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- # Converted from scale.tcl --
- #
- # This file defines the default bindings for Tk scale widgets.
- #
- # @(#) scale.tcl 1.3 94/12/17 16:05:23
- #
- # Copyright (c) 1994 The Regents of the University of California.
- # Copyright (c) 1994 Sun Microsystems, Inc.
- #
- # See the file "license.terms" for information on usage and redistribution
- # of this file, and for a DISCLAIMER OF ALL WARRANTIES.
-
- package Tk::Scale;
- require Tk;
- use AutoLoader;
- @ISA = qw(Tk::Widget);
-
- Construct Tk::Widget 'Scale';
-
- bootstrap Tk::Scale $Tk::VERSION;
-
- sub Tk_cmd { \&Tk::scale }
-
-
- import Tk qw(Ev);
-
- #
- # Bind --
- # This procedure below invoked the first time the mouse enters a
- # scale widget or a scale widget receives the input focus. It creates
- # all of the class bindings for scales.
- #
- # Arguments:
- # event - Indicates which event caused the procedure to be invoked
- # (Enter or FocusIn). It is used so that we can carry out
- # the functions of that event in addition to setting up
- # bindings.
- sub ClassInit
- {
- my ($class,$mw) = @_;
-
- $mw->bind($class,"<Enter>",['Enter',Ev('x'),Ev('y')]);
- $mw->bind($class,"<Motion>",['Activate',Ev('x'),Ev('y')]);
- $mw->bind($class,"<Leave>",'Leave');
-
- $mw->bind($class,"<1>",['ButtonDown',Ev('x'),Ev('y')]);
- $mw->bind($class,"<B1-Motion>",['Drag',Ev('x'),Ev('y')]);
- $mw->bind($class,"<B1-Leave>",'NoOp');
- $mw->bind($class,"<B1-Enter>",'NoOp');
- $mw->bind($class,"<ButtonRelease-1>",['ButtonUp',Ev('x'),Ev('y')]);
-
- $mw->bind($class,"<2>",['ButtonDown',Ev('x'),Ev('y')]);
- $mw->bind($class,"<B2-Motion>",['Drag',Ev('x'),Ev('y')]);
- $mw->bind($class,"<B2-Leave>",'NoOp');
- $mw->bind($class,"<B2-Enter>",'NoOp');
- $mw->bind($class,"<ButtonRelease-2>",['ButtonUp',Ev('x'),Ev('y')]);
-
- $mw->bind($class,"<Control-1>",['ControlPress',Ev('x'),Ev('y')]);
-
- $mw->bind($class,"<Up>",['Increment',"up","little","noRepeat"]);
- $mw->bind($class,"<Down>",['Increment',"down","little","noRepeat"]);
- $mw->bind($class,"<Left>",['Increment',"up","little","noRepeat"]);
- $mw->bind($class,"<Right>",['Increment',"down","little","noRepeat"]);
-
- $mw->bind($class,"<Control-Up>",['Increment',"up","big","noRepeat"]);
- $mw->bind($class,"<Control-Down>",['Increment',"down","big","noRepeat"]);
- $mw->bind($class,"<Control-Left>",['Increment',"up","big","noRepeat"]);
- $mw->bind($class,"<Control-Right>",['Increment',"down","big","noRepeat"]);
-
- $mw->bind($class,"<Home>",["set",Ev("cget","-from")]);
- $mw->bind($class,"<End>",["set",Ev("cget","-to")]);
- return $class;
- }
-
- 1;
-
- __END__
-
- # Activate --
- # This procedure is invoked to check a given x-y position in the
- # scale and activate the slider if the x-y position falls within
- # the slider.
- #
- # Arguments:
- # w - The scale widget.
- # x, y - Mouse coordinates.
- sub Activate
- {
- my $w = shift;
- my $x = shift;
- my $y = shift;
- return if ($w->cget("-state") eq "disabled");
- my $ident = $w->identify($x,$y);
- if (defined($ident) && $ident eq 'slider')
- {
- $w->configure(-state => "active")
- }
- else
- {
- $w->configure(-state => "normal")
- }
- }
-
- sub Leave
- {
- my ($w) = @_;
- $w->configure("-activebackground",$w->{'activeBg'}) if ($Tk::strictMotif);
- $w->configure("-state","normal") if ($w->cget("-state") eq "active");
- }
-
- sub Enter
- {
- my ($w,$x,$y) = @_;
- if ($Tk::strictMotif)
- {
- $w->{'activeBg'} = $w->cget("-activebackground");
- $w->configure("-activebackground",$w->cget("-background"));
- }
- $w->Activate($x,$y);
- }
-
- sub ButtonUp
- {
- my ($w,$x,$y) = @_;
- $w->CancelRepeat();
- $w->EndDrag();
- $w->Activate($x,$y)
- }
-
-
- # ButtonDown --
- # This procedure is invoked when a button is pressed in a scale. It
- # takes different actions depending on where the button was pressed.
- #
- # Arguments:
- # w - The scale widget.
- # x, y - Mouse coordinates of button press.
- sub ButtonDown
- {
- my $w = shift;
- my $x = shift;
- my $y = shift;
- $Tk::dragging = 0;
- $el = $w->identify($x,$y);
- return unless ($el);
- if ($el eq "trough1")
- {
- $w->Increment("up","little","initial")
- }
- elsif ($el eq "trough2")
- {
- $w->Increment("down","little","initial")
- }
- elsif ($el eq "slider")
- {
- $Tk::dragging = 1;
- my @coords = $w->coords();
- $Tk::deltaX = $x-$coords[0];
- $Tk::deltaY = $y-$coords[1];
- }
- }
- # Drag --
- # This procedure is called when the mouse is dragged with
- # mouse button 1 down. If the drag started inside the slider
- # (i.e. the scale is active) then the scale's value is adjusted
- # to reflect the mouse's position.
- #
- # Arguments:
- # w - The scale widget.
- # x, y - Mouse coordinates.
- sub Drag
- {
- my $w = shift;
- my $x = shift;
- my $y = shift;
- if (!$Tk::dragging)
- {
- return;
- }
- $w->set($w->get($x-$Tk::deltaX,$y-$Tk::deltaY))
- }
- # EndDrag --
- # This procedure is called to end an interactive drag of the
- # slider. It just marks the drag as over.
- # Arguments:
- # w - The scale widget.
- sub EndDrag
- {
- my $w = shift;
- if (!$Tk::dragging)
- {
- return;
- }
- $Tk::dragging = 0;
- }
- # Increment --
- # This procedure is invoked to increment the value of a scale and
- # to set up auto-repeating of the action if that is desired. The
- # way the value is incremented depends on the "dir" and "big"
- # arguments.
- #
- # Arguments:
- # w - The scale widget.
- # dir - "up" means move value towards -from, "down" means
- # move towards -to.
- # big - Size of increments: "big" or "little".
- # repeat - Whether and how to auto-repeat the action: "noRepeat"
- # means don't auto-repeat, "initial" means this is the
- # first action in an auto-repeat sequence, and "again"
- # means this is the second repetition or later.
- sub Increment
- {
- my $w = shift;
- my $dir = shift;
- my $big = shift;
- my $repeat = shift;
- my $inc;
- if ($big eq "big")
- {
- $inc = $w->cget("-bigincrement");
- if ($inc == 0)
- {
- $inc = abs(($w->cget("-to")-$w->cget("-from")))/10.0
- }
- if ($inc < $w->cget("-resolution"))
- {
- $inc = $w->cget("-resolution")
- }
- }
- else
- {
- $inc = $w->cget("-resolution")
- }
- if (($w->cget("-from") > $w->cget("-to")) ^ ($dir eq "up"))
- {
- $inc = -$inc
- }
- $w->set($w->get()+$inc);
- if ($repeat eq "again")
- {
- $w->RepeatId($w->after($w->cget("-repeatinterval"),"Increment",$w,$dir,$big,"again"));
- }
- elsif ($repeat eq "initial")
- {
- $w->RepeatId($w->after($w->cget("-repeatdelay"),"Increment",$w,$dir,$big,"again"));
- }
- }
- # ControlPress --
- # This procedure handles button presses that are made with the Control
- # key down. Depending on the mouse position, it adjusts the scale
- # value to one end of the range or the other.
- #
- # Arguments:
- # w - The scale widget.
- # x, y - Mouse coordinates where the button was pressed.
- sub ControlPress
- {
- my ($w,$x,$y) = @_;
- my $el = $w->identify($x,$y);
- return unless ($el);
- if ($el eq "trough1")
- {
- $w->set($w->cget("-from"))
- }
- elsif ($el eq "trough2")
- {
- $w->set($w->cget("-to"))
- }
- }
-
-
-