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  • WPF: When is a WrapPanel full.

    - by rathkopf
    I'm using a WrapPanel to display variable height items in columns. The wrappanel has a constrained size. Is there an way to determine when the WrapPanel is 'full'? I will then page to another panel with an animation. I've looked at the ArrangeOverride of the items that are the panels children, but they always seem to be getting all the space they want. I need a way to determine when they begin getting clipped.

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  • WPF application in a one window

    - by lukas
    I would like to make an application in a one window using XAML. It should be like a slideshow with next and back button. One idea is to make 4 panels and have just one enable at the time. Is there any other way to do this? Like dynamic loading of other XAML? is it the BackgroundWorker mandatory to use with WPF (hence is DirectX rendered there's almost no GUI lags) ?

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  • How do I make an ellipse blink?

    - by MedicineMan
    I am trying to make a custom control in WPF. I want it to simulate the behavior of a LED that can blink. There are three states to the control: On, Off, and Blinking. I know how to set On and Off through the code behind, but this WPF animation stuff is just driving me nuts!!!! I cannot get anything to animate whatsoever. The plan is to have a property called state. When the user sets the value to blinking, I want the control to alternate between green and grey. I'm assuming I need a dependency property here, but have no idea. I had more xaml before but just erased it all. it doesn't seem to do anything. I'd love to do this in the most best practice way possible, but at this point, I'll take anything. I'm half way to writing a thread that changes the color manually at this point. <UserControl x:Class="WpfAnimation.LED" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Height="300" Width="300"> <Grid> <Ellipse x:Name="MyLight" Height="Auto" Width="Auto"/> </Grid> </UserControl>

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  • Using data binding on value which is a FrameworkElement

    - by JaredPar
    One of my data sources produces a collection of values which are typed to the following interface public interface IData { string Name { get; } FrameworkElement VisualElement { get; } } I'd like to use data binding in WPF to display a collection of IData instances in a TabControl where the Name value becomes the header of the tab and the VisualElement value is displayed as the content of the corresponding tab. Binding the header is straight forward. I'm stuck though on how to define a template which allows me to display the VisualElement value. I've tried a number of solutions with little success. My best attempt is as follows. <TabControl ItemsSource="{Binding}"> <TabControl.ItemTemplate> <DataTemplate> <Label Content="{Binding Name}"/> </DataTemplate> </TabControl.ItemTemplate> <TabControl.ContentTemplate> <DataTemplate> How do I display VisualElement here? </DataTemplate> </TabControl.ContentTemplate> </TabControl> I'm still very new to WPF so I could be missing the obvious here.

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  • Drawing a WPF UserControl with DataBinding to an Image

    - by LorenVS
    Hey Everyone, So I'm trying to use a WPF User Control to generate a ton of images from a dataset where each item in the dataset would produce an image... I'm hoping I can set it up in such a way that I can use WPF databinding, and for each item in the dataset, create an instance of my user control, set the dependency property that corresponds to my data item, and then draw the user control to an image, but I'm having problems getting it all working (not sure whether databinding or drawing to the image is my problem) Sorry for the massive code dump, but I've been trying to get this working for a couple of hours now, and WPF just doesn't like me (have to learn at some point though...) My User Control looks like this: <UserControl x:Class="Bleargh.ImageTemplate" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:c="clr-namespace:Bleargh" x:Name="ImageTemplateContainer" Height="300" Width="300"> <Canvas> <TextBlock Canvas.Left="50" Canvas.Top="50" Width="200" Height="25" FontSize="16" FontFamily="Calibri" Text="{Binding Path=Booking.Customer,ElementName=ImageTemplateContainer}" /> <TextBlock Canvas.Left="50" Canvas.Top="100" Width="200" Height="25" FontSize="16" FontFamily="Calibri" Text="{Binding Path=Booking.Location,ElementName=ImageTemplateContainer}" /> <TextBlock Canvas.Left="50" Canvas.Top="150" Width="200" Height="25" FontSize="16" FontFamily="Calibri" Text="{Binding Path=Booking.ItemNumber,ElementName=ImageTemplateContainer}" /> <TextBlock Canvas.Left="50" Canvas.Top="200" Width="200" Height="25" FontSize="16" FontFamily="Calibri" Text="{Binding Path=Booking.Description,ElementName=ImageTemplateContainer}" /> </Canvas> </UserControl> And I've added a dependency property of type "Booking" to my user control that I'm hoping will be the source for the databound values: public partial class ImageTemplate : UserControl { public static readonly DependencyProperty BookingProperty = DependencyProperty.Register("Booking", typeof(Booking), typeof(ImageTemplate)); public Booking Booking { get { return (Booking)GetValue(BookingProperty); } set { SetValue(BookingProperty, value); } } public ImageTemplate() { InitializeComponent(); } } And I'm using the following code to render the control: List<Booking> bookings = Booking.GetSome(); for(int i = 0; i < bookings.Count; i++) { ImageTemplate template = new ImageTemplate(); template.Booking = bookings[i]; RenderTargetBitmap bitmap = new RenderTargetBitmap( (int)template.Width, (int)template.Height, 120.0, 120.0, PixelFormats.Pbgra32); bitmap.Render(template); BitmapEncoder encoder = new PngBitmapEncoder(); encoder.Frames.Add(BitmapFrame.Create(bitmap)); using (Stream s = File.OpenWrite(@"C:\Code\Bleargh\RawImages\" + i.ToString() + ".png")) { encoder.Save(s); } } EDIT: I should add that the process works without any errors whatsoever, but I end up with a directory full of plain-white images, not text or anything... And I have confirmed using the debugger that my Booking objects are being filled with the proper data... EDIT 2: Did something I should have done a long time ago, set a background on my canvas, but that didn't change the output image at all, so my problem is most definitely somehow to do with my drawing code (although there may be something wrong with my databinding too)

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  • WPF: Updating visibility of controls not updating the screen

    - by Brad McBride
    I will preface this by stating that I am new to WPF programming and may be making multiple errors. Any insight that can be provided to help me improve in my skills are greatly appreciated. I am working with a WPF application and am looping through a list of objects that contain properties that describe a document that should be built on the fly and automatically printed. I am attempting to display a small grid in the interface that shows the document being built before it is printed. This serves two purposes: one, it allows the user to see work being done by the application. Two, it renders the items on the screen so that I can then have something to actually print since WPF appears to not be able to load an image for printing dynamicaly without displaying it on the screen. In my code, I am setting the various elements in the grid and setting the visibility to visible. However, the UI is not updating and the printed document doesn't look as intended since the image never shows up on the screen. Here is the XAML that I have set up <Grid x:Name="LayoutRoot" Background="Black"> <Grid Name="previewGrid" Grid.Row="1" Grid.Column="1" Background="White" Visibility="Hidden"> <Canvas Name="pageCanvas" HorizontalAlignment="Center" VerticalAlignment="Center"> <Grid Name="pageGrid" Width="163" Height="211"> <Grid.ColumnDefinitions> <ColumnDefinition Width="81.5"></ColumnDefinition> <ColumnDefinition Width="81.5"></ColumnDefinition> </Grid.ColumnDefinitions> <TextBlock Grid.Column="0" Name="copyright" TextAlignment="Center" HorizontalAlignment="Center" VerticalAlignment="Bottom"></TextBlock> <Image Name="pageImage" Grid.Column="1" HorizontalAlignment="Center" VerticalAlignment="Center"></Image> </Grid> </Canvas> .....canvas for pages 2-4 not shown but structure is the same as for pageGrid..... </Grid> </Grid> </Window> Here is the code behind that is supposed to set the elements. previewGrid.Visibility = Windows.Visibility.Visible pageURI = New Uri(pageCollection(i).iamgeURL, UriKind.Absolute) pageGrid.Visibility = Windows.Visibility.Visible bmp.BeginInit() bmp.StreamSource = getCachedURLStream(cardURI) bmp.EndInit() pageImage.Source = bmp copyright.Text = copyrightText cardPreviewGrid.UpdateLayout() ' More code that prints the visual element pageGrid previewGrid.Visibility = Windows.Visibility.Hidden The code in codebehind loops through a number of times depending on how many different documents the user prints. Basically it builds a visual element for a page, prints an XPS version of it and then builds the next page and prints it, etc. Once all pages have been processed, the job is actually sent to the printer. The only purpose of this application is to let the user print these documents so there is not other task that they can do in the application while the documents print. I thought that putting this task in a background thread would help to update the UI but since I am trying to manipulate items directly on the UI thread it would appear that this option won't work for me. What am I doing wrong here and how can I improve the code so that I can get the behavior that I am trying to achieve?

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  • How can I anchor a textbox in wpf ?

    - by csuporj
    I have a window with tabs. On one of the tabs, I have a layout like below. (In fact it is more complicated, I have 4 text boxes in a row, and I have more rows.) How can I make the 3rd textbox have the width of the label + the width of the text box above, that is, to have them properly aligned ? The problem is that WPF widens the 3rd textbox, when I type text into it. Using hardcoded numbers for the sizes defeats the whole purpose of WPF. I could do that way 10 times faster in Windows Forms than in WPF. Is there a better way, than using a grid for each set of consecutive small text boxes, having to skip the large ones from the grid, because putting them in messes up everything. <Window x:Class="WpfApplication1.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MainWindow" Height="350" Width="525"> <Window.Resources> <Style TargetType="{x:Type Label}"> <Setter Property="VerticalAlignment" Value="Center"/> </Style> <Style TargetType="{x:Type TextBox}"> <Setter Property="VerticalAlignment" Value="Center"/> <Setter Property="Margin" Value="3"/> </Style> <Style x:Key="SmallTextBox" TargetType="{x:Type TextBox}" BasedOn="{StaticResource {x:Type TextBox}}"> <Setter Property="Width" Value="50"/> </Style> </Window.Resources> <StackPanel VerticalAlignment="Top" HorizontalAlignment="Left" Width="{Binding ElementName=grid,Path=ActualWidth}" Grid.IsSharedSizeScope="True"> <Grid Name="grid" HorizontalAlignment="Left"> <Grid.ColumnDefinitions> <ColumnDefinition Width="Auto" SharedSizeGroup="c1"/> <ColumnDefinition Width="Auto" SharedSizeGroup="c2"/> </Grid.ColumnDefinitions> <Grid.RowDefinitions> <RowDefinition Height="Auto"/> <RowDefinition Height="Auto"/> </Grid.RowDefinitions> <Label Content="Foo:"/> <TextBox Grid.Column="1" Style="{StaticResource SmallTextBox}"/> <Label Grid.Row="1" Content="Foobar:"/> <TextBox Grid.Row="1" Grid.Column="1" Style="{StaticResource SmallTextBox}"/> </Grid> <TextBox Grid.Row="1"/> <Grid Name="grid2" HorizontalAlignment="Left"> <Grid.ColumnDefinitions> <ColumnDefinition Width="Auto" SharedSizeGroup="c1"/> <ColumnDefinition Width="Auto" SharedSizeGroup="c2"/> </Grid.ColumnDefinitions> <Label Content="Bar:"/> <TextBox Grid.Column="1" Style="{StaticResource SmallTextBox}"/> </Grid> </StackPanel> </Window>

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  • Telerik Reporting introduces WPF Report Viewer, the first reporting tool supporting all .NET desktop

    With the release of Telerik Reporting Q1 2010 Service Pack 1 we are proud to announce a very important addition to Telerik Reporting. Finally, our suite of report viewers is now complete, making Telerik Reporting the first reporting tool to support all .NET desktop and web platforms: ASP.NET, Silverlight (incl. out-of-browser support), Windows Forms, and WPF. The newest member of the viewer family is the WPF Report Viewer which allows developers to deliver reports produced by Telerik Reporting to any rich application developed with WPF. The viewer supports all functionality available in the ASP.NET, Silverlight and Win Viewers,  including printing and exporting to all supported formats. Here is a quick overview of the most important features (in WPF disguise): Different technology, same report The WPF Viewer is tightly integrated with Telerik Reporting and as such uses the same powerful reporting engine, which guarantees that you will ...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • Dialog Box Property Value Editor

    - by Cicik
    hello, i am new to WPF and i want to create user control with Dialog Box Property Value Editor in VB.NET. i find this example in C# and rewrite it to VB.NET but it does not work. Is creating property value editor in VB.NET somehow special, because i can`t find examples in VB.NET thanks a lot

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  • Silverlight 3 Binding to the Current Item in a Collection

    - by rasx
    The Binding syntax, {Binding /}, works in WPF but does not work at all in Silverlight 3: <ContentControl Content="{Binding MyCollection}"> <ContentControl.ContentTemplate> <DataTemplate> <ContentControl Content="{Binding /}" /> </DataTemplate> </ContentControl.ContentTemplate> </ContentControl> What's the way to approach this in Silverlight?

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  • ScaleTransform and Image size

    - by Vinjamuri
    I have a Canvas which has an image as background. When I do the ScaleTransform to increase the size of the image, the image blows out of the Canvas. Although I increase the size, I don't want the image to go out of the Canvas, I just want it to fit inside the Canvas. How to fix this issue in WPF?

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  • casing the object values

    - by deep
    Hai am using telerik wpf grid in grid selection change event am getting the selected row values. the problem is the values are as object. object myData = radGridView.SelectedItem; the object myData contains the row values. but i don know how to get values from the myData object

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  • Bind command to X-button of window title bar

    - by LukePet
    My WPF maintenance window have a toolbar with a button "Exit"; a CommandExit is bind with this button. The CommandExit perform some checks before exit. Now, if I click to close button of the window (x-button of title bar), this checks are ignored. How can I do to bind CommandExit to window x-button?

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  • Element host loading time issue with winforms

    - by Vinjamuri
    I have an element host with 3 WPF controls. I am placing the element host on a winform. When my application is coming up, the element host is taking few seconds and the winform is getting displayed as a blank screen. How to fix this? Any ideas are appreciated. Basically, I don't want to display the blank screen as it looks ugly when the application is coming up.

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  • Possible to use Bindings only for the SourceChanged event?

    - by Schneider
    Basically I want to use the WPF Binding framework to "observe" a property in the data context, and when that value changes to call an event handler. I do not actually want to bind it to any target. Sounds simple but from what I can see Binding is too coupled (to the visual tree and various other bits) to be able to use it flexibly. Any thoughts?

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  • Paste Functionality for WPF DataGrid with DataGridTemplateColumns

    - by zmang
    Hi. I recently started using the WPF Datagrid with DataGridTemplateColumns containing the WPF AutoCompleteBox, but I'm finding trouble in implementing Clipboard.Paste functionality for these DataGridTemplateColumns. I've managed to get Clipboard.Paste working with built-in DataGridColumns via Vishal's guide here, but it doesn't work with DataGridTemplateColumns. Delving into the OnPastingCellClipboardContent method in the DataGridColumn class, it appears that fe.GetBindingExpression(CellValueProperty) is returning null rather than the required BindingExpression. Can anyone point me to the right direction? public virtual void OnPastingCellClipboardContent(object item, object cellContent) { BindingBase binding = ClipboardContentBinding; if (binding != null) { // Raise the event to give a chance for external listeners to modify the cell content // before it gets stored into the cell if (PastingCellClipboardContent != null) { DataGridCellClipboardEventArgs args = new DataGridCellClipboardEventArgs(item, this, cellContent); PastingCellClipboardContent(this, args); cellContent = args.Content; } // Event handlers can cancel Paste of a cell by setting its content to null if (cellContent != null) { FrameworkElement fe = new FrameworkElement(); fe.DataContext = item; fe.SetBinding(CellValueProperty, binding); fe.SetValue(CellValueProperty, cellContent); BindingExpression be = fe.GetBindingExpression(CellValueProperty); be.UpdateSource(); } } Thanks!

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  • WPF - LayoutUpdated event firing repeatedly

    - by Drew Noakes
    I've been adding a bit of animation to my WPF application. Thanks to Dan Crevier's unique solution to animating the children of a panel combined with the awesome WPF Penner animations it turned out to be fairly straightforward to make one of my controls look great and have its children move about with some nice animation. Unfortunately this all comes with a performance overhead. I'm happy to have the performance hit when items are added/removed or the control is resized, but it seems that this perf hit occurs consistently throughout the application's lifetime, even when items are completely static. The PanelLayoutAnimator class uses an attached property to hook the UIElement.LayoutUpdated.aspx) event. When this event fires, render transforms are animated to cause the children to glide to their new positions. Unfortunately it seems that the LayoutUpdated event fires every second or so, even when nothing is happening in the application (at least I don't think my code's doing anything -- the app doesn't have focus and the mouse is steady.) As the reason for the event is not immediately apparent to the event handler, all children of the control have to be reevaluated. This event is being called about once a second when idle. The frequency increases when actually using the app. So my question is, how can I improve the performance here? Any answer that assists would be appreciated, but I'm currently stuck on these sub-questions: What causes the LayoutUpdated event to fire so frequently? Is this supposed to happen, and if not, how can I find out why it's firing and curtail it? Is there a more convenient way within the handler to know whether something has happened that might have moved children? If so, I could bail out early and avoid the overhead of looping each child. For now I will work around this issue by disabling animation when there are more than N children in the panel.

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  • WPF application with MS Access database as a data source

    - by Kay Zed
    I have a Microsoft Access 2010 database. Now, using Visual Studio 2010, I want to create a WPF application and add the database as a data source. The app will have a window with a frame that provides navigation through pages. No problem so far. But: -What is the right way to set up the database in this scenario? Tables only? Or must everything go via queries? (VS2010 talks about views which I assume (?) are queries) -Database data must be updatable and records can be added. Some relationships go through link tables (many-to-many) and there are nullable foreign key relationships. Must I take manual steps to make it work? -While adding the data source VS2010 created an xsd from my Access database. I think the xsd might need further tweaking for the application to work the right way. What if I change my Access database design, I'd have to regenerate the xsd again as well. Is this right, and is it the way it is usually done? OR, should I let the original Access database go and give the application the capability to create new empty databases? -How do you provide controls in a page to step through the records in a table? Is there a special database control? -What is the way (WPF class?) to load records into the data context that displays in a page? (At this level it probably does not matter what type of data source it is.)

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