Initial revision

1 files changed, 96 insertions, 0 deletions

diff --git a/library/demos/cscroll.tcl b/library/demos/cscroll.tcl
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+# cscroll.tcl --
+#
+# This demonstration script creates a simple canvas that can be
+# scrolled in two dimensions.
+#
+# SCCS: @(#) cscroll.tcl 1.6 97/03/02 16:20:45
+
+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]"
+}