Why doesn't a textbox stretch to fill space in a stackpanel? Is this by design? In a grid, the textbox stretches as expected.
Yes, it's by design. The StackPanel will allocate the space the TextBox asks for. If you haven't set a width on the TextBox, it will require only enough width to fit its text.
Kent's answer seems right.
To still force override the StackPanel behavior, I think you'd need to dynamically compute-set the Width property of the contained elements OR some funky override of MeasureOverride. I'd rather use another layout manager/panel. Some things I noted..
The default value for HorizontalAlignment and VerticalAlignment properties of child elements is Stretch (if you don't specify one explicitly).
The StackPanel will stretch elements based on its Orientation property value. So
Orientation=Horizontal means all elements will be vertically stretched to max. Elements flow horizontally.
Orientation=Vertical means all elements will be horiz stretched to max. Elements flow vertically.
Unless explicitly specified, Width and Height of child elements are NaN. If you specify an explicit value, StackPanel will honor them over the Horiz and Vert Alignment settings.
The StackPanel itself has HorizontalAlignment and VerticalAlignment that adds a further layout twist. You can experiment with this example.
StackPanel
The default value is stretch for both
HorizontalAlignment and
VerticalAlignment of content that is
contained in a StackPanel.
HorizontalAlignment
When Height and Width properties are
explicitly set on an element, these
measurements take higher precedent
during layout and will cancel the
typical effects of setting
HorizontalAlignment to Stretch.
I needed items to be sized evenly, but stacked vertically.
I used a UniformGrid, and set the Columns property to 1. (tested with a TextBox, and it stretches like you want)
Related
Does the horizontal alignment = stretch get applied in measure or arrange? does it affect the actualwidth and actualheight of the object? or does it work in some other way? I can't seem to find any documentation on how it is actually being applied during layout
Edit: after some testing it appears that Width and actual width are not changed by horizontal alignment = "stretch"
I'm wondering if maybe it is applied on render.
"When the Height and Width properties are explicitly set on an object, these measurements take precedent during layout and can cancel the typical effects of setting HorizontalAlignment to Stretch.
Canvas does not use HorizontalAlignment when composing layout, because Canvas is based on absolute positioning. In general, the value of HorizontalAlignment is potentially treated differently by any given object that is capable of having one or more FrameworkElement objects as child content."
but it doesn't specify whether the stretch actually changes the width or actualwidth or whether it just overrides it. Anyway it overrides it as far as I can tell, leaving width and actualwidth alone.
I have a UserControl, I do not set it's Width / Height, the UserControl has 2 TextBox inside a StackPanel.
when I place it in a Column where it's Width="Auto", the control stretches to fill the entire column, while the 2 TextBox maintain their Width (desire)
I want to keep the Control Width to it's Content Width, how to I do that ?
HorizontalAlignment="Left"
This will keep the Control from stretching based on the container which it resides and instead will expand based on its contents if the Width is set to Auto.
MSDN provides an overview on Alignment, Margins, and Padding which may be of assistance.
What can a DockPanel do that a StackPanel cannot? If anyone has an image of something that can be achieved with a StackPanel, but not a DockPanel, than that would be great.
Stack Panel: The StackPanel, as the name implies, arranges content either horizontally or vertically. Vertical is the default, but this can be changed using the Orientation property. Content is automatically stretched based on the orientation (see screenshot below), and this can be controlled by changing the HorizontalAlignment or VerticalAlignment properties.
Dock Panel: The DockPanel is used to anchor elements to the edges of the container, and is a good choice to set up the overall structure of the application UI. Elements are docked using the DockPanel.Dock attached property. The order that elements are docked determines the layout.
When I place a Datagrid in a WPF Grid Layout container, the datagrid lengthens the Grid Layout.
I want it to occupy only the space available on screen.
Make sure your Grid.ColumnDefinition or Grid.RowDefinition's Width or Height is not set to Auto. If you set it to a fixed size or a star size then the row/column should not resize.
If you're still having problems a code sample would be useful.
You should place your Datagrid into a ScrollViewer, and the ScrollViewer into your Grid cell.
the grid is placed inside a tabitem.
I tried the scrollviewer. but the only thing that happens:
the scrollviewer gets as large as the too long datagrid.
as the tabitem can vary in height, I would rather not like to specify a fixed height for the grid.
Before asking this question I have looked at all related questions, but have not found anything relevant.
In my application I have toolbox style bar, which is basically stack panel with bunch of buttons. User may change which buttons are shown in toolbar.
Window width may be changed, but it can not be smaller then width of toolbar.
At first I was hoping to bind the MinWidth property to the StackPanel Width property and create converter that adds few pixels to Width of the StackPanel. The problem is that my converter does not get Width of StackPanel, just NaN as value :(
Unfortunately, StackPanel width is set to Auto and I can not change that.
Is there any way I can make my Window MinWidth dependable on Width of StackPanel?
Use ActualWidth, not Width.
Width is the requested width, or NaN for "Auto", ActualWidth is the, well, actual width after all the layout is calculated.