or
2 answers
158 views
Hi, so I'm wondering how I can check for that and disable the drop under some circumstances. I've already tried all the drag and drop events that make sense to me in the TreeView (DragEnter, DragStarted DragOver, PreviewDragEnter, PreviewDragStarted, PreviewDragOver), so when I start dragging and I move the dragged object around, none of this events get fired. I also tried an approach with the RadDragAndDropManager here:
But to my surprise, the OnDropInsideTreeViewDropQuery event never got fired. Am I missing something here?
What I want to do is pretty simple. I have several types of objects in my treeview, say:
Junkyards
Junkyard 1
Cars
Toyota Corola
Nissan Sentra
Furniture
Stove
Desk
Computers
Dell Inspiron
HP a2921
Junkyard 2
Cars
Toyota Corola
Nissan Sentra
Furniture
Stove
Desk
Computers
Dell Inspiron
HP a2921
So if the user drags a car from Junkyard1 to Junkyard2 and hovers it over Computers, basically I wan't to show a NO cursor, but if he does drag it over the Cars node, then it should allow him to drop there. The Junkyards cannot be dragged, so I need to check if the user is trying to drag a Junkyard and not allow him to.
Please keep in mind that I'm not doing the TreeView filling in code or XAML, the data is coming from an XML document, so I can't just go to each RadTreeViewItem and set the IsDropAllowedProperty to false, it has to be done programmatically through the events.
Thanks!
Lauren Nickerson
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answered
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16 Dec 2009
3 answers
279 views
when i set the tabitem foreground to black and i click on an other tab it's foreground becomes white,
how can i stop this behavior?
how can i stop this behavior?
Dimitrina
Telerik team
answered
on
16 Dec 2009
3 answers
170 views
Hello,
I have a treeview control and want to check the nodes from code dynamically according to the values coming from the database. Below is my xaml
I try your solution at this page
http://www.telerik.com/community/forums/wpf/treeview/how-to-check-uncheck-items-from-code-behind.aspx
But could not resolve it. When i try the method mentioned at the solution it gives an error. The error comes from the if statement
"Object reference not set to an instance of an object". Below is the code.
Can you suggest a solution please.
Regards.
I have a treeview control and want to check the nodes from code dynamically according to the values coming from the database. Below is my xaml
| <telerik:RadTabItem.Content> |
| <telerik:RadTreeView Name="TreeViewCategories" SelectionMode="Extended" |
| IsLineEnabled="True" ItemsOptionListType="CheckList" IsOptionElementsEnabled="True" |
| IsRootLinesEnabled="True" IsTriStateMode="True" > |
| <telerik:RadTreeView.ItemTemplate> |
| <HierarchicalDataTemplate ItemsSource="{Binding Path=ChildCategories, Mode=TwoWay}"> |
| <StackPanel> |
| <TextBlock Text="{Binding Name}" Name="textblockName"></TextBlock> |
| </StackPanel> |
| </HierarchicalDataTemplate> |
| </telerik:RadTreeView.ItemTemplate> |
| </telerik:RadTreeView> |
| </telerik:RadTabItem.Content> |
I try your solution at this page
http://www.telerik.com/community/forums/wpf/treeview/how-to-check-uncheck-items-from-code-behind.aspx
But could not resolve it. When i try the method mentioned at the solution it gives an error. The error comes from the if statement
"Object reference not set to an instance of an object". Below is the code.
| void ItemContainerGenerator_StatusChanged(object sender, EventArgs e) |
| { |
| if ((sender as RadTreeView).ItemContainerGenerator.Status == System.Windows.Controls.Primitives.GeneratorStatus.ContainersGenerated) |
| { |
| foreach (RadTreeViewItem item in TreeViewCategories.Items) |
| { |
| item.CheckState = System.Windows.Automation.ToggleState.On; |
| } |
| } |
| } |
Can you suggest a solution please.
Regards.
Bobi
Telerik team
answered
on
16 Dec 2009
2 answers
82 views
Hello,
I'd like to know if there exists a way, to show each of related tables while grouping in separate tab of RadTabControl.
I mean that I would like to do the same as in the WPF DataGridView Demo. If you have the Demo , just run it (DataGrid), and you will see that each related table is in TabControl.
Thank you
Wael
I'd like to know if there exists a way, to show each of related tables while grouping in separate tab of RadTabControl.
I mean that I would like to do the same as in the WPF DataGridView Demo. If you have the Demo , just run it (DataGrid), and you will see that each related table is in TabControl.
Thank you
Wael
Wael Slaman
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answered
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16 Dec 2009
2 answers
251 views
Hello everybody.
I have a RadGridView whith three column teo of whic are displayed and edited using cell templates with a radComboBox and a TextBox
The following is the XAML code
<telerik:RadGridView x:Name="radGridDiscounts" HorizontalAlignment="Left" Height="150" Width ="500" AutoGenerateColumns="False" ShowGroupPanel="False" MultipleSelect="False" ColumnsWidthMode="Fill" ItemsSource="">
<telerik:RadGridView.Columns>
<telerik:GridViewDataColumn Header="Descrizione" HeaderTextAlignment="Center" Width="200"
DataMemberBinding="{Binding Description}" IsReadOnly="True" IsFilterable="False" />
<telerik:GridViewDataColumn Header="Tipologia sconto" HeaderTextAlignment="Center" Width="120" IsFilterable="False">
<telerik:GridViewColumn.CellTemplate>
<DataTemplate>
<telerik:RadComboBox x:Name="radComboOperations"
SelectionChanged="radComboOperations_SelectionChanged Loaded="radComboOperations_Loaded"
DisplayMemberPath="Description" SelectedValuePath="Id"/>
</DataTemplate>
</telerik:GridViewColumn.CellTemplate>
</telerik:GridViewDataColumn>
<telerik:GridViewDataColumn Header="Valore" HeaderTextAlignment="Center" Width="75" IsFilterable="False" IsSortable="False"
<telerik:GridViewColumn.CellTemplate>
<DataTemplate>
<TextBox x:Name="textBoxValue" TextChanged="textBoxValue_TextChanged" Loaded="textBoxValue_Loaded"/>
</DataTemplate>
</telerik:GridViewColumn.CellTemplate>
</telerik:GridViewDataColumn>
</telerik:RadGridView.Columns>
</telerik:RadGridView>
So for every record displayed in the radGridView, "radComboOperations" is a radcombobox displayed in one cell template and "textBoxValue" is a textBox of the other cell template.
During the "_Loaded" operations of both controls I initialize properly the values must be displayed.
And there is no problem at all until now.
What do I have to do is to change Text or IsEnabled properties of "textBoxValue" of the corresponding Item ot the radGirdView, when a radComboOperations_SelectionChanged event of "radComboOperations" is raised.
The following is my function for the event
private void radComboOperations_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
RadComboBox comboBox = (RadComboBox)sender;
if (comboBox!=null)
{
MyDTO dto = (MyDTO)comboBox.DataContext;
MyOperation Operation = (MyOperation)comboBox.SelectedItem;
if (Operation.Id == Guid.Empty)
{
//need help here where
//I have to disable the textBoxValue of the corresponding item of the radGridView
//where and how can I find the textBoxValue text box of the cell template??
}
}
}
I will thank a lot everyone may help me!!
Bye everybody
Nick
4 answers
405 views
All,
I am using WPF GridView and want to attach a ContextMenu with the GridView. What I want is that when user right-clicks any row a ContextMenu appears with various options like Edit, Delete etc.
I have added a ContextMenu to the RadGridView.ContextMenu however when I right-click on the row is de-selected and the menu appears.
I want to row to be selected and in the code want to get hold of the object bound to the that row.
I would really appreciate for any help.
Regards,
Tahir
I am using WPF GridView and want to attach a ContextMenu with the GridView. What I want is that when user right-clicks any row a ContextMenu appears with various options like Edit, Delete etc.
I have added a ContextMenu to the RadGridView.ContextMenu however when I right-click on the row is de-selected and the menu appears.
I want to row to be selected and in the code want to get hold of the object bound to the that row.
I would really appreciate for any help.
Regards,
Tahir
Vlad
Telerik team
answered
on
16 Dec 2009
1 answer
173 views
Hello,
I need to duplicate the selected row on the grid 1-N times. The duplicates will appear below the selected row. The grid is bound to a datatable in a dataset. The only way I've figured to do this is:
for (int i = 0; i <number of duplicates>; i++)
{
Datarow dr = datatablename.NewRow();
dr.ItemArray = datatablename.Rows[<position of row in grid to duplicate>].ItemArray;
datatablename.Rows.InsertAt(dr, <position of row in grid to duplicate> + 1);
dr = null;
}
Is this the correct way to duplicate rows?
Thanks
Vlad
Telerik team
answered
on
16 Dec 2009
1 answer
115 views
I'm having trouble with the RadNumericUpDown control. I was able to boil it down to the following.
1. Create a Windows Application project
2. Place a Element Host in the default form (Form1)
3. Create a WPF UserControl.
4. Place a RadNumericUpDown control in a UserControl:
5. Place that UserControl in the Element Host
6. Run the program.
7. Attempt to click the up or down button in the RadNumericUpDown control.
8. Watch NullReferenceException occur.
This works fine when run in a native WPF app, but fails when hosted in Winforms.
I've tried this with 2009Q2 and 2009Q3 builds.
I'm currently on the trial for RadControls, and this is pretty much preventing me from completing my evaluation and ultimately purchasing the product.
1. Create a Windows Application project
2. Place a Element Host in the default form (Form1)
3. Create a WPF UserControl.
4. Place a RadNumericUpDown control in a UserControl:
| <UserControl x:Class="UserControl1" |
| xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" |
| xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation" |
| xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" |
| Height="300" Width="300"> |
| <Grid> |
| <Grid.RowDefinitions> |
| <RowDefinition Height="Auto"/> |
| </Grid.RowDefinitions> |
| <telerik:RadNumericUpDown Maximum="100" Minimum="0" IsInteger="True"/> |
| </Grid> |
| </UserControl> |
5. Place that UserControl in the Element Host
6. Run the program.
7. Attempt to click the up or down button in the RadNumericUpDown control.
8. Watch NullReferenceException occur.
This works fine when run in a native WPF app, but fails when hosted in Winforms.
I've tried this with 2009Q2 and 2009Q3 builds.
I'm currently on the trial for RadControls, and this is pretty much preventing me from completing my evaluation and ultimately purchasing the product.
Boyan
Telerik team
answered
on
15 Dec 2009
1 answer
197 views
Hello,
is there a "today" Button in the DTPicker, which selects the current date?
Best regards,
Markus
is there a "today" Button in the DTPicker, which selects the current date?
Best regards,
Markus
Konstantina
Telerik team
answered
on
15 Dec 2009
3 answers
328 views
Hi,
I wanted to know if it is possible to display edit controls only when the mouse is over the row.
I mean by that that if there is a combobox in a cell, the combobox is not visible as long as i am not overing the mouse on a row. Instead of the combobox, we should see the text only. This allow to have a clean datagrid not clustered with tons of controls and, be able to edit easily with the mouse.
Thank you!
I wanted to know if it is possible to display edit controls only when the mouse is over the row.
I mean by that that if there is a combobox in a cell, the combobox is not visible as long as i am not overing the mouse on a row. Instead of the combobox, we should see the text only. This allow to have a clean datagrid not clustered with tons of controls and, be able to edit easily with the mouse.
Thank you!
Tsvyatko
Telerik team
answered
on
15 Dec 2009
