> Hi Richard,
>
> Based on my understanding, your winform application is using
> PrintPreviewControl. Now, you want to allow the user to select portion of
> the preview image and pop up a context menu for other customized functions.
> If I have misunderstood you, please feel free to tell me, thanks.
>
> Yes, there is no build-in support for this feature. PrintPreviewControl
> internally uses a MetaFile to capture the real printing output, then it
> will paint the MetaFile on the control interface based on the Zoom
> property.
>
> However, PrintPreviewControl is not sealed, which means we can inherit from
> this class and provide some customized function ourselves. For example, to
> implement the selection function, the normal algorithm is recording the
> selection start point in OnMouseDown method of PrintPreviewControl, then in
> OnMouseUp method, we can record the end point. In the OnPaint method, we
> can use these 2 points to draw the selection rectangle. This logic is not
> hard to implement.
>
> I have written a little sample project to demonstrate the algorithm:
>
> internal MyPrintPreviewControl MyPrintPreviewControl1;
> private System.Drawing.Printing.PrintDocument docToPrint =
>     new System.Drawing.Printing.PrintDocument();
>
> private void button1_Click(object sender, System.EventArgs e)
> {
>     // Construct the MyPrintPreviewControl.
>     this.MyPrintPreviewControl1 = new MyPrintPreviewControl();
>
>     // Set location, name, and dock style for MyPrintPreviewControl1.
>     this.MyPrintPreviewControl1.Location = new Point(88, 80);
>     this.MyPrintPreviewControl1.Name = "MyPrintPreviewControl1";
>     this.MyPrintPreviewControl1.Dock = DockStyle.Fill;
>
>     // Set the Document property to the PrintDocument
>     // for which the PrintPage event has been handled.
>     this.MyPrintPreviewControl1.Document = docToPrint;
>
>     // Set the zoom to 25 percent.
>     this.MyPrintPreviewControl1.Zoom = 1;
>
>     // Set the UseAntiAlias property to true so fonts are smoothed
>     // by the operating system.
>     this.MyPrintPreviewControl1.UseAntiAlias = true;
>
>     // Add the control to the form.
>     this.Controls.Add(this.MyPrintPreviewControl1);
>
>     // Associate the event-handling method with the
>     // document's PrintPage event.
>     this.docToPrint.PrintPage +=
>         new System.Drawing.Printing.PrintPageEventHandler(
>         docToPrint_PrintPage);
> }
>
> // The MyPrintPreviewControl will display the document
> // by handling the documents PrintPage event
> private void docToPrint_PrintPage(
>     object sender, System.Drawing.Printing.PrintPageEventArgs e)
> {
>
>     // Insert code to render the page here.
>     // This code will be called when the control is drawn.
>
>     // The following code will render a simple
>     // message on the document in the control.
>     string text = "In docToPrint_PrintPage method.";
>     System.Drawing.Font printFont =
>         new Font("Arial", 35, FontStyle.Regular);
>
>     e.Graphics.DrawString(text, printFont,
>         Brushes.Black, 10, 10);
> }
>
> public class MyPrintPreviewControl: PrintPreviewControl
> {
>     Point pt_start;
>     Point pt_end;
>     bool drawSelection=false;
>     protected override void OnMouseDown(MouseEventArgs e)
>     {
>         if(Control.MouseButtons==MouseButtons.Left)
>         {
>             drawSelection=true;
>             pt_start=new Point(e.X, e.Y);
>         }
>         else
>         {
>             drawSelection=false;
>         }
>        
>         base.OnMouseDown (e);
>     }
>
>     protected override void OnMouseUp(MouseEventArgs e)
>     {
>         pt_end=new Point(e.X, e.Y);
>         base.OnMouseUp (e);
>         this.Invalidate();
>     }
>
>     protected override void OnPaint(PaintEventArgs e)
>     {       
>         base.OnPaint (e);
>         if(drawSelection)
>         {
>             e.Graphics.DrawRectangle(new Pen(new SolidBrush(Color.Red)),
>                 new Rectangle(pt_start, new Size(pt_end.X-pt_start.X,
> pt_end.Y-pt_start.Y)));
>         }
>     }
> }
>
> You may customize my sample code snippet and fit in your application.
>
> To implement the right click context menu function, you may add the
> ContextMenu component in the winform project and associate it with the
> PrintPreviewControl(set PrintPreviewControl.ContextMenu property).
>
> Hope this helps.
>
> Best regards,
> Jeffrey Tan
> Microsoft Online Community Support
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