I'm developing a WPF project where I need to validate textboxes on code-behind and then change the border color of those textboxes to some unknown color defined by the user configuration; the problem is that to overwrite the MouseOver effect I would need to set the value from XAML directly via ControlTemplate or Style.
Is there a way to get the current value assigned to the TextBox from XAML? Maybe binding it to itself?
I will appreciate any help you can give.
When validating a TextBox, or any control for that matter, it's common to use an adorner to display the validation error (in your case, setting the border color). You can have a look at an example here.
Using this method, you don't actually change the TextBox's border, but create a new visual layer on top of the TextBox that draws the new border around it. This is pretty much the way validations should be done in WPF, and it also solves your problem of having to deal with changing the TextBox's border value back and forth.
Related
I have seen this post: WPF ComboBox: background color when disabled
and some others...
But This solution causes me some problems. All I want is to make the textBox gray, and the ComboBoxItems gray and not selectable. I don't want to recreate all the style as the control won't work properly on both XP and seven. I don't want to choose one style for both, but I want XP style for XP and seven style for seven.
Is there a way to set the style so I can change the Background of the ComboBoxItems when the comboBox is Readonly?
Thanks in advance!
Update: It seems that the Drop down popup should be restyled instead. I got to find how.
I finally found my answer at many places on the web, pieces by pieces. The ComboBox style is composed of other controls. The PopUp is the one that interests me. It is not public, so I can't modify it as I want. It would have been interesting to define a style for my popup and to replace the original popup by it, but it is not accessible, so... I attempted to make a template that inherits from the template of the original ComboBox, but that is not possible neither. It won't accept inheritance for some good reasons How to Inherit a Control Template. So the template must be remade totally or not. The other option would be to make my own control that inherits from combobox and that changes the items to gray and not selectable when the combobox is readonly (into the code), but this is not a good idea in my situation. No solution for me. I will have to stick with the whole template redifinition. I hope this post will help someone in some way!
I want to change the display behavior of the selected item(s) in a WPF Listview. Specifically, I want to retain the custom textblock foreground colors that I've applied and apply a border around the item.
I am able to alter SystemColors.HighlightBrushKey and ControlBrushKey to change the background color of the selected item, but I don't know how to get it to stop changing the font color or use a border instead. I've tried manipulating the control template and have also searched Google for examples of how to do this, without success.
yeah, looks like you have to go through the pain of using ControlTemplates.
Good news is that via using Expression Blend, you can get current ControlTemplate for ListView and tweak the bit that you need and use that as your default ControlTemplate.
I have a control template defined, call it myVal, that is used for validation - this is then used for example in a Style targeting textbox where its Validation.ErrorTemplate is set as
Now say there are a number of such textboxes that sit in a view and that this slides in using TranslateTransform and BeginAnimation.
The result is that the adorner used in the ErrorTemplate doesn't follow the position of the textboxes as the view transitions - instead these stay in the starting position. However, the adorners reposition themselves correctly in relation to the textboxes as soon as I set focus or events such as mouse move.
How can I get the adorners to show in the correct position after the transformation without having to change the focus? Is there a way of delaying the validation until after the transition...or how can I "revalidate" the properties once the animation has finished? I read somewhere about calling invalidatevisual but can't see how I'd do that. Any help is much appreciated.
Cheers
Two ideas:
Try adding an AdornerDecorator around the textbox, or around the group of textboxes. This will tell WPF to add another layer for rending adorners. Adding a layer "closer" to the textboxes might help.
If you want to tell the adorner layer to re-render itself, then you can use something like the following code:
var al = AdornerLayer.GetAdornerLayer(myTextBox);
al.Update();
The new data validation in silverlight 3 has a red textbox that flies out to the right. This is a problem for me because I have have a textbox to the right that is getting covered by the popup.
How can I make this popup move somewhere else?
Retemplate the textbox. The tooltip is found in there. You can modify it using the placement property or margins to appear elsewhere.
in above image you would notice that, doted rectangle indicating ComboBox is focused
But the problem is it exceeding the text area of ComboBox... how do I align it with text area WPF Style?
Thanks
Without seeing your ControlTemplate it's difficult to give the best way to change it.
One slightly hackish way to do it is set Focusable on the ComboBox to False and then set Focusable on the TextBlock (or Label) to True. This should make it so the TextBlock gets focus whenever the ComboBox should.
My best guess though is that you have some weird margins going on, the real way to fix it would be to straighten those out.