What are the TTextFormat (s) values (used in TextRect) and their meanings?
I want to apply some text formats in a procedure TextRect
, but I haven't found any documentation. The Delphi help, in the TextRect
link, said TextFormat variabile can only have 3 values: tfAutoText, tfText, tfPlainText
. But here on StackOverflow I found some examples TextRect
with other text format values, eg tfEndEllipsis
. I searched for this using Delphi, and found another set with many text format values. When I tried them, the first set with these 3 values doesn't work at all, but the second set does. I am embarrassed. Which set is good? The second seems to be because it works. But then what is the first set for?
And what is the meaning of the following values (from the second set)?
- tfCalcRect
- tfEditControl
- tfExpandTabs
- tfExternalLeading
- tfModifyString
- tfNoClip
- tfNoPrefix
- tfRtlReading
- tfWordBreak
Others are obvious ...
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The documentation is wrong. Three types listed here are listed types ( tfAutoText
, tfText
, tfPlainText
) do not exist.
You need to read the source of the block Vcl.Graphics
to understand it. The source looks like this:
type
TTextFormats = (tfBottom, tfCalcRect, tfCenter, tfEditControl, tfEndEllipsis,
tfPathEllipsis, tfExpandTabs, tfExternalLeading, tfLeft, tfModifyString,
tfNoClip, tfNoPrefix, tfRight, tfRtlReading, tfSingleLine, tfTop,
tfVerticalCenter, tfWordBreak, tfHidePrefix, tfNoFullWidthCharBreak,
tfPrefixOnly, tfTabStop, tfWordEllipsis, tfComposited);
TTextFormat = set of TTextFormats;
And these values map directly to flags used by the Win32 API function DrawTextEx
. You can find out what they mean by reading the documentation for this function.
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