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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