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1 | ||
2 | from wxPython.wx import * | |
3 | ||
4 | import thread | |
5 | import time | |
6 | from whrandom import random | |
7 | ||
8 | #---------------------------------------------------------------------- | |
9 | ||
10 | wxEVT_UPDATE_BARGRAPH = wxNewEventType() | |
11 | ||
12 | def EVT_UPDATE_BARGRAPH(win, func): | |
13 | win.Connect(-1, -1, wxEVT_UPDATE_BARGRAPH, func) | |
14 | ||
15 | ||
16 | class UpdateBarEvent(wxPyEvent): | |
17 | def __init__(self, barNum, value): | |
18 | wxPyEvent.__init__(self) | |
19 | self.SetEventType(wxEVT_UPDATE_BARGRAPH) | |
20 | self.barNum = barNum | |
21 | self.value = value | |
22 | ||
23 | ||
24 | #---------------------------------------------------------------------- | |
25 | ||
26 | class CalcBarThread: | |
27 | def __init__(self, win, barNum, val): | |
28 | self.win = win | |
29 | self.barNum = barNum | |
30 | self.val = val | |
31 | ||
32 | def Start(self): | |
33 | self.keepGoing = self.running = True | |
34 | thread.start_new_thread(self.Run, ()) | |
35 | ||
36 | def Stop(self): | |
37 | self.keepGoing = False | |
38 | ||
39 | def IsRunning(self): | |
40 | return self.running | |
41 | ||
42 | def Run(self): | |
43 | while self.keepGoing: | |
44 | evt = UpdateBarEvent(self.barNum, int(self.val)) | |
45 | wxPostEvent(self.win, evt) | |
46 | #del evt | |
47 | ||
48 | sleeptime = (random() * 2) + 0.5 | |
49 | time.sleep(sleeptime/4) | |
50 | ||
51 | sleeptime = sleeptime * 5 | |
52 | if int(random() * 2): | |
53 | self.val = self.val + sleeptime | |
54 | else: | |
55 | self.val = self.val - sleeptime | |
56 | ||
57 | if self.val < 0: self.val = 0 | |
58 | if self.val > 300: self.val = 300 | |
59 | ||
60 | self.running = False | |
61 | ||
62 | #---------------------------------------------------------------------- | |
63 | ||
64 | ||
65 | class GraphWindow(wxWindow): | |
66 | def __init__(self, parent, labels): | |
67 | wxWindow.__init__(self, parent, -1) | |
68 | ||
69 | self.values = [] | |
70 | for label in labels: | |
71 | self.values.append((label, 0)) | |
72 | ||
73 | font = wxFont(12, wxSWISS, wxNORMAL, wxBOLD) | |
74 | self.SetFont(font) | |
75 | ||
76 | self.colors = [ wxRED, wxGREEN, wxBLUE, wxCYAN, | |
77 | "Yellow", "Navy" ] | |
78 | ||
79 | EVT_ERASE_BACKGROUND(self, self.OnEraseBackground) | |
80 | EVT_PAINT(self, self.OnPaint) | |
81 | ||
82 | ||
83 | def SetValue(self, index, value): | |
84 | assert index < len(self.values) | |
85 | cur = self.values[index] | |
86 | self.values[index:index+1] = [(cur[0], value)] | |
87 | ||
88 | ||
89 | def SetFont(self, font): | |
90 | wxWindow.SetFont(self, font) | |
91 | wmax = hmax = 0 | |
92 | for label, val in self.values: | |
93 | w,h = self.GetTextExtent(label) | |
94 | if w > wmax: wmax = w | |
95 | if h > hmax: hmax = h | |
96 | self.linePos = wmax + 10 | |
97 | self.barHeight = hmax | |
98 | ||
99 | ||
100 | def GetBestHeight(self): | |
101 | return 2 * (self.barHeight + 1) * len(self.values) | |
102 | ||
103 | ||
104 | def Draw(self, dc, size): | |
105 | dc.SetFont(self.GetFont()) | |
106 | dc.SetTextForeground(wxBLUE) | |
107 | dc.SetBackground(wxBrush(self.GetBackgroundColour())) | |
108 | dc.Clear() | |
109 | dc.SetPen(wxPen(wxBLACK, 3, wxSOLID)) | |
110 | dc.DrawLine(self.linePos, 0, self.linePos, size.height-10) | |
111 | ||
112 | bh = ypos = self.barHeight | |
113 | for x in range(len(self.values)): | |
114 | label, val = self.values[x] | |
115 | dc.DrawText(label, 5, ypos) | |
116 | ||
117 | if val: | |
118 | color = self.colors[ x % len(self.colors) ] | |
119 | dc.SetPen(wxPen(color)) | |
120 | dc.SetBrush(wxBrush(color)) | |
121 | dc.DrawRectangle(self.linePos+3, ypos, val, bh) | |
122 | ||
123 | ypos = ypos + 2*bh | |
124 | if ypos > size.height-10: | |
125 | break | |
126 | ||
127 | ||
128 | def OnPaint(self, evt): | |
129 | size = self.GetSize() | |
130 | bmp = wxEmptyBitmap(size.width, size.height) | |
131 | dc = wxMemoryDC() | |
132 | dc.SelectObject(bmp) | |
133 | self.Draw(dc, size) | |
134 | ||
135 | wdc = wxPaintDC(self) | |
136 | wdc.BeginDrawing() | |
137 | wdc.Blit(0,0, size.width, size.height, dc, 0,0) | |
138 | wdc.EndDrawing() | |
139 | ||
140 | dc.SelectObject(wxNullBitmap) | |
141 | ||
142 | ||
143 | def OnEraseBackground(self, evt): | |
144 | pass | |
145 | ||
146 | ||
147 | ||
148 | ||
149 | #---------------------------------------------------------------------- | |
150 | ||
151 | class TestFrame(wxFrame): | |
152 | def __init__(self, parent, log): | |
153 | wxFrame.__init__(self, parent, -1, "Thread Test", size=(450,300)) | |
154 | self.log = log | |
155 | ||
156 | #self.CenterOnParent() | |
157 | ||
158 | panel = wxPanel(self, -1) | |
159 | panel.SetFont(wxFont(10, wxSWISS, wxNORMAL, wxBOLD)) | |
160 | wxStaticText(panel, -1, | |
161 | "This demo shows multiple threads interacting with this\n" | |
162 | "window by sending events to it, one thread for each bar.", | |
163 | wxPoint(5,5)) | |
164 | panel.Fit() | |
165 | ||
166 | self.graph = GraphWindow(self, ['Zero', 'One', 'Two', 'Three', 'Four', | |
167 | 'Five', 'Six', 'Seven']) | |
168 | self.graph.SetSize((450, self.graph.GetBestHeight())) | |
169 | ||
170 | sizer = wxBoxSizer(wxVERTICAL) | |
171 | sizer.Add(panel, 0, wxEXPAND) | |
172 | sizer.Add(self.graph, 1, wxEXPAND) | |
173 | ||
174 | self.SetSizer(sizer) | |
175 | self.SetAutoLayout(True) | |
176 | sizer.Fit(self) | |
177 | ||
178 | EVT_UPDATE_BARGRAPH(self, self.OnUpdate) | |
179 | self.threads = [] | |
180 | self.threads.append(CalcBarThread(self, 0, 50)) | |
181 | self.threads.append(CalcBarThread(self, 1, 75)) | |
182 | self.threads.append(CalcBarThread(self, 2, 100)) | |
183 | self.threads.append(CalcBarThread(self, 3, 150)) | |
184 | self.threads.append(CalcBarThread(self, 4, 225)) | |
185 | self.threads.append(CalcBarThread(self, 5, 300)) | |
186 | self.threads.append(CalcBarThread(self, 6, 250)) | |
187 | self.threads.append(CalcBarThread(self, 7, 175)) | |
188 | ||
189 | for t in self.threads: | |
190 | t.Start() | |
191 | ||
192 | EVT_CLOSE(self, self.OnCloseWindow) | |
193 | ||
194 | ||
195 | def OnUpdate(self, evt): | |
196 | self.graph.SetValue(evt.barNum, evt.value) | |
197 | self.graph.Refresh(False) | |
198 | ||
199 | ||
200 | def OnCloseWindow(self, evt): | |
201 | busy = wxBusyInfo("One moment please, waiting for threads to die...") | |
202 | wxYield() | |
203 | for t in self.threads: | |
204 | t.Stop() | |
205 | running = 1 | |
206 | while running: | |
207 | running = 0 | |
208 | for t in self.threads: | |
209 | running = running + t.IsRunning() | |
210 | time.sleep(0.1) | |
211 | self.Destroy() | |
212 | ||
213 | ||
214 | ||
215 | #---------------------------------------------------------------------- | |
216 | ||
217 | def runTest(frame, nb, log): | |
218 | win = TestFrame(frame, log) | |
219 | frame.otherWin = win | |
220 | win.Show(True) | |
221 | return None | |
222 | ||
223 | #---------------------------------------------------------------------- | |
224 | ||
225 | ||
226 | ||
227 | ||
228 | overview = """\ | |
229 | The main issue with multi-threaded GUI programming is the thread safty | |
230 | of the GUI itself. On most platforms the GUI is not thread safe and | |
231 | so any cross platform GUI Toolkit and applications written with it | |
232 | need to take that into account. | |
233 | ||
234 | The solution is to only allow interaction with the GUI from a single | |
235 | thread, but this often severly limits what can be done in an | |
236 | application and makes it difficult to use additional threads at all. | |
237 | ||
238 | Since wxPython already makes extensive use of event handlers, it is a | |
239 | logical extension to allow events to be sent to GUI objects from | |
240 | alternate threads. A function called wxPostEvent allows you to do | |
241 | this. It accepts an event and an event handler (window) and instead | |
242 | of sending the event immediately in the current context like | |
243 | ProcessEvent does, it processes it later from the context of the GUI | |
244 | thread. | |
245 | ||
246 | """ | |
247 | ||
248 | ||
249 | ||
250 | if __name__ == '__main__': | |
251 | import sys,os | |
252 | import run | |
253 | run.main(['', os.path.basename(sys.argv[0])]) | |
254 |