Questions on UI for WPF Forum

5 answers

105 views

Gridview freezes when deleting several records

I am using a GridView to display real-time data (syslog messages) and it works fine as long as I keep adding records. However when I try to remove old records, the GridView just freezes (stops responding). Is there a special way to delete records? Right now I have bounds the ItemsSource to an ObservableCollection and when the number of records in it reaches 10,000 I want to delete the first 100 records (i.e index 0 through 99). GridView seems to have no problem dealing with the 10,000 records but as soon as I delete even one record, it stops responding. I have already tried my own variation of your AddRangeObservableCollection (modified it to stop CollectionChanged notification, delete 100 records and then re-start the CollectioChanged notifications) but the GridView still stops responding after deletion. Please help.

-Ambar

GridView

answered on 30 Nov 2010

9 answers

190 views

TileViewItem Maximized

Hello, A couple questions

IF a user clicks on a tile to maximize it. Would it be possible to call a event before to maximized.

The code would be something like:

private Tile_Click()
If Tile(1) is Clicked
{
messagebox.show
If ok
{
then Tile(1) is Maximized
else
messagebox cancel
message "you don't want to max this tile
}

I know the code not even close
But and snippet would be great

Thoughts>?

Rick

TileView

answered on 29 Nov 2010

6 answers

130 views

RadDateTimePicker sets time portion when bound to nullable DateTime even when InputMode="DatePicker"

The control is bound to a DateTime? and I've specified InputMode="DatePicker" and still it puts the current time into the date selected from the calendar. How can I get just the date portion only?

DateTimePicker

answered on 29 Nov 2010

2 answers

74 views

Customize the splitter Size

Hello,
I am working on a multi-touch project in WPF . and I am trying ti use a telrik splitter.
Every things works when we are using mouse ,but it's difficult to catch the splitter using the fingers.
That's why I am looking to change the size of the splitter to be cached by fingers.
Thanks for help

Docking

answered on 29 Nov 2010

1 answer

37 views

Changing the GridViewTogglecolumnheader' s (+) image into customized image

telerik grid view has a property called gridviewtogglecolumheader.......I want to change the "+" image used for toggling the columns in gridview into a user defined image . Can any one help me out in solving this problem ? Me and Gopal are trying this problem since one month.

GridView

answered on 29 Nov 2010

9 answers

523 views

Can we use radWindow as mainwindow

Can we use RadWindow as main window for the application.

Window

answered on 29 Nov 2010

1 answer

242 views

RadTreeView Checked Event

Hi,

I am using the rad tree view without data binding, and am hooking into the checked changed event of the tree to alter my object model with the new selection in the background code. The checked changed event fires for every sub-node of a node in the tree to update its status, is there an event that fires after all of the checked events have completed on the tree?

Thanks for any help in advance.

TreeView

answered on 29 Nov 2010

2 answers

123 views

GridView Hierarchy Data Grid

<telerik:RadGridView x:Name="RadGridView1" ItemsSource="{Binding}" Grid.Row="1" GroupPanelForeground="Red" >

<telerik:RadGridView.ChildTableDefinitions>

<telerik:GridViewTableDefinition>

<telerik:GridViewTableDefinition.Relation>

<telerik:PropertyRelation ParentPropertyName="Students"/>

</telerik:GridViewTableDefinition.Relation>

</telerik:GridViewTableDefinition>

</telerik:RadGridView.ChildTableDefinitions>

</telerik:RadGridView>

In my Linq to SQL Class I have Students Table and Subjects.

Students field has Student ID, StudentFN, StudentLN while Subjects has SubjectID, Subject, Professor, StudentID.

I have associated the two student id.

My .xaml.cs is

public partial class MainWindow : Window

{

ObservableCollection<MyObject> _MyObject = new ObservableCollection<MyObject>();

DataContextDataContext context1 = new DataContextDataContext();

public MainWindow()

{

InitializeComponent();

DataContext = new ObservableCollection<MyObject>();

RadGridView1.Filtered+=new EventHandler<GridViewFilteredEventArgs>(RadGridView1_Filtered);

foreach (var p in context1.Students)

{

_MyObject.Add(new MyObject { ID = p.StudentID, Name = p.StudentFN });

}

void RadGridView1_Filtered(object sender, GridViewFilteredEventArgs e)

{

RadGridView1.ItemsSource = _MyObject;

}

private void Button_Click(object sender, RoutedEventArgs e)

{

}

public class MyObject

{

public int ID { get; set; }

public string Name { get; set; }

}

I tried running the gridview but it doesn't show the level 2 data grid for the each record nor the column headers of the subject table.

GridView

answered on 29 Nov 2010

1 answer

102 views

RadRichTextBox

Hi,
The RadRichTextBox is not supported in WPF. Isn't it? Will it be done?
Thanks a lot.

General Discussions

answered on 29 Nov 2010

6 answers

228 views

Adding paste special support

Hi.

I have an application with a listview. Each listview item is templated showing additional information . Basically each listview items contains one image and several values like timestamps, string, ints.

The listview can be filtered using radDataFilter, and I want to be able to select an item in the listview, copy the item (I use my own clipboard format), go into the filter and then paste one of the copied values from my custom formattet content in the clipboard. I want to prompt the user with a dialog to choose with exact information to actually paste from the clipboard. And the content of clipboard should remain after the radDataFilter pasing.

My first approch to this has been to do it like this (simplified code):

private void filter_EditorCreated(object sender, Telerik.Windows.Controls.Data.DataFilter.EditorCreatedEventArgs e)

{

DataObject.AddPastingHandler(e.Editor, new DataObjectPastingEventHandler(CheckPasteFormat));

}

public void CheckPasteFormat(object sender, DataObjectPastingEventArgs e)

{

PasteWindow win = new PasteWindow();

win.ShowDialog(); // Modal dialog

string result = win.Value.ToString();

DataObject d = new DataObject();

d.SetData(DataFormats.Text, result);

e.DataObject = d;

}

The problem with this solution is that showing a new window or as test just call MessageBox.Show gives an error:

Cannot perform this operation while dispatcher processing is suspended.

I have found a solution to this using Dispather.BeginInvoke but this has another problem with the folowing part updating the DataObject due to it is asynchroniously. There might be solutions to this also, but it gives me a feeling of a lot of hacks to make it work

So my next approach (and maybee more correct solution) would be to define a new "Paste special" command/functionality to handle my special pasting inside editor. Actually kind of the same way as Word, Excell etc does it, Im not very familiar with commands and stuff like that. Can you tell me if it is possible to add/append a "paste special" command with keyboard shortcut to the radDataFilter editors. It should also be available using the right-click menu in the radDataFilter editors.

Hopefully the "Speciel paste" will support undo etc, and clipboard content should not be changed using the "Speciel paste".

Hopefully you will be able to help me with this one.

DataFilter

answered on 29 Nov 2010