Inheritance diagram of TaurusBaseWidget
class TaurusBaseWidget(name='', parent=None, designMode=False, **kwargs)[source]

Bases: taurus.qt.qtgui.base.taurusbase.TaurusBaseComponent

The base class for all Qt Taurus widgets.


Any class which inherits from TaurusBaseWidget is expected to also inherit from QWidget (or from a QWidget derived class)


overwrites QWidget.changeEvent(self, evt) to handle the ParentChangeEvent in case this widget is using the parent model. Always calls the QWidget.changeEvent in order not to lose events


Override of the QWidget.closeEvent()


reimplemented to support drag&drop of models. See QWidget


reimplemented to support drag&drop of models. See QWidget


Connect the specific XXXXChanged signals from derived classes to this method in order to have a unified signal which can be used by Taurus Widgets


Returns if the widget is automatically generating a tooltip based on the current widget model.

Return type:bool
Returns:True if automatically generating tooltip or False otherwise

returns the method to be called when a dropping event occurs. The default implementation returns self.setModel. Reimplement it subclasses to call different methods.

Return type:callable

Returns a MimeData object containing the model data. The default implementation fills the TAURUS_MODEL_MIME_TYPE. If the widget’s Model class is Attribute or Device, it also fills TAURUS_ATTR_MIME_TYPE or TAURUS_DEV_MIME_TYPE, respectively

Return type:QMimeData

Returns the first taurus component in the widget hierarchy or None if no taurus component is found

Return type:TaurusBaseComponent or None
Returns:the parent taurus base component

Returns the parent Qt class for this widget

Parameters:bases (sequence <class> or None) – the list of class objects. If None is given (default) it uses the object base classes from __bases__
Return type:QWidget class
Returns:the QWidget class object
classmethod getQtDesignerPluginInfo()[source]

Returns pertinent information in order to be able to build a valid QtDesigner widget plugin.

The dictionary returned by this method should contain at least the following keys and values: - ‘module’ : a string representing the full python module name (ex.: ‘taurus.qt.qtgui.base’) - ‘icon’ : a string representing valid resource icon (ex.: ‘designer:combobox.png’) - ‘container’ : a bool telling if this widget is a container widget or not.

This default implementation returns the following dictionary:

{ 'group'     : 'Taurus [Unclassified]',
  'icon'      : 'logos:taurus.png',
  'container' : False }
Return type:dict
Returns:a map with pertinent designer information

returns a list of supported mimeTypes that this widget support (ordered by priority). If none is set explicitely via setSupportedMimeTypes(), a best effort will be tried based on the model class

..seealso: setSupportedMimeTypes()

This provides only a very basic implementation. Reimplement in derived classes if needed

Return type:list <str>
Returns:list of MIME type names
handleEvent(evt_src, evt_type, evt_value)[source]

very basic and generalistic handling of events.

Override when necessary.

  • evt_src (object or None) – object that triggered the event
  • evt_type (TaurusEventType or None) – type of event
  • evt_value (object or None) – event value
handleMimeData(mimeData, method)[source]

Selects the most appropriate data from the given mimeData object (in the order returned by getSupportedMimeTypes()) and passes it to the given method.

  • mimeData (QMimeData) – the MIME data object from which the model is to be extracted
  • method (callable <str>) – a method that accepts a string as argument. This method will be called with the data from the mimeData object
Return type:

str or None


returns the MimeType used if the model was successfully set, or None if the model could not be set


Override of the QWidget.hideEvent()


whether the user can drag data from this widget

Return type:bool
Returns:True if the user can drag data

Base signal modelChanged


reimplemented to provide drag events. See QWidget


reimplemented to record the start position for drag events. See QWidget


Slot to allow interactive setting of the Formatter.

See also

TaurusBaseWidget.showFormatterDlg(), TaurusBaseComponent.displayValue(), tauruscustomsettings.DEFAULT_FORMATTER


Invoked when the Taurus parent model changes

Parameters:parentmodel_name (str) – the new name of the parent model

Forces the widget to recheck its Taurus parent. Taurus Widgets will in most situations keep track of changes in their taurus parenting, but in some special cases (which unfortunately tend to occur when using Qt Designer) they may not update it correctly.

If this happens, you can manually call this method.

For more information, check the issue demo example


Equivalent to setDragEnabled(self.__class__._dragEnabled)


Applies the given operations (or the pending operations if None passed)

Parameters:ops (sequence <TaurusOperation> or None) – list of operations to apply. If None is given (default) the component fetches the pending operations
Return type:bool
Returns:False if the apply was aborted by the user or if the widget is in design mode. True otherwise.

Determines if the widget should automatically generate a tooltip based on the current widget model.

Parameters:yesno (bool) – True to automatically generate tooltip or False otherwise

Sets/unsets disconnection on hide event

Parameters:disconnect (bool) – whether or not to disconnect on hide event

sets whether the user is allowed to drag data from this widget

Parameters:modifiable (bool) –
setModelCheck(model, check=True)[source]

Sets the component taurus model. Setting the check argument to True (default) will check if the current model is equal to the given argument. If so then nothing is done. This should be the standard way to call this method since it will avoid recursion.

  • model (str) – the new model name
  • check (bool) – whether or not to check against the actual model name

extends TaurusBaseComponent.setModelInConfig() to include also the “useParentModel” property


Reimplemented to acept/reject drops based on whether the widget is modifiable by the user. See TaurusBaseComponent.setModifiableByUser()


sets the mimeTypes that this widget support

Parameters:mimetypes (list <str>) – list (ordered by priority) of MIME type names

Sets/unsets using the parent model.


in some cases you may need to call recheckTaurusParent() after reparenting of some of this widget’s ancestors

Parameters:yesno (bool) – whether or not to use parent model

Override of the QWidget.showEvent()


showFormatterDlg show a dialog to get the formatter from the user. :return: formatter: python fromat string or formatter callable (in string version) or None


This method should be reimplemented by derived classes that want to change their appearance depending whether there are pending operations or not


Updates the widget style. Default implementation just calls QWidget.update()

Override when necessary.


Base signal valueChanged