wx.lib.agw.knobctrl.BufferedWindow

A Buffered window class.

To use it, subclass it and define a Draw(dc) method that takes a dc to draw to. In that method, put the code needed to draw the picture you want. The window will automatically be double buffered, and the screen will be automatically updated when a Paint event is received.

When the drawing needs to change, you app needs to call the BufferedWindow.UpdateDrawing() method. Since the drawing is stored in a bitmap, you can also save the drawing to file by calling the SaveToFile(self, file_name, file_type) method.

Class Hierarchy

Inheritance diagram for class BufferedWindow:

Known Subclasses

wx.lib.agw.knobctrl.KnobCtrl

Known Superclasses

wx.Window

Methods Summary

__init__	Default class constructor.
Draw	This method should be overridden when sub-classed.
OnPaint	Handles the wx.EVT_PAINT event for BufferedWindow.
OnSize	Handles the wx.EVT_SIZE event for BufferedWindow.
UpdateDrawing	This would get called if the drawing needed to change, for whatever reason.

Class API

class BufferedWindow(wx.Window)

A Buffered window class.

To use it, subclass it and define a Draw(dc) method that takes a dc to draw to. In that method, put the code needed to draw the picture you want. The window will automatically be double buffered, and the screen will be automatically updated when a Paint event is received.

When the drawing needs to change, you app needs to call the BufferedWindow.UpdateDrawing() method. Since the drawing is stored in a bitmap, you can also save the drawing to file by calling the SaveToFile(self, file_name, file_type) method.

Methods

__init__(self, parent, id=wx.ID_ANY, pos=wx.DefaultPosition, size=wx.DefaultSize, style=wx.NO_FULL_REPAINT_ON_RESIZE, agwStyle=KC_BUFFERED_DC)

Default class constructor.

Parameters:

• parent – parent window. Must not be None;

• id – window identifier. A value of -1 indicates a default value;

• pos – the control position. A value of (-1, -1) indicates a default position, chosen by either the windowing system or wxPython, depending on platform;

• size – the control size. A value of (-1, -1) indicates a default size, chosen by either the windowing system or wxPython, depending on platform;

• style – the window style;

• agwStyle – if set to KC_BUFFERED_DC, double-buffering will be used.

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Draw(self, dc)

This method should be overridden when sub-classed.

Parameters:

dc – an instance of wx.DC.

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OnPaint(self, event)

Handles the wx.EVT_PAINT event for BufferedWindow.

Parameters:

event – a PaintEvent event to be processed.

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OnSize(self, event)

Handles the wx.EVT_SIZE event for BufferedWindow.

Parameters:

event – a wx.SizeEvent event to be processed.

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UpdateDrawing(self)

This would get called if the drawing needed to change, for whatever reason.

The idea here is that the drawing is based on some data generated elsewhere in the system. If that data changes, the drawing needs to be updated.