Catching events in a dropdown combobox

[Thabo]

Hi,

I''m using a GridGroupingControl Grid. In my grid, one of the columns has a a drop down combobox.

when a row in a grid is deleted, is it possible to detect this in my comboBox as well.
I know that to detect this in the grid i would use the RecordDeleted event handler. However i would also like my combobox to detect when a row in the parent grid is deleted.

Regards
David

[Administrator]

I am not sure I understand what you mean by wanting the combobox to know about a record being deleted.

If you have derived a combobox cell type, then you can have the combobox listen to the RowDeleted event on the GridGroupingControl just like any other object can listen to public events on the GridGroupingControl. You probably would want your renderer class (which actually handles the dropdown) to some how know about the GridGroupingControl so it can subscribe to the GridGroupingControl event. You could do this by adding a public method, say WireEvents(GridGroupingControl grid), and then call this method after your GridGroupingControl and custom cell type have been initialzed.

[Thabo]

>I am not sure I understand what you mean by wanting the combobox to know about a record being deleted.
>
>If you have derived a combobox cell type, then you can have the combobox listen to the RowDeleted event on the GridGroupingControl just like any other object can listen to public events on the GridGroupingControl. You probably would want your renderer class (which actually handles the dropdown) to some how know about the GridGroupingControl so it can subscribe to the GridGroupingControl event. You could do this by adding a public method, say WireEvents(GridGroupingControl grid), and then call this method after your GridGroupingControl and custom cell type have been initialzed.

Okay, i think i know how i''ll implement it. By the way, is there any event handler i can use apart from RecordDeleted/RecordDeleting. Is there maybe a RowDeleted event. I see that you''ve mentioned it above.

Regards
David

[Administrator]

The RowDeleted was a mistake. I meant to write RecordDeleted.

You did not indicate what your datasource is, but it likely has events that are raised when something is deleted from it. For example, if it is an IBindingList datasource, then the IBindingListChanged event (with a specific e.ListChangedType value) is raised when an object is deleted from the list.

[Thabo]

>The RowDeleted was a mistake. I meant to write RecordDeleted.
>
>You did not indicate what your datasource is, but it likely has events that are raised when something is deleted from it. For example, if it is an IBindingList datasource, then the IBindingListChanged event (with a specific e.ListChangedType value) is raised when an object is deleted from the list.

Okay, i must admit, i tried what you suggested about using the WireEvents method. However i still can''t get the combobox to listen to the event on the GGC.
Here is my sample code:

//GGC class code
public class Form1 : System.Windows.Forms.Form{

private GridGroupingControl gridGroupingControl1;

public Form1()
{
InitializeComponent();
InitializeProperties();
}

private void InitializeProperties()
{
GridTableControl tableControl = TableControl;
GridModel model = tableControl.Model.Model;
GridTableModel tableModel = TableModel;
GridCellModelCollection cellModelCollection = model.CellModels;

//
// Register Cell Models
//
string modelName = "PopUpCheckListBoxCellModel";
if (!cellModelCollection.ContainsKey(modelName))
{
cellModelCollection.Add (modelName, new PopUpCheckListBoxCellModel (model));
}

GridTableControlKeyEventHandler tcke = new GridTableControlKeyEventHandler(gridGroupingControl1_TableControlCurrentCellKeyDown);
TableControlCurrentCellKeyDown -= tcke;
TableControlCurrentCellKeyDown += tcke;
.
.
}

public void EsiDataSheet_TableControlCurrentCellKeyDown(object sender, GridTableControlKeyEventArgs e)
{
//my code here

}

public WireEvents()
{

}

}

//ComboBox class

public class PopUpCheckListBoxCellRenderer : GridDropDownCellRenderer
{
private CheckedListBox boxCheck = null;

protected override void OnInitialize ()
{
//i initialize my comboBox here
}

}

My problem is making the ComboBox register with the TableControlCurrentCellKeyDown event in the GGC. What is suppose to go into the WireEvent method?

Regards
David

[Administrator]

Try this.

Add these methods to your PopUpCheckListBoxCellRenderer class.

public void WireEvents(GridGroupingControl ggc)
{
  	ggc.TableControlCurrentCellKeyDown += new GridTableControlKeyEventHandler(ggc_TableControlCurrentCellKeyDown); 

}

public void ggc_TableControlCurrentCellKeyDown(object sender, GridTableControlKeyEventArgs e)
{
	//your code here
}

In your form, have code like this.

cellModelCollection.Add (modelName, new PopUpCheckListBoxCellModel (model));

//new code
PopUpCheckListBoxCellRenderer cr = gridGroupingControl1.TableControl.CellRenderers[PopUpCheckListBoxCellModel] as PopUpCheckListBoxCellRenderer;
cr.WireEvents(gridGroupingControl1);

[Thabo]

>Try this.
>
>Add these methods to your PopUpCheckListBoxCellRenderer class.
>

>public void WireEvents(GridGroupingControl ggc)
>{
>  	ggc.TableControlCurrentCellKeyDown += new GridTableControlKeyEventHandler(ggc_TableControlCurrentCellKeyDown); 
>
>}
>
>public void ggc_TableControlCurrentCellKeyDown(object sender, GridTableControlKeyEventArgs e)
>{
>	//your code here
>}
>

>
>In your form, have code like this.
>

>cellModelCollection.Add (modelName, new PopUpCheckListBoxCellModel (model));
>
>//new code
>PopUpCheckListBoxCellRenderer cr = gridGroupingControl1.TableControl.CellRenderers[PopUpCheckListBoxCellModel] as PopUpCheckListBoxCellRenderer;
>cr.WireEvents(gridGroupingControl1);
>

>
The follwing line of code gives me an error:

PopUpCheckListBoxCellRenderer cr = gridGroupingControl1.TableControl.CellRenderers[PopUpCheckListBoxCellModel] as PopUpCheckListBoxCellRenderer;

Error is:
[PopUpCheckListBoxCellModel] denotes a class where a variable was expected..

any ideas?

[Thabo]

>
>
>>Try this.
>>
>>Add these methods to your PopUpCheckListBoxCellRenderer class.
>>

>>public void WireEvents(GridGroupingControl ggc)
>>{
>>  	ggc.TableControlCurrentCellKeyDown += new GridTableControlKeyEventHandler(ggc_TableControlCurrentCellKeyDown); 
>>
>>}
>>
>>public void ggc_TableControlCurrentCellKeyDown(object sender, GridTableControlKeyEventArgs e)
>>{
>>	//your code here
>>}
>>

>>
>>In your form, have code like this.
>>

>>cellModelCollection.Add (modelName, new PopUpCheckListBoxCellModel (model));
>>
>>//new code
>>PopUpCheckListBoxCellRenderer cr = gridGroupingControl1.TableControl.CellRenderers[PopUpCheckListBoxCellModel] as PopUpCheckListBoxCellRenderer;
>>cr.WireEvents(gridGroupingControl1);
>>

>>
>The follwing line of code gives me an error:
>
>PopUpCheckListBoxCellRenderer cr = gridGroupingControl1.TableControl.CellRenderers[PopUpCheckListBoxCellModel] as PopUpCheckListBoxCellRenderer;
>
>Error is:
>[PopUpCheckListBoxCellModel] denotes a class where a variable was expected..
>
>any ideas?

Thanks i figured it out. I just had to add a string representing the name of the PopUpCheckListBoxCellModel.

[Administrator]

The argument of that call should be the string that holds the text that you used to register the cell model. If this was a standard combobox, the argument would be "ComboBox". What string did you use to register this cell model.