--- /dev/null
+# cscroll.tcl --
+#
+# This demonstration script creates a simple canvas that can be
+# scrolled in two dimensions.
+
+if {![info exists widgetDemo]} {
+ error "This script should be run from the \"widget\" demo."
+}
+
+package require Tk
+
+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
+
+## See Code / Dismiss buttons
+set btns [addSeeDismiss $w.buttons $w]
+pack $btns -side bottom -fill x
+
+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 \
+ -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 <Enter> "scrollEnter $c"
+$c bind all <Leave> "scrollLeave $c"
+$c bind all <Button-1> "scrollButton $c"
+if {([tk windowingsystem] eq "aqua") && ![package vsatisfies [package provide Tk] 8.7-]} {
+ bind $c <Button-3> "$c scan mark %x %y"
+ bind $c <B3-Motion> "$c scan dragto %x %y"
+ 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
+ }
+} else {
+ bind $c <Button-2> "$c scan mark %x %y"
+ bind $c <B2-Motion> "$c scan dragto %x %y"
+ # We must make sure that positive and negative movements are rounded
+ # equally to integers, avoiding the problem that
+ # (int)1/-30 = -1,
+ # but
+ # (int)-1/-30 = 0
+ # The following code ensure equal +/- behaviour.
+ bind $c <MouseWheel> {
+ if {%D >= 0} {
+ %W yview scroll [expr {%D/-30}] units
+ } else {
+ %W yview scroll [expr {(%D-29)/-30}] units
+ }
+ }
+ bind $c <Option-MouseWheel> {
+ if {%D >= 0} {
+ %W yview scroll [expr {%D/-3}] units
+ } else {
+ %W yview scroll [expr {(%D-2)/-3}] units
+ }
+ }
+ bind $c <Shift-MouseWheel> {
+ if {%D >= 0} {
+ %W xview scroll [expr {%D/-30}] units
+ } else {
+ %W xview scroll [expr {(%D-29)/-30}] units
+ }
+ }
+ bind $c <Shift-Option-MouseWheel> {
+ if {%D >= 0} {
+ %W xview scroll [expr {%D/-3}] units
+ } else {
+ %W xview scroll [expr {(%D-2)/-3}] units
+ }
+ }
+}
+
+if {[tk windowingsystem] eq "x11" && ![package vsatisfies [package provide Tk] 8.7-]} {
+ # Support for mousewheels on Linux/Unix commonly comes through mapping
+ # the wheel to the extended buttons. If you have a mousewheel, find
+ # Linux configuration info at:
+ # https://linuxreviews.org/HOWTO_change_the_mouse_speed_in_X
+ bind $c <Button-4> {
+ if {!$tk_strictMotif} {
+ %W yview scroll -5 units
+ }
+ }
+ bind $c <Shift-Button-4> {
+ if {!$tk_strictMotif} {
+ %W xview scroll -5 units
+ }
+ }
+ bind $c <Button-5> {
+ if {!$tk_strictMotif} {
+ %W yview scroll 5 units
+ }
+ }
+ bind $c <Shift-Button-5> {
+ if {!$tk_strictMotif} {
+ %W xview scroll 5 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} {
+ if {[tk windowingsystem] eq "aqua"} {
+ $canvas itemconfigure $id -fill systemSelectedTextBackgroundColor
+ } else {
+ $canvas itemconfigure $id -fill LightSeaGreen
+ }
+ }
+}
+
+proc scrollLeave canvas {
+ global oldFill
+ set id [$canvas find withtag current]
+ if {[lsearch [$canvas gettags current] text] >= 0} {
+ set id [expr {$id-1}]
+ }
+ $canvas itemconfigure $id -fill $oldFill
+}
+
+proc scrollButton canvas {
+ set id [$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]"
+}
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