samples/xrc/objrefdlg.cpp

   1 //-----------------------------------------------------------------------------
   2 // Name:        objref.cpp
   3 // Purpose:     XML resources sample: Object references and ID ranges dialog
   4 // Author:      David Hart, Vaclav Slavik
   5 // RCS-ID:      $Id$
   6 // Copyright:   (c) Vaclav Slavik
   7 // Licence:     wxWindows licence
   8 //-----------------------------------------------------------------------------
   9
  10 //-----------------------------------------------------------------------------
  11 // Standard wxWidgets headers
  12 //-----------------------------------------------------------------------------
  13
  14 // For compilers that support precompilation, includes "wx/wx.h".
  15 #include "wx/wxprec.h"
  16
  17 #ifdef __BORLANDC__
  18     #pragma hdrstop
  19 #endif
  20
  21 // For all others, include the necessary headers (this file is usually all you
  22 // need because it includes almost all "standard" wxWidgets headers)
  23 #ifndef WX_PRECOMP
  24     #include "wx/wx.h"
  25 #endif
  26
  27 //-----------------------------------------------------------------------------
  28 // Header of this .cpp file
  29 //-----------------------------------------------------------------------------
  30
  31 #include "objrefdlg.h"
  32
  33 //-----------------------------------------------------------------------------
  34 // Remaining headers: Needed wx headers, then wx/contrib headers, then application headers
  35 //-----------------------------------------------------------------------------
  36
  37 #include "wx/xrc/xmlres.h"              // XRC XML resouces
  38
  39
  40
  41 //-----------------------------------------------------------------------------
  42 // Public members
  43 //-----------------------------------------------------------------------------
  44 ObjrefDialog::ObjrefDialog(wxWindow* parent)
  45 {
  46     wxXmlResource::Get()->LoadDialog(this, parent, wxT("objref_dialog"));
  47
  48     nb = XRCCTRL(*this, "objref_notebook", wxNotebook);
  49     wxCHECK_RET(nb, "failed to find objref_notebook");
  50
  51     // Connect different event handlers.
  52     nb->Connect(wxEVT_COMMAND_NOTEBOOK_PAGE_CHANGED,
  53                 wxNotebookEventHandler(ObjrefDialog::OnNotebookPageChanged),
  54                 NULL, this);
  55
  56     // We want to direct UpdateUI events for the ID range 'first_row' to
  57     // OnUpdateUIFirst(). We could achieve this using first_row[0] and
  58     // first_row[2], but what if a fourth column were added? It's safer to use
  59     // the 'typedefs' for the two ends of the range:
  60     wxNotebookPage *page = nb->GetPage(icons_page);
  61     page->Connect(XRCID("first_row[start]"), XRCID("first_row[end]"),
  62                   wxEVT_UPDATE_UI,
  63                   wxUpdateUIEventHandler(ObjrefDialog::OnUpdateUIFirst),
  64                   NULL, this);
  65     page->Connect(XRCID("second_row[start]"), XRCID("second_row[end]"),
  66                   wxEVT_UPDATE_UI,
  67                   wxUpdateUIEventHandler(ObjrefDialog::OnUpdateUISecond),
  68                   NULL, this);
  69     page->Connect(XRCID("third_row[start]"), XRCID("third_row[end]"),
  70                   wxEVT_UPDATE_UI,
  71                   wxUpdateUIEventHandler(ObjrefDialog::OnUpdateUIThird),
  72                   NULL, this);
  73
  74     // Connect the id ranges, using the [start] and [end] 'typedefs'
  75     page = nb->GetPage(calc_page);
  76     page->Connect(XRCID("digits[start]"), XRCID("digits[end]"),
  77                   wxEVT_COMMAND_BUTTON_CLICKED,
  78                   wxCommandEventHandler(ObjrefDialog::OnNumeralClick),
  79                   NULL, this);
  80     page->Connect(XRCID("operators[start]"), XRCID("operators[end]"),
  81                   wxEVT_COMMAND_BUTTON_CLICKED,
  82                   wxCommandEventHandler(ObjrefDialog::OnOperatorClick),
  83                   NULL, this);
  84
  85 }
  86
  87 ObjrefDialog::~ObjrefDialog()
  88 {
  89     // Select page 0. Otherwise if the Calc page were selected, when it's removed the Icons page is selected
  90     // and sets the log target again in idle time, *after* myframe restores the old one!
  91     nb->ChangeSelection(0);
  92 }
  93
  94 //-----------------------------------------------------------------------------
  95 // Private members (including the event handlers)
  96 //-----------------------------------------------------------------------------
  97 void ObjrefDialog::OnNotebookPageChanged( wxNotebookEvent &event )
  98 {
  99     switch(event.GetSelection())
 100     {
 101         case copy_page:
 102             {
 103                 // This is a straight object reference to the first page
 104                 // so change the text programmatically
 105                 nb->SetPageText(copy_page, "Page 1 copy");
 106
 107                 wxNotebookPage *page = nb->GetPage(copy_page);
 108                 wxTextCtrl *text = XRCCTRL(*page, "description_text", wxTextCtrl);
 109                 text->ChangeValue(
 110                     wxString("This is a duplicate of page 1, using an object reference. ")
 111                     + wxString("It was created by this very simple xml:\n\n")
 112                     + wxString("<object class=\"notebookpage\">\n\t<object_ref ref=\"page1\"/>\n")
 113                     + wxString("\t<label>Page 1 copy</label>\n</object>")
 114                     + wxString("\n\n(Then I'm cheating by inserting this text programmatically.)")
 115                                 );
 116                 break;
 117             }
 118
 119         case icons_page:
 120             {
 121                 wxNotebookPage *page = nb->GetPage(icons_page);
 122                 text = XRCCTRL(*page, "log_text", wxTextCtrl);
 123                 if (text)
 124                     delete wxLog::SetActiveTarget(new wxLogTextCtrl(text));
 125                 break;
 126             }
 127
 128         case calc_page:
 129             {
 130                 wxNotebookPage *page = nb->GetPage(calc_page);
 131                 result_txt = XRCCTRL(*page, "result", wxTextCtrl);
 132                 text = XRCCTRL(*page, "log_text", wxTextCtrl);
 133                 if (text)
 134                     delete wxLog::SetActiveTarget(new wxLogTextCtrl(text));
 135
 136                 ClearCalculator();
 137                 break;
 138             }
 139
 140          default: return;
 141     }
 142 }
 143
 144 // There are undoubtedly simpler ways of doing all this, but we're demonstrating the use of ID ranges
 145 void ObjrefDialog::OnUpdateUIFirst(wxUpdateUIEvent& event)
 146 {
 147     // The checkbox with the XRCID 'check[0]' controls this row of icons
 148     wxCheckBox *chk = XRCCTRL(*(nb->GetPage(icons_page)), "check[0]", wxCheckBox);
 149     if (chk)
 150         event.Enable(chk->IsChecked());
 151
 152     // Let's create a log-window entry
 153     static bool checked = true;
 154     if (chk->IsChecked() != checked)
 155     {
 156         checked = chk->IsChecked();
 157         wxLogMessage("Row one has been %s by check[0], XRCID = %i", checked ? "enabled" : "disabled", XRCID("check[0]"));
 158         wxLogMessage("XRCIDs: first_row[start] = %i, first_row[0] = %i, first_row[1] = %i, first_row[2] = %i, first_row[end] = %i",
 159             XRCID("first_row[start]"), XRCID("first_row[0]"), XRCID("first_row[1]"), XRCID("first_row[2]"), XRCID("first_row[end]"));
 160     }
 161 }
 162
 163 void ObjrefDialog::OnUpdateUISecond(wxUpdateUIEvent& event)
 164 {
 165     // The checkbox with the XRCID 'check[1]' controls this row of icons
 166     wxCheckBox *chk = XRCCTRL(*(nb->GetPage(icons_page)), "check[1]", wxCheckBox);
 167     if (chk)
 168         event.Enable(chk->IsChecked());
 169
 170     // Let's create a log-window entry
 171     static bool checked = true;
 172     if (chk->IsChecked() != checked)
 173     {
 174         checked = chk->IsChecked();
 175         wxLogMessage("Row two has been %s by check[1], XRCID = %i", checked ? "enabled" : "disabled", XRCID("check[1]"));
 176         wxLogMessage("XRCIDs: second_row[start] = %i, second_row[0] = %i, second_row[1] = %i, second_row[2] = %i, second_row[end] = %i",
 177             XRCID("second_row[start]"), XRCID("second_row[0]"), XRCID("second_row[1]"), XRCID("second_row[2]"), XRCID("second_row[end]"));
 178     }
 179 }
 180
 181 void ObjrefDialog::OnUpdateUIThird(wxUpdateUIEvent& event)
 182 {
 183     // The checkbox with the XRCID 'check[2]' controls this row of icons
 184     wxCheckBox *chk = XRCCTRL(*(nb->GetPage(icons_page)), "check[2]", wxCheckBox);
 185     if (chk)
 186         event.Enable(chk->IsChecked());
 187
 188     // Let's create a log-window entry
 189     static bool checked = true;
 190     if (chk->IsChecked() != checked)
 191     {
 192         checked = chk->IsChecked();
 193         wxLogMessage("Row three has been %s by check[2], XRCID = %i", checked ? "enabled" : "disabled", XRCID("check[2]"));
 194         wxLogMessage("XRCIDs: third_row[start] = %i, third_row[0] = %i, third_row[1] = %i, third_row[2] = %i, third_row[end] = %i",
 195             XRCID("third_row[start]"), XRCID("third_row[0]"), XRCID("third_row[1]"), XRCID("third_row[2]"), XRCID("third_row[end]"));
 196     }
 197 }
 198
 199 void ObjrefDialog::OnNumeralClick(wxCommandEvent& event)
 200 {
 201     // See how the id range simplifies determining which numeral was clicked
 202     int digit = event.GetId() - XRCID("digits[start]");
 203
 204     char c = '0' + digit;
 205     if (current==0 && previous==0)
 206     {
 207         // We're just starting a calculation, so get rid of the placeholder '0'
 208         result_txt->Clear();
 209     }
 210     else if (operator_expected == true)
 211     {
 212         // If we've just finished one calculation, and now a digit is entered, clear
 213         ClearCalculator();
 214         result_txt->Clear();
 215     }
 216     (*result_txt) << c;
 217
 218
 219     current = current*10 + digit;
 220
 221     wxLogMessage("You clicked digits[%c], XRCID %i", c, event.GetId());
 222 }
 223
 224 void ObjrefDialog::OnOperatorClick(wxCommandEvent& event)
 225 {
 226     static const char symbols[] = "+-*/=";
 227
 228     operator_expected = false;
 229     int ID = event.GetId() - XRCID("operators[start]");
 230
 231     // We carefully used "operators[end]" as the name of the Clear button
 232     if (event.GetId() == XRCID("operators[end]"))
 233     {
 234         wxLogMessage("You clicked operators[%i], XRCID %i, 'Clear'", ID, event.GetId());
 235         return ClearCalculator();
 236     }
 237
 238     switch(ID)
 239     {
 240         case operator_plus:
 241         case operator_minus:
 242         case operator_multiply:
 243         case operator_divide:
 244             if (current!=0 || previous!=0)
 245             {
 246                 // We're in the middle of a complex calculation, so do the first bit
 247                 Calculate();
 248             }
 249             curr_operator = (CalcOperator)ID;
 250             break;
 251
 252         case operator_equals:
 253             Calculate();
 254             wxLogMessage("You clicked operators[%i], XRCID %i, giving a '%c'", ID, event.GetId(), symbols[ID]);
 255             curr_operator = operator_equals;
 256             // Flag that the next entry should be an operator, not a digit
 257             operator_expected = true;
 258             return;
 259     }
 260
 261     (*result_txt) << ' ' << symbols[ID] << ' ';
 262
 263     wxLogMessage("You clicked operators[%i], XRCID %i, giving a '%c'", ID, event.GetId(), symbols[ID]);
 264 }
 265
 266 void ObjrefDialog::Calculate()
 267 {
 268     switch(curr_operator)
 269     {
 270         case operator_plus:
 271             previous += current; break;
 272         case operator_minus:
 273             previous -= current; break;
 274         case operator_multiply:
 275             previous *= current; break;
 276         case operator_divide:
 277             if (current!=0)
 278                 previous /= current;
 279             break;
 280          default: return;
 281     }
 282
 283     curr_operator = operator_plus;
 284     current = 0;
 285     result_txt->Clear();
 286
 287     (*result_txt) << previous;
 288 }
 289
 290 void ObjrefDialog::ClearCalculator()
 291 {
 292     current = previous = 0;
 293     curr_operator = operator_plus;
 294     operator_expected = false;
 295     result_txt->ChangeValue("0");
 296 }