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Ticket A1228
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Flashing cells

created 21 years ago (modified 2 years ago)

Description:
I am developing software for an airport company. One of my form contains a Grid with a list of flights. I would like to highlight the flights which are delayed. Not just change the row color, but make it flashing. Does your Grid allow this?

Answer:
Yes, you can implement this functionality using the ExpressQuantumGrid's custom draw abilities - the OnCustomDrawCell or Styles.OnGetContentStyle events. Within the event handler, you should just change the color of the necessary rows as your needs dictate. Additionally, it is necessary to maintain a flag to define the row's flashing state (ON or OFF) and set up a timer to switch this flag.
To force the event handler to be called when the flag is switched, call the Grid's Invalidate method to invalidate its client area (if you are using multiple Views in a single Grid). If you are using a single View only, it is best to invalidate only the area which is occupied by its cells.
The attached sample shows this approach in action.
See also:
How to color a Grid cell at runtime
How to repaint a Grid cell
How to obtain the rectangular area of a particular View cell

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