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 #endif
  35
  36 #include "wx/msw/private.h"
  37
  38 // ----------------------------------------------------------------------------
  39 // macros
  40 // ----------------------------------------------------------------------------
  41
  42 #if !USE_SHARED_LIBRARY
  43     IMPLEMENT_DYNAMIC_CLASS(wxButton, wxControl)
  44 #endif
  45
  46 // this macro tries to adjust the default button height to a reasonable value
  47 // using the char height as the base
  48 #define BUTTON_HEIGHT_FROM_CHAR_HEIGHT(cy) (11*EDIT_HEIGHT_FROM_CHAR_HEIGHT(cy)/10)
  49
  50 // ============================================================================
  51 // implementation
  52 // ============================================================================
  53
  54 // ----------------------------------------------------------------------------
  55 // creation/destruction
  56 // ----------------------------------------------------------------------------
  57
  58 bool wxButton::Create(wxWindow *parent,
  59                       wxWindowID id,
  60                       const wxString& label,
  61                       const wxPoint& pos,
  62                       const wxSize& size,
  63                       long style,
  64                       const wxValidator& validator,
  65                       const wxString& name)
  66 {
  67     if ( !CreateBase(parent, id, pos, size, style, name) )
  68         return FALSE;
  69
  70     SetValidator(validator);
  71
  72     parent->AddChild((wxButton *)this);
  73
  74     m_backgroundColour = parent->GetBackgroundColour() ;
  75     m_foregroundColour = parent->GetForegroundColour() ;
  76
  77     m_hWnd = (WXHWND)CreateWindowEx
  78                      (
  79                       MakeExtendedStyle(m_windowStyle),
  80                       _T("BUTTON"),
  81                       label,
  82                       WS_VISIBLE | WS_TABSTOP | WS_CHILD,
  83                       0, 0, 0, 0,
  84                       GetWinHwnd(parent),
  85                       (HMENU)m_windowId,
  86                       wxGetInstance(),
  87                       NULL
  88                      );
  89
  90     // Subclass again for purposes of dialog editing mode
  91     SubclassWin(m_hWnd);
  92
  93     SetFont(parent->GetFont());
  94
  95     SetSize(pos.x, pos.y, size.x, size.y);
  96
  97     return TRUE;
  98 }
  99
 100 wxButton::~wxButton()
 101 {
 102     wxPanel *panel = wxDynamicCast(GetParent(), wxPanel);
 103     if ( panel )
 104     {
 105         if ( panel->GetDefaultItem() == this )
 106         {
 107             // don't leave the panel with invalid default item
 108             panel->SetDefaultItem(NULL);
 109         }
 110     }
 111 }
 112
 113 // ----------------------------------------------------------------------------
 114 // size management including autosizing
 115 // ----------------------------------------------------------------------------
 116
 117 wxSize wxButton::DoGetBestSize()
 118 {
 119     wxString label = wxGetWindowText(GetHWND());
 120     int wBtn;
 121     GetTextExtent(label, &wBtn, NULL);
 122
 123     int wChar, hChar;
 124     wxGetCharSize(GetHWND(), &wChar, &hChar, &GetFont());
 125
 126     // add a margin - the button is wider than just its label
 127     wBtn += 3*wChar;
 128
 129     // the button height is proportional to the height of the font used
 130     int hBtn = BUTTON_HEIGHT_FROM_CHAR_HEIGHT(hChar);
 131
 132     return wxSize(wBtn, hBtn);
 133 }
 134
 135 /* static */
 136 wxSize wxButton::GetDefaultSize()
 137 {
 138     // the base unit is the height of the system GUI font
 139     int wChar, hChar;
 140     wxGetCharSize(0, &wChar, &hChar, NULL);
 141
 142     // the button height is proportional to the height of the font used
 143     int hBtn = BUTTON_HEIGHT_FROM_CHAR_HEIGHT(hChar);
 144
 145     // and the width/height ration is 75/23
 146     return wxSize((75 * hBtn) / 23, hBtn);
 147 }
 148
 149 // ----------------------------------------------------------------------------
 150 // set this button as the default one in its panel
 151 // ----------------------------------------------------------------------------
 152
 153 void wxButton::SetDefault()
 154 {
 155     wxWindow *parent = GetParent();
 156     wxButton *btnOldDefault = NULL;
 157     wxPanel *panel = wxDynamicCast(parent, wxPanel);
 158     if ( panel )
 159     {
 160         btnOldDefault = panel->GetDefaultItem();
 161         panel->SetDefaultItem(this);
 162     }
 163
 164     if ( parent )
 165     {
 166         SendMessage(GetWinHwnd(parent), DM_SETDEFID, m_windowId, 0L);
 167     }
 168
 169     if ( btnOldDefault )
 170     {
 171         // remove the BS_DEFPUSHBUTTON style from the other button
 172         long style = GetWindowLong(GetHwndOf(btnOldDefault), GWL_STYLE);
 173         style &= ~BS_DEFPUSHBUTTON;
 174         SendMessage(GetHwndOf(btnOldDefault), BM_SETSTYLE, style, 1L);
 175     }
 176
 177     // set this button as the default
 178     long style = GetWindowLong(GetHwnd(), GWL_STYLE);
 179     style |= BS_DEFPUSHBUTTON;
 180     SendMessage(GetHwnd(), BM_SETSTYLE, style, 1L);
 181 }
 182
 183 // ----------------------------------------------------------------------------
 184 // helpers
 185 // ----------------------------------------------------------------------------
 186
 187 bool wxButton::SendClickEvent()
 188 {
 189     wxCommandEvent event(wxEVT_COMMAND_BUTTON_CLICKED, GetId());
 190     event.SetEventObject(this);
 191
 192     return ProcessCommand(event);
 193 }
 194
 195 void wxButton::Command(wxCommandEvent & event)
 196 {
 197     ProcessCommand(event);
 198 }
 199
 200 // ----------------------------------------------------------------------------
 201 // event/message handlers
 202 // ----------------------------------------------------------------------------
 203
 204 bool wxButton::MSWCommand(WXUINT param, WXWORD id)
 205 {
 206     bool processed = FALSE;
 207     switch ( param )
 208     {
 209         case 1:                                             // 1 for accelerator
 210         case BN_CLICKED:
 211             processed = SendClickEvent();
 212             break;
 213     }
 214
 215     return processed;
 216 }
 217
 218 WXHBRUSH wxButton::OnCtlColor(WXHDC pDC,
 219                               WXHWND pWnd,
 220                               WXUINT nCtlColor,
 221                               WXUINT message,
 222                               WXWPARAM wParam,
 223                               WXLPARAM lParam)
 224 {
 225   wxBrush *backgroundBrush = wxTheBrushList->FindOrCreateBrush(GetBackgroundColour(), wxSOLID);
 226
 227   return (WXHBRUSH) backgroundBrush->GetResourceHandle();
 228 }
 229