Questions on UI for WPF Forum

5 answers

384 views

How to improve the GridView's load times

Hi guys,

I have a user control which contains a RadPanelBar with 5 RadPanelBarItems and within each item is a grid (total 5 grids). The issue I am having is that that the grids take around 3-4 seconds to render. Each grid consists of about 10 rows, 16-17 columns, 1-2 groupings. The RadPanelItems are set to expanded by default. Each grid has a row loaded event handler attached and data is bound in XAML via CollectionViewSource objects. I've checked out the degraded performance section in the help file so I tried setting the Grid's Rows, RadPanelBar, RadPanelBarItems and GridView to fixed sizes. I'm binding to an ObservableCollection of BindingLists so not sure if this affects performance. Not using converters, cell templates or alternate row style.

I've used JetBrains dotTrace performance to determine which functions are taking the longest to load. I've managed to narrow it down to the MeasureOverride function from the GridViewCellsPanel class, specifically it goes down to the GenerateAndMeasureChildrenForRealizedColumns() -> GenerateChildren() functions. My question is that is there anyway I can do to reduce the load times of these grids? This app supercedes our old app which was written in C# WinForms, however loads instantaneously. I've attached a screenshot of my grids setup (the rest of the grids require me to scroll down the view).

Cheers,

Tim.

GridView

answered on 31 Jul 2015

1 answer

242 views

MouseDown event not working for VisualizationLayer DataTemplate

Hi,

Hi i am trying to receive the MouseDown event from the local:Marker which I have created using a user control. The MouseDown event will be used to determine when to drag the marker, log other information as well as performing image change.
I have tested the local:Marker user control without using any telerik codes purely to find out if the MouseDown event works and the result was fine, the user control is able to bubble up the event.

However when i integrate the user control into the DataTemplate, I was not able to receive any form of MouseDown event. Any explaination or ways to over come this?

<telerik:RadMap x:Name="OsmMap"

Center="30.335,143.183"

GeoBoundsNW="85,-180"

GeoBoundsSE="-85,180"

ZoomLevel="10"

TouchDown="OnMap_TouchDown"

MouseDown="OnMap_OnMouseDown"

ZoomingFinished="OnMap_ZoomingFinished"

PanningFinished="OnMap_PanningFinished"

ZoomChanging="OnMap_ZoomChanging"

CenterChanging="OnMap_CenterChanging"

NavigationVisibility="Hidden"

CommandBarVisibility="Hidden"

ZoomBarPresetsVisibility="Hidden"

ZoomBarVisibility="Hidden"

MiniMapExpanderVisibility="Hidden"

MouseLocationIndicatorVisibility="Hidden" IsTextSearchCaseSensitive="True">

<telerik:VisualizationLayer x:Name="MarkerLoaded">

<telerik:VisualizationLayer.ItemTemplate>

<DataTemplate>

<local:Marker telerik:MapLayer.Location="{Binding Location}"

Latitude="{Binding Latitude, Mode=OneWay}"

Longitude="{Binding Longitude, Mode=OneWay}"

CurrentState = "{Binding State, Mode=OneWay}"

MouseLeftButtonDown="MapWp_MouseDown"

MouseDown="MapWp_MouseDown"

PreviewMouseDown="MapWp_MouseDown"

TouchDown="MapWp_TouchDown">

<local:Marker/>

</DataTemplate>

</telerik:VisualizationLayer.ItemTemplate>

</telerik:VisualizationLayer>

</telerik:RadMap>

Map

answered on 31 Jul 2015

1 answer

108 views

Generate Slots on Drag initialize

Is there the capability to generate and display slots when an appointment is started to be dragged?

I.e. I have an appointment and I want to restrict that it can only be moved within a 2 day window either direction. I can do the CanDrop/Drop in a CustomDragDropBehavior to do the actual restriction, however I'd like to visually show the user that they cannot move it 3 days.

ScheduleView

answered on 31 Jul 2015

4 answers

521 views

Handler type not valid error with GridViewRow Selected event

I'm getting "Handler type not valid" when I set the Selected event in the RowStyle.
My XAML is:

<telerik:RadGridView.RowStyle>

<Style TargetType="telerik:GridViewRow" >

<EventSetter Event="Selected" Handler="pHandleItemSelected" />

</Style>

</telerik:RadGridView.RowStyle>

And my event handler is:

Private Sub pHandleItemSelected(sender As System.Object, e As RoutedEventArgs)

End

The documentation says that this is the type of handler. So what is the problem?

GridView

answered on 31 Jul 2015

4 answers

266 views

How to know ActualHeight from shape?

Hello,

I want to align some custom shapes vertically from my diagram. I make a method called AlignShapes inside a class inheried from SerializableGraphSourceBase<Shape_VM, Link_VM>, and this method is invoked always when InternalItems Changed.

I have create my custom shape class, inherited from NodeViewModelBase and I give it 2 properties, Height and Width (double), that I binded these properties in XAML. Depend of the custom shape, height value is NaN for auto-size, then, when I get the value from custom shape, it return NaN, but the shape in the diagram has a specific height value that I do not know to get.

How can I get Shape ActualHeight?

Thank you!

Diagram

answered on 31 Jul 2015

1 answer

270 views

Offline CHM documentation

Hello,

in the download page, the offline CHM documentation is marked as Telerik_UI_for_WPF_ApiReference_2015_2_728.chm.

When the file is downloaded and opened, it says that the documentation is for the previous version: Assembly: Telerik.Windows.Controls.Input (in Telerik.Windows.Controls.Input.dll) Version: 2015.2.623.40 (2015.2.623.40)

Naturally, the new members are missing from the documentation...

General Discussions

answered on 30 Jul 2015

2 answers

89 views

Prevent selected item on child nodes

Hi,

How can I prevent selected items on treelistview child nodes?

Thank you

TreeListView

answered on 30 Jul 2015

1 answer

86 views

Get RowDetails elements

I'm using a GridView wich RowDetailsTemplate is another GridView, i need to iterate inner GridView rows... i'm iterating parent GridView rows this way

IList<GridViewRow> rows = radGridView.ChildrenOfType<GridViewRow>();

but how can i get the GridView inside the row details template

GridView

answered on 30 Jul 2015

1 answer

507 views

Getting the number of pages

Hi,

How to get the number of pages of the PdfViewer document?
I am pasting (in case) a part of the code where I am importing the pdf document.

public void ShowPdfFile(RadPdfViewer rad, string documentPath)

{

_radPdfViewer = rad;

_documentPath = documentPath;

try

{

var readAllBytes = File.ReadAllBytes(documentPath);

var memoryStream = new MemoryStream(readAllBytes);

rad.DocumentSource = new PdfDocumentSource(memoryStream);

}

catch (Exception e)

{

}

Is it possible to get also the number of pages of the RadRichTextBox document?

BR,

Marta

PDFViewer

answered on 30 Jul 2015

13 answers

1.1K+ views

How to filter TreeView

Do you guys have a sample solution that does the filter on the Tree Generically. I have searched and all the examples are hard coded to filter couple of levels but they don't work if the tree has multiple levels.

Could you please help me with a solution for this? I have tried using CollectionViewSource, but not able to filter below the Root level I am able to filter only at the top level.

Lets for example I have this Tree - got this from one of your examples.

Animal
Dog
Cat
Fish
Fresh Water
Roach
Bream
Salt Water
Skate
SkateChild
Soul

In this example, If I type "d" , I should get the following result.
Animal
Dog
Fish
Salt Water
Skate
SkateChild

Please let me know if you can help me with a solution that would work for n level of nodes.

This is highly critical for us and any help on this is really appreciated.

TreeView

answered on 30 Jul 2015