#371 Single Row and Colum Coloring

[Louis-Dittmar]

No description provided.

[Louis-Dittmar]

After some huge problems with my company PC and private PC, I think I managed to make a good addition to the project.

I implemented a new feature that allows highlighting table rows and columns:
#371

[w-ahmad]

Thanks for the contribution @Louis-Dittmar!
How does this differ from the conditional cell styling implemented in #253?

[Louis-Dittmar]

Pretty SImple #253 is not Connected mine are connected, and they dont go over the cell border.

[w-ahmad]

Pretty SImple #253 is not Connected mine are connected, and they dont go over the cell border.

I apologize, but I did not fully understand. Could you provide further clarification?

[Louis-Dittmar]

My main Problem was, that this dosnt looks that good to me:

so I implemented it more stable, not for each item but for the total row and Colume, so you can connection between them.

Overview

	#253 Conditional Cell Styling	#380 Row/Column Highlighting
Based on	Data content (Predicate)	Position (Index)
Granularity	Each individual cell	Entire row or column
What gets set	Full WinUI Style	Only Background / Foreground
Connected cells	No — each cell is independent	Yes — cells in a row/column share one continuous highlight
Cell borders	Cells retain their own borders	Highlight renders beneath borders, appearing seamless

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Approach #253

Predicate-based. You write a C# function (Predicate<TableViewConditionalCellStyleContext>) that is called per cell to decide whether a given Style is applied. The decision is made based on the cell's underlying data object (context.DataItem), so the styling reacts to your model, not to a hardcoded position in the grid.

Approach #380

Index-based. You declare directly which row or column should receive a highlight color — no predicates, no data knowledge required. The API is intentionally simple and declarative.

Overlap resolution

When a row highlight and a column highlight intersect (e.g. row 2, column 0), the conflict is resolved via two properties:

Property	Behavior
MergeOverlappingHighlights	Blends both colors together
OverlappingHighlightPriority	One highlight wins (row or column takes precedence)

How i made it

EnsureHighlightColors() is called in TableViewCell. Unlike #253, this does not apply a full Style it sets Background and Foreground directly. This is also what makes the seamless band effect possible (what is needed for me): the highlight is applied beneath the cell border layer, so the entire row or column appears as one continuous colored stripe.

What i Totally Forgot

One functionality I hadn't thought about is that it's currently using a fixed index. What I would actually like is for it to move together with the row or column when its position changes, just like #253 but then the full row or Colume.

I think i do some small Changes again.