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- # 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 <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"
- if {[tk windowingsystem] eq "aqua"} {
- bind $c <MouseWheel> {
- %W yview scroll [expr {- (%D)}] units
- }
- bind $c <Option-MouseWheel> {
- %W yview scroll [expr {-10 * (%D)}] units
- }
- bind $c <Shift-MouseWheel> {
- %W xview scroll [expr {- (%D)}] units
- }
- bind $c <Shift-Option-MouseWheel> {
- %W xview scroll [expr {-10 * (%D)}] units
- }
- }
- proc scrollEnter canvas {
- global oldFill
- set id [$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]"
- }
