Questions on UI for WinForms Forum

3 answers

267 views

Hello there,

I have a telerik tree view with tens of thousands of nodes (around 190k). When I load this in most computers, it works ok, sometimes it takes a few seconds to open nodes, but that's acceptable for the number of nodes.

But, in some Windows 10 computers (not all of them), the tree takes more than 20 min to respond, if it ever does. This happens when clicking anywhere in the tree component (expand buttons, nodes, scrollbar...).

One of the computers details where it hangs is:

Windows 10 Enterprise (64 bit). Version 1703.
.NET 4.7.1
Telerik 2018.1.116.40
The laptop has a touch screen

After debugging I found the tree is stuck in GetChild() method (it loops through all the nodes, several times), from RadTreeViewAccessibleObject (attached call stack). This seems to come from windows messages.

Checking in computers where the tree doesn't hang, this call never happens, which makes me think it's a problem with the implementation of windows messages, in some specific version of windows + hardware.

Any ideas on how to fix or bypass this?

Treeview

answered on 07 May 2018

2 answers

117 views

PageView Winforms

Isn't there any way to add an add (+) button to the pageview so that the user can add pages from the pageview itself

please help me with a code and a screenshot.

thanks In advance

General Discussions

answered on 07 May 2018

1 answer

517 views

Treeview binding to model

I have been populating my treeviews programmatically but would like to change to binding.

I read data from db and build a data model. I'd like to bind the data model to my treeview. so that when collections of objects and objects' properties themselves change they should automatically update in the treeview.

Which binding method would be the best way to achieve this? I've attached a simple mockup diagram to show the hierarchical structure. (Node types are abbreviated and I've removed the N level shown in the diagram from the code, as it doesn't really add to my question). The first part shows the model, and below shows some sample data.

I did a quick test like below which works, but doesn't allow for the collection of Table objects in Form (sibling to the Elements collection) to be populated. I hope this makes sense.

// pseudocode

class DataModel { public List<Form> forms; }

class Form { public string Name { get; set;} public List<Element> Elements; public List<Table> Tables; }

class Element { public string Name { get; set;} }

class Column { public string Name { get; set;} }

class Table { public string Name { get; set;} public List<Column> Columns; }

// not showing creation of data model; see diagram for structure

// var DataModel sampleData;

_view.DataSource = new BindingList<Form>(sampleData.forms);

_view.DisplayMember = "Name\\Name";

_view.ChildMember = "Forms\\Elements";

As a side question, I'd like to have the T objects and the F objects (for example) in their own visual 'folder' in the treeview. Can this be still achieved with data binding, or should I stick my manual population method (which has lots of overhead trying to keep data model and tree view in synch with events, etc.).

Treeview

answered on 07 May 2018

2 answers

107 views

CardView How to set up saving of data in the database?

I connected the database to the "CardView".
I made the changes in the "CardView" field.

How can I make changes saved in the database?

General Discussions

answered on 07 May 2018

2 answers

217 views

Scope of setting RadGridLocalizationProvider

What is the scope of setting RadGridLocalizationProvider please?

When setting it, it doesn't seem to be assigned to anything eg a particular window. So I'm a bit confused whether it should be set once on startup or if it should be set per form.

On the surface the function "CurrentProvider" appears to be setting.a static variable somewhere, so does the function add the new instance to a list? or does it override a single instance and need resetting after a child form is disposed?

Sorry if this seems like a dumb question.

public class GeneralRadGridLocalizationProvider : RadGridLocalizationProvider

{

public override string GetLocalizedString(string id)

{

switch (id)

{

case RadGridStringId.ConditionalFormattingPleaseSetValidCellValue: return GuiResources.Please_set_a_valid_cell_value;

//foo bar the remaining ids

case RadGridStringId.ExpressionFormNotButton: return string.Empty; //if empty, default button image is used

}

return string.Empty;

}

}// class

public function FooBar()

{

RadGridLocalizationProvider.CurrentProvider = new GeneralRadGridLocalizationProvider();

}

GridView

answered on 04 May 2018

1 answer

86 views

Coloring Expanded RowHeader

Hi,

is it possible to color only the expanded row header?

See image.

What type has this cell?

GridView

answered on 04 May 2018

1 answer

129 views

Problem with cusotm objects deserialization

Hello,

I have some problems when I try to deserialize custom objects which implements RadDiagramShape.

I have implemented a custom shape :

public class MyShape : ElementShape

{

public override GraphicsPath CreatePath(System.Drawing.Rectangle bounds)

{

GraphicsPath path = new GraphicsPath();

path.AddString("Custom", new System.Drawing.FontFamily("Arial"), 0, bounds.Width, Point.Empty, StringFormat.GenericTypographic);

return path;

}

And a custom diagramShape :

public sealed class MyDiagramShape : RadDiagramShape

{

public MyDiagramShape()

{

ShapeText = "";

ElementShape = new MyShape();

InternalElementColor = System.Drawing.Color.LightBlue;

}

I add this custom shape to my diagram:

MyDiagramShape diagramShape = new MyDiagramShape();

diagramShape.Position = new Telerik.Windows.Diagrams.Core.Point(100, 80);

radDiagram1.AddShape(diagramShape);

This works fine, and when I serialize, I get a XML like this:

<RadDiagram>

<Shapes>

<MyDiagramShape Type="WindowsFormsApplicationCustomShape.MyDiagramShape"

</Shapes>

</RadDiagram>

Problems come when I try to load this XML, object instanciated are typed as RadDiagramShape and not MyDiagramShape.

When I serialize again, the structure of the XML is like this :

<RadDiagram>

<Shapes>

<RadDiagramShape Type="Telerik.WinControls.UI.RadDiagramShape"

</Shapes>

</RadDiagram>

I don't know if it's possible to instanciate objects with their derived type like specified in the XML ?

Thanks in advance

Diagram, DiagramRibbonBar, DiagramToolBox

answered on 04 May 2018

0 answers

69 views

CardView. How to make an HTML format appear in the CardView field?

How to make an HTML format appear in the CardView field?

General Discussions

asked on 03 May 2018

3 answers

1.2K+ views

Scrolling RadTextBox

Hello,

I'll try and explain what I'm after. I have a multiline RadTextBox, (takes about 7 lines of text). I dont want to show scroll bars as I start to type. When the text gets to the 8th line either via enter or wordwrap to make the vertical scroll bar appear.

I can do this with a RichTextbox but need to use a RadTextBox

Is this possible?

I have tried using the .lines property but that doesn't increment when using word wrap.

Any help much appreciated.

Terry

TextBox

answered on 03 May 2018

1 answer

347 views

App icon

I can't see how to set the main icon of the application. i.e. what is seen when the app is minimized to the taskbar and also when installing from clickonce publishing.

Form

answered on 03 May 2018