XamGrid Page Up key | Infragistics Forums

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XamGrid Page Up key

Aziz posted over 14 years ago

Hi, I am looking for a solution to a problem i am facing with xamdatagrid on using page up key. I have a xamdatagrid with more number of rows than the visible area of the grid, say few hundreds. When i want to move up a page and press 'Page Up key', the selection moves to the top visible row of the grid for the first time and on consecutive 'page up' the selection moves up a page. For example, if i have 10 visible rows in my grid(datasource has 200 records) and my current selected row is 25th(means that i have rows from 20 to 29 visible), then when i press page up key the selection goes to the first visible row(20th), on consecutive page up action, the selection goes to 10th row. I expect the rows to move by a page ie 10 rows even the first time. With the above example, i want to move to 15th row on my first page up action. I want to know whether i am missing anything or the normal behaviour of the grid is such. Thanks in advance for the suggestions. Aziz

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John Doe posted over 14 years ago in reply to Arthi

Hello Arthi and Aziz,

The PageUp/PageDown keys are associated with respectively RecordFirstDisplayed/RecordPageAbove and RecordLastDisplayed/RecordPageBelow commands of the XamDataPresenter. As the XamDataGrid has no notion of page size (records displayed) you would have to control this manually. What you can do is to handle the ExecutingCommand event of the XamDataGrid and cancel these events and provide your custom logic. Below is a simple implementation of the suggested approach :

 private  void  xamDataGrid1_ExecutingCommand(object  sender, ExecutingCommandEventArgs  e)

             XamDataGrid  grid = sender as  XamDataGrid ;

             int  count = grid.GetRecordsInView(false ).Count();    // records per page

             int  index = grid.GetRecordsInView(false ).ToList<Record >().IndexOf(grid.ActiveRecord); // index of active record

             if  (e.Command == DataPresenterCommands .RecordFirstDisplayed)

                 // scroll up

                 grid.ScrollInfo.SetVerticalOffset(grid.ScrollInfo.VerticalOffset - count);

                 e.Cancel = true ;

             if  (e.Command == DataPresenterCommands .RecordLastDisplayed)

                 // scroll down

                 grid.ScrollInfo.SetVerticalOffset(grid.ScrollInfo.VerticalOffset + count);

                 e.Cancel = true ;

             // activate the new record based on the index of the previously active one

             grid.GetRecordsInView(false ).ElementAt(index).IsActive = true ;

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Arthi posted over 14 years ago

Hi,

I am also facing the same problem, Can anyone help us.......

arthi
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