wxPython/contrib/dllwidget/dllwidget.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        dllwidget.cpp
   3 // Purpose:     Dynamically loadable C++ widget for wxPython
   4 // Author:      Vaclav Slavik
   5 // Created:     2001/12/03
   6 // RCS-ID:      $Id$
   7 // Copyright:   (c) 2001 Vaclav Slavik
   8 // Licence:     wxWindows licence
   9 /////////////////////////////////////////////////////////////////////////////
  10
  11 #ifdef __GNUG__
  12 #pragma implementation "dllwidget.h"
  13 #endif
  14
  15 // For compilers that support precompilation, includes "wx.h".
  16 #include "wx/wxprec.h"
  17
  18 #ifdef __BORLANDC__
  19     #pragma hdrstop
  20 #endif
  21
  22 #include "wx/defs.h"
  23 #include "wx/dynlib.h"
  24 #include "wx/sizer.h"
  25
  26 #include "dllwidget.h"
  27
  28
  29 IMPLEMENT_ABSTRACT_CLASS(wxDllWidget, wxPanel)
  30
  31 wxDllWidget::wxDllWidget(wxWindow *parent,
  32                          wxWindowID id,
  33                          const wxString& dllName, const wxString& className,
  34                          const wxPoint& pos, const wxSize& size,
  35                          long style)
  36     : wxPanel(parent, id, pos, size, wxTAB_TRAVERSAL | wxNO_BORDER,
  37               className + wxT("_container")),
  38     m_widget(NULL), m_lib(NULL), m_controlAdded(false)
  39 {
  40     SetBackgroundColour(wxColour(255, 0, 255));
  41     if ( !!className )
  42         LoadWidget(dllName, className, style);
  43 }
  44
  45 wxDllWidget::~wxDllWidget()
  46 {
  47     UnloadWidget();
  48 }
  49
  50 void wxDllWidget::AddChild(wxWindowBase *child)
  51 {
  52     wxASSERT_MSG( !m_controlAdded, wxT("Couldn't load two widgets into one container!") );
  53
  54     wxPanel::AddChild(child);
  55
  56     m_controlAdded = true;
  57     wxSizer *sizer = new wxBoxSizer(wxHORIZONTAL);
  58     sizer->Add((wxWindow*)child, 1, wxEXPAND);
  59     SetSizer(sizer);
  60     Layout();
  61 }
  62
  63
  64 wxString wxDllWidget::GetDllExt()
  65 {
  66     return wxDllLoader::GetDllExt();
  67 }
  68
  69
  70 typedef WXDLLEXPORT bool (*DLL_WidgetFactory_t)(const wxString& className,
  71                                                 wxWindow *parent,
  72                                                 long style,
  73                                                 wxWindow **classInst,
  74                                                 wxSendCommandFunc *cmdFunc);
  75
  76 bool wxDllWidget::LoadWidget(const wxString& dll, const wxString& className,
  77                              long style)
  78 {
  79     UnloadWidget();
  80
  81     // Load the dynamic library
  82     m_lib = new wxDynamicLibrary(dll);
  83     if ( !m_lib->IsLoaded() )
  84     {
  85         delete m_lib;
  86         m_lib = NULL;
  87         return false;
  88     }
  89
  90     DLL_WidgetFactory_t factory;
  91     factory = (DLL_WidgetFactory_t) m_lib->GetSymbol(wxT("DLL_WidgetFactory"));
  92     if ( factory == NULL)
  93     {
  94         delete m_lib;
  95         m_lib = NULL;
  96         return false;
  97     }
  98
  99     if ( !factory(className, this, style, &m_widget, &m_cmdFunc) )
 100     {
 101         delete m_widget;
 102         delete m_lib;
 103         m_lib = NULL;
 104         m_widget = NULL;
 105         return false;
 106     }
 107
 108     return true;
 109 }
 110
 111 void wxDllWidget::UnloadWidget()
 112 {
 113     if ( m_widget )
 114     {
 115         DestroyChildren();
 116         m_widget = NULL;
 117         delete m_lib;
 118         m_lib = NULL;
 119     }
 120 }
 121
 122 int wxDllWidget::SendCommand(int cmd, const wxString& param)
 123 {
 124     wxASSERT_MSG( m_widget && m_cmdFunc, wxT("Sending command to not loaded widget!"));
 125
 126     return m_cmdFunc(m_widget, cmd, param);
 127 }