[WIP] Header, headers, headers

[flagbug]

The Windows 8/WinRT/ModernUI/Whatever XAML framework has the really cool feature of "headers" for some controls

These are two TextBoxes, declared in XAML as following;

<StackPanel Orientation="Vertical">
    <TextBox Header="Username" Height="50" Width="150" />
    <TextBox Header="Password" Height="50" Width="150" />
</StackPanel>

This PR adds this feature via an attached property to some of the controls

TODO

• How big should the header be?
• Implement it for all TextBoxes
• HeaderTemplate property because people want to customize
• Additional controls?

[thoemmi]

It's very similar to the existing TextBoxHelper.UseFloatingWatermark, but I like it 😄

[jimbobsmith]

Just my 2 cents. The way I handled this in my projects was to create a header control which acts as a container for any input control. In this way, I only had to create a single control and can easily use it for any type of input control. I used a Label internally and handled the target binding internally etc. It is a bit more work to use that than to just add a property value but also avoids having to care about input control specific implementations.
e.g.
<Header Header="Some _Header>
<TextBox Text={Binding SomeTextValue} />
</Header>

[AzureKitsune]

👍

[amkuchta]

@punker76 @flagbug @thoemmi @jimbobsmith @Amrykid , I know that this is an old item, but I cam across it and had a thought about it - I'm just not sure how well it will be received...

What if, instead of having the Header be a separate property, we somehow modified the location of the floating watermark (e.g TextBoxhelper.WatermarkFloatLocation="Interior" or TextBoxHelper.WatermarkFloatLocation="Exterior"). You could even go a step farther by picking side (e.g. InteriorTop, InteriorLeft, ExteriorBottom, ExteriorRight, etc.). Again, I am not sure as to how well this merges the two ideas, but it might be a nifty way to utilize a property that already exists.

Thoughts...?

[punker76]

@amkuchta I don't like the idea to enhance the watermark. I'm more with a new control like the Badged control. A ContentControl which can take any stuff and surround it with a Header text...

[thoemmi]

I agree with @punker76. Watermarks and headers are two different paradigms which shouldn't be mixed.

[amkuchta]

@punker76 @thoemmi sounds good to me - I still would like to see the external floating watermark in addition to the new Header control (I don't want headers that always show, only when there is text in the control. When the control is empty, I want the instructions to be a watermark simply because I think it looks cleaner that way). I generated some code and accidentally rolled it into #2892 🤣 . However, I am now stuck on it 💩 . Any insight/help you guys could provide would be awesome. I'm trying to become a more active contributor instead of being a sponge who pushes ideas and issues but never offers to help...