How to Prevent the Print Progress Dialog Appearing When Performing a Print Preview

How can I prevent the Print Progress dialog appearing when performing a print preview

I hate to answer my own question, but the solution was staring me in the face.

As I've already coded the ability to print a delivery note, my next step was to provide an on screen copy (i.e. no intention of printing a hard copy). The print preview dialog seemed like an easy way out.

In the end, I just created a custom form and painted directly on to it with no print preview control in sight.

Unfortunately, I got too focused on trying to get the print preview dialogue to behave as I wanted, rather than looking at the bigger problem.

PrinterToPrint without showing the print job Progress dialog

Update:

UIPrinterPickerController comes from UIKit and as such there is no way to push the "printing" process to the background and off the main UI thread.

In the current UIPrintInteractionController.PrintToPrinter implementation (currently up to iOS 10.3 B4) there is no exposed way to disable the print progress (Connecting, Preparing, etc...) alart/dialog (w/ Cancel button) or to modify its appearance.

This interface is high level wrapper using AirPrint and thus Internet Print Protocol (IPP) at a lower level to preform the actual printing, job queue monitoring on the printer, etc... IPP is not currently exposed as a publicly available framework within iOS...

Programs that allow background printing are not using UIPrintInteractionController to do the printing. Most do use UIPrinterPickerController to obtain a UIPrinter selection from the user, but then use the UIPrinter.Url.AbsoluteUrl to "talk" directly to the printer via HTTP/HTTPS Post/Get. Depending upon the printers used, TCP-based sockets are also an option vs. IPP and even USB/serial for direct connected printers.

Re: https://en.wikipedia.org/wiki/Internet_Printing_Protocol

Original:

Pick a Printer:

if (allowUserToSelectDifferentPrinter || printerUrl == null)
{
    UIPrinter uiPrinter = printerUrl != null ? null as UIPrinter : UIPrinter.FromUrl(new NSUrl(printerUrl));
    var uiPrinterPickerController = UIPrinterPickerController.FromPrinter(uiPrinter);
    uiPrinterPickerController.Present(true, (printerPickerController, userDidSelect, error) =>
    {
        if (userDidSelect)
        {
            uiPrinter = uiPrinterPickerController?.SelectedPrinter;
            printerUrl = uiPrinter.Url.AbsoluteUrl.ToString();
            Console.WriteLine($"Save this UIPrinter's Url string for later use: {printerUrl}");
        }
    });
}

Print using UIPrintInteractionController with an existing UIPrinter:

if (printerUrl != null)
{
    // re-create a UIPrinter from a saved NSUrl string
    var uiPrinter = UIPrinter.FromUrl(new NSUrl(printerUrl));
    var printer = UIPrintInteractionController.SharedPrintController;
    printer.ShowsPageRange = false;
    printer.ShowsNumberOfCopies = false;
    printer.ShowsPaperSelectionForLoadedPapers = false;
    var printInfo = UIPrintInfo.PrintInfo;

    printInfo.OutputType = UIPrintInfoOutputType.General;
    printInfo.JobName = "StackOverflow Print Job";
    var textFormatter = new UISimpleTextPrintFormatter("StackOverflow Rocks")
    {
        StartPage = 0,
        ContentInsets = new UIEdgeInsets(72, 72, 72, 72),
        MaximumContentWidth = 6 * 72,
    };
    printer.Delegate = new PrintInteractionControllerDelegate();
    printer.PrintFormatter = textFormatter;
    printer.PrintToPrinter(uiPrinter, (printInteractionController, completed, error) =>
    {
        if ((completed && error != null))
        {
            Console.WriteLine($"Print Error: {error.Code}:{error.Description}");
            PresentViewController(
                UIAlertController.Create("Print Error", "Code: {error.Code} Description: {error.Description}", UIAlertControllerStyle.ActionSheet),
                true, () => { });
        }
        printInfo?.Dispose();
        uiPrinter?.Dispose();

        uiPrinter.
    });
}
else
{
    Console.WriteLine("User has not selected a printer...printing disabled");
}

ProgressBar disappears when displaying print preview

It not a real solution to this problem but I fount a workaround. Instead of using ProgressBarRenderer, I draw the rectangles.

The OnPaint method is now :

protected override void OnPaint(PaintEventArgs e)
{
    Rectangle rect = ClientRectangle;

    using (SolidBrush brush = new SolidBrush(BackColor))
        e.Graphics.FillRectangle(brush, rect);
    e.Graphics.DrawRectangle(Pens.Black, rect.X, rect.Y, rect.Width - 2, rect.Height - 2);
    rect.Inflate(-3, -3);

    if (Value > 0)
    {
        Rectangle clip = new Rectangle(rect.X, rect.Y, (int)Math.Round(((float)Value / Maximum) * rect.Width), rect.Height);
        using (SolidBrush brush = new SolidBrush(ForeColor))
            e.Graphics.FillRectangle(brush, clip);
    }

    using (Font f = new Font(sgvDesigner.FontFamily, 12))
    {
        String text = getDisplayText();
        SizeF len = e.Graphics.MeasureString(text, f);
        Point location = new Point(Convert.ToInt32((Width / 2) - len.Width / 2), Convert.ToInt32((Height / 2) - len.Height / 2));
        e.Graphics.DrawString(text, f, TextColor, location);
    }

    return;
}

The progressBar looks like this :

How do I remove the time from printpreview dialog?

Albo,

I think it might be useful to set a breakpoint at

 '//draw the cell text
 g.DrawString(PrintGrid.Cell(i, j).CText, PrintGrid.Cell(i, j).Font, New SolidBrush(PrintGrid.ForeColor), New RectangleF(CurrentX - PrintGrid.Cell(i, j).Width, CurrentY, PrintGrid.Cell(i, j).Width, PrintGrid.Cell(i, j).Height), sf)

To see exactly what's going on. Without running such a breakpoint, and from this resource here, my first guess might be something like this:

If j = PrintGrid.Columns - 1 Then
    Dim pattern As String = "MM-dd-yy"
    If DateTime.TryParseExact(PrintGrid.Cell(i, j).CText, pattern, Nothing, DateTimeStyles.None, PrintGrid.Cell(i, j).CText) Then
    g.DrawString(PrintGrid.Cell(i, j).CText, PrintGrid.Cell(i, j).Font, New SolidBrush(PrintGrid.ForeColor), New RectangleF(CurrentX - PrintGrid.Cell(i, j).Width, CurrentY, PrintGrid.Cell(i, j).Width, PrintGrid.Cell(i, j).Height), sf)
Else
     g.DrawString(PrintGrid.Cell(i, j).CText, PrintGrid.Cell(i, j).Font, New SolidBrush(PrintGrid.ForeColor), New RectangleF(CurrentX - PrintGrid.Cell(i, j).Width, CurrentY, PrintGrid.Cell(i, j).Width, PrintGrid.Cell(i, j).Height), sf)
End If

This attempts to parse the text of the column (in your case, the PrintGrid.Columns - 1th cell) as a date, if it succeeds, then it puts the newly formatted text back into the column before it sends it to the print sub. I highly doubt this code would work as-is, but with some debugging and application of correct string to datetime formatting...I think this is the right direction.

Flutter: Progress dialog is not hiding

Try with :

onTap: () async {
    pr.show();

    print('clicked custom category');
    print(categorylist[index].catName);
    print(categorylist[index].catId);

    setState(() {
      catId = categorylist[index].catId;
      myinitlist.clear();
      myinitlist = List.from(productList);

       Future.delayed(Duration(seconds: 3)).then((value) {
         pr.hide().whenComplete(() {
          print(pr.isShowing());
        });
       });
    });
 },

or :

onTap: () async {
    pr.show();

    print('clicked custom category');
    print(categorylist[index].catName);
    print(categorylist[index].catId);

   Future.delayed(Duration(seconds: 3)).then((value) {
    setState(() {
      catId = categorylist[index].catId;
      myinitlist.clear();
      myinitlist = List.from(productList);


         pr.hide().whenComplete(() {
          print(pr.isShowing());
        });
       });
    });
 },

Print Preview Control used in a custom Print Preview Dialog

I'm a bit puzzled by this line:

  m_printPreviewControl = new PrintPreviewControl();

You don't seem to attach or position this control.

If you placed it with the Designer, this line should be removed, and you should use the name of the designtime control everywhere..

If you want to create it manually, you need atr least something like this.Controls.Add(m_printPreviewControl );

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