So im trying to get my scroll bar to A only show up as needed and B show up only around my description text
Right now the scroll view is going from the top of the window to the bottom
<Window x:Class="WpfApplication3.DataWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="DataWindow" Height="300" Width="300">
<Grid>
<Label x:Name="lblTitle" Content="Label" HorizontalAlignment="Left" Margin="96,25,0,0" VerticalAlignment="Top" Width="186"/>
<Label x:Name="lblPublishDate" Content="Label" HorizontalAlignment="Left" Margin="96,53,0,0" VerticalAlignment="Top" Width="186"/>
<Image x:Name="imgPic" HorizontalAlignment="Left" Height="81" Margin="10,10,0,0" VerticalAlignment="Top" Width="81"/>
<ScrollViewer>
<TextBlock x:Name="tbDesc" HorizontalAlignment="Left" Margin="10,96,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Height="167" Width="272" Text="TextBlock" ScrollViewer.HorizontalScrollBarVisibility="Disabled" ScrollViewer.VerticalScrollBarVisibility="Auto" />
</ScrollViewer>
</Grid>
A grid tries to let it's children take up all availble space.
Your ScrollViewer is one of the children, so it will fill all available space by default.
There are a number of ways around this.
You could use a different panel type, one that doesn't try to stretch it's children to fill all available space. Based on what you're doing with excessively large margins, a Canvas might be suitable.
I would suggest reading this for a quick understanding of WPF's available Layout Panels : WPF Layouts - A Visual Quick Start
Another alternative is to give your Grid some Row Definitions, and specify that the row containing the ScrollViewer should be of a fixed size, or should be sized so it fits whatever size the child object wants (Height="Auto")
Or you could give your ScrollViewer a fixed height, and set it's VerticalAlignment property so it gets docked to either the top or bottom of the Grid.
Personally I would recommend the first option - reviewing WPF's layout system and determining a more approrpiate panel type for your layout. And if the most appropriate panel type is a Grid, then I would highly recommend using the RowDefinitions and ColumnDefinitions to give your Grid some structure, rather than trying to use excessively large Margins to position your controls.
You're pretty close, the problem appears to be an issue of layout. Because the controls are arranged in the grid without row and column definitions the scrollviewer is attempting to resize to the full size of the grid while the textblock is adhereing to its fixed size and margin. Try the following starting point and see if it helps:
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="150"/>
<RowDefinition/>
</Grid.RowDefinitions>
<StackPanel Grid.Row="0">
<Label x:Name="lblTitle" Content="Label" HorizontalAlignment="Left" Width="186"/>
<Label x:Name="lblPublishDate" Content="Label" HorizontalAlignment="Left" Width="186"/>
<Image x:Name="imgPic" HorizontalAlignment="Left" Height="81" Width="81"/>
</StackPanel>
<ScrollViewer Grid.Row="1" HorizontalScrollBarVisibility="Disabled" VerticalScrollBarVisibility="Auto">
<TextBlock x:Name="tbDesc" HorizontalAlignment="Left" TextWrapping="Wrap" Text="TextBlock"/>
</ScrollViewer>
</Grid>
Related
Im having trouble controlling the exact layout of a button control with XAML.
It seems that whatever i do the button is of a minimum width.
I have a simple button with only a textblock inside the button. But the button has a lot of margin and padding that i cant seem to get rid of (i know of negative margins and padding).
The things i want to know is:
1. Why in the world was it designed this way.
2. what are the groundrules for controlling the exact layout of a button?
My code is as follows:
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="80"></RowDefinition>
<RowDefinition Height="*"></RowDefinition>
</Grid.RowDefinitions>
<StackPanel Grid.Row="0"></StackPanel>
<Pivot Grid.Row="1">
<Pivot.Title>
<StackPanel Orientation="Horizontal" Margin="-15,-3,0,0" Background="red" Width="480">
<Button Background="Blue" x:Name="btnStudies" Click="btnMenuItem_Click" Width="20">
<TextBlock Text="Title" Foreground="White"></TextBlock>
</Button>
<Button Background="Green">
<TextBlock Text="Title" Foreground="White"></TextBlock>
</Button>
<Button Background="Blue" Click="btnMenuItem_Click">
<TextBlock Text="Title" Foreground="White"></TextBlock>
</Button>
<Button Background="Blue" Click="btnMenuItem_Click">
<TextBlock Text="Title" Foreground="White"></TextBlock>
</Button>
<Button Background="Blue" Click="btnMenuItem_Click">
<TextBlock Text="Title" Foreground="White"></TextBlock>
</Button>
</StackPanel>
</Pivot.Title>
</Pivot>
</Grid>
I want five buttons in a row but these are already too wide for the screen (windows phone). Changing the width doesnt seem to have any effect (why is it there).
The textBlock control within the button the button is as wide as the text on it, but i dont seem to have any control on the width of the button. In HTML you only have padding or margin when you define it but in xaml it just seems to be there and for me its unclear how to undo that.
*****EDIT*****
After reading Rachel's reply i decided to start from the ground up.
Using the code below i still have no control over how wide the button is because it uses a certain amount of padding that i cant seem to remove. The button has a width of about 110 when i define a width lower than that it doesnt change. Margins and paddings of 0 have no effect at all (dont want to use negative values just yet because that doesnt seem very intuitive). So the code below is very simple but still the button takes up an amount of space that i dont have any control over. I cant imagine a reason why it was designed this way.
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="400" />
</Grid.ColumnDefinitions>
<StackPanel Width="300" Background="Red" HorizontalAlignment="Left">
<Button Background="Blue" HorizontalAlignment="Left" Width="100" Margin="0" Padding="0">
<TextBlock Text="Title" Width="Auto" HorizontalAlignment="Left" />
</Button>
</StackPanel>
</Grid>
The type and size of the parent panel containing the control affects the size/layout of the child controls.
In your case, you have a Grid as your parent panel, and a Grid defaults to taking up all available space. In addition, children placed inside the grid default to taking up all available space as well unless you specify otherwise.
So your <Pivot> is being assigned a width equal to Grid.Width, and Pivot.Title sounds like it's being assigned a width equal to Pivot.Width, and StackPanel is being assigned a width equal to Pivot.Title.Width... you get the picture.
To specify that a control should not take up all available space, specify a HorizontalAlignment or VerticalAlignment property to tell it what side of the parent panel to dock the item on.
For example
<Pivot Grid.Row="1" HorizontalAlignment="Left">
or
<StackPanel OWidth="480" HorizontalAlignment="Left" ...>
If you're new to WPF's layout system, I would recommend reading through the codeproject article WPF Layouts: A Quick Visual Start to quickly learn what the main layout panels are for WPF.
I have an XAML user control that has a Grid with various TextBoxes and Labels in it.
<UserControl>
<Grid Background="#FFE8EEF7" Height="Auto" Width="Auto" HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
<!-- just various TextBoxes and Labels here -->
<TextBox x:Name="txtBottomTextBox" HorizontalAlignment="Left" Height="24" Margin="800,37,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="50" IsEnabled="False"/>
</Grid>
</UserControl>
I then have the user control on my main window like so:
<Window>
<Grid Width="Auto" Height="Auto">
<MyCtrlLib:GenParams Name="genParams1" Width="Auto" Height="Auto" Margin="0,0,0,0"
HorizontalAlignment="Stretch" VerticalAlignment="Stretch" />
</Grid>
</Window>
Everything is fine except for the lack of space between the bottom-most TextBox and the bottom of the user control. There is perhaps three pixels of space at most between the two, and so I would like to have more padding (maybe up around 8 pixels). However, I've tried dumping in padding where I can, but nothing works like I want it to.
Any suggestions on how I can force some padding between the bottom-most TextBox and bottom of the user control?
Set the TextBox margin like this (the values go clockwise starting from left):
Margin="800,37,0,8"
I've tried almost every combination of alignments and margins, to no success. The ListBox is on a WPF page, which is bound to a frame on the main window.
The ListBox itself is fine. It aligns just as I expect it would. My ListBoxItem contains an Image and a TextBlock. The TextBlock gets cut off.
As you can see from the following image, things are mostly good.
The ListBox is appropriately offset from the left edge and the top of that blue box. The content Image and TextBlock are fairly centered and so is the ListBoxItem outline. This is on my development machine.
I thought the whole reason for using grids, grid lines, and alignment properties, was so we didn't have to set a hard coded size. That our controls would resize themselves. Which does actually work just fine for everything else.
But when I place this on a small screen, I get this:
The ListBox itself is still aligned correctly. But now the ListBoxItem is forced down. It's top alignment is still good, but the bottom is pushed down so we can't see the TextBlock or the bottom of the ListBoxItem.
Here's my XAML:
<Grid VerticalAlignment="Stretch" HorizontalAlignment="Stretch" Margin="1">
<Grid.RowDefinitions>
<RowDefinition Height="292*" />
<RowDefinition Height="30*"/>
</Grid.RowDefinitions>
<ListBox Grid.Row="1" Name="lbButtons" Margin="2,0,0,1.5" VerticalAlignment="Stretch" HorizontalAlignment="Stretch" Visibility="Visible" >
<StackPanel Name="spListBoxItems" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Orientation="Horizontal">
<ListBoxItem Margin="0,0,0,0" VerticalAlignment="Stretch" HorizontalAlignment="Stretch" >
<StackPanel Orientation="Vertical" HorizontalAlignment="Center" Margin="10,5,10,5">
<Image Source="/COBAN.CobanConsole.UI;component/Images/Buttons/Light/record48_light.png" />
<TextBlock Text="Record" Margin="5,5,0,0"></TextBlock>
</StackPanel>
</ListBoxItem>
</StackPanel>
</ListBox>
</Grid>
Not much to it. Any ideas on what's going on?
You're using * units on your grid row definitions. Those are relative measures: they just tell you what proportion of the space the rows can take up. If you need your listbox to have a specific height, you should change your second row to have an absolute size instead, like this:
<Grid.RowDefinitions>
<RowDefinition Height="*" />
<RowDefinition Height="30"/>
</Grid.RowDefinitions>
I'm trying to get a window similar to a chat window, where a list of text items is drawn. The window should be resizable and each text item should wrap if it does not fit on one line.
What I have so far:
MessageItem - A user control, multiline TextBlock in a Border
<Grid VerticalAlignment="Stretch" HorizontalAlignment="Stretch">
<Border BorderBrush="Silver" BorderThickness="1" Height="Auto" HorizontalAlignment="Left" Margin="0,10,0,10" Name="messageContainer" VerticalAlignment="Top" Width="Auto">
<TextBlock Height="Auto" HorizontalAlignment="Stretch" Margin="0" Name="messageContent" VerticalAlignment="Stretch" Width="Auto" Text="This is some longer text. Wow that wasn't as long as I thought." TextWrapping="Wrap" Padding="10" />
</Border>
</Grid>
MessageBox - A user control with a ListView that holds MessageItems
<Grid Name="messageGrid" VerticalAlignment="Stretch" HorizontalAlignment="Stretch">
<ScrollViewer VerticalScrollBarVisibility="Auto">
<!--<StackPanel Height="Auto" HorizontalAlignment="Stretch" Margin="0" Name="messagePanel" VerticalAlignment="Stretch" Width="Auto">
</StackPanel> -->
<ListView HorizontalContentAlignment="Stretch" VerticalContentAlignment="Stretch">
<local:MessageItem></local:MessageItem>
</ListView>
</ScrollViewer>
</Grid>
The Problem:
If I use the commented out StackPanel for holding MessageItems, It will shrink the MessageItem (and cause the text to wrap) correctly. If I use the ListView, it does not shrink.
I've more or less figured out why from research, but I haven't been able to figure out how to get around it. As far as I can tell I need to override MeasureOverride and/or ArrangeOverride, but I'm far too new to WPF to know WTF I'm doing. (rimshot)
I'm not sure why you're putting the ListView inside a ScrollViewer since the ListView has its own ScrollView internally.
In order to get your MessageItems to wrap you need to turn off any horizontal scrollbars, otherwise the container (ListView or ScrollViewer) will give the MessageItem as much space as it requires and show a scrollbar.
Try
<ScrollViewer ... ScrollViewer.HorizontalScrollBarVisibility="Disabled"/>
and
<ListView ... ScrollViewer.HorizontalScrollBarVisibility="Disabled"/>
although I'm not sure you even need the ScrollViewer.
You would probably be better off using a ListBox and an ItemTemplate instead of the ListView and user control
A window has a Grid with two columns. The left column contains a control with a constant width but with a height that adapts. The right column contains a TextBox that takes up all remaining space in the Grid (and thereby in the Window).
The Grid is given a minimal width and height and is wrapped within a ScrollViewer. If the user resizes the window to be smaller than the minimal width/height of the Grid, scrollbars are displayed.
This is exactly how I want it to be. However, a problem occurs when the user starts typing text. If the text is to long to fit in one line in the TextBox, I want the text to wrap. Therefore I set TextWrapping="Wrap" on the TextBox. But since the TextBox has an automatic width and is wrapped in a ScrollViewer (its actually the whole Grid that is wrapped), the TextBox just keeps expanding to the right.
I do want the TextBox to expand if the window is expanded, but I don't want the TextBox to expand by the text. Rather the text should wrap inside the available TextBox. If the text don't fit within the TextBox height, a scrollbar should be displayed within the TextBox.
Is there a way to accomplish this?
Below is some code that shows my problem:
<Window x:Class="AdaptingTextBoxes.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="300" Width="400" Background="DarkCyan">
<Grid Margin="10" Name="LayoutRoot">
<ScrollViewer HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Auto">
<Grid MinWidth="300" MinHeight="200">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="auto" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<Button Grid.Column="0" Margin="0,0,10,0" Content="Button" Width="100" />
<TextBox Grid.Column="1" AcceptsReturn="True" TextWrapping="Wrap" ScrollViewer.HorizontalScrollBarVisibility="Disabled" ScrollViewer.VerticalScrollBarVisibility="Auto" />
</Grid>
</ScrollViewer>
</Grid>
</Window>
You could use an invisible border (its hacky but it works - its how I tend to sort out dynamic textbox sizes in Xaml):
<Border BorderThickness="0" x:Name="border" Grid.Column="1" Margin="0.5" />
<TextBox Grid.Column="1" AcceptsReturn="True" TextWrapping="Wrap" Width="{Binding ActualWidth, ElementName=border}" Height="{Binding ActualHeight, ElementName=border}" />
Have you tried setting the MaxWidth property on just the TextBox?
Edit after OP's comment
I would try getting rid of the ScrollViewer. The sizing used in the Grid's layout should take care of re-sizing and the scroll bar settings on the TextBox should take care of the rest.
The answer is based on Leom's answer.
The solution works great when you enlarge the window, but the resizing is not smooth when you make the window smaller. As the textbox participates in the grid's layout, it has to perform layout process multiple times. You can fix that by putting the texbox in the canvas, so the change of the size of the textbox no longer triggers the grid's re-layout.
The updated code:
<Border BorderThickness="0" x:Name="border" Grid.Column="1" Margin="0.5" />
<Canvas Grid.Column="1">
<TextBox AcceptsReturn="True" TextWrapping="Wrap" Width="{Binding ActualWidth, ElementName=border}" Height="{Binding ActualHeight, ElementName=border}" />
</Canvas>