I have a menu inside the grid with on item:
I want to change the horizontal and vertical alignment of this MenuItem to fit the entire grid cell.
I wrote this:
<Menu>
<MenuItem Header="Hello" HorizontalAlignment="Stretch" VerticalAlignment="Stretch"/>
</Menu>
But it stays as before:
I even tried to change the HorizontalAlignment to Center and it's still the same.
How do I accomplish this?
Note: the menu itself is stretched by default - you can see that because of the background color.
update
I need to support subItems. if I only put MenuItem without a Menu opening of sub items is not working.
If you only have single MenuItem and want it to fill the parent panel, you don't need a Menu. This should work:
<Grid Width="200" Height="200">
<MenuItem Header="Hello" HorizontalAlignment="Stretch" VerticalAlignment="Stretch"/>
</Grid>
If you have a Menu that may contain several items, it doesn't make much sense for a single item to fill the available space.
Related
I`m trying to have a dropdown menu under a split button. Some of these menuItems should have sub-menu items. If you want an example, click on the bookmark button in Firefox (top right).
I can't use Menu, because that is always oriented horizontally. So I went with a stackpanel:
<Window x:Class="WpfApplication3.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:xctk="http://schemas.xceed.com/wpf/xaml/toolkit"
Title="MainWindow" Height="350" Width="525">
<Grid>
<xctk:SplitButton Content="SplitButton" BorderThickness="1" BorderBrush="Black" Margin="0,0,408,290">
<xctk:SplitButton.DropDownContent>
<StackPanel Width="161" HorizontalAlignment="Left">
<MenuItem Header="MenuItem1" HorizontalAlignment="Left" Width="517">
<MenuItem.Items>
<MenuItem Header="submenuItem1"/>
<MenuItem Header="submenuItem2"/>
</MenuItem.Items>
</MenuItem>
<MenuItem Header="MenuItem2"/>
<MenuItem Header="MenuItem3"/>
</StackPanel>
</xctk:SplitButton.DropDownContent>
</xctk:SplitButton>
</Grid>
Problem here is that the sub menu items don't show up. They don't even have the little arrows next to them. You can do this without the SplitButton, just leaving the stackpanel and everything in it, you'll have the same problem. I've tried putting the parent Menu item in its own tag, but I want the sub-menu items to appear to the right of their parent (just like the firefox example: Assuming your firefox window is not maximized, and you've allowed enough screen-space for the item to appear).
the way you're using the MenuItem control is wrong, it is meant to be hosted inside the Menu control or another MenuItem.
As for the solution to your problem, there are two. the first one is to write a custom control that reuses the ContextMenu to host the menu items, you will write something like this:
<m:SplitButton Content="Split Button" Placement="Bottom">
<MenuItem Header="MenuItem 1"/>
<MenuItem Header="MenuItem 2">
<MenuItem Header="MenuItem 1"/>
<MenuItem Header="MenuItem 2"/>
</MenuItem>
</m:SplitButton
http://www.codeproject.com/Articles/20612/A-WPF-SplitButton
the second approach is to host the Menu control inside the DropDownContent and re-style everything, there will be a lot of xaml markup.
the Menu control will be easy to re-style, the only thing you need to do is make sure that menu items are displayed vertically instead of horizontally, using the following markup:
<Style TargetType="Menu">
<Setter Property="ItemsPanel">
<Setter.Value>
<ItemsPanelTemplate>
<StackPanel Orientation="Vertical" IsItemsHost="True" />
</ItemsPanelTemplate>
</Setter.Value>
</Setter>
</Style>
the hardest part is styling the MenuItems, they are styled based on their Role property. It can have four possible values:
TopLevelHeader : direct child of Menu with sub-menu items.
TopLevelItem : direct child of Menu without sub-menu items.
SubmenuHeader : direct child of MenuItem with sub-menu items.
SubmenuItem : direct child of MenuItem without sub-menu items.
Regards
What is the difference between:
HorizontalAlignment="Stretch"
HorizontalContentAlignment="Stretch"
in a textbox in WPF?
Sample example:
<TextBox HorizontalAlignment="Stretch"
HorizontalContentAlignment="Stretch"
Height="100"
TextWrapping="Wrap"
AcceptsReturn="True"
></TextBox>
HorizontalAlignment and VerticalAlignment determine the alignment of the control itself with respect to its parent control.
HorizontalContentAlignment and VerticalContentAlignment determine the controls content alignment with respect to the control.
For example consider a common Button control
<Button x:Name="aButton" Width="50" Height="25" />
Here you somehow have to specify how this control is aligned within it's parent control. A suitable parent control could be a StackPanel, a Grid, a WrapPanel etc.
For both Horizontal- and VerticalAlignment you can chose between the options Left, Right, Center and Stretch. The first three options respect the buttons width and height whereas the last option tries to stretch the button into the direction specified ignoring the set width or height:
The code
<StackPanel Orientation="Horizontal">
<Button x:Name="aButton" Width="50" Height="25" HorizontalAlignment="Right" />
</StackPanel>
for example would place the Button inside the StackPanel and align it inside at the left.
HorizontalContentAlignment and VerticalContentAlignment aligns the content of the control. The content is special UIControl that is build into the control which you can simply exploit by taking a look into the ControlTemplate of a ContentControl. Note that we are talking especially about ContenControls which are acting as a container that is capable of taking exactly one object to 'carry' inside and display - its content.
So HorizontalContentAlignment and VerticalContentAlignment are determining the alignment of this content with respect to its container. In the case of a initially created Button the buttons content is its caption and with the two properties in question you are aligning this caption inside the Buttons borders which is again either one of these: Left, Right, Center, Stretch.
HorizontalAlignment will align your textbox in relation to its containing parent whereas HorizontalContentAlignment will align the text of your textbox in relation to itself.
HorizontalContentAlignment and VerticalContentAlignment are used with Content Controls which apply these to its content. For example in the following code the Content Control Button will align its content(which is a string in this case and can be any arbitrary object) to center.
HorizontalAlignment and VerticalAlignment are used with child elements when these are inside a Panel. Panel will arrange its children based on these properties of child elements.
In the following code the Panel (StackPanel) will align its child (Button) to right.
<StackPanel>
<Button Content="OK"
HorizontalContentAlignment="Center" VerticalContentAlignment="Center"
HorizontalAlignment="Right" VerticalAlignment="Top" />
</StackPanel>
I'm presenting text in a wpf TextBlock control (.Net 3.5). The content of the textblock varies depending on what the user selects in a list box. The text wraps, so I don't need an horizontal scroll bar. However, there is often more text than the amount the window can display, so I need a vertical scroll bar.
As I started searching I quickly found that the answer is to wrap the TextBlock in a ScrollViewer. However, It Does Not Work (TM) and I'm hoping someone can help me work out why.
This is the structure of the UI code:
<Window x:Class=..>
<StackPanel>
<ListBox HorizontalAlignment="Stretch"
VerticalAlignment="Top" Height="200"
SelectionChanged="listbox_changed" SelectionMode="Single">
</ListBox>
<Button Click="Select_clicked">Select</Button>
<ScrollViewer VerticalScrollBarVisibility="Auto">
<TextBlock Name="textblock" TextWrapping="Wrap"/>
</ScrollViewer>
</StackPanel>
</Window>
When the user selects an item in the list box, some text associated with this item is presented in the TextBlock. I would have thought that the code as it stands should have been all that's required, but it never provides me with a scroll bar.
Searching and experimenting have given me two clues: the root of the problem might be related to me updating the content of the TextBlock dynamically, and that the TextBlock does not resize itself based on the new content. I found a posting that seemed relevant that said that by setting the Height of the TextBlock to its ActualHeight (after having changed its content), it would work. But it didn't (I can see no effect of this).
Second, if I set the height (during design time) of the ScrollViewer, then I do get a vertical scroll bar. For instance, if I set it to 300 in the xaml above, the result is almost good in that the window as first opened contains a TextBlock with a vertical scroll bar when (and only when) I need it. But if I make the window larger (resizing it with the mouse during runtime), the ScrollViewer does not exploit the new window size and instead keeps its height as per the xaml which of course won't do.
Hopefully, I've just overlooked something obvious..
Thanks!
Because your ScrollViewer is in a StackPanel it will be given as much vertical space as it needs to display it's content.
You would need to use a parent panel that restricts the vertical space, like DockPanel or Grid.
<DockPanel>
<ListBox DockPanel.Dock="Top" HorizontalAlignment="Stretch"
VerticalAlignment="Top" Height="200"
SelectionChanged="listbox_changed" SelectionMode="Single">
</ListBox>
<Button DockPanel.Dock="Top" Click="Select_clicked">Select</Button>
<ScrollViewer VerticalScrollBarVisibility="Auto">
<TextBlock Name="textblock" TextWrapping="Wrap"/>
</ScrollViewer>
</DockPanel>
Simple, yet frustrating issue here...
I have a PopUp control.
It is contained in side a Grid, which has a Grid.Clip defined.
The PopUp is still visible outside the Grid's clipped area.
i.e.
<Grid Background="Red" Width="150" Height="150">
<Grid.Clip>
<RectangleGeometry Rect="0,0,150,150" />
</Grid.Clip>
<Popup IsOpen="True" Margin="100,100,0,0">
<Grid Background="Green" Width="150" Height="150" />
</Popup>
</Grid>
Ideally, the green box should not appear or "bleed" outside of the red box. The problem is that it is contained within a PopUp, and so it bleeds. How can I modify this (without removing the PopUp control) so that the PopUp does not bleed outside of it's containing control?
Popup works differently. It "ignores" its parent and it is added directly into visual root of your app. This is how it can be on-top of everything.
So now it depends on what are you trying to do. I think popup is not suitable for this scenario.
You can try to clip the popup in its template, but I feel that's not what you want.
I have a ListBox that displays a list of WPF controls.
My problem is that the vertical scrollbar is show but is disabled even when there are enough items that the ListBox should be scrollable.
One other possibly relevant fact is that this is contained in an Integration.ElementHost.
WPF noobie, Jim
Here is the XAML for the ListBox:
// for brevity I removed the Margin and Tooltip attributes
<Grid x:Class="Xyzzy.NoteListDisplay"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<StackPanel Name="stackPanel" Orientation="Vertical"
ScrollViewer.VerticalScrollBarVisibility="Visible">
<StackPanel Orientation="Horizontal">
<CheckBox Name="AllRecent" IsChecked="False" >View All Recent</CheckBox>
<CheckBox Name="AscendingOrder" IsChecked="False">Descending Order</CheckBox>
<Button Name="btnTextCopy" Click="btnCopyText_Click">Copy All</Button>
</StackPanel>
<ListBox Name="NoteList"
ScrollViewer.CanContentScroll="True"
ScrollViewer.VerticalScrollBarVisibility="Visible">
</ListBox>
</StackPanel>
</Grid>
And the XAML for the control displayed in each ListBox item:
<UserControl x:Class="Xyzzy.NoteDisplay"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<Grid>
<StackPanel Orientation="Vertical">
<StackPanel Orientation="Horizontal">
<TextBlock Name="Heading" FontSize="10">Note Heading</TextBlock>
<Button Name="btnCopyText" Height="20" FontSize="12"
Click="btnCopyText_Click">Copy
</Button>
</StackPanel>
<TextBlock Name="Body" FontSize="14">Note Body</TextBlock>
</StackPanel>
</Grid>
</UserControl>
I have had problems with scroll bar visibility when using a StackPanel. I think it is because the StackPanel is always as big as it needs to be to contain all of its children. Try reorganizing the layout to remove the StackPanel (use a Grid instead) and see if that helps.
You just need to introduce Height property, like this:
<ListBox Height="200"
Name="NoteList"
ScrollViewer.CanContentScroll="True"
ScrollViewer.VerticalScrollBarVisibility="Visible">
</ListBox>
Heya, I suspect what might be happening is that your ListBox is expanding enough for every item however the ListBox is actually disappearing off the bottom of the Containing Control.
Does the ListBox actually stop properly or does it just seem to disappear? Try setting a MaxHeight on the ListBox and see if that makes the scrollbar appear. You should be able to set the VerticalScrollBarVisibility to Auto to have it only appear when needed.
If the list box is inside a StackPanel, try these steps for your ListBox
Set ScrollViewer.VerticalScrollBarVisibility="Auto"
Setting the Height property of a ListBox to some height that you expect to see.
That should force the scroll bar to show up.
This is pretty late, but anyone using ListBox probably shouldn't have it in a StackPanel. Once I switched the parent control of my Listbox from StackPanel to DockPanel with LastChildFill=True (Where the listbox was the last control), my scrollbar worked perfectly.
Hope this helps someone who's problem was not solved by the above answer.
Another solution to this problem that works well is to put a ScrollViewer around the StackPanel.
Another solution with a modification to Dave's is to use the ScrollViewer only. You only be able to scroll by placing your mouse on the ScrollView's ScrollBar. I use it this way because I don't like how ListBox jumps from item to item and sometimes missing items from the Top. Little bit hard on the eyes too. I like ScrollViewer's smooth scrolling.
I just ran into the same issue, and here's a little code demo on code project that visually shows it.
(If you want to save yourself the time of writing the code to see the differences yourself :) )
http://www.codeproject.com/Tips/659066/ListBox-and-Panels-in-WPF