widget

Utilities Progress Bar Operations that take more than a split second indicate their progress with a progress bar and in the title bar of the widget’s window. There are three mechanisms for implementing this. Context handlers The recommended and the simplest approach is to wrap the code into context handler progressBar . If the operation consists of a known number of steps that take similar time, the context handler can be used as follows: with self.progressBar(n_steps) as progress: for k in range(n_steps): self.do_some_processing() progress.advance() In general, the argument of self

Orange的扩展插件Widgets开发（七） －Library of Common GUI Controls gui is a library of functions which allow constructing a control (like check box, line edit or a combo), inserting it into the parent’s layout, setting tooltips, callbacks and so forth, establishing synchronization with a Python object’s attribute (including saving and retrieving when the widgets is closed and reopened) ... in a single call. Almost all functions need three arguments: the widget into which the control is inserted, the master widget with one whose attributes the control’s value is synchronized, the name of that attribute (

Orange的扩展插件Widgets开发（六） －OWWidget The OWWidget is the main component for implementing a widget in the Orange Canvas workflow. It both defines the widget input/output capabilities and implements it’s functionality within the canvas. Widget Meta Description Every widget in the canvas framework needs to define it’s meta definition. This includes the widget’s name and text descriptions but more importantly also its input/output specification. This is done by defining constants in the widget’s class namespace: class IntConstant(OWWidget): name = "Integer Constant" description "A simple integer