[英]UWP richeditbox print multiple pages
我无法使用Richeditbox进行多页打印。 我在Xaml中有Richeditbox,名为Editor。 我使用自定义GetText()函数来获取Editor内的所有内容。 我已经可以单页打印,但不知道如何制作多页。
我试图查看Microsoft文档和此PrintHelper类 。 仍然我不确定如何将其实施到我的项目中。
所以主要的问题是我应该如何使用richeditbox打印多个页面?
下面是我的项目打印代码,是的,我知道有硬编码:printDoc.SetPreviewPageCount(1,PreviewPageCountType.Final); 但不知道我该如何计算这些页面
private PrintManager printMan;
private PrintDocument printDoc;
private IPrintDocumentSource printDocSource;
public MainPage()
{
InitializeComponent();
// Register for PrintTaskRequested event
printMan = PrintManager.GetForCurrentView();
printMan.PrintTaskRequested += PrintTaskRequested;
// Build a PrintDocument and register for callbacks
printDoc = new PrintDocument();
printDocSource = printDoc.DocumentSource;
printDoc.Paginate += Paginate;
printDoc.GetPreviewPage += GetPreviewPage;
printDoc.AddPages += AddPages;
}
private async void Print_Click(object sender, RoutedEventArgs e)
{
if (PrintManager.IsSupported())
{
try
{
// Show print UI
await PrintManager.ShowPrintUIAsync();
}
catch
{
// Printing cannot proceed at this time
ContentDialog noPrintingDialog = new ContentDialog()
{
Title = "Printing error",
Content = "\nSorry, printing can' t proceed at this time.",
PrimaryButtonText = "OK"
};
await noPrintingDialog.ShowAsync();
}
}
else
{
// Printing is not supported on this device
ContentDialog noPrintingDialog = new ContentDialog()
{
Title = "Printing not supported",
Content = "\nSorry, printing is not supported on this device.",
PrimaryButtonText = "OK"
};
await noPrintingDialog.ShowAsync();
}
}
private void PrintTaskRequested(PrintManager sender, PrintTaskRequestedEventArgs args)
{
// Create the PrintTask.
// Defines the title and delegate for PrintTaskSourceRequested
var printTask = args.Request.CreatePrintTask("Print", PrintTaskSourceRequrested);
// Handle PrintTask.Completed to catch failed print jobs
printTask.Completed += PrintTaskCompleted;
}
private void PrintTaskSourceRequrested(PrintTaskSourceRequestedArgs args)
{
// Set the document source.
args.SetSource(printDocSource);
}
private void Paginate(object sender, PaginateEventArgs e)
{
printDoc.SetPreviewPageCount(1, PreviewPageCountType.Final);
}
private void GetPreviewPage(object sender, GetPreviewPageEventArgs e)
{
string text = GetText(); ;
RichEditBox richTextBlock = new RichEditBox();
richTextBlock.Document.SetText(TextSetOptions.FormatRtf, text);
richTextBlock.Background = new SolidColorBrush(Windows.UI.Colors.White);
printDoc.SetPreviewPage(e.PageNumber, richTextBlock);
}
private void AddPages(object sender, AddPagesEventArgs e)
{
string text = GetText(); ;
RichEditBox richTextBlock = new RichEditBox();
richTextBlock.Document.SetText(TextSetOptions.FormatRtf, text);
richTextBlock.Background = new SolidColorBrush(Windows.UI.Colors.White);
richTextBlock.Padding = new Thickness(20,20,20,20);
printDoc.AddPage(richTextBlock);
// Indicate that all of the print pages have been provided
printDoc.AddPagesComplete();
}
private async void PrintTaskCompleted(PrintTask sender, PrintTaskCompletedEventArgs args)
{
// Notify the user when the print operation fails.
if (args.Completion == PrintTaskCompletion.Failed)
{
await CoreApplication.MainView.CoreWindow.Dispatcher.RunAsync(CoreDispatcherPriority.Normal, async () =>
{
ContentDialog noPrintingDialog = new ContentDialog()
{
Title = "Printing error",
Content = "\nSorry, failed to print.",
PrimaryButtonText = "OK"
};
await noPrintingDialog.ShowAsync();
});
}
}
RichTextBlock具有OverflowContentTarget属性。 您应该在那里指定RichTextBlockOverflow控件。 RichTextBlockOverflow控件也可能具有OverflowContentTarget。 因此,您添加了其他页面,并查看它是否具有溢出内容。 不适合页面的内容将流入下一个溢出控件,依此类推。 因此,您可以一页一页地渲染页面,直到没有任何溢出为止,此时您就知道页面数。
正是我所说的,但在他们的官方文档中 :
lastRTBOOnPage = AddOnePrintPreviewPage(null, pageDescription);
// We know there are more pages to be added as long as the last RichTextBoxOverflow added to a print preview
// page has extra content
while (lastRTBOOnPage.HasOverflowContent && lastRTBOOnPage.Visibility == Windows.UI.Xaml.Visibility.Visible)
{
lastRTBOOnPage = AddOnePrintPreviewPage(lastRTBOOnPage, pageDescription);
}
微软文档跳过重点,难以理解。 关于印刷的最佳文档是Diederic Krols撰写的此博客 。 他还写了一篇不错的文章 ,介绍如何从ItemsControl打印。 (但更高级)用于Windows 8,但自那时以来API一直没有改变。
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