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| Title:
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Moving to Delphi 2010, TDBGrid and Title Clicks
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| Author:
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Bob Swart |
| Posted:
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12/9/2009 11:33:05 AM
(GMT+1)
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| Content:
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Delphi 2010 introduces theming for the TDBGrid control, using the DrawingStyle property (which can be gdsThemed (default), gdsClassic or gdsGradient) and introducing GradientStartColor and GradientEndColor for the latter.
It's not the only change made to the TDBGrid control, unfortunately. New are also the dgTitleClick and dbTitleHotTrack flags in the Options property. And although there's no documentation for them in the help (yet), it's pretty obvious what they do. Specifically, setting the dgTitleClick flag in the Options property will ensure that the OnTitleClick event handler is called (when assigned) when someone clicks on the title.
Their intended meaning isn't the issue here. And when you place a new TDBGrid component on a form, the options dgTitleClick and dbTitleHotTrack are included in the Options property by default. However... when you take an existing VCL forms application, and open it up with Delphi 2010, then these previously unknown Option flags will not be in the DFM file, so they will not be set, and hence dgTitleClick and dgTitleHotTrack will be false. And as a surprise the OnTitleClick event handler is no longer called. Simply by recompiling an existing Delphi VCL application in Delphi 2010. Ouch!
So, if you or your customers suddenly find that clicking on TDBGrid titles no longer works, check the dgTitleClick flag of the Options property (of all your TDBGrids).
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