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(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 #ifdef __WXMSW__  // it's not supported (yet) on other platforms
 195   m_ctrlFile->SetDropTarget(new DnDFile(m_ctrlFile));
 196 #endif  //MSW
 197   m_ctrlText->SetDropTarget(new DnDText(m_ctrlText));
 198
 199   wxLayoutConstraints *c;
 200
 201   // Top-left listbox
 202   c = new wxLayoutConstraints;
 203   c->left.SameAs                (this, wxLeft);
 204   c->top.SameAs                 (this, wxTop);
 205   c->right.PercentOf(this, wxRight, 50);
 206   c->height.PercentOf(this, wxHeight, 40);
 207   m_ctrlFile->SetConstraints(c);
 208
 209   // Top-right listbox
 210   c = new wxLayoutConstraints;
 211   c->left.SameAs    (m_ctrlFile, wxRight);
 212   c->top.SameAs     (this, wxTop);
 213   c->right.SameAs   (this, wxRight);
 214   c->height.PercentOf(this, wxHeight, 40);
 215   m_ctrlText->SetConstraints(c);
 216
 217   // Lower text control
 218   c = new wxLayoutConstraints;
 219   c->left.SameAs    (this, wxLeft);
 220   c->right.SameAs   (this, wxRight);
 221   c->height.PercentOf(this, wxHeight, 40);
 222   c->top.SameAs(m_ctrlText, wxBottom);
 223
 224   m_ctrlLog->SetConstraints(c);
 225
 226   SetAutoLayout(TRUE);
 227 }
 228
 229 void DnDFrame::OnQuit(wxCommandEvent& /* event */)
 230 {
 231   Close(TRUE);
 232 }
 233
 234 void DnDFrame::OnDrag(wxCommandEvent& /* event */)
 235 {
 236   wxString strText = wxGetTextFromUser
 237   (
 238     "After you enter text in this dialog, press any mouse\n"
 239     "button in the bottom (empty) part of the frame and \n"
 240     "drag it anywhere - you will be in fact dragging the\n"
 241     "text object containing this text",
 242     "Please enter some text", m_strText, this
 243   );
 244
 245   m_strText = strText;
 246 }
 247
 248 void DnDFrame::OnAbout(wxCommandEvent& /* event */)
 249 {
 250   wxMessageDialog dialog(this,
 251                          "Drag-&-Drop Demo\n"
 252                          "Please see \"Help|Help...\" for details\n"
 253                          "Copyright (c) 1998 Vadim Zeitlin",
 254                          "About wxDnD");
 255
 256   dialog.ShowModal();
 257 }
 258
 259 void DnDFrame::OnHelp(wxCommandEvent& /* event */)
 260 {
 261   wxMessageDialog dialog(this,
 262 "This small program demonstrates drag & drop support in wxWindows. The program window\n"
 263 "consists of 3 parts: the bottom pane is for debug messages, so that you can see what's\n"
 264 "going on inside. The top part is split into 2 listboxes, the left one accepts files\n"
 265 "and the right one accepts text.\n"
 266 "\n"
 267 "To test wxDropTarget: open wordpad (write.exe), select some text in it and drag it to\n"
 268 "the right listbox (you'll notice the usual visual feedback, i.e. the cursor will change).\n"
 269 "Also, try dragging some files (you can select several at once) from Windows Explorer (or \n"
 270 "File Manager) to the left pane. Hold down Ctrl/Shift keys when you drop text (doesn't \n"
 271 "work with files) and see what changes.\n"
 272 "\n"
 273 "To test wxDropSource: just press any mouse button on the empty zone of the window and drag\n"
 274 "it to wordpad or any other droptarget accepting text (and of course you can just drag it\n"
 275 "to the right pane). Due to a lot of trace messages, the cursor might take some time to \n"
 276 "change, don't release the mouse button until it does. You can change the string being\n"
 277 "dragged in in \"File|Test drag...\" dialog.\n"
 278 "\n"
 279 "\n"
 280 "Please send all questions/bug reports/suggestions &c to \n"
 281 "Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>",
 282                         "wxDnD Help");
 283
 284   dialog.ShowModal();
 285 }
 286
 287 void DnDFrame::OnLogClear(wxCommandEvent& /* event */ )
 288 {
 289   m_ctrlLog->Clear();
 290 }
 291
 292 bool DnDFrame::OnClose()
 293 {
 294   return TRUE;
 295 }
 296
 297 void DnDFrame::OnLeftDown(wxMouseEvent &WXUNUSED(event) )
 298 {
 299   if ( !m_strText.IsEmpty() ) {
 300     // start drag operation
 301
 302     wxTextDataObject data(m_strText);
 303     wxDropSource dragSource(data, this);
 304     const char *pc;
 305
 306     switch ( dragSource.DoDragDrop(TRUE) ) {
 307       case wxDropSource::Error:   pc = "Error!";    break;
 308       case wxDropSource::None:    pc = "Nothing";   break;
 309       case wxDropSource::Copy:    pc = "Copied";    break;
 310       case wxDropSource::Move:    pc = "Moved";     break;
 311       case wxDropSource::Cancel:  pc = "Cancelled"; break;
 312       default:                    pc = "Huh?";      break;
 313     }
 314
 315     SetStatusText(wxString("Drag result: ") + pc);
 316   }
 317 }
 318
 319 void DnDFrame::OnRightDown(wxMouseEvent &event )
 320 {
 321   wxMenu *menu = new wxMenu;
 322
 323   menu->Append(Menu_Drag, "&Test drag...");
 324   menu->Append(Menu_About, "&About");
 325   menu->Append(Menu_Quit, "E&xit");
 326
 327   PopupMenu( menu, event.GetX(), event.GetY() );
 328 }
 329
 330 DnDFrame::~DnDFrame()
 331 {
 332   if ( m_pLog != NULL ) {
 333     if ( wxLog::SetActiveTarget(m_pLogPrev) == m_pLog )
 334       delete m_pLog;
 335   }
 336 }
 337
 338 // ----------------------------------------------------------------------------
 339 // Notifications called by the base class
 340 // ----------------------------------------------------------------------------
 341 bool DnDText::OnDropText(long, long, const char *psz)
 342 {
 343   m_pOwner->Append(psz);
 344
 345   return TRUE;
 346 }
 347
 348 bool DnDFile::OnDropFiles(long, long, size_t nFiles,
 349                           const char * const aszFiles[])
 350 {
 351   wxString str;
 352   str.Printf("%d files dropped", nFiles);
 353   m_pOwner->Append(str);
 354   for ( size_t n = 0; n < nFiles; n++ ) {
 355     m_pOwner->Append(aszFiles[n]);
 356   }
 357
 358   return TRUE;
 359 }