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   DECLARE_EVENT_TABLE()
  95
  96 private:
  97   wxListBox  *m_ctrlFile,
  98              *m_ctrlText;
  99   wxTextCtrl *m_ctrlLog;
 100
 101   wxLog *m_pLog, *m_pLogPrev;
 102
 103   wxString m_strText;
 104 };
 105
 106 // ----------------------------------------------------------------------------
 107 // IDs for the menu commands
 108 // ----------------------------------------------------------------------------
 109
 110 enum
 111 {
 112   Menu_Quit = 1,
 113   Menu_Drag,
 114   Menu_About = 101,
 115   Menu_Help,
 116   Menu_Clear,
 117 };
 118
 119 BEGIN_EVENT_TABLE(DnDFrame, wxFrame)
 120   EVT_MENU(Menu_Quit,  DnDFrame::OnQuit)
 121   EVT_MENU(Menu_About, DnDFrame::OnAbout)
 122   EVT_MENU(Menu_Drag,  DnDFrame::OnDrag)
 123   EVT_MENU(Menu_Help,  DnDFrame::OnHelp)
 124   EVT_MENU(Menu_Clear, DnDFrame::OnLogClear)
 125   EVT_LEFT_DOWN(       DnDFrame::OnLeftDown)
 126   EVT_RIGHT_DOWN(      DnDFrame::OnRightDown)
 127   EVT_PAINT(           DnDFrame::OnPaint)
 128 END_EVENT_TABLE()
 129
 130 // `Main program' equivalent, creating windows and returning main app frame
 131 bool DnDApp::OnInit()
 132 {
 133   // create the main frame window
 134   DnDFrame *frame = new DnDFrame((wxFrame  *) NULL, "Drag & Drop wxWindows App",
 135                                  50, 50, 450, 340);
 136
 137   // activate it
 138   frame->Show(TRUE);
 139
 140   SetTopWindow(frame);
 141
 142   return TRUE;
 143 }
 144
 145 DnDFrame::DnDFrame(wxFrame *frame, char *title, int x, int y, int w, int h)
 146         : wxFrame(frame, -1, title, wxPoint(x, y), wxSize(w, h)),
 147           m_strText("wxWindows drag & drop works :-)")
 148
 149 {
 150 //  SetBackgroundColour(* wxWHITE);
 151
 152   // frame icon and status bar
 153   SetIcon(wxICON(mondrian));
 154
 155 //  const int widths[] = { -1 };
 156   CreateStatusBar();
 157
 158   // construct menu
 159   wxMenu *file_menu = new wxMenu;
 160   file_menu->Append(Menu_Drag, "&Test drag...");
 161   file_menu->AppendSeparator();
 162   file_menu->Append(Menu_Quit, "E&xit");
 163
 164   wxMenu *log_menu = new wxMenu;
 165   log_menu->Append(Menu_Clear, "Clear");
 166
 167   wxMenu *help_menu = new wxMenu;
 168   help_menu->Append(Menu_Help, "&Help...");
 169   help_menu->AppendSeparator();
 170   help_menu->Append(Menu_About, "&About");
 171
 172   wxMenuBar *menu_bar = new wxMenuBar;
 173   menu_bar->Append(file_menu, "&File");
 174   menu_bar->Append(log_menu,  "&Log");
 175   menu_bar->Append(help_menu, "&Help");
 176
 177   SetMenuBar(menu_bar);
 178
 179   // make a panel with 3 subwindows
 180   wxPoint pos(0, 0);
 181   wxSize  size(400, 200);
 182
 183   wxString strFile("Drop files here!"), strText("Drop text on me");
 184
 185   m_ctrlFile  = new wxListBox(this, -1, pos, size, 1, &strFile, wxLB_HSCROLL);
 186   m_ctrlText  = new wxListBox(this, -1, pos, size, 1, &strText, wxLB_HSCROLL);
 187
 188   m_ctrlLog   = new wxTextCtrl(this, -1, "", pos, size,
 189                                wxTE_MULTILINE | wxTE_READONLY |
 190                                wxSUNKEN_BORDER );
 191
 192   // redirect log messages to the text window (don't forget to delete it!)
 193   m_pLog = new wxLogTextCtrl(m_ctrlLog);
 194   m_pLogPrev = wxLog::SetActiveTarget(m_pLog);
 195
 196   // associate drop targets with 2 text controls
 197   m_ctrlFile->SetDropTarget(new DnDFile(m_ctrlFile));
 198   m_ctrlText->SetDropTarget( new DnDText(m_ctrlText) );
 199
 200   wxLayoutConstraints *c;
 201
 202   // Top-left listbox
 203   c = new wxLayoutConstraints;
 204   c->left.SameAs(this, wxLeft);
 205   c->top.SameAs(this, wxTop);
 206   c->right.PercentOf(this, wxRight, 50);
 207   c->height.PercentOf(this, wxHeight, 40);
 208   m_ctrlFile->SetConstraints(c);
 209
 210   // Top-right listbox
 211   c = new wxLayoutConstraints;
 212   c->left.SameAs    (m_ctrlFile, wxRight);
 213   c->top.SameAs     (this, wxTop);
 214   c->right.SameAs   (this, wxRight);
 215   c->height.PercentOf(this, wxHeight, 40);
 216   m_ctrlText->SetConstraints(c);
 217
 218   // Lower text control
 219   c = new wxLayoutConstraints;
 220   c->left.SameAs    (this, wxLeft);
 221   c->right.SameAs   (this, wxRight);
 222   c->height.PercentOf(this, wxHeight, 40);
 223   c->top.SameAs(m_ctrlText, wxBottom);
 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::OnPaint(wxPaintEvent& /*event*/)
 235 {
 236   int w = 0;
 237   int h = 0;
 238   GetClientSize( &w, &h );
 239
 240   wxPaintDC dc(this);
 241   dc.SetFont( wxFont( 24, wxDECORATIVE, wxNORMAL, wxNORMAL, FALSE, "charter" ) );
 242   dc.DrawText( "Drag text from here!", 20, h-22 );
 243 }
 244
 245 void DnDFrame::OnDrag(wxCommandEvent& /* event */)
 246 {
 247   wxString strText = wxGetTextFromUser
 248   (
 249     "After you enter text in this dialog, press any mouse\n"
 250     "button in the bottom (empty) part of the frame and \n"
 251     "drag it anywhere - you will be in fact dragging the\n"
 252     "text object containing this text",
 253     "Please enter some text", m_strText, this
 254   );
 255
 256   m_strText = strText;
 257 }
 258
 259 void DnDFrame::OnAbout(wxCommandEvent& /* event */)
 260 {
 261   wxMessageDialog dialog(this,
 262                          "Drag-&-Drop Demo\n"
 263                          "Please see \"Help|Help...\" for details\n"
 264                          "Copyright (c) 1998 Vadim Zeitlin",
 265                          "About wxDnD");
 266
 267   dialog.ShowModal();
 268 }
 269
 270 void DnDFrame::OnHelp(wxCommandEvent& /* event */)
 271 {
 272   wxMessageDialog dialog(this,
 273 "This small program demonstrates drag & drop support in wxWindows. The program window\n"
 274 "consists of 3 parts: the bottom pane is for debug messages, so that you can see what's\n"
 275 "going on inside. The top part is split into 2 listboxes, the left one accepts files\n"
 276 "and the right one accepts text.\n"
 277 "\n"
 278 "To test wxDropTarget: open wordpad (write.exe), select some text in it and drag it to\n"
 279 "the right listbox (you'll notice the usual visual feedback, i.e. the cursor will change).\n"
 280 "Also, try dragging some files (you can select several at once) from Windows Explorer (or \n"
 281 "File Manager) to the left pane. Hold down Ctrl/Shift keys when you drop text (doesn't \n"
 282 "work with files) and see what changes.\n"
 283 "\n"
 284 "To test wxDropSource: just press any mouse button on the empty zone of the window and drag\n"
 285 "it to wordpad or any other droptarget accepting text (and of course you can just drag it\n"
 286 "to the right pane). Due to a lot of trace messages, the cursor might take some time to \n"
 287 "change, don't release the mouse button until it does. You can change the string being\n"
 288 "dragged in in \"File|Test drag...\" dialog.\n"
 289 "\n"
 290 "\n"
 291 "Please send all questions/bug reports/suggestions &c to \n"
 292 "Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>",
 293                         "wxDnD Help");
 294
 295   dialog.ShowModal();
 296 }
 297
 298 void DnDFrame::OnLogClear(wxCommandEvent& /* event */ )
 299 {
 300   m_ctrlLog->Clear();
 301 }
 302
 303 void DnDFrame::OnLeftDown(wxMouseEvent &WXUNUSED(event) )
 304 {
 305   if ( !m_strText.IsEmpty() )
 306   {
 307     // start drag operation
 308 #ifdef __WXMSW__
 309     wxTextDataObject textData(m_strText);
 310     wxDropSource dragSource( textData, this );
 311 #else
 312     wxDropSource dragSource( new wxTextDataObject (m_strText), this, wxIcon(mondrian_xpm) );
 313 #endif
 314     const char *pc;
 315
 316     switch ( dragSource.DoDragDrop(TRUE) )
 317     {
 318       case wxDragError:   pc = "Error!";    break;
 319       case wxDragNone:    pc = "Nothing";   break;
 320       case wxDragCopy:    pc = "Copied";    break;
 321       case wxDragMove:    pc = "Moved";     break;
 322       case wxDragCancel:  pc = "Cancelled"; break;
 323       default:                    pc = "Huh?";      break;
 324     }
 325
 326     SetStatusText(wxString("Drag result: ") + pc);
 327   }
 328 }
 329
 330 void DnDFrame::OnRightDown(wxMouseEvent &event )
 331 {
 332   wxMenu *menu = new wxMenu;
 333
 334   menu->Append(Menu_Drag, "&Test drag...");
 335   menu->Append(Menu_About, "&About");
 336   menu->Append(Menu_Quit, "E&xit");
 337
 338   PopupMenu( menu, event.GetX(), event.GetY() );
 339 }
 340
 341 DnDFrame::~DnDFrame()
 342 {
 343   if ( m_pLog != NULL ) {
 344     if ( wxLog::SetActiveTarget(m_pLogPrev) == m_pLog )
 345       delete m_pLog;
 346   }
 347 }
 348
 349 // ----------------------------------------------------------------------------
 350 // Notifications called by the base class
 351 // ----------------------------------------------------------------------------
 352 bool DnDText::OnDropText(long, long, const char *psz)
 353 {
 354   m_pOwner->Append(psz);
 355
 356   return TRUE;
 357 }
 358
 359 bool DnDFile::OnDropFiles(long, long, size_t nFiles,
 360                           const char * const aszFiles[])
 361 {
 362   wxString str;
 363   str.Printf("%d files dropped", nFiles);
 364   m_pOwner->Append(str);
 365   for ( size_t n = 0; n < nFiles; n++ ) {
 366     m_pOwner->Append(aszFiles[n]);
 367   }
 368
 369   return TRUE;
 370 }