# cscroll.tcl -- # # This demonstration script creates a simple canvas that can be # scrolled in two dimensions. # # RCS: @(#) $Id: cscroll.tcl,v 1.3.4.1 2005/12/13 03:44:42 das Exp $ if {![info exists widgetDemo]} { error "This script should be run from the \"widget\" demo." } set w .cscroll catch {destroy $w} toplevel $w wm title $w "Scrollable Canvas Demonstration" wm iconname $w "cscroll" positionWindow $w set c $w.c label $w.msg -font $font -wraplength 4i -justify left -text "This window displays a canvas widget that can be scrolled either using the scrollbars or by dragging with button 2 in the canvas. If you click button 1 on one of the rectangles, its indices will be printed on stdout." pack $w.msg -side top frame $w.buttons pack $w.buttons -side bottom -fill x -pady 2m button $w.buttons.dismiss -text Dismiss -command "destroy $w" button $w.buttons.code -text "See Code" -command "showCode $w" pack $w.buttons.dismiss $w.buttons.code -side left -expand 1 frame $w.grid scrollbar $w.hscroll -orient horiz -command "$c xview" scrollbar $w.vscroll -command "$c yview" canvas $c -relief sunken -borderwidth 2 -scrollregion {-11c -11c 50c 20c} \ -xscrollcommand "$w.hscroll set" \ -yscrollcommand "$w.vscroll set" pack $w.grid -expand yes -fill both -padx 1 -pady 1 grid rowconfig $w.grid 0 -weight 1 -minsize 0 grid columnconfig $w.grid 0 -weight 1 -minsize 0 grid $c -padx 1 -in $w.grid -pady 1 \ -row 0 -column 0 -rowspan 1 -columnspan 1 -sticky news grid $w.vscroll -in $w.grid -padx 1 -pady 1 \ -row 0 -column 1 -rowspan 1 -columnspan 1 -sticky news grid $w.hscroll -in $w.grid -padx 1 -pady 1 \ -row 1 -column 0 -rowspan 1 -columnspan 1 -sticky news set bg [lindex [$c config -bg] 4] for {set i 0} {$i < 20} {incr i} { set x [expr {-10 + 3*$i}] for {set j 0; set y -10} {$j < 10} {incr j; incr y 3} { $c create rect ${x}c ${y}c [expr {$x+2}]c [expr {$y+2}]c \ -outline black -fill $bg -tags rect $c create text [expr {$x+1}]c [expr {$y+1}]c -text "$i,$j" \ -anchor center -tags text } } $c bind all "scrollEnter $c" $c bind all "scrollLeave $c" $c bind all <1> "scrollButton $c" bind $c <2> "$c scan mark %x %y" bind $c "$c scan dragto %x %y" if {[tk windowingsystem] eq "aqua"} { bind $c { %W yview scroll [expr {- (%D)}] units } bind $c { %W yview scroll [expr {-10 * (%D)}] units } bind $c { %W xview scroll [expr {- (%D)}] units } bind $c { %W xview scroll [expr {-10 * (%D)}] units } } proc scrollEnter canvas { global oldFill set id [$canvas find withtag current] if {[lsearch [$canvas gettags current] text] >= 0} { set id [expr {$id-1}] } set oldFill [lindex [$canvas itemconfig $id -fill] 4] if {[winfo depth $canvas] > 1} { $canvas itemconfigure $id -fill SeaGreen1 } else { $canvas itemconfigure $id -fill black $canvas itemconfigure [expr {$id+1}] -fill white } } proc scrollLeave canvas { global oldFill set id [$canvas find withtag current] if {[lsearch [$canvas gettags current] text] >= 0} { set id [expr {$id-1}] } $canvas itemconfigure $id -fill $oldFill $canvas itemconfigure [expr {$id+1}] -fill black } proc scrollButton canvas { global oldFill set id [$canvas find withtag current] if {[lsearch [$canvas gettags current] text] < 0} { set id [expr {$id+1}] } puts stdout "You buttoned at [lindex [$canvas itemconf $id -text] 4]" }