WPF打印以适合页面

Question

我搜索了如何打印WPF控件的选项,并找到了一些解决方案.我需要将我的打印控件适合打印页面,同时保留纵横比(我的控件是方形;数独网格).

我找到了一个解决方案,它调整大小并重新定位控件以适应页面.这很好,但它也重新定位了我的窗口控制.

这是我用于打印和缩放的代码:

        //get selected printer capabilities
            System.Printing.PrintCapabilities capabilities = dialog.PrintQueue.GetPrintCapabilities(dialog.PrintTicket);
        //get scale of the print wrt to screen of WPF visual
        double scale = Math.Min(capabilities.PageImageableArea.ExtentWidth / mrizka.ActualWidth, capabilities.PageImageableArea.ExtentHeight / mrizka.ActualHeight);

        //Transform the Visual to scale
        mrizka.LayoutTransform = new ScaleTransform(scale, scale);

        //get the size of the printer page
        Size sz = new Size(capabilities.PageImageableArea.ExtentWidth, capabilities.PageImageableArea.ExtentHeight);

        //update the layout of the visual to the printer page size.
        mrizka.Measure(sz);
        mrizka.Arrange(new Rect(new Point(capabilities.PageImageableArea.OriginWidth, capabilities.PageImageableArea.OriginHeight), sz));

        dialog.PrintVisual(mrizka, mrizka.getID().ToString());

我尝试了两个方法来解决这个问题:

1. 克隆我的控制,然后转换克隆的一个,不影响原始.没有工作,由于某种原因我以异常结束:提供的DependencyObject不是这个Freezable的上下文,但奇怪的是仅在某些情况下.

2. 恢复大小和位置更改.我尝试调用InvalidateArrange()方法,这似乎有效,但只在第一次调用print方法时才有效.在第二次通话期间,它没有工作.

我应该做什么,任何想法<谢谢你.

Answer 1

我知道这个问题很老,但我自己也在寻找解决这个问题的方法.这是我目前使用的解决方案.我将原始转换存储在框架元素中,然后在打印完成后重新应用它.

    private void Print(Visual v)
    {

        System.Windows.FrameworkElement e = v as System.Windows.FrameworkElement ;
        if (e == null)
            return;

        PrintDialog pd = new PrintDialog();
        if (pd.ShowDialog() == true)
        {
            //store original scale
            Transform originalScale = e.LayoutTransform;
            //get selected printer capabilities
            System.Printing.PrintCapabilities capabilities = pd.PrintQueue.GetPrintCapabilities(pd.PrintTicket);

            //get scale of the print wrt to screen of WPF visual
            double scale = Math.Min(capabilities.PageImageableArea.ExtentWidth / e.ActualWidth, capabilities.PageImageableArea.ExtentHeight /
                           e.ActualHeight);

            //Transform the Visual to scale
            e.LayoutTransform = new ScaleTransform(scale, scale);

            //get the size of the printer page
            System.Windows.Size sz = new System.Windows.Size(capabilities.PageImageableArea.ExtentWidth, capabilities.PageImageableArea.ExtentHeight);

            //update the layout of the visual to the printer page size.
            e.Measure(sz);
            e.Arrange(new System.Windows.Rect(new System.Windows.Point(capabilities.PageImageableArea.OriginWidth, capabilities.PageImageableArea.OriginHeight), sz));

            //now print the visual to printer to fit on the one page.
            pd.PrintVisual(v, "My Print");

            //apply the original transform.
            e.LayoutTransform = originalScale;
        }
    }