How to prevent Labels on bottom of window from disappearing when resizing? - wpf

Question

Basically I have a window is that SizeToContent="WidthAndHeight" and I have a Label positioned on the bottom. When resizing the window the label disappears. Unless I make the window a lot bigger.
I have the following XAML code:
<Window x:Class="DateKeeper.View.Test"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:DateKeeper.View"
mc:Ignorable="d"
Title="Test" SizeToContent="WidthAndHeight"
>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition/>
<ColumnDefinition/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition/>
<RowDefinition/>
</Grid.RowDefinitions>
<Label x:Name="label" Content="Label" HorizontalAlignment="Left" VerticalAlignment="Bottom" Grid.Column="0" Grid.Row="1" FontSize="36"/>
<TextBlock x:Name="textBlock" Grid.Column="1" Text="TextBlock" VerticalAlignment="Bottom" Grid.Row="1" FontSize="36"/>
</Grid>
</Window>
And here are the pictures:
Before Resizing
After resizing

Answer 1

SizeToWidthAndHeight sets the window's initial size. It doesn't prevent the user from resizing the window.
ResizeMode="NoResize" will prevent all resizing. If you want to set a minimum size and allow the window to be sized larger than that, you can't do that in pure XAML.
However, you can use that initial size as a minimum width and height with some simple code in a loaded handler, like so:
<Window
x:Class="DateKeeper.View.Test"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:DateKeeper.View"
mc:Ignorable="d"
Title="Test"
SizeToContent="WidthAndHeight"
Loaded="Window_Loaded"
>
Test.xaml.cs (or whatever you call the codebehind for the above Window):
private void Window_Loaded(object sender, RoutedEventArgs e)
{
MinWidth = ActualWidth;
MinHeight = ActualHeight;
}
You could also write an attached property that would do the same thing.
Update
This pure-XAML approach with Mode=OneTime seems promising:
<Window
...
SizeToContent="WidthAndHeight"
MinHeight="{Binding ActualHeight, RelativeSource={RelativeSource Self}, Mode=OneTime, PresentationTraceSources.TraceLevel=High}"
MinWidth="{Binding ActualWidth, RelativeSource={RelativeSource Self}, Mode=OneTime}"
...
...but in trace output, we see that it gets the values of ActualHeight and ActualWidth very early on, before the window is sized to its content, perhaps before then actual UI window object is even created -- at a point when the actual width and height are both reported as zero.

Answer 2

You have 50% now
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition/>
<ColumnDefinition/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="auto"/>
</Grid.RowDefinitions>
<Label x:Name="label" Content="Label" FontSize="36"
Grid.Row="1" Grid.Column="0" VerticalAlignment="Bottom" HorizontalAlignment="Left" />
<TextBlock x:Name="textBlock" Text="TextBlock" FontSize="36"
Grid.Row="1" Grid.Column="1" VerticalAlignment="Bottom"/>
</Grid>

Answer 3

Not sure what you are trying to create, but three things:
The elements are losing visibility because they are going off of the screen because they are running out of room
Your layout puts both text elements in the second row of the Grid
a. The elements will only have 50% of the available height to render
b. FontSize and Margins/Padding will further offset this
You have two different text element types (Label and TextBlock)
a. Both have different Margin/Padding values
b. The different layout values will result in different levels of visibility
If you don't want the elements to lose visibility, you need to set a minimum size of the Window (e.g. 325x150).