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  • MVVM- View Model-View Model Communications

    - by user275561
    How do I go about having two view models communicate with one another using MVVM Light. I know how to use the messenger class and register etc.. Here is my Scenario A Settings View ---> a Settings View Model . . . A MainPage View ---> A MainPage ViewModel If something changes in the Settings View it will Message back to the Settings View Model. So then I want the Settings View Model to communicate to the MainPage View Model about what changed. THe MainPage ViewModel will then tell the View.

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  • Can I have two different Styles in a CustomControl

    - by Subhen
    Hi, Can we have two different styles in generic.xaml setter template Property Something like: <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="local:customLocalFolderButton"> **<----Style 1---->** </ControlTemplate TargetType="local:customLocalFolderButton"> </Setter.Value> <Setter.Value> <ControlTemplate TargetType="local:customLocalFolderButton"> **<----Style 2---->** </ControlTemplate TargetType="local:customLocalFolderButton"> </Setter.Value> </Setter> Now I want to load the styles , as per the requirement. The 1st Style Can have a Red Folder and the Second Style Can have Blue Folder . The user can choose any of the theme and the choosen style(Either RedFolder or Blue) should be applied in the customControl it self. Thanks, Subhen

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  • Returning objects from another thread?

    - by Mark
    Trying to follow the hints laid out here, but she doesn't mention how to handle it when your collection needs to return a value, like so: private delegate TValue DequeueHandler(); public virtual TValue Dequeue() { if (dispatcher.CheckAccess()) { --count; var pair = dict.First(); var queue = pair.Value; var val = queue.Dequeue(); if (queue.Count == 0) dict.Remove(pair.Key); OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Remove, val)); return val; } else { dispatcher.BeginInvoke(new DequeueHandler(Dequeue)); } } This obviously won't work, because dispatcher.BeginInvoke doesn't return anything. What am I supposed to do? Or maybe I could replace dequeue with two functions, Peek and Pop, where Peek doesn't really need to be on the UI thread because it doesn't modify anything, right? As a side question, these methods don't need to be "locked" either, do they? If they're all forced to run in the UI thread, then there shouldn't be any concurrency issues, right?

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  • Creating static resource dictionary

    - by Vishal
    Hi All, I've created a Resource Dictionary that I want to merge with multiple usercontrol xaml files. I want only one instance of this Resource Dictionary to be created. Any idea how to do this? Note: Merge should happen through xaml only and not through code. Thanks & Regards, Vishal

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  • Why doesn't this data binding work?

    - by Qwertie
    I have a ViewModel class that contains a list of points, and I am trying to bind it to a Polyline. The Polyline picks up the initial list of points, but does not notice when additional points are added even though I implement INotifyPropertyChanged. What's wrong? <StackPanel> <Button Click="Button_Click">Add!</Button> <Polyline x:Name="_line" Points="{Binding Pts}" Stroke="Black" StrokeThickness="5"/> </StackPanel> C# side: // code-behind _line.DataContext = new ViewModel(); private void Button_Click(object sender, RoutedEventArgs e) { // The problem is here: NOTHING HAPPENS ON-SCREEN! ((ViewModel)_line.DataContext).AddPoint(); } // ViewModel class public class ViewModel : INotifyPropertyChanged { public event PropertyChangedEventHandler PropertyChanged; public PointCollection Pts { get; set; } public ViewModel() { Pts = new PointCollection(); Pts.Add(new Point(1, 1)); Pts.Add(new Point(11, 11)); } public void AddPoint() { Pts.Add(new Point(25, 13)); if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs("Pts")); } }

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  • How to give the condition for EventTrigger?

    - by Prabu
    Is it possible to give the condition within the EventTrigger?? I have written a following EventTrigger (Mouse.MouseLeave) for Radio button. I want this should not be trigged for an item which is in Checked condition (IsChecked=True). <EventTrigger RoutedEvent="Mouse.MouseLeave" SourceName="border"> <BeginStoryboard Name="out_BeginStoryboard" Storyboard="{StaticResource out}" /> <RemoveStoryboard BeginStoryboardName="over_BeginStoryboard" /> </EventTrigger> Please let me know how can I achieve this? Thanks in advance.

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  • How can I use a PathGeometry as a mask for a BitmapSource (or any image data)?

    - by Jedidja
    Assuming I have a BitmapSource (actually I have access to the raw pixels as well if necessary), how can I use a PathGeometry as a mask to cut out certain parts of the image? 01234567890123456789 0 -------------------- 1 | + + | 2 | * | 3 | * ) | 4 | * | 5 | ( | 6 -------------------- Assuming I have a PathGeometry that describes a rectangle that goes from (0, 0) to (8, 3), I would like to be able to get one of the following two images: 01234567890123456789 0 -------------------- 1 | + | 2 | * | 3 | | 4 | | 5 | | 6 -------------------- or 012345678 0 --------- 1 | + | 2 | *| 3 ---------

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  • How to bind the Command property of the ItemTemplate CheckBox to ViewModel object's property?

    - by 123Developer
    Let me ask this question with a pseudo code: Where "Contacts" the ViewModel object set as the DataContext for the window. "Contacts" has "PersonCollection" , public ICommand PersonSelectedCommand properties. "PersonCollection" is List "Person" has Name, Age properties Currently this is not working as CheckBox is trying to find and bind the ICommand "PersonSelectedCommand" property of object "person", which does not exists! How will bind the CheckBox to the ICommand "PersonSelectedCommand" property of object "Contact" Thanks and regards 123Deveopler

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  • Python CLI tool - general parsing question

    - by WinkyWolly
    If possible I would like to use the following structure for a command however I can't seem to figure out how to achieve this in Python: ./somescript.py arg <optional argument> -- "some long argument" Would it be possible to achieve this in a feasible manner without too much dirty code? Or should I just reconsider the syntax (which is primarily preference). Thanks!

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  • Adding events to ScatterViewItems when implicitly creating them

    - by James Hay
    Not sure there's too many surface developers on here but hey ho... If i have a scatterview which implicity creates the ScatterViewItem objects (see below), is it possible to retireve the contact events for each scatterViewItem? Also when i wrap tyhe image object in a ScatterViewItem explicitly the item no longer works. Could anyone advise as to why this is the case? <s:ScatterView ItemsSource="{StaticResource DummyData}" > <s:ScatterView.ItemTemplate> <DataTemplate> <Image Source="{Binding Path=ImagePath}" /> </DataTemplate> </s:ScatterView.ItemTemplate> </s:ScatterView>

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  • Problem adding Viewport2DVisual3D from Code

    - by Jeff
    I'm trying to add a Viewport2DVisual3D to a Viewport3D in code, but the visual isn't showing up. Any help understanding why not would be appreciated. The following is the code for the main window. Is it sufficient to just add the Viewport2DVisual3D to the children of the Viewport3D in order for it to be rendered? public partial class Window1 : System.Windows.Window { public Window1() { InitializeComponent(); this.Loaded += new RoutedEventHandler(temp); } public void temp(object sender, RoutedEventArgs e) { Viewport2DVisual3D test = new Viewport2DVisual3D(); MeshGeometry3D testGeometry = new MeshGeometry3D(); Vector3D CameraLookDirection = Main_Target_CameraOR20.LookDirection; // Calculate the Positions based on the Camera Point3DCollection myPoint3DCollection = new Point3DCollection(); myPoint3DCollection.Add(new Point3D(-1, 1, 0)); myPoint3DCollection.Add(new Point3D(-1, -1, 0)); myPoint3DCollection.Add(new Point3D(1, -1, 0)); myPoint3DCollection.Add(new Point3D(1, 1, 0)); testGeometry.Positions = myPoint3DCollection; PointCollection myPointCollection = new PointCollection(); myPointCollection.Add(new Point(0, 0)); myPointCollection.Add(new Point(0, 1)); myPointCollection.Add(new Point(1, 1)); myPointCollection.Add(new Point(1, 0)); testGeometry.TextureCoordinates = myPointCollection; Int32Collection triangleIndicesCollection = new Int32Collection(); triangleIndicesCollection.Add(0); triangleIndicesCollection.Add(1); triangleIndicesCollection.Add(2); triangleIndicesCollection.Add(2); triangleIndicesCollection.Add(3); triangleIndicesCollection.Add(0); testGeometry.TriangleIndices = triangleIndicesCollection; DiffuseMaterial myDiffuseMaterial = new DiffuseMaterial(Brushes.White); Viewport2DVisual3D.SetIsVisualHostMaterial(myDiffuseMaterial, true); Transform3DGroup myTransform3DGroup = new Transform3DGroup(); ScaleTransform3D myScaleTransform3D = new ScaleTransform3D(); myScaleTransform3D.ScaleX = 2; myScaleTransform3D.ScaleY = 2; myScaleTransform3D.ScaleZ = 2; TranslateTransform3D myTranslateTransform3D = new TranslateTransform3D(); myTranslateTransform3D.OffsetX = -27; myTranslateTransform3D.OffsetY = 13; myTranslateTransform3D.OffsetZ = 6; RotateTransform3D rotateTransform = new RotateTransform3D() { Rotation = new AxisAngleRotation3D { Angle = -50, Axis = new Vector3D(0, 1, 0) } }; myTransform3DGroup.Children.Add(myTranslateTransform3D); myTransform3DGroup.Children.Add(myScaleTransform3D); myTransform3DGroup.Children.Add(rotateTransform); test.Transform = myTransform3DGroup; Button myButton = new Button(); myButton.Content = "Test Button"; test.Material = myDiffuseMaterial; test.Geometry = testGeometry; test.Visual = myButton; ZAM3DViewport3D.Children.Add(test); } }

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  • Why is generated XAML spitting out namespaces that are not asked for?

    - by Matt Holmes
    I have a very simple XAML form, that has one namespace definition. For some reason, when Visual Studio processes that XAML file in to it's component .g.cs, it's sticking a bunch of namespace definitions at the top that I have not asked for in the XAML, or the code behind, and they are namespaces that no longer exist in my project. Thus the project is failing to compile. Why is Visual Studio sticking arbitrary namespace 'using' statements in my generated XAML .g.cs files? It's caused my entire project to break. Not one time did this .xaml file ever reference the namespaces in question, so it's doubly annoying.

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  • ValueConverter not being invoked in DataTemplate binding

    - by unforgiven3
    I have a ComboBox that uses a DataTemplate. The DataTemplate contains a binding which uses an IValueConverter to convert an enumerated value into a string. The problem is that the value converter is never invoked. This is my XAML: <ComboBox ItemsSource="{Binding Path=StatusChoices, Mode=OneWay}"> <ComboBox.ItemTemplate> <DataTemplate> <TextBlock Text="{Binding Converter={StaticResource StatusToTextConverter}}"/> </DataTemplate> </ComboBox.ItemTemplate> </ComboBox> Is my binding not correct? I thought this is how one implicitly binds to the value a DataTemplate is presenting. Am I wrong?

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  • RectangleGeometry with relative dimensions... how?

    - by Padu Merloti
    I'm trying to replicate the nowadays so fashionable "reflex" effect on a controltemplate for buttons I'm creating. The basic idea is to create a rectangle with a gradient fill from white to transparent and then clip some of that semi-transparent rectangle with a rectanglegeometry. The problem is that I don't know how to define a relative rectangle geometry. I kind of worked around width by defining a large value (1000), but height is a problem. For example, it works good for buttons that have a 200 height, but doesn't do anything for smaller buttons. Any ideas? <Rectangle RadiusX="5" RadiusY="5" StrokeThickness="1" Stroke="Transparent"> <Rectangle.Fill> <LinearGradientBrush StartPoint="0,0" EndPoint="0,0.55"> <GradientStop Color="#66ffffff" Offset="0.0" /> <GradientStop Color="Transparent" Offset="1.0" /> </LinearGradientBrush> </Rectangle.Fill> <Rectangle.Clip> <RectangleGeometry Rect="0,0,1000,60" /> </Rectangle.Clip> </Rectangle>

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  • datagrid column custom check mark

    - by Berryl
    I want a read only column bound to a boolean that shows a check mark image when true and nothing when false. The problem is the false value; I just want to show whatever the background of the datagrid is, but I don't see how to clear the image source. What should the Value of the image source be to do this? Cheers, Berryl <DataGridTemplateColumn.CellTemplate> <DataTemplate> <Image Name="imgChecked" Source="\Img_Checkmark" /> <DataTemplate.Triggers> <DataTrigger Binding="{Binding IsPrimary}" Value="False"> <Setter TargetName="imgChecked" Property="Source" Value=""/> *** ??? *** </DataTrigger> </DataTemplate.Triggers> </DataTemplate> </DataGridTemplateColumn.CellTemplate>

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  • Get the Grid data in ColumnHeaderClick

    - by plotnick
    Sorrry guys, I'm stuck here. I have a few grids, I also have CollectionViewSource objects associated with those grids. Now, I'm trying to apply CollectionViewSource.SortDescriptions in ColumnHeaderClick method, and now I have to define almost the same method for each grid. But the only thing I really need is to obtain in which Grid is happenning. How to get that, I have no idea. Help me please. VisualTreeHelper.GetParent didn't work.

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  • Configuring TeamCity + NUnit unit tests so files can be loaded properly

    - by Dave
    In a nutshell, I have a solution that builds fine in the IDE, and the unit tests all run fine with the NUnit GUI (via the NUnitit VS2008 plugin). However, when I execute my TeamCity build runner, all unit tests that require file access (e.g. for running tests against specific XML files), I just get System.IO.DirectoryNotFoundExceptions. The reason for this is clear: it's looking for those supporting XML files loaded by various unit tests in the wrong folder. The way my unit tests are structured looks like this: +-- project folder +-- unit tests folder +-- test.xml +-- test.cs +-- project file.xaml +-- project file.xaml.cs All of my projects own their own UnitTests folder, which contains the .cs file and any XML files, XML Schemas, etc that are necessary to run the tests. So when I write my test.cs, I have it look for "test.xml" in the code because they are in the same folder (actually, I do something like ....\unit tests\test.xml, but that's kind of silly). As I said before, the tests run great in NUnit. But that's because the unit tests are part of the project. When running the unit tests from TeamCity, I am executing them against the assemblies that get copied to the main app's output folder. These unit test XML files should not be copied willy-nilly to the output folder just to make the tests pass. Can anyone suggest a better method of organizing my unit tests in each project (which are dependencies for the main app), such that I can execute the unit tests from NUnit and from the TeamCity build runner? The only other option I can come up with is to just put the testing XML data in code, rather than loading it from a file. I would rather not do this.

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  • Why is my namespace not recognized in Visual Studio / xaml

    - by msfanboy
    Hello, these are my 2 classes a Attachable Property SelectedItems: code is from here: http://stackoverflow.com/questions/1297643/sync-selecteditems-in-a-muliselect-listbox-with-a-collection-in-viewmodel The namespace TBM.Helper is for sure proper as it works for other classes too. The namespace reference is also in the xaml file: xmlns:Helper="clr_namespace:TBM.Helper" But <ListBox Helper:SelectedItems.Items="{Binding SelectedItems}" ... does not work because = The property 'SelectedItems.Items' does not exist in XML namespace 'clr_namespace:TBM.Helper'. The attachable property 'Items' was not found in type 'SelectedItems What do I have to change ? using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Windows.Controls; using System.Collections; using System.Windows; namespace TBM.Helper { public static class SelectedItems : DependencyObject { private static readonly DependencyProperty SelectedItemsBehaviorProperty = DependencyProperty.RegisterAttached( "SelectedItemsBehavior", typeof(SelectedItemsBehavior), typeof(ListBox), null); public static readonly DependencyProperty ItemsProperty = DependencyProperty.RegisterAttached( "Items", typeof(IList), typeof(SelectedItems), new PropertyMetadata(null, ItemsPropertyChanged)); public static void SetItems(ListBox listBox, IList list) { listBox.SetValue(ItemsProperty, list); } public static IList GetItems(ListBox listBox) { return listBox.GetValue(ItemsProperty) as IList; } private static void ItemsPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { var target = d as ListBox; if (target != null) { GetOrCreateBehavior(target, e.NewValue as IList); } } private static SelectedItemsBehavior GetOrCreateBehavior(ListBox target, IList list) { var behavior = target.GetValue(SelectedItemsBehaviorProperty) as SelectedItemsBehavior; if (behavior == null) { behavior = new SelectedItemsBehavior(target, list); target.SetValue(SelectedItemsBehaviorProperty, behavior); } return behavior; } } } using System.Windows; using System.Windows.Controls; using System.Collections; namespace TBM.Helper { public class SelectedItemsBehavior { private readonly ListBox _listBox; private readonly IList _boundList; public SelectedItemsBehavior(ListBox listBox, IList boundList) { _boundList = boundList; _listBox = listBox; SetSelectedItems(); _listBox.SelectionChanged += OnSelectionChanged; _listBox.DataContextChanged += OnDataContextChanged; } private void SetSelectedItems() { _listBox.SelectedItems.Clear(); foreach (object item in _boundList) { // References in _boundList might not be the same as in _listBox.Items int i = _listBox.Items.IndexOf(item); if (i >= 0) _listBox.SelectedItems.Add(_listBox.Items[i]); } } private void OnDataContextChanged(object sender, DependencyPropertyChangedEventArgs e) { SetSelectedItems(); } private void OnSelectionChanged(object sender, SelectionChangedEventArgs e) { _boundList.Clear(); foreach (var item in _listBox.SelectedItems) _boundList.Add(item); } } }

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  • Method works on Emulator but no on Microsoft Surface unit?

    - by Roflcoptr
    I have the following code. The StartRecord method trows an error on the Microsoft Surface Unit. But when I'm testing it on the emulator, it all works great. Any hints how 1) to find the exception that is thrown on the Microsoft Surface Unit? 2) to find the error in the code? any assumptions? private void StartRecord(object sender, ContactEventArgs e) { isRecording = true; StartButton.IsEnabled = false; recordTimer = new Timer(10); recordTimer.Elapsed += new ElapsedEventHandler(recordTimer_Elapsed); PlaybackRoot.Visibility = System.Windows.Visibility.Collapsed; EllapsedRecord.Visibility = System.Windows.Visibility.Visible; InputLevel.Visibility = System.Windows.Visibility.Visible; long time = DateTime.Now.Ticks; String fileName = Convert.ToString(time) + ".wav"; Console.WriteLine(fileName); startTime = DateTime.UtcNow; recordTimer.Start(); record = new AudioRecording(fileName); record.getSampleAggregator().MaximumCalculated += new EventHandler<MaxSampleEventArgs>(AudioControl_MaximumCalculated); record.start(); }

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  • Auto RowDefinitions Grid with ContentControls

    - by pipelinecache
    Hi all, I have a Page with two ContentControls loaded by a RegionManager. A List of items, and a DetailView of these items. The problem is that the grid doesn't apply the auto height what I liked to. So I want to make all the available screen size to grid.row=0. I've added my code below: <Grid> <Grid.RowDefinitions> <RowDefinition MinHeight="300" Height="Auto" /> <RowDefinition Height="200"/> </Grid.RowDefinitions> <ContentControl Grid.Row="0" x:Name="ListRegion" ListMededelingRegion}" IsTabStop="False" Focusable="False" Height="Auto" /> <ContentControl VerticalAlignment="Bottom" Grid.Row="1" x:Name="DetailRegion" cal:RegionManager.RegionName="{x:Static com:RegionNames.DetailRegion}" IsTabStop="False" Focusable="False" /> </Grid>

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  • Is there a declarative way to force a set of Buttons to be the same size?

    - by Jekke
    I'm writing a form in XAML that has multiple buttons with content of different sizes (ie "OK" and "Save As...") Ideally, I'd like them all to be the smallest size possible to hold the largest content. In the example above, both buttons would be the width necessary to hold "Save As..." plus the margins and padding. If they were Grid cells, I could use a SizeGroup. Is there a similar declaration for Buttons?

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  • KeyPressed Event

    - by Asim Sajjad
    My Problem is that I want to check if the Arrow up or down key is press then I want to increment or decrement value in the textbox control. I have registered keyup event but I have to release the arrow up key in order to change the value, What I want is if User pressed up arrow key then it will increment the value until user release up arrow key and same for the down arrow key. Any idea?

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  • Refreshing Read-Only (Chained) Property in MVVM

    - by Wonko the Sane
    I'm thinking this should be easy, but I can't seem to figure this out. Take these properties from an example ViewModel (ObservableViewModel implements INotifyPropertyChanged): class NameViewModel : ObservableViewModel { Boolean mShowFullName = false; string mFirstName = "Wonko"; string mLastName = "DeSane"; private readonly DelegateCommand mToggleName; public NameViewModel() { mToggleName = new DelegateCommand(() => ShowFullName = !mShowFullName); } public ICommand ToggleNameCommand { get { return mToggleName; } } public Boolean ShowFullName { get { return mShowFullName; } set { SetPropertyValue("ShowFullName", ref mShowFullName, value); } } public string Name { get { return (mShowFullName ? this.FullName : this.Initials); } } public string FullName { get { return mFirstName + " " + mLastName; } } public string Initials { get { return mFirstName.Substring(0, 1) + "." + mLastName.Substring(0, 1) + "."; } } } The guts of such a [insert your adjective here] View using this ViewModel might look like: <TextBlock x:Name="txtName" Grid.Row="0" Text="{Binding Name}" /> <Button x:Name="btnToggleName" Command="{Binding ToggleNameCommand}" Content="Toggle Name" Grid.Row="1" /> The problem I am seeing is when the ToggleNameCommand is fired. The ShowFullName property is properly updated by the command, but the Name binding is never updated in the View. What am I missing? How can I force the binding to update? Do I need to implement the Name properties as DependencyProperties (and therefore derive from DependencyObject)? Seems a little heavyweight to me, and I'm hoping for a simpler solution. Thanks, wTs

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