Questions on UI for WPF Forum

0 answers

132 views

How To: Determine order of columns in grid associated with datatable

Hello,

When a column on the grid is re-ordered there appears to be only the DisplayIndexMap object in the grid to keep track of the new order. This object is protected so I cannot get at it directly. Since I could not figure out how to determine the new order on the grid side I changed the column order of the datatable to match the grid's.

In the ColumnDisplayIndexChanged event of the grid I added this line of code, which takes care of the re-ordering:

<datatable name>.Columns[e.Column.Header.ToString()].SetOrdinal(e.Column.DisplayIndex);

This event will be triggered twice. Once for the column that was moved and again for the column that was shifted over for the moved column.

When I print the contents of the grid I use the datatable as the data source.

GridView

asked on 11 Jan 2010

0 answers

129 views

HowTo: Filtering grid associated with Datatable

Hello,

I finally figured out how to filter a grid associated with a datatable. Instead of filtering the grid, which was a traumatic experience, I filtered the datatable associated with the grid instead. It took less than 7 lines of code and most of those lines of code were for creating the filter expression:

I am collecting a bunch of values in another window so I can filter the varnames column in my grid so:

string filterexpression = "varnames in (" + < bunch of values> + ")"

gridname.ItemsSource = <datatable name>.Select(filterexpression, <supply sort expression>, DataViewRowState.CurrentRows);

GridView

asked on 11 Jan 2010

3 answers

140 views

Getting Dragged RadtreeViewItems in DropQueryEvent

Hello,

I would like to evaluate wether a Drop Operation on a specfic RadtreeViewItem is allowed.
I got a WPF Radtreeview with hierachical Data Binding, Multiselection and Drag&Drop occurs only within the Treeview.
Therefore I added a Event Handler to the DropQuery Event of the RadTreeview.

    
            RadTreeView1.AddHandler(RadDragAndDropManager.DropQueryEvent, new EventHandler&lt;DragDropQueryEventArgs&gt;(RadTreeView_DropQuery), true);

For my Decision it is necessary to know which RadtreeviewItems are dragged. I don´t need the dragged data objects, because my decision is based on parent of each dragged RadtreeviewItem.

    
            private void RadTreeView_DropQuery(object sender, DragDropQueryEventArgs e) 
        
                    { 
        
                        bool dropPossible = checkIfDropPossible(draggedRadTreeViewItems); 
        
                        if (dropPossible) 
        
                        { 
        
                            e.QueryResult = true; 
        
                        } 
        
                        else 
        
                        { 
        
                            e.QueryResult = false; 
        
                        } 
        
            }

Therefore I need a way to get the dragged RadtreeviewItems in the DropQueryEvent. I searched all e.Options members but I get the responding data objects (e.Options.Payload) only.

How can I get corresponding dragged RadTreeViewItems to the DataObjects in the DropQueryEvent? Any help is welcome.

Best Regards
Akiono Wan

DragAndDrop

answered on 11 Jan 2010

4 answers

114 views

[Solved] CheckedItems only return root item

Hi,

I'm using RadTreeView control for WPF Q2 2009, with values

IsOptionElementsEnabled

="True"

ItemsOptionListType="CheckList"

IsTriStateMode="True"

the treeview is collapsed. If i check first root item but not expand the node, CheckedItems only return one item. Otherwise if I expand the node, CheckedItems returns the root item node and subitems.

Is there any option to avoid that?

This is the example:

    
            <telerik:RadTreeView   
        
                        IsLineEnabled="True"   
        
                        IsOptionElementsEnabled="True" 
        
                        ItemsOptionListType="CheckList"    
        
                        IsTriStateMode="True" 
        
                        IsRootLinesEnabled="True"    
        
                        controls:StyleManager.Theme="Vista" 
        
                    > 
        
                        <telerik:RadTreeViewItem Header="Item0">  
        
                            <telerik:RadTreeViewItem Header="Item1.1"/>  
        
                            <telerik:RadTreeViewItem Header="Item1.2"/>  
        
                        </telerik:RadTreeViewItem> 
        
                        <telerik:RadTreeViewItem Header="Item1">  
        
                            <telerik:RadTreeViewItem Header="Item1.1"/>  
        
                            <telerik:RadTreeViewItem Header="Item1.2"/>  
        
                        </telerik:RadTreeViewItem> 
        
                        <telerik:RadTreeViewItem Header="Item2">  
        
                            <telerik:RadTreeViewItem Header="Item1.1"/>  
        
                            <telerik:RadTreeViewItem Header="Item1.2"/>  
        
                        </telerik:RadTreeViewItem> 
        
                    </telerik:RadTreeView>

When I check node Item0 but not expand it, CheckedItems returns Item 0 only (this happens only the first time node is collapsed)
But expanding it, CheckedItems returns Item 0, Item1.1, Item1.2. (if i collapsed the node again, CheckedItems returns Item 0, Item1.1, Item1.2)

Also I set theme to Vista (controls:

StyleManager.Theme="Vista" ) but I get an orange backgound when mouse is over the nodes. Is this ok?

Thanks and best regards,
Alberto

TreeView

answered on 11 Jan 2010

2 answers

177 views

[Solved] Get the RadTreeViewItem being Edited

In the method signature for the event handler for the event 'Edited' there are the following parameters: ( object sender, RadTreeViewItemEditedEventArgs e ).

How can I get the RadTreeViewItem that is being edited? e.OriginalSource returns an 'EditableHeaderedItemsControl' and sender returns the RadTreeView. Is there something I am missing?

Thank you.

EDIT:

OK, I was able to cast e.OriginalSource to RadTreeViewItem. The problem that I am encountering is that I want to delete the node if its header is empty. So inside the Edited event handler I have the following code:

    
            item.ParentItem.Items.Remove(item);

I get the following null exception:

   at Telerik.Windows.Controls.RadTreeViewItem.CommitEdit() in c:\Builds\WPF_Scrum\Navigation_WPF\Sources\Development\Controls\Navigation\TreeView\RadTreeViewItem.cs:line 718
   at Telerik.Windows.Controls.RadTreeView.HandleItemSelectionFromUI(RadTreeViewItem treeViewItemToSelect) in c:\Builds\WPF_Scrum\Navigation_WPF\Sources\Development\Controls\Navigation\TreeView\RadTreeView.cs:line 2196
   at Telerik.Windows.Controls.RadTreeViewItem.OnHeaderMouseLeftButtonDown(Object sender, MouseButtonEventArgs e) in c:\Builds\WPF_Scrum\Navigation_WPF\Sources\Development\Controls\Navigation\TreeView\RadTreeViewItem.Events.cs:line 790
   at System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)
   at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
   at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
   at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   at System.Windows.UIElement.ReRaiseEventAs(DependencyObject sender, RoutedEventArgs args, RoutedEvent newEvent)
   at System.Windows.UIElement.CrackMouseButtonEventAndReRaiseEvent(DependencyObject sender, MouseButtonEventArgs e)
   at System.Windows.UIElement.OnMouseDownThunk(Object sender, MouseButtonEventArgs e)
   at System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)
   at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
   at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
   at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
   at System.Windows.UIElement.RaiseEvent(RoutedEventArgs args, Boolean trusted)
   at System.Windows.Input.InputManager.ProcessStagingArea()
   at System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)
   at System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport)
   at System.Windows.Interop.HwndMouseInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawMouseActions actions, Int32 x, Int32 y, Int32 wheel)
   at System.Windows.Interop.HwndMouseInputProvider.FilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at System.Windows.Interop.HwndSource.InputFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Boolean isSingleParameter)
   at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler)
   at System.Windows.Threading.Dispatcher.WrappedInvoke(Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler)
   at System.Windows.Threading.Dispatcher.InvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Boolean isSingleParameter)
   at System.Windows.Threading.Dispatcher.Invoke(DispatcherPriority priority, Delegate method, Object arg)
   at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
   at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
   at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
   at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)
   at System.Windows.Window.ShowHelper(Object booleanBox)
   at System.Windows.Window.Show()
   at System.Windows.Window.ShowDialog()

TreeView

answered on 11 Jan 2010

7 answers

139 views

project help

I have a project that I'm deving from scratch.

SQL database
wpf and web
stock/inventory - ordering, tracking

anybody interested in helping me out..

General Discussions

answered on 11 Jan 2010

1 answer

108 views

How do I initiate a sort from code?

I want to initiate sort on the grid from code. I am not having success.

This is what I've tried:

gvDocumentListing.Columns[4].SortingState = Telerik.Windows.Controls.SortingState.Descending;

gvDocumentListing.Rebind();

This does not work. I saw in an earlier post that some one called Columns.Reset(). This method appears to have been removed.

GridView

answered on 11 Jan 2010

5 answers

106 views

Scrolling Programatically in Q3

Good morning

I am developing an application WPF touchscreen, I need to have scrolling programatically.
The example 117850_117835 if it works to me, but with Q3 displays error in the following line.

Panel = Me.RadGridView1.ItemsControl.VirtualizingPanel

'temsControl' is not a member of 'Telerik.Windows.Controls.RadGridView'
As it works in the Q3

Thanks

GridView

answered on 11 Jan 2010

6 answers

163 views

Determine row an column of an item

Is there a way to determine the actual position of a RadTileViewItem in a RadTileView? Something like
RadTileView.GetPosition(RadTileViewItem item, out int row, out int column)?

Thanks,
Michael

TileView

answered on 10 Jan 2010

7 answers

191 views

Multiple notifications when item is checked

Hi,

I've created a treeview which has the TriStateMode enabled and defined a callback function when an item were checked/unchecked.

My problem is that I get notified multiple times if a subitem was checked. The first notification is for the top element, and the next notification is for the top level's child element and so on... The last notification is the checked item itself.

Is there a way to determine the item which was checked?

Thanks
Dieter

TreeView

answered on 08 Jan 2010