WPF 打印以适合页面 [英] WPF Printing to fit page

问题描述

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

i searched for options how to print WPF controls and found some solutions. I do need to fit my printed control to printing page while preserving aspect ration (my control is square; sudoku grid).

我找到了一个解决方案，可以调整控件的大小和位置以适应页面.效果很好，但它也会重新定位我的窗口上的控件.

I found a solution that resizes and repositions control to fit a page. That works well, but it also repositions that control on my window.

这是我用于打印和缩放的代码:

here is the code i use for print and scaling :

        //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());

我尝试了两种方法来解决这个问题:

I tried two aproaches to solve this:

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

1. Clone my control and then transform cloned one, unaffecting original. Didnt work, for some reason i ended with exception: The provided DependencyObject is not a context for this Freezable, but oddly only in some cases.

还原大小和位置更改.我尝试调用 InvalidateArrange() 方法，该方法似乎有效，但仅在第一次调用 print 方法期间.在第二次通话中，它没有工作.

Revert size and position changes. I tried calling InvalidateArrange() method, which seemed to work, but only during first call of print method. During second call, it didnt work.

我该怎么办，任何想法<谢谢.

What should i do please, any ideas< thank you.

推荐答案

我知道这个问题很老，但我自己正在寻找解决这个问题的方法.这是我目前使用的解决方案.我存储针对框架元素的原始转换，然后在打印完成后重新应用它.

I know this question is quite old but looking for a solution to this problem myself. Here is the solution I am currently using. I store the original transformation against the framework element and then reapply it after the printing has finished.

    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;
        }
    }

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