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|
#!/usr/bin/perl
use strict;
use warnings;
use Glib qw(TRUE FALSE);
use Gtk2 '-init';
use Cairo;
my $window = Gtk2::Window->new;
$window->set_title("Reflection example");
$window->signal_connect( delete_event => sub { exit } );
$window->set_border_width(10);
my $reflected= Gtk2::Ex::ReflectBin->new;
my $entry=Gtk2::Entry->new;
my $button1=Gtk2::Button->new;
$button1->add( Gtk2::Image->new_from_stock('gtk-go-back','button') );
$button1->signal_connect(clicked=>sub {warn "button 1 clicked\n";});
my $button2=Gtk2::Button->new;
$button2->add( Gtk2::Image->new_from_stock('gtk-apply','button') );
$button2->signal_connect(clicked=>sub {warn "button 2 clicked\n";});
my $hbox=Gtk2::HBox->new;
$hbox->pack_start($button1,FALSE,FALSE,2);
$hbox->add($entry);
$hbox->pack_start($button2,FALSE,FALSE,2);
$reflected->add($hbox);
$window->add($reflected);
$window->show_all;
Gtk2->main;
package Gtk2::Ex::ReflectBin;
use Gtk2;
use Glib::Object::Subclass
Gtk2::EventBox::,
signals =>
{ size_allocate => \&do_size_allocate,
size_request => \&do_size_request,
};
sub INIT_INSTANCE {
my $self=shift;
$self->signal_connect( expose_event => \&expose_cb);
$self->signal_connect( damage_event => \&damage_cb);
$self->signal_connect( realize => \&realize_cb);
return $self;
}
sub do_size_request {
my ($self,$req)=@_;
my $border= $self->get_border_width;
return unless $self->child;
my $child_req=$self->child->size_request;
my $w= $child_req->width;
my $h= $child_req->height;
$req->width( $w +$border*2 );
$req->height( $h*2 +$border*2 );
}
sub do_size_allocate {
my ($self,$alloc)=@_;
my $border= $self->get_border_width;
my ($x,$y,$w,$h)=$alloc->values;
my $olda=$self->allocation;
$olda->x($x); $olda->width($w);
$olda->y($y); $olda->height($h);
$w-= 2*$border;
$h-= 2*$border;
$self->window->move_resize($x+$border,$y+$border,$w,$h) if $self->window;
if (my $child=$self->child) {
my $req= $child->size_request;
my $rect=Gtk2::Gdk::Rectangle->new(0,0,$w,$h/2);
$self->child->size_allocate($rect);
}
if (my $offscreen= $self->{offscreen}) {
$offscreen->move_resize(0,0,$w,$h/2);
$offscreen->geometry_changed;
}
}
sub damage_cb {
my ($self,$event)=@_;
# invalidate the whole window, it could be better to invalidate $event->area and the rectangle containing its reflection
$self->window->invalidate_rect(undef,0);
return 1;
}
sub realize_cb {
my ($self)=@_;
my $border= $self->get_border_width;
my ($x,$y,$w,$h)=$self->allocation->values;
my %attr=
( window_type => 'offscreen',
wclass => 'output',
x => 0,
y => 0,
width => $w-$border*2,
height => ($h-$border*2)/2,
event_mask => [qw/pointer-motion-mask button-press-mask button-release-mask exposure_mask/],
);
$self->{offscreen}= my $offscreen= Gtk2::Gdk::Window->new($self->get_root_window,\%attr);
$offscreen->set_user_data($self->Glib::Object::get_pointer());
$self->window->signal_connect( pick_embedded_child =>sub { return $offscreen; });
$self->child->set_parent_window($offscreen) if $self->child;
$offscreen->set_embedder($self->window);
$offscreen->signal_connect( to_embedder => sub {my ($offscreen,$x,$y)=@_; return $x,$y });
$offscreen->signal_connect( from_embedder=> sub {my ($offscreen,$x,$y)=@_; return $x,$y });
$self->style->set_background($offscreen,'normal');
$offscreen->show;
}
sub expose_cb {
my ($self,$event)=@_;
my $offscreen= $self->{offscreen};
if ($event->window == $self->window) {
my $pixmap = $offscreen->get_pixmap;
return 1 unless $pixmap && $self->child;
my (undef,$height)= $pixmap->get_size;
my $cr=Gtk2::Gdk::Cairo::Context->create($self->window);
my $child_alloc= $self->child->allocation;
$cr->rectangle($event->area);
$cr->clip;
$cr->save; # the above clip is used for both draw
# draw normal version on upper half (0..$height)
$cr->rectangle($child_alloc);
$cr->clip;
$cr->set_source_pixmap($pixmap,0,0);
$cr->paint;
$cr->restore;
# draw reflection on lower half ($height..$height*2)
my $mask= Cairo::LinearGradient->create(0,$height,0,$height*2);
$mask->add_color_stop_rgba(0, 0, 0, 0, 1 );
$mask->add_color_stop_rgba(0.25, 0, 0, 0, 0.5 );
$mask->add_color_stop_rgba(0.5, 0, 0, 0, 0.25);
$mask->add_color_stop_rgba(0.75, 0, 0, 0, 0.1 );
$mask->add_color_stop_rgba(1.0, 0, 0, 0, 0 );
my $matrix= Cairo::Matrix->init(1, 0, .3, 1, 0, 0);
$matrix->translate(-10,$height*2);
$matrix->scale(1,-1);
$cr->transform($matrix);
$mask->set_matrix($matrix);
$cr->rectangle($child_alloc);
$cr->clip;
$cr->set_source_pixmap($pixmap,0,0);
$cr->mask($mask);
}
elsif ($event->window == $offscreen) {
$self->propagate_expose($self->child,$event) if $self->child;
}
1;
}
|
