I have a list of controls, put into a stackpanel. These controls are Hubtiles, that are added programatically after a user creates it - a list essentially. I need to make the StackPanel in which they are added, scrollable - what would be the best approach for this? Should i put the stackpanel inside a ScrollView, and then increase the StackPanels height with the actual height of the Hubtile - to make it scrollable, but not so that the user can scroll infinite without something being there. So whenever the amount of controls inside the StackPanel reaches 3, it'll automatically increase it's height like this:
Whenever the amount of controls inside the StackPanel reaches 3 or above:
StackPanel.Height = StackPanel.Height + Hubtile.ActualHeight;
Thanks a lot!
Just put the StackPanel into ScrollViewer, set the StackPanel.VerticalAlignment to Stretch and set fixed size to the parent ScrollViewer. This is necessary - the ScrollViewer must know its size, to show the scrollbars for the inner content when the inner content is too long.
Related
I have a ListBox with horizontal orientation inside a ScrollViewer. When the list grows, it automatically scrolls to the last element. The scrollbars work, however must be disabled for this. I need to have separate buttons which would scroll the ScrollViewer by a predetermined iteration (much like buttons on the scrollbars). For this, I have tried:
sv.ScrollToHorizontalOffset(sv.HorizontalOffset + 20);
However, the ScrollViewer's HorizontalOffset seems to always be 0, and the method doesn't do anything with any values.
sv.LineRight();
sv.LineLeft();
both don't work, probably because the only child element is the ListBox.
If I change the ListBox's orientation to vertical, then the ScrollViewer's VerticalOffset changes with scrolling/adding new elements, and ScrollToVerticalOffset works correctly. Why is this different with horizontal orientation? Any other solutions?
Note: this was done without using XAML to place the controls.
To make this work, you need to do a couple things:
Remove the outer ScrollViewer and just use the ScrollViewer that is built into the ListBox.
On the ListBox set the following properties:
ScrollViewer.CanContentScroll="False"
This will make the HorizontalOffset property work in pixels. When it is set to True it works in items.
ScrollViewer.HorizontalScrollBarVisibility="Hidden"
This will keep scrolling active but will hide the scrollbar.
In your code you can get the ScrollViewer of the ListBox like so. In this example my ListBox is named x:Name="ListBox".
var scrollViewer = ListBox.FindChildByType<ScrollViewer>();
Finally, you can set the offset like below. In my sample, I created a method and passed in a value from my button click event handlers.
private void ScrollHorizontally(double offset)
{
var scrollViewer = ListBox.FindChildByType<ScrollViewer>();
scrollViewer?.ScrollToHorizontalOffset(scrollViewer.HorizontalOffset + offset);
}
I'm creating a Windows 8 Metro app. I have a TextBlock in a ScrollViewer. I'm wondering if it possible to programmatically change the ZoomFactor of the ScrollViewer to make the TextBlock auto-fit the width of the screen. Meaning, the longest line of the TextBlock fit the screen width (without wrapping).
Generally I find ViewBox to be the most useful way to scale xaml contents to fit a predetermined size. Simply leave your ScrollViewer and TextBlock with no size requirements (and turn wrapping off) and then put the ScrollViewer inside a ViewBox with Scale=Uniform (or possibly UniformToFit depending on your needs).
The TextBlock will cause the ScrollViewer to size appropriately for its contents, and then the ViewBox will scale the ScrollViewer to exactly fit in its own control extents. (Putting the ViewBox inside your root grid or as the root control of your page should cause it to fill the entire screen.)
I am dynamically creating data grids in a tab window in WPF. I am having an issue with the data grid sizes, that are within the tabControl.
This is not an issue of the size of data within the data grid but the size of data grid itself.
I am looking to set the height and width to auto. This is simple in XAML but I am struggling to find any information to do it in the code which I need to do..
I have tired double.NaN but this does not seem to work....
Any help would be amazing!
I am using c#.
Try
Height = new GridLength(1, GridUnitType.Auto);
The problem is probably the StackPanel. It won't give the controls inside of it any more space than they "need" in the direction of it's orientation (so a vertical stack panel will only give the minimum required vertical space to each element). Try replacing it with a Grid or DockPanel.
In other words - controls in a vertical StackPanel will NOT expand to fill available vertical space, similarly for a horizontal StackPanel.
I have a ListView in WPF that is resizing my entire application window whenever I add items to it. I have the ListView size bound to the grid it is in, which is bound to the window size. So when the user resizes the window, the ListView grows. The problem is that when I add items to the ListView, it automatically stretches to try to fit the new content, which in turn stretches the size of the entire window.
Is there anyway to prevent this behavior from happening?
Change SizeToContent of your window to Manual or Width (no Height should be there). This would prevent window itself from changing its height automatically according to content.
You want to set the VerticalAlignment property to 'Stretch'. If necessary, in the parent control too, and so on, until you are in the Window control.
The caveat is that if one of the controls on the way up is a StackPanel, it will not stretch to fit, but ALWAYS expand to accommodate its content. So stay away from StackPanels, use Stretch, and you're set!
Remove your Bindings too, they are likely TwoWay: So the listview increasing its size is making your Window grow!
Hope that helps!
You can use the following code.
First get the value of listview onload. Then store it in a variable, then do this code in the ColumnWidthChanging event property like this:
e.cancel = true;
e.NewWidth = // the declared variable in which you store the list view with value in the onload function of the form
int a = 100;
e.cancel =true;
e.NewWidth = a;
Have you tried setting the MaxWidth property?
You can set the MaxHeight property for your ListView in your xaml, no?
10 years later...
Put the ListView inside a flexible control which resizes as you resize the window, for example, a Border. This way, when the Window resizes, the Border resizes, and when the Border resizes, the ListView resizes.
Bind the MaxHeight property of the ListView to the ActualHeight property of the Border. This way, the ListView cannot resize the Border.
For details on how to achieve this, see this answer (to a practically duplicate question which is also about 10 years old): https://stackoverflow.com/a/68498797/773113
i have 3 custom controls, that i want to place in a resizable window next to each other. when the window is being resized, these controls should also resize, each taking 33% of the available width.
i tried to use a table layout, but it seems the table only grows, but never shrinks.
thanks for any help on this!
You can use a TableLayoutPanel, with 3 columns each of size "33% percent". Then you put each of your control in the panel, and set the anchor property as you wish (for example right-left if your control should resize themselves only on the horizontal plane).
Your TableLayoutPanel should also have its property Dock set to True so that he can occupy all your window and resize accordingly.