I'm wanting to limit a Grid.ColumnDefinition to a maximum width but I do not know the width to do this programatically. Consider the following XAML:
<Grid MaxWidth="150" HorizontalAlignment="Left">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="Auto" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<TextBlock Grid.Column="0" Text="A" TextWrapping="Wrap" Background="LightGreen" />
<TextBlock Grid.Column="1" Text="B" TextWrapping="NoWrap" Background="LightSteelBlue" />
</Grid>
The Grid is 150px wide at most but can be less. The TextBlock in column 0 is Wrap. The TextBlock in column 1 is NoWrap. Background colors added simply for clarity. Result:
Now let's change the text:
<TextBlock Grid.Column="0" Text="I'm long but I wrap" TextWrapping="Wrap" Background="LightGreen" />
<TextBlock Grid.Column="1" Text="I'm a long single line" TextWrapping="NoWrap" Background="LightSteelBlue" />
Result:
The wrappable text does not wrap. Seems no feedback is provided from the Grid to the TextBlock. The behavior I want is for the Grid to realize that its columns being Auto have expanded past its own MaxWidth property and attempt to shrink the contents in the columns. The TextBlock that is NoWrap won't abide by this request while the TextBlock with Wrap would. Hence the output would be:
I can't figure out a way to do this with any * sizing since I don't want the grid to take this much space unless the contents are needed. Incidentally the actual Grid has many columns of many potential sizes. This is a shortened example.
[Edit]: My solution is a hack and I don't care for it, but it works. I created a property on my model which determines the content that can appear in other columns including images, margins, text, etc. Then it subtracts from the grid size to find a maximum width for a TextBlock which has Wrap set. Works just fine but is ugly as can be.
Although Auto does not work well for you, doing the * can work wonders. Instead of just a blind-eye to * for all other columns, you can do [a numeric value]*, like Width="120*" which will allocate the 120, but, if there is more room, it will get the rest.
Now, that said, if you have SOME columns that you know would be fixed, like some date field which is always 100 width, or some string type category of 1 character, maybe a fixed width of 10, but the rest are otherwise flexible. Just blend them something like
Width 100
Width 10
Width 500*
Width 250*
So, if your screen has available width of 1200, columns 1 and 2 will remain at their fixed widths. However, the 500* and 250* will get their baseline width and then equally split the remaining width between them. The more "*"-based columns to split the widths, they all split the available space.
Have you tried doing something like that?
Related
I've got a grid with 3 columns: the first has its Width set to "*", which I have been led to believe will make it fill up any remaining space left by the other columns. The second has a width of 8, and the third's Width is set to "Auto" so its size changes depending on its contents.
In my 2nd column I have a GridSplitter, so that when dragged I can change the width of both the first and third columns. This works fine, the issue is that I have a grid in my third column that, when toggled, will have its visibility set to collapsed. When collapsed, I need the first column to fill all of the remaining space. I tried to do this many ways:
Set HorizontalAlignment on first column to Stretch
Bound the Grid.Rowspan of the first column to the visibility of the third one, so that when when hidden the Rowspan will change to 3 and, since its width is using "*", it should theoretically use all of the available space in all 3 columns.
The weird thing is that, if I do not resize the columns using the GridSplitter, then the first column will fill all remaining space properly. Yet after resizing, the first column will not budge. It's almost as if, when dragging the GridSplitter to resize the columns, WPF change the width of both columns to become absolute instead of their star and auto values, making it so they will not fill the space after a resize.
XAML Code (condensed) as requested:
<Grid Grid.Row="1">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="Auto"/>
</Grid.ColumnDefinitions>
<Grid x:Name="AssetListViewGrid" Grid.Column="0" Grid.RowSpan="{Binding Visibility, ElementName=AssetViewMetadataSplitter, Converter={StaticResource SplitterVisibilityToRowSpanConverter}}" Margin="0 4 0 4">
<!-- irrelevant code -->
</Grid>
<GridSplitter x:Name="AssetViewMetadataSplitter" Grid.Column="1" Opacity="0.8" HorizontalAlignment="Center" Width="6" Margin="3 5 1 5" ToolTip="Grab to resize" Visibility="{Binding IsChecked, ElementName=GridHeaderVisibilityToggleButton, Converter={StaticResource VisConverter}}"/>
<Grid x:Name="MetadataGrid" Margin="4 2 4 2" Grid.Column="2" DataContext="{Binding MetadataViewModel}" Visibility="{Binding IsChecked, ElementName=GridHeaderVisibilityToggleButton, Converter={StaticResource VisConverter}}">
<!-- irrelevant code -->
</Grid>
I just ran into this as well. In my app it seemed that a GridSplitter was in fact changing the width values to absolute instead of * also, so I'm guessing that is the behavior.
I ended up using code-behind to solve it. First, name column 1:
<ColumnDefinition Width="*" x:Name="Column1"/>
Then, add an event handler for when your MetadataGrid visibility changes, & call this code to reset Column1 to a * width to fill the rest:
Column1.Width = new GridLength(1, GridUnitType.Star);
You might also try doing something in the XAML with style triggers to reset the Column1 width to * based on the MetadataGrid's visibility state. My case was much more complex with custom sizes & varied conditions & expanders, so I used code-behind, so I'm not sure if xaml triggers would work for yoU or not . Hopefully that helps though.
I solved it by adding empty 10000X1000 rectangle inside it
<Grid Grid.Row="1" Grid.Column="1" Height="auto" HorizontalAlignment="Left" SizeChanged="Grid_SizeChanged">
<Image x:Name="currentImage" Height="auto" Width="auto" />
<Rectangle Width="10000" Height="10000" ></Rectangle>
<Canvas x:Name="currentImageOverLay"/>`</Grid>
This time, my question is as simple as it sounds... how do you get text to wrap in a WPF TreeViewItem?
I have a simple HierarchicalDataTemplate with just one TextBlock in it.
<TextBlock Text="{Binding Value}" TextWrapping="Wrap" />
The text does not wrap.
I tried binding the Width of the TextBlock to the ActualWidth of the TreeView, but although that makes the text wrap, the Width of the TreeViewItem does not fit in the TreeView because the TreeView has Padding. Binding to the ActualWidth of the TreeViewItem has (unsurprisingly) the same effect. Another downside to this is that even the items with little text stretch outside the TreeView bounds.
<TextBlock Text="{Binding Value}" TextWrapping="Wrap" Width="{Binding ActualWidth,
ElementName=TreeView}" />
Surely there must be a better way, like somehow informing the TreeViewItem of the TreeView's bounds... I can't believe it doesn't know automatically. But how can I do this?
UPDATE >>>
Thanks to H.B.'s answer, I managed to change the Grid.ColumnSpan to 2 on the Bd Border he mentioned in the ControlTemplate and it set the width so that the text now wraps nicely. The problem is that I am using this ControlTemplate for other TreeViewItems in other TreeViews where I don't want full width items.
The solution I came up with is simple. I have bound the TreeViewItem.Tag value to the Grid.ColumnSpan property in the ControlTemplate like so:
<Border Grid.ColumnSpan="{Binding Tag, RelativeSource={RelativeSource TemplatedParent}}"
Name="Bd" Grid.Column="1" ... />
This allows me to change the Grid.ColumnSpan and therefore the full width or ordinary width behaviour of the TreeViewItem by setting the TreeViewItem.Tag value to either 2 or 1 respectively.
If you look at the default template of TreeViewItems you will see a Grid like this:
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition MinWidth="19"
Width="Auto"/>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<!-- ... -->
As you can see the third column takes all available space while the others are on Auto, the header is placed in the second column inside a border:
<Border Name="Bd"
Grid.Column="1"
...
This means that the column will become as large as the header, there is no restriction on it. Thus the header just gets bigger than the TreeView itself.
If you add Grid.ColumnSpan="2" to this Border it will occupy the third column as well, which is restricted by how much space is left, hence the text will wrap; this will however extend the header across the whole width which might look a bit odd when selecting it.
Of course you will also need to disable horizontal scrolling:
<TreeView ScrollViewer.HorizontalScrollBarVisibility="Disabled" ...
I have the following xaml:
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="150"/>
<ColumnDefinition/>
<ColumnDefinition/>
</Grid.ColumnDefinitions>
<StackPanel Orientation="Horizontal" HorizontalAlignment="Left" Grid.Column="1">
<TextBox Width="120" Text="Search" Margin="10"/>
<Button>Search</Button>
</StackPanel>
</Grid>
In both the designer and the running application the right edge of the button is cut off, but only if the textbox has a margin on the right side. How do I create separation between the two without cutting off the buttton. Is this a bug?
Edit:
The StackPanel is in Column 1 not Column 0. Additionally, the button border reappears after the button has been clicked. Window size is 525 and the grid is the only thing in it.
Set your first ColumnDefintion's Width to Auto
I'm guessing that since the width is not defined, it's making them both *, which means they'll be of an equal width. By setting the 1st to Auto you're telling it to take up however much space it needs, then letting the 2nd column fill the remaining space.
It isn't a bug- the combination of the 120px of width (of the text box) + the width of the button when it's contents is the string "Search" (whatever that may be) + the 150px of the first column is wider than whatever is the space allocated by the container of the Grid.
What did you expect to happen? Scrollbars?
I am building a ListView that needs to have five columns - the first one needs to have text that can be any length and needs to wrap whenever the window size changes (in addition to changing the row height so the wrapped text is visible) and the other four columns are a static width of 45. I've been searching for hours on this and every solution I come across either requires a static width or doesn't work.
Solutions tried:
Column widths of auto, 1*, 2*, etc. (settings ignored)
DockPanel (settings ignored)
WrapPanel (ignored)
Setting Width to RelativeSource of parent for ActualWidth (ignored)
Any ideas? It seems like a significant number of people have had this same problem, but I would highly prefer to not have to go the static width route for this column. Especially since the content just gets cut off when I do that anyway (even with height="Auto" for the row). The width of the overall window could be as small as 1024, but could also be 1600+ which is why I want dynamic sizing. That way smaller screens will have the content wrap and larger screens will just show the one line since the content fits.
Here is the XAML:
<ListView.ItemTemplate>
<DataTemplate>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition />
<ColumnDefinition Width="45" />
<ColumnDefinition Width="45" />
<ColumnDefinition Width="45" />
<ColumnDefinition Width="45" />
</Grid.ColumnDefinitions>
<!-- This is the TextBlock that needs to wrap its content (and
change the height of the row (so the full content is still
visible) to whatever the available space is, but should not
make overall ListView wider than the parent's width. -->
<TextBlock Text="{Binding Content}" Padding="20,6,6,6" />
<!-- These four blocks will have other content eventually, but only need
to be 45 wide -->
<TextBlock Text="X" Grid.Column="1" HorizontalAlignment="Center" />
<TextBlock Text="X" Grid.Column="2" HorizontalAlignment="Center" />
<TextBlock Text="X" Grid.Column="3" HorizontalAlignment="Center" />
<TextBlock Text="X" Grid.Column="4" HorizontalAlignment="Center" />
</Grid>
</DataTemplate>
</ListView.ItemTemplate>
Not so easy...but it can be done.
I wrote a solution for you. In short, use Expression Blend to create a copy of the ListView Template and delete the ScrollViewer surrounding the ItemPresenter.
Here is a more indepth explanation:
How to have the TextBlock in a left column of a Grid in a ListView Template expand or shrink with text wrapping?
<ListView HorizontalContentAlignment="Stretch" ScrollViewer.HorizontalScrollBarVisibility="Disabled">
<ListView.ItemTemplate>
...
</ListView.ItemTemplate>
</ListView>
I'd add TextWrapping="Wrap" to the first TextBlock element.
If there's a TextBlock inside a Grid, what's the best way (performance wise) to set its width and height?
Is setting them in the TextBlock's properties will be better than setting it as Grid's properties?
basically what I'm asking is which one of the following is better :
<Grid Width="200" Height="200">
<TextBlock />
</Grid>
vs
<Grid>
<TextBlock Width="200" Height="200"/>
</Grid>
<Grid Width="200" Height="200">
<TextBlock />
</Grid>
Using a Grid purely to constrain a TextBox is not really a good way to set the width of the TextBox. A Grid is more for laying out multiple controls. However this is perfectly acceptable:
<Grid Width="200" Height="200">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="200" />
<ColumnDefinition Width="1*" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<TextBlock Grid.Column="1" HorizontalAlignment="Stretch" Margin="5,0" />
</Grid>
This is along the same lines as what #Ahmed suggested.
Generally with a XAML layout the recommendation is to use a proportional layout rather than fixed sizes, so that your UI can be resized correctly with minimal oversight from any of your code. This means it is good to let the parent element dictate the size as much as possible, only used fixed sizes where you must. (Setting MinWidth/MaxWidth/etc is fine, just try to avoid explicitly setting Width where possible, the same goes for the Height properties).
I Really don't understand specifically what you are asking about !
But I really like to set my Grid to be stretched as Window and set my TextBox Width & Height to Auto Or NAN ,, then define special margins & alignments to my Textbox
In the Layout System article on MSDN there is a small section on performance but there is also a dedicated article on optimizing performance of the layout and design. Maybe there is something helpful in there.
It seems to me that this documentation does not make any claims about this issue though, it probably does not matter or the difference is negligibly small.
I don't have any stats to back this up but since WPF's rendering/layout engine works by first measuring the child elements of everything, one would assume if you manually define the size of a child element it would have a marginal effect.
In this scenario, if all you're doing is wrapping a single TextBlock element, you might be better off using something like a <Border>. If there's multiple elements, see if you can use a <StackPanel>.