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