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 __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(       DnDFrame::OnLeftDown)
 121   EVT_RIGHT_DOWN(      DnDFrame::OnRightDown)
 122   EVT_PAINT(           DnDFrame::OnPaint)
 123 END_EVENT_TABLE()
 124
 125 // `Main program' equivalent, creating windows and returning main app frame
 126 bool DnDApp::OnInit()
 127 {
 128   // create the main frame window
 129   DnDFrame *frame = new DnDFrame((wxFrame  *) NULL, "Drag & Drop wxWindows App",
 130                                  50, 50, 450, 340);
 131
 132   // activate it
 133   frame->Show(TRUE);
 134
 135   SetTopWindow(frame);
 136
 137   return TRUE;
 138 }
 139
 140 DnDFrame::DnDFrame(wxFrame *frame, char *title, int x, int y, int w, int h)
 141         : wxFrame(frame, -1, title, wxPoint(x, y), wxSize(w, h)),
 142           m_strText("wxWindows drag & drop works :-)")
 143
 144 {
 145
 146   // frame icon and status bar
 147   SetIcon(wxICON(mondrian));
 148
 149 //  const int widths[] = { -1 };
 150   CreateStatusBar();
 151
 152   // construct menu
 153   wxMenu *file_menu = new wxMenu;
 154   file_menu->Append(Menu_Drag, "&Test drag...");
 155   file_menu->AppendSeparator();
 156   file_menu->Append(Menu_Quit, "E&xit");
 157
 158   wxMenu *log_menu = new wxMenu;
 159   log_menu->Append(Menu_Clear, "Clear");
 160
 161   wxMenu *help_menu = new wxMenu;
 162   help_menu->Append(Menu_Help, "&Help...");
 163   help_menu->AppendSeparator();
 164   help_menu->Append(Menu_About, "&About");
 165
 166   wxMenuBar *menu_bar = new wxMenuBar;
 167   menu_bar->Append(file_menu, "&File");
 168   menu_bar->Append(log_menu,  "&Log");
 169   menu_bar->Append(help_menu, "&Help");
 170
 171   SetMenuBar(menu_bar);
 172
 173   // make a panel with 3 subwindows
 174   wxPoint pos(0, 0);
 175   wxSize  size(400, 200);
 176
 177   wxString strFile("Drop files here!"), strText("Drop text on me");
 178
 179   m_ctrlFile  = new wxListBox(this, -1, pos, size, 1, &strFile, wxLB_HSCROLL);
 180   m_ctrlText  = new wxListBox(this, -1, pos, size, 1, &strText, wxLB_HSCROLL);
 181
 182   m_ctrlLog   = new wxTextCtrl(this, -1, "", pos, size,
 183                                wxTE_MULTILINE | wxTE_READONLY |
 184                                wxSUNKEN_BORDER| wxHSCROLL);
 185
 186   // redirect log messages to the text window (don't forget to delete it!)
 187   m_pLog = new wxLogTextCtrl(m_ctrlLog);
 188   m_pLogPrev = wxLog::SetActiveTarget(m_pLog);
 189
 190   // associate drop targets with 2 text controls
 191   m_ctrlFile->SetDropTarget(new DnDFile(m_ctrlFile));
 192   m_ctrlText->SetDropTarget(new DnDText(m_ctrlText));
 193
 194   wxLayoutConstraints *c;
 195
 196   // Top-left listbox
 197   c = new wxLayoutConstraints;
 198   c->left.SameAs(this, wxLeft);
 199   c->top.SameAs(this, wxTop);
 200   c->right.PercentOf(this, wxRight, 50);
 201   c->height.PercentOf(this, wxHeight, 40);
 202   m_ctrlFile->SetConstraints(c);
 203
 204   // Top-right listbox
 205   c = new wxLayoutConstraints;
 206   c->left.SameAs    (m_ctrlFile, wxRight);
 207   c->top.SameAs     (this, wxTop);
 208   c->right.SameAs   (this, wxRight);
 209   c->height.PercentOf(this, wxHeight, 40);
 210   m_ctrlText->SetConstraints(c);
 211
 212   // Lower text control
 213   c = new wxLayoutConstraints;
 214   c->left.SameAs    (this, wxLeft);
 215   c->right.SameAs   (this, wxRight);
 216   c->height.PercentOf(this, wxHeight, 40);
 217   c->top.SameAs(m_ctrlText, wxBottom);
 218   m_ctrlLog->SetConstraints(c);
 219
 220   SetAutoLayout(TRUE);
 221 }
 222
 223 void DnDFrame::OnQuit(wxCommandEvent& /* event */)
 224 {
 225   Close(TRUE);
 226 }
 227
 228 void DnDFrame::OnPaint(wxPaintEvent& /*event*/)
 229 {
 230   int w = 0;
 231   int h = 0;
 232   GetClientSize( &w, &h );
 233
 234   wxPaintDC dc(this);
 235   dc.SetFont( wxFont( 24, wxDECORATIVE, wxNORMAL, wxNORMAL ) );
 236   dc.DrawText( "Drag text from here!", 20, h-20 );
 237 }
 238
 239 void DnDFrame::OnDrag(wxCommandEvent& /* event */)
 240 {
 241   wxString strText = wxGetTextFromUser
 242   (
 243     "After you enter text in this dialog, press any mouse\n"
 244     "button in the bottom (empty) part of the frame and \n"
 245     "drag it anywhere - you will be in fact dragging the\n"
 246     "text object containing this text",
 247     "Please enter some text", m_strText, this
 248   );
 249
 250   m_strText = strText;
 251 }
 252
 253 void DnDFrame::OnAbout(wxCommandEvent& /* event */)
 254 {
 255   wxMessageDialog dialog(this,
 256                          "Drag-&-Drop Demo\n"
 257                          "Please see \"Help|Help...\" for details\n"
 258                          "Copyright (c) 1998 Vadim Zeitlin",
 259                          "About wxDnD");
 260
 261   dialog.ShowModal();
 262 }
 263
 264 void DnDFrame::OnHelp(wxCommandEvent& /* event */)
 265 {
 266   wxMessageDialog dialog(this,
 267 "This small program demonstrates drag & drop support in wxWindows. The program window\n"
 268 "consists of 3 parts: the bottom pane is for debug messages, so that you can see what's\n"
 269 "going on inside. The top part is split into 2 listboxes, the left one accepts files\n"
 270 "and the right one accepts text.\n"
 271 "\n"
 272 "To test wxDropTarget: open wordpad (write.exe), select some text in it and drag it to\n"
 273 "the right listbox (you'll notice the usual visual feedback, i.e. the cursor will change).\n"
 274 "Also, try dragging some files (you can select several at once) from Windows Explorer (or \n"
 275 "File Manager) to the left pane. Hold down Ctrl/Shift keys when you drop text (doesn't \n"
 276 "work with files) and see what changes.\n"
 277 "\n"
 278 "To test wxDropSource: just press any mouse button on the empty zone of the window and drag\n"
 279 "it to wordpad or any other droptarget accepting text (and of course you can just drag it\n"
 280 "to the right pane). Due to a lot of trace messages, the cursor might take some time to \n"
 281 "change, don't release the mouse button until it does. You can change the string being\n"
 282 "dragged in in \"File|Test drag...\" dialog.\n"
 283 "\n"
 284 "\n"
 285 "Please send all questions/bug reports/suggestions &c to \n"
 286 "Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>",
 287                         "wxDnD Help");
 288
 289   dialog.ShowModal();
 290 }
 291
 292 void DnDFrame::OnLogClear(wxCommandEvent& /* event */ )
 293 {
 294   m_ctrlLog->Clear();
 295 }
 296
 297 bool DnDFrame::OnClose()
 298 {
 299   return TRUE;
 300 }
 301
 302 void DnDFrame::OnLeftDown(wxMouseEvent &WXUNUSED(event) )
 303 {
 304   if ( !m_strText.IsEmpty() ) {
 305     // start drag operation
 306
 307     wxTextDataObject data(m_strText);
 308     wxDropSource dragSource(data, this);
 309     const char *pc;
 310
 311     switch ( dragSource.DoDragDrop(TRUE) ) {
 312       case wxDragError:   pc = "Error!";    break;
 313       case wxDragNone:    pc = "Nothing";   break;
 314       case wxDragCopy:    pc = "Copied";    break;
 315       case wxDragMove:    pc = "Moved";     break;
 316       case wxDragCancel:  pc = "Cancelled"; break;
 317       default:                    pc = "Huh?";      break;
 318     }
 319
 320     SetStatusText(wxString("Drag result: ") + pc);
 321   }
 322 }
 323
 324 void DnDFrame::OnRightDown(wxMouseEvent &event )
 325 {
 326   wxMenu *menu = new wxMenu;
 327
 328   menu->Append(Menu_Drag, "&Test drag...");
 329   menu->Append(Menu_About, "&About");
 330   menu->Append(Menu_Quit, "E&xit");
 331
 332   PopupMenu( menu, event.GetX(), event.GetY() );
 333 }
 334
 335 DnDFrame::~DnDFrame()
 336 {
 337   if ( m_pLog != NULL ) {
 338     if ( wxLog::SetActiveTarget(m_pLogPrev) == m_pLog )
 339       delete m_pLog;
 340   }
 341 }
 342
 343 // ----------------------------------------------------------------------------
 344 // Notifications called by the base class
 345 // ----------------------------------------------------------------------------
 346 bool DnDText::OnDropText(long, long, const char *psz)
 347 {
 348   m_pOwner->Append(psz);
 349
 350   return TRUE;
 351 }
 352
 353 bool DnDFile::OnDropFiles(long, long, size_t nFiles,
 354                           const char * const aszFiles[])
 355 {
 356   wxString str;
 357   str.Printf("%d files dropped", nFiles);
 358   m_pOwner->Append(str);
 359   for ( size_t n = 0; n < nFiles; n++ ) {
 360     m_pOwner->Append(aszFiles[n]);
 361   }
 362
 363   return TRUE;
 364 }