Source code for camelot.view.action_steps.update_progress

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#  This file is part of the Camelot Library.
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from camelot.admin.action import ActionStep
from camelot.core.exception import CancelRequest

class UpdateProgress( ActionStep ):
    """
Inform the user about the progress the application is making
while executing an action.  This ActionStep is not blocking.  So it can
be used inside transactions and will result in a minimum of delay when
yielded.  Each time an object is yielded, the progress dialog will be
updated.

.. image:: /_static/controls/progress_dialog.png

:param value: the current step
:param maximum: the maximum number of steps that will be executed. set it
    to 0 to display a busy indicator instead of a progres bar
:param text: the text to be displayed inside the progres bar
:param detail: the text to be displayed below the progres bar, this text is
    appended to the text already there
:param clear_details: clear the details text already there before putting 
    the new detail text.
"""
    blocking = False
    
    def __init__( self,
                  value=0, 
                  maximum=0, 
                  text=None, 
                  detail=None, 
                  clear_details=False ):
        super(UpdateProgress, self).__init__()
        self._value = value
        self._maximum = maximum
        self._text = text
        self._detail = detail
        self._clear_details = clear_details
        
    def __unicode__( self ):
        return u'Update Progress {0._value:03d}/{0._maximum:03d} {0._text}'.format( self )
    
    def gui_run( self, gui_context ):
        """This method will update the progress dialog, if such dialog exists
        within the GuiContext
        
        :param gui_context: a :class:`camelot.admin.action.GuiContext` instance
        """
        progress_dialog = gui_context.progress_dialog
        if progress_dialog:
            if progress_dialog.wasCanceled():
                progress_dialog.reset()
                raise CancelRequest()
            progress_dialog.setMaximum( self._maximum )
            progress_dialog.setValue( self._value )
            if self._text != None:
                progress_dialog.setLabelText( unicode(self._text) )