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