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Subject Re: Question about text clipping mechanism in word processor
Date Wed, 20 Jun 2012 11:07:48 GMT
Hi,

On 20.06.2012 11:40, Oliver-Rainer Wittmann wrote:
> On 20.06.2012 10:47, ZuoJun Chen wrote:
>> Hi All,
>>
>> I'm trying to handle a bug on text clipped in document . See Bug
>> 119476<https://issues.apache.org/ooo/show_bug.cgi?id=119476> for more
>> details.
>>
>> After investigation, I have some insights. When paragraph line spacing is
>> smaller than font size,
>>
>> the text contained becomes too large for fit, then AOO will clipped text
>> as Incomplete part. The code
>>
>> for text clipped mechanism can be located in method
>> <SwTxtFormatter::CalcRealHeight(..)> at
>>
>> sw\source\core\text\itrform2.cxx line 1756.
>>
>>
>> I thought that the preferable way to fix this would be to considering the
>> spacing contains above paragraph
>>
>> spacing property and line spacing property as the conditions to determine
>> whether clipping text. e.g.
>>
>> Clipped text if the sum of adding above paragraph spacing and line
>> paragraph spacing is smaller than font size,
>>
>> otherwise do not clip text since above paragraph spacing and line spacing
>> are enough to display the text.
>>
>
>  From my point of view this change makes sense.
> If the text of the first line of a paragraph "founds" enough space in the "above
> paragraph spacing", the text should not be clipped.
>
> I had already looked at the patch and it looks ok.
> I will have a deeper look regarding how to determine the value of "above
> paragraph spacing". As far as I remember in some cases depending on certain
> compatibility option, the "above paragraph spacing" is not applied. E.g., if the
> paragraph is the first on a page and compatibility option "Add paragraph and
> table spacing at tops of pages ..." is not checked, the "above paragraph
> spacing" is not applied.
> May be I find a solution to access the already calculated and applied "above
> paragraph spacing".
>

I had a deeper review on the patch.
Please see my comment in the issue [1].

[1] https://issues.apache.org/ooo/show_bug.cgi?id=119476#c5

Best regards, Oliver.

>>
>> Noticed that there is a property named below paragraph spacing, but I'm
>> not sure whether there is a need to consider this one,
>>
>> Do this property impact text clipped in paragraph?
>>
>
> May be - I am not sure.
> Thus, a paragraph could have a "below paragraph spacing" and the first text line
> of the following paragraph could be to small. This would cause clipping, but may
> be the "below paragraph spacing" from the previous paragraph could be used to
> avoid the clipping.
>  From my point of view avoid the clipping in this case would also make sense.
> May be my above mentioned further investigation regarding the available space
> above the first text line of a paragraph would solve this, too.
>
> Zuojun, do you know how MS Word will behave in this case?
>
>
> Best regards, Oliver.


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