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markom |
# cscroll.tcl --
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#
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# This demonstration script creates a simple canvas that can be
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# scrolled in two dimensions.
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#
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# SCCS: @(#) cscroll.tcl 1.6 97/03/02 16:20:45
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if {![info exists widgetDemo]} {
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error "This script should be run from the \"widget\" demo."
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}
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set w .cscroll
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catch {destroy $w}
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toplevel $w
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wm title $w "Scrollable Canvas Demonstration"
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wm iconname $w "cscroll"
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positionWindow $w
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set c $w.c
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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."
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pack $w.msg -side top
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frame $w.buttons
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pack $w.buttons -side bottom -fill x -pady 2m
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button $w.buttons.dismiss -text Dismiss -command "destroy $w"
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button $w.buttons.code -text "See Code" -command "showCode $w"
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pack $w.buttons.dismiss $w.buttons.code -side left -expand 1
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frame $w.grid
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scrollbar $w.hscroll -orient horiz -command "$c xview"
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scrollbar $w.vscroll -command "$c yview"
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canvas $c -relief sunken -borderwidth 2 -scrollregion {-11c -11c 50c 20c} \
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-xscrollcommand "$w.hscroll set" \
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-yscrollcommand "$w.vscroll set"
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pack $w.grid -expand yes -fill both -padx 1 -pady 1
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grid rowconfig $w.grid 0 -weight 1 -minsize 0
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grid columnconfig $w.grid 0 -weight 1 -minsize 0
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grid $c -padx 1 -in $w.grid -pady 1 \
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-row 0 -column 0 -rowspan 1 -columnspan 1 -sticky news
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grid $w.vscroll -in $w.grid -padx 1 -pady 1 \
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-row 0 -column 1 -rowspan 1 -columnspan 1 -sticky news
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grid $w.hscroll -in $w.grid -padx 1 -pady 1 \
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-row 1 -column 0 -rowspan 1 -columnspan 1 -sticky news
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set bg [lindex [$c config -bg] 4]
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for {set i 0} {$i < 20} {incr i} {
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set x [expr {-10 + 3*$i}]
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for {set j 0; set y -10} {$j < 10} {incr j; incr y 3} {
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$c create rect ${x}c ${y}c [expr $x+2]c [expr $y+2]c \
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-outline black -fill $bg -tags rect
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$c create text [expr $x+1]c [expr $y+1]c -text "$i,$j" \
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-anchor center -tags text
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}
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}
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$c bind all <Any-Enter> "scrollEnter $c"
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$c bind all <Any-Leave> "scrollLeave $c"
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$c bind all <1> "scrollButton $c"
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bind $c <2> "$c scan mark %x %y"
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bind $c <B2-Motion> "$c scan dragto %x %y"
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proc scrollEnter canvas {
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global oldFill
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set id [$canvas find withtag current]
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if {[lsearch [$canvas gettags current] text] >= 0} {
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set id [expr $id-1]
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}
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set oldFill [lindex [$canvas itemconfig $id -fill] 4]
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if {[winfo depth $canvas] > 1} {
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$canvas itemconfigure $id -fill SeaGreen1
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} else {
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$canvas itemconfigure $id -fill black
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$canvas itemconfigure [expr $id+1] -fill white
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}
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}
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proc scrollLeave canvas {
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global oldFill
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set id [$canvas find withtag current]
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if {[lsearch [$canvas gettags current] text] >= 0} {
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set id [expr $id-1]
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}
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$canvas itemconfigure $id -fill $oldFill
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$canvas itemconfigure [expr $id+1] -fill black
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}
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proc scrollButton canvas {
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global oldFill
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set id [$canvas find withtag current]
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if {[lsearch [$canvas gettags current] text] < 0} {
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set id [expr $id+1]
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}
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puts stdout "You buttoned at [lindex [$canvas itemconf $id -text] 4]"
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}
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