Hi Stoyo

As you described in your previous thread, I am using one more Grid in my template (for derived node from shape node). This node don't have any child controls.

The childs for this control will be provided later on dynamically ( Trying to achive something like decorations - the only difference is that decorations gets resized and this won't get resized)

Majorly, the child for this additional grid will always be a grid and I need these child will be provided by application which captures some event ( like UpdateVisual addes decorations grid)

Which event I should override for this which raises event for my application. My application will build necessary child object and return it to the function which raised the event and later on fill the child in my grid hosted in generic.xaml file.

Just for your info - I am able to write UpdateVisual function in my derived class but it doesn't get triggered.

protected virtual void UpdateVisuals()
{
base.UpdateVisuals();
}
 

Regards
Rajesh

Hi Stoyo

I will be able to get the updatevisual function triggered. I was missing override keyword.

-Rajesh

Hi Stoyo

I am having problems with UpdateVisuals -

As I described previously, I have a derived class from ShapeNode and this class has its own genric.xaml file having following object -


<Grid x:Name="ChildGrid" Width="{TemplateBinding Width}" Height="{TemplateBinding Height}">

This object stored in global class level variable in OnApplyTemplate function as below -

childGrid = (Grid)base.GetTemplateChild("ChildGrid");

In my UpdateVisual function I have following code -

protected override void UpdateVisuals()
{
if ((this.childGrid != null) && (childGridItems == null))
{
childGridItems = new Grid();
childGridItems.RowDefinitions.Add(new RowDefinition() { Height = new GridLength(30, GridUnitType.Star) });
childGridItems.RowDefinitions.Add(new RowDefinition() { Height = new GridLength(30, GridUnitType.Star) });
childGridItems.RowDefinitions.Add(new RowDefinition() { Height = new GridLength(30, GridUnitType.Star) });
childGridItems.ShowGridLines = true;
childGrid.Children.Add(childGridItems);
}
base.UpdateVisuals();
}
 

If this.ChildGrid != null check is not added, I get exception, since UpdateVisual gets triggered from base class when bounds are set. [ Seen from Stack ]

Adding this.ChildGrid != null, check doesn't show me the grid which is added, when shapenode is shown on screen. If I try to resize node, then the child grid is visible since at that time again "UpdateVisual" gets triggered.

Can you tell me at what location should I do above coding [ For eq. If i need to raise event where should I do it ? ]

The childGrid object doesn't get set unless and until, OnApplyTemplate function gets triggered.
Or SetBounds function should not trigger UpdateVisual if "OnApplyTemplate" doesn't get executed and it should be executed once OnApplyTemplate gets executed.

Also - I shouldn't execute above code in "OnApplyTemplate" because when this code is executed, it is possible that shape is not set.

Let me know, How i achive this ?

-Regards
Rajesh