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#!/usr/bin/env ruby
#
# This sample code is a port of clutter/examples/pan-action.c. The
# image file used in this sample code is copied from
# clutter/tests/data/redhand.png. They are licensed under the terms
# of the GNU Lesser General Public License, version 2.1 or (at your
# option) later.
#
# Copyright (C) 2013 Ruby-GNOME2 Project Team
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
require "clutter"
require "gdk_pixbuf2"
stage = Clutter::Stage.new
stage.name = "Pan Action"
stage.user_resizable = true
scroll = Clutter::Actor.new
scroll.name = "scroll"
scroll.add_constraint(Clutter::AlignConstraint.new(stage, :x_axis, 0))
scroll.add_constraint(Clutter::BindConstraint.new(stage, :size, 0))
content = Clutter::Actor.new
content.set_size(720, 720)
pixbuf = GdkPixbuf::Pixbuf.new(:file => File.expand_path("redhand.png", File.dirname(__FILE__)))
image = Clutter::Image.new
image.set_data(pixbuf.pixels,
pixbuf.has_alpha? ? :rgba_8888 : :rgb_888,
pixbuf.width,
pixbuf.height,
pixbuf.rowstride)
content.set_content_scaling_filters(:trilinear, :linear)
content.content_gravity = :resize_aspect
content.content = image
scroll.add_child(content)
pan_action = Clutter::PanAction.new
pan_action.interpolate = true
pan_action.signal_connect("pan") do |action, actor, interpolated_p|
if interpolated_p
delta_x, delta_y = action.interpolated_delta
event_name = "INTERPOLATED"
else
delta_x, delta_y = action.get_motion_delta(0)
event = action.get_last_event(0)
event_name = event.class.name
end
puts("[#{event_name}] panning dx:#{delta_x} dy:#{delta_y}");
Clutter::Event::STOP
end
scroll.add_action(pan_action)
scroll.reactive = true
stage.add_child(scroll)
info = Clutter::Text.new(nil, "Press <space> to reset the image position.")
stage.add_child(info)
info.set_position(12, 12)
stage.signal_connect("destroy") do
Clutter.main_quit
end
stage.signal_connect("key-press-event") do |actor, event|
case event.key_symbol
when Clutter::Keys::KEY_space
scroll.save_easing_state do
scroll.easing_duration = 1000
scroll.child_transform = nil
end
end
Clutter::Event::STOP
end
stage.show
Clutter.main
|
