added multi gtk draw area example

src/Python/Scripts/GTK/multiple-draw-areas/app.py

@@ -0,0 +1,106 @@
+#!/usr/bin/python3
+
+
+
+from setproctitle import setproctitle
+import gi, os, faulthandler, signal, inspect, gi, cairo
+
+gi.require_version('Gtk', '3.0')
+
+from gi.repository import Gtk as gtk
+from gi.repository import Gdk as gdk
+from gi.repository import GdkPixbuf as gbuf
+
+
+class SupportMixin:
+    def setFile(self):
+        dialog = gtk.FileChooserDialog(title="Please choose a file", action=gtk.FileChooserAction.OPEN)
+        dialog.add_buttons(gtk.STOCK_CANCEL, gtk.ResponseType.CANCEL, gtk.STOCK_OPEN, gtk.ResponseType.OK)
+
+        response = dialog.run()
+        if response == gtk.ResponseType.OK:
+            self.file = dialog.get_filename()
+            self.setupSurfaceData(self.file)
+        elif response == gtk.ResponseType.CANCEL:
+            pass
+
+        dialog.destroy()
+
+    def setupSurfaceData(self, file):
+        pb = gbuf.Pixbuf.new_from_file(file)
+        if pb:
+            self.surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, pb.get_width(), pb.get_height())
+            context      = cairo.Context(self.surface)
+
+            gdk.cairo_set_source_pixbuf(cr=context, pixbuf=pb, pixbuf_x=0, pixbuf_y=0)
+            context.paint()
+
+            self.drawArea.set_size_request(width=pb.get_width(), height=pb.get_height())
+            self.drawArea.queue_draw()
+
+
+class Main_Draw_Area(SupportMixin):
+    def __init__(self, _builder):
+        self.surface  = None
+        self.file     = None
+        self.drawArea = _builder.get_object("drawArea1")
+
+    def setMainFile(self, widget):
+        self.setFile()
+
+    def onDraw1(self, area, context):
+        if self.surface is not None:
+            context.set_source_surface(self.surface, 0.0, 0.0)
+            context.paint()
+
+        return False
+
+
+class File_Select_Draw_Area(SupportMixin):
+    def __init__(self, _builder):
+        self.surface  = None
+        self.file     = None
+        self.drawArea = _builder.get_object("drawArea2")
+
+    def setPopupFile(self, widget):
+        self.setFile()
+
+    def onDraw2(self, area, context):
+        if self.surface is not None:
+            context.set_source_surface(self.surface, 0.0, 0.0)
+            context.paint()
+        return False
+
+
+class Window():
+    def __init__(self):
+        setproctitle('double_draw_areas')
+        SCRIPT_PTH   = os.path.dirname(os.path.realpath(__file__)) + "/"
+        GLADE_FILE   = "main.glade"
+        self.builder = gtk.Builder()
+
+        self.builder.add_from_file(SCRIPT_PTH + GLADE_FILE)
+        handlers = {}
+        classes  = [self, Main_Draw_Area(self.builder), File_Select_Draw_Area(self.builder)]
+        for c in classes:
+            methods = None
+            try:
+                methods = inspect.getmembers(c, predicate=inspect.ismethod)
+                handlers.update(methods)
+            except Exception as e:
+                pass
+
+        self.builder.connect_signals(handlers)
+        self.fileSelectionPopup = self.builder.get_object("fileSelectionPopup")
+        window = self.builder.get_object("main_window")
+        window.connect("delete_event", gtk.main_quit)
+        window.show()
+
+    def openFileSelectionPopup(self, widget):
+        self.fileSelectionPopup.popup()
+
+
+if __name__ == '__main__':
+    faulthandler.enable()  # For better debug info
+    window = Window()
+    gtk.main()