Questions on UI for WinForms Forum

3 answers

590 views

Exporting current page from viewer as image

Hi,

I've been struggling to work out how to export the current pdf page as shown in the pdfViewer after it has been rotated using controls in the pdfViewerNavigator. I'm trying to save the image in png format but it seems to export the page in the original orientation ignoring the applied rotation.

Also whilst searching the forum for a solution, I came across the code

this.radPdfViewer1.PdfViewerElement.CurrentPage.PageNo

but it appears that PageNo no longer exists in 2020.3.1020.

Currently i'm using

pdfViewer.ExportPage ( 0, _tempImageFileName, 1.0, true, ImageFormat.Png );

which exports the first page as a png, which works, I just need to save the currently selected page that may or may not have been rotated.

Is this possible, if so how ?

PdfViewer and PdfViewerNavigator

updated answer on 28 Mar 2025

1 answer

79 views

Trackbar

Hello,

Is there a way to increase the size of the bar indicated by the arrow?

Best regards :)

TrackBar

answered on 28 Mar 2025

1 answer

95 views

Menu control drop-down menus were not displayed in the correct position for the first time

Dear Sir

When I using the demo winform (version. 2025 Q1), all the menu drop-down menus were not displayed in the correct position for the first time. Include the controls of menus and ribbon bar in hidden mode. Could you please checked the display problem. Is there any solution to prevent the error from showing? Thanks.

Menu

RibbonBar

answered on 27 Mar 2025

1 answer

95 views

Saving and reloading Layout of multi-level hierarchical RadGridView destroys Display

Hi

I have a GridView with a relational hierarchy of two levels connected via two manual relations and two templates.

			gridViewRelation1.ChildColumnNames.Add("AktivitaetVorgang");
			gridViewRelation1.ChildTemplate = this.templateFremdeAktivitaetVorgaenge;
			gridViewRelation1.ParentTemplate = this.radGridPsz.MasterTemplate;
			gridViewRelation1.RelationName = "relationAktivitaetVorgang";

			gridViewRelation2.ChildColumnNames.Add("VorgangHandlungsBedarf");
			gridViewRelation2.ChildTemplate = this.templateFremdeVorgangHandlungsbedarfe;
			gridViewRelation2.ParentTemplate = this.templateFremdeAktivitaetVorgaenge;
			gridViewRelation2.RelationName = "relationVorgangHandlungsbedarfe";

			this.radGridPsz.Relations.AddRange(new Telerik.WinControls.UI.GridViewRelation[] {
				gridViewRelation1,
				gridViewRelation2});

The template of the second level is added to the Maintemplate, the template of the third level is added to the template of the second level.

Everything is working fine at first.

But if I save the layout of the grid and reload it after closing and opening the application again (via radGrid.SaveLayout and radGrid.LoadLayout), there are no rows in the third level, although the datasource is the same, and they were there in the beginning.

The rows of the second level do not have childRows although the templates and relations are still there

GridView

answered on 25 Mar 2025

1 answer

91 views

[Solved] How to add a search box to the radform title bar?

Hi

I am designing a WinForm App using UI for WinForms (ver. 2025 Q1). Is there any solution to add a search box to the radform title bar? It looks like the search box at th top of Microsoft Outlook 365 application.

Form

TitleBar

answered on 25 Mar 2025

1 answer

66 views

Telerik.WinControls.UI.Barcode QR could not read it in IOS smartphones

Hi everyone, i use Telerik.WinControls.UI.Barcode to generate QR and every thing is fine with android reads, but IOS read said No usable data found. Could you help me? This is my code

private void PrintDoc_PrintPage(object sender, PrintPageEventArgs e)
{
printDoc.DefaultPageSettings.PaperSize = new PaperSize("Etiqueta5", 300, 150);
printDoc.DefaultPageSettings.Landscape = true;

float leftMargin = e.MarginBounds.Left;
float topMargin = e.MarginBounds.Top;
float printableWidth = e.MarginBounds.Width;
float printableHeight = e.MarginBounds.Height;

float labelWidth = 300;
float labelHeight = 150;

float qrSize = 150;
float margin = 3;

Font font = new Font("Arial", 9, FontStyle.Bold);
Font smallerFont = new Font("Arial", 8, FontStyle.Bold);
Brush brush = Brushes.Black;

while (_currentRowIndex < dgv_resultado.Rows.Count)
{
DataGridViewRow row = dgv_resultado.Rows[_currentRowIndex];


string idBien = row.Cells["IDBien"].Value?.ToString() ?? "N/A";
string url = "http://www.mypage.com/";
string articulo = row.Cells["Articulo"].Value?.ToString() ?? "N/A";
string serie = row.Cells["NumSerie"].Value?.ToString() ?? "N/A";
string fondos = ObtenerFondos(idBien);
string contraloria = "";
if (bandera == 0)
{
contraloria = row.Cells["NumContraloria"].Value?.ToString() ?? "N/A";
}
else
{
contraloria = row.Cells["NoContraloria"].Value?.ToString() ?? "N/A";
}

string qrData = $"IdBien:{idBien}|Liga:{url}|Artículo:{articulo}|Serie:{serie}|Fondos:{fondos}|Contraloría:{contraloria}";

byte[] utf8Bytes = Encoding.UTF8.GetBytes(qrData);
string qrDataUtf8 = Encoding.UTF8.GetString(utf8Bytes);

rbv_code.Value = qrDataUtf8;

Bitmap qrImage = new Bitmap(rbv_code.Width, rbv_code.Height);
rbv_code.DrawToBitmap(qrImage, new Rectangle(0, 0, qrImage.Width, qrImage.Height));

float xStart = (e.PageBounds.Width - labelWidth) / 2;
float yStart = 0;

float qrXPosition = xStart + (labelWidth - qrSize) / 2;

e.Graphics.DrawImage(qrImage, qrXPosition, yStart + margin, qrSize, qrSize);

float textYPosition = yStart + qrSize + (2 * margin);
string unisonText = "My Page";
SizeF unisonSize = e.Graphics.MeasureString(unisonText, font);
e.Graphics.DrawString(unisonText, font, brush, xStart + (labelWidth - unisonSize.Width) / 2, textYPosition);

textYPosition += 15;

try
{
PostDataToApiNormal(Convert.ToInt32(idBien), Empleado);
}
catch { }


string idBienText = $"ID: {idBien}";
SizeF idBienSize = e.Graphics.MeasureString(idBienText, smallerFont);
e.Graphics.DrawString(idBienText, smallerFont, brush, xStart + (labelWidth - idBienSize.Width) / 2, textYPosition);

if (pb_logo.Image != null)
{
float imageHeight = 35;
float imageWidth = 35;
float imageXPosition = xStart + (labelWidth - imageWidth) / 2;
float imageYPosition = textYPosition + 20;


for (float offset = -0.5f; offset <= 0.5f; offset += 0.5f)
{
e.Graphics.DrawImage(pb_logo.Image, imageXPosition + offset, imageYPosition + offset, imageWidth, imageHeight);
}
}



_currentRowIndex++;
if (_currentRowIndex < dgv_resultado.Rows.Count)
{
e.HasMorePages = true;
return;
}
}

e.HasMorePages = false;
}

Barcode

BarcodeView

answered on 20 Mar 2025

1 answer

80 views

Spreadsheet - Error when opening form

We have a form in our application with just a RadSpreadsheet element that loads a local Excel file.

It works fine on the machine we developed the appplication on. After we installed it on our machine for testing we get the following error when opening the form (full exception in attachments):

"Type 'Telerik.WinControls.UI.RadButtonAccessibleObject' has a ComVisible(false) parent 'System.Windows.Forms.Control+ControlAccessibleObject' in its hierarchy, therefore QueryInterface calls for IDispatch or class interfaces are disallowed."

The spreadsheet is then also crossed out in red.

Is there maybe something we are missing here?

Spreadsheet

answered on 18 Mar 2025

1 answer

78 views

LayoutControl

How can I prevent the controls at the top of the form from spacing out when the form is larger than my design size? I would prefer that the tabbedgroup at the bottom just expand to fill the available space, but I cannot seem to make that work.

LayoutControl

answered on 14 Mar 2025

1 answer

89 views

how to apply different color for theme without adding new resource file

Hello,

is there any alternate available to apply specific theme directly on win form controls other than making a change in stylesheet (to apply different colors and appearance?) basically, for specific theme user wants to apply different color. one option is to create .tsp file and add it to resource. so is there any other way possible where user don't need to create. tsp or any other file and by using direct property he can achieve the same. (controls like date time picker, calendar, tree view, Rad buttons etc.)

Thank you.

Calendar, DateTimePicker, TimePicker and Clock

DateTimePicker

Treeview