Added machinery to Enable/Disable windows. When a window is disabled, it

disables all of its children.  Every window maintains a bool indicating
whether it should be enabled (i.e. Enable() was called on it directly).
When a window is reenabled, it reenables children, but only if they are
actually supposed to be enabled. Override CocoaSetEnabled() in subclasses
to actually enable/disable a Cocoa control.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@23014 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/cocoa/window.mm

@@ -202,6 +202,7 @@ void wxWindowCocoa::Init()
     m_cocoaScroller = NULL;
     m_isBeingDeleted = FALSE;
     m_isInPaint = FALSE;
+    m_shouldBeEnabled = true;
 }
 
 // Constructor
@@ -416,6 +417,34 @@ void wxWindow::CocoaReplaceView(WX_NSView oldView, WX_NSView newView)
     [[oldView superview] replaceSubview:oldView with:newView];
 }
 
+bool wxWindow::EnableSelfAndChildren(bool enable)
+{
+    // If the state isn't changing, don't do anything
+    if(!wxWindowBase::Enable(enable && m_shouldBeEnabled))
+        return false;
+    // Set the state of the Cocoa window
+    CocoaSetEnabled(m_isEnabled);
+    // Disable all children or (if enabling) return them to their proper state
+    for(wxWindowList::compatibility_iterator node = GetChildren().GetFirst();
+        node; node = node->GetNext())
+    {
+        node->GetData()->EnableSelfAndChildren(enable);
+    }
+    return true;
+}
+
+bool wxWindow::Enable(bool enable)
+{
+    // Keep track of what the window SHOULD be doing
+    m_shouldBeEnabled = enable;
+    // If the parent is disabled for any reason, then this window will be too.
+    if(!IsTopLevel() && GetParent())
+    {
+        enable = enable && GetParent()->IsEnabled();
+    }
+    return EnableSelfAndChildren(enable);
+}
+
 bool wxWindow::Show(bool show)
 {
     wxAutoNSAutoreleasePool pool;