Questions tagged [visualtreehelper]
92 questions
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vote
3 answers
VisualTreeHelper not finding children of DependencyObject, How can I reliably find objects?
I have a UserControl called ZoneContainer. This has a property that which contains a ListBox containing a number of ListItems. Each ListItem contains a DockPanel.
I'm trying to use a the following code to find the children that exist inside…
DaveDev
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1 answer
VisualCollection to Visual HitTest invisible?
I am working with VisualCollection, Visual and HitTest in WPF and encountered a problem.
I tried to make a custom visual drawing as follows:
public class MyDrawing : Visual
{
VisualCollection vc;
public MyDrawing()
{
vc = new…
user1184598
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Getting child properties in WPF Using VisualTreeHelper not returning values
Once I use visualTreeHelper.getchild to find a child object, how would I get the name of that object, or even other properties of the object like width or height?
i.e.
This doesnt work:
For i As Integer = 0 To VisualTreeHelper.GetChildrenCount(Can1)…
SDanks
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0 answers
How can I perform a Hit Test on one specifc 3d object in WPF?
I have a SphereMesh (inherits from MeshGeneratorBase as part of the Petzold.Media3D.dll) in my WPF 3D Scene. I also have thousands of ScreenSpaceLines3D objects on that sphere. I want to ignore everything in my scene except the SphereMesh and find…
Ryan R
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0
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1 answer
"VisualTreeHelper.GetDescendantBounds()" returns Infinity
Why does the VisualTreeHelper.GetDescendantBounds(SomeVisualItem) method return (-Infinity,-Infinity,Infinity,Infinity)?
The SomeVisualItem's Canvas.Left, Canvas.Top, Width, ... are explicitly assigned.
Ali Adlavaran
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2 answers
If the DataTemplate is nested in another Datatemplate it's hard the binding with a father-template property
Have youI know that the problem has been many times discussed in the web. But mine is a particular case and I still haven't found the right solution.
Scenario: Silverlight 4 - A TreeView with data showed by two HierarchicalDataTemplate, one to show…
lamarmora
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What causes VisualTreeHelper::HitTest to return incomplete results, and sometimes no results?
I had a scenario where I was connecting to a Windows WPF app, through a network connection to drive UI for the purposes of test automation.
Sometimes my requests to the UI using VisualTreeHelper returned no results regardless of the apparent state…
Bulmaro
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1 answer
Silverlight 4 - Visual Tree helper returns 0 child Elements?
I have the following code that is supposed to find an element inside of something. The problem is that I have a DataGrid, whose first column has a CheckBox in it's header. The checkbox itself is defined in a Style, which exists in the…
bleepzter
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WPF 3.5 nested datagrid row details not showing in Visual Tree
So I build a nice nested datagrid that look something like this:
asuciu
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1 answer
UWP VisualTreeHelper Wrong Parameter Reference
I want to modify the content in a TabItem of a TabView. And that TabItem uses DataTemplate.
When I am trying to access the children of that item like the following:
var container = tabview.ContainerFromIndex(tabview.SelectedIndex);
…
Seaky Lone
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0
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1 answer
WPF ViewBox blocks VisualTreeHelper search
I have tried this Navigation Service approach (View First) for MVVM-Light WPF
https://stackoverflow.com/a/28968560/5272185
I realized that the VisualTreeHelper search for the Frame element does not find the Frame if the Frame is located inside a…
Johan
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1 answer
How to make method, that finds sepcific type of child user control, more generic?
I have some few cases in my WPF application that requires me to find a specific type of user control in a given user control. For example I'm having the following method that already works nicely:
public static System.Windows.Controls.CheckBox…
Ralf
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0
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2 answers
VisualTreeHelper doesn't find control in DataGridTemplateColumn.CellTemplate
I use this method to list all the buttons of a usercontrol:
private static IEnumerable FindVisualChildren(DependencyObject depObj) where T : DependencyObject
{
if (depObj != null)
{
int NbChild =…
Marc
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0
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1 answer
How to convert a DependencyObject into an AutomationElement?
I am traversing a WPF application through its VisualTree, using the VisualTreeHelper, which is returning DependencyObjects.
for(int i = 0; i < VisualTreeHelper.GetChildrenCount(rootObject); i++) {
var child =…
Olian04
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0
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2 answers
VisualTreeHelper.GetDescendantBounds returns 'Empty' (Infinity)
In my WPF app I dynamically load a XAML drawing from XML at runtime. This drawing is a complex series of nested canvas and geometry 'Path's (for example):
JohnKoz
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