Commit | Line | Data |
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920dae64 AT |
1 | # cscroll.tcl -- |
2 | # | |
3 | # This demonstration script creates a simple canvas that can be | |
4 | # scrolled in two dimensions. | |
5 | # | |
6 | # RCS: @(#) $Id: cscroll.tcl,v 1.3 2001/06/14 10:56:58 dkf Exp $ | |
7 | ||
8 | if {![info exists widgetDemo]} { | |
9 | error "This script should be run from the \"widget\" demo." | |
10 | } | |
11 | ||
12 | set w .cscroll | |
13 | catch {destroy $w} | |
14 | toplevel $w | |
15 | wm title $w "Scrollable Canvas Demonstration" | |
16 | wm iconname $w "cscroll" | |
17 | positionWindow $w | |
18 | set c $w.c | |
19 | ||
20 | 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." | |
21 | pack $w.msg -side top | |
22 | ||
23 | frame $w.buttons | |
24 | pack $w.buttons -side bottom -fill x -pady 2m | |
25 | button $w.buttons.dismiss -text Dismiss -command "destroy $w" | |
26 | button $w.buttons.code -text "See Code" -command "showCode $w" | |
27 | pack $w.buttons.dismiss $w.buttons.code -side left -expand 1 | |
28 | ||
29 | frame $w.grid | |
30 | scrollbar $w.hscroll -orient horiz -command "$c xview" | |
31 | scrollbar $w.vscroll -command "$c yview" | |
32 | canvas $c -relief sunken -borderwidth 2 -scrollregion {-11c -11c 50c 20c} \ | |
33 | -xscrollcommand "$w.hscroll set" \ | |
34 | -yscrollcommand "$w.vscroll set" | |
35 | pack $w.grid -expand yes -fill both -padx 1 -pady 1 | |
36 | grid rowconfig $w.grid 0 -weight 1 -minsize 0 | |
37 | grid columnconfig $w.grid 0 -weight 1 -minsize 0 | |
38 | ||
39 | grid $c -padx 1 -in $w.grid -pady 1 \ | |
40 | -row 0 -column 0 -rowspan 1 -columnspan 1 -sticky news | |
41 | grid $w.vscroll -in $w.grid -padx 1 -pady 1 \ | |
42 | -row 0 -column 1 -rowspan 1 -columnspan 1 -sticky news | |
43 | grid $w.hscroll -in $w.grid -padx 1 -pady 1 \ | |
44 | -row 1 -column 0 -rowspan 1 -columnspan 1 -sticky news | |
45 | ||
46 | ||
47 | set bg [lindex [$c config -bg] 4] | |
48 | for {set i 0} {$i < 20} {incr i} { | |
49 | set x [expr {-10 + 3*$i}] | |
50 | for {set j 0; set y -10} {$j < 10} {incr j; incr y 3} { | |
51 | $c create rect ${x}c ${y}c [expr {$x+2}]c [expr {$y+2}]c \ | |
52 | -outline black -fill $bg -tags rect | |
53 | $c create text [expr {$x+1}]c [expr {$y+1}]c -text "$i,$j" \ | |
54 | -anchor center -tags text | |
55 | } | |
56 | } | |
57 | ||
58 | $c bind all <Any-Enter> "scrollEnter $c" | |
59 | $c bind all <Any-Leave> "scrollLeave $c" | |
60 | $c bind all <1> "scrollButton $c" | |
61 | bind $c <2> "$c scan mark %x %y" | |
62 | bind $c <B2-Motion> "$c scan dragto %x %y" | |
63 | ||
64 | proc scrollEnter canvas { | |
65 | global oldFill | |
66 | set id [$canvas find withtag current] | |
67 | if {[lsearch [$canvas gettags current] text] >= 0} { | |
68 | set id [expr {$id-1}] | |
69 | } | |
70 | set oldFill [lindex [$canvas itemconfig $id -fill] 4] | |
71 | if {[winfo depth $canvas] > 1} { | |
72 | $canvas itemconfigure $id -fill SeaGreen1 | |
73 | } else { | |
74 | $canvas itemconfigure $id -fill black | |
75 | $canvas itemconfigure [expr {$id+1}] -fill white | |
76 | } | |
77 | } | |
78 | ||
79 | proc scrollLeave canvas { | |
80 | global oldFill | |
81 | set id [$canvas find withtag current] | |
82 | if {[lsearch [$canvas gettags current] text] >= 0} { | |
83 | set id [expr {$id-1}] | |
84 | } | |
85 | $canvas itemconfigure $id -fill $oldFill | |
86 | $canvas itemconfigure [expr {$id+1}] -fill black | |
87 | } | |
88 | ||
89 | proc scrollButton canvas { | |
90 | global oldFill | |
91 | set id [$canvas find withtag current] | |
92 | if {[lsearch [$canvas gettags current] text] < 0} { | |
93 | set id [expr {$id+1}] | |
94 | } | |
95 | puts stdout "You buttoned at [lindex [$canvas itemconf $id -text] 4]" | |
96 | } |