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  • How do I keep the shape of an UIELement while doing a Drag and Drop in WPF

    - by Kamikaze
    Hi all!I'll give an example of what I intend to do: I have 2 StackPanels one containing an Ellipse the other one containing nothing; I want to drag the Ellipse from one stack panel to the other . The actual drag & drop is already done and works fine. However I'd like to know how to keep that that Ellipse shape at the tip of my mouse cursor (I've been searching all day and couldn't find anything that helps ) Even an windows forms example would be nice , I'll be able to adapt it :). Thanks for the help!

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  • how to extend wpf combo box to bind data?

    - by Shaihan
    i need to bind a collection of objects to a combo box which i can use in different forms. so i want create a custom control which binds the collection to the combo box? how t do it by extending combo box? also how can i define the ItemData template?

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  • How do I implement a custom Brush in WPF?

    - by MojoFilter
    Where can I find out enough info about how Brushes work to implement my own System.Windows.Media.Brush? I can handle all of the freezable baggage, but it's not really obvious what I need to override to get it to work. Yeah, so I didn't mean that I want to use a predefined brush. I want to extend System.Windows.Media.Brush, which is an abstract class. This is all purely for my own edification. I'm not even sure what kind of brush I could make. I was just trying to learn how brushes work. As in: public AwesomeBrush : Brush { protected override Freezable CreateInstanceCore() { return new AwesomeBrush(); } ... // concrete brush stuff }

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  • Tool to generate a GUI (WinForms or WPF) from a class.

    - by Pat
    Say we've got a class like public class Doer { public int Timeout {get;set;} public string DoIt(string input) { string toReturn; // Do something that involves a Timeout return toReturn; } } Is there a tool that would create a Form or Control for prototyping this class? The GUI might have a NumericUpDown control with a label of "Timeout" and a GroupBox with a TextBox for "input" and a button labeled "DoIt" with an eventhandler that calls Doer.DoIt with the Text property of the input TextBox and puts the response in another TextBox.

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  • How to find out minimal render size of a visual in WPF?

    - by MartyIX
    Hello, I'm trying to display a game desk and info panel right next to the game desk and I need to calculate minimal width of the info panel in order to display the game desk properly. This is my XAML code: <StackPanel Orientation="Horizontal"> <Rectangle Width="Auto" Height="Auto" Name="gamedeskRect" Style="{DynamicResource GameDesk}" /> <StackPanel Name="infoPanel" Width="Auto" HorizontalAlignment="Right" Height="Auto" VerticalAlignment="Center" Margin="10,0,0,0"> <!-- a few textblocks in a grid here --> </StackPanel> </StackPanel> And the problem is that when I'm resizing the window a part of the right panel may be cropped which is what I don't want.

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  • In a WPF Application, What happens after my code in the main window constructor is executed?

    - by KyleGobel
    I'm wondering what happens after the constructor is done executing my code, because the constructor is taking like 10 seconds to run on a cold start up, but according to the profiler, my code is done executing in like 2 seconds. Also stepping through the code in the debugger, after the last line of my constructor, I sit there and wait for 7-8 seconds before the window appears. Why is this? If the window is loading content or something, why isn't it displayed on the screen, done loading or not after the constructor finishes it's job? What's the hold up? (or how do i figure that out)

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  • C# WPF: Combobox isn't jumping down the list as I type when I use a multiconvert on it.

    - by michael paul
    Basically, I have a combobox that is built by doing multibinding (multiconverter) for the memberdisplaypath. The problem is if the combobox is selected and I start typing, it doesn't jump down the list. Doesn't it go by what's displayed in the combobox for typing? That is, if the combobox is setup like so: //value/display (please disregard how weird the numbering is...) //ref - the value is built upon an observablecollection of a class. ref / "" ref / "10 - Very much agree." ref / "15 - Somewhat agree." ref / "19 - No weight." ref / "23 - Somwhat disagree." ref / "33 - Very much disagree." If the user presses the "1" key it should jump to "10 - Very much agree." But, instead it just sits there...

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  • How do I assign selected WPF datagrid row columns to variables. (VB.NET)

    - by Peter
    Hi, I have a datagrid with customer data such as ID, name, email, phone etc. When I select a row (with a button or selectionchanged) I want to store that row's columns in variables like dim email as string dim name as string email = dgCustomers.theselectedrow.theselectedcell name = dgCustomers.theselectedrow.theselectedcell If I have a datatable with only one row I know I can get column data with: dim email as string = CustomerDataTableInstance.rows(0).Item("Email") I don't know how to get the selected row number though when I have several rows and the user clicks one/uses the keyboard. The datagrid is bound to a datatable, not a class with object collections. Any help is appreciated!

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  • WPF: ContextMenu item bound to a Command is enabled only after invoking the command from another so

    - by Brad
    I have a ContextMenu whose items are all bound to commands and enable\disable correctly after ANY Command is invoked from another source but prior to, they are all disabled. So if I run the app, all the MenuItems are disabled but if I invoke any of the bound commands from another source (buttons, for instance) they become synchronized with the CanExecute code. I have no idea how to debug this. Any thought would be helpful!?!

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  • What causes a WPF ListCollectionView that uses custom sorting to re-sort its items?

    - by Drew Noakes
    Consider this code (type names genericised for the purposes of example): // Bound to ListBox.ItemsSource _items = new ObservableCollection<Item>(); // ...Items are added here ... // Specify custom IComparer for this collection view _itemsView = CollectionViewSource.GetDefaultView(_items) ((ListCollectionView)_itemsView).CustomSort = new ItemComparer(); When I set CustomSort, the collection is sorted as I expect. However I require the data to re-sort itself at runtime in response to the changing of the properties on Item. The Item class derives from INotifyPropertyChanged and I know that the property fires correctly as my data template updates the values on screen, only the sorting logic is not being called. I have also tried raising INotifyPropertyChanged.PropertyChanged passing an empty string, to see if a generic notification would cause the sorting to be initiated. No bananas. EDIT In response to Kent's suggestion I thought I'd point out that sorting the items using this has the same result, namely that the collection sorts once but does not re-sort as the data changes: _itemsView.SortDescriptions.Add( new SortDescription("PropertyName", ListSortDirection.Ascending));

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  • Should we use server generated XAML to deliver our Silverlight/WPF UIs?

    - by brownj
    Back in January 2009, Dino Esposito published an article on MSDN titled "Managing Dynamic Content Delivery In Silverlight". We are considering using an approach like this for an upcoming project and were wondering if anyone had any advice on whether this is a good approach. Are there any traps or pitfalls we should look out for? We currently use Prism and would need to look at how the two would live happily together.

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  • Center a TextBox over the top of a ScrollViewer in WPF.

    - by Eric
    I have a MainView that contains a navigation bar which selects one of many XAML pages to be displayed in the page view pane. The MainView contains a ScrollViewer around the pages. This allows the pages to be whatever size they need to be and the MainView's ScrollViewer scrolls them. This all works great. On one of the pages, I need to (sometimes) center a TextBox in the middle of the page view pane (over the top of the page content). This was easily done by placing both the page content and the TextBox overlapping each other in a Grid (and I hide the TextBox as necessary). This all seems to work great. However, if the page content grows to be larger than the pane, the TextBox is centered not on the pane, but on the full page content. Thus, it moves from center screen down and/or to the right (and eventually off the screen). Bummer. Options: Remove the ScrollViewer from the MainView. This would require placing one on every page! Argh. Do option #1, and create a ScrolledPage base class. This is a lot of work, and I'm worried about tools issues (Blend issues). It also requires changing every page (to subclass this page). Somehow override the ScrollViewer on just this page. Then, place another ScrollViewer on the page content to Scroll it. Option 3 seems preferable, because it contains the issue to just modifying this page (instead of changing the rest of the pages). However, I can't figure out how to do it. Ideas? Thanks in advance! Eric

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  • Suggested (simple) approach for drawing large numbers of visual elements in WPF?

    - by Ender
    I'm writing an interface that features a large (~50000px width) "canvas"-type area that is used to display a lot of data in a fairly novel way. This involves lots of lines, rectangles, and text. The user can scroll around to explore the entire canvas. At the moment I'm just using a standard Canvas panel with various Shapes placed on it. This is nice and easy to do: construct a shape, assign some coordinates, and attach it to the Canvas. Unfortunately, it's pretty slow (to construct the children, not to do the actual rendering). I've looked into some alternatives, it's a bit intimidating. I don't need anything fancy - just the ability to efficiently construct and place objects in a coordinate plane. If all I get are lines, colored rectangles, and text, I'll be happy. Do I need Geometry instances inside of Geometry Groups inside of GeometryDrawings inside of some Panel container? Note: I'd like to include text and graphics (i.e. colored rectangles) in the same space, if possible.

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  • How do you filter a view of a DataTable in .Net 3.5 sp1 using WPF c# and xaml?

    - by Tony
    I found the MSDN example code for getting the default view of a collection and adding a filter to the view, but most of it is for .Net 4.0. I'm on a team that is not currently switching to 4.0, so I don't have that option. None of the examples I found used a DataTable as the source, so I had to adapt it a little. I'm using a DataTable because the data is comming from a DB ans it's easy to populate. After trying to implement the MSDN examples, I get a "NotSupportedException" when I try to set the Filter. This is the c# code I have: protected DataTable _data = new DataTable(); protected BindingListCollectionView _filteredDataView; ... private void On_Loaded(Object sender, RoutedEventArgs e) { _filteredDataView = (BindingListCollectionView)CollectionViewSource.GetDefaultView(_data); _filteredDataView.Filter = new Predicate(MatchesCurrentSelections); // throws NotSupportedException } ... public bool MatchesCurrentSelections(object o){...} It seems that either BindingListCollectionView does not support filtering in .Net 3.5, or it just doesn't work for a DataTable. I looked at setting it up in XAML instead of the C# code, but the XAML examples use collections in resources instead of a collection that is a memberof the class, so I have no idea how to set that up. Does any one know how to filter a view to a DataTable?

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  • WPF: How can I KEEP the same ItemTemplate instance once its created ??

    - by Samir Sabri
    Hello, Here is a cinario: I have a ListView, with ItemsSource = ProjectModel.Instance.PagesModelsCollection; where PagesModelsCollection is an ObservableCollection In the ListView XAML part: <ListView.ItemTemplate> <DataTemplate x:Name="PagesViewDataTemplate"> <DataTemplate.Resources> <Style x:Key="PageHostStyle" TargetType="{x:Type p:KPage}"> </Style> </DataTemplate.Resources> <StackPanel x:Name="MarginStack" Margin="50,50,50,50" > <p:KPage x:Name="PageHost" > </p:KPage> </StackPanel> </DataTemplate> </ListView.ItemTemplate> The problem is the ITemTemplate is re-created each time we refresh the Items. So, if we have 100 Item in the list view, another 100 new ItemTemplate instance will be created if we refresh the items! As a result, if we add UIElements on one of the ItemTemplate intances, those added UIElements will be lost, because the old ITemTemplate is replaced with a new one! How can I KEEP the ItemTemplate instance once its created ??

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  • Configure ListBox in WPF so that I will be possible to select multiple items without holding CTRL ke

    - by drasto
    I have a Listbox that allows user to select multiple items. Normally user can do that by holding CTRL key and clicking the item he or she wants to select. Is it possible to configure this listbox so that the user will not have to hold the CTRL key when selecting items ? So that he or she will just click the item (without holding anything) and the item will be selected(diselected if it was selected previously) ? Thank you

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  • How to change the direction of wpf marquee dynamically?

    - by ashish semwal
    Hi all, I want to change the direction of my marquee on changeDirection button click. My code for changing direction is : private void changeDirection_click(object sender, RoutedEventArgs e) { if (_marqueeType == MarqueeType.RightToLeft) { _marqueeType = MarqueeType.LeftToRight; StartMarqueeing(_marqueeType); } else if (_marqueeType == MarqueeType.LeftToRight) { _marqueeType = MarqueeType.RightToLeft; StartMarqueeing(_marqueeType); } } And code for start marquee is : public void StartMarqueeing(MarqueeType marqueeType) { double height = canMain.ActualHeight - marqueeList.ActualHeight; marqueeList.Margin = new Thickness(0, 0, 0, 0); doubleAnimation.From = -marqueeList.ActualWidth; doubleAnimation.To = canMain.ActualWidth; doubleAnimation.RepeatBehavior = RepeatBehavior.Forever; doubleAnimation.Duration = new Duration(TimeSpan.FromSeconds(_marqueeTimeInSeconds)); if (marqueeType == MarqueeType.RightToLeft) { Storyboard.SetTargetProperty(doubleAnimation, new PropertyPath("(Canvas.Right)")); _storyBoard.Children.Add(doubleAnimation); _storyBoard.Begin(marqueeList, true); } else if (marqueeType == MarqueeType.LeftToRight) { Storyboard.SetTargetProperty(doubleAnimation, new PropertyPath("(Canvas.Left)")); _storyBoard.Children.Add(doubleAnimation); _storyBoard.Begin(marqueeList, true); } } Now here I am able to change the direction from Right to Left only first time. But when I am change it from Left to Right it’s not changing the marquee position Left to Right. Please help me on this...........its urgent!!!!!!!!!!!

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  • WPF create a list of controls that can be scrolled via the mouse but still remain functional

    - by Mark
    I have a list of controls that I am displaying via a WrapPanel and it horizontally oriented. I have implemented a "Click and Drag" scrolling technique so that the user scrolls with the mouse via clicking and dragging. Like so: <Canvas x:Name="ParentCanvas" PreviewMouseDown="Canvas_MouseDown" MouseMove="Canvas_MouseMove"> <WrapPanel> <WrapPanel.RenderTransform> <TranslateTransform /> </WrapPanel.RenderTransform> <!-- controls are all in here ... --> </WrapPanel> </Canvas> Then in the code behind: private Point _mousePosition; private Point _lastMousePosition; private void Canvas_MouseDown(object sender, MouseButtonEventArgs e) { _lastMousePosition = e.GetPosition(ParentCanvas); e.Handled = true; } private void Canvas_MouseMove(object sender, MouseEventArgs e) { _mousePosition = e.GetPosition(ParentCanvas); var delta = _mousePosition - _lastMousePosition; if(e.LeftButton == MouseButtonState.Pressed && delta.X != 0) { var transform = ((TranslateTransform)_wrapPanel.RenderTransform).Clone(); transform.X += delta.X; _wrapPanel.RenderTransform = transform; _lastMousePosition = _mousePosition; } } This all works fine But what I want to do is make it so that when a users clicks to drag, the items within the WrapPanel dont respond (i.e. the user is only browsing), but when the user clicks (as in a full click) then they do respond to the click. Just like how the iphone works, when you press and drag directly on an app, it does not open the app, but rather scrolls the screen, but when you tap the app, it starts... I hope this makes sense. Cheers, Mark

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