== Manipulando imagens em pyGTK ==

Exemplo bem simples de como substituir uma imagem em uma área de desenho.

'''Importante: Substituir os elementos de ''self.images'' em ''teste.py'' por imagens do filesystem local.'''


Arquivo teste.glade

{{{
<?xml version="1.0" standalone="no"?> <!--*- mode: xml -*-->
<!DOCTYPE glade-interface SYSTEM "http://glade.gnome.org/glade-2.0.dtd">

<glade-interface>

<widget class="GtkWindow" id="mainwindow">
  <property name="visible">True</property>
  <property name="events">GDK_KEY_PRESS_MASK</property>
  <property name="title" translatable="yes">window1</property>
  <property name="type">GTK_WINDOW_TOPLEVEL</property>
  <property name="window_position">GTK_WIN_POS_NONE</property>
  <property name="modal">False</property>
  <property name="resizable">True</property>
  <property name="destroy_with_parent">False</property>
  <property name="decorated">True</property>
  <property name="skip_taskbar_hint">False</property>
  <property name="skip_pager_hint">False</property>
  <property name="type_hint">GDK_WINDOW_TYPE_HINT_NORMAL</property>
  <property name="gravity">GDK_GRAVITY_NORTH_WEST</property>
  <property name="focus_on_map">True</property>
  <signal name="delete_event" handler="on_mainwindow_delete_event" last_modification_time="Fri, 11 Nov 2005 10:42:50 GMT"/>

  <child>
    <widget class="GtkDrawingArea" id="drawingarea">
      <property name="visible">True</property>
    </widget>
  </child>
</widget>

</glade-interface>
}}}

Arquivo teste.py

{{{
#!python
import gtk, gtk.glade, random

class MainWindow(object):
    
    def __init__(self,gladefile):

        # The main window widget tree
        self.wTree = gtk.glade.XML(gladefile, "mainwindow")

        # The main window
        self.mainwindow = self.wTree.get_widget("mainwindow")

        # The Drawing Area Widget
        self.draw = self.wTree.get_widget("drawingarea")

        self.images = ['img1.jpg','img2.jpg','img3.jpg','img4.jpg','img5.jpg']

        # Signal and Event handlers
        self.signals_and_events()
        

    def signals_and_events(self):
        HANDLERS_AND_METHODS = {
            "on_mainwindow_delete_event": self.destroy,
            }

        # Event handling
        self.mainwindow.connect("key_press_event",self.paint)
        self.draw.connect("expose_event",self.paint)

        # Signal handling
        self.wTree.signal_autoconnect(HANDLERS_AND_METHODS)


    def paint(self,widget,event):
        areaw, areah = self.draw.window.get_size()

        style = self.draw.get_style()
        gc = style.fg_gc[gtk.STATE_NORMAL]

        # Get the image
        img = self.images[int(random.random() * 10) % len(self.images)]
        currpix = gtk.gdk.pixbuf_new_from_file(img)

        # Get the image buffer dimensions
        pw = currpix.get_width()
        ph = currpix.get_height()

        # Resize the drawing area
        self.draw.window.resize(pw,ph)

        # Scroll the window, if necessary
        self.draw.set_size_request(pw,ph)

        # Draw the pixbuf into the drawing area
        self.draw.window.draw_pixbuf(gc, currpix, 0, 0, 0, 0, pw,ph)


    def destroy(self, widget, event=None):
        gtk.main_quit()


if __name__ == "__main__":
    app = MainWindow("teste.glade")
    gtk.main()
}}}