Mercurial > hg-public > lasercut-scripts / file comparison
comparison: printrun-src/printrun/gui/bufferedcanvas.py
printrun-src/printrun/gui/bufferedcanvas.py
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- 0bbb006204fc
- child 46
- cce0af6351f0
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| 1 """ | |
| 2 BufferedCanvas -- flicker-free canvas widget | |
| 3 Copyright (C) 2005, 2006 Daniel Keep, 2011 Duane Johnson | |
| 4 | |
| 5 To use this widget, just override or replace the draw method. | |
| 6 This will be called whenever the widget size changes, or when | |
| 7 the update method is explicitly called. | |
| 8 | |
| 9 Please submit any improvements/bugfixes/ideas to the following | |
| 10 url: | |
| 11 | |
| 12 http://wiki.wxpython.org/index.cgi/BufferedCanvas | |
| 13 | |
| 14 2006-04-29: Added bugfix for a crash on Mac provided by Marc Jans. | |
| 15 """ | |
| 16 | |
| 17 # Hint: try removing '.sp4msux0rz' | |
| 18 __author__ = 'Daniel Keep <daniel.keep.sp4msux0rz@gmail.com>' | |
| 19 | |
| 20 __license__ = """ | |
| 21 This file is part of the Printrun suite. | |
| 22 | |
| 23 Printrun is free software: you can redistribute it and/or modify | |
| 24 it under the terms of the GNU General Public License as published by | |
| 25 the Free Software Foundation, either version 3 of the License, or | |
| 26 (at your option) any later version. | |
| 27 | |
| 28 Printrun is distributed in the hope that it will be useful, | |
| 29 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 30 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 31 GNU General Public License for more details. | |
| 32 | |
| 33 You should have received a copy of the GNU General Public License | |
| 34 along with Printrun. If not, see <http://www.gnu.org/licenses/>. | |
| 35 """ | |
| 36 | |
| 37 __all__ = ['BufferedCanvas'] | |
| 38 | |
| 39 import wx | |
| 40 | |
| 41 class BufferedCanvas(wx.Panel): | |
| 42 """ | |
| 43 Implements a flicker-free canvas widget. | |
| 44 | |
| 45 Standard usage is to subclass this class, and override the | |
| 46 draw method. The draw method is passed a device context, which | |
| 47 should be used to do your drawing. | |
| 48 | |
| 49 If you want to force a redraw (for whatever reason), you should | |
| 50 call the update method. This is because the draw method is never | |
| 51 called as a result of an EVT_PAINT event. | |
| 52 """ | |
| 53 | |
| 54 # These are our two buffers. Just be aware that when the buffers | |
| 55 # are flipped, the REFERENCES are swapped. So I wouldn't want to | |
| 56 # try holding onto explicit references to one or the other ;) | |
| 57 buffer = None | |
| 58 backbuffer = None | |
| 59 | |
| 60 def __init__(self, | |
| 61 parent, | |
| 62 ID=-1, | |
| 63 pos = wx.DefaultPosition, | |
| 64 size = wx.DefaultSize, | |
| 65 style = wx.NO_FULL_REPAINT_ON_RESIZE | wx.WANTS_CHARS): | |
| 66 wx.Panel.__init__(self, parent, ID, pos, size, style) | |
| 67 | |
| 68 # Bind events | |
| 69 self.Bind(wx.EVT_PAINT, self.onPaint) | |
| 70 | |
| 71 # Disable background erasing (flicker-licious) | |
| 72 def disable_event(*pargs, **kwargs): | |
| 73 pass # the sauce, please | |
| 74 self.Bind(wx.EVT_ERASE_BACKGROUND, disable_event) | |
| 75 | |
| 76 # | |
| 77 # General methods | |
| 78 # | |
| 79 | |
| 80 def draw(self, dc, w, h): | |
| 81 """ | |
| 82 Stub: called when the canvas needs to be re-drawn. | |
| 83 """ | |
| 84 pass | |
| 85 | |
| 86 def update(self): | |
| 87 """ | |
| 88 Causes the canvas to be updated. | |
| 89 """ | |
| 90 self.Refresh() | |
| 91 | |
| 92 def getWidthHeight(self): | |
| 93 width, height = self.GetClientSizeTuple() | |
| 94 if width == 0: | |
| 95 width = 1 | |
| 96 if height == 0: | |
| 97 height = 1 | |
| 98 return (width, height) | |
| 99 | |
| 100 # | |
| 101 # Event handlers | |
| 102 # | |
| 103 | |
| 104 def onPaint(self, event): | |
| 105 # Blit the front buffer to the screen | |
| 106 w, h = self.GetClientSizeTuple() | |
| 107 if not w or not h: | |
| 108 return | |
| 109 else: | |
| 110 dc = wx.BufferedPaintDC(self) | |
| 111 self.draw(dc, w, h) |
