sample data grid code?
lists at mangomultimedia.com
Sat Apr 11 00:35:58 EDT 2009
On Apr 10, 2009, at 5:05 PM, sadhu at castandcrew.com wrote:
> What I really want to do is this; have the data grid scroll, or focus
> change if that is the right terminology, to visibly show the cell
> that is
> being processed, and then cycle through every row, top to bottom,
> and on
> each row cycle through every cell, left to right, and then perform
> action on the data in each cell (such as turn it red if it is
> I would like the user to be able to visually see the progress as the
> validity check is processing.
> I think this will make a very appealing app, not to mention,
> useful. For
> example, something the Java guys in our shop would be hard pressed
> to say
> "we can do that". At least, in the same time frame. :-)
Thanks for the additional info Sadhu. When working with a data grid
you update the UI by changing the data in the internal data grid
array. Updating the data associated with a data grid triggers messages
to be sent to the controls displaying that data.
You can update all of the data at once by setting the dgData or dgText
properties or you can update individual indexes/lines by setting the
dgDataOfIndex/dgDataOfLine. If you just want to update a specific key/
column then you can use SetDataOfIndex/SetDataOfLine. Further info on
each of these is available here:
Now, when you update data in the data grid the UI elements associated
with the index or line you are changing are updated. The data grid
update the UI by sending the FillInData message to your row/column
With that background let's look at your particular question. You want
to perform some validation checks on each row in the data grid and
visually represent those validation checks to the user. Let's assume
you have already populated the data grid with some data and there are
no visual cues as to whether or not the data is valid. Now you want
to go through each line one by one and validate. Here is how you might
* Set up a repeat loop that goes through each line in the data grid.
* For each line set a flag in the data grid that signifies that the
data should be validated.
* In the FillInData message only show validation UI elements if the
flag is set.
Some example code follows that is entirely untested :-)
====== Repeat Loop ======
repeat with theLineNo = 1 to the dgNumberOfLines of group "DataGrid"
## set flag so line redraws with validation
dispatch "SetDataOfLine" to group "DataGrid" with theLineNo,
## Scroll line into view
dispatch "ScrollLineIntoView" to group "DataGrid" with theLineNo
## A slight delay so user can see validation happening
wait 100 milliseconds
====== FillInData Code For a Column ======
on FillInData pData
## Is the validation flag set for particular row?
if GetDataOfIndex (the dgIndex of me, "validate") is true then
## perform validation
put MyDataValidationRoutine(pData) into theDataIsValid
if theDataIsValid then
set the backgroundColor of graphic 1 of me to "blue"
set the backgroundColor of graphic 1 of me to "red"
## no validation
set the backgroundColor of me to empty
Does the above make sense? If it does, does it do what you want?
Blue Mango Learning Systems
www.bluemangolearning.com - www.screensteps.com
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