[kupfer] quickview: Add very simple image viewer plugin

[Ulrik Sverdrup <usverdrup src gnome org>]

commit 6fe3b24821bae0c44d39e3e77c16dcd4a832f2fc
Author: Ulrik Sverdrup <ulrik sverdrup gmail com>
Date:   Sun Mar 20 20:15:20 2011 +0100

    quickview: Add very simple image viewer plugin

 kupfer/plugin/quickview.py |   84 ++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 84 insertions(+), 0 deletions(-)
---
diff --git a/kupfer/plugin/quickview.py b/kupfer/plugin/quickview.py
new file mode 100644
index 0000000..314d52b
--- /dev/null
+++ b/kupfer/plugin/quickview.py
@@ -0,0 +1,84 @@
+__kupfer_name__ = _("Quick Image Viewer")
+__kupfer_actions__ = ("View", )
+__description__ = ""
+__version__ = ""
+__author__ = ""
+
+import shutil
+
+import gio
+import glib
+import gtk
+
+from kupfer.objects import Action, FileLeaf
+from kupfer.objects import OperationError
+from kupfer import utils
+
+def is_content_type(fileleaf, ctype):
+	predicate = gio.content_type_is_a
+	ctype_guess, uncertain = gio.content_type_guess(fileleaf.object, None, True)
+	ret = predicate(ctype_guess, ctype)
+	if ret or not uncertain:
+		return ret
+	content_attr = gio.FILE_ATTRIBUTE_STANDARD_CONTENT_TYPE
+	gfile = gio.File(fileleaf.object)
+	if not gfile.query_exists(None):
+		return
+	info = gfile.query_info(content_attr)
+	content_type = info.get_attribute_string(content_attr)
+	return predicate(content_type, ctype)
+
+def _set_size(loader, width, height, max_w, max_h):
+	if width <= max_w and height <= max_h:
+		return
+	w_scale = max_w*1.0/width
+	h_scale = max_h*1.0/height
+	scale = min(w_scale, h_scale)
+	loader.set_size(int(width*scale), int(height*scale))
+
+def load_image_max_size(filename, w, h):
+	pl = gtk.gdk.PixbufLoader()
+	pl.connect("size-prepared", _set_size, w, h)
+	try:
+		with open(filename, "r") as f:
+			shutil.copyfileobj(f, pl)
+		pl.close()
+	except (glib.GError, EnvironmentError) as exc:
+		raise OperationError(exc)
+	return pl.get_pixbuf()
+
+def window_key_press(window, event, filepath):
+	if gtk.gdk.keyval_name(event.keyval) == "Escape":
+		window.destroy()
+		return True
+	if gtk.gdk.keyval_name(event.keyval) == "Return":
+		utils.show_path(filepath)
+		window.destroy()
+		return True
+
+class View (Action):
+	def __init__(self):
+		Action.__init__(self, _("View Image"))
+
+	def item_types(self):
+		yield FileLeaf
+
+	def valid_for_item(self, obj):
+		return is_content_type(obj, "image/*")
+
+	def activate(self, obj):
+		image_widget = gtk.Image()
+		h = gtk.gdk.screen_height()
+		w = gtk.gdk.screen_width()
+		image_widget.set_from_pixbuf(load_image_max_size(obj.object, w, h))
+		image_widget.show()
+		window = gtk.Window() 
+		window.set_title(utils.get_display_path_for_bytestring(obj.object))
+		window.set_position(gtk.WIN_POS_CENTER)
+		window.add(image_widget)
+		window.present()
+		window.connect("key-press-event", window_key_press, obj.object)
+
+	def get_description(self):
+		return None
+