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  • MVVM/WPF: Button is not disabled although the CanExecute says return value is FALSE ??

    - by msfanboy
    Hello, I have a detach and attach button with Command="..." bound to my ViewModel. Although I have only 1 selected pupil but have NOT selected a subject the detach button is not disabled, the attach button is ??? public RelayCommand AttachdSubjecstCommand { get { return _attachSubjectsCommand ?? (_attachSubjectsCommand = new RelayCommand(() => AttachSubjects(), () => CanAttachSubjects)); } } public RelayCommand DetachSubjectsCommand { get { return _detachSubjectsCommand ?? (_detachSubjectsCommand = new RelayCommand(() => DetachSubjects(), () => CanDetachSubjects)); } }

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  • In WPF how to define a Data template in case of enum?

    - by Ashish Ashu
    I have a Enum defined as Type public Enum Type { OneType, TwoType, ThreeType }; Now I bind Type to a drop down Ribbon Control Drop Down Menu in a Ribbon Control that displays each menu with a MenuName with corresponding Image. ( I am using Syncfusion Ribbon Control ). I want that each enum type like ( OneType ) has data template defined that has Name of the menu and corrospending image. How can I define the data template of enum ? Please suggest me the solution, if this is possible !! Please also tell me if its not possible or I am thinking in the wrong direction !!

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  • (VB.NET + WPF) Drag + Drop (to allow user sorting) of stackpanel elements within a Scrollviewer?

    - by Matt H.
    I have good model (I think!) for how to allow a user to drag an element in a stackpanel and reposition it to another location within the stackpanel. However, my Stackpanel is placed within a ScrollViewer, like this (generalized): <ScrollViewer> <StackPanel> ....First item ....Second item ....Third item ....Etc. </StackPanel> <ScrollViewer> Here is the problem, I wish to simulate the functionality of programs like word, where if I am dragging selected content (or an object) outside the viewable area, the window will scroll in the direction of the mouse to see more places to drop my nifty little object. ...i.e. If I move the mouse to the top of my ScrollViewer while dragging a stackpanel's contents, I want the scrollviewer to slowly move up so I can see more locations to drop my content. Any suggestions? If you can help me solve this, you will be a godsend!

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  • [WPF] selected item in listbox unreadable because of the color !

    - by Anna
    I dynamically create a collection of stackpanels in my listbox. In this stackpanel are contained labels and checkbox horizontally aligned. The problem is when I click on a stackpanel, the selection is unreadable because the line become dark-blue whereas the letters stay black so black on blue, you see nothing... how can I dynamically change the forecolor of the selected elements in the stackpanel ? I say dynamically and not in the xml file, because all those elements are dynamically created, base on a database... thanksssss!!

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  • WPF : how can i use a picture while i'm showing it?

    - by Roy Gavrielov
    hello, i'm trying to do so but the program throws this exception : An unhandled exception of type 'System.IO.IOException' occurred in mscorlib.dll Additional information: The process cannot access the file 'C:\Users\Roy\documents\visual studio 2010\Projects\Assignment3\Assignment3\bin\Debug\Images\Chrysanthemum.jpg' because it is being used by another process. is there a way to use it while it's open? code : if (imgAddMessage.Source != null) { BitmapImage src = (BitmapImage)imgAddMessage.Source; if (!Directory.Exists("Images")) { Directory.CreateDirectory("Images"); } FileStream stream = new FileStream("Images/" + imageName, FileMode.Create, FileAccess.ReadWrite); JpegBitmapEncoder encoder = new JpegBitmapEncoder(); encoder.Frames.Add(BitmapFrame.Create(src)); encoder.Save(stream); stream.Close(); } thanks.

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  • How to draw a full ellipse in a StreamGeometry in WPF?

    - by romkyns
    The only method in a StreamGeometryContext that seems related to ellipses is the ArcTo method. Unfortunately it is heavily geared to joining lines rather than drawing ellipses. In particular, the position of the arc is determined by a starting and ending point. For a full ellipse the two coincide obviously, and the exact orientation becomes undefined. So far the best way of drawing an ellipse centered on 100,100 of size 10,10 that I found is like this: using (var ctx = geometry.Open()) { ctx.BeginFigure(new Point(100+5, 100), isFilled: true, isClosed: true); ctx.ArcTo( new Point(100 + 5*Math.Cos(0.01), 100 + 5*Math.Sin(0.01)), // need a small angle but large enough that the ellipse is positioned accurately new Size(10/2, 10/2), // docs say it should be 10,10 but in practice it appears that this should be half the desired width/height... 0, true, SweepDirection.Counterclockwise, true, true); } Which is pretty ugly, and also leaves a small "flat" area (although not visible at normal zoom levels). How else might I draw a full ellipse using StreamGeometryContext?

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  • WPF: How do I get a reference to a styled window control in code behind?

    - by Brad
    I have a window defined with a style: <Window x:Class="winBorderless" x:Name="winBorderless" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:Local="clr-namespace:WindowStyle" Style="{StaticResource Window_Cartesia}" WindowStartupLocation="CenterScreen" BorderThickness="1" BorderBrush="#FF9CAAC1" Margin="5" Title="[Document Title]"> and the style defined in an application level dictionary: <Style x:Key="Window_Cartesia" TargetType="{x:Type Window}"> <Setter Property="WindowStyle" Value="None"/> <Setter Property="AllowsTransparency" Value="True"/> <Setter Property="Background" Value="Transparent"/> <EventSetter Event="Loaded" Handler="Loaded"/> <EventSetter Event="PreviewKeyDown" Handler="Preview_KeyDown"/> <EventSetter Event="MouseMove" Handler="FullScreen_MouseMove"/> <Setter Property="Template"> In code behind I have a reference to the Window instance set: Win = DirectCast(sender, winBorderless) This allows access to the window properties as the EventSetters pass references to the various controls. However, it doesn't provide for access to the controls defined in the style through the window reference as they don't exist there. So, what is the best way to reference a control through code behind that is defined in the style. I'd prefer not to iterate the trees to find them but ya gotta do....

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  • WPF DataTemplates with VS2010 designer support + reusable - would you do it that way?

    - by Christian
    Ok, I am currently tidying up all my old stuff. I ran into the issue of "code only DataTemplates" - which are really a pain in the ass. You can't see anything, they are really hard to design, and I want to improve my project. So I had the idea to use the following solution. The main benefits are: You have designer support for your data template You can easily include example sample data The file naming is consistent and easy to remember The preview does not require an additional XAML wrapper (even with code only controls) I will try to explain and illustrate my solution using a few pictures. I am interested in feedback, especially if you can imagine a better way to do it. And, of course, if you see any maintenance or performance issues. Ok, lets start with a simple PreviewObject. I want to have some data in it, so I create a subclass which will automatically fill in some dummy data. Then I add a list to the control, and name this list. Afterwards I add a DataTemplate, this is the sole reason for the whole control (to be able to see and edit the DataTemplate in place): Now I use this control to get my DataTemplate, to use it in other places. To make this easier, I added some code in the code behind, see here: Now I want a control to show me a list of PreviewItems, so I created a "code-only" control which creates an instance of my service (or gets one using DI in real world) and fills its list box with it: To view the result of this work, I added this control inside the same named XAML, this is basically only to be able to see the final result: What I do not like in this solution: The need to create the last control in "code only". So I tried something different while writing this post. The following two screenshots illustrate the approach. I am creating an instance of the service inside the DataContext, and I am using bindings to supply the Itemssourc and the ItemTemplate. The reason for the strange "static property" is refactoring support. If I hardcode the path in the designer (e.g. using "Path = PreviewHistory") and I refactor the names (which happens quite often, early design phase) - I screw up my controls without realizing it. Does anyone has a better idea for this? I am using Resharper, btw. Thanks for any input, and sorry for the image overkill. Just easier to explain that way.. Chris

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  • How to implement Master-Detail with Multi-Selection in WPF?

    - by gehho
    Hi, I plan to create a typical Master-Detail scenario, i.e. a collection of items displayed in a ListView via DataBinding to an ICollectionView, and details about the selected item in a separate group of controls (TextBoxes, NumUpDowns...). No problem so far, actually I have already implemented a pretty similar scenario in an older project. However, it should be possible to select multiple items in the ListView and get the appropriate shared values displayed in the detail view. This means, if all selected items have the same value for a property, this value should be displayed in the detail view. If they do not share the same value, the corresponding control should provide some visual clue for the user indicating this, and no value should be displayed (or an "undefined" state in a CheckBox for example). Now, if the user edits the value, this change should be applied to all selected items. Further requirements are: MVVM compatibility (i.e. not too much code-behind) Extendability (new properties/types can be added later on) Does anyone have experience with such a scenario? Actually, I think this should be a very common scenario. However, I could not find any details on that topic anywhere. Thanks! gehho. PS: In the older project mentioned above, I had a solution using a subclass of the ViewModel which handles the special case of multi-selection. It checked all selected items for equality and returned the appropriate values. However, this approach had some drawbacks and somehow seemed like a hack because (besides other smelly things) it was necessary to break the synchronization between the ListView and the detail view and handle it manually.

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  • How to apply styles to all windows in WPF app?

    - by Brandon
    I have the following App.xaml file: <Application x:Class="MiniDeviceConfig.App" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" StartupUri="MiniDeviceConfig.xaml"> <Application.Resources> <ResourceDictionary> <ResourceDictionary.MergedDictionaries> <ResourceDictionary Source="Button.xaml"/> <ResourceDictionary Source="CheckBox.xaml"/> <ResourceDictionary Source="ComboBox.xaml"/> <ResourceDictionary Source="Common.xaml"/> <ResourceDictionary Source="GroupBox.xaml"/> <ResourceDictionary Source="Label.xaml"/> <ResourceDictionary Source="LinkButton.xaml"/> <ResourceDictionary Source="ListBox.xaml"/> <ResourceDictionary Source="ListView.xaml"/> <ResourceDictionary Source="RadioButton.xaml"/> <ResourceDictionary Source="Tooltip.xaml"/> <ResourceDictionary Source="Window.xaml"/> </ResourceDictionary.MergedDictionaries> </ResourceDictionary> </Application.Resources> In my application, my main window is MiniDeviceConfig.xaml (as seen above). In my Button.xaml file, I clearly set the button height to some obscene number. And, this size is reflected in my main window's buttons. However, some action on the main window triggers a modal window that has more buttons on it. I was expecting the same tall buttons but no such luck. How do I get the style to propagate into all windows in the application?

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  • How can I make a WPF combo box have the width of its widest element in XAML ?

    - by csuporj
    I know how to do it in code, but can this be done in XAML ? Window1.xaml: <Window x:Class="WpfApplication1.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Window1" Height="300" Width="300"> <Grid> <ComboBox Name="ComboBox1" HorizontalAlignment="Left" VerticalAlignment="Top"> <ComboBoxItem>ComboBoxItem1</ComboBoxItem> <ComboBoxItem>ComboBoxItem2</ComboBoxItem> </ComboBox> </Grid> </Window> Window1.xaml.cs: using System.Windows; using System.Windows.Controls; namespace WpfApplication1 { public partial class Window1 : Window { public Window1() { InitializeComponent(); double width = 0; foreach (ComboBoxItem item in ComboBox1.Items) { item.Measure(new Size( double.PositiveInfinity, double.PositiveInfinity)); if (item.DesiredSize.Width > width) width = item.DesiredSize.Width; } ComboBox1.Measure(new Size( double.PositiveInfinity, double.PositiveInfinity)); ComboBox1.Width = ComboBox1.DesiredSize.Width + width; } } }

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  • Where do I define dependency properties shared by the detail views in a master-detail MVVM WPF scena

    - by absence
    I can think of two ways to implement dependency properties that are shared between the detail views: Store them in the master view model and add data bindings to the detail view models when they are created, and bind to them in the detail view. Don't store them in the view models at all, and use FindAncestor to bind directly to properties of the master view instead. What are the pros and cons of each, and are there other/better options?

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  • WPF: Is ListBox or Panel responsible for mouse wheel navigation?

    - by HDW
    I have a custom ListBox which uses a custom Panel as ItemsHost. I want to have control over mouse wheel input, so that turning the wheel changes the single selected item. I believe that the best method to do so is to handle the OnPreviewMouseWheel event (although this is only have what I want since it doesn't provide horizontal wheel data). Now the big question: Is there a best practice where to handle OnPreviewMouseWheel? In ListBox (which by default doesn't have a clue about the arrangement of the Panel's child elements) or in Panel (which by default doesn't have a clue about the "IsSelected" property of it's child elements)?

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  • Why won't this hit test fire a second time? wpf

    - by csciguy
    All, I have a main window that contains two custom objects (AnimatedCharacter). These objects are nothing but images. These images might contain transparent portions. One of these objects slightly overlaps the other object. There is a listener attached to the main window and is as follows. private void Window_MouseLeftButtonUp_1(object sender, MouseButtonEventArgs e) { Point pt = e.GetPosition((UIElement)sender); //store off the mouse pt hitPointMouse = pt; //clear the result list hitResultsSubList.Clear(); EllipseGeometry m_egHitArea = new EllipseGeometry(pt, 1, 1); VisualTreeHelper.HitTest(sender as Visual, HitTestFilterFuncNew, new HitTestResultCallback(HitTestCallback), new GeometryHitTestParameters(m_egHitArea)); //Check all sub items you have now hit if (hitResultsSubList.Count > 0) { CheckSubHitItems(hitResultsSubList); } } The idea is to filter out only a select group of items (called AnimatedCharacters). The hittest and filters are as follows public HitTestResultBehavior HitTestCallback(HitTestResult htrResult) { IntersectionDetail idDetail = ((GeometryHitTestResult)htrResult).IntersectionDetail; switch (idDetail) { case IntersectionDetail.FullyContains: return HitTestResultBehavior.Continue; case IntersectionDetail.Intersects: return HitTestResultBehavior.Continue; case IntersectionDetail.FullyInside: return HitTestResultBehavior.Continue; default: return HitTestResultBehavior.Stop; } } public HitTestFilterBehavior HitTestFilterFuncNew(DependencyObject potentialHitTestTarget) { if (potentialHitTestTarget.GetType() == typeof(AnimatedCharacter)) { hitResultsSubList.Add(potentialHitTestTarget as AnimatedCharacter); } return HitTestFilterBehavior.Continue; } This returns me back a list (called hitResultsSubList) that I attempt to then process further. I want to take everything in the hitResultsSubList and run a hit test on it again. This time, the hit test will be checking alpha levels on the particular animatedCharacter object. private void CheckSubHitItems(List<DependencyObject> hitResultsSub) { for(int i = 0; i<hitResultsSub.Count; i++) { hitResultsList.Clear(); AnimatedCharacter ac = hitResultsSub[i] as AnimatedCharacter; try { //DEBUGGER SKIPS THIS NEXT LINE EVERY SINGLE TIME. VisualTreeHelper.HitTest(ac, null, new HitTestResultCallback(hitCallBack), new PointHitTestParameters(hitPointMouse)); } catch (Exception e) { System.Diagnostics.Debug.WriteLine(e.StackTrace); } if (hitResultsList.Count > 0) { //do something here } } } Here is my problem now. The hit test in the second function (CheckSubHitItems) never gets called. There are definitely items (DependencyObjects of the type AnimatedCharacter) in the hitResultSub, but no matter what, the second hit test will not fire. I can walk the for loop fine, but when that line is hit, I get the following console statement. Step into: Stepping over non-user code 'System.MulticastDelegate.CtorClosed' No exceptions are thrown. Any help is appreciated.

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  • How to enforce min-width/height of a control to be always visible in WPF?

    - by MartyIX
    Hello, I've got an application and I would like to know if there's a way how to keep the whole visual element always visible. I thought that minWidth/minHeight will do that but it only changes the minimal size of the element but it doesn't enforces that the whole visual element is visible. I think what I need is minWidth from WinForms where it works exactly as I need. Example: Setting minWidth and minHeight for Window works but if I set minWidth for a StackPanel in Window the window can be resized so that the minWidth of StackPanel is ignored (actually the StackPanel has the requested size but it's hidden). Thank you for any suggestion!

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  • WPF: How to connect to a sql ce 3.5 database with ADO.NET?

    - by EV
    Hi, I'm trying to write an application that has two DataGrids - the first one displays customers and the second one selected customer's records. I have generated the ADO.NET Entity Model and the connection property are set in App.config file. Now I want to populate the datagrids with the data from sql ce 3.5 database which does not support LINQ-TO-SQL. I used this code for the first datagrid in code behind: CompanyDBEntities db; private void Window_Loaded(object sender, RoutedEventArgs e) { db = new CompanyDBEntities(); ObjectQuery<Employees> departmentQuery = db.Employees; try { // lpgrid is the name of the first datagrid this.lpgrid.ItemsSource = departmentQuery; } catch (Exception ex) { MessageBox.Show(ex.Message); } However, the datagrid is empty although there are records in a database. It would also be better to use it in MVVM pattern but I'm not sure how does the ado.net and MVVM work together and if it is even possible to use them like that. Could anyone help? Thanks in advance.

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  • Hot to declare itemTemplate that has Itemsource as Enum Values in WPF?

    - by Ashish Ashu
    I have a enum let's say Enum MyEnum { FirstImage, SecondImage, ThirdImage, FourthImage }; I have binded this Enum to my combobox in XAML. While defining an combobox I have defined an ItemTemplate of combox to take Two UI element: TextBlock that show the enum value (Description) Image I have done this much in XAML. I am wondering where I can specify the Image corrosponding to each item of Enum. Is that possible through data trigger ? I really appreciate if anyone have the XAML for this scenario. Many Thanks in advance

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  • Close WPF PopUp when clicking on Window Title bar.

    - by Jobi Joy
    I can see that the PopUp dropdown of a combobox gets closed if we click anywhere else in the app. How do I give that feature to my own Popup. I dont want to give a PreviewMouseDown event handler for the RootWindow to solve this issue. Something at the level of my userControl containing this popup.

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  • Beginner WPF/XML question: How to get an <element> in an <element>?

    - by Niels
    I have a rather simple question. I'm trying to get information out of an XML file, and now I need to get the that's inside another This is my XML code: <author> <name>Random_name1 (Random Name)</name> <uri>http://thisisanrandomurl.com</uri> </author> I can get the info with this code: Name = item.Element(ns + "author").Value, But this gives me: "Random_name1 (Random Name) http://thisisanrandomurl.com" I only want the info inside the tags. Any ideas? Thanks a lot, - Niels

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