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Re: [ruby-gnome2-devel-en] Displaying web images
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From: Detlef R. <det...@gm...> - 2014-08-18 16:39:08
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Hi,
I think, that it is a bug in current (ruby) gtk. Not even the example in
the ruby-gnome source in
ruby-gnome2/gtk3/sample/misc/hreads.rb
runs as expected.
Cheers, detlef
Am 17.08.2014 21:56, schrieb Michael Below:
>
> Hi,
>
> I would like to download a series of images, and then the next one, not
> individual images. That way I get a broader selection of images
> (including older ones with the first download, newer ones later).
>
> I am including my current code below. I tried loading a second set of
> images after starting the auto_show, but the whole download is done
> before the first image is shown.
>
> Best
> Michael
>
>
> -snip-
>
> require 'gtk3'
> require 'open-uri'
> require 'tempfile'
> require 'flickraw'
>
> class RubyApp < Gtk::Window
>
> def initialize
> super
>
> signal_connect "destroy" do
> Gtk.main_quit end
>
> set_default_size 300, 200
> maximize
> set_window_position Gtk::Window::Position::CENTER
>
> @pixbufs = []
> @flickpixbufs = []
> iswindow = true
>
>
> FlickRaw.api_key=
> FlickRaw.shared_secret=
>
> flickthread = Thread.new {
> flickresults = flickr.photos.search(:tags => "Tag", :per_page =>
> 50)
>
> getimages(flickresults,"FlickRaw.url_b(currentresult)",@flickpixbufs)
> }
>
> # event handler
> signal_connect("key-press-event") do |_widget, event|
> case event.keyval
> when Gdk::Keyval::GDK_KEY_Right
> @pixbufs.push(@pixbufs.shift)
> update_image(@pixbufs.first)
> when Gdk::Keyval::GDK_KEY_Left
> @pixbufs.unshift(@pixbufs.pop)
> update_image(@pixbufs.first)
> when Gdk::Keyval::GDK_KEY_F11
> if iswindow
> fullscreen
> iswindow = false
> else
> unfullscreen
> iswindow = true
> end
> end
> end
>
> flickthread.join
> @pixbufs = @flickpixbufs
> update_image(@pixbufs.first)
>
> auto_show(@pixbufs)
>
> end
>
> def getimages(resultarray, method, pixbufsarray)
> resultarray.each{|currentresult|
> image_path = Tempfile.open("display-web-image-in-gtk") do |
> tempfile|
> begin
> urlimage = open(eval(method))
> rescue OpenURI::HTTPError => e
> puts e
> puts "cannot load image"
> break
> end
> tempfile.write(urlimage.read)
> tempfile.path
> end
> unless image_path.nil?
> fillpixbufs(image_path,pixbufsarray)
> end
> }
> end
>
> def fillpixbufs(image,dlpixbufs)
> begin
> currentpixbuf = Gdk::Pixbuf.new(image)
> rescue IOError => e
> puts e
> puts "cannot load images"
> exit
> end
> maxheight = 700
> myheight = currentpixbuf.height
> if myheight > maxheight
> mywidth = currentpixbuf.width
> newwidth=(mywidth*(maxheight.to_f/myheight)).round
>
> currentpixbuf=currentpixbuf.scale(newwidth,maxheight,Gdk::Pixbuf::INTERP_BILINEAR)
> end
> puts image
> dlpixbufs << currentpixbuf
> end
>
> def auto_show(pixbufs) # auto mode
> GLib::Timeout.add(600) do
> @pixbufs.push(pixbufs.shift)
> update_image(pixbufs.first)
> true # continue
> end
> end
>
> def update_image(currentpixbuf)
> if (defined?(@gtkimage)).nil?
> @gtkimage = Gtk::Image.new :pixbuf => currentpixbuf
> add @gtkimage
> else
> @gtkimage.set_pixbuf(currentpixbuf)
> end
> show_all
> end
> end
>
>
> Gtk.init
> window = RubyApp.new
> Gtk.main
>
> -snip-
>
>
> Am Sonntag, den 17.08.2014, 14:21 +0200 schrieb Detlef Reichl:
>> Hi,
>>
>> I don't know, whats your code look like, but I would do it in this way:
>>
>>
>> Create a thread, that loads down the images. Every time, an image is
>> completely loaded a flag is set by the loader. Then it waits, that the
>> flag is unset.
>>
>> The display system has a Fifo, where it cycles over with a timeout. In
>> this timeout the loader flag is tested. If it is set, the image is
>> pushed into the Fifo and the flag is unset after this.
>>
>> Cheers, detlef
>>
>>
>>
>> Am 17.08.2014 00:13, schrieb Michael Below:
>>> Hi,
>>>
>>> I am working on the web display issue again.
>>> Now I would like to refresh the images. I.e.:
>>>
>>> - get a set of 50 images
>>> - display the first set, meanwhile get another set of 50 images
>>> - as soon as the second set is downloaded, and the first set has been
>>> shown at least once, switch from displaying first set to displaying
>>> second set
>>> - repeat infinitely
>>>
>>> Thanks to your help, I have got the code to display the first set of
>>> pictures in a loop like this:
>>>
>>> def auto_show(pixbufs) # auto mode
>>> GLib::Timeout.add(600) do
>>> @pixbufs.push(pixbufs.shift)
>>> update_image(pixbufs.first)
>>> true # continue
>>> end
>>> end
>>>
>>> I guess I could add a second Timeout that switches the picture sets
>>> every 5 minutes or so. But is there a way to change the picture sets
>>> after successfully loading the next one?
>>>
>>> I successfully moved the download process into a separate thread, but I
>>> can't get the download to run again and again while displaying images
>>> and updating the buffer.
>>>
>>> Cheers
>>> Michael
>>>
>>>
>>> Am Montag, den 26.05.2014, 08:46 +0200 schrieb Michael Below:
>>>> Hi,
>>>>
>>>> Am Montag, den 26.05.2014, 12:30 +0900 schrieb Masafumi Yokoyama:
>>>>
>>>>> A GTK window is just shown when `Gtk.main` is called.
>>>>> `show_all` sets flag to be displayed to all widgets, but doesn't
>>>>> actually display until `Gtk.main` is called.
>>>>
>>>> Ah, I understand... I even tried to move Gtk.main into my #each loop,
>>>> but this way it makes sense.
>>>>
>>>>> It seems that need to design such as the following:
>>>>
>>>> Thanks, works fine.
>>>>
>>>> Cheers
>>>>
>>>> Michael
>>>
>>>
>>>
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>>> rub...@li...
>>> https://lists.sourceforge.net/lists/listinfo/ruby-gnome2-devel-en
>>>
>>
>>
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>
>
>
>
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