| # cscroll.tcl -- |
| # |
| # This demonstration script creates a simple canvas that can be |
| # scrolled in two dimensions. |
| # |
| # RCS: @(#) $Id: cscroll.tcl,v 1.3 2001/06/14 10:56:58 dkf 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 <Any-Enter> "scrollEnter $c" |
| $c bind all <Any-Leave> "scrollLeave $c" |
| $c bind all <1> "scrollButton $c" |
| bind $c <2> "$c scan mark %x %y" |
| bind $c <B2-Motion> "$c scan dragto %x %y" |
| |
| 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]" |
| } |