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# -*- indent-tabs-mode: nil -*-
class CanvasSampleFeatures < Gtk::VBox
PAD_SMALL = 4
def item_event(item, event)
if (event.event_type != Gdk::Event::BUTTON_PRESS) || (event.button != 1)
return
end
if (item.parent == @parent1)
item.reparent(@parent2)
else
item.reparent(@parent1)
end
end
def initialize
super(false, PAD_SMALL)
border_width = PAD_SMALL
show()
# Instructions
w = Gtk::Label.new("Reparent test: click on the items to switch them between parents")
pack_start(w, false, false, 0)
w.show()
# Frame and canvas
alignment = Gtk::Alignment.new(0.5, 0.5, 0.0, 0.0)
pack_start(alignment, false, false, 0)
alignment.show()
frame = Gtk::Frame.new()
frame.set_shadow_type(Gtk::SHADOW_IN);
alignment.add(frame)
frame.show()
canvas = Gnome::Canvas.new()
canvas.set_size_request(400, 200)
canvas.set_scroll_region(0, 0, 400, 200)
frame.add(canvas)
canvas.show()
# First parent and box
@parent1 = Gnome::CanvasGroup.new(canvas.root,
{:x => 0.0,
:y => 0.0})
Gnome::CanvasRect.new(@parent1,
{:x1 => 0.0,
:y1 => 0.0,
:x2 => 200.0,
:y2 => 200.0,
:fill_color => "tan"})
# Second parent and box
@parent2 = Gnome::CanvasGroup.new(canvas.root,
{:x => 200.0,
:y => 0.0})
Gnome::CanvasRect.new(@parent2,
{:x1 => 0.0,
:y1 => 0.0,
:x2 => 200.0,
:y2 => 200.0,
:fill_color => "#204060"})
# Big circle to be reparented
item = Gnome::CanvasEllipse.new(@parent1,
{:x1 => 10.0,
:y1 => 10.0,
:x2 => 190.0,
:y2 => 190.0,
:outline_color => "black",
:fill_color => "mediumseagreen",
:width_units => 3.0})
item.signal_connect("event") do |item, event|
item_event(item, event)
end
# A group to be reparented
group = Gnome::CanvasGroup.new(@parent2,
{:x => 100.0,
:y => 100.0})
Gnome::CanvasEllipse.new(group,
{:x1 => -50.0,
:y1 => -50.0,
:x2 => 50.0,
:y2 => 50.0,
:outline_color => "black",
:fill_color => "wheat",
:width_units => 3.0})
Gnome::CanvasEllipse.new(group,
{:x1 => -25.0,
:y1 => -25.0,
:x2 => 25.0,
:y2 => 25.0,
:fill_color => "steelblue"})
group.signal_connect("event") do |item, event|
item_event(item, event)
end
# Done
end
end
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