samples/dnd/dnd.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        dnd.cpp
   3 // Purpose:     Drag and drop sample
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     04/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #include "wx/wxprec.h"
  13
  14 #ifdef __BORLANDC__
  15 #pragma hdrstop
  16 #endif
  17
  18 #ifndef WX_PRECOMP
  19 #include "wx/wx.h"
  20 #endif
  21
  22 #include  "wx/intl.h"
  23 #include  "wx/log.h"
  24
  25 #include  "wx/dnd.h"
  26
  27 #ifdef __WXMOTIF__
  28 #error Sorry, drag and drop is not yet implemented on wxMotif.
  29 #endif
  30
  31 #if defined(__WXGTK__) || defined(__WXMOTIF__)
  32 #include "mondrian.xpm"
  33 #endif
  34
  35 // ----------------------------------------------------------------------------
  36 // Derive two simple classes which just put in the listbox the strings (text or
  37 // file names) we drop on them
  38 // ----------------------------------------------------------------------------
  39
  40 class DnDText : public wxTextDropTarget
  41 {
  42 public:
  43   DnDText(wxListBox *pOwner) { m_pOwner = pOwner; }
  44
  45   virtual bool OnDropText(long x, long y, const char *psz );
  46
  47 private:
  48   wxListBox *m_pOwner;
  49 };
  50
  51 class DnDFile : public wxFileDropTarget
  52 {
  53 public:
  54   DnDFile(wxListBox *pOwner) { m_pOwner = pOwner; }
  55
  56   virtual bool OnDropFiles(long x, long y,
  57                            size_t nFiles, const char * const aszFiles[] );
  58
  59 private:
  60   wxListBox *m_pOwner;
  61 };
  62
  63 // ----------------------------------------------------------------------------
  64 // Define a new application type
  65 // ----------------------------------------------------------------------------
  66
  67 class DnDApp : public wxApp
  68 {
  69 public:
  70   bool OnInit();
  71 };
  72
  73 IMPLEMENT_APP(DnDApp);
  74
  75 // ----------------------------------------------------------------------------
  76 // Define a new frame type
  77 // ----------------------------------------------------------------------------
  78 class DnDFrame : public wxFrame
  79 {
  80 public:
  81   DnDFrame(wxFrame *frame, char *title, int x, int y, int w, int h);
  82  ~DnDFrame();
  83
  84   void OnPaint(wxPaintEvent& event);
  85   void OnQuit (wxCommandEvent& event);
  86   void OnAbout(wxCommandEvent& event);
  87   void OnDrag (wxCommandEvent& event);
  88   void OnHelp (wxCommandEvent& event);
  89   void OnLogClear(wxCommandEvent& event);
  90
  91   void OnLeftDown(wxMouseEvent& event);
  92   void OnRightDown(wxMouseEvent& event);
  93
  94   bool OnClose();
  95
  96   DECLARE_EVENT_TABLE()
  97
  98 private:
  99   wxListBox  *m_ctrlFile,
 100              *m_ctrlText;
 101   wxTextCtrl *m_ctrlLog;
 102
 103   wxLog *m_pLog, *m_pLogPrev;
 104
 105   wxString m_strText;
 106 };
 107
 108 // ----------------------------------------------------------------------------
 109 // IDs for the menu commands
 110 // ----------------------------------------------------------------------------
 111
 112 enum
 113 {
 114   Menu_Quit = 1,
 115   Menu_Drag,
 116   Menu_About = 101,
 117   Menu_Help,
 118   Menu_Clear,
 119 };
 120
 121 BEGIN_EVENT_TABLE(DnDFrame, wxFrame)
 122   EVT_MENU(Menu_Quit,  DnDFrame::OnQuit)
 123   EVT_MENU(Menu_About, DnDFrame::OnAbout)
 124   EVT_MENU(Menu_Drag,  DnDFrame::OnDrag)
 125   EVT_MENU(Menu_Help,  DnDFrame::OnHelp)
 126   EVT_MENU(Menu_Clear, DnDFrame::OnLogClear)
 127   EVT_LEFT_DOWN(       DnDFrame::OnLeftDown)
 128   EVT_RIGHT_DOWN(      DnDFrame::OnRightDown)
 129   EVT_PAINT(           DnDFrame::OnPaint)
 130 END_EVENT_TABLE()
 131
 132 // `Main program' equivalent, creating windows and returning main app frame
 133 bool DnDApp::OnInit()
 134 {
 135   // create the main frame window
 136   DnDFrame *frame = new DnDFrame((wxFrame  *) NULL, "Drag & Drop wxWindows App",
 137                                  50, 50, 450, 340);
 138
 139   // activate it
 140   frame->Show(TRUE);
 141
 142   SetTopWindow(frame);
 143
 144   return TRUE;
 145 }
 146
 147 DnDFrame::DnDFrame(wxFrame *frame, char *title, int x, int y, int w, int h)
 148         : wxFrame(frame, -1, title, wxPoint(x, y), wxSize(w, h)),
 149           m_strText("wxWindows drag & drop works :-)")
 150
 151 {
 152 //  SetBackgroundColour(* wxWHITE);
 153
 154   // frame icon and status bar
 155   SetIcon(wxICON(mondrian));
 156
 157 //  const int widths[] = { -1 };
 158   CreateStatusBar();
 159
 160   // construct menu
 161   wxMenu *file_menu = new wxMenu;
 162   file_menu->Append(Menu_Drag, "&Test drag...");
 163   file_menu->AppendSeparator();
 164   file_menu->Append(Menu_Quit, "E&xit");
 165
 166   wxMenu *log_menu = new wxMenu;
 167   log_menu->Append(Menu_Clear, "Clear");
 168
 169   wxMenu *help_menu = new wxMenu;
 170   help_menu->Append(Menu_Help, "&Help...");
 171   help_menu->AppendSeparator();
 172   help_menu->Append(Menu_About, "&About");
 173
 174   wxMenuBar *menu_bar = new wxMenuBar;
 175   menu_bar->Append(file_menu, "&File");
 176   menu_bar->Append(log_menu,  "&Log");
 177   menu_bar->Append(help_menu, "&Help");
 178
 179   SetMenuBar(menu_bar);
 180
 181   // make a panel with 3 subwindows
 182   wxPoint pos(0, 0);
 183   wxSize  size(400, 200);
 184
 185   wxString strFile("Drop files here!"), strText("Drop text on me");
 186
 187   m_ctrlFile  = new wxListBox(this, -1, pos, size, 1, &strFile, wxLB_HSCROLL);
 188   m_ctrlText  = new wxListBox(this, -1, pos, size, 1, &strText, wxLB_HSCROLL);
 189
 190   m_ctrlLog   = new wxTextCtrl(this, -1, "", pos, size,
 191                                wxTE_MULTILINE | wxTE_READONLY |
 192                                wxSUNKEN_BORDER );
 193
 194   // redirect log messages to the text window (don't forget to delete it!)
 195   m_pLog = new wxLogTextCtrl(m_ctrlLog);
 196   m_pLogPrev = wxLog::SetActiveTarget(m_pLog);
 197
 198   // associate drop targets with 2 text controls
 199   m_ctrlFile->SetDropTarget(new DnDFile(m_ctrlFile));
 200   m_ctrlText->SetDropTarget( new DnDText(m_ctrlText) );
 201
 202   wxLayoutConstraints *c;
 203
 204   // Top-left listbox
 205   c = new wxLayoutConstraints;
 206   c->left.SameAs(this, wxLeft);
 207   c->top.SameAs(this, wxTop);
 208   c->right.PercentOf(this, wxRight, 50);
 209   c->height.PercentOf(this, wxHeight, 40);
 210   m_ctrlFile->SetConstraints(c);
 211
 212   // Top-right listbox
 213   c = new wxLayoutConstraints;
 214   c->left.SameAs    (m_ctrlFile, wxRight);
 215   c->top.SameAs     (this, wxTop);
 216   c->right.SameAs   (this, wxRight);
 217   c->height.PercentOf(this, wxHeight, 40);
 218   m_ctrlText->SetConstraints(c);
 219
 220   // Lower text control
 221   c = new wxLayoutConstraints;
 222   c->left.SameAs    (this, wxLeft);
 223   c->right.SameAs   (this, wxRight);
 224   c->height.PercentOf(this, wxHeight, 40);
 225   c->top.SameAs(m_ctrlText, wxBottom);
 226   m_ctrlLog->SetConstraints(c);
 227
 228   SetAutoLayout(TRUE);
 229 }
 230
 231 void DnDFrame::OnQuit(wxCommandEvent& /* event */)
 232 {
 233   Close(TRUE);
 234 }
 235
 236 void DnDFrame::OnPaint(wxPaintEvent& /*event*/)
 237 {
 238   int w = 0;
 239   int h = 0;
 240   GetClientSize( &w, &h );
 241
 242   wxPaintDC dc(this);
 243   dc.SetFont( wxFont( 24, wxDECORATIVE, wxNORMAL, wxNORMAL, FALSE, "charter" ) );
 244   dc.DrawText( "Drag text from here!", 20, h-22 );
 245 }
 246
 247 void DnDFrame::OnDrag(wxCommandEvent& /* event */)
 248 {
 249   wxString strText = wxGetTextFromUser
 250   (
 251     "After you enter text in this dialog, press any mouse\n"
 252     "button in the bottom (empty) part of the frame and \n"
 253     "drag it anywhere - you will be in fact dragging the\n"
 254     "text object containing this text",
 255     "Please enter some text", m_strText, this
 256   );
 257
 258   m_strText = strText;
 259 }
 260
 261 void DnDFrame::OnAbout(wxCommandEvent& /* event */)
 262 {
 263   wxMessageDialog dialog(this,
 264                          "Drag-&-Drop Demo\n"
 265                          "Please see \"Help|Help...\" for details\n"
 266                          "Copyright (c) 1998 Vadim Zeitlin",
 267                          "About wxDnD");
 268
 269   dialog.ShowModal();
 270 }
 271
 272 void DnDFrame::OnHelp(wxCommandEvent& /* event */)
 273 {
 274   wxMessageDialog dialog(this,
 275 "This small program demonstrates drag & drop support in wxWindows. The program window\n"
 276 "consists of 3 parts: the bottom pane is for debug messages, so that you can see what's\n"
 277 "going on inside. The top part is split into 2 listboxes, the left one accepts files\n"
 278 "and the right one accepts text.\n"
 279 "\n"
 280 "To test wxDropTarget: open wordpad (write.exe), select some text in it and drag it to\n"
 281 "the right listbox (you'll notice the usual visual feedback, i.e. the cursor will change).\n"
 282 "Also, try dragging some files (you can select several at once) from Windows Explorer (or \n"
 283 "File Manager) to the left pane. Hold down Ctrl/Shift keys when you drop text (doesn't \n"
 284 "work with files) and see what changes.\n"
 285 "\n"
 286 "To test wxDropSource: just press any mouse button on the empty zone of the window and drag\n"
 287 "it to wordpad or any other droptarget accepting text (and of course you can just drag it\n"
 288 "to the right pane). Due to a lot of trace messages, the cursor might take some time to \n"
 289 "change, don't release the mouse button until it does. You can change the string being\n"
 290 "dragged in in \"File|Test drag...\" dialog.\n"
 291 "\n"
 292 "\n"
 293 "Please send all questions/bug reports/suggestions &c to \n"
 294 "Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>",
 295                         "wxDnD Help");
 296
 297   dialog.ShowModal();
 298 }
 299
 300 void DnDFrame::OnLogClear(wxCommandEvent& /* event */ )
 301 {
 302   m_ctrlLog->Clear();
 303 }
 304
 305 bool DnDFrame::OnClose()
 306 {
 307   return TRUE;
 308 }
 309
 310 void DnDFrame::OnLeftDown(wxMouseEvent &WXUNUSED(event) )
 311 {
 312   if ( !m_strText.IsEmpty() )
 313   {
 314     // start drag operation
 315 #ifdef __WXMSW__
 316     wxTextDataObject textData(m_strText);
 317     wxDropSource dragSource( textData, this );
 318 #else
 319     wxDropSource dragSource( new wxTextDataObject (m_strText), this );
 320 #endif
 321     const char *pc;
 322
 323     switch ( dragSource.DoDragDrop(TRUE) )
 324     {
 325       case wxDragError:   pc = "Error!";    break;
 326       case wxDragNone:    pc = "Nothing";   break;
 327       case wxDragCopy:    pc = "Copied";    break;
 328       case wxDragMove:    pc = "Moved";     break;
 329       case wxDragCancel:  pc = "Cancelled"; break;
 330       default:                    pc = "Huh?";      break;
 331     }
 332
 333     SetStatusText(wxString("Drag result: ") + pc);
 334   }
 335 }
 336
 337 void DnDFrame::OnRightDown(wxMouseEvent &event )
 338 {
 339   wxMenu *menu = new wxMenu;
 340
 341   menu->Append(Menu_Drag, "&Test drag...");
 342   menu->Append(Menu_About, "&About");
 343   menu->Append(Menu_Quit, "E&xit");
 344
 345   PopupMenu( menu, event.GetX(), event.GetY() );
 346 }
 347
 348 DnDFrame::~DnDFrame()
 349 {
 350   if ( m_pLog != NULL ) {
 351     if ( wxLog::SetActiveTarget(m_pLogPrev) == m_pLog )
 352       delete m_pLog;
 353   }
 354 }
 355
 356 // ----------------------------------------------------------------------------
 357 // Notifications called by the base class
 358 // ----------------------------------------------------------------------------
 359 bool DnDText::OnDropText(long, long, const char *psz)
 360 {
 361   m_pOwner->Append(psz);
 362
 363   return TRUE;
 364 }
 365
 366 bool DnDFile::OnDropFiles(long, long, size_t nFiles,
 367                           const char * const aszFiles[])
 368 {
 369   wxString str;
 370   str.Printf("%d files dropped", nFiles);
 371   m_pOwner->Append(str);
 372   for ( size_t n = 0; n < nFiles; n++ ) {
 373     m_pOwner->Append(aszFiles[n]);
 374   }
 375
 376   return TRUE;
 377 }