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     SetValidator(validator);
  74
  75     parent->AddChild((wxButton *)this);
  76
  77     m_backgroundColour = parent->GetBackgroundColour() ;
  78     m_foregroundColour = parent->GetForegroundColour() ;
  79
  80     m_hWnd = (WXHWND)CreateWindowEx
  81                      (
  82                       MakeExtendedStyle(m_windowStyle),
  83                       _T("BUTTON"),
  84                       label,
  85                       WS_VISIBLE | WS_TABSTOP | WS_CHILD,
  86                       0, 0, 0, 0,
  87                       GetWinHwnd(parent),
  88                       (HMENU)m_windowId,
  89                       wxGetInstance(),
  90                       NULL
  91                      );
  92
  93     // Subclass again for purposes of dialog editing mode
  94     SubclassWin(m_hWnd);
  95
  96     SetFont(parent->GetFont());
  97
  98     SetSize(pos.x, pos.y, size.x, size.y);
  99
 100     return TRUE;
 101 }
 102
 103 wxButton::~wxButton()
 104 {
 105     wxPanel *panel = wxDynamicCast(GetParent(), wxPanel);
 106     if ( panel )
 107     {
 108         if ( panel->GetDefaultItem() == this )
 109         {
 110             // don't leave the panel with invalid default item
 111             panel->SetDefaultItem(NULL);
 112         }
 113     }
 114 }
 115
 116 // ----------------------------------------------------------------------------
 117 // size management including autosizing
 118 // ----------------------------------------------------------------------------
 119
 120 wxSize wxButton::DoGetBestSize()
 121 {
 122     wxString label = wxGetWindowText(GetHWND());
 123     int wBtn;
 124     GetTextExtent(label, &wBtn, NULL);
 125
 126     int wChar, hChar;
 127     wxGetCharSize(GetHWND(), &wChar, &hChar, &GetFont());
 128
 129     // add a margin - the button is wider than just its label
 130     wBtn += 3*wChar;
 131
 132     // the button height is proportional to the height of the font used
 133     int hBtn = BUTTON_HEIGHT_FROM_CHAR_HEIGHT(hChar);
 134
 135     return wxSize(wBtn, hBtn);
 136 }
 137
 138 /* static */
 139 wxSize wxButton::GetDefaultSize()
 140 {
 141     static wxSize s_sizeBtn;
 142
 143     if ( s_sizeBtn.x == 0 )
 144     {
 145         wxScreenDC dc;
 146         dc.SetFont(wxSystemSettings::GetSystemFont(wxSYS_DEFAULT_GUI_FONT));
 147
 148         // the size of a standard button in the dialog units is 50x14,
 149         // translate this to pixels
 150         // NB1: the multipliers come from the Windows convention
 151         // NB2: the extra +1/+2 were needed to get the size be the same as the
 152         //      size of the buttons in the standard dialog - I don't know how
 153         //      this happens, but on my system this size is 75x23 in pixels and
 154         //      23*8 isn't even divisible by 14... Would be nice to understand
 155         //      why these constants are needed though!
 156         s_sizeBtn.x = (50 * (dc.GetCharWidth() + 1))/4;
 157         s_sizeBtn.y = ((14 * dc.GetCharHeight()) + 2)/8;
 158     }
 159
 160     return s_sizeBtn;
 161 }
 162
 163 // ----------------------------------------------------------------------------
 164 // set this button as the default one in its panel
 165 // ----------------------------------------------------------------------------
 166
 167 void wxButton::SetDefault()
 168 {
 169     wxWindow *parent = GetParent();
 170     wxButton *btnOldDefault = NULL;
 171     wxPanel *panel = wxDynamicCast(parent, wxPanel);
 172     if ( panel )
 173     {
 174         btnOldDefault = panel->GetDefaultItem();
 175         panel->SetDefaultItem(this);
 176     }
 177
 178     if ( parent )
 179     {
 180         SendMessage(GetWinHwnd(parent), DM_SETDEFID, m_windowId, 0L);
 181     }
 182
 183     // this doesn't work with bitmap buttons because it also removes the
 184     // "ownerdrawn" style...
 185     if ( btnOldDefault && !wxDynamicCast(btnOldDefault, wxBitmapButton) )
 186     {
 187         // remove the BS_DEFPUSHBUTTON style from the other button
 188         long style = GetWindowLong(GetHwndOf(btnOldDefault), GWL_STYLE);
 189         style &= ~BS_DEFPUSHBUTTON;
 190         SendMessage(GetHwndOf(btnOldDefault), BM_SETSTYLE, style, 1L);
 191     }
 192
 193     // set this button as the default
 194     long style = GetWindowLong(GetHwnd(), GWL_STYLE);
 195     style |= BS_DEFPUSHBUTTON;
 196     SendMessage(GetHwnd(), BM_SETSTYLE, style, 1L);
 197 }
 198
 199 // ----------------------------------------------------------------------------
 200 // helpers
 201 // ----------------------------------------------------------------------------
 202
 203 bool wxButton::SendClickEvent()
 204 {
 205     wxCommandEvent event(wxEVT_COMMAND_BUTTON_CLICKED, GetId());
 206     event.SetEventObject(this);
 207
 208     return ProcessCommand(event);
 209 }
 210
 211 void wxButton::Command(wxCommandEvent & event)
 212 {
 213     ProcessCommand(event);
 214 }
 215
 216 // ----------------------------------------------------------------------------
 217 // event/message handlers
 218 // ----------------------------------------------------------------------------
 219
 220 bool wxButton::MSWCommand(WXUINT param, WXWORD id)
 221 {
 222     bool processed = FALSE;
 223     switch ( param )
 224     {
 225         case 1:                                             // 1 for accelerator
 226         case BN_CLICKED:
 227             processed = SendClickEvent();
 228             break;
 229     }
 230
 231     return processed;
 232 }
 233
 234 WXHBRUSH wxButton::OnCtlColor(WXHDC pDC,
 235                               WXHWND pWnd,
 236                               WXUINT nCtlColor,
 237                               WXUINT message,
 238                               WXWPARAM wParam,
 239                               WXLPARAM lParam)
 240 {
 241   wxBrush *backgroundBrush = wxTheBrushList->FindOrCreateBrush(GetBackgroundColour(), wxSOLID);
 242
 243   return (WXHBRUSH) backgroundBrush->GetResourceHandle();
 244 }
 245