Geek Answers Handbook

Print static content from WebView in the Windows Store app

UPDATE 3

There is generosity on this issue. An example project and a brief description of the problem are at the bottom of the page under TL; DR; so save some reads and skip to the end!

...

I am trying to get this detailed, supported answer from JerryNixon, working using a statically loaded page via NavigateToString. I don’t understand why this should not work, but admittedly there are parts of the code that are completely confusing to me.

The original answer is here , but I will copy the code here for completeness. Jerry provides the following sample / solution for those who want to print withWebView

<Grid Background="Blue">
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="995" />
        <ColumnDefinition Width="300" />
        <ColumnDefinition />
    </Grid.ColumnDefinitions>
    <WebView Grid.Column="0" x:Name="MyWebView" Source="http://www.stackoverflow.com" HorizontalAlignment="Right" />
    <Rectangle Grid.Column="1" x:Name="MyWebViewRectangle" Fill="Red" />
    <ScrollViewer Grid.Column="2" HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Auto">
        <ItemsControl x:Name="MyPrintPages" VerticalAlignment="Top" HorizontalAlignment="Left">
            <Rectangle Height="150" Width="100" Fill="White" Margin="5" />
            <Rectangle Height="150" Width="100" Fill="White" Margin="5" />
            <Rectangle Height="150" Width="100" Fill="White" Margin="5" />
            <Rectangle Height="150" Width="100" Fill="White" Margin="5" />
            <Rectangle Height="150" Width="100" Fill="White" Margin="5" />
        </ItemsControl>
    </ScrollViewer>
</Grid>

public MainPage()
{
    this.InitializeComponent();
    MyWebView.LoadCompleted += MyWebView_LoadCompleted;
}

void MyWebView_LoadCompleted(object sender, NavigationEventArgs e)
{
    MyWebViewRectangle.Fill = GetWebViewBrush(MyWebView);
    MyPrintPages.ItemsSource = GetWebPages(MyWebView, new Windows.Foundation.Size(100d, 150d));
    MyWebView.Visibility = Windows.UI.Xaml.Visibility.Visible;
}

WebViewBrush GetWebViewBrush(WebView webView)
{
    // resize width to content
    var _OriginalWidth = webView.Width;
    var _WidthString = webView.InvokeScript("eval",
        new[] { "document.body.scrollWidth.toString()" });
    int _ContentWidth;
    if (!int.TryParse(_WidthString, out _ContentWidth))
        throw new Exception(string.Format("failure/width:{0}", _WidthString));
    webView.Width = _ContentWidth;

    // resize height to content
    var _OriginalHeight = webView.Height;
    var _HeightString = webView.InvokeScript("eval",
        new[] { "document.body.scrollHeight.toString()" });
    int _ContentHeight;
    if (!int.TryParse(_HeightString, out _ContentHeight))
        throw new Exception(string.Format("failure/height:{0}", _HeightString));
    webView.Height = _ContentHeight;

    // create brush
    var _OriginalVisibilty = webView.Visibility;
    webView.Visibility = Windows.UI.Xaml.Visibility.Visible;
    var _Brush = new WebViewBrush
    {
        SourceName = webView.Name,
        Stretch = Stretch.Uniform
    };
    _Brush.Redraw();

    // reset, return
    webView.Width = _OriginalWidth;
    webView.Height = _OriginalHeight;
    webView.Visibility = _OriginalVisibilty;
    return _Brush;
}

IEnumerable<FrameworkElement> GetWebPages(WebView webView, Windows.Foundation.Size page)
{
    // ask the content its width
    var _WidthString = webView.InvokeScript("eval",
        new[] { "document.body.scrollWidth.toString()" });
    int _ContentWidth;
    if (!int.TryParse(_WidthString, out _ContentWidth))
        throw new Exception(string.Format("failure/width:{0}", _WidthString));
    webView.Width = _ContentWidth;

    // ask the content its height
    var _HeightString = webView.InvokeScript("eval",
        new[] { "document.body.scrollHeight.toString()" });
    int _ContentHeight;
    if (!int.TryParse(_HeightString, out _ContentHeight))
        throw new Exception(string.Format("failure/height:{0}", _HeightString));
    webView.Height = _ContentHeight;

    // how many pages will there be?
    var _Scale = page.Width / _ContentWidth;
    var _ScaledHeight = (_ContentHeight * _Scale);
    var _PageCount = (double)_ScaledHeight / page.Height;
    _PageCount = _PageCount + ((_PageCount > (int)_PageCount) ? 1 : 0);

    // create the pages
    var _Pages = new List<Windows.UI.Xaml.Shapes.Rectangle>();
    for (int i = 0; i < (int)_PageCount; i++)
    {
        var _TranslateY = -page.Height * i;
        var _Page = new Windows.UI.Xaml.Shapes.Rectangle
        {
            Height = page.Height,
            Width = page.Width,
            Margin = new Thickness(5),
            Tag = new TranslateTransform { Y = _TranslateY },
        };
        _Page.Loaded += (s, e) =>
        {
            var _Rectangle = s as Windows.UI.Xaml.Shapes.Rectangle;
            var _Brush = GetWebViewBrush(webView);
            _Brush.Stretch = Stretch.UniformToFill;
            _Brush.AlignmentY = AlignmentY.Top;
            _Brush.Transform = _Rectangle.Tag as TranslateTransform;
            _Rectangle.Fill = _Brush;
        };
        _Pages.Add(_Page);
    }
    return _Pages;
}

- Source - MainPage()

var html = await Windows.Storage.PathIO.ReadTextAsync("ms-appx:///Assets/sherlock.html");
MyWebView.NavigateToString(html);

Sherlock.html - , The Red-Headed League, HTML- - , . ,

. (Sherlock.html )

, ( 4000 +), .a >

WebView

(. , )

. ( , , )

enter image description here

. , . Grid .p > . ( ), ( ). - .

, , . , . , Load_Completed

MyWebViewRectangle.Fill = GetWebViewBrush(MyWebView);
MyPrintPages.ItemsSource = GetWebPages(MyWebView, new Windows.Foundation.Size(100d, 150d));
MyWebView.Visibility = Windows.UI.Xaml.Visibility.Visible;

1: MyWebViewRectangle WebView. ? . , , , , ,

3: MyWebView.Visibility ​​ Visible , GetWebViewBrush.

var _OriginalVisibilty = webView.Visibility;
webView.Visibility = Windows.UI.Xaml.Visibility.Visible;
// and a few lines later... 
webView.Visibility = _OriginalVisibilty;

, - Collapsed, Visible .

- ( , ?) . , , . !

UPDATE

. WebView XAML. . , html 800px, . , , ? . ( The Red-headed league, ), . .

webView.Height = _ContentHeight; GetWebPages. , _ContentHeight "13241".

. , , , . , , WebView , .

, .

_ContentHeight 13230, . , . , , . , html 800 , . , - 800: 13230 ( 1:16.5375). , . GetWebPages 3 , . , WebView

, , .

MyWebViewRectangle MyPrintPages, :

Working result, but with extra whitespace and blank pages appended

. NateDiamond LongRunningScriptDetected, UnsafeContentWarningDisplaying UnviewableContentIdentified

: https://onedrive.live.com/redir?resid=EE99EF9560A6740E!110509&authkey=!ACrZgm6uq5k5yck&ithint=file%2czip

2

.

( "" ) , . 9 , 5 6. 9 GetWebPages, 5ish HTML.

nothing past page 5

(, , )

, . , 2 , , . . 9 , , .

:

Resize_WebView()

public void ResizeWebView()
{
    OriginalHeight = MyWebView.Height;

    var _WidthString = MyWebView.InvokeScript("eval", new[] { "document.body.scrollWidth.toString()" });
    int _ContentWidth;
    if (!int.TryParse(_WidthString, out _ContentWidth))
        throw new Exception(string.Format("failure/width:{0}", _WidthString));
    MyWebView.Width = _ContentWidth;

    // ask the content its height
    var _HeightString = MyWebView.InvokeScript("eval", new[] { "document.body.scrollHeight.toString()" });
    int _ContentHeight;
    if (!int.TryParse(_HeightString, out _ContentHeight))
        throw new Exception(string.Format("failure/height:{0}", _HeightString));
    MyWebView.Height = _ContentHeight;
}

MyWebView_LoadCompleted , ResizeWebView():

void MyWebView_LoadCompleted(object sender, NavigationEventArgs e)
{
    ResizeWebView();

    //MyWebViewRectangle.Fill = GetWebViewBrush(MyWebView);
    MyPrintPages.ItemsSource = GetWebPages(MyWebView, new Windows.Foundation.Size(300d, 450d));
}

in GetMyWebPages , :

IEnumerable<FrameworkElement> GetWebPages(WebView webView, Windows.Foundation.Size page) 
{
    // ask the content its width
    /*var _WidthString = webView.InvokeScript("eval",
        new[] { "document.body.scrollWidth.toString()" });
    int _ContentWidth;
    if (!int.TryParse(_WidthString, out _ContentWidth))
        throw new Exception(string.Format("failure/width:{0}", _WidthString));
    webView.Width = _ContentWidth;

    // ask the content its height
    var _HeightString = webView.InvokeScript("eval",
        new[] { "document.body.scrollHeight.toString()" });
    int _ContentHeight;
    if (!int.TryParse(_HeightString, out _ContentHeight))
        throw new Exception(string.Format("failure/height:{0}", _HeightString));
    webView.Height = _ContentHeight;

    // Manually set _ContentHeight: comment out the above block and uncomment this to test. 
    // int _ContentHeight = 13230;
    // webView.Height = _ContentHeight;*/

    // how many pages will there be?
    //var _Scale = page.Width / _ContentWidth;
    var _Scale = page.Width / webView.Width; // now sourced directly from webview
    //var _ScaledHeight = (_ContentHeight * _Scale); 
    var _ScaledHeight = (webView.Height * _Scale); // now sourced directly from webview
    var _PageCount = (double)_ScaledHeight / page.Height;
    _PageCount = _PageCount + ((_PageCount > (int)_PageCount) ? 1 : 0);

    // create the pages
    var _Pages = new List<Windows.UI.Xaml.Shapes.Rectangle>();
    for (int i = 0; i < (int)_PageCount; i++)
    {
        var _TranslateY = -page.Height * i;
        var _Page = new Windows.UI.Xaml.Shapes.Rectangle
        {
            Height = page.Height,
            Width = page.Width,
            Margin = new Thickness(5),
            Tag = new TranslateTransform { Y = _TranslateY },
        };
        var _Brush = GetWebViewBrush(webView);
        _Brush.Stretch = Stretch.UniformToFill;
        _Brush.AlignmentY = AlignmentY.Top;
        _Brush.Transform = _Page.Tag as TranslateTransform;
        _Page.Fill = _Brush;
        /*_Page.Loaded += async (s, e) =>
        {
            var _Rectangle = s as Windows.UI.Xaml.Shapes.Rectangle;
            var _Brush = await GetMyWebViewBrush(webView);
            _Brush.Stretch = Stretch.UniformToFill;
            _Brush.AlignmentY = AlignmentY.Top;
            _Brush.Transform = _Rectangle.Tag as TranslateTransform;
            _Rectangle.Fill = _Brush;
        };*/
        _Pages.Add(_Page);
    }
    return _Pages;
}

GetWebView

WebViewBrush GetWebViewBrush(WebView webView)
{
    /*// resize width to content
    var _OriginalWidth = webView.Width;
    var _WidthString = webView.InvokeScript("eval",
        new[] { "document.body.scrollWidth.toString()" });
    int _ContentWidth;
    if (!int.TryParse(_WidthString, out _ContentWidth))
        throw new Exception(string.Format("failure/width:{0}", _WidthString));
    webView.Width = _ContentWidth;

    // resize height to content
    var _OriginalHeight = webView.Height;
    var _HeightString = webView.InvokeScript("eval",
        new[] { "document.body.scrollHeight.toString()" });
    int _ContentHeight;
    if (!int.TryParse(_HeightString, out _ContentHeight))
        throw new Exception(string.Format("failure/height:{0}", _HeightString));
    webView.Height = _ContentHeight;

    // create brush
    var _OriginalVisibilty = webView.Visibility;
    webView.Visibility = Windows.UI.Xaml.Visibility.Visible;*/
    var _Brush = new WebViewBrush
    {
        SourceName = webView.Name,
        Stretch = Stretch.Uniform
    };
    _Brush.Redraw();

    // reset, return
    /*webView.Width = _OriginalWidth;
    webView.Height = _OriginalHeight;
    webView.Visibility = _OriginalVisibilty;*/
    return _Brush;
}

.

TL; DR;

. https://onedrive.live.com/redir?resid=EE99EF9560A6740E!110545&authkey=!AMcnB_0xKRhYHIc&ithint=file%2czip

. 9 .

  • GetWebPages ,
  • GetWebPages 1-5, 6 3

, , .

. , , , .

+4
2

[]

, , . , WebViewBrush. , ? , . , Surface pro. Surface pro Intel i.e. , ( ). , - .

, , , ? Surface Pro 1 , .

XAML-, . XAML , . . , XAML, . . , , , . 50 100 , , - . .

, - HTML-. . , - , ( Windows Store) Direct2D DirectWrite. "" . ( ). , , . - ++/CX, Direct2D, .

Direct2Dapp

, ,

, , . , . , , . , , WebView , , . XAML. D3D, .

, . , , , , . , XAML. RenderTargetBitmap . , WebView . RenderTargetBitmap . . ItemsControl bob .

GetWebPages:

async Task<bool> GetWebPages(WebView webView, Windows.Foundation.Size page)
{
    // how many pages will there be?
    var _Scale = page.Width / webView.Width; // now sourced directly from webview
    var _ScaledHeight = (webView.Height * _Scale); // now sourced directly from webview
    var _PageCount = (double)_ScaledHeight / page.Height;
    _PageCount = _PageCount + ((_PageCount > (int)_PageCount) ? 1 : 0);

    var _Brush = GetWebViewBrush(webView);

    for (int i = 0; i < (int)_PageCount; i++)
    {
        var _TranslateY = -page.Height * i;
        // You can probably optimize this bit
        _RenderSource.Height = page.Height;
        _RenderSource.Width = page.Width;
        Margin = new Thickness(5);

        _Brush.Stretch = Stretch.UniformToFill;
        _Brush.AlignmentY = AlignmentY.Top;
        _Brush.Transform = new TranslateTransform { Y = _TranslateY };
        _RenderSource.Fill = _Brush;

        RenderTargetBitmap rtb = new RenderTargetBitmap();

        await rtb.RenderAsync(_RenderSource);

        var _iPge = new Image
        {
            Source = rtb,
            Margin = new Thickness(10)
        };

        _Pages.Add(_iPge);
    }
    return true;
}

: http://1drv.ms/1y91iv7

, , .

PS pagenation, .

, ,

0

, UWP, , :

(1) :

WebViewBrush.Redraw() "" WebView. Redraw() . , await WebViewBrush WebView.

, , WebViewBrush . , .

(2) WebViewBrush:

. WebVewBrush , WebView 8000px. , , , .

: WebView JavaScript. .

(3)

, . WebView , 240 .

500 "" , Rectangle.

500- PDF MS Edge, , .

, ( , - ):

WebViewBrush.Redraw() ( UWP)?

0

More articles:


All Articles