Hi,
I have been unable to get drag and drop validation working in pygtk. I
am out of ideas and would like a second opinion.
My goal is to only allow files which contain .jpg to be dropped.
Specifically, whenever I call widget.drag_get_data within the
drag-motion callback The X11 cursor locks up. Making debugging tedious
and aggravating since I have to kill X11 and re launch everything.
Here is my source code, I think the issue lies specifically in the
drag_motion_cb and drag_data_received_cb methods. I have left the
commented out sections I have tried before.
Using Google code search searching for drag_get_data doesn't show
anyone else doing advanced validation. So I'm guessing others failed
as well.
I am out of ideas and will end up just using simple DnD in my linux
port (without proper validation) if I cannot figure this out.
Thanks in advance.
=============
import pygtk
pygtk.require('2.0')
import gobject
import gtk
TARGET_TEXT_URI_LIST = 0
drop_targets = [
("text/uri-list", 0, TARGET_TEXT_URI_LIST)
]
class TestApp(gobject.GObject):
builder = gtk.Builder()
window = None
button = None
def __init__(self):
gobject.GObject.__init__(self)
assert self.builder != None
self.builder.add_from_file("MainWindow.glade");
self.window = self.builder.get_object("window1")
self.button = self.builder.get_object("button1")
self.window.connect("destroy", gtk.main_quit)
self.button.drag_dest_set(gtk.DEST_DEFAULT_ALL, drop_targets,
gtk.gdk.ACTION_COPY|gtk.gdk.ACTION_LINK|gtk.gdk.ACTION_MOVE)
self.button.connect("drag-data-received", self.drag_data_received_cb)
self.button.connect("drag-drop", self.drag_drop_cb)
self.button.connect("drag-motion", self.drag_motion_cb)
self.button.connect("drag-leave", self.drag_leave_cb)
self.window.show_all()
drop_data_ready = False
drop_occurred = False
drop_highlight = False
drop_data = None
def drag_data_received_cb(self,widget,context,x,y,data,info,timestamp):
print "drag_data_received_cb"
# Check to see if we have the drop data yet.
if False == self.drop_data_ready:
# If this is data we expected or can handle, then process it.
if TARGET_TEXT_URI_LIST == info and data.get_format() == 8 and
data.get_length() > 0:
self.drop_data = data.get_uris()
self.drop_data_ready = True
context.drag_status(gtk.gdk.ACTION_COPY, timestamp)
# Actual drop handling code.
if True == self.drop_occurred:
# Reset state.
self.drop_occurred = False
print "RECEIVED DROP",self.drop_data
# Notify whether we handled the drop or not.
context.finish(True,False,timestamp)
# Clean up.
self.drag_leave_cb(widget, context, timestamp)
return True
def drag_drop_cb(self,widget,context,x,y,timestamp):
target = widget.drag_dest_find_target(context,
widget.drag_dest_get_target_list())
# Is it something we can handle?
if target == gtk.gdk.atom_intern("text/uri-list", False):
# Tell data recieved handler (do_drag_data_received) we can
actually handle the drop.
self.drop_occurred = True
widget.drag_get_data(context,target,timestamp)
# We can handle this data type.
return True
else:
# We cannot handle the drop.
return False
pass
def drag_motion_cb(self,widget,context,x,y,timestamp):
if not self.drop_data_ready:
widget.drag_get_data(context,
gtk.gdk.atom_intern("text/uri-list",False), timestamp)
return False
"""
target = widget.drag_dest_find_target(context,
widget.drag_dest_get_target_list())
if target == gtk.gdk.atom_intern("text/uri-list", False):
if True == self.drop_data_ready:
pass
else:
#widget.drag_get_data(context, target, timestamp)
pass
"""
context.drag_status(gtk.gdk.ACTION_COPY, timestamp)
"""
if target == gtk.gdk.atom_intern("text/uri-list", False):
if True == self.drop_data_ready:
if repr(drop_data).find(".jpg") != -1:
# Tell Gdk we can handle this.
context.drag_status(gtk.gdk.ACTION_COPY, timestamp)
# Draw drop highlight (but only once).
if False == self.drop_highlight:
widget.drag_highlight()
self.drop_highlight = True
# Return here, don't fall through.
return True
else:
# Request drag data from the source.
widget.drag_get_data(context, target, timestamp)
# Fall-through to not allowing.
"""
# not something we can handle
#context.drag_status(0, timestamp) # Don't allow drop.
return True
pass
def drag_leave_cb(self,widget,context,timestamp):
# Cleanup drag data.
if True == self.drop_data_ready:
self.drop_data = None
self.drop_data_ready = False
# Un-draw the highlight.
if True == self.drop_highlight:
widget.drag_unhighlight()
self.drop_highlight = False
pass
gobject.type_register(TestApp)
def main():
car = TestApp()
gtk.main()
if __name__ == '__main__':
main()
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