Add wxDC::GetFontMetrics() and implement it for wxMSW.

[wxWidgets.git] / include / wx / msw / private / button.h

diff --git a/include/wx/msw/private/button.h b/include/wx/msw/private/button.h
index 97b6de86c0e3ed345cc6e685d62e742de407f38d..a6c9b64374dfc4a5905dc726be363ca4fbfacd92 100644 (file)
--- a/include/wx/msw/private/button.h
+++ b/include/wx/msw/private/button.h
@@ -28,67 +28,46 @@
     #define BST_INDETERMINATE 0x0002
 #endif
 
-#ifndef DT_HIDEPREFIX
-    #define DT_HIDEPREFIX 0x00100000
-#endif
-
 namespace wxMSWButton
 {
 
 // returns BS_MULTILINE if the label contains new lines or 0 otherwise
 inline int GetMultilineStyle(const wxString& label)
 {
-    return label.find(_T('\n')) == wxString::npos ? 0 : BS_MULTILINE;
+    return label.find(wxT('\n')) == wxString::npos ? 0 : BS_MULTILINE;
 }
 
 // update the style of the specified HWND to include or exclude BS_MULTILINE
 // depending on whether the label contains the new lines
-inline void UpdateMultilineStyle(HWND hwnd, const wxString& label)
+void UpdateMultilineStyle(HWND hwnd, const wxString& label);
+
+// flags for ComputeBestSize() and GetFittingSize()
+enum
 {
-    // update BS_MULTILINE style depending on the new label (resetting it
-    // doesn't seem to do anything very useful but it shouldn't hurt and we do
-    // have to set it whenever the label becomes multi line as otherwise it
-    // wouldn't be shown correctly as we don't use BS_MULTILINE when creating
-    // the control unless it already has new lines in its label)
-    long styleOld = ::GetWindowLong(hwnd, GWL_STYLE),
-         styleNew;
-    if ( label.find(_T('\n')) != wxString::npos )
-        styleNew = styleOld | BS_MULTILINE;
-    else
-        styleNew = styleOld & ~BS_MULTILINE;
-
-    if ( styleNew != styleOld )
-        ::SetWindowLong(hwnd, GWL_STYLE, styleNew);
-}
+    Size_AuthNeeded = 1
+};
+
+// NB: All the functions below are implemented in src/msw/button.cpp
+
+// Compute the button size (as if wxBU_EXACTFIT were specified, i.e. without
+// adjusting it to be of default size if it's smaller) for the given label size
+WXDLLIMPEXP_CORE wxSize
+GetFittingSize(wxWindow *win, const wxSize& sizeLabel, int flags = 0);
+
+// Compute the button size (as if wxBU_EXACTFIT were specified) by computing
+// its label size and then calling GetFittingSize().
+wxSize ComputeBestFittingSize(wxControl *btn, int flags = 0);
+
+// Increase the size passed as parameter to be at least the standard button
+// size if the control doesn't have wxBU_EXACTFIT style and also cache it as
+// the best size and return its value -- this is used in DoGetBestSize()
+// implementation.
+wxSize IncreaseToStdSizeAndCache(wxControl *btn, const wxSize& size);
 
-// common implementation of wxButton and wxToggleButton::DoGetBestSize()
-inline wxSize ComputeBestSize(wxControl *btn)
+// helper of wxToggleButton::DoGetBestSize()
+inline wxSize ComputeBestSize(wxControl *btn, int flags = 0)
 {
-    wxClientDC dc(btn);
-
-    wxCoord wBtn,
-            hBtn;
-    dc.GetMultiLineTextExtent(btn->GetLabelText(), &wBtn, &hBtn);
-
-    // FIXME: this is pure guesswork, need to retrieve the real button margins
-    wBtn += 3*btn->GetCharWidth();
-    hBtn = 11*EDIT_HEIGHT_FROM_CHAR_HEIGHT(hBtn)/10;
-
-    // all buttons have at least the standard size unless the user explicitly
-    // wants them to be of smaller size and used wxBU_EXACTFIT style when
-    // creating the button
-    if ( !btn->HasFlag(wxBU_EXACTFIT) )
-    {
-        wxSize sz = wxButton::GetDefaultSize();
-        if ( wBtn < sz.x )
-            wBtn = sz.x;
-        if ( hBtn < sz.y )
-            hBtn = sz.y;
-    }
-
-    wxSize best(wBtn, hBtn);
-    btn->CacheBestSize(best);
-    return best;
+    return IncreaseToStdSizeAndCache(btn, ComputeBestFittingSize(btn, flags));
 }
 
 } // namespace wxMSWButton