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|
=begin
drag-move.rb - Move widget by drag sample script.
Copyright (C) 2011-2014 Ruby-GNOME2 Project Team
Copyright (C) 2006 Kouhei Sutou
This program is licenced under the same licence as Ruby-GNOME2.
$Date: 2006/06/17 13:18:12 $
$Id: drag-move.rb,v 1.2 2006/06/17 13:18:12 mutoh Exp $
=end
require "gtk3"
class DraggableWidget < Gtk::EventBox
def initialize
super
set_visible_window(false)
@dragging = false
@drag_button = 1
set_button_press_event
set_button_release_event
set_motion_notify_event
end
def layout
parent
end
def move(x, y)
if layout
layout.move(self, x, y)
true
else
false
end
end
def dragging?
@dragging
end
private
def set_button_press_event
signal_connect("button-press-event") do |widget, event|
if event.button == @drag_button
Gtk.grab_add(widget)
x, y, w, h = widget.allocation.to_a
drag_start(x, y, event.x_root, event.y_root)
else
false
end
end
end
def set_motion_notify_event
signal_connect("motion-notify-event") do |widget, event|
if dragging?
drag_motion(event.x_root, event.y_root)
else
false
end
end
end
def set_button_release_event
signal_connect("button-release-event") do |widget, event|
if event.button == @drag_button
Gtk.grab_remove(widget)
drag_end
else
false
end
end
end
def set_drag_move_position_event
signal_connect("drag-move-position") do |widget, x, y|
if layout
layout.move(widget, x, y)
true
else
false
end
end
end
def drag_start(x, y, base_x, base_y)
@dragging = true
@drag_x = x
@drag_y = y
@drag_base_x = base_x
@drag_base_y = base_y
true
end
def drag_motion(base_x, base_y)
delta_x = base_x - @drag_base_x
delta_y = base_y - @drag_base_y
if delta_x != 0 and delta_y != 0
move(@drag_x + delta_x, @drag_y + delta_y)
else
false
end
end
def drag_end
@dragging = false
true
end
end
window = Gtk::Window.new("Draggable Widget sample")
window.signal_connect("destroy") {Gtk.main_quit}
layout = Gtk::Layout.new
draggable_widget = DraggableWidget.new
draggable_widget.set_size_request(50, 50)
layout.put(draggable_widget, 75, 75)
draggable_widget.signal_connect("draw") do |widget, context|
width = widget.width_request
height = widget.height_request
context.fill do
center_x = width / 2
center_y = height / 2
radius = width / 2
start_angle = 0 * Math::PI
stop_angle = 2 * Math::PI
context.arc(center_x, center_y, radius, start_angle, stop_angle)
end
false
end
window.add(layout)
window.show_all
Gtk.main
|
