samples/dnd/dnd.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        dnd.cpp
   3 // Purpose:     Drag and drop sample
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     13.11.97
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
   9 // Licence:     wxWindows license
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // headers & declarations
  14 // ============================================================================
  15
  16 // For compilers that support precompilation, includes "wx.h".
  17 #include "wx/wxprec.h"
  18
  19 #ifdef __BORLANDC__
  20 #pragma hdrstop
  21 #endif
  22
  23 #ifndef WX_PRECOMP
  24 #include "wx/wx.h"
  25 #endif
  26
  27 #include  "wx/intl.h"
  28 #include  "wx/log.h"
  29
  30 #include  "wx/dnd.h"
  31
  32 // ----------------------------------------------------------------------------
  33 // Derive 2 simple classes which just put in the listbox the strings (text or
  34 // file names) we drop on them
  35 // ----------------------------------------------------------------------------
  36 class DnDText : public wxTextDropTarget
  37 {
  38 public:
  39   DnDText(wxListBox *pOwner) { m_pOwner = pOwner; }
  40
  41   virtual bool OnDropText(long x, long y, const char *psz);
  42
  43 private:
  44   wxListBox *m_pOwner;
  45 };
  46
  47 class DnDFile : public wxFileDropTarget
  48 {
  49 public:
  50   DnDFile(wxListBox *pOwner) { m_pOwner = pOwner; }
  51
  52   virtual bool OnDropFiles(long x, long y,
  53                            size_t nFiles, const char * const aszFiles[]);
  54
  55 private:
  56   wxListBox *m_pOwner;
  57 };
  58
  59 // ----------------------------------------------------------------------------
  60 // Define a new application type
  61 // ----------------------------------------------------------------------------
  62 class DnDApp : public wxApp
  63 {
  64 public:
  65   bool OnInit();
  66 };
  67
  68 IMPLEMENT_APP(DnDApp);
  69
  70 // ----------------------------------------------------------------------------
  71 // Define a new frame type
  72 // ----------------------------------------------------------------------------
  73 class DnDFrame : public wxFrame
  74 {
  75 public:
  76   DnDFrame(wxFrame *frame, char *title, int x, int y, int w, int h);
  77  ~DnDFrame();
  78
  79   void OnPaint(wxPaintEvent& event);
  80   void OnQuit (wxCommandEvent& event);
  81   void OnAbout(wxCommandEvent& event);
  82   void OnHelp (wxCommandEvent& event);
  83
  84   bool OnClose();
  85
  86   DECLARE_EVENT_TABLE()
  87
  88 private:
  89   wxListBox  *m_ctrlFile,
  90              *m_ctrlText;
  91   wxTextCtrl *m_ctrlLog;
  92
  93   wxLogTarget *m_pLog, *m_pLogPrev;
  94 };
  95
  96 // ----------------------------------------------------------------------------
  97 // IDs for the menu commands
  98 // ----------------------------------------------------------------------------
  99 enum
 100 {
 101   Menu_Quit = 1,
 102   Menu_About = 101,
 103   Menu_Help,
 104 };
 105
 106 BEGIN_EVENT_TABLE(DnDFrame, wxFrame)
 107         EVT_MENU(Menu_Quit,  DnDFrame::OnQuit)
 108         EVT_MENU(Menu_About, DnDFrame::OnAbout)
 109         EVT_MENU(Menu_Help,  DnDFrame::OnHelp)
 110
 111   //EVT_PAINT(DnDFrame::OnPaint)
 112 END_EVENT_TABLE()
 113
 114 // `Main program' equivalent, creating windows and returning main app frame
 115 bool DnDApp::OnInit(void)
 116 {
 117   // create the main frame window
 118   DnDFrame *frame = new DnDFrame(NULL, "Drag & Drop wxWindows App",
 119                                  50, 50, 450, 340);
 120
 121   // activate it
 122   frame->Show(TRUE);
 123
 124   SetTopWindow(frame);
 125
 126   return TRUE;
 127 }
 128
 129 DnDFrame::DnDFrame(wxFrame *frame, char *title, int x, int y, int w, int h)
 130         : wxFrame(frame, -1, title, wxPoint(x, y), wxSize(w, h))
 131 {
 132   SetIcon(wxIcon("mondrian"));
 133
 134   // construct menu
 135   wxMenu *file_menu = new wxMenu;
 136   file_menu->Append(Menu_Help, "&Help");
 137   file_menu->Append(Menu_About, "&About");
 138   file_menu->AppendSeparator();
 139   file_menu->Append(Menu_Quit, "E&xit");
 140   wxMenuBar *menu_bar = new wxMenuBar;
 141   menu_bar->Append(file_menu, "&File");
 142   SetMenuBar(menu_bar);
 143
 144   // make a panel with 3 subwindows
 145   wxPoint pos(0, 0);
 146   wxSize  size(400, 200);
 147
 148   wxString strFile("Drop files here!"), strText("Drop text on me");
 149
 150   m_ctrlFile  = new wxListBox(this, -1, pos, size, 1, &strFile, wxLB_HSCROLL);
 151   m_ctrlText  = new wxListBox(this, -1, pos, size, 1, &strText, wxLB_HSCROLL);
 152   m_ctrlLog   = new wxTextCtrl(this, -1, "", pos, size,
 153                                wxTE_MULTILINE | wxTE_READONLY |
 154                                wxSUNKEN_BORDER| wxHSCROLL);
 155
 156   // redirect log messages to the text window (don't forget to delete it!)
 157 //  m_pLog = new wxLogTextCtrl(m_ctrlLog);
 158   m_pLog = NULL;
 159   m_pLogPrev = wxLogTarget::SetActiveTarget(m_pLog);
 160
 161   // associate drop targets with 2 text controls
 162   m_ctrlFile->SetDropTarget(new DnDFile(m_ctrlFile));
 163   m_ctrlText->SetDropTarget(new DnDText(m_ctrlText));
 164
 165   wxLayoutConstraints *c;
 166
 167   c = new wxLayoutConstraints;
 168   c->left.SameAs                (this, wxLeft);
 169   c->top.SameAs                 (this, wxTop);
 170   c->right.PercentOf(this, wxRight, 50);
 171   c->height.PercentOf(this, wxHeight, 50);
 172   m_ctrlFile->SetConstraints(c);
 173
 174   c = new wxLayoutConstraints;
 175   c->left.SameAs    (m_ctrlFile, wxRight);
 176   c->top.SameAs     (this, wxTop);
 177   c->right.SameAs   (this, wxRight);
 178   c->height.PercentOf(this, wxHeight, 50);
 179   m_ctrlText->SetConstraints(c);
 180
 181   c = new wxLayoutConstraints;
 182   c->left.SameAs    (this, wxLeft);
 183   c->right.SameAs   (this, wxRight);
 184   c->height.PercentOf(this, wxHeight, 50);
 185   c->bottom.SameAs(this, wxBottom);
 186
 187   m_ctrlLog->SetConstraints(c);
 188
 189   SetAutoLayout(TRUE);
 190 }
 191
 192 void DnDFrame::OnQuit(wxCommandEvent& /* event */)
 193 {
 194   Close(TRUE);
 195 }
 196
 197 void DnDFrame::OnAbout(wxCommandEvent& /* event */)
 198 {
 199   wxMessageDialog dialog(this,
 200                          "Drag-&-Drop Demo\n"
 201                          "Please see File|Help for details",
 202                          "About wxDnD");
 203
 204   dialog.ShowModal();
 205 }
 206
 207 void DnDFrame::OnHelp(wxCommandEvent& /* event */)
 208 {
 209   wxMessageDialog dialog(this,
 210 "This small program demonstrates drag & drop support in wxWindows.\n"
 211 "The program window consists of 3 parts: the bottom pane is for\n"
 212 "debug messages, so that you can see what's going on inside.\n"
 213 "The top part is split into 2 listboxes, the left one accepts\n"
 214 "files and the right one accepts text.\n"
 215 "\n"
 216 "To test it: open wordpad (write.exe), select some text in it and\n"
 217 "drag it to the right listbox (you'll notice the usual visual\n"
 218 "feedback, i.e. the cursor will change). Also, try dragging some\n"
 219 "files (you can select several at once) from Windows Explorer (or\n"
 220 "File Manager) to the left pane. Hold down Ctrl/Shift keys when\n"
 221 "you drop text (doesn't work with files) and see what changes.\n"
 222 "\n"
 223 "Please address any questions/bug reports/suggestions &c to\n"
 224 "Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>",
 225                         "wxDnD Help");
 226
 227   dialog.ShowModal();
 228 }
 229
 230 bool DnDFrame::OnClose()
 231 {
 232   return TRUE;
 233 }
 234
 235 DnDFrame::~DnDFrame()
 236 {
 237   if ( m_pLog != NULL ) {
 238     if ( wxLogTarget::SetActiveTarget(m_pLogPrev) == m_pLog )
 239       delete m_pLog;
 240   }
 241 }
 242
 243 // ----------------------------------------------------------------------------
 244 // Notifications called by the base class
 245 // ----------------------------------------------------------------------------
 246 bool DnDText::OnDropText(long, long, const char *psz)
 247 {
 248   m_pOwner->Append(psz);
 249
 250   return TRUE;
 251 }
 252
 253 bool DnDFile::OnDropFiles(long, long, size_t nFiles,
 254                           const char * const aszFiles[])
 255 {
 256   wxString str;
 257   str.Printf("%d files dropped", nFiles);
 258   m_pOwner->Append(str);
 259   for ( size_t n = 0; n < nFiles; n++ ) {
 260     m_pOwner->Append(aszFiles[n]);
 261   }
 262
 263   return TRUE;
 264 }