samples/vscroll/vstest.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        samples/vscroll/vstest.cpp
   3 // Purpose:     VScroll wxWidgets sample
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     04/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 2003 Vadim Zeitlin <vadim@wxwidgets.org>
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 // For compilers that support precompilation, includes "wx/wx.h".
  21 #include "wx/wxprec.h"
  22
  23 #ifdef __BORLANDC__
  24     #pragma hdrstop
  25 #endif
  26
  27 // for all others, include the necessary headers (this file is usually all you
  28 // need because it includes almost all "standard" wxWidgets headers)
  29 #ifndef WX_PRECOMP
  30     #include "wx/wx.h"
  31     #include "wx/app.h"
  32     #include "wx/frame.h"
  33 #endif
  34
  35 // we need to include the headers not included from wx/wx.h explicitly anyhow
  36 #include "wx/vscroll.h"
  37
  38 // ----------------------------------------------------------------------------
  39 // resources
  40 // ----------------------------------------------------------------------------
  41
  42 // the application icon (under Windows and OS/2 it is in resources)
  43 #if !defined(__WXMSW__) && !defined(__WXPM__)
  44     #include "../sample.xpm"
  45 #endif
  46
  47 // ----------------------------------------------------------------------------
  48 // private classes
  49 // ----------------------------------------------------------------------------
  50
  51 // Define a new application type, each program should derive a class from wxApp
  52 class VScrollApp : public wxApp
  53 {
  54 public:
  55     // create our main window
  56     virtual bool OnInit();
  57 };
  58
  59 // Define a new frame type: this is going to be our main frame
  60 class VScrollFrame : public wxFrame
  61 {
  62 public:
  63     // ctor
  64     VScrollFrame();
  65
  66     // event handlers (these functions should _not_ be virtual)
  67     void OnQuit(wxCommandEvent& event);
  68     void OnAbout(wxCommandEvent& event);
  69
  70     void OnSize(wxSizeEvent& event)
  71     {
  72         // show current size in the status bar
  73 #if wxUSE_STATUSBAR
  74         if ( m_frameStatusBar )
  75         {
  76             wxSize sz = GetClientSize();
  77             SetStatusText(wxString::Format(_T("%dx%d"), sz.x, sz.y), 1);
  78         }
  79 #endif // wxUSE_STATUSBAR
  80
  81         event.Skip();
  82     }
  83
  84 private:
  85     // any class wishing to process wxWidgets events must use this macro
  86     DECLARE_EVENT_TABLE()
  87 };
  88
  89 class VScrollWindow : public wxVScrolledWindow
  90 {
  91 public:
  92     VScrollWindow(wxFrame *frame) : wxVScrolledWindow(frame, wxID_ANY)
  93     {
  94         m_frame = frame;
  95
  96         SetLineCount(200);
  97
  98         m_changed = true;
  99     }
 100
 101     void OnIdle(wxIdleEvent&)
 102     {
 103 #if wxUSE_STATUSBAR
 104         m_frame->SetStatusText(wxString::Format
 105                                (
 106                                     _T("Page size = %d, pos = %d, max = %d"),
 107                                     GetScrollThumb(wxVERTICAL),
 108                                     GetScrollPos(wxVERTICAL),
 109                                     GetScrollRange(wxVERTICAL)
 110                                ));
 111 #endif // wxUSE_STATUSBAR
 112         m_changed = false;
 113     }
 114
 115     void OnPaint(wxPaintEvent&)
 116     {
 117         wxPaintDC dc(this);
 118
 119         dc.SetPen(*wxBLACK_DASHED_PEN);
 120
 121         const size_t lineFirst = GetFirstVisibleLine(),
 122                      lineLast = GetLastVisibleLine();
 123
 124         const wxCoord hText = dc.GetCharHeight();
 125
 126         wxCoord y = 0;
 127         for ( size_t line = lineFirst; line <= lineLast; line++ )
 128         {
 129             dc.DrawLine(0, y, 1000, y);
 130
 131             wxCoord hLine = OnGetLineHeight(line);
 132             dc.DrawText(wxString::Format(_T("Line %lu"), (unsigned long)line),
 133                         0, y + (hLine - hText) / 2);
 134
 135             y += hLine;
 136             dc.DrawLine(0, y, 1000, y);
 137         }
 138     }
 139
 140     void OnScroll(wxScrollWinEvent& event)
 141     {
 142         m_changed = true;
 143
 144         event.Skip();
 145     }
 146
 147
 148     virtual wxCoord OnGetLineHeight(size_t n) const
 149     {
 150         wxASSERT( n < GetLineCount() );
 151
 152         return n % 2 ? 15 : 30; // 15 + 2*n
 153     }
 154
 155 private:
 156     wxFrame *m_frame;
 157
 158     bool m_changed;
 159
 160     DECLARE_EVENT_TABLE()
 161 };
 162
 163 BEGIN_EVENT_TABLE(VScrollWindow, wxVScrolledWindow)
 164     EVT_IDLE(VScrollWindow::OnIdle)
 165     EVT_PAINT(VScrollWindow::OnPaint)
 166     EVT_SCROLLWIN(VScrollWindow::OnScroll)
 167 END_EVENT_TABLE()
 168
 169 // ----------------------------------------------------------------------------
 170 // constants
 171 // ----------------------------------------------------------------------------
 172
 173 // IDs for the controls and the menu commands
 174 enum
 175 {
 176     // menu items
 177     VScroll_Quit = wxID_EXIT,
 178
 179     // it is important for the id corresponding to the "About" command to have
 180     // this standard value as otherwise it won't be handled properly under Mac
 181     // (where it is special and put into the "Apple" menu)
 182     VScroll_About = wxID_ABOUT
 183 };
 184
 185 // ----------------------------------------------------------------------------
 186 // event tables and other macros for wxWidgets
 187 // ----------------------------------------------------------------------------
 188
 189 // the event tables connect the wxWidgets events with the functions (event
 190 // handlers) which process them. It can be also done at run-time, but for the
 191 // simple menu events like this the static method is much simpler.
 192 BEGIN_EVENT_TABLE(VScrollFrame, wxFrame)
 193     EVT_MENU(VScroll_Quit,  VScrollFrame::OnQuit)
 194     EVT_MENU(VScroll_About, VScrollFrame::OnAbout)
 195     EVT_SIZE(VScrollFrame::OnSize)
 196 END_EVENT_TABLE()
 197
 198 // Create a new application object: this macro will allow wxWidgets to create
 199 // the application object during program execution (it's better than using a
 200 // static object for many reasons) and also declares the accessor function
 201 // wxGetApp() which will return the reference of the right type (i.e. VScrollApp and
 202 // not wxApp)
 203 IMPLEMENT_APP(VScrollApp)
 204
 205 // ============================================================================
 206 // implementation
 207 // ============================================================================
 208
 209 // ----------------------------------------------------------------------------
 210 // the application class
 211 // ----------------------------------------------------------------------------
 212
 213 // 'Main program' equivalent: the program execution "starts" here
 214 bool VScrollApp::OnInit()
 215 {
 216     // create the main application window
 217     VScrollFrame *frame = new VScrollFrame;
 218
 219     // and show it (the frames, unlike simple controls, are not shown when
 220     // created initially)
 221     frame->Show(true);
 222
 223     // ok
 224     return true;
 225 }
 226
 227 // ----------------------------------------------------------------------------
 228 // main frame
 229 // ----------------------------------------------------------------------------
 230
 231 // frame constructor
 232 VScrollFrame::VScrollFrame()
 233             : wxFrame(NULL,
 234                       wxID_ANY,
 235                       _T("VScroll wxWidgets Sample"),
 236                       wxDefaultPosition,
 237                       wxSize(400, 350))
 238 {
 239     // set the frame icon
 240     SetIcon(wxICON(sample));
 241
 242 #if wxUSE_MENUS
 243     // create a menu bar
 244     wxMenu *menuFile = new wxMenu;
 245
 246     // the "About" item should be in the help menu
 247     wxMenu *menuHelp = new wxMenu;
 248     menuHelp->Append(VScroll_About, _T("&About...\tF1"), _T("Show about dialog"));
 249
 250     menuFile->Append(VScroll_Quit, _T("E&xit\tAlt-X"), _T("Quit this program"));
 251
 252     // now append the freshly created menu to the menu bar...
 253     wxMenuBar *menuBar = new wxMenuBar;
 254     menuBar->Append(menuFile, _T("&File"));
 255     menuBar->Append(menuHelp, _T("&Help"));
 256
 257     // ... and attach this menu bar to the frame
 258     SetMenuBar(menuBar);
 259 #endif // wxUSE_MENUS
 260
 261 #if wxUSE_STATUSBAR
 262     // create a status bar just for fun (by default with 1 pane only)
 263     CreateStatusBar(2);
 264     SetStatusText(_T("Welcome to wxWidgets!"));
 265 #endif // wxUSE_STATUSBAR
 266
 267     // create our one and only child -- it will take our entire client area
 268     new VScrollWindow(this);
 269 }
 270
 271 // ----------------------------------------------------------------------------
 272 // event handlers
 273 // ----------------------------------------------------------------------------
 274
 275 void VScrollFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
 276 {
 277     // true is to force the frame to close
 278     Close(true);
 279 }
 280
 281 void VScrollFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
 282 {
 283     wxMessageBox(_T("VScroll shows how to implement scrolling with\n")
 284                  _T("variable line heights.\n")
 285                  _T("(c) 2003 Vadim Zeitlin"),
 286                  _T("About VScroll"),
 287                  wxOK | wxICON_INFORMATION,
 288                  this);
 289 }