include/wx/msw/private/button.h

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        msw/private/button.h
   3 // Purpose:     helper functions used with native BUTTON control
   4 // Author:      Vadim Zeitlin
   5 // Created:     2008-06-07
   6 // RCS-ID:      $Id$
   7 // Copyright:   (c) 2008 Vadim Zeitlin <vadim@wxwidgets.org>
   8 // Licence:     wxWindows licence
   9 ///////////////////////////////////////////////////////////////////////////////
  10
  11 #ifndef _WX_MSW_PRIVATE_BUTTON_H_
  12 #define _WX_MSW_PRIVATE_BUTTON_H_
  13
  14 // define some standard button constants which may be missing in the headers
  15 #ifndef BS_PUSHLIKE
  16     #define BS_PUSHLIKE 0x00001000L
  17 #endif
  18
  19 #ifndef BST_UNCHECKED
  20     #define BST_UNCHECKED 0x0000
  21 #endif
  22
  23 #ifndef BST_CHECKED
  24     #define BST_CHECKED 0x0001
  25 #endif
  26
  27 #ifndef BST_INDETERMINATE
  28     #define BST_INDETERMINATE 0x0002
  29 #endif
  30
  31 #ifndef DT_HIDEPREFIX
  32     #define DT_HIDEPREFIX 0x00100000
  33 #endif
  34
  35 namespace wxMSWButton
  36 {
  37
  38 // returns BS_MULTILINE if the label contains new lines or 0 otherwise
  39 inline int GetMultilineStyle(const wxString& label)
  40 {
  41     return label.find(_T('\n')) == wxString::npos ? 0 : BS_MULTILINE;
  42 }
  43
  44 // update the style of the specified HWND to include or exclude BS_MULTILINE
  45 // depending on whether the label contains the new lines
  46 inline void UpdateMultilineStyle(HWND hwnd, const wxString& label)
  47 {
  48     // update BS_MULTILINE style depending on the new label (resetting it
  49     // doesn't seem to do anything very useful but it shouldn't hurt and we do
  50     // have to set it whenever the label becomes multi line as otherwise it
  51     // wouldn't be shown correctly as we don't use BS_MULTILINE when creating
  52     // the control unless it already has new lines in its label)
  53     long styleOld = ::GetWindowLong(hwnd, GWL_STYLE),
  54          styleNew;
  55     if ( label.find(_T('\n')) != wxString::npos )
  56         styleNew = styleOld | BS_MULTILINE;
  57     else
  58         styleNew = styleOld & ~BS_MULTILINE;
  59
  60     if ( styleNew != styleOld )
  61         ::SetWindowLong(hwnd, GWL_STYLE, styleNew);
  62 }
  63
  64 // common implementation of wxButton and wxToggleButton::DoGetBestSize()
  65 inline wxSize ComputeBestSize(wxControl *btn)
  66 {
  67     wxClientDC dc(btn);
  68
  69     wxCoord wBtn,
  70             hBtn;
  71     dc.GetMultiLineTextExtent(btn->GetLabelText(), &wBtn, &hBtn);
  72
  73     // FIXME: this is pure guesswork, need to retrieve the real button margins
  74     wBtn += 3*btn->GetCharWidth();
  75     hBtn = 11*EDIT_HEIGHT_FROM_CHAR_HEIGHT(hBtn)/10;
  76
  77     // all buttons have at least the standard size unless the user explicitly
  78     // wants them to be of smaller size and used wxBU_EXACTFIT style when
  79     // creating the button
  80     if ( !btn->HasFlag(wxBU_EXACTFIT) )
  81     {
  82         wxSize sz = wxButton::GetDefaultSize();
  83         if ( wBtn < sz.x )
  84             wBtn = sz.x;
  85         if ( hBtn < sz.y )
  86             hBtn = sz.y;
  87     }
  88
  89     wxSize best(wBtn, hBtn);
  90     btn->CacheBestSize(best);
  91     return best;
  92 }
  93
  94 } // namespace wxMSWButton
  95
  96 #endif // _WX_MSW_PRIVATE_BUTTON_H_
  97