#!/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("Resize me"); $window->signal_connect( delete_event => sub { exit } ); $window->set_border_width(5); my $scaled= Gtk2::Ex::ScaleBin->new; my $entry=Gtk2::Entry->new; my $button=Gtk2::Button->new_from_stock('gtk-ok'); $button->signal_connect(clicked=>sub {warn "clicked\n";}); my $vbox=Gtk2::VBox->new; $vbox->add($entry); $vbox->add($button); $scaled->add($vbox); $window->add($scaled); $window->show_all; Gtk2->main; package Gtk2::Ex::ScaleBin; use Gtk2; use Glib::Object::Subclass Gtk2::EventBox::, signals => { size_allocate => \&do_size_allocate, }; 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 $self; } sub do_size_allocate { my ($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 $self->window; my ($reqw,$reqh)= ($w,$h); if (my $child=$self->child) { my $req= $child->size_request; $reqw= $req->width; $reqh= $req->height; my $rect=Gtk2::Gdk::Rectangle->new(0, 0, $reqw, $reqh); $self->child->size_allocate($rect); } $self->{zoom_x}= $w / $reqw; $self->{zoom_y}= $h / $reqh; if (my $offscreen= $self->{offscreen}) { $offscreen->{zoom_x}= $self->{zoom_x}; $offscreen->{zoom_y}= $self->{zoom_y}; $offscreen->move_resize(0,0, $reqw, $reqh); $offscreen->geometry_changed; } } sub damage_cb { my ($self,$event)=@_; my ($x,$y,$w,$h)=$event->area->values; my $zx= $self->{zoom_x}; my $zy= $self->{zoom_y}; my $rect=Gtk2::Gdk::Rectangle->new($x*$zx, $y*$zy, $w*$zx, $h*$zy); $self->window->invalidate_rect($rect,0); 1; } sub realize_cb { my ($self)=@_; my ($x,$y,$w,$h)=$self->allocation->values; my %attr= ( window_type => 'offscreen', wclass => 'output', x => 0, y => 0, width => $w, height => $h, 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->{zoom_x}= $self->{zoom_x}; $offscreen->{zoom_y}= $self->{zoom_y}; $offscreen->signal_connect( to_embedder => sub {my ($offscreen,$x,$y)=@_; return $x*$offscreen->{zoom_x},$y*$offscreen->{zoom_y} }); $offscreen->signal_connect( from_embedder=> sub {my ($offscreen,$x,$y)=@_; return $x/$offscreen->{zoom_x},$y/$offscreen->{zoom_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 $pixmap; my ($w,$h)= $pixmap->get_size; my $cr=Gtk2::Gdk::Cairo::Context->create($self->window); $cr->rectangle($event->area); $cr->clip; $cr->scale($self->{zoom_x},$self->{zoom_y}); $cr->set_source_pixmap($pixmap,0,0); $cr->paint; } elsif ($event->window == $offscreen) { $self->propagate_expose($self->child,$event) if $self->child; } 1; }