Re: Assign a context to a UI Element - WPF Discussion Boards

21-Jan-11 0:57

The usual way is not to work against the rows, but rather to work against the underlying data. With Silverlight and WPF it pays to stop thinking in the old ways of doing things, and embrace the rich databinding support along with a pattern such as MVVM.

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Re: Iterate DataGrid in Silverlight web application.

Mycroft Holmes21-Jan-11 17:00

Mycroft Holmes

21-Jan-11 17:00

I found an exception to that particular rule. There does not seem to be a reasonable way to bind the SelectedItems of the gridview, I'm iterating them in the code behind and stuffing a list<> in the viewmodel.

Never underestimate the power of human stupidity
RAH

Re: Iterate DataGrid in Silverlight web application.

Pete O'Hanlon22-Jan-11 9:16

22-Jan-11 9:16

You could do it by having an

IsSelected

property and update that if it's selected.

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Forgive your enemies - it messes with their heads

Re: Iterate DataGrid in Silverlight web application.

Mycroft Holmes21-Jan-11 17:01

Mycroft Holmes

21-Jan-11 17:01

Sunil G 3 wrote:
I have googled, but no luck....

Thats b/c is is WRONG, as Pete suggested use the underlying data collection

Never underestimate the power of human stupidity
RAH

Assign a context to a UI Element

Adrian020-Jan-11 21:36

Adrian0

20-Jan-11 21:36

I have several pairs of TextBlock and an Image next to each other. OnMouseLeftButtonDown I want to modify the TextBlock. That is some standard situation, but in this case I don't want to add an EventHandler to each image as there are many of them.

How can I user only one Handler and change the corresponding TextBlock. I've tried to add some DataContext to the image but it did not work out.

Can anyone give me some help?
Thanks!

dasblinkenlight21-Jan-11 3:16

dasblinkenlight

21-Jan-11 3:16

You can use the Tag tag to store additional info with your images, for example:

XML

<Image Tag="textbox1" MouseLeftButtonDown="Image_MouseLeftButtonDown"  />
<Image Tag="textbox2" MouseLeftButtonDown="Image_MouseLeftButtonDown"  />

Now you can access the tag in your event handler, and act based on its value:

private void Image_MouseLeftButtonDown(object sender, MouseButtonEventArgs e) {
    var textboxName = ((Image) sender).Tag;
    // pick a text box based on the tag
}

Adrian021-Jan-11 3:30

Adrian0

21-Jan-11 3:30

Hi dasblinkenlight,

thank you for your reply. This might be a solution. Would be great to access the textbox directly when an event is fired. Otherwise I need to put all textboxes in an array or not?

I thought of something like this below.

<TextBox x:Name="UserNameTB" />
<TextBox x:Name="AddressTB" />
<Image Source="..." MouseLeftButtonDown="editText_MouseLeftButtonDown" Tag="{UserNameTB}"/>
<Image Source="..." MouseLeftButtonDown="editText_MouseLeftButtonDown" Tag="{AddressTB}"/>

Is it possible to access it like this??

TextBox userNameTB = ((sender as Image).Tag) as TextBox);

Tried some combinations but with no luck.

Greets
Adrian

dasblinkenlight21-Jan-11 4:00

dasblinkenlight

21-Jan-11 4:00

Yes, that trick ought to work! I verified that your code works with a slightly modified XAML (I used SilverLight 4):

XML

<Image Source="..." MouseLeftButtonDown="editText_MouseLeftButtonDown" Tag="{Binding ElementName=UserNameTB}"/>
<Image Source="..." MouseLeftButtonDown="editText_MouseLeftButtonDown" Tag="{Binding ElementName=AddressTB}"/>

Pete O'Hanlon21-Jan-11 3:40

21-Jan-11 3:40

If I were doing this, I'd have a collection containing the details of the image, and a text item representing the text you want to display in the TextBlock. Then, I'd bind to this using something like a ListView.

In other words, I'd use MVVM to cope with this. I suggest that you have a look into this, and simplify the problem hugely.

I'm not a stalker, I just know things. Oh by the way, you're out of milk.

Forgive your enemies - it messes with their heads

Embeding a Usercontrol [modified]

Reusable Lookup Control

Ed Hill _5_20-Jan-11 5:14

Ed Hill _5_

20-Jan-11 5:14

I think i may have origionally posted this question in the wrong place, any advice would be appreciated.
.NET Framework\Reusable Lookup Control
sorry for the double post.

Adrian020-Jan-11 2:35

Adrian0

20-Jan-11 2:35

Sounds like a newbie question. But can't help my self for already an hour.

I've Silverlight application with tabs and don't want to put all code in one large file. So I have made single UserControls and now I want to put them into the tab control.

<telerik:RadWindow xmlns:my="clr-namespace:UserEditorApp"  x:Class="UserEditorApp.UserDetailsWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
		xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
        xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk"
        mc:Ignorable="d" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" Height="500" Width="750" Header="User details">
    <Grid>
        <StackPanel Orientation="Vertical">
            <telerik:RadTabControl x:Name="rowDetailsTabControl" ReorderTabRows="False" >
                <!-- User Details tab -->
                <telerik:RadTabItem x:Name="UserDetailsTab" Header="Benutzer Details">
                    <StackPanel>
                        <my:UDW_Details  /> <!-- how can I add the control here? -->
                    </StackPanel>
                    
                </telerik:RadTabItem>
            </telerik:RadTabControl>
        <StackPanel>
    </Grid>
</telerik:RadWindow>

I can't see anything in the designer. Can somebody help me out of this?
Thanks!

modified on Thursday, January 20, 2011 8:43 AM

Re: Embeding a Usercontrol

SledgeHammer0120-Jan-11 6:39

SledgeHammer01

20-Jan-11 6:39

StackPanels size to the size of the content. In your case, the size is 0x0, so you don't see anything.

You need to have your d namespace defined in the my:UDW_Details XAML and then add:

d:DesignWidth="300" d:DesignHeight="300"

to have a design time width and height.

or you can stub in design time data. Either way works.

REMOVE DATA IN ACCORDION AT RUN TIME

jessins18-Jan-11 16:28

jessins

18-Jan-11 16:28

NOW I AM DEVELOPING WPF APPLICATION.THIS APPLICATION I AM USING A ACCORDION CONTROL.IN FIRST TIME I FILL DATA IN IT.AFTER THIS, I WANT FILL NEW DATA TO IT .BUT I CAN"NT FILL TO IT. so please give your subsections
thanks and regards

Re: REMOVE DATA IN ACCORDION AT RUN TIME

Abhinav S18-Jan-11 18:04

Abhinav S

18-Jan-11 18:04

1) Dont shout.
2) You can do this. Loop through the items inside an accordion and then remove items from it (or add new items to it).
Sample here[^].

The funniest thing about this particular signature is that by the time you realise it doesn't say anything it's too late to stop reading it.

My latest tip/trick

Access Parent of Templated TreeViewItem Control ?

AmitDey17-Jan-11 5:56

AmitDey

17-Jan-11 5:56

I have a treeview with a Template

The treeviewitem has an event handler. I want to access the parent treeviewitem from here. How can I achieve this.

End Goal - User can select a node and delete it.
Template

<br />
   <sdk:HierarchicalDataTemplate x:Key="TreeViewMainReadTemplate" ItemsSource="{Binding Children}"><br />
            <TextBlock Text="{Binding Text,Mode=TwoWay}"               <br />
                      MouseLeftButtonDown="TreeViewMain_MouseLeftButtonDown"></TextBlock><br />
        </sdk:HierarchicalDataTemplate><br />

TreeView

<br />
            <sdk:TreeView Name="TreeViewMain"    <br />
                      ItemTemplate="{StaticResource TreeViewMainReadTemplate}"                     <br />
                      Width="400" Height="400"  ><br />
            </sdk:TreeView><br />

Event Handler Where I want to access parent

 <br />
private void TreeViewMain_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)<br />
        {<br />
}<br />

Binding Data Class

<br />
    public class Node<br />
    {<br />
        private String text;<br />
        private ObservableCollection<Node> children;<br />
        public ObservableCollection<Node> Children<br />
        {<br />
            get{ return children;}<br />
            set{ children = value;}<br />
        }<br />
<br />
        public String Text { get { return text; } set { text = value; } }<br />
<br />
        public Node(String text)<br />
        {<br />
            Children = new ObservableCollection<Node>();<br />
            Text = text;<br />
        }<br />
<br />
        public void Add(Node node)<br />
        {<br />
            children.Add(node);            <br />
            NotifyPropertyChanged("Children");<br />
        }<br />
<br />
        public void Delete(Node node)<br />
        {<br />
            children.Remove(node);<br />
            NotifyPropertyChanged("Children");<br />
        }<br />
<br />
        public event PropertyChangedEventHandler PropertyChanged;<br />
<br />
        private void NotifyPropertyChanged(String info)<br />
        {<br />
            if (PropertyChanged != null)<br />
            {<br />
                PropertyChanged(this, new PropertyChangedEventArgs(info));<br />
            }<br />
        }<br />
    }<br />

Re: Access Parent of Templated TreeViewItem Control ?

SledgeHammer0118-Jan-11 7:30

SledgeHammer01

18-Jan-11 7:30

'sender' should be your Node object. You can then do something like:

Node node = sender as Node;

TreeViewItem tvi = ItemContainerGenerator.ContainerFromItem(node) as TreeViewItem;

You need to be careful here though because the WPF treeview is virtualized, so the TreeViewItem objects come and go as you scroll, collapse, etc. Its possible that ItemContainerGenerator.ContainerFromItem(node) will return null.

Re: Access Parent of Templated TreeViewItem Control ?

AmitDey18-Jan-11 7:40

AmitDey

18-Jan-11 7:40

Thanks SledgeHammer01

I was just able to do this using TreeViewExtension part of the silverlight tookit.

TreeViewItem selectedTreeViewItem =
TreeViewExtensions.GetContainerFromItem(TreeViewMain, selectedNode);

if (selectedTreeViewItem != null)
{
TreeViewItem selectedTreeViewItemParent =
TreeViewExtensions.GetParentTreeViewItem(selectedTreeViewItem);

Also thankyou for your suggestions about binding the treeview data. I am doing that, and my life's much easier Smile | :)

sql server express [modified]

arkiboys17-Jan-11 2:30

arkiboys

17-Jan-11 2:30

Apologiese.
Wrong post.

modified on Monday, January 17, 2011 9:24 AM

Re: sql server express

Pete O'Hanlon17-Jan-11 3:12

17-Jan-11 3:12

And what does any of this have to do with Silverlight or WPF?

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Forgive your enemies - it messes with their heads