Re: [ruby-gnome2-devel-en] problems with ruby/gtk/tcp

[amerke <art...@ud...>]

sounds good, looking forward to GTK5 :-)

maybe i also get used to some unexpected(?) behaviour. consider the code:

require 'gtk3'
require 'cairo'

class ArtScrollCanvas < Gtk::Grid
   def initialize
     super

     @user_zoom= 1.0
     @darea = Gtk::DrawingArea.new

     @darea.hexpand= true
     @darea.vexpand= true

     @darea.signal_connect('configure-event') do
       print "\n darea_configure_callback"
       update_adjustments_and_paint(0.0, 0.0)
     end

     @darea.signal_connect "draw" do |_, cr|
       paint(cr)
     end

     attach(@darea, 0, 0, 1, 1)
     update_adjustments_and_paint(0.0, 0.0)
   end

   def update_adjustments_and_paint(dx= 0.0, dy= 0.0)
     @darea.queue_draw_area(0, 0, @darea.allocation.width, 
@darea.allocation.height)
   end

   def paint(cr)
     cr.set_source_rgba(1, 1, 1, 1)
     cr.paint
     #cr.save
     #cr.restore

     #cr.save
     #m= Cairo::Matrix.new(1.0, 0.0, 0.0, 1.0, 300.0, 200.0)
     m= Cairo::Matrix.new(1.0, 0.0, 0.0, 1.0, 300.0, 100.0)
     cr.set_matrix(m)
     cr.move_to(0.0, 0.0)
     cr.line_to(100.0, 0.0)
     cr.line_to(100.0, 100.0)
     cr.line_to(0.0, 100.0)
     cr.set_source_rgba(1.0, 0.0, 0.0, 1.0)
     cr.fill
     #cr.restore
   end
end

class ArtApplicationWindow < Gtk::ApplicationWindow
   def initialize(application)
     super(application)
     signal_connect('destroy') do
       #Gtk.main_quit
       application.quit
     end
     set_title 'Art'
     set_size_request(600, 400)
     @canvas = ArtScrollCanvas.new

     @b1 = Gtk::Button.new(label: "New")
     @b2 = Gtk::Button.new(label: "New")
     @b3 = Gtk::Button.new(label: "New")
     @vbox = Gtk::Box.new(:vertical, 0)

     @vbox.pack_start(@b1, :expand => false, :fill => false, :padding => 0)
     @vbox.pack_start(@b2, :expand => false, :fill => false, :padding => 0)
     @vbox.pack_start(@b3, :expand => false, :fill => false, :padding => 0)
     @vbox.pack_start(@canvas, :expand => true, :fill => true, :padding 
=> 0)
     add(@vbox)
     show_all
   end
end # ArtApplicationWindow

class ArtApp < Gtk::Application
   def initialize
     super("org.gtk.exampleapp", :handles_open)

     signal_connect('activate') do |application|
       window = ArtApplicationWindow.new(application)
       window.present
     end
   end
end

app = ArtApp.new
app.run


the matrix seems to be applied with respect to the entire window but NOT 
with respect to the DrawingArea (is much to high)

how do i use a cairo contex with matrix transformations with respect to 
the DrawingArea itself?

i also curious why the buttons keep pressed/focused (it are normal 
buttons, not togglebuttons)

cheers

artur

On 02.08.20 23:25, Sutou Kouhei wrote:
> Hi,
> 
> In <8f6...@ud...>
>    "Re: [ruby-gnome2-devel-en] problems with ruby/gtk/tcp" on Sun, 2 Aug 2020 17:57:59 +0200,
>    amerke <art...@ud...> wrote:
> 
>> thank you kou, this seems to work fine (but is not well documented :-(
> 
> I hope that this GC related work is done without user
> code. But I don't have an idea for now. :<
> (The block of ss.signal_connect("incoming") doesn't refer
> local variables like the channel automatically.)
> 
>> btw. just another question: what about the status of ruby and GTK
>> (ver. 4). is it going to be continued in the future?
> 
> Yes.
> There is an implementation for Ruby/GTK4:
> https://github.com/ruby-gnome/ruby-gnome/tree/master/gtk4
> We'll release it when GTK 4 is released.
> 
>> (the number of posts in this list is almost 0 :-)
> 
> Recently, users use GitHub issues:
> https://github.com/ruby-gnome/ruby-gnome/issues?q=is%3Aissue+is%3Aclosed
> 
>> also there are almost no ruby/GTK projects on github ...
> 
> It seems there are 20+ projects that use Ruby/GTK3:
> https://rubygems.org/gems/gtk3/reverse_dependencies
> 
>> earlier on i used qt4 but the support for qt4 was discontinued (no
>> qtbindungs for qt5) ... so i would like to know more about the future
>> of ruby/GTK. i think missing good ruby support for the two major
>> platforms (GTK/QT) is one of the reasons why ruby is staying behind
>> python, considering the number of (gui but also other) projects
>> etc. (at least outside of japan)
> 
> We'll maintain Ruby/GTK4, Ruby/GTK5 and so on because we (at
> least me) will use them. :-)
> 
> 
> Thanks,
> --
> kou
> 
> 
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