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 two 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   SetBackgroundColour(* wxWHITE);
 146
 147   // frame icon and status bar
 148   SetIcon(wxICON(mondrian));
 149
 150 //  const int widths[] = { -1 };
 151   CreateStatusBar();
 152
 153   // construct menu
 154   wxMenu *file_menu = new wxMenu;
 155   file_menu->Append(Menu_Drag, "&Test drag...");
 156   file_menu->AppendSeparator();
 157   file_menu->Append(Menu_Quit, "E&xit");
 158
 159   wxMenu *log_menu = new wxMenu;
 160   log_menu->Append(Menu_Clear, "Clear");
 161
 162   wxMenu *help_menu = new wxMenu;
 163   help_menu->Append(Menu_Help, "&Help...");
 164   help_menu->AppendSeparator();
 165   help_menu->Append(Menu_About, "&About");
 166
 167   wxMenuBar *menu_bar = new wxMenuBar;
 168   menu_bar->Append(file_menu, "&File");
 169   menu_bar->Append(log_menu,  "&Log");
 170   menu_bar->Append(help_menu, "&Help");
 171
 172   SetMenuBar(menu_bar);
 173
 174   // make a panel with 3 subwindows
 175   wxPoint pos(0, 0);
 176   wxSize  size(400, 200);
 177
 178   wxString strFile("Drop files here!"), strText("Drop text on me");
 179
 180   m_ctrlFile  = new wxListBox(this, -1, pos, size, 1, &strFile, wxLB_HSCROLL);
 181   m_ctrlText  = new wxListBox(this, -1, pos, size, 1, &strText, wxLB_HSCROLL);
 182
 183   m_ctrlLog   = new wxTextCtrl(this, -1, "", pos, size,
 184                                wxTE_MULTILINE | wxTE_READONLY |
 185                                wxSUNKEN_BORDER| wxHSCROLL);
 186
 187   // redirect log messages to the text window (don't forget to delete it!)
 188   m_pLog = new wxLogTextCtrl(m_ctrlLog);
 189   m_pLogPrev = wxLog::SetActiveTarget(m_pLog);
 190
 191   // associate drop targets with 2 text controls
 192   m_ctrlFile->SetDropTarget(new DnDFile(m_ctrlFile));
 193   m_ctrlText->SetDropTarget(new DnDText(m_ctrlText));
 194
 195   wxLayoutConstraints *c;
 196
 197   // Top-left listbox
 198   c = new wxLayoutConstraints;
 199   c->left.SameAs(this, wxLeft);
 200   c->top.SameAs(this, wxTop);
 201   c->right.PercentOf(this, wxRight, 50);
 202   c->height.PercentOf(this, wxHeight, 40);
 203   m_ctrlFile->SetConstraints(c);
 204
 205   // Top-right listbox
 206   c = new wxLayoutConstraints;
 207   c->left.SameAs    (m_ctrlFile, wxRight);
 208   c->top.SameAs     (this, wxTop);
 209   c->right.SameAs   (this, wxRight);
 210   c->height.PercentOf(this, wxHeight, 40);
 211   m_ctrlText->SetConstraints(c);
 212
 213   // Lower text control
 214   c = new wxLayoutConstraints;
 215   c->left.SameAs    (this, wxLeft);
 216   c->right.SameAs   (this, wxRight);
 217   c->height.PercentOf(this, wxHeight, 40);
 218   c->top.SameAs(m_ctrlText, wxBottom);
 219   m_ctrlLog->SetConstraints(c);
 220
 221   SetAutoLayout(TRUE);
 222 }
 223
 224 void DnDFrame::OnQuit(wxCommandEvent& /* event */)
 225 {
 226   Close(TRUE);
 227 }
 228
 229 void DnDFrame::OnPaint(wxPaintEvent& /*event*/)
 230 {
 231   int w = 0;
 232   int h = 0;
 233   GetClientSize( &w, &h );
 234
 235   wxPaintDC dc(this);
 236   dc.SetFont( wxFont( 24, wxDECORATIVE, wxNORMAL, wxNORMAL ) );
 237   dc.DrawText( "Drag text from here!", 20, h-30 );
 238 }
 239
 240 void DnDFrame::OnDrag(wxCommandEvent& /* event */)
 241 {
 242   wxString strText = wxGetTextFromUser
 243   (
 244     "After you enter text in this dialog, press any mouse\n"
 245     "button in the bottom (empty) part of the frame and \n"
 246     "drag it anywhere - you will be in fact dragging the\n"
 247     "text object containing this text",
 248     "Please enter some text", m_strText, this
 249   );
 250
 251   m_strText = strText;
 252 }
 253
 254 void DnDFrame::OnAbout(wxCommandEvent& /* event */)
 255 {
 256   wxMessageDialog dialog(this,
 257                          "Drag-&-Drop Demo\n"
 258                          "Please see \"Help|Help...\" for details\n"
 259                          "Copyright (c) 1998 Vadim Zeitlin",
 260                          "About wxDnD");
 261
 262   dialog.ShowModal();
 263 }
 264
 265 void DnDFrame::OnHelp(wxCommandEvent& /* event */)
 266 {
 267   wxMessageDialog dialog(this,
 268 "This small program demonstrates drag & drop support in wxWindows. The program window\n"
 269 "consists of 3 parts: the bottom pane is for debug messages, so that you can see what's\n"
 270 "going on inside. The top part is split into 2 listboxes, the left one accepts files\n"
 271 "and the right one accepts text.\n"
 272 "\n"
 273 "To test wxDropTarget: open wordpad (write.exe), select some text in it and drag it to\n"
 274 "the right listbox (you'll notice the usual visual feedback, i.e. the cursor will change).\n"
 275 "Also, try dragging some files (you can select several at once) from Windows Explorer (or \n"
 276 "File Manager) to the left pane. Hold down Ctrl/Shift keys when you drop text (doesn't \n"
 277 "work with files) and see what changes.\n"
 278 "\n"
 279 "To test wxDropSource: just press any mouse button on the empty zone of the window and drag\n"
 280 "it to wordpad or any other droptarget accepting text (and of course you can just drag it\n"
 281 "to the right pane). Due to a lot of trace messages, the cursor might take some time to \n"
 282 "change, don't release the mouse button until it does. You can change the string being\n"
 283 "dragged in in \"File|Test drag...\" dialog.\n"
 284 "\n"
 285 "\n"
 286 "Please send all questions/bug reports/suggestions &c to \n"
 287 "Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>",
 288                         "wxDnD Help");
 289
 290   dialog.ShowModal();
 291 }
 292
 293 void DnDFrame::OnLogClear(wxCommandEvent& /* event */ )
 294 {
 295   m_ctrlLog->Clear();
 296 }
 297
 298 bool DnDFrame::OnClose()
 299 {
 300   return TRUE;
 301 }
 302
 303 void DnDFrame::OnLeftDown(wxMouseEvent &WXUNUSED(event) )
 304 {
 305   if ( !m_strText.IsEmpty() ) {
 306     // start drag operation
 307
 308     wxTextDataObject data(m_strText);
 309     wxDropSource dragSource(data, this);
 310     const char *pc;
 311
 312     switch ( dragSource.DoDragDrop(TRUE) ) {
 313       case wxDragError:   pc = "Error!";    break;
 314       case wxDragNone:    pc = "Nothing";   break;
 315       case wxDragCopy:    pc = "Copied";    break;
 316       case wxDragMove:    pc = "Moved";     break;
 317       case wxDragCancel:  pc = "Cancelled"; break;
 318       default:                    pc = "Huh?";      break;
 319     }
 320
 321     SetStatusText(wxString("Drag result: ") + pc);
 322   }
 323 }
 324
 325 void DnDFrame::OnRightDown(wxMouseEvent &event )
 326 {
 327   wxMenu *menu = new wxMenu;
 328
 329   menu->Append(Menu_Drag, "&Test drag...");
 330   menu->Append(Menu_About, "&About");
 331   menu->Append(Menu_Quit, "E&xit");
 332
 333   PopupMenu( menu, event.GetX(), event.GetY() );
 334 }
 335
 336 DnDFrame::~DnDFrame()
 337 {
 338   if ( m_pLog != NULL ) {
 339     if ( wxLog::SetActiveTarget(m_pLogPrev) == m_pLog )
 340       delete m_pLog;
 341   }
 342 }
 343
 344 // ----------------------------------------------------------------------------
 345 // Notifications called by the base class
 346 // ----------------------------------------------------------------------------
 347 bool DnDText::OnDropText(long, long, const char *psz)
 348 {
 349   m_pOwner->Append(psz);
 350
 351   return TRUE;
 352 }
 353
 354 bool DnDFile::OnDropFiles(long, long, size_t nFiles,
 355                           const char * const aszFiles[])
 356 {
 357   wxString str;
 358   str.Printf("%d files dropped", nFiles);
 359   m_pOwner->Append(str);
 360   for ( size_t n = 0; n < nFiles; n++ ) {
 361     m_pOwner->Append(aszFiles[n]);
 362   }
 363
 364   return TRUE;
 365 }