src/msw/button.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        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 #ifdef __GNUG__
  20     #pragma implementation "button.h"
  21 #endif
  22
  23 // For compilers that support precompilation, includes "wx.h".
  24 #include "wx/wxprec.h"
  25
  26 #ifdef __BORLANDC__
  27     #pragma hdrstop
  28 #endif
  29
  30 #ifndef WX_PRECOMP
  31     #include "wx/button.h"
  32     #include "wx/brush.h"
  33     #include "wx/panel.h"
  34     #include "wx/bmpbuttn.h"
  35     #include "wx/settings.h"
  36     #include "wx/dcscreen.h"
  37 #endif
  38
  39 #include "wx/msw/private.h"
  40
  41 // ----------------------------------------------------------------------------
  42 // macros
  43 // ----------------------------------------------------------------------------
  44
  45 #if !USE_SHARED_LIBRARY
  46     IMPLEMENT_DYNAMIC_CLASS(wxButton, wxControl)
  47 #endif
  48
  49 // this macro tries to adjust the default button height to a reasonable value
  50 // using the char height as the base
  51 #define BUTTON_HEIGHT_FROM_CHAR_HEIGHT(cy) (11*EDIT_HEIGHT_FROM_CHAR_HEIGHT(cy)/10)
  52
  53 // ============================================================================
  54 // implementation
  55 // ============================================================================
  56
  57 // ----------------------------------------------------------------------------
  58 // creation/destruction
  59 // ----------------------------------------------------------------------------
  60
  61 bool wxButton::Create(wxWindow *parent,
  62                       wxWindowID id,
  63                       const wxString& label,
  64                       const wxPoint& pos,
  65                       const wxSize& size,
  66                       long style,
  67                       const wxValidator& validator,
  68                       const wxString& name)
  69 {
  70     if ( !CreateBase(parent, id, pos, size, style, validator, name) )
  71         return FALSE;
  72
  73     // Validator was set in CreateBase
  74     //SetValidator(validator);
  75
  76     parent->AddChild((wxButton *)this);
  77
  78     m_backgroundColour = parent->GetBackgroundColour() ;
  79     m_foregroundColour = parent->GetForegroundColour() ;
  80
  81     m_hWnd = (WXHWND)CreateWindowEx
  82                      (
  83                       MakeExtendedStyle(m_windowStyle),
  84                       T("BUTTON"),
  85                       label,
  86                       WS_VISIBLE | WS_TABSTOP | WS_CHILD,
  87                       0, 0, 0, 0,
  88                       GetWinHwnd(parent),
  89                       (HMENU)m_windowId,
  90                       wxGetInstance(),
  91                       NULL
  92                      );
  93
  94     // Subclass again for purposes of dialog editing mode
  95     SubclassWin(m_hWnd);
  96
  97     SetFont(parent->GetFont());
  98
  99     SetSize(pos.x, pos.y, size.x, size.y);
 100
 101     // bad hack added by Robert to make buttons at least
 102     // 80 pixels wide. There are probably better ways...
 103     // TODO. FIXME.
 104     wxSize nsize( GetSize() );
 105     if ((nsize.x < 80) || (nsize.y < 23))
 106     {
 107         if ((size.x == -1) && (nsize.x < 80)) nsize.x = 80;
 108         if ((size.y == -1) && (nsize.y < 23)) nsize.y = 23;
 109         SetSize( nsize );
 110     }
 111
 112     return TRUE;
 113 }
 114
 115 wxButton::~wxButton()
 116 {
 117     wxPanel *panel = wxDynamicCast(GetParent(), wxPanel);
 118     if ( panel )
 119     {
 120         if ( panel->GetDefaultItem() == this )
 121         {
 122             // don't leave the panel with invalid default item
 123             panel->SetDefaultItem(NULL);
 124         }
 125     }
 126 }
 127
 128 // ----------------------------------------------------------------------------
 129 // size management including autosizing
 130 // ----------------------------------------------------------------------------
 131
 132 wxSize wxButton::DoGetBestSize()
 133 {
 134     wxString label = wxGetWindowText(GetHWND());
 135     int wBtn;
 136     GetTextExtent(label, &wBtn, NULL);
 137
 138     int wChar, hChar;
 139     wxGetCharSize(GetHWND(), &wChar, &hChar, &GetFont());
 140
 141     // add a margin - the button is wider than just its label
 142     wBtn += 3*wChar;
 143
 144     // the button height is proportional to the height of the font used
 145     int hBtn = BUTTON_HEIGHT_FROM_CHAR_HEIGHT(hChar);
 146
 147     return wxSize(wBtn, hBtn);
 148 }
 149
 150 /* static */
 151 wxSize wxButton::GetDefaultSize()
 152 {
 153     static wxSize s_sizeBtn;
 154
 155     if ( s_sizeBtn.x == 0 )
 156     {
 157         wxScreenDC dc;
 158         dc.SetFont(wxSystemSettings::GetSystemFont(wxSYS_DEFAULT_GUI_FONT));
 159
 160         // the size of a standard button in the dialog units is 50x14,
 161         // translate this to pixels
 162         // NB1: the multipliers come from the Windows convention
 163         // NB2: the extra +1/+2 were needed to get the size be the same as the
 164         //      size of the buttons in the standard dialog - I don't know how
 165         //      this happens, but on my system this size is 75x23 in pixels and
 166         //      23*8 isn't even divisible by 14... Would be nice to understand
 167         //      why these constants are needed though!
 168         s_sizeBtn.x = (50 * (dc.GetCharWidth() + 1))/4;
 169         s_sizeBtn.y = ((14 * dc.GetCharHeight()) + 2)/8;
 170     }
 171
 172     return s_sizeBtn;
 173 }
 174
 175 // ----------------------------------------------------------------------------
 176 // set this button as the default one in its panel
 177 // ----------------------------------------------------------------------------
 178
 179 void wxButton::SetDefault()
 180 {
 181     wxWindow *parent = GetParent();
 182     wxButton *btnOldDefault = NULL;
 183     wxPanel *panel = wxDynamicCast(parent, wxPanel);
 184     if ( panel )
 185     {
 186         btnOldDefault = panel->GetDefaultItem();
 187         panel->SetDefaultItem(this);
 188     }
 189
 190     if ( parent )
 191     {
 192         SendMessage(GetWinHwnd(parent), DM_SETDEFID, m_windowId, 0L);
 193     }
 194
 195     // this doesn't work with bitmap buttons because it also removes the
 196     // "ownerdrawn" style...
 197     if ( btnOldDefault && !wxDynamicCast(btnOldDefault, wxBitmapButton) )
 198     {
 199         // remove the BS_DEFPUSHBUTTON style from the other button
 200         long style = GetWindowLong(GetHwndOf(btnOldDefault), GWL_STYLE);
 201         style &= ~BS_DEFPUSHBUTTON;
 202         SendMessage(GetHwndOf(btnOldDefault), BM_SETSTYLE, style, 1L);
 203     }
 204
 205     // set this button as the default
 206     long style = GetWindowLong(GetHwnd(), GWL_STYLE);
 207     style |= BS_DEFPUSHBUTTON;
 208     SendMessage(GetHwnd(), BM_SETSTYLE, style, 1L);
 209 }
 210
 211 // ----------------------------------------------------------------------------
 212 // helpers
 213 // ----------------------------------------------------------------------------
 214
 215 bool wxButton::SendClickEvent()
 216 {
 217     wxCommandEvent event(wxEVT_COMMAND_BUTTON_CLICKED, GetId());
 218     event.SetEventObject(this);
 219
 220     return ProcessCommand(event);
 221 }
 222
 223 void wxButton::Command(wxCommandEvent & event)
 224 {
 225     ProcessCommand(event);
 226 }
 227
 228 // ----------------------------------------------------------------------------
 229 // event/message handlers
 230 // ----------------------------------------------------------------------------
 231
 232 bool wxButton::MSWCommand(WXUINT param, WXWORD id)
 233 {
 234     bool processed = FALSE;
 235     switch ( param )
 236     {
 237         case 1:                                             // 1 for accelerator
 238         case BN_CLICKED:
 239             processed = SendClickEvent();
 240             break;
 241     }
 242
 243     return processed;
 244 }
 245
 246 WXHBRUSH wxButton::OnCtlColor(WXHDC pDC,
 247                               WXHWND pWnd,
 248                               WXUINT nCtlColor,
 249                               WXUINT message,
 250                               WXWPARAM wParam,
 251                               WXLPARAM lParam)
 252 {
 253   wxBrush *backgroundBrush = wxTheBrushList->FindOrCreateBrush(GetBackgroundColour(), wxSOLID);
 254
 255   return (WXHBRUSH) backgroundBrush->GetResourceHandle();
 256 }
 257