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     if ( !(GetWindowStyle() & wxBU_EXACTFIT) )
 140     {
 141         wxSize szDef = GetDefaultSize();
 142         if ( width < szDef.x )
 143             width = szDef.x;
 144     }
 145
 146     return wxSize(width, height);
 147 }
 148
 149 // ----------------------------------------------------------------------------
 150 // drawing
 151 // ----------------------------------------------------------------------------
 152
 153 void wxButton::DoDraw(wxControlRenderer *renderer)
 154 {
 155     if ( !(GetWindowStyle() & wxBORDER_NONE) )
 156     {
 157         renderer->DrawButtonBorder();
 158     }
 159
 160     renderer->DrawLabel(m_bitmap, m_marginBmpX, m_marginBmpY);
 161 }
 162
 163 // ----------------------------------------------------------------------------
 164 // input processing
 165 // ----------------------------------------------------------------------------
 166
 167 void wxButton::Press()
 168 {
 169     if ( !m_isPressed )
 170     {
 171         m_isPressed = TRUE;
 172
 173         Refresh();
 174     }
 175 }
 176
 177 void wxButton::Release()
 178 {
 179     if ( m_isPressed )
 180     {
 181         m_isPressed = FALSE;
 182
 183         Refresh();
 184     }
 185 }
 186
 187 void wxButton::Toggle()
 188 {
 189     if ( m_isPressed )
 190         Release();
 191     else
 192         Press();
 193
 194     if ( !m_isPressed )
 195     {
 196         // releasing button after it had been pressed generates a click event
 197         Click();
 198     }
 199 }
 200
 201 void wxButton::Click()
 202 {
 203     wxCommandEvent event(wxEVT_COMMAND_BUTTON_CLICKED, GetId());
 204     InitCommandEvent(event);
 205     Command(event);
 206 }
 207
 208 bool wxButton::PerformAction(const wxControlAction& action,
 209                              long numArg,
 210                              const wxString& strArg)
 211 {
 212     if ( action == wxACTION_BUTTON_TOGGLE )
 213         Toggle();
 214     else if ( action == wxACTION_BUTTON_CLICK )
 215         Click();
 216     else if ( action == wxACTION_BUTTON_PRESS )
 217         Press();
 218     else if ( action == wxACTION_BUTTON_RELEASE )
 219         Release();
 220     else
 221         return wxControl::PerformAction(action, numArg, strArg);
 222
 223     return TRUE;
 224 }
 225
 226 // ----------------------------------------------------------------------------
 227 // misc
 228 // ----------------------------------------------------------------------------
 229
 230 void wxButton::SetImageLabel(const wxBitmap& bitmap)
 231 {
 232     m_bitmap = bitmap;
 233
 234     SetImageMargins(DEFAULT_BTN_MARGIN_X, DEFAULT_BTN_MARGIN_Y);
 235 }
 236
 237 void wxButton::SetImageMargins(wxCoord x, wxCoord y)
 238 {
 239     m_marginBmpX = x;
 240     m_marginBmpY = y;
 241
 242     SetBestSize(wxDefaultSize);
 243 }
 244
 245 void wxButton::SetDefault()
 246 {
 247     m_isDefault = TRUE;
 248 }
 249
 250 // ============================================================================
 251 // wxStdButtonInputHandler
 252 // ============================================================================
 253
 254 wxStdButtonInputHandler::wxStdButtonInputHandler(wxInputHandler *handler)
 255                        : wxStdInputHandler(handler)
 256 {
 257     m_winCapture = NULL;
 258     m_winHasMouse = FALSE;
 259 }
 260
 261 bool wxStdButtonInputHandler::HandleKey(wxControl *control,
 262                                         const wxKeyEvent& event,
 263                                         bool pressed)
 264 {
 265     int keycode = event.GetKeyCode();
 266     if ( keycode == WXK_SPACE || keycode == WXK_RETURN )
 267     {
 268         control->PerformAction(wxACTION_BUTTON_TOGGLE);
 269
 270         return TRUE;
 271     }
 272
 273     return wxStdInputHandler::HandleKey(control, event, pressed);
 274 }
 275
 276 bool wxStdButtonInputHandler::HandleMouse(wxControl *control,
 277                                           const wxMouseEvent& event)
 278 {
 279     // the button has 2 states: pressed and normal with the following
 280     // transitions between them:
 281     //
 282     //      normal -> left down -> capture mouse and go to pressed state
 283     //      pressed -> left up inside -> generate click -> go to normal
 284     //                         outside ------------------>
 285     //
 286     // the other mouse buttons are ignored
 287     if ( event.Button(1) )
 288     {
 289         if ( event.ButtonDown(1) )
 290         {
 291             m_winCapture = control;
 292             m_winCapture->CaptureMouse();
 293             m_winHasMouse = TRUE;
 294
 295             control->PerformAction(wxACTION_BUTTON_PRESS);
 296
 297             return TRUE;
 298         }
 299         else // up
 300         {
 301             if ( m_winCapture )
 302             {
 303                 m_winCapture->ReleaseMouse();
 304                 m_winCapture = NULL;
 305             }
 306
 307             if ( m_winHasMouse )
 308             {
 309                 // this will generate a click event
 310                 control->PerformAction(wxACTION_BUTTON_TOGGLE);
 311
 312                 return TRUE;
 313             }
 314             //else: the mouse was released outside the window, this doesn't
 315             //      count as a click
 316         }
 317     }
 318
 319     return wxStdInputHandler::HandleMouse(control, event);
 320 }
 321
 322 bool wxStdButtonInputHandler::HandleMouseMove(wxControl *control,
 323                                               const wxMouseEvent& event)
 324 {
 325     // we only have to do something when the mouse leaves/enters the pressed
 326     // button and don't care about the other ones
 327     if ( event.GetEventObject() == m_winCapture )
 328     {
 329         // leaving the button should remove its pressed state
 330         if ( event.Leaving() )
 331         {
 332             // remember that the mouse is now outside
 333             m_winHasMouse = FALSE;
 334
 335             // we do have a pressed button, so release it
 336             control->SetCurrent(FALSE);
 337             control->PerformAction(wxACTION_BUTTON_RELEASE);
 338
 339             return TRUE;
 340         }
 341         // and entering it back should make it pressed again if it had been
 342         // pressed
 343         else if ( event.Entering() )
 344         {
 345             // the mouse is (back) inside the button
 346             m_winHasMouse = TRUE;
 347
 348             // we did have a pressed button which we released when leaving the
 349             // window, press it again
 350             control->SetCurrent(TRUE);
 351             control->PerformAction(wxACTION_BUTTON_PRESS);
 352
 353             return TRUE;
 354         }
 355     }
 356
 357     return wxStdInputHandler::HandleMouseMove(control, event);
 358 }
 359
 360 bool wxStdButtonInputHandler::HandleFocus(wxControl *control,
 361                                           const wxFocusEvent& event)
 362 {
 363     // buttons change appearance when they get/lose focus, so return TRUE to
 364     // refresh
 365     return TRUE;
 366 }
 367
 368 bool wxStdButtonInputHandler::HandleActivation(wxControl *control,
 369                                                bool activated)
 370 {
 371     // the default button changes appearance when the app is [de]activated, so
 372     // return TRUE to refresh
 373     return wxStaticCast(control, wxButton)->IsDefault();
 374 }
 375
 376 #endif // wxUSE_BUTTON
 377