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-
-
- sub scroll_enter {
-
- my($c) = @_;
-
- my $id = $c->find('withtag', 'current');
- $id-- if ($c->gettags('current'))[0] eq 'text';
- $mkScroll::old_fill = ($c->itemconfigure($id, -fill))[4];
- if ($mkScroll->depth > 1) {
- $c->itemconfigure($id, -fill => 'SeaGreen1');
- } else {
- $c->itemconfigure($id, -fill => 'black');
- $c->itemconfigure($id+1, -fill => 'white');
- }
-
- } # end scroll_enter
-
-
- sub scroll_leave {
-
- my($c) = @_;
-
- my $id = $c->find('withtag', 'current');
- $id-- if ($c->gettags('current'))[0] eq 'text';
- $c->itemconfigure($id, -fill => $mkScroll::old_fill);
- $c->itemconfigure($id+1, -fill => 'black');
-
- } # end scroll_leave
-
-
- sub scroll_button {
-
- my($c) = @_;
-
- my $id = $c->find('withtag', 'current');
- $id++ if ($c->gettags('current'))[0] ne 'text';
- print STDOUT 'You buttoned at ', ($c->itemconfigure($id, -text))[4], "\n";
-
- } # end scroll_button
-
- sub mkScroll {
-
- # Create a top-level window containing a simple canvas that can be scrolled in two dimensions.
-
- $mkScroll->destroy if Exists($mkScroll);
- $mkScroll = $top->Toplevel();
- my $w = $mkScroll;
- dpos $w;
- $w->title('Scrollable Canvas Demonstration');
- $w->iconname('Canvas');
- $w->minsize(100, 100);
-
- my $w_msg = $w->Label(-font => '-Adobe-Times-Medium-R-Normal--*-180-*-*-*-*-*-*', -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.');
- my $w_frame = $w->Frame();
- my $w_ok = $w->Button(-text => 'OK', -width => 8, -command => ['destroy', $w]);
- $w_msg->pack(-side => 'top', -fill => 'x');
- $w_ok->pack(-side => 'bottom', -pady => '5');
- $w_frame->pack(-side => 'top', -expand => 'yes', -fill => 'both');
-
- my $c = $w_frame->Canvas(-relief => 'sunken', -bd => 2, -scrollregion => ['-10c', '-10c', '50c', '20c']);
- my $w_frame_vscroll = $w_frame->Scrollbar(-command => ['yview', $c]);
- my $w_frame_hscroll = $w_frame->Scrollbar(-command => ['xview', $c], -orient => 'horiz');
- $c->configure(-xscrollcommand => ['set', $w_frame_hscroll], -yscrollcommand => ['set', $w_frame_vscroll]);
- $w_frame_vscroll->pack(-side => 'right', -fill => 'y');
- $w_frame_hscroll->pack(-side => 'bottom', -fill => 'x');
- $c->pack(-expand => 'yes', -fill => 'both');
-
- my($bg, $i, $j, $x, $y) = ($c->configure(-background))[4];
- for ($i = 0; $i < 20; $i++) {
- $x = -10 + 3 * $i;
- $j = 0;
- $y = -10;
- while ($j < 10) {
- $c->create('rectangle', sprintf("%dc", $x), sprintf("%dc", $y), sprintf("%dc", $x+2), sprintf("%dc", $y+2),
- -outline => 'black', -fill => $bg, -tags => 'rect');
- $c->create('text', sprintf("%dc", $x+1), sprintf("%dc", $y+1), -text => "$i,$j", -anchor => 'center',
- -tags => 'text');
- $j++;
- $y += 3;
- } # whilend
- } # forend
-
- $c->bind('all', '<Any-Enter>' => sub {scroll_enter(@_)});
- $c->bind('all', '<Any-Leave>' => sub {scroll_leave(@_)});
- $c->bind('all', '<1>' => sub {scroll_button(@_)});
- $c->Tk::bind('<2>' => sub {
- my ($c) = @_;
- my $e = $c->XEvent;
- $c->scan('mark', $e->x, $e->y);
- });
- $c->Tk::bind('<B2-Motion>' => sub {
- my ($c) = @_;
- my $e = $c->XEvent;
- $c->scan('dragto', $e->x, $e->y);
- });
-
- } # end MkScroll
-
- 1;
-