src/univ/button.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        univ/button.cpp
   3 // Purpose:     wxButton
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     14.08.00
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 2000 SciTech Software, Inc. (www.scitechsoft.com)
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 #ifdef __GNUG__
  21     #pragma implementation "univbutton.h"
  22 #endif
  23
  24 #include "wx/wxprec.h"
  25
  26 #ifdef __BORLANDC__
  27     #pragma hdrstop
  28 #endif
  29
  30 #if wxUSE_BUTTON
  31
  32 #ifndef WX_PRECOMP
  33     #include "wx/dcclient.h"
  34     #include "wx/dcscreen.h"
  35     #include "wx/button.h"
  36     #include "wx/validate.h"
  37 #endif
  38
  39 #include "wx/univ/renderer.h"
  40 #include "wx/univ/inphand.h"
  41 #include "wx/univ/theme.h"
  42
  43 // ----------------------------------------------------------------------------
  44 // constants
  45 // ----------------------------------------------------------------------------
  46
  47 // default margins around the image
  48 static const wxCoord DEFAULT_BTN_MARGIN_X = 0;
  49 static const wxCoord DEFAULT_BTN_MARGIN_Y = 0;
  50
  51 // ============================================================================
  52 // implementation
  53 // ============================================================================
  54
  55 IMPLEMENT_DYNAMIC_CLASS(wxButton, wxControl)
  56
  57 // ----------------------------------------------------------------------------
  58 // creation
  59 // ----------------------------------------------------------------------------
  60
  61 void wxButton::Init()
  62 {
  63     m_isPressed =
  64     m_isDefault = FALSE;
  65 }
  66
  67 bool wxButton::Create(wxWindow *parent,
  68                       wxWindowID id,
  69                       const wxBitmap& bitmap,
  70                       const wxString &label,
  71                       const wxPoint &pos,
  72                       const wxSize &size,
  73                       long style,
  74                       const wxValidator& validator,
  75                       const wxString &name)
  76 {
  77     // center label by default
  78     if ( !(style & wxALIGN_MASK) )
  79     {
  80         style |= wxALIGN_CENTRE_HORIZONTAL | wxALIGN_CENTRE_VERTICAL;
  81     }
  82
  83     if ( !wxControl::Create(parent, id, pos, size, style, wxDefaultValidator, name) )
  84         return FALSE;
  85
  86     SetLabel(label);
  87     SetImageLabel(bitmap);
  88     // SetBestSize(size); -- called by SetImageLabel()
  89
  90     CreateInputHandler(wxINP_HANDLER_BUTTON);
  91
  92     return TRUE;
  93 }
  94
  95 wxButton::~wxButton()
  96 {
  97 }
  98
  99 // ----------------------------------------------------------------------------
 100 // size management
 101 // ----------------------------------------------------------------------------
 102
 103 /* static */
 104 wxSize wxButtonBase::GetDefaultSize()
 105 {
 106     static wxSize s_sizeBtn;
 107
 108     if ( s_sizeBtn.x == 0 )
 109     {
 110         wxScreenDC dc;
 111
 112         // this corresponds more or less to wxMSW standard in Win32 theme (see
 113         // wxWin32Renderer::AdjustSize())
 114         s_sizeBtn.x = 8*dc.GetCharWidth();
 115         s_sizeBtn.y = (11*dc.GetCharHeight())/10 + 2;
 116     }
 117
 118     return s_sizeBtn;
 119 }
 120
 121 wxSize wxButton::DoGetBestClientSize() const
 122 {
 123     wxClientDC dc(wxConstCast(this, wxButton));
 124     wxCoord width, height;
 125     dc.GetMultiLineTextExtent(GetLabel(), &width, &height);
 126
 127     if ( m_bitmap.Ok() )
 128     {
 129         // allocate extra space for the bitmap
 130         wxCoord heightBmp = m_bitmap.GetHeight() + 2*m_marginBmpY;
 131         if ( height < heightBmp )
 132             height = heightBmp;
 133
 134         width += m_bitmap.GetWidth() + 2*m_marginBmpX;
 135     }
 136
 137     // for compatibility with other ports, the buttons default size is never
 138     // less than the standard one
 139     wxSize szDef = GetDefaultSize();
 140     if ( width < szDef.x )
 141         width = szDef.x;
 142
 143     return wxSize(width, height);
 144 }
 145
 146 // ----------------------------------------------------------------------------
 147 // drawing
 148 // ----------------------------------------------------------------------------
 149
 150 void wxButton::DoDraw(wxControlRenderer *renderer)
 151 {
 152     renderer->DrawButtonBorder();
 153     renderer->DrawLabel(m_bitmap, m_marginBmpX, m_marginBmpY);
 154 }
 155
 156 // ----------------------------------------------------------------------------
 157 // input processing
 158 // ----------------------------------------------------------------------------
 159
 160 void wxButton::Press()
 161 {
 162     if ( !m_isPressed )
 163     {
 164         m_isPressed = TRUE;
 165
 166         Refresh();
 167     }
 168 }
 169
 170 void wxButton::Release()
 171 {
 172     if ( m_isPressed )
 173     {
 174         m_isPressed = FALSE;
 175
 176         Refresh();
 177     }
 178 }
 179
 180 void wxButton::Toggle()
 181 {
 182     if ( m_isPressed )
 183         Release();
 184     else
 185         Press();
 186
 187     if ( !m_isPressed )
 188     {
 189         // releasing button after it had been pressed generates a click event
 190         Click();
 191     }
 192 }
 193
 194 void wxButton::Click()
 195 {
 196     wxCommandEvent event(wxEVT_COMMAND_BUTTON_CLICKED, GetId());
 197     InitCommandEvent(event);
 198     Command(event);
 199 }
 200
 201 bool wxButton::PerformAction(const wxControlAction& action,
 202                              long numArg,
 203                              const wxString& strArg)
 204 {
 205     if ( action == wxACTION_BUTTON_TOGGLE )
 206         Toggle();
 207     else if ( action == wxACTION_BUTTON_CLICK )
 208         Click();
 209     else if ( action == wxACTION_BUTTON_PRESS )
 210         Press();
 211     else if ( action == wxACTION_BUTTON_RELEASE )
 212         Release();
 213     else
 214         return wxControl::PerformAction(action, numArg, strArg);
 215
 216     return TRUE;
 217 }
 218
 219 // ----------------------------------------------------------------------------
 220 // misc
 221 // ----------------------------------------------------------------------------
 222
 223 void wxButton::SetImageLabel(const wxBitmap& bitmap)
 224 {
 225     m_bitmap = bitmap;
 226
 227     SetImageMargins(DEFAULT_BTN_MARGIN_X, DEFAULT_BTN_MARGIN_Y);
 228 }
 229
 230 void wxButton::SetImageMargins(wxCoord x, wxCoord y)
 231 {
 232     m_marginBmpX = x;
 233     m_marginBmpY = y;
 234
 235     SetBestSize(wxDefaultSize);
 236 }
 237
 238 void wxButton::SetDefault()
 239 {
 240     m_isDefault = TRUE;
 241 }
 242
 243 // ============================================================================
 244 // wxStdButtonInputHandler
 245 // ============================================================================
 246
 247 wxStdButtonInputHandler::wxStdButtonInputHandler(wxInputHandler *handler)
 248                        : wxStdInputHandler(handler)
 249 {
 250     m_winCapture = NULL;
 251     m_winHasMouse = FALSE;
 252 }
 253
 254 bool wxStdButtonInputHandler::HandleKey(wxControl *control,
 255                                         const wxKeyEvent& event,
 256                                         bool pressed)
 257 {
 258     int keycode = event.GetKeyCode();
 259     if ( keycode == WXK_SPACE || keycode == WXK_RETURN )
 260     {
 261         control->PerformAction(wxACTION_BUTTON_TOGGLE);
 262
 263         return TRUE;
 264     }
 265
 266     return wxStdInputHandler::HandleKey(control, event, pressed);
 267 }
 268
 269 bool wxStdButtonInputHandler::HandleMouse(wxControl *control,
 270                                           const wxMouseEvent& event)
 271 {
 272     // the button has 2 states: pressed and normal with the following
 273     // transitions between them:
 274     //
 275     //      normal -> left down -> capture mouse and go to pressed state
 276     //      pressed -> left up inside -> generate click -> go to normal
 277     //                         outside ------------------>
 278     //
 279     // the other mouse buttons are ignored
 280     if ( event.Button(1) )
 281     {
 282         if ( event.ButtonDown(1) )
 283         {
 284             m_winCapture = control;
 285             m_winCapture->CaptureMouse();
 286             m_winHasMouse = TRUE;
 287
 288             control->PerformAction(wxACTION_BUTTON_PRESS);
 289
 290             return TRUE;
 291         }
 292         else // up
 293         {
 294             if ( m_winCapture )
 295             {
 296                 m_winCapture->ReleaseMouse();
 297                 m_winCapture = NULL;
 298             }
 299
 300             if ( m_winHasMouse )
 301             {
 302                 // this will generate a click event
 303                 control->PerformAction(wxACTION_BUTTON_TOGGLE);
 304
 305                 return TRUE;
 306             }
 307             //else: the mouse was released outside the window, this doesn't
 308             //      count as a click
 309         }
 310     }
 311
 312     return wxStdInputHandler::HandleMouse(control, event);
 313 }
 314
 315 bool wxStdButtonInputHandler::HandleMouseMove(wxControl *control,
 316                                               const wxMouseEvent& event)
 317 {
 318     // we only have to do something when the mouse leaves/enters the pressed
 319     // button and don't care about the other ones
 320     if ( event.GetEventObject() == m_winCapture )
 321     {
 322         // leaving the button should remove its pressed state
 323         if ( event.Leaving() )
 324         {
 325             // remember that the mouse is now outside
 326             m_winHasMouse = FALSE;
 327
 328             // we do have a pressed button, so release it
 329             control->SetCurrent(FALSE);
 330             control->PerformAction(wxACTION_BUTTON_RELEASE);
 331
 332             return TRUE;
 333         }
 334         // and entering it back should make it pressed again if it had been
 335         // pressed
 336         else if ( event.Entering() )
 337         {
 338             // the mouse is (back) inside the button
 339             m_winHasMouse = TRUE;
 340
 341             // we did have a pressed button which we released when leaving the
 342             // window, press it again
 343             control->SetCurrent(TRUE);
 344             control->PerformAction(wxACTION_BUTTON_PRESS);
 345
 346             return TRUE;
 347         }
 348     }
 349
 350     return wxStdInputHandler::HandleMouseMove(control, event);
 351 }
 352
 353 bool wxStdButtonInputHandler::HandleFocus(wxControl *control,
 354                                           const wxFocusEvent& event)
 355 {
 356     // buttons change appearance when they get/lose focus, so return TRUE to
 357     // refresh
 358     return TRUE;
 359 }
 360
 361 bool wxStdButtonInputHandler::HandleActivation(wxControl *control,
 362                                                bool activated)
 363 {
 364     // the default button changes appearance when the app is [de]activated, so
 365     // return TRUE to refresh
 366     return wxStaticCast(control, wxButton)->IsDefault();
 367 }
 368
 369 #endif // wxUSE_BUTTON
 370