src/msw/button.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        msw/button.cpp
   3 // Purpose:     wxButton
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     04/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart and Markus Holzem
   9 // Licence:     wxWindows license
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 #ifdef __GNUG__
  21     #pragma implementation "button.h"
  22 #endif
  23
  24 // For compilers that support precompilation, includes "wx.h".
  25 #include "wx/wxprec.h"
  26
  27 #ifdef __BORLANDC__
  28     #pragma hdrstop
  29 #endif
  30
  31 #if wxUSE_BUTTON
  32
  33 #ifndef WX_PRECOMP
  34     #include "wx/button.h"
  35     #include "wx/brush.h"
  36     #include "wx/panel.h"
  37     #include "wx/bmpbuttn.h"
  38     #include "wx/settings.h"
  39     #include "wx/dcscreen.h"
  40 #endif
  41
  42 #include "wx/msw/private.h"
  43
  44 // ----------------------------------------------------------------------------
  45 // macros
  46 // ----------------------------------------------------------------------------
  47
  48 IMPLEMENT_DYNAMIC_CLASS(wxButton, wxControl)
  49
  50 // this macro tries to adjust the default button height to a reasonable value
  51 // using the char height as the base
  52 #define BUTTON_HEIGHT_FROM_CHAR_HEIGHT(cy) (11*EDIT_HEIGHT_FROM_CHAR_HEIGHT(cy)/10)
  53
  54 // ============================================================================
  55 // implementation
  56 // ============================================================================
  57
  58 // ----------------------------------------------------------------------------
  59 // creation/destruction
  60 // ----------------------------------------------------------------------------
  61
  62 bool wxButton::Create(wxWindow *parent,
  63                       wxWindowID id,
  64                       const wxString& label,
  65                       const wxPoint& pos,
  66                       const wxSize& size,
  67                       long style,
  68                       const wxValidator& validator,
  69                       const wxString& name)
  70 {
  71     if ( !CreateBase(parent, id, pos, size, style, validator, name) )
  72         return FALSE;
  73
  74     parent->AddChild((wxButton *)this);
  75
  76     m_backgroundColour = parent->GetBackgroundColour();
  77     m_foregroundColour = parent->GetForegroundColour();
  78
  79     long msStyle = WS_VISIBLE | WS_TABSTOP | WS_CHILD /* | WS_CLIPSIBLINGS */ ;
  80
  81     if ( m_windowStyle & wxCLIP_SIBLINGS )
  82         msStyle |= WS_CLIPSIBLINGS;
  83
  84 #ifdef __WIN32__
  85     if(m_windowStyle & wxBU_LEFT)
  86         msStyle |= BS_LEFT;
  87     if(m_windowStyle & wxBU_RIGHT)
  88         msStyle |= BS_RIGHT;
  89     if(m_windowStyle & wxBU_TOP)
  90         msStyle |= BS_TOP;
  91     if(m_windowStyle & wxBU_BOTTOM)
  92         msStyle |= BS_BOTTOM;
  93 #endif
  94
  95     m_hWnd = (WXHWND)CreateWindowEx
  96                      (
  97                       MakeExtendedStyle(m_windowStyle),
  98                       wxT("BUTTON"),
  99                       label,
 100                       msStyle,
 101                       0, 0, 0, 0,
 102                       GetWinHwnd(parent),
 103                       (HMENU)m_windowId,
 104                       wxGetInstance(),
 105                       NULL
 106                      );
 107
 108     if (m_hWnd == 0)
 109     {
 110         wxString msg;
 111 #ifdef __WIN16__
 112         msg.Printf(wxT("CreateWindowEx failed"));
 113 #else
 114         msg.Printf(wxT("CreateWindowEx failed with error number %ld"), (long) GetLastError());
 115 #endif
 116         wxFAIL_MSG(msg);
 117     }
 118
 119     // Subclass again for purposes of dialog editing mode
 120     SubclassWin(m_hWnd);
 121
 122     SetFont(parent->GetFont());
 123
 124     SetSize(pos.x, pos.y, size.x, size.y);
 125
 126     return TRUE;
 127 }
 128
 129 wxButton::~wxButton()
 130 {
 131 }
 132
 133 // ----------------------------------------------------------------------------
 134 // size management including autosizing
 135 // ----------------------------------------------------------------------------
 136
 137 wxSize wxButton::DoGetBestSize() const
 138 {
 139     wxString label = wxGetWindowText(GetHWND());
 140     int wBtn;
 141     GetTextExtent(label, &wBtn, NULL);
 142
 143     int wChar, hChar;
 144     wxGetCharSize(GetHWND(), &wChar, &hChar, &GetFont());
 145
 146     // add a margin - the button is wider than just its label
 147     wBtn += 3*wChar;
 148
 149     // the button height is proportional to the height of the font used
 150     int hBtn = BUTTON_HEIGHT_FROM_CHAR_HEIGHT(hChar);
 151
 152     wxSize sz = GetDefaultSize();
 153     if (wBtn > sz.x) sz.x = wBtn;
 154     if (hBtn > sz.y) sz.y = hBtn;
 155
 156     return sz;
 157 }
 158
 159 /* static */
 160 wxSize wxButtonBase::GetDefaultSize()
 161 {
 162     static wxSize s_sizeBtn;
 163
 164     if ( s_sizeBtn.x == 0 )
 165     {
 166         wxScreenDC dc;
 167         dc.SetFont(wxSystemSettings::GetSystemFont(wxSYS_DEFAULT_GUI_FONT));
 168
 169         // the size of a standard button in the dialog units is 50x14,
 170         // translate this to pixels
 171         // NB1: the multipliers come from the Windows convention
 172         // NB2: the extra +1/+2 were needed to get the size be the same as the
 173         //      size of the buttons in the standard dialog - I don't know how
 174         //      this happens, but on my system this size is 75x23 in pixels and
 175         //      23*8 isn't even divisible by 14... Would be nice to understand
 176         //      why these constants are needed though!
 177         s_sizeBtn.x = (50 * (dc.GetCharWidth() + 1))/4;
 178         s_sizeBtn.y = ((14 * dc.GetCharHeight()) + 2)/8;
 179     }
 180
 181     return s_sizeBtn;
 182 }
 183
 184 // ----------------------------------------------------------------------------
 185 // set this button as the default one in its panel
 186 // ----------------------------------------------------------------------------
 187
 188 void wxButton::SetDefault()
 189 {
 190     wxWindow *parent = GetParent();
 191     wxButton *btnOldDefault;
 192     if ( parent )
 193     {
 194         wxWindow *winOldDefault = parent->SetDefaultItem(this);
 195         btnOldDefault = wxDynamicCast(winOldDefault, wxButton);
 196
 197         ::SendMessage(GetWinHwnd(parent), DM_SETDEFID, m_windowId, 0L);
 198     }
 199     else // is a button without parent really normal?
 200     {
 201         btnOldDefault = NULL;
 202     }
 203
 204     if ( btnOldDefault && btnOldDefault != this )
 205     {
 206         // remove the BS_DEFPUSHBUTTON style from the other button
 207         long style = GetWindowLong(GetHwndOf(btnOldDefault), GWL_STYLE);
 208
 209         // don't do it with the owner drawn buttons because it will reset
 210         // BS_OWNERDRAW style bit too (BS_OWNERDRAW & BS_DEFPUSHBUTTON != 0)!
 211         if ( (style & BS_OWNERDRAW) != BS_OWNERDRAW )
 212         {
 213             style &= ~BS_DEFPUSHBUTTON;
 214             SendMessage(GetHwndOf(btnOldDefault), BM_SETSTYLE, style, 1L);
 215         }
 216         else
 217         {
 218             // redraw the button - it will notice itself that it's not the
 219             // default one any longer
 220             btnOldDefault->Refresh();
 221         }
 222     }
 223
 224     // set this button as the default
 225     long style = GetWindowLong(GetHwnd(), GWL_STYLE);
 226     if ( (style & BS_OWNERDRAW) != BS_OWNERDRAW )
 227     {
 228         style |= BS_DEFPUSHBUTTON;
 229         SendMessage(GetHwnd(), BM_SETSTYLE, style, 1L);
 230     }
 231 }
 232
 233 // ----------------------------------------------------------------------------
 234 // helpers
 235 // ----------------------------------------------------------------------------
 236
 237 bool wxButton::SendClickEvent()
 238 {
 239     wxCommandEvent event(wxEVT_COMMAND_BUTTON_CLICKED, GetId());
 240     event.SetEventObject(this);
 241
 242     return ProcessCommand(event);
 243 }
 244
 245 void wxButton::Command(wxCommandEvent & event)
 246 {
 247     ProcessCommand(event);
 248 }
 249
 250 // ----------------------------------------------------------------------------
 251 // event/message handlers
 252 // ----------------------------------------------------------------------------
 253
 254 bool wxButton::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 255 {
 256     bool processed = FALSE;
 257     switch ( param )
 258     {
 259         case 1:                     // message came from an accelerator
 260         case BN_CLICKED:            // normal buttons send this
 261         case BN_DOUBLECLICKED:      // owner-drawn ones also send this
 262             processed = SendClickEvent();
 263             break;
 264     }
 265
 266     return processed;
 267 }
 268
 269 long wxButton::MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam)
 270 {
 271     // when we receive focus, we want to become the default button in our
 272     // parent panel
 273     if ( nMsg == WM_SETFOCUS )
 274     {
 275         SetDefault();
 276
 277         // let the default processign take place too
 278     }
 279     else if ( nMsg == WM_LBUTTONDBLCLK )
 280     {
 281         // emulate a click event to force an owner-drawn button to change its
 282         // appearance - without this, it won't do it
 283         (void)wxControl::MSWWindowProc(WM_LBUTTONDOWN, wParam, lParam);
 284
 285         // and conitnue with processing the message normally as well
 286     }
 287
 288     // let the base class do all real processing
 289     return wxControl::MSWWindowProc(nMsg, wParam, lParam);
 290 }
 291
 292 // ----------------------------------------------------------------------------
 293 // owner-drawn buttons support
 294 // ----------------------------------------------------------------------------
 295
 296 #ifdef __WIN32__
 297
 298 // drawing helpers
 299
 300 static void DrawButtonText(HDC hdc,
 301                            RECT *pRect,
 302                            const wxString& text,
 303                            COLORREF col)
 304 {
 305     COLORREF colOld = SetTextColor(hdc, col);
 306     int modeOld = SetBkMode(hdc, TRANSPARENT);
 307
 308     DrawText(hdc, text, text.length(), pRect,
 309              DT_CENTER | DT_VCENTER | DT_SINGLELINE);
 310
 311     SetBkMode(hdc, modeOld);
 312     SetTextColor(hdc, colOld);
 313 }
 314
 315 static void DrawRect(HDC hdc, const RECT& r)
 316 {
 317     MoveToEx(hdc, r.left, r.top, NULL);
 318     LineTo(hdc, r.right, r.top);
 319     LineTo(hdc, r.right, r.bottom);
 320     LineTo(hdc, r.left, r.bottom);
 321     LineTo(hdc, r.left, r.top);
 322 }
 323
 324 void wxButton::MakeOwnerDrawn()
 325 {
 326     long style = GetWindowLong(GetHwnd(), GWL_STYLE);
 327     if ( (style & BS_OWNERDRAW) != BS_OWNERDRAW )
 328     {
 329         // make it so
 330         style |= BS_OWNERDRAW;
 331         SetWindowLong(GetHwnd(), GWL_STYLE, style);
 332     }
 333 }
 334
 335 bool wxButton::SetBackgroundColour(const wxColour &colour)
 336 {
 337     if ( !wxControl::SetBackgroundColour(colour) )
 338     {
 339         // nothing to do
 340         return FALSE;
 341     }
 342
 343     MakeOwnerDrawn();
 344
 345     Refresh();
 346
 347     return TRUE;
 348 }
 349
 350 bool wxButton::SetForegroundColour(const wxColour &colour)
 351 {
 352     if ( !wxControl::SetForegroundColour(colour) )
 353     {
 354         // nothing to do
 355         return FALSE;
 356     }
 357
 358     MakeOwnerDrawn();
 359
 360     Refresh();
 361
 362     return TRUE;
 363 }
 364
 365 /*
 366    The button frame looks like this normally:
 367
 368    WWWWWWWWWWWWWWWWWWB
 369    WHHHHHHHHHHHHHHHHGB  W = white       (HILIGHT)
 370    WH               GB  H = light grey  (LIGHT)
 371    WH               GB  G = dark grey   (SHADOW)
 372    WH               GB  B = black       (DKSHADOW)
 373    WH               GB
 374    WGGGGGGGGGGGGGGGGGB
 375    BBBBBBBBBBBBBBBBBBB
 376
 377    When the button is selected, the button becomes like this (the total button
 378    size doesn't change):
 379
 380    BBBBBBBBBBBBBBBBBBB
 381    BWWWWWWWWWWWWWWWWBB
 382    BWHHHHHHHHHHHHHHGBB
 383    BWH             GBB
 384    BWH             GBB
 385    BWGGGGGGGGGGGGGGGBB
 386    BBBBBBBBBBBBBBBBBBB
 387    BBBBBBBBBBBBBBBBBBB
 388
 389    When the button is pushed (while selected) it is like:
 390
 391    BBBBBBBBBBBBBBBBBBB
 392    BGGGGGGGGGGGGGGGGGB
 393    BG               GB
 394    BG               GB
 395    BG               GB
 396    BG               GB
 397    BGGGGGGGGGGGGGGGGGB
 398    BBBBBBBBBBBBBBBBBBB
 399 */
 400
 401 static void DrawButtonFrame(HDC hdc, const RECT& rectBtn,
 402                             bool selected, bool pushed)
 403 {
 404     RECT r;
 405     CopyRect(&r, &rectBtn);
 406
 407     HPEN hpenBlack   = CreatePen(PS_SOLID, 1, GetSysColor(COLOR_3DDKSHADOW)),
 408          hpenGrey    = CreatePen(PS_SOLID, 1, GetSysColor(COLOR_3DSHADOW)),
 409          hpenLightGr = CreatePen(PS_SOLID, 1, GetSysColor(COLOR_3DLIGHT)),
 410          hpenWhite   = CreatePen(PS_SOLID, 1, GetSysColor(COLOR_3DHILIGHT));
 411
 412     HPEN hpenOld = (HPEN)SelectObject(hdc, hpenBlack);
 413
 414     r.right--;
 415     r.bottom--;
 416
 417     if ( pushed )
 418     {
 419         DrawRect(hdc, r);
 420
 421         (void)SelectObject(hdc, hpenGrey);
 422         InflateRect(&r, -1, -1);
 423
 424         DrawRect(hdc, r);
 425     }
 426     else // !pushed
 427     {
 428         if ( selected )
 429         {
 430             DrawRect(hdc, r);
 431
 432             InflateRect(&r, -1, -1);
 433         }
 434
 435         MoveToEx(hdc, r.left, r.bottom, NULL);
 436         LineTo(hdc, r.right, r.bottom);
 437         LineTo(hdc, r.right, r.top - 1);
 438
 439         (void)SelectObject(hdc, hpenWhite);
 440         MoveToEx(hdc, r.left, r.bottom - 1, NULL);
 441         LineTo(hdc, r.left, r.top);
 442         LineTo(hdc, r.right, r.top);
 443
 444         (void)SelectObject(hdc, hpenLightGr);
 445         MoveToEx(hdc, r.left + 1, r.bottom - 2, NULL);
 446         LineTo(hdc, r.left + 1, r.top + 1);
 447         LineTo(hdc, r.right - 1, r.top + 1);
 448
 449         (void)SelectObject(hdc, hpenGrey);
 450         MoveToEx(hdc, r.left + 1, r.bottom - 1, NULL);
 451         LineTo(hdc, r.right - 1, r.bottom - 1);
 452         LineTo(hdc, r.right - 1, r.top);
 453     }
 454
 455     (void)SelectObject(hdc, hpenOld);
 456     DeleteObject(hpenWhite);
 457     DeleteObject(hpenLightGr);
 458     DeleteObject(hpenGrey);
 459     DeleteObject(hpenBlack);
 460 }
 461
 462 bool wxButton::MSWOnDraw(WXDRAWITEMSTRUCT *wxdis)
 463 {
 464     LPDRAWITEMSTRUCT lpDIS = (LPDRAWITEMSTRUCT)wxdis;
 465
 466     RECT rectBtn;
 467     CopyRect(&rectBtn, &lpDIS->rcItem);
 468
 469     COLORREF colBg = wxColourToRGB(GetBackgroundColour()),
 470              colFg = wxColourToRGB(GetForegroundColour());
 471
 472     HDC hdc = lpDIS->hDC;
 473     UINT state = lpDIS->itemState;
 474
 475     // first, draw the background
 476     HBRUSH hbrushBackground = ::CreateSolidBrush(colBg);
 477
 478     FillRect(hdc, &rectBtn, hbrushBackground);
 479
 480     // draw the border for the current state
 481     bool selected = (state & ODS_SELECTED) != 0;
 482     if ( !selected )
 483     {
 484         wxPanel *panel = wxDynamicCast(GetParent(), wxPanel);
 485         if ( panel )
 486         {
 487             selected = panel->GetDefaultItem() == this;
 488         }
 489     }
 490     bool pushed = (SendMessage(GetHwnd(), BM_GETSTATE, 0, 0) & BST_PUSHED) != 0;
 491
 492     DrawButtonFrame(hdc, rectBtn, selected, pushed);
 493
 494     // draw the focus rect if needed
 495     if ( state & ODS_FOCUS )
 496     {
 497         RECT rectFocus;
 498         CopyRect(&rectFocus, &rectBtn);
 499
 500         // I don't know where does this constant come from, but this is how
 501         // Windows draws them
 502         InflateRect(&rectFocus, -4, -4);
 503
 504         DrawFocusRect(hdc, &rectFocus);
 505     }
 506
 507     if ( pushed )
 508     {
 509         // the label is shifted by 1 pixel to create "pushed" effect
 510         OffsetRect(&rectBtn, 1, 1);
 511     }
 512
 513     DrawButtonText(hdc, &rectBtn, GetLabel(),
 514                    state & ODS_DISABLED ? GetSysColor(COLOR_GRAYTEXT)
 515                                         : colFg);
 516
 517     ::DeleteObject(hbrushBackground);
 518
 519     return TRUE;
 520 }
 521
 522 #endif // __WIN32__
 523
 524 #endif // wxUSE_BUTTON
 525