Re: Blurry Borderline In FlowDocument - WPF Discussion Boards

Member 45210688-Nov-12 2:22

8-Nov-12 2:22

Let me explain the problem, I'm getting stuck in it

If I change the dpi settings from the dialog of Printing Preferences of a virtual printer like PDF Creator or any printer that allows to change this setting, and then set a breakpoint like the code below:

PrintDialog printDialog = new PrintDialog();
if ((bool)printDialog.ShowDialog().GetValueOrDefault())
{

        System.Printing.PrintCapabilities capabilities =  printDialog.PrintQueue.GetPrintCapabilities(printDialog.PrintTicket);
       ...... insert breakpoint here
 }

I can see that the properties printDialog.PrintTicket.PageResolution.X; and printDialog.PrintTicket.PageResolution.Y change values correctly while printDialog.PrintTicket.PageMediaSize.Width and printDialog.PrintTicket.PageMediaSize.Height don't change despite the printer resolution change... an A4 paper in portrait mode will always have PageMediaSize.Height = 1122.5196850393702 and PageMediaSize.Width = 793.70078740157476 no matter which resolution is set before ..... for WPF the unit size of these dimensions is set to 1/96th inch but when is Ok on screen because default screen resolution is 96 dpi on the other side is wrong on the printer because it has a different resolution, in other words confuting that Height and Width of the paper are read only properties if I cannot find the way to tell WPF that the unit size of the printer is not 1/96th inch but for example 1/300th inch (if on the printer I previously set 300 dpi ) there's absolutely no way to print at higher resolution than 96dpi

A last note, in my specific case I cannot use RenderTargetBitmap and then resize all to match printer's paper height and width settings because I'm printing high definition barcode images and it would cause an image rescaling that would make the barcode unreadable on final paper because i create it with the purpose to be printed with a resolution of 300dpi which without a resizing will result out of bounds because WPF is telling me the printer paper dimensions in the wrong unit size (1/96th inch) despite the real dpis prevoiusly set on printer

Hoping to have clarified enough the problem,

thanks in advance,
Dave

PS

A hint to reproduce the issue is doing a printing with PrintVisual or PrintDocument methods with different printer resolution set before in the PrintDialog, the output will always be the same

modified 8-Nov-12 13:50pm.

Re: Printing with more than 96 dpi in WPF

Super Lloyd14-Nov-12 16:16

Super Lloyd

14-Nov-12 16:16

Printing seems a tricky issue and I haven't done it in a while...
But at any rate I suspect it is correct. Because WPF doesn't use 'pixels' as unit of measure but.. 'device independent pixels' (or DIP for short), that means WPF will always think there are 96 DIP, whatever the DPI. And the underlying system will scale thing accordingly.

A train station is where the train stops. A bus station is where the bus stops. On my desk, I have a work station....
_________________________________________________________
My programs never have bugs, they just develop random features.

Re: Printing with more than 96 dpi in WPF

Member 452106819-Nov-12 22:26

Member 4521068

19-Nov-12 22:26

Hi Lloyd, thanks for the comment Smile | :)

The problem was resolved drawing directly the lines of the barcode in a Canvas
Since WPF thinks, draws (and also prints) vectorial it hasn't any problem handling vectorial shapes (at this point the real limit is only given by the printer's physical resolution), viceversa it could have problems handling raster images because it's not the way it's used to think and, like you said before it plainly translates bitmap pixels to WPF units without any sort of scale, so at 96DPIs (unless you set a different DPI value from Control Panel --> Display Settings but that's a different story and not a viable option in my case because printers are not monitors and will always have different resolutions).

modified 20-Nov-12 5:07am.

I have issues with the C# WPF WebBrowser class

Xarzu6-Nov-12 20:14

Xarzu

6-Nov-12 20:14

I have issues with the C# WPF WebBrowser class

I have a C# WPF application which uses a WebBrowser class. I have overwritten the LoadComplete method. The question I have is this. This method is supposed to be triggered when the class has completed a load, but , when I put a breakpoint on this method, it is called before the class visually has compleded a load. Because of this, the htmldata is not complete. Any ideas?

Maybe there is a different method I should overide. LoadComplete might not be the best choice. Maybe there is something that is the same as a "display complete".

Re: I have issues with the C# WPF WebBrowser class

Gerry Schmitz7-Nov-12 11:04

Gerry Schmitz

7-Nov-12 11:04

What do you mean when you say that "the htmldata is not complete"? You can access the mshtml.HTMLDocument object from the .Document property of the WebBrowser object in the LoadComplete event.

As for the "visuals", the page is rendered on the main UI thread. Since LoadComplete runs on the main UI thread (when the page has been loaded, but not yet displayed), the page will not display until LoadComplete exits ... unless you tell the thread's Dispatcher to process pending UI events (see DispatcherFrame in VS / C# Help).

Blurry Borderline In FlowDocument

FocusedWolf6-Nov-12 10:46

FocusedWolf

6-Nov-12 10:46

It seems no amount of SnapsToDevicePixels="True" and/or UseLayoutRounding="True" can make the border around a Paragraph sharp:

XML

<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <FlowDocumentReader>
        <FlowDocument>
        
            <Paragraph BorderBrush="Black" BorderThickness="1" Padding="10">
                <InlineUIContainer>
                    <Expander Header="An expander" >
                        <Button>A button</Button>
                    </Expander>
                </InlineUIContainer>
            </Paragraph>
            
            <Paragraph BorderBrush="Black" BorderThickness="1" Padding="10">
                <InlineUIContainer>
                    <Expander Header="An expander" >
                        <Button>A button</Button>
                    </Expander>
                </InlineUIContainer>
            </Paragraph>
            
            <Paragraph BorderBrush="Black" BorderThickness="1" Padding="10">
                <InlineUIContainer>
                    <Expander Header="An expander" >
                        <Button>A button</Button>
                    </Expander>
                </InlineUIContainer>
            </Paragraph>
            
        </FlowDocument>
    </FlowDocumentReader>
</Window>

However i can use RenderOptions.EdgeMode="Aliased" which makes the border sharp, but distorts the Expander:

XML

<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <FlowDocumentReader RenderOptions.EdgeMode="Aliased">
        <FlowDocument>
        
            <Paragraph BorderBrush="Black" BorderThickness="1" Padding="10">
                <InlineUIContainer>
                    <Expander Header="An expander" >
                        <Button>A button</Button>
                    </Expander>
                </InlineUIContainer>
            </Paragraph>
            
        </FlowDocument>
    </FlowDocumentReader>
</Window>

So, is there any way to make the border sharp without hurting the documents appearance? Big Grin | :-D

Re: Blurry Borderline In FlowDocument

Gerry Schmitz7-Nov-12 13:13

Gerry Schmitz

7-Nov-12 13:13

If you placed the Expanders (with a border) "outside" the FlowDocument (in a FrameworkElement), you could use UseLayoutRounding to get the effect you want.

As presented, I don't see why these expanders have to be inside a FlowDocument (which isn't a FrameworkElement).

Re: Blurry Borderline In FlowDocument

FocusedWolf7-Nov-12 16:00

FocusedWolf

7-Nov-12 16:00

Ok i figured out a way that works, although its a bit ugly:

XML

<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <FlowDocumentScrollViewer>
        <FlowDocument>
        
            <Paragraph>
                <InlineUIContainer>
                    
                    <Border BorderBrush="Black" BorderThickness="1" Padding="10" SnapsToDevicePixels="True">
                        <Expander>
                            <Expander.Header>
                                <TextBlock Text="An expander" Width="{Binding RelativeSource={RelativeSource AncestorType={x:Type Expander}}, Path=ActualWidth}" />
                            </Expander.Header>
                                                
                            <Button>A button</Button>
                        </Expander>                    
                    </Border>
                    
                </InlineUIContainer>
            </Paragraph>
            
        </FlowDocument>
    </FlowDocumentScrollViewer>
</Window>

As for why, my code is based on this: http://stackoverflow.com/questions/3798262/how-to-collapse-a-paragraph although i've been improving it. The idea is add or remove a paragraph block below the expander block based on the state of the expander. That + code to handle the copy to clipboard to convert the uielements to text (in this case, getting the header string of the expander) and the result is an interactive flowdocument with collapsing regions and copy support.

modified 7-Nov-12 23:32pm.

Binding in a WPF TreeViewItem

#realJSOP6-Nov-12 8:16

#realJSOP

6-Nov-12 8:16

I want my treeview items to change their appearance based on other properties within the object being represented by the treeview item. I've done the following within the treeview zaml:

XML

<TreeView.Resources>
    <Style TargetType="{x:Type TreeViewItem}">
        <Setter Property="Foreground" Value="{Binding Path=IsValid, Converter={StaticResource StatusInvalidConverter}}" />
        <Setter Property="HeaderTemplate">
            <Setter.Value>
                <DataTemplate>
                    <Grid>
                        <Border Grid.Column="0" x:Name="PART_ItemBorder" ... >
                            <StackPanel Orientation="Horizontal">
                                <Label Content="{Binding}"  />

                                /// my custom stuff is here
                                <Label Content="(NOT USED)" 
                                       Visibility="{Binding Path=IsReferenced, Converter={StaticResource MyConverter}}" 
                                       Foreground="Red" />
                        
                            </StackPanel>
                        </Border>
                    </Grid>
                </DataTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</TreeView.Resources>

I'm getting the following notification in the output window when I run the app in debug mode:

System.Windows.Data Error: 40 : BindingExpression path error: 'IsReferenced' property not found on 'object' ''String' (HashCode=1540110492)'. BindingExpression:Path=IsReferenced; DataItem='String' (HashCode=1540110492); target element is 'Label' (Name=''); target property is 'Visibility' (type 'Visibility')<br />

".45 ACP - because shooting twice is just silly" - JSOP, 2010
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