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     #include "wx/settings.h"
  38 #endif
  39
  40 #include "wx/univ/renderer.h"
  41 #include "wx/univ/inphand.h"
  42 #include "wx/univ/theme.h"
  43 #include "wx/univ/colschem.h"
  44
  45 // ----------------------------------------------------------------------------
  46 // constants
  47 // ----------------------------------------------------------------------------
  48
  49 // default margins around the image
  50 static const wxCoord DEFAULT_BTN_MARGIN_X = 0;  // We should give space for the border, at least.
  51 static const wxCoord DEFAULT_BTN_MARGIN_Y = 0;
  52
  53 // ============================================================================
  54 // implementation
  55 // ============================================================================
  56
  57 IMPLEMENT_DYNAMIC_CLASS(wxButton, wxControl)
  58
  59 // ----------------------------------------------------------------------------
  60 // creation
  61 // ----------------------------------------------------------------------------
  62
  63 void wxButton::Init()
  64 {
  65     m_isPressed =
  66     m_isDefault = FALSE;
  67 }
  68
  69 bool wxButton::Create(wxWindow *parent,
  70                       wxWindowID id,
  71                       const wxBitmap& bitmap,
  72                       const wxString &label,
  73                       const wxPoint &pos,
  74                       const wxSize &size,
  75                       long style,
  76                       const wxValidator& validator,
  77                       const wxString &name)
  78 {
  79     // center label by default
  80     if ( !(style & wxALIGN_MASK) )
  81     {
  82         style |= wxALIGN_CENTRE_HORIZONTAL | wxALIGN_CENTRE_VERTICAL;
  83     }
  84
  85     if ( !wxControl::Create(parent, id, pos, size, style, wxDefaultValidator, name) )
  86         return FALSE;
  87
  88     SetLabel(label);
  89     SetImageLabel(bitmap);
  90     // SetBestSize(size); -- called by SetImageLabel()
  91
  92     CreateInputHandler(wxINP_HANDLER_BUTTON);
  93
  94     return TRUE;
  95 }
  96
  97 wxButton::~wxButton()
  98 {
  99 }
 100
 101 // ----------------------------------------------------------------------------
 102 // size management
 103 // ----------------------------------------------------------------------------
 104
 105 /* static */
 106 wxSize wxButtonBase::GetDefaultSize()
 107 {
 108     static wxSize s_sizeBtn;
 109
 110     if ( s_sizeBtn.x == 0 )
 111     {
 112         wxScreenDC dc;
 113
 114         // this corresponds more or less to wxMSW standard in Win32 theme (see
 115         // wxWin32Renderer::AdjustSize())
 116         s_sizeBtn.x = 8*dc.GetCharWidth();
 117         s_sizeBtn.y = (11*dc.GetCharHeight())/10 + 2;
 118     }
 119
 120     return s_sizeBtn;
 121 }
 122
 123 wxSize wxButton::DoGetBestClientSize() const
 124 {
 125     wxClientDC dc(wxConstCast(this, wxButton));
 126     wxCoord width, height;
 127     dc.GetMultiLineTextExtent(GetLabel(), &width, &height);
 128
 129     if ( m_bitmap.Ok() )
 130     {
 131         // allocate extra space for the bitmap
 132         wxCoord heightBmp = m_bitmap.GetHeight() + 2*m_marginBmpY;
 133         if ( height < heightBmp )
 134             height = heightBmp;
 135
 136         width += m_bitmap.GetWidth() + 2*m_marginBmpX;
 137     }
 138
 139     // for compatibility with other ports, the buttons default size is never
 140     // less than the standard one, but not when display not PDAs.
 141     if (wxSystemSettings::GetScreen() < wxSYS_SCREEN_PDA)
 142     {
 143         if ( !(GetWindowStyle() & wxBU_EXACTFIT) )
 144         {
 145             wxSize szDef = GetDefaultSize();
 146             if ( width < szDef.x )
 147                 width = szDef.x;
 148         }
 149     }
 150
 151     return wxSize(width, height);
 152 }
 153
 154 // ----------------------------------------------------------------------------
 155 // drawing
 156 // ----------------------------------------------------------------------------
 157
 158 void wxButton::DoDraw(wxControlRenderer *renderer)
 159 {
 160     if ( !(GetWindowStyle() & wxBORDER_NONE) )
 161     {
 162         renderer->DrawButtonBorder();
 163     }
 164
 165     renderer->DrawLabel(m_bitmap, m_marginBmpX, m_marginBmpY);
 166 }
 167
 168 bool wxButton::DoDrawBackground(wxDC& dc)
 169 {
 170     wxRect rect;
 171     wxSize size = GetSize();
 172     rect.width = size.x;
 173     rect.height = size.y;
 174
 175     if ( GetBackgroundBitmap().Ok() )
 176     {
 177         // get the bitmap and the flags
 178         int alignment;
 179         wxStretch stretch;
 180         wxBitmap bmp = GetBackgroundBitmap(&alignment, &stretch);
 181         wxControlRenderer::DrawBitmap(dc, bmp, rect, alignment, stretch);
 182     }
 183     else
 184     {
 185         m_renderer->DrawButtonSurface(dc, wxTHEME_BG_COLOUR(this),
 186                                       rect, GetStateFlags());
 187     }
 188
 189     return TRUE;
 190 }
 191
 192 // ----------------------------------------------------------------------------
 193 // input processing
 194 // ----------------------------------------------------------------------------
 195
 196 void wxButton::Press()
 197 {
 198     if ( !m_isPressed )
 199     {
 200         m_isPressed = TRUE;
 201
 202         Refresh();
 203     }
 204 }
 205
 206 void wxButton::Release()
 207 {
 208     if ( m_isPressed )
 209     {
 210         m_isPressed = FALSE;
 211
 212         Refresh();
 213     }
 214 }
 215
 216 void wxButton::Toggle()
 217 {
 218     if ( m_isPressed )
 219         Release();
 220     else
 221         Press();
 222
 223     if ( !m_isPressed )
 224     {
 225         // releasing button after it had been pressed generates a click event
 226         Click();
 227     }
 228 }
 229
 230 void wxButton::Click()
 231 {
 232     wxCommandEvent event(wxEVT_COMMAND_BUTTON_CLICKED, GetId());
 233     InitCommandEvent(event);
 234     Command(event);
 235 }
 236
 237 bool wxButton::PerformAction(const wxControlAction& action,
 238                              long numArg,
 239                              const wxString& strArg)
 240 {
 241     if ( action == wxACTION_BUTTON_TOGGLE )
 242         Toggle();
 243     else if ( action == wxACTION_BUTTON_CLICK )
 244         Click();
 245     else if ( action == wxACTION_BUTTON_PRESS )
 246         Press();
 247     else if ( action == wxACTION_BUTTON_RELEASE )
 248         Release();
 249     else
 250         return wxControl::PerformAction(action, numArg, strArg);
 251
 252     return TRUE;
 253 }
 254
 255 // ----------------------------------------------------------------------------
 256 // misc
 257 // ----------------------------------------------------------------------------
 258
 259 void wxButton::SetImageLabel(const wxBitmap& bitmap)
 260 {
 261     m_bitmap = bitmap;
 262
 263     SetImageMargins(DEFAULT_BTN_MARGIN_X, DEFAULT_BTN_MARGIN_Y);
 264 }
 265
 266 void wxButton::SetImageMargins(wxCoord x, wxCoord y)
 267 {
 268     m_marginBmpX = x + 2;
 269     m_marginBmpY = y + 2;
 270
 271     SetBestSize(wxDefaultSize);
 272 }
 273
 274 void wxButton::SetDefault()
 275 {
 276     m_isDefault = TRUE;
 277 }
 278
 279 // ============================================================================
 280 // wxStdButtonInputHandler
 281 // ============================================================================
 282
 283 wxStdButtonInputHandler::wxStdButtonInputHandler(wxInputHandler *handler)
 284                        : wxStdInputHandler(handler)
 285 {
 286     m_winCapture = NULL;
 287     m_winHasMouse = FALSE;
 288 }
 289
 290 bool wxStdButtonInputHandler::HandleKey(wxInputConsumer *consumer,
 291                                         const wxKeyEvent& event,
 292                                         bool pressed)
 293 {
 294     int keycode = event.GetKeyCode();
 295     if ( keycode == WXK_SPACE || keycode == WXK_RETURN )
 296     {
 297         consumer->PerformAction(wxACTION_BUTTON_TOGGLE);
 298
 299         return TRUE;
 300     }
 301
 302     return wxStdInputHandler::HandleKey(consumer, event, pressed);
 303 }
 304
 305 bool wxStdButtonInputHandler::HandleMouse(wxInputConsumer *consumer,
 306                                           const wxMouseEvent& event)
 307 {
 308     // the button has 2 states: pressed and normal with the following
 309     // transitions between them:
 310     //
 311     //      normal -> left down -> capture mouse and go to pressed state
 312     //      pressed -> left up inside -> generate click -> go to normal
 313     //                         outside ------------------>
 314     //
 315     // the other mouse buttons are ignored
 316     if ( event.Button(1) )
 317     {
 318         if ( event.LeftDown() || event.LeftDClick() )
 319         {
 320             m_winCapture = consumer->GetInputWindow();
 321             m_winCapture->CaptureMouse();
 322             m_winHasMouse = TRUE;
 323
 324             consumer->PerformAction(wxACTION_BUTTON_PRESS);
 325
 326             return TRUE;
 327         }
 328         else if ( event.LeftUp() )
 329         {
 330             if ( m_winCapture )
 331             {
 332                 m_winCapture->ReleaseMouse();
 333                 m_winCapture = NULL;
 334             }
 335
 336             if ( m_winHasMouse )
 337             {
 338                 // this will generate a click event
 339                 consumer->PerformAction(wxACTION_BUTTON_TOGGLE);
 340
 341                 return TRUE;
 342             }
 343             //else: the mouse was released outside the window, this doesn't
 344             //      count as a click
 345         }
 346         //else: don't do anything special about the double click
 347     }
 348
 349     return wxStdInputHandler::HandleMouse(consumer, event);
 350 }
 351
 352 bool wxStdButtonInputHandler::HandleMouseMove(wxInputConsumer *consumer,
 353                                               const wxMouseEvent& event)
 354 {
 355     // we only have to do something when the mouse leaves/enters the pressed
 356     // button and don't care about the other ones
 357     if ( event.GetEventObject() == m_winCapture )
 358     {
 359         // leaving the button should remove its pressed state
 360         if ( event.Leaving() )
 361         {
 362             // remember that the mouse is now outside
 363             m_winHasMouse = FALSE;
 364
 365             // we do have a pressed button, so release it
 366             consumer->GetInputWindow()->SetCurrent(FALSE);
 367             consumer->PerformAction(wxACTION_BUTTON_RELEASE);
 368
 369             return TRUE;
 370         }
 371         // and entering it back should make it pressed again if it had been
 372         // pressed
 373         else if ( event.Entering() )
 374         {
 375             // the mouse is (back) inside the button
 376             m_winHasMouse = TRUE;
 377
 378             // we did have a pressed button which we released when leaving the
 379             // window, press it again
 380             consumer->GetInputWindow()->SetCurrent(TRUE);
 381             consumer->PerformAction(wxACTION_BUTTON_PRESS);
 382
 383             return TRUE;
 384         }
 385     }
 386
 387     return wxStdInputHandler::HandleMouseMove(consumer, event);
 388 }
 389
 390 bool wxStdButtonInputHandler::HandleFocus(wxInputConsumer *consumer,
 391                                           const wxFocusEvent& event)
 392 {
 393     // buttons change appearance when they get/lose focus, so return TRUE to
 394     // refresh
 395     return TRUE;
 396 }
 397
 398 bool wxStdButtonInputHandler::HandleActivation(wxInputConsumer *consumer,
 399                                                bool activated)
 400 {
 401     // the default button changes appearance when the app is [de]activated, so
 402     // return TRUE to refresh
 403     return wxStaticCast(consumer->GetInputWindow(), wxButton)->IsDefault();
 404 }
 405
 406 #endif // wxUSE_BUTTON
 407