I bind ItemsSource property to collection of elements that have 'IsChecked' property. How to bind 'RadTreeViewItem.IsChecked' property to 'MyElement.IsChecked'?
It is needed because I set IsVirtualizing="True" and thus I have to store whether item is checked in separate place.
Hello Roman,
You can use the
ItemContainerStyle
property of the
RadTreeView
and set a style targeting
RadTreeViewItem
. You can examine
this article showing how to bind the
IsSelected
property. Binding the
IsChecked
should be the same. Feel free to ask if you need further assistance.
Regards,
Petar Mladenov
the Telerik team
Browse the
videos here>>
to help you get started with RadControls for WPF
<
t:RadTreeView.ItemContainerStyle
>
<
Style
TargetType
=
"t:RadTreeViewItem"
>
<
Setter
Property
=
"IsChecked"
Value
=
"{Binding Path=IsChecked, Mode=TwoWay}"
/>
</
Style
>
</
t:RadTreeView.ItemContainerStyle
>
But bindings seems to work only one way. Also when I set
IsVirtualizing="True" t:TreeViewPanel.VirtualizationMode="Recycling"
Properties binding works only for visible elements, when I scroll down all new elements are unchecked.
Here is full XAML code:
<
Window
x:Class
=
"WpfApplication4.MainWindow"
Title
=
"MainWindow"
Height
=
"350"
Width
=
"525"
>
<
DockPanel
>
<
StackPanel
Orientation
=
"Horizontal"
DockPanel.Dock
=
"Top"
>
<
Button
Content
=
"Check All"
Click
=
"CheckAll_Click"
Margin
=
"6"
Padding
=
"4, 0"
/>
<
Button
Content
=
"Uncheck All"
Click
=
"UncheckAll_Click"
Margin
=
"6"
Padding
=
"4, 0"
/>
<
Button
Content
=
"Count"
Click
=
"Count_Click"
Margin
=
"6"
Padding
=
"4, 0"
/>
<
TextBlock
Name
=
"label"
Text
=
"Count"
VerticalAlignment
=
"Center"
/>
</
StackPanel
>
<
t:RadTreeView
x:Name
=
"tree"
IsOptionElementsEnabled
=
"True"
ItemsOptionListType
=
"CheckList"
IsVirtualizing
=
"True"
t:TreeViewPanel.VirtualizationMode
=
"Recycling"
>
<!--t:RadTreeView x:Name="tree" IsOptionElementsEnabled="True" ItemsOptionListType="CheckList"-->
<
t:RadTreeView.ItemContainerStyle
>
<
Style
TargetType
=
"t:RadTreeViewItem"
>
<
Setter
Property
=
"IsChecked"
Value
=
"{Binding Path=IsChecked, Mode=TwoWay}"
/>
</
Style
>
</
t:RadTreeView.ItemContainerStyle
>
</
t:RadTreeView
>
</
DockPanel
>
</
Window
>
And backing code:
using
System;
using
System.Linq;
using
System.Windows;
using
System.Collections.ObjectModel;
using
System.ComponentModel;
namespace
WpfApplication4
public
partial
class
MainWindow : Window
ObservableCollection<MyItem> list =
new
ObservableCollection<MyItem>();
public
MainWindow()
InitializeComponent();
for
(
int
i = 0; i < 100; i++)
list.Add(
new
MyItem() { Text =
"item "
+ i, IsChecked =
false
});
tree.ItemsSource = list;
private
void
CheckAll_Click(
object
sender, RoutedEventArgs e)
foreach
(var item
in
list)
item.IsChecked =
true
;
private
void
UncheckAll_Click(
object
sender, RoutedEventArgs e)
foreach
(var item
in
list)
item.IsChecked =
false
;
private
void
Count_Click(
object
sender, RoutedEventArgs e)
label.Text = list.Where(a => a.IsChecked).Count().ToString();
public
class
MyItem : INotifyPropertyChanged
public
event
PropertyChangedEventHandler PropertyChanged;
public
string
Text {
get
;
set
; }
private
bool
isChecked;
public
bool
IsChecked
get
{
return
isChecked; }
isChecked = value;
if
(PropertyChanged !=
null
) PropertyChanged(
this
,
new
PropertyChangedEventArgs(
"IsChecked"
));
public
override
string
ToString()
return
Text;
Hello Roman,
Unfortunately this appears to be a bug in the
RadTreeView
. The good new is that there is an elegant workaround using converter and
CheckState
property of the
RadTreeViewItem
. You can check out this
blog post
for more info and examine the attached solution accordingly.
You can also track the progress and vote the
issue you`ve encountered here.
I also updated your telerik points.
Feel free to ask if you need further into.Thank you for your cooperation.
Best wishes,
Petar Mladenov
the Telerik team
Browse the
videos here>>
to help you get started with RadControls for WPF
We want to inform you, that this issue is already fixed.
You can check it in our latest internal build (released on 2 of May).
Any feedback/comments on the subject are highly appreciated.
Kind regards,
Vladislav
the Telerik team
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Explore the
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system and vote to affect the priority of the items
Hi @ll admins,
I am using Telerik for WPF (2016.1.112) and it seems the bug already exists.
Also: initially null is interpreted as false.
Best regards
Christian
Hi Christian,
There are known issues in the checkbox support for RadTreeView in a data binding scenario. This is why I recommend you to implement custom checkbox logic as demonstrated in the
Implement a Tri-State CheckBox logic using MVVM
help article. I hope this solution works for you.
Regards,
Martin
Telerik
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