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# You may distribute under the terms of either the GNU General Public License
# or the Artistic License (the same terms as Perl itself)
#
# (C) Paul Evans, 2013-2023 -- leonerd@leonerd.org.uk
use v5.20;
use warnings;
use Object::Pad 0.807 ':experimental(inherit_field)';
package Tickit::Widget::LinearSplit 0.42;
class Tickit::Widget::LinearSplit :strict(params);
inherit Tickit::ContainerWidget;
use Tickit::Window 0.32; # needs drag_start
use Carp;
field $_split_fraction = 0.5;
field $_A_child :reader;
field $_B_child :reader;
field $_split_at :inheritable;
field $_split_len :inheritable;
method set_A_child
{
my ( $child ) = @_;
$self->remove( $_A_child ) if $_A_child;
$self->add( $_A_child = $child );
return $self;
}
method set_B_child
{
my ( $child ) = @_;
$self->remove( $_B_child ) if $_B_child;
$self->add( $_B_child = $child );
return $self;
}
method children
{
return grep { defined } $_A_child, $_B_child;
}
method child_resized
{
# TODO: should handle minimums at least
}
## This should come from ContainerWidget
method children_changed
{
$self->reshape if $self->window;
$self->resized;
}
##
method reshape
{
my $win = $self->window or return;
my $spacing = $self->get_style_values( "spacing" );
my $method = $self->VALUE_METHOD;
my $quota = $win->$method - $spacing;
my $want_split_at = int( $quota * $_split_fraction + 0.5 ); # round to nearest
# Enforce child minimum sizes
if( my $child = $_B_child ) {
my $max = $quota - $child->$method;
$want_split_at = $max if $want_split_at > $max;
}
if( my $child = $_A_child ) {
my $min = $child->$method;
$want_split_at = $min if $want_split_at < $min;
}
my $A_value = $want_split_at;
my $B_value = $quota - $want_split_at;
my @A_geom = $self->_make_child_geom( 0, $A_value );
my @B_geom = $self->_make_child_geom( $A_value + $spacing, $B_value );
if( my $child = $_A_child ) {
if( $A_value > 0 ) {
if( my $childwin = $child->window ) {
$childwin->change_geometry( @A_geom );
}
else {
$child->set_window( $win->make_sub( @A_geom ) );
}
}
else {
$child->set_window( undef );
}
}
if( my $child = $_B_child ) {
if( $B_value > 0 ) {
if( my $childwin = $child->window ) {
$childwin->change_geometry( @B_geom );
}
else {
$child->set_window( $win->make_sub( @B_geom ) );
}
}
else {
$child->set_window( undef );
}
}
$_split_at = $A_value;
$_split_len = $spacing;
}
field $_drag_mouse_offset;
method _on_mouse
{
my ( $ev, $val ) = @_;
my $val0 = $val - $_split_at;
my $in_split = $val0 >= 0 && $val0 < $_split_len;
if( $ev eq "press" ) {
$self->set_style_tag( active => 1 ) if $in_split;
}
elsif( $ev eq "drag_start" ) {
return unless $in_split;
$_drag_mouse_offset = $val0;
return 1;
}
elsif( $ev eq "drag" ) {
return unless defined $_drag_mouse_offset;
my $method = $self->VALUE_METHOD;
my $quota = $self->window->$method - $_split_len;
my $want_split_at = $val - $_drag_mouse_offset;
$_split_fraction = $want_split_at / $quota;
$self->reshape;
$self->redraw;
}
elsif( $ev eq "drag_drop" ) {
undef $_drag_mouse_offset;
}
elsif( $ev eq "release" ) {
$self->set_style_tag( active => 0 ) if $in_split;
}
}
0x55AA;
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