Hi...
i got some problem on my custom new row element according to this link, but on my code i made with button element
internal class CustomGridNewRowElement : GridRowElement{ private GridCellElement cellElement; private RadButtonElement radButtonElement; public RadButtonElement AddButtton => this.radButtonElement; public CustomGridNewRowElement() { } protected override void CreateChildElements() { base.CreateChildElements(); this.cellElement = new GridCellElement(null, this) { StretchHorizontally = true, StretchVertically = true }; this.radButtonElement = new RadButtonElement("Add New"); this.Children.Add(cellElement); this.cellElement.Children.Add(this.radButtonElement); this.cellElement.ClipDrawing = true; } public override bool IsCompatible(GridViewRowInfo data, object context) { return data is CustomGridViewRowInfo; }}internal class CustomGridViewRowInfo : GridViewNewRowInfo{ public CustomGridViewRowInfo(GridViewInfo viewInfo) : base(viewInfo) { } public override Type RowElementType => typeof(CustomGridNewRowElement);}the problem is im missing an rowheadercellelement as shown on attachment, i need the Add Button only fit on GridViewDataColumns like a standard GridViewNewRowInfo,
and shown on 2nd attachment it throw an exception when mouse right button press / contextmenu on Add Button Element, i couldnt find whats wrong.
any help please.
4 Answers, 1 is accepted
Hello, Agung,
Following the provided information, I have created a sample project. Indeed, when you right-click the RadButtonElement in the new row, an error occurs. This is because there is no ColumnInfo applied to the GridCellElement that hosts the button.
The possible solution that I can suggest is to create a custom GridCellElement and override its ShowContextMenu method. Comment the default logic and if you want to show a menu, feel free to create one:
internal class CustomGridNewRowElement : GridRowElement
{
private GridCellElement cellElement;
private RadButtonElement radButtonElement;
public RadButtonElement MyProperty
{
get
{
return this.radButtonElement;
}
}
public CustomGridNewRowElement()
{
}
protected override void CreateChildElements()
{
base.CreateChildElements();
this.cellElement = new CustomGridCellElement(null, this) { StretchHorizontally = true, StretchVertically = true };
this.radButtonElement = new RadButtonElement("Add New");
this.Children.Add(cellElement);
this.cellElement.Children.Add(this.radButtonElement);
this.cellElement.ClipDrawing = true;
}
public override bool IsCompatible(GridViewRowInfo data, object context)
{
return data is CustomGridViewRowInfo;
}
}
public class CustomGridCellElement : GridCellElement
{
public CustomGridCellElement(GridViewColumn column, GridRowElement row) : base(column, row)
{
}
protected override void ShowContextMenu()
{
RadContextMenu menu = new RadContextMenu();
menu.Items.Add(new RadMenuItem("Item1"));
menu.Show(new Point(MousePosition.X,MousePosition.Y) );
}
}
I hope this information helps. If you need any further assistance please don't hesitate to contact me.
Regards,
Dess | Tech Support Engineer, Sr.
Progress Telerik
Rank 1
Hi Dess, your code works perfect. Thank you
One more thing, if it possible how RadButtonElement can fit in GridViewDataColumns only? i need the buttonelement fit on the blue rectangle, please check the attachment.
how to manipulate the GridRowHeaderCellElement.
im trying add GridRowHeaderCellElement with this code:
protected override void CreateChildElements(){ try { base.CreateChildElements(); this.cellElement = new CustomGridCellElement(null, this) { StretchHorizontally = true, StretchVertically = true }; this.AddButton = new RadButtonElement("Add New"); this.Children.Add(newGridRowHeaderCellElement(null, this)); this.Children.Add(cellElement); this.cellElement.Children.Add(this.AddButton); this.cellElement.ClipDrawing = true; } catch (Exception e) { throw e; }}but it throw Object reference not set to an instance of an object.
at Telerik.WinControls.UI.GridVirtualizedCellElement.BindRowProperties()
at Telerik.WinControls.UI.GridRowHeaderCellElement.BindRowProperties()
at Telerik.WinControls.UI.GridVirtualizedCellElement.Initialize(GridViewColumn column, GridRowElement row)
at Telerik.WinControls.UI.GridRowHeaderCellElement..ctor(GridViewColumn column, GridRowElement row)
at CustomNewRow.CustomGridNewRowElement.CreateChildElements()
the error i thing is cause the GridRowHeaderCellElement columninfo is null
any help?
Hello, Agung,
You can apply a left offset in the RadButtonElement.Margin property:
protected override void CreateChildElements()
{
base.CreateChildElements();
this.cellElement = new CustomGridCellElement(null, this) { StretchHorizontally = true, StretchVertically = true };
this.radButtonElement = new RadButtonElement("Add New");
this.Children.Add(cellElement);
this.radButtonElement.Margin = new Padding(20, 0, 0, 0);
this.cellElement.Children.Add(this.radButtonElement);
this.cellElement.ClipDrawing = true;
}
Should you have further questions please let me know.
Regards,
Dess | Tech Support Engineer, Sr.
Progress Telerik
Rank 1