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