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Национальный университет Львовская политехника

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[НЕСОРТИРОВАННОЕ]

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C# ПІДРУЧНИКИ / c# / Manning - Windows.forms.programming.with.c#.pdf

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►Содержание►

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While this may not be the prettiest image printing application, it does demonstrate some important principles, such as using the page margins and text wrapping. We will present the changes in two parts, one for each of our ParentForm and MainForm objects.

18.1.1USING THE PRINT CLASSES

The parent form will make direct use of the print classes previously mentioned, contain the menu items for printing, and maintain the required PrintDocument object. Placing the print document on the parent form ensures that any changes made to the page margins or other document settings are seen by all child forms in the application.

The following tables detail the changes required on the parent form.

Set the version number for the MyPhotos application to 18.1.

MODIFY PARENT FORM TO SUPPORT PRINT MENUS

					Action			Result

1	In the ParentForm.cs [Design] window, add
	three menus and a separator to the File
	menu.
					Settings

		Menu			Property		Value
		separator			MergeOrder		6
		Page			(Name)		menuPageSetup
		Setup			MergeOrder‘		7
					MergeOrder‘		7
					Text		Page Set&up…
		Print			(Name)		menuPrintPreview
		Preview			MergeOrder		7
					MergeOrder		7
					Text		Print Pre&view
		Print			(Name)		menuPrint
					MergeOrder		7
					Shortcut		CtrlP
					Text		&Print…


2	Also drag a PrintDocument object onto the
	form.
					Settings

			Property				Value
				(Name)			printDoc
			DocumentName			Image Document
	The object appears in the component tray of
	the designer window.

PRINTING

605

These menus provides the necessary user interface support. Next we hook up our three print menus in the ParentForm class.

HANDLE PRINT RELATED MENUS IN PARENT FORM

	Action	Result

3	Add a Click event handler for the	private void menuPageSetup_Click
	Page Setup menu to display a	(object sender, System.EventArgs e)
	PageSetupDialog window for the	{
	PageSetupDialog window for the	PageSetupDialog dlg
	form’s print document.	PageSetupDialog dlg
	form’s print document.	= new PageSetupDialog();
		dlg.Document = printDoc;
		dlg.ShowDialog();
		}

4	Add a Click event handler for the	private void menuPrintPreview_Click
	Print Preview menu to display a	(object sender, System.EventArgs e)
	PrintPreviewDialog window for	{
	PrintPreviewDialog window for	PrintPreviewDialog dlg
	the form’s print document.	PrintPreviewDialog dlg
	the form’s print document.	= new PrintPreviewDialog();
	Note: The PrintPreviewDialog	dlg.Document = printDoc;
	Note: The PrintPreviewDialog	dlg.ShowDialog();
	window displays the document to	dlg.ShowDialog();
	window displays the document to	}
	be printed within a PrintPreview-
	Control object contained within
	the preview window.

5	Add a Click event handler for the	private void menuPrint_Click
	Print menu to display a PrintDialog	(object sender, System.EventArgs e)
	window for the form’s print	{
	window for the form’s print	PrintDialog dlg = new PrintDialog();
	document.	PrintDialog dlg = new PrintDialog();
	document.	dlg.Document = printDoc;
	Note: The common print dialog	if (dlg.ShowDialog() == DialogResult.OK)
	Note: The common print dialog	{
	allows the user to select standard	{
	allows the user to select standard	printDoc.Print();
	settings such as which printer to use	}
	and the number of copies to make.	}
	If the user clicks the OK button, then
	we invoke the Print method in the
	PrintDocument class to initiate the
	actual print operation.

6	Handle the PrintPage event for the	private void printDoc_PrintPage
	PrintDocument object on the parent	(object sender, System.Drawing.
	form.	Printing.PrintPageEventArgs e)
	form.	{
		{
	Note: This event occurs for each
	page to be printed. The BeginPrint
	and EndPrint events occur at the
	start and end of the entire print
	operation, respectively.

7	In this handler:	MainForm f = ActiveMdiChild as MainForm;
	a. If the active child is a MainForm	if (f != null)
	a. If the active child is a MainForm	f.PrintCurrentImage(e);
	object, call the yet-to-be-written	else
	PrintCurrentImage method on	e.Cancel = true;
	this object.	}
	this object.
	b. Otherwise, cancel the print
	operation.

606	CHAPTER 18 ODDS AND ENDS .NET

These event handlers establish the required printing support for the parent form. The printing logic for the child form is presented next.

18.1.2DRAWING A PRINT PAGE

With our user interface logic in place, we are ready to implement the printing of a page. This is done using the PrintPageEventArgs parameter provided to the PrintPage event handler. This class is summarized in .NET Table 18.1.

.NET Table 18.1 PrintPageEventArgs class

The PrintPageEventArgs class represents an event argument containing information required for printing pages to a printer. This class is part of the System.Drawing.Printing namespace, and inherits from the System.EventArgs class.

	Cancel	Gets or sets whether the print job should be
		cancelled.
	Graphics	Gets the Graphics object on which to paint the
		page to print.
	HasMorePages	Gets or sets whether an additional page should
		be printed after the current one.
Public Properties
	MarginBounds	Gets the printable area of a page, which is the
		rectangle within the margins of the page.
	PageBounds	Gets the page area, which is the rectangle
		representing the entire page.
	PageSettings	Gets the PageSettings object representing the
		settings for the current page.

We will implement a PrintCurrentImage method in the MainForm class to make use of this parameter. Internally, this will draw the photograph using the provided Graphics object, and use an internal PrintTextString method to draw the individual properties for the photograph.

IMPLEMENT THE PRINTCURRENTIMAGE METHOD

	Action	Result

1	In the MainForm.cs code	using System.Drawing.Printing;
	window, indicate that we will
	use members of the
	System.Drawing.Printing
	namespace.

2	Add a PrintCurrentImage	public void PrintCurrentImage
	method that accepts a	(PrintPageEventArgs e)
	PrintPageEventArgs object as	{
	PrintPageEventArgs object as
	a parameter.

PRINTING

607

IMPLEMENT THE PRINTCURRENTIMAGE METHOD (continued)

	Action	Result

3	If there is no current photo, then	Photograph photo = _album.CurrentPhoto;
	abort the print operation.	if (photo == null)
		{
		// nothing to print, so abort
		e.Cancel = true;
		return;
		}

4	Otherwise, create some	// Establish some useful shortcuts
	shortcuts for the margins of the	float leftMargin = e.MarginBounds.Left;
	page and the Graphics object.	float rightMargin = e.MarginBounds.Right;
	page and the Graphics object.	float topMargin = e.MarginBounds.Top;
		float topMargin = e.MarginBounds.Top;
		float bottomMargin
		= e.MarginBounds.Bottom;
		float printableWidth = e.MarginBounds.Width;
		float printableHeight
		= e.MarginBounds.Height;
		Graphics g = e.Graphics;

5	Create a Font object:	Font printFont
	a. Use 11 point Times New	= new Font("Times New Roman", 11);
	a. Use 11 point Times New	float fontHeight = printFont.GetHeight(g);
	Roman.	float spaceWidth = g.MeasureString(" ",
	b. Use the GetHeight method	printFont).Width;
	b. Use the GetHeight method
	to determine the height of
	each line of text.
	c. Use the MeasureString
	method to determine the size
	of a space.

6	Determine the correct length so	// Draw image in box 75% of shortest side
	that the image can be drawn	float imageBoxLength;
	into a box which is 75% of the	float xPos = leftMargin;
	into a box which is 75% of the	float yPos = topMargin + fontHeight;
	shortest side of the page.	float yPos = topMargin + fontHeight;
	shortest side of the page.	if (printableWidth < printableHeight)
	Note: This logic accounts for	{
	Note: This logic accounts for	imageBoxLength = printableWidth * 75/100;
	both landscape and portrait	imageBoxLength = printableWidth * 75/100;
	both landscape and portrait	yPos += imageBoxLength;
	page orientation. The xPos and	}
	yPos variables represent where	else
	the first line of text should be	{
	the first line of text should be	imageBoxLength = printableHeight * 75/100;
	drawn.	imageBoxLength = printableHeight * 75/100;
	drawn.	xPos += imageBoxLength + spaceWidth;
		}

7	Draw the image into a box of the	// Draw image at start of the page
	determined size.	Rectangle imageBox
		= new Rectangle((int)leftMargin + 1,
		(int)topMargin + 1,
		(int)imageBoxLength,
		(int)imageBoxLength);
		g.DrawImage(photo.Image,
		photo.ScaleToFit(imageBox));

8	Determine the RectangleF	// Determine rectangle for text
	object where all text should be	RectangleF printArea
	drawn.	= new RectangleF(xPos, yPos,
	drawn.	rightMargin - xPos,
		rightMargin - xPos,
		bottomMargin - yPos);

608	CHAPTER 18 ODDS AND ENDS .NET

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