From 632e5093093c6bcc8f791001e8d93436e712c1aa Mon Sep 17 00:00:00 2001
From: Vadim Zeitlin <vadim@wxwidgets.org>
Date: Sun, 20 May 2012 20:29:35 +0000
Subject: [PATCH] Improve check for OS X version in Cocoa wxFileDialog
 implementation.

A library using wxWidgets linked with 10.6 SDK might be loaded into an
application loading 10.5 version of AppKit in which case 10.6-specific
functions shouldn't be used. Check for the AppKit version effectively in use
instead of just checking for the system version.

Closes #13831.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@71515 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
---
 src/osx/cocoa/filedlg.mm | 34 ++++++++++++++++++++++++++++++++--
 1 file changed, 32 insertions(+), 2 deletions(-)

diff --git a/src/osx/cocoa/filedlg.mm b/src/osx/cocoa/filedlg.mm
index e026bc744e..0ab62f5bfa 100644
--- a/src/osx/cocoa/filedlg.mm
+++ b/src/osx/cocoa/filedlg.mm
@@ -38,6 +38,8 @@
 #include "wx/osx/private.h"
 #include "wx/sysopt.h"
 
+#include <mach-o/dyld.h>
+
 // ============================================================================
 // implementation
 // ============================================================================
@@ -49,6 +51,34 @@
 // then the delegate method - (BOOL)panel:(id)sender shouldShowFilename:(NSString *)filename will have to
 // be implemented
 
+namespace
+{
+
+bool HasAppKit_10_6()
+{
+    // Even if we require 10.6, we might be loaded by an application that
+    // was linked against 10.5.  setAllowedFileTypes will still be ignored
+    // in this case.  From NSSavePanel.h:
+    // NSOpenPanel: On versions less than 10.6, this property is ignored.
+    // For applications that link against 10.6 and higher, this property will
+    // determine which files should be enabled in the open panel.
+    int32_t version = NSVersionOfLinkTimeLibrary("AppKit");
+    if (version == -1)
+    {
+        // If we're loaded by an application that doesn't link against AppKit,
+        // use the runtime version instead.  This check will not work for the
+        // case above.
+        version = NSVersionOfRunTimeLibrary("AppKit");
+    }
+    if (version == -1)
+    {
+        return false;
+    }
+    return version >= 0x40e2400 /* version of 10.6 AppKit */;
+}
+
+} // anonymous namespace
+
 @interface wxOpenPanelDelegate : NSObject wxOSX_10_6_AND_LATER(<NSOpenSavePanelDelegate>)
 {
     wxFileDialog* _dialog;
@@ -436,7 +466,7 @@ void wxFileDialog::SetupExtraControls(WXWindow nativeWindow)
         accView = m_filterPanel->GetHandle();
         if( HasFlag(wxFD_OPEN) )
         {
-            if ( UMAGetSystemVersion() < 0x1060 )
+            if ( UMAGetSystemVersion() < 0x1060 || !HasAppKit_10_6() )
             {
                 wxOpenPanelDelegate* del = [[wxOpenPanelDelegate alloc]init];
                 [del setFileDialog:this];
@@ -586,7 +616,7 @@ int wxFileDialog::ShowModal()
         [oPanel setAllowsMultipleSelection: (HasFlag(wxFD_MULTIPLE) ? YES : NO )];
 
 #if MAC_OS_X_VERSION_MAX_ALLOWED >= 1060
-        if ( UMAGetSystemVersion() >= 0x1060 )
+        if ( UMAGetSystemVersion() >= 0x1060 && HasAppKit_10_6() )
         {
             [oPanel setAllowedFileTypes: (m_delegate == nil ? types : nil)];
             if ( !m_dir.IsEmpty() )
-- 
2.45.2