WPF: Eliminate transparency between grid cells.

views:

595

answers:

+1 Q:

WPF: Eliminate transparency between grid cells.

I have a Grid in WPF. The Grid has a transparent background (necessary) and each of the cells potentially has a different colored solid background, or maybe no background. When I put arbitrary content in these cells, when two adjacent cells both have colored backgrounds (same or different color, it doesn't matter) there is often (and unpredictably) a thin transparent line separating them, allowing you to see through the grid at that line.

Does anyone know how this could possibly be fixed?

Edit: Meant to mention it in my question, but I've tried enabling SnapsToDevicePixels anywhere and everywhere I can, to no avail.

+1 A:

Without seeing any code my guess is that you need SnapsToDevicePixels on the elements in the grid.

Todd White 2008-11-06 01:16:55

I had this same issue too... if that works... rock on!

Timothy Khouri 2008-11-06 01:24:09

Meant to mention it in my question, but I've tried enabling SnapsToDevicePixels anywhere and everywhere I can, to no avail.

Daniel Jennings 2008-11-06 01:48:48

Can you provide a sample of that code?

Todd White 2008-11-06 01:53:11

Ugh, I tried to write a sample but it doesn't capture the problem so I'll have to try to get more out from the "real" application to write a sample.

Daniel Jennings 2008-11-06 02:09:41

Can you pin it down to particular cell content? Does forcing a redraw (minimise etc) remove the issue? Is it possible you accidentally have an empty column/row at that point?

Donnelle 2008-11-06 03:36:43

I see the problem when one of the cells has content that varies. This is in a subclassed Window, and you can set the Content of one specific cell. Different sizes of Content (which stretch the cell and window) cause different lines to appear.

Daniel Jennings 2008-11-06 03:45:58

Appears when going bigger, or only when going smaller?

Donnelle 2008-11-06 04:59:32

And star or auto sizing?

Donnelle 2008-11-06 05:00:12

Ooh, I have a sample that can reproduce what I think is the same issue. Will post it in a new answer in a few ticks.

Donnelle 2008-11-06 07:54:17

+1 A:

Donnelle 2008-11-06 08:36:01

That's very similar to an approximation I tried, but this problem is solved via adding SnapsToDevicePixels=true on all of the elements (not sure where exactly it's necessary, so I put it on everything even though I think it trickles down.) I swear I have the problem even with SnapsToDevicePixels on.

Daniel Jennings 2008-11-06 16:49:50

Interesting-- I put SnapsToDevicePixels on the window, the grid, all the labels, the buttons and the TextBlock, and I still get those lines. What size-related properties are you using on the window? (SizeToContent etc).

Donnelle 2008-11-06 20:11:36

You could hack it by making the margins on the content -1. But I hate that. :(

Donnelle 2008-11-06 20:20:29

The window is SizeToContent="WidthAndHeight". I'll try the Margins technique just for the hell of it.

Daniel Jennings 2008-11-07 00:28:07

Did the margins fix it?

Donnelle 2008-11-19 01:43:48

ansaurus

tags:

views:

answers:

WPF: Eliminate transparency between grid cells.

related questions