Q: Why isn't my edit text box in my Navigation dialog's custom area working on 10.3? A: Navigation Services dialogs are now compositing on Mac OS X 10.3. The NavCustomControl / kNavCtlAddControl call now adds (or moves) the control or HIView in the dialog's control list. Previously, the control had to be in the control list already.
Due to a bug, which will be fixed, this NavCustomControl call mishandles the Edit Text control if it was already in the control list. The symptoms are an empty box (even if a string was provided at creation) which doesn't accept typed characters even when the edit box has the focus. There is a simple workaround to this bug which is given below.
Thus, the code which was correct previously:
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Listing 1. Previous Code.
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CreateEditUnicodeTextControl(callBackParms->window, &bounds,
CFSTR("Some Text"), false, NULL, &editText);
NavCustomControl(callBackParms->context, kNavCtlAddControl, editText);
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should be changed, for Mac OS X 10.3, into:
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Listing 2. New Code.
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CreateEditUnicodeTextControl(NULL, &bounds,
CFSTR("Some Text"), false, NULL, &editText);
NavCustomControl(callBackParms->context, kNavCtlAddControl, editText);
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You may add a check for the version this way:
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Listing 3. Checking HIToolbox version.
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WindowRef inWindow;
if (GetHIToolboxVersion() < 0x130)
inWindow = callBackParms->window;
else
inWindow = NULL;
CreateEditUnicodeTextControl(inWindow, &bounds,
CFSTR("Some Text"), false, NULL, &editText);
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And you can use the following code to retrieve the HIToolbox version:
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Listing 4. Retrieving HIToolbox version.
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UInt32 GetHIToolboxVersion()
{
CFBundleRef bundle;
CFStringRef versStr = NULL;
static UInt32 version = 0;
// let's do the heavy following code only once...
if (version != 0) return version;
bundle = CFBundleGetBundleWithIdentifier(CFSTR("com.apple.HIToolbox"));
if ( bundle != NULL )
versStr = (CFStringRef)CFBundleGetValueForInfoDictionaryKey(bundle,
CFSTR("CFBundleShortVersionString"));
if ( versStr != NULL &&
CFGetTypeID(versStr) == CFStringGetTypeID())
{
int major = 0, minor = 0, bugfix = 0;
char sz[20];
CFStringGetCString(versStr, sz, sizeof(sz), kCFStringEncodingUTF8);
sscanf(sz, "%d.%d.%d", &major, &minor, &bugfix);
version = ( major << 8 ) + ( minor << 4 ) + bugfix;
}
return version;
}
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After the bug is fixed, once again enabling the use of callBackParms->window as first parameter of the CreateEditUnicodeTextControl call, the workaround of passing NULL as first parameter will also still work as expected on Mac OS X 10.3 and later.
[Oct 28, 2003]
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