X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/8292017ce0c67bc3c759d7c681a690b6c493150e..7e25f59e48c3ee93fcb54aa7fca1fd51628c2fac:/src/msw/button.cpp

diff --git a/src/msw/button.cpp b/src/msw/button.cpp
index 2cafeca17e..cb5cce446f 100644
--- a/src/msw/button.cpp
+++ b/src/msw/button.cpp
@@ -180,36 +180,99 @@ wxSize wxButtonBase::GetDefaultSize()
 }
 
 // ----------------------------------------------------------------------------
-// set this button as the default one in its panel
+// default button handling
 // ----------------------------------------------------------------------------
 
+/*
+   "Everything you ever wanted to know about the default buttons" or "Why do we
+   have to do all this?"
+
+   In MSW the default button should be activated when the user presses Enter
+   and the current control doesn't process Enter itself somehow. This is
+   handled by ::DefWindowProc() (or maybe ::DefDialogProc()) using DM_SETDEFID
+   Another aspect of "defaultness" is that the default button has different
+   appearance: this is due to BS_DEFPUSHBUTTON style which is completely
+   separate from DM_SETDEFID stuff (!).
+
+   Final complication is that when a button is active, it should be the default
+   one, i.e. pressing Enter on a button always activates it and not another
+   one.
+
+   We handle this by maintaining a permanent and a temporary default items in
+   wxControlContainer (both may be NULL). When a button becomes the current
+   control (i.e. gets focus) it sets itself as the temporary default which
+   ensures that it has the right appearance and that Enter will be redirected
+   to it. When the button loses focus, it unsets the temporary default and so
+   the default item will be the permanent default -- that is the default button
+   if any had been set or none otherwise, which is just what we want.
+
+   Remark that we probably don't need to send DM_SETDEFID as we don't use
+   ::IsDialogMessage() (which relies on it) any longer but OTOH it probably
+   doesn't hurt neither.
+ */
+
+// set this button as the (permanently) default one in its panel
 void wxButton::SetDefault()
 {
     wxWindow *parent = GetParent();
-    wxButton *btnOldDefault;
-    if ( parent )
-    {
-        wxWindow *winOldDefault = parent->SetDefaultItem(this);
-        btnOldDefault = wxDynamicCast(winOldDefault, wxButton);
 
-        ::SendMessage(GetWinHwnd(parent), DM_SETDEFID, m_windowId, 0L);
+    wxCHECK_RET( parent, _T("button without parent?") );
+
+    // set this one as the default button both for wxWindows and Windows
+    wxWindow *winOldDefault = parent->SetDefaultItem(this);
+    ::SendMessage(GetWinHwnd(parent), DM_SETDEFID, m_windowId, 0L);
+
+    UpdateDefaultStyle(this, winOldDefault);
+}
+
+void wxButton::SetTmpDefault()
+{
+    wxWindow *parent = GetParent();
+
+    wxCHECK_RET( parent, _T("button without parent?") );
+
+    wxWindow *winOldDefault = parent->GetDefaultItem();
+    parent->SetTmpDefaultItem(this);
+    if ( winOldDefault != this )
+    {
+        UpdateDefaultStyle(this, winOldDefault);
     }
-    else // is a button without parent really normal?
+    //else: no styles to update
+}
+
+void wxButton::UnsetTmpDefault()
+{
+    wxWindow *parent = GetParent();
+
+    wxCHECK_RET( parent, _T("button without parent?") );
+
+    parent->SetTmpDefaultItem(NULL);
+
+    wxWindow *winOldDefault = parent->GetDefaultItem();
+    if ( winOldDefault != this )
     {
-        btnOldDefault = NULL;
+        UpdateDefaultStyle(winOldDefault, this);
     }
+    //else: we had been default before anyhow
+}
 
-    if ( btnOldDefault && btnOldDefault != this )
+/* static */
+void
+wxButton::UpdateDefaultStyle(wxWindow *winDefault, wxWindow *winOldDefault)
+{
+    // clear the BS_DEFPUSHBUTTON for the old default button
+    wxButton *btnOldDefault = wxDynamicCast(winOldDefault, wxButton);
+    if ( btnOldDefault && btnOldDefault != winDefault )
     {
         // remove the BS_DEFPUSHBUTTON style from the other button
-        long style = GetWindowLong(GetHwndOf(btnOldDefault), GWL_STYLE);
+        long style = ::GetWindowLong(GetHwndOf(btnOldDefault), GWL_STYLE);
 
         // don't do it with the owner drawn buttons because it will reset
         // BS_OWNERDRAW style bit too (BS_OWNERDRAW & BS_DEFPUSHBUTTON != 0)!
         if ( (style & BS_OWNERDRAW) != BS_OWNERDRAW )
         {
             style &= ~BS_DEFPUSHBUTTON;
-            SendMessage(GetHwndOf(btnOldDefault), BM_SETSTYLE, style, 1L);
+            ::SendMessage(GetHwndOf(btnOldDefault), BM_SETSTYLE, style, 1L);
         }
         else
         {
@@ -219,12 +282,20 @@ void wxButton::SetDefault()
         }
     }
 
-    // set this button as the default
-    long style = GetWindowLong(GetHwnd(), GWL_STYLE);
-    if ( (style & BS_OWNERDRAW) != BS_OWNERDRAW )
+    // and set BS_DEFPUSHBUTTON for this button
+    wxButton *btnDefault = wxDynamicCast(winDefault, wxButton);
+    if ( btnDefault )
     {
-        style |= BS_DEFPUSHBUTTON;
-        SendMessage(GetHwnd(), BM_SETSTYLE, style, 1L);
+        long style = ::GetWindowLong(GetHwndOf(btnDefault), GWL_STYLE);
+        if ( (style & BS_OWNERDRAW) != BS_OWNERDRAW )
+        {
+            style |= BS_DEFPUSHBUTTON;
+            ::SendMessage(GetHwndOf(btnDefault), BM_SETSTYLE, style, 1L);
+        }
+        else
+        {
+            btnDefault->Refresh();
+        }
     }
 }
 
@@ -266,13 +337,18 @@ bool wxButton::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 
 long wxButton::MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam)
 {
-    // when we receive focus, we want to become the default button in our
-    // parent panel
+    // when we receive focus, we want to temporary become the default button in
+    // our parent panel so that pressing "Enter" would activate us -- and when
+    // losing it we should restore the previous default button as well
     if ( nMsg == WM_SETFOCUS )
     {
-        SetDefault();
+        SetTmpDefault();
 
-        // let the default processign take place too
+        // let the default processing take place too
+    }
+    else if ( nMsg == WM_KILLFOCUS )
+    {
+        UnsetTmpDefault();
     }
     else if ( nMsg == WM_LBUTTONDBLCLK )
     {
@@ -280,7 +356,7 @@ long wxButton::MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam)
         // appearance - without this, it won't do it
         (void)wxControl::MSWWindowProc(WM_LBUTTONDOWN, wParam, lParam);
 
-        // and conitnue with processing the message normally as well
+        // and continue with processing the message normally as well
     }
 
     // let the base class do all real processing