Questions on UI for WPF Forum

6 answers

321 views

Hello,

Is there a way to detect if a cell is set readonly by the IsReadOnlyBinding property of the parent column?

I need it for two reasons:

1. I want do display text inside _all_ readonly cells in Italics. The preferred way to do this would be some Trigger in the ControlTemplate of the GridViewCell (I have created my own cell template anyway).

2. I have to check it before entering edit mode. I manually set the IsInEditMode property of the cell on MouseUp, not on MouseDown (as default), as MouseDown should only select the cell.

Alex

GridView

answered on 06 Mar 2015

3 answers

90 views

Drop with dragged appointments highlighted

Hi,

I'm using a drag drop behavior and in the DragDropCompleted operation I would like to highlight (select) the appointments that I just dragged, is this possible?

Thank's
Alain

ScheduleView

answered on 06 Mar 2015

4 answers

221 views

RowStyleSelector when using ObservableCollection

Hi,

I am trying to use RowStyleSelector with a RadGridView having an ItemsSource of type ObservableCollection<T>. The RowStyleSelector looks at the value of a property of T to set the background color of the corresponding row.

My problem is that the items may be altered outside of the grid. The new values are immediately picked up by the cells of the grid (because of the ObservableCollection and because T implements INotifyPropertyChanged), but the row style is not updated accordingly. However, if I sort the grid by clicking on one of the columns, the row styles are updated.

How can I ensure that the style is updated as soon as the values of the cells are updated?

In case it matters, this is how the RadGridView is declared (stripped down a bit):

<telerik:RadGridView Name="DocumentGrid" SelectionMode="Extended" ItemsSource="{Binding Path=Documents}" AutoGenerateColumns="False" IsReadOnly="True" RowStyleSelector="{StaticResource DocumentStyleSelector}">

This is the RowStyleSelector (stripped down a bit):

internal class DocumentStyleSelector : StyleSelector

{

public Style DocumentModifiedStyle { get; set; }

public override Style SelectStyle(object item, DependencyObject container)

{

var document = item as Document;

if (document != null && document.EntityState == EntityState.Modified)

{

return DocumentModifiedStyle;

}

return null;

}

And this is the Style (stripped down a b

<layout:DocumentStyleSelector x:Key="DocumentStyleSelector">

<layout:DocumentStyleSelector.DocumentModifiedStyle>

<Style TargetType="telerik:GridViewRow">

<Setter Property="Background" Value="DarkGray" />

</Style>

</layout:DocumentStyleSelector.DocumentModifiedStyle>

</layout:DocumentStyleSelector>

Best regards
Linus

GridView

answered on 06 Mar 2015

3 answers

366 views

Resizing Tile

Hi I see there are 3 sizes for tiles at the moment. Single, Double and quadruple.

I was wondering if there are anymore sizes. I would like a Double and a Quadruple to be Stack ontop of eachother vertically.

TileList

answered on 06 Mar 2015

2 answers

107 views

GridView performance issues when sorted on column with non unique values

Hi Team,

The RadGridView performs very poorly when you sort by a column with non unique values and select many rows. The UI thread gets stuck and it takes a while for it to come back, which causes issues with updates or other user operations following it. Our test was done on 50,000 rows.

To reproduce:
1. Bind RadGridView ItemsSource to a collection with 50,000 items. Set selection mode to Extended. Make one values of one property unique and the other constant.
2. Run the sample and sort by the column with constant value.
3. Select all rows in the grid (CTRL+A)
4. Click on any row on the grid to verify that Dispatcher thread is locked.
Note that if grid is sorted by unique value column same operation is fairly fast.

See below for the sample view, code behind and VM to reproduce this issue.

<Window x:Class="VariousDataSources.MainWindow"

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"

Title="MainWindow" >

<Window.Resources>

</Window.Resources>

<telerik:RadGridView x:Name="RadGridView1" GroupRenderMode="Flat" AutoGenerateColumns="True"

RowIndicatorVisibility="Collapsed" CanUserFreezeColumns="False"

ItemsSource="{Binding DataSource}" SelectionMode="Extended">

</telerik:RadGridView>

</Window>

public partial class MainWindow : Window

{

public MainWindow()

{

InitializeComponent();

DataContext = new MyModel();

}

public class MyRow

{

public int SlowColumn { get; set; }

public int FastColumn { get; set; }

}

public class MyModel : ViewModelBase

{

public MyModel()

{

DataSource = new ObservableCollection<MyRow>();

for (var i = 0; i < 50000; i++)

{

var row = new MyRow();

row.SlowColumn = 1;

row.FastColumn = i;

DataSource.Add(row);

}

public ObservableCollection<MyRow> DataSource { get; set; }

}

GridView

answered on 05 Mar 2015

1 answer

186 views

RadAutoCompleteBox not working after call BeginInsert in Radgridview

Good Morning.

I need to put a RadAutoCompleteBox inside a GridViewDataColumn, I follow this RadAutoCompleteBox inside GridView example.

Works only when I editing an existent column, but I facing problems when I try to Insert a new row or when I Cancel any modifications.

When I need to insert a new record I call the method BeginInsert of GridView.

this.radGridView.BeginInsert();

It add a new empty row at the end, but then the autocomplete doesn't work anymore.

When I want edit an existing row, and suddenly I decide to cancel the edition; I press Esc key and the value of the column doesn't return to his original value.

I Attach an example of the solution, it has a button with click event, and in the event I call BeginInsert method.
I upload it to dropbox.

Many thanks.

GridView

answered on 05 Mar 2015

5 answers

132 views

Accesing column name on which aggregate function was applied

Hi,

I have a custome aggregate function defined as follows. I would like to access the column name on which this particular function is being called from so that the function can act on that particular column. How can that be done? Currently I have hard-coded the column name('Score') which I do not want to do.

class Summation : AggregateFunction<BindableDynamicDictionary, int>

{

public Summation()

{

this.AggregationExpression = items => FindSum(items);

}

private int FindSum(IEnumerable<BindableDynamicDictionary> source)

{

var itemCount = source.Count();

int sum = 0;

if (itemCount >= 1)

{

var values = source.Select(i => i["Score"]);

foreach (int str in values)

{

sum = sum + str;

}

return sum;

}

Thanks

GridView

answered on 05 Mar 2015

6 answers

371 views

Nested Column Groups in RadGridView WPF

Hi,

I was wondering if there was a way to achieve column grouping similar to http://www.telerik.com/help/winforms/gridview-viewdefinitions-column-groups-view.html in WPF?

I have tried adding to the ChildGroups of the column groups but this doesn't seem to work the same way as the example in the above link.

The problem that I am seeing is that for column groups that do not have nested groups there appears to be an extra row added above each of these (to fill the space for those groups that do have children) which doesn't pick up my style and pushes the content of these groups down so not all of it is visible. What I would like to happen is that for the column groups that contain no nested groups is that the content of these cells fills the space without the extra row above it like the "Customer Contact" group in the winforms example in the link.

Thanks,

Steven

GridView

answered on 05 Mar 2015

1 answer

64 views

PanelBar Item Injection Broke

Hi there,

I just performed an upgrade from 2014 Q4 to 2015 Q1 and have run into an unexpected issue. I have been using Panel Bar Item injection via the prism framework to place panel bar items for each of my modules under their respective headers.

In my shell, the regions are laid out as follows:

<telerik:RadPanelBar

DockPanel.Dock="Left"

Width="200"

regions:RegionManager.RegionName="NavPanelRegion"

Background="LightBlue">

<telerik:RadPanelBarItem

regions:RegionManager.RegionName="NavPanelHomeRegion"

Header="Home">

</telerik:RadPanelBarItem>

<telerik:RadPanelBarItem

regions:RegionManager.RegionName="NavPanelToolsRegion"

Header="Tools">

</telerik:RadPanelBarItem>

<telerik:RadPanelBarItem

regions:RegionManager.RegionName="NavPanelMaintenanceRegion"

Header="Maintenance">

</telerik:RadPanelBarItem>

<telerik:RadPanelBarItem

regions:RegionManager.RegionName="NavPanelReportingRegion"

Header="Reporting">

</telerik:RadPanelBarItem>

</telerik:RadPanelBar>

Then each of the modules has one to many panel bar items defined:

<telerik:RadPanelBarItem x:Class="Modules.Dashboard.Views.DashboardPanelItemView"

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:regions="http://www.codeplex.com/CompositeWPF"

xmlns:vm="clr-namespace:Modules.Dashboard.ViewModels"

Header="Homepage">

<telerik:RadPanelBarItem.Resources>

<vm:DashboardCommandViewModel x:Key="DashboardCommandVm" />

</telerik:RadPanelBarItem.Resources>

<telerik:RadPanelBarItem.Command>

<Binding Source="{StaticResource DashboardCommandVm}" Path="Home" />

</telerik:RadPanelBarItem.Command>

</telerik:RadPanelBarItem>

And during module initalization, the following is called:

public void Initialize()

{

Container.RegisterType<Object, Views.DashboardView>("DashboardView");

this._regionViewRegistry.RegisterViewWithRegion(RegionNames.Navigation.HomeNavigationPanelRegion, typeof(Views.DashboardPanelItemView));

this._regionViewRegistry.RegisterViewWithRegion("ContentRegion", typeof(DashboardView));

}

Prior to the update, this worked just fine and the panel bar items were injected under their respective parents. Now, though, post-upgrade, it's no longer functioning.

Any thoughts?

PanelBar

answered on 05 Mar 2015

2 answers

187 views

[Solved] PaneStateChange event on adding new pane

I have a simple pane factory which basically looks like this:

class PaneFactory : DockingPanesFactory

{

protected override void AddPane(RadDocking radDocking, RadPane pane)

{

//Docking is UserControl, which contains RadDocking

var docking = radDocking.ParentOfType<Docking>();

var settings = pane.Tag as PaneSettings;

if (settings.ScreenPosition == ScreenPosition.Left)

{

//LeftPaneGroup is pane group declared in xaml (docked to left side)

docking.LeftPaneGroup.AddItem(pane, DockPosition.Center);

}

else

{

//DocumentPaneGroup is document host declared in xaml

docking.DocumentPaneGroup.AddItem(pane, DockPosition.Center);

}

So there are two options: pane is either initially docked to the left or to the document host. If it is docked to document host - PaneStateChange
event is fired, but if it is docked to the left - there is no event. Is this a bug or an expected behaviour? Looks really inconsistent to me. Is there a way to force PaneStateChange event to always fire, when new pane is added?

Docking

answered on 05 Mar 2015