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 OnMouseBtnDown(wxMouseEvent& event);
  86
  87   bool OnClose();
  88
  89   DECLARE_EVENT_TABLE()
  90
  91 private:
  92   wxListBox  *m_ctrlFile,
  93              *m_ctrlText;
  94   wxTextCtrl *m_ctrlLog;
  95
  96   wxLog *m_pLog, *m_pLogPrev;
  97
  98   wxString m_strText;
  99 };
 100
 101 // ----------------------------------------------------------------------------
 102 // IDs for the menu commands
 103 // ----------------------------------------------------------------------------
 104 enum
 105 {
 106   Menu_Quit = 1,
 107   Menu_Drag,
 108   Menu_About = 101,
 109   Menu_Help,
 110   Menu_Clear,
 111 };
 112
 113 BEGIN_EVENT_TABLE(DnDFrame, wxFrame)
 114   EVT_MENU(Menu_Quit,  DnDFrame::OnQuit)
 115   EVT_MENU(Menu_About, DnDFrame::OnAbout)
 116   EVT_MENU(Menu_Drag,  DnDFrame::OnDrag)
 117   EVT_MENU(Menu_Help,  DnDFrame::OnHelp)
 118   EVT_MENU(Menu_Clear, DnDFrame::OnLogClear)
 119
 120   EVT_LEFT_DOWN(OnMouseBtnDown)
 121   EVT_RIGHT_DOWN(OnMouseBtnDown)
 122   EVT_MIDDLE_DOWN(OnMouseBtnDown)
 123 END_EVENT_TABLE()
 124
 125 // `Main program' equivalent, creating windows and returning main app frame
 126 bool DnDApp::OnInit(void)
 127 {
 128   // create the main frame window
 129   DnDFrame *frame = new DnDFrame(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 #ifdef __WXMSW__
 147   // frame icon and status bar
 148   SetIcon(wxIcon("mondrian"));
 149 #else
 150   SetIcon(wxIcon(mondrian_xpm));
 151 #endif
 152
 153   const int widths[] = { -1 };
 154   CreateStatusBar();
 155
 156   // construct menu
 157   wxMenu *file_menu = new wxMenu;
 158   file_menu->Append(Menu_Drag, "&Test drag...");
 159   file_menu->AppendSeparator();
 160   file_menu->Append(Menu_Quit, "E&xit");
 161
 162   wxMenu *log_menu = new wxMenu;
 163   log_menu->Append(Menu_Clear, "Clear");
 164
 165   wxMenu *help_menu = new wxMenu;
 166   help_menu->Append(Menu_Help, "&Help...");
 167   help_menu->AppendSeparator();
 168   help_menu->Append(Menu_About, "&About");
 169
 170   wxMenuBar *menu_bar = new wxMenuBar;
 171   menu_bar->Append(file_menu, "&File");
 172   menu_bar->Append(log_menu,  "&Log");
 173   menu_bar->Append(help_menu, "&Help");
 174
 175   SetMenuBar(menu_bar);
 176
 177   // make a panel with 3 subwindows
 178   wxPoint pos(0, 0);
 179   wxSize  size(400, 200);
 180
 181   wxString strFile("Drop files here!"), strText("Drop text on me");
 182
 183   m_ctrlFile  = new wxListBox(this, -1, pos, size, 1, &strFile, wxLB_HSCROLL);
 184   m_ctrlText  = new wxListBox(this, -1, pos, size, 1, &strText, wxLB_HSCROLL);
 185
 186   m_ctrlLog   = new wxTextCtrl(this, -1, "", pos, size,
 187                                wxTE_MULTILINE | wxTE_READONLY |
 188                                wxSUNKEN_BORDER| wxHSCROLL);
 189
 190   // redirect log messages to the text window (don't forget to delete it!)
 191   m_pLog = new wxLogTextCtrl(m_ctrlLog);
 192   m_pLogPrev = wxLog::SetActiveTarget(m_pLog);
 193
 194   // associate drop targets with 2 text controls
 195 //  m_ctrlFile->SetDropTarget(new DnDFile(m_ctrlFile));
 196   m_ctrlText->SetDropTarget(new DnDText(m_ctrlText));
 197
 198  wxLayoutConstraints *c;
 199
 200   // Top-left listbox
 201   c = new wxLayoutConstraints;
 202   c->left.SameAs                (this, wxLeft);
 203   c->top.SameAs                 (this, wxTop);
 204   c->right.PercentOf(this, wxRight, 50);
 205   c->height.PercentOf(this, wxHeight, 40);
 206   m_ctrlFile->SetConstraints(c);
 207
 208   // Top-right listbox
 209   c = new wxLayoutConstraints;
 210   c->left.SameAs    (m_ctrlFile, wxRight);
 211   c->top.SameAs     (this, wxTop);
 212   c->right.SameAs   (this, wxRight);
 213   c->height.PercentOf(this, wxHeight, 40);
 214   m_ctrlText->SetConstraints(c);
 215
 216   // Lower text control
 217   c = new wxLayoutConstraints;
 218   c->left.SameAs    (this, wxLeft);
 219   c->right.SameAs   (this, wxRight);
 220   c->height.PercentOf(this, wxHeight, 40);
 221   c->top.SameAs(m_ctrlText, wxBottom);
 222
 223   m_ctrlLog->SetConstraints(c);
 224
 225   SetAutoLayout(TRUE);
 226 }
 227
 228 void DnDFrame::OnQuit(wxCommandEvent& /* event */)
 229 {
 230   Close(TRUE);
 231 }
 232
 233 void DnDFrame::OnDrag(wxCommandEvent& /* event */)
 234 {
 235   wxString strText = wxGetTextFromUser
 236   (
 237     "After you enter text in this dialog, press any mouse\n"
 238     "button in the bottom (empty) part of the frame and \n"
 239     "drag it anywhere - you will be in fact dragging the\n"
 240     "text object containing this text",
 241     "Please enter some text", m_strText, this
 242   );
 243
 244   m_strText = strText;
 245 }
 246
 247 void DnDFrame::OnAbout(wxCommandEvent& /* event */)
 248 {
 249   wxMessageDialog dialog(this,
 250                          "Drag-&-Drop Demo\n"
 251                          "Please see \"Help|Help...\" for details\n"
 252                          "Copyright (c) 1998 Vadim Zeitlin",
 253                          "About wxDnD");
 254
 255   dialog.ShowModal();
 256 }
 257
 258 void DnDFrame::OnHelp(wxCommandEvent& /* event */)
 259 {
 260   wxMessageDialog dialog(this,
 261 "This small program demonstrates drag & drop support in wxWindows. "
 262 "The program window consists of 3 parts: the bottom pane is for "
 263 "debug messages, so that you can see what's going on inside. "
 264 "The top part is split into 2 listboxes, the left one accepts "
 265 "files and the right one accepts text."
 266 "\n\n"
 267 "To test wxDropTarget: open wordpad (write.exe), select some text in "
 268 "it and drag it to the right listbox (you'll notice the usual visual "
 269 "feedback, i.e. the cursor will change). Also, try dragging some "
 270 "files (you can select several at once) from Windows Explorer (or "
 271 "File Manager) to the left pane. Hold down Ctrl/Shift keys when "
 272 "you drop text (doesn't work with files) and see what changes. "
 273 "\n\n"
 274 "To test wxDropSource: just press any mouse button on the empty zone of "
 275 "the window and drag it to wordpad or any other droptarget accepting "
 276 "text (and of course you can just drag it to the right pane). Due to "
 277 "a lot of trace messages, the cursor might take some time to change, "
 278 "don't release the mouse button until it does. You can change the "
 279 "string being dragged in in \"File|Test drag...\" dialog."
 280 "\n\n"
 281 "Please send all questions/bug reports/suggestions &c to "
 282 "Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>",
 283                         "wxDnD Help");
 284
 285   dialog.ShowModal();
 286 }
 287
 288 void DnDFrame::OnLogClear(wxCommandEvent& /* event */ )
 289 {
 290   m_ctrlLog->Clear();
 291 }
 292
 293 bool DnDFrame::OnClose()
 294 {
 295   return TRUE;
 296 }
 297
 298 void DnDFrame::OnMouseBtnDown(wxMouseEvent& /* event */ )
 299 {
 300   if ( !m_strText.IsEmpty() ) {
 301     // start drag operation
 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 DnDFrame::~DnDFrame()
 320 {
 321   if ( m_pLog != NULL ) {
 322     if ( wxLog::SetActiveTarget(m_pLogPrev) == m_pLog )
 323       delete m_pLog;
 324   }
 325 }
 326
 327 // ----------------------------------------------------------------------------
 328 // Notifications called by the base class
 329 // ----------------------------------------------------------------------------
 330 bool DnDText::OnDropText(long, long, const char *psz)
 331 {
 332   m_pOwner->Append(psz);
 333
 334   return TRUE;
 335 }
 336
 337 bool DnDFile::OnDropFiles(long, long, size_t nFiles,
 338                           const char * const aszFiles[])
 339 {
 340   wxString str;
 341   str.Printf("%d files dropped", nFiles);
 342   m_pOwner->Append(str);
 343   for ( size_t n = 0; n < nFiles; n++ ) {
 344     m_pOwner->Append(aszFiles[n]);
 345   }
 346
 347   return TRUE;
 348 }