
        $a configure $opt "$w set"
        vTcl:prop:save_opt_value $a $opt "$w set"
    }
}