File: embedded.cpp

package info (click to toggle)
wxwindows2.4 2.4.5.1.1
  • links: PTS
  • area: main
  • in suites: etch-m68k
  • size: 59,920 kB
  • ctags: 97,489
  • sloc: cpp: 610,307; ansic: 111,957; python: 103,357; makefile: 3,676; sh: 3,391; lex: 192; yacc: 128; xml: 95; pascal: 74
file content (292 lines) | stat: -rw-r--r-- 8,035 bytes parent folder | download | duplicates (3)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
//----------------------------------------------------------------------
// Name:        embedded.cpp
// Purpose:     To serve as an example of how to use wxPython from
//              within a C++ wxWindows program.
//
// Author:      Robin Dunn
//
// Created:     1-May-2002
// RCS-ID:      $Id: embedded.cpp,v 1.4.2.2 2004/01/15 17:40:13 RD Exp $
// Copyright:   (c) 2002 by Total Control Software
// Licence:     wxWindows license
//----------------------------------------------------------------------

// For compilers that support precompilation, includes "wx/wx.h".
#include <wx/wxprec.h>

#ifdef __BORLANDC__
    #pragma hdrstop
#endif

#ifndef WX_PRECOMP
    #include <wx/wx.h>
#endif

#include <wx/splitter.h>

#if defined(__WXGTK__) || defined(__WXMOTIF__) || defined(__WXMAC__) || defined(__WXMGL__)
    #include "mondrian.xpm"
#endif

// Import Python and wxPython headers
#include <Python.h>
#include <wxPython.h>

//----------------------------------------------------------------------
// Class definitions

class MyApp : public wxApp
{
public:
    virtual bool OnInit();
    virtual ~MyApp();
    void Init_wxPython();
private:
    PyThreadState* m_mainTState;
};


class MyFrame : public wxFrame
{
public:
    MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size);
    void RedirectStdio();
    wxWindow* DoPythonStuff(wxWindow* parent);
    void OnExit(wxCommandEvent& event);
    void OnPyFrame(wxCommandEvent& event);

private:
    DECLARE_EVENT_TABLE()
};

//----------------------------------------------------------------------
// MyApp methods


bool MyApp::OnInit()
{
    Init_wxPython();
    MyFrame *frame = new MyFrame(_T("Embedded wxPython Test"),
                                 wxPoint(50, 50), wxSize(700, 600));
    frame->Show(TRUE);
    return TRUE;
}


void MyApp::Init_wxPython()
{
    // Initialize Python
    Py_Initialize();
    PyEval_InitThreads();

    // Load the wxPython core API.  Imports the wxPython.wxc
    // module and sets a pointer to a function table located there.
    wxPyCoreAPI_IMPORT();

    // Ensure that the new classes defined in the wxPython wrappers are
    // recognised by the wx RTTI system.  (If you don't use wxWindows in
    // your C++ app you won't need to do this.)
    wxClassInfo::CleanUpClasses();
    wxClassInfo::InitializeClasses();

    // Save the current Python thread state and release the
    // Global Interpreter Lock.
    m_mainTState = wxPyBeginAllowThreads();
}


MyApp::~MyApp()
{
    // Restore the thread state and tell Python to cleanup after itself.
    wxPyEndAllowThreads(m_mainTState);
    Py_Finalize();
}

IMPLEMENT_APP(MyApp)

//----------------------------------------------------------------------

enum
{
    ID_EXIT=1001,
    ID_PYFRAME
};


BEGIN_EVENT_TABLE(MyFrame, wxFrame)
    EVT_MENU(ID_EXIT,      MyFrame::OnExit)
    EVT_MENU(ID_PYFRAME,   MyFrame::OnPyFrame)
END_EVENT_TABLE()



MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
    : wxFrame(NULL, -1, title, pos, size,
              wxDEFAULT_FRAME_STYLE|wxNO_FULL_REPAINT_ON_RESIZE)
{
    SetIcon(wxICON(mondrian));

    wxMenuBar* mbar = new wxMenuBar;
    wxMenu*    menu = new wxMenu;
    menu->Append(ID_PYFRAME, "Make wx&Python frame");
    menu->AppendSeparator();
    menu->Append(ID_EXIT, "&Close Frame\tAlt-X");
    mbar->Append(menu, "&File");
    SetMenuBar(mbar);

    CreateStatusBar();
    RedirectStdio();

    // Make some child windows from C++
    wxSplitterWindow* sp = new wxSplitterWindow(this, -1);
    wxPanel* p1 = new wxPanel(sp, -1);
    p1->SetFont(wxFont(12, wxSWISS, wxNORMAL, wxBOLD));
    new wxStaticText(p1, -1,
                 wxT("The frame, menu, splitter, this panel and this text were created in C++..."),
                 wxPoint(10,10));

    // And get a panel from Python
    wxWindow* p2 = DoPythonStuff(sp);

    sp->SplitHorizontally(p1, p2, GetClientSize().y/4);
}

void MyFrame::OnExit(wxCommandEvent& event)
{
    Close();
}


//----------------------------------------------------------------------
// This is were the fun begins...


char* python_code1 = "\
from wxPython.wx import wxFrame\n\
f = wxFrame(None, -1, 'Hello from wxPython!', size=(250, 150))\n\
f.Show()\n\
";

void MyFrame::OnPyFrame(wxCommandEvent& event)
{
    // For simple Python code that doesn't have to interact with the
    // C++ code in any way, you can execute it with PyRun_SimpleString.


    // First, whenever you do anything with Python objects or code, you
    // *MUST* aquire the Global Interpreter Lock and block other
    // Python threads from running.
    wxPyBeginBlockThreads();

    // Execute the code in the __main__ module
    PyRun_SimpleString(python_code1);

    // Finally, release the GIL and let other Python threads run.
    wxPyEndBlockThreads();
}


void MyFrame::RedirectStdio()
{
    // This is a helpful little tidbit to help debugging and such.  It
    // redirects Python's stdout and stderr to a window that will popup
    // only on demand when something is printed, like a traceback.
    char* python_redirect = "\
import sys\n\
from wxPython.wx import wxPyOnDemandOutputWindow\n\
output = wxPyOnDemandOutputWindow()\n\
sys.stdin = sys.stderr = output\n\
";
    wxPyBeginBlockThreads();
    PyRun_SimpleString(python_redirect);
    wxPyEndBlockThreads();
}




char* python_code2 = "\
import embedded_sample\n\
\n\
def makeWindow(parent):\n\
    win = embedded_sample.MyPanel(parent)\n\
    return win\n\
";

wxWindow* MyFrame::DoPythonStuff(wxWindow* parent)
{
    // More complex embedded situations will require passing C++ objects to
    // Python and/or returning objects from Python to be used in C++.  This
    // sample shows one way to do it.  NOTE: The above code could just have
    // easily come from a file, or the whole thing could be in the Python
    // module that is imported and manipulated directly in this C++ code.  See
    // the Python API for more details.

    wxWindow* window = NULL;
    PyObject* result;

    // As always, first grab the GIL
    wxPyBeginBlockThreads();

    // Now make a dictionary to serve as the global namespace when the code is
    // executed.  Put a reference to the builtins module in it.  (Yes, the
    // names are supposed to be different, I don't know why...)
    PyObject* globals = PyDict_New();
    PyObject* builtins = PyImport_ImportModule("__builtin__");
    PyDict_SetItemString(globals, "__builtins__", builtins);
    Py_DECREF(builtins);

    // Execute the code to make the makeWindow function
    result = PyRun_String(python_code2, Py_file_input, globals, globals);
    // Was there an exception?
    if (! result) {
        PyErr_Print();
        wxPyEndBlockThreads();
        return NULL;
    }
    Py_DECREF(result);

    // Now there should be an object named 'makeWindow' in the dictionary that
    // we can grab a pointer to:
    PyObject* func = PyDict_GetItemString(globals, "makeWindow");
    wxASSERT(PyCallable_Check(func));

    // Now build an argument tuple and call the Python function.  Notice the
    // use of another wxPython API to take a wxWindows object and build a
    // wxPython object that wraps it.
    PyObject* arg = wxPyMake_wxObject(parent);
    wxASSERT(arg != NULL);

    PyObject* tuple = PyTuple_New(1);
    PyTuple_SET_ITEM(tuple, 0, arg);
    result = PyEval_CallObject(func, tuple);

    // Was there an exception?
    if (! result)
        PyErr_Print();
    else {
        // Otherwise, get the returned window out of Python-land and
        // into C++-ville...
        bool error = SWIG_GetPtrObj(result, (void**)&window, "_wxWindow_p");
        wxASSERT_MSG(!error, wxT("Returned object was not a wxWindow!"));
        Py_DECREF(result);
    }

    // Release the python objects we still have
    Py_DECREF(globals);
    Py_DECREF(tuple);

    // Finally, after all Python stuff is done, release the GIL
    wxPyEndBlockThreads();

    return window;
}


//----------------------------------------------------------------------