Carolyn, Would it then be easier for Accprobe to have an additional parameter for IAccessibleValue::setAccessibleValue method to specify the type of the value? I can change the value parameter type back to object instead of string.
Kavitha Teegala IBM Human Ability and Accessibility Center Austin, TX teeg...@us.ibm.com From: Richard Schwerdtfeger/Austin/i...@ibmus To: Carolyn MacLeod <carolyn_macl...@ca.ibm.com> Cc: accessibility-...@lists.linux-foundation.org, accessibility-ia2-boun...@lists.linuxfoundation.org Date: 04/28/2010 08:27 AM Subject: Re: [Accessibility-ia2] IAccessibleValue VARIANT types -- not BSTR please Car, Value should not be a string. If there is a text equivalent it can be sent through the object properties. I had asked that the Firefox properties from aria, which allows for a text equivalent, become standard object properties. For example, a slider may have 7 days of the week and the current value is 1 for Monday. The text equivalent would be Monday. I strongly support that the value not be a BSTR. Rich Schwerdtfeger CTO Accessibility Software Group Carolyn MacLeod ---04/27/2010 11:42:57 PM---The following item was discussed on the April 28 call: http://www.linuxfoundation.org/en/Accessibility/IAccessible2/Minutes/2 Carolyn MacLeod <carolyn_macl...@ca.ibm.com> Sent by: accessibility-ia2-boun...@lists.linuxfoundation.org 04/27/2010 11:38 PM To accessibility-...@lists.linux-foundation.org cc Subject [Accessibility-ia2] IAccessibleValue VARIANT types -- not BSTR please The following item was discussed on the April 28 call: http://www.linuxfoundation.org/en/Accessibility/IAccessible2/Minutes/20090428 11.Types for IAValue Should the VARIANT types for IAValue be limited to VT_I4 and VT_BSTR? - It was felt other numerics, especially floats, such at VT_R8 (double) should also be allowed. - For next time: Is VT_I4, VT_R8, and VT_BSTR sufficient? (There is also VT_I8 to consider.) - It was also felt that if the current value is a numeric then the min and max should also be numeric and of the same type. - It wasn't clear what to do if the current value is a BSTR. Pete will check with some developers. I guess there was no "next call", so the spec for IAccessibleValue VARIANT types wasn't finalized. It still isn't clear what to do if the current value is a BSTR, because it's completely unspecified. The interface description says IAValue represents a "numerical value": http://accessibility.linuxfoundation.org/a11yspecs/ia2/docs/html/interface_i_accessible_value.html#_details So I supported VT_I4, VT_I8, VT_R4, or VT_R8 (and VT_EMPTY). I didn't implement VT_BSTR - I don't even look for it. Then I fired up AccProbe and tried to set a value, and it sent me a BSTR! I don't have a clue what to do with it. At the moment, I do nothing. But IAccessibleValue::setCurrentValue doesn't spec any way to say I didn't set the value, like maybe I shouold return S_FALSE, or E_INVALIDARG or VT_EMPTY. (The spec for the "value" parameter has [out] in the 'Parameters:' list, but I assume that is a typo?) My current thinking is that VT_BSTR should not be a permitted type. As a server, if someone hands me a string and says "Here, set the numeric value of this object based on this string", then unless we specify that string precisely, the odds of me doing the right thing with that string are maybe 50-50. Is the string decimal or hex or octal? Does it represent a positive or negative number? Is it comprised only of a string of digits? Can it start with zeros? If so, what does that mean? Are letters allowed? Caps or lowercase? Localized? Is whitespace allowed? Are expressions allowed? Fractions? etc.... "-99", "BABE", "0x50F0", "76.5", "1.0", "1.00", "033", "007", "10,000,000", "3/4", "2+2", "XXXVI", "one", "twenty-seven", "quatre-vingt-dix-neuf", "pi", "root 2", "NaN". <grin> I don't think it makes sense to allow BSTR without fully specifying it - particularly as IAccessibleValue::setCurrentValue does not have a way for me to say S_FALSE or E_INVALIDARG. Can we specify the type of an IAValue as: VT_I4, VT_I8, (VT_R4?), VT_R8, (VT_EMPTY for getters only?) ...but not VT_BSTR. Car_______________________________________________ Accessibility-ia2 mailing list Accessibility-ia2@lists.linuxfoundation.org https://lists.linux-foundation.org/mailman/listinfo/accessibility-ia2 _______________________________________________ Accessibility-ia2 mailing list Accessibility-ia2@lists.linuxfoundation.org https://lists.linux-foundation.org/mailman/listinfo/accessibility-ia2
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