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• c# wpf command pattern

  - by evan

  I have a wpf gui which displays a list of information in separate window and in a separate thread from the main application. As the user performs actions in the main window the side window is updated. (For example if you clicked page down in the main window a listbox in the side window would page down). Right now the architecture for this application feels very messy and I'm sure there is a cleaner way to do it. It looks like this: Main Window contains a singleton SideWindowControl which communicates with an instance of the SideWindowDisplay using events - so, for example, the pagedown button would work like: 1) the event handler of the button on the main window calls SideWindowControl.PageDown() 2) in the PageDown() function a event is created and thrown. 3) finally the gui, ShowSideWindowDisplay is subscribing to the SideWindowControl.Actions event handles the event and actually scrolls the listbox down - note because it is in a different thread it has to do that by running the command via Dispatcher.Invoke() This just seems like a very messy way to this and there must be a clearer way (The only part that can't change is that the main window and the side window must be on different threads). Perhaps using WPF commands? I'd really appreciate any suggestions!! Thanks

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• displaying a WPF Window from a System.Configuration.Install.Installer class

  - by cbeuker

  Greetings all, I have a question. I have created a WPF application. So, I naturally created an installer (Visual Studio Install project) for it. In the Commit section of the installer I want to launch a WPF window which is my configuration wizard. So I created a Installer class, overrode the Commit method and put the following in method: Application theApp = new Application; theApp.Run (new MyWPFWizardWindow()); I keep getting the error: The calling thread must be STA, because many UI components require this. No problems, this makes as it is a GUI application. But I can't, for the life of me, get the installer to fire up my window. I have tried putting [STAThread] on the method. I have tried firing up a thread and setting the ApartmentState to STA. I am guessing it's something really simple that I am over looking. Anyone have any thoughts? Thanks in advance.. cmb..

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• Ensuring WPF window is on top all the time even when user clicks another maximised application

  - by mttumbledown

  Hi I am trying to ensure my WPF window stays on top as long as it is open. It is acting as a pop-up set to TopMost=true, and a call to the win32 SetWindowPos to TOPMOST. When first opened it appears on top of another running application on the desktop- maximized or not. If the user activates or uses a window in the application mine loses focus and disappears. I thought of manipulating the other application window, setting it to a lower z index. How do I find the application window? How do I iterate through all windows? (This question still stands, even if it is not the correct approach). I would be using SetWindowPos, GetForegroundWindow, GetForegroundWindow, GetDesktopWindow et cetera. I suspect that as soon as the user clicks in their application that it will still focus it regardless and I am barking up the wrong tree. At the moment, my application is a black box and I can’t handle it the other way, for example, periodically messaging my app to focus. I also thought of having a long running background thread which periodically focuses my WPF popup, but need to watch resources and processor. Kind regards,

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• What is the worst gotcha in WPF?

  - by David

  Hi, I've started to make myself a list of "WPF gotchas": things that bug me and that I had to write down to remember because I fall for them every time.... Now, I'm pretty sure you all stumbled upon similar situations at one point, and I would like you to share your experience on the subject: What is the gotcha that gets you all the time? the one you find the most annoying? (I have a few issues that seem to be without explanation, maybe your submissions will explain them) Here are a few of my "personnal" gotchas (randomly presented): For a MouseEvent to be fired even when the click is on the "transparent" background of a control (e.g. a label) and not just on the content (the Text in this case), the control's Background has to be set to "Brushes.Transparent" and not just "null" (default value for a label) A WPF DataGridCell's DataContext is the RowView to whom the cell belong, not the CellView When inside a ScrollViewer, a Scrollbar is managed by the scrollviewer itself (i.e. setting properties such as ScrollBar.Value is without effect) Key.F10 is not fired when you press "F10", instead you get Key.System and you have to go look for e.SystemKey to get the Key.F10 ... and now you're on.

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• Failing to use Array.Copy() in my WPF App

  - by Steven Wilson

  I am a C++ developer and recently started working on WPF. Well I am using Array.Copy() in my app and looks like I am not able to completely get the desired result. I had done in my C++ app as follows: static const signed char version[40] = { 'A', 'U', 'D', 'I', 'E', 'N', 'C', 'E', // name 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , // reserved, firmware size 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , // board number 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , // variant, version, serial 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 // date code, reserved }; unsigned char sendBuf[256] = {}; int memloc = 0; sendBuf[memloc++] = 0; sendBuf[memloc++] = 0; // fill in the audience header memcpy(sendBuf+memloc, version, 8); // the first 8 bytes memloc += 16; // the 8 copied, plus 8 reserved bytes I did the similar operation in my WPF (C#) app as follows: Byte[] sendBuf = new Byte[256]; char[] version = { 'A', 'U', 'D', 'I', 'E', 'N', 'C', 'E', // name '0', '0', '0', '0', '0', '0', '0', '0' , // reserved, firmware size '0', '0', '0', '0', '0', '0', '0', '0' , // board number '0', '0', '0', '0', '0', '0', '0', '0' , // variant, version, serial '0', '0', '0', '0', '0', '0', '0', '0' // date code, reserved }; // fill in the address to write to -- 0 sendBuf[memloc++] = 0; sendBuf[memloc++] = 0; // fill in the audience header Array.Copy(sendBuf + memloc, version, 8); // the first 8 bytes memloc += 16; But it throws me an error at Array.Copy(sendBuf + memloc, version, 8); as Operator '+' cannot be applied to operands of type 'byte[]' and 'int'. How can achieve this???? :) please help :)

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• WPF TreeView MouseDown

  - by imekon

  I've got something like this in a TreeView: <DataTemplate x:Key="myTemplate"> <StackPanel MouseDown="OnItemMouseDown"> ... </StackPanel> </DataTemplate> Using this I get the mouse down events if I click on items in the stack panel. However... there seems to be another item behind the stack panel that is the TreeViewItem - it's very hard to hit, but not impossible, and that's when the problems start to occur. I had a go at handling PreviewMouseDown on TreeViewItem, however that seems to require e.Handled = false otherwise standard tree view behaviour stops working. Ok, Here's the source code... MainWindow.xaml <Window x:Class="WPFMultiSelectTree.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="clr-namespace:WPFMultiSelectTree" Title="Multiple Selection Tree" Height="300" Width="300"> <Window.Resources> <!-- Declare the classes that convert bool to Visibility --> <local:VisibilityConverter x:Key="visibilityConverter"/> <local:VisibilityInverter x:Key="visibilityInverter"/> <!-- Set the style for any tree view item --> <Style TargetType="TreeViewItem"> <Style.Triggers> <DataTrigger Binding="{Binding Selected}" Value="True"> <Setter Property="Background" Value="DarkBlue"/> <Setter Property="Foreground" Value="White"/> </DataTrigger> </Style.Triggers> <EventSetter Event="PreviewMouseDown" Handler="OnTreePreviewMouseDown"/> </Style> <!-- Declare a hierarchical data template for the tree view items --> <HierarchicalDataTemplate x:Key="RecursiveTemplate" ItemsSource="{Binding Children}"> <StackPanel Margin="2" Orientation="Horizontal" MouseDown="OnTreeMouseDown"> <Ellipse Width="12" Height="12" Fill="Green"/> <TextBlock Margin="2" Text="{Binding Name}" Visibility="{Binding Editing, Converter={StaticResource visibilityInverter}}"/> <TextBox Margin="2" Text="{Binding Name}" KeyDown="OnTextBoxKeyDown" IsVisibleChanged="OnTextBoxIsVisibleChanged" Visibility="{Binding Editing, Converter={StaticResource visibilityConverter}}"/> <TextBlock Margin="2" Text="{Binding Index, StringFormat=({0})}"/> </StackPanel> </HierarchicalDataTemplate> <!-- Declare a simple template for a list box --> <DataTemplate x:Key="ListTemplate"> <TextBlock Text="{Binding Name}"/> </DataTemplate> </Window.Resources> <Grid> <!-- Declare the rows in this grid --> <Grid.RowDefinitions> <RowDefinition Height="Auto"/> <RowDefinition/> <RowDefinition Height="Auto"/> <RowDefinition/> </Grid.RowDefinitions> <!-- The first header --> <TextBlock Grid.Row="0" Margin="5" Background="PowderBlue">Multiple selection tree view</TextBlock> <!-- The tree view --> <TreeView Name="m_tree" Margin="2" Grid.Row="1" ItemsSource="{Binding Children}" ItemTemplate="{StaticResource RecursiveTemplate}"/> <!-- The second header --> <TextBlock Grid.Row="2" Margin="5" Background="PowderBlue">The currently selected items in the tree</TextBlock> <!-- The list box --> <ListBox Name="m_list" Margin="2" Grid.Row="3" ItemsSource="{Binding .}" ItemTemplate="{StaticResource ListTemplate}"/> </Grid> </Window> MainWindow.xaml.cs /// <summary> /// Interaction logic for MainWindow.xaml /// </summary> public partial class MainWindow : Window { private Container m_root; private Container m_first; private ObservableCollection<Container> m_selection; private string m_current; /// <summary> /// Constructor /// </summary> public MainWindow() { InitializeComponent(); m_selection = new ObservableCollection<Container>(); m_root = new Container("root"); for (int parents = 0; parents < 50; parents++) { Container parent = new Container(String.Format("parent{0}", parents + 1)); for (int children = 0; children < 1000; children++) { parent.Add(new Container(String.Format("child{0}", children + 1))); } m_root.Add(parent); } m_tree.DataContext = m_root; m_list.DataContext = m_selection; m_first = null; } /// <summary> /// Has the shift key been pressed? /// </summary> private bool ShiftPressed { get { return Keyboard.IsKeyDown(Key.LeftShift) || Keyboard.IsKeyDown(Key.RightShift); } } /// <summary> /// Has the control key been pressed? /// </summary> private bool CtrlPressed { get { return Keyboard.IsKeyDown(Key.LeftCtrl) || Keyboard.IsKeyDown(Key.RightCtrl); } } /// <summary> /// Clear down the selection list /// </summary> private void DeselectAndClear() { foreach(Container container in m_selection) { container.Selected = false; } m_selection.Clear(); } /// <summary> /// Add the container to the list (if not already present), /// mark as selected /// </summary> /// <param name="container"></param> private void AddToSelection(Container container) { if (container == null) { return; } foreach (Container child in m_selection) { if (child == container) { return; } } container.Selected = true; m_selection.Add(container); } /// <summary> /// Remove container from list, mark as not selected /// </summary> /// <param name="container"></param> private void RemoveFromSelection(Container container) { m_selection.Remove(container); container.Selected = false; } /// <summary> /// Process single click on a tree item /// /// Normally just select an item /// /// SHIFT-Click extends selection /// CTRL-Click toggles a selection /// </summary> /// <param name="sender"></param> private void OnTreeSingleClick(object sender) { FrameworkElement element = sender as FrameworkElement; if (element != null) { Container container = element.DataContext as Container; if (container != null) { if (CtrlPressed) { if (container.Selected) { RemoveFromSelection(container); } else { AddToSelection(container); } } else if (ShiftPressed) { if (container.Parent == m_first.Parent) { if (container.Index < m_first.Index) { Container item = container; for (int i = container.Index; i < m_first.Index; i++) { AddToSelection(item); item = item.Next; if (item == null) { break; } } } else if (container.Index > m_first.Index) { Container item = m_first; for (int i = m_first.Index; i <= container.Index; i++) { AddToSelection(item); item = item.Next; if (item == null) { break; } } } } } else { DeselectAndClear(); m_first = container; AddToSelection(container); } } } } /// <summary> /// Process double click on tree item /// </summary> /// <param name="sender"></param> private void OnTreeDoubleClick(object sender) { FrameworkElement element = sender as FrameworkElement; if (element != null) { Container container = element.DataContext as Container; if (container != null) { container.Editing = true; m_current = container.Name; } } } /// <summary> /// Clicked on the stack panel in the tree view /// /// Double left click: /// /// Switch to editing mode (flips visibility of textblock and textbox) /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void OnTreeMouseDown(object sender, MouseButtonEventArgs e) { Debug.WriteLine("StackPanel mouse down"); switch(e.ChangedButton) { case MouseButton.Left: switch (e.ClickCount) { case 2: OnTreeDoubleClick(sender); e.Handled = true; break; } break; } } /// <summary> /// Clicked on tree view item in tree /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void OnTreePreviewMouseDown(object sender, MouseButtonEventArgs e) { Debug.WriteLine("TreeViewItem preview mouse down"); switch (e.ChangedButton) { case MouseButton.Left: switch (e.ClickCount) { case 1: { // We've had a single click on a tree view item // Unfortunately this is the WHOLE tree item, including the +/- // symbol to the left. The tree doesn't do a selection, so we // have to filter this out... MouseDevice device = e.Device as MouseDevice; Debug.WriteLine(String.Format("Tree item clicked on: {0}", device.DirectlyOver.GetType().ToString())); // This is bad. The whole point of WPF is for the code // not to know what the UI has - yet here we are testing for // it as a workaround. Sigh... if (device.DirectlyOver.GetType() != typeof(Path)) { OnTreeSingleClick(sender); } // Cannot say handled - if we do it stops the tree working! //e.Handled = true; } break; } break; } } /// <summary> /// Key press in text box /// /// Return key finishes editing /// Escape key finishes editing, restores original value (this doesn't work!) /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void OnTextBoxKeyDown(object sender, KeyEventArgs e) { switch(e.Key) { case Key.Return: { TextBox box = sender as TextBox; if (box != null) { Container container = box.DataContext as Container; if (container != null) { container.Editing = false; e.Handled = true; } } } break; case Key.Escape: { TextBox box = sender as TextBox; if (box != null) { Container container = box.DataContext as Container; if (container != null) { container.Editing = false; container.Name = m_current; e.Handled = true; } } } break; } } /// <summary> /// When text box becomes visible, grab focus and select all text in it. /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void OnTextBoxIsVisibleChanged(object sender, DependencyPropertyChangedEventArgs e) { bool visible = (bool)e.NewValue; if (visible) { TextBox box = sender as TextBox; if (box != null) { box.Focus(); box.SelectAll(); } } } } Here's the Container class public class Container : INotifyPropertyChanged { private string m_name; private ObservableCollection<Container> m_children; private Container m_parent; private bool m_selected; private bool m_editing; /// <summary> /// Constructor /// </summary> /// <param name="name">name of object</param> public Container(string name) { m_name = name; m_children = new ObservableCollection<Container>(); m_parent = null; m_selected = false; m_editing = false; } /// <summary> /// Name of object /// </summary> public string Name { get { return m_name; } set { if (m_name != value) { m_name = value; OnPropertyChanged("Name"); } } } /// <summary> /// Index of object in parent's children /// /// If there's no parent, the index is -1 /// </summary> public int Index { get { if (m_parent != null) { return m_parent.Children.IndexOf(this); } return -1; } } /// <summary> /// Get the next item, assuming this is parented /// /// Returns null if end of list reached, or no parent /// </summary> public Container Next { get { if (m_parent != null) { int index = Index + 1; if (index < m_parent.Children.Count) { return m_parent.Children[index]; } } return null; } } /// <summary> /// List of children /// </summary> public ObservableCollection<Container> Children { get { return m_children; } } /// <summary> /// Selected status /// </summary> public bool Selected { get { return m_selected; } set { if (m_selected != value) { m_selected = value; OnPropertyChanged("Selected"); } } } /// <summary> /// Editing status /// </summary> public bool Editing { get { return m_editing; } set { if (m_editing != value) { m_editing = value; OnPropertyChanged("Editing"); } } } /// <summary> /// Parent of this object /// </summary> public Container Parent { get { return m_parent; } set { m_parent = value; } } /// <summary> /// WPF Property Changed event /// </summary> public event PropertyChangedEventHandler PropertyChanged; /// <summary> /// Handler to inform WPF that a property has changed /// </summary> /// <param name="name"></param> private void OnPropertyChanged(string name) { if (PropertyChanged != null) { PropertyChanged(this, new PropertyChangedEventArgs(name)); } } /// <summary> /// Add a child to this container /// </summary> /// <param name="child"></param> public void Add(Container child) { m_children.Add(child); child.m_parent = this; } /// <summary> /// Remove a child from this container /// </summary> /// <param name="child"></param> public void Remove(Container child) { m_children.Remove(child); child.m_parent = null; } } The two classes VisibilityConverter and VisibilityInverter are implementations of IValueConverter that translates bool to Visibility. They make sure the TextBlock is displayed when not editing, and the TextBox is displayed when editing.

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• Using Image Source with big images in WPF

  - by xyzzer

  I am working on an application that allows users to manipulate multiple images by using ItemsControl. I started running some tests and found that the app has problems displaying some big images - ie. it did not work with the high resolution (21600x10800), 20MB images from http://earthobservatory.nasa.gov/Features/BlueMarble/BlueMarble_monthlies.php, though it displays the 6200x6200, 60MB Hubble telescope image from http://zebu.uoregon.edu/hudf/hudf.jpg just fine. The original solution just specified an Image control with a Source property pointing at a file on a disk (through a binding). With the Blue Marble file - the image would just not show up. Now this could be just a bug hidden somewhere deep in the funky MVVM + XAML implementation - the visual tree displayed by Snoop goes like: Window/Border/AdornerDecorator/ContentPresenter/Grid/Canvas/UserControl/Border/ContentPresenter/Grid/Grid/Grid/Grid/Border/Grid/ContentPresenter/UserControl/UserControl/Border/ContentPresenter/Grid/Grid/Grid/Grid/Viewbox/ContainerVisual/UserControl/Border/ContentPresenter/Grid/Grid/ItemsControl/Border/ItemsPresenter/Canvas/ContentPresenter/Grid/Grid/ContentPresenter/Image... Now debug this! WPF can be crazy like that... Anyway, it turned out that if I create a simple WPF application - the images load just fine. I tried finding out the root cause, but I don't want to spend weeks on it. I figured the right thing to do might be to use a converter to scale the images down - this is what I have done: ImagePath = @"F:\Astronomical\world.200402.3x21600x10800.jpg"; TargetWidth = 2800; TargetHeight = 1866; and <Image> <Image.Source> <MultiBinding Converter="{StaticResource imageResizingConverter}"> <MultiBinding.Bindings> <Binding Path="ImagePath"/> <Binding RelativeSource="{RelativeSource Self}" /> <Binding Path="TargetWidth"/> <Binding Path="TargetHeight"/> </MultiBinding.Bindings> </MultiBinding> </Image.Source> </Image> and public class ImageResizingConverter : MarkupExtension, IMultiValueConverter { public Image TargetImage { get; set; } public string SourcePath { get; set; } public int DecodeWidth { get; set; } public int DecodeHeight { get; set; } public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture) { this.SourcePath = values[0].ToString(); this.TargetImage = (Image)values[1]; this.DecodeWidth = (int)values[2]; this.DecodeHeight = (int)values[3]; return DecodeImage(); } private BitmapImage DecodeImage() { BitmapImage bi = new BitmapImage(); bi.BeginInit(); bi.DecodePixelWidth = (int)DecodeWidth; bi.DecodePixelHeight = (int)DecodeHeight; bi.UriSource = new Uri(SourcePath); bi.EndInit(); return bi; } public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture) { throw new Exception("The method or operation is not implemented."); } public override object ProvideValue(IServiceProvider serviceProvider) { return this; } } Now this works fine, except for one "little" problem. When you just specify a file path in Image.Source - the application actually uses less memory and works faster than if you use BitmapImage.DecodePixelWidth. Plus with Image.Source if you have multiple Image controls that point to the same image - they only use as much memory as if only one image was loaded. With the BitmapImage.DecodePixelWidth solution - each additional Image control uses more memory and each of them uses more than when just specifying Image.Source. Perhaps WPF somehow caches these images in compressed form while if you specify the decoded dimensions - it feels like you get an uncompressed image in memory, plus it takes 6 times the time (perhaps without it the scaling is done on the GPU?), plus it feels like the original high resolution image also gets loaded and takes up space. If I just scale the image down, save it to a temporary file and then use Image.Source to point at the file - it will probably work, but it will be pretty slow and it will require handling cleanup of the temporary file. If I could detect an image that does not get loaded properly - maybe I could only scale it down if I need to, but Image.ImageFailed never gets triggered. Maybe it has something to do with the video memory and this app just using more of it with the deep visual tree, opacity masks etc. Actual question: How can I load big images as quickly as Image.Source option does it, without using more memory for additional copies and additional memory for the scaled down image if I only need them at a certain resolution lower than original? Also, I don't want to keep them in memory if no Image control is using them anymore.

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• Trouble displaying an object in WPF

  - by Scott

  I'm so new to this that I can't even phrase the question right... Anyway, I'm trying to do something very simple and have been unable to figure it out. I have the following class: public class Day : Control, INotifyPropertyChanged { public static readonly DependencyProperty DateProperty = DependencyProperty.Register("Date", typeof(int), typeof(Day)); public int Date { get { return (int)GetValue(DateProperty); } set { SetValue(DateProperty, value); if (PropertyChanged != null) { PropertyChanged(this, new PropertyChangedEventArgs("Date")); } } } public static readonly DependencyProperty DayNameProperty = DependencyProperty.Register("DayName", typeof(String), typeof(Day)); public String DayName { get { return (String)GetValue(DayNameProperty); } set { SetValue(DayNameProperty, value); if (PropertyChanged != null) { PropertyChanged(this, new PropertyChangedEventArgs("DayName")); } } } static Day() { DefaultStyleKeyProperty.OverrideMetadata(typeof(Day), new FrameworkPropertyMetadata(typeof(Day))); } #region INotifyPropertyChanged Members public event PropertyChangedEventHandler PropertyChanged; #endregion } I've learned that you can't call a constructor that has parameters in XAML so the only way to actually set some data for this class is through the two properties, DayName and Date. I created a ControlTemplate for Day which is as follows: <Style TargetType="{x:Type con:Day}"> <Setter Property="MinHeight" Value="20"/> <Setter Property="MinWidth" Value="80"/> <Setter Property="Height" Value="20"/> <Setter Property="Width" Value="80"/> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type con:Day}"> <Grid> <Grid.ColumnDefinitions> <ColumnDefinition/> <ColumnDefinition/> </Grid.ColumnDefinitions> <Rectangle Grid.ColumnSpan="2" x:Name="rectHasEntry" Fill="WhiteSmoke"/> <TextBlock Grid.Column="0" x:Name="textBlockDayName" Text="{TemplateBinding DayName}" FontFamily="Junction" FontSize="11" Background="Transparent" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="0,2,0,0"/> <TextBlock Grid.Column="1" x:Name="textBlockDate" Text="{TemplateBinding Date}" FontFamily="Junction" FontSize="11" Background="Transparent" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="0,2,0,0"/> <Rectangle Grid.ColumnSpan="2" x:Name="rectMouseOver" Fill="#A2C0DA" Opacity="0" Style="{StaticResource DayRectangleMouseOverStyle}"/> </Grid> </ControlTemplate> </Setter.Value> </Setter> </Style> I then render it on screen in my MainWindow thusly: <Window x:Class="WPFControlLibrary.TestHarness.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:con="clr-namespace:WPFControlLibrary.Calendar;assembly=WPFControlLibrary" Title="MainWindow" Height="500" Width="525" WindowStartupLocation="CenterScreen"> <Grid> <Grid.ColumnDefinitions> <ColumnDefinition Width="*"/> <ColumnDefinition Width="80"/> </Grid.ColumnDefinitions> <con:Day Grid.Column="1" Height="20" Width="80" DayName="Mon" Date="1"/> </Grid> And what I actually see is, well, nothing. If I put my cursor on the con:Day line of the XAML it'll highlight the correctly sized rectangle in the window but I don't see "Mon" on the left side of the rectangle and "1" on the right. What am I doing wrong? I suspect it's something simple but I'll be darned if I'm seeing it. My ultimate goal is to group a bunch of the Day controls within a Month control, which is then contained in a Year control as I'm trying to make a long Calendar Bar that lets you navigate through the months and years, while clicking on a Day would display any information saved on that date. But I can't even get the Day part to display independent of anything else so I'm a long way from the rest of the functionality. Any help would be greatly appreciated.

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• WPF problem modify style of images in multiple Button Templates

  - by user556415

  I'm trying to create a control panel for a video camera, the panel has buttons for up, down, left and right etc. Each camera function up, down, left and right is represented by three images (see code below) for the left side, middle and right side. The control panel is circular so the corner images kind of overlap (its complicated to explain this without a visual). When I click on up for example I have to hide the initial three images (leftside, middle and right side) and display another three images for left , middle and right that indicate that the button is pressed. I am achieving this by having a grid inside a button template. The problem I have is that for the corner images for the control there are really four images that represent this. For example for the top left corner the four images would be represent 1. Top not clicked. 2. Top Clicked and 3. Left Not clicked and 4. Left Clicked. My problem is if I need to make the images contained within the Top button have precedence when the top control is clicked or the images in the left button have precedence when the left button is clicked. So it's like I want to modify the left button's image visible property when the top button is clicked and vise versa. This is really difficult to explain so I apologize if it makes little sense but I can email the source code on request if anyone is interested in my predicament. <Grid> <Canvas> <!--<StackPanel>--> <Button Name="TopSide" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" Height="34" Width="102" Canvas.Left="97" Canvas.Top="60" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" > <Button.Template> <ControlTemplate TargetType="{x:Type Button}"> <Grid Width="100"> <Canvas> <Image Name="TopRightNormal" Source="Resources/topright_off.jpg" Height="34" Width="34" Canvas.Left="66"></Image> <Image Name="TopRightDown" Source="Resources/topright_down.jpg" Height="34" Width="34" Canvas.Left="66" Visibility="Hidden" ></Image> <Image Name="TopNormal" Source="Resources/topcenter_off.jpg" Height="34" Width="34" Canvas.Left="34" /> <Image Name="TopPressed" Source="Resources/topcenter_down.jpg" Height="34" Width="34" Canvas.Left="34" Visibility="Hidden" /> <Image Name="TopDisabled" Source="Resources/topcenter_off.jpg" Height="34" Width="34" Canvas.Left="34" Visibility="Hidden" /> <Image Name="TopLeftNormal" Source="Resources/topleft_off.jpg" Height="34" Width="34" Canvas.Left="2" ></Image> <Image Name="TopLeftDown" Opacity="0" Source="Resources/topleft_down.jpg" Height="34" Width="34" Canvas.Left="2" Visibility="Hidden" ></Image> </Canvas> </Grid> <ControlTemplate.Triggers> <Trigger Property="IsPressed" Value="True"> <Setter TargetName="TopNormal" Property="Visibility" Value="Hidden" /> <Setter TargetName="TopPressed" Property="Visibility" Value="Visible" /> <Setter TargetName="TopRightNormal" Property="Visibility" Value="Hidden" /> <Setter TargetName="TopRightDown" Property="Visibility" Value="Visible" /> <Setter TargetName="TopLeftNormal" Property="Visibility" Value="Hidden" /> <Setter TargetName="TopLeftDown" Property="Visibility" Value="Visible" /> <Setter TargetName="TopLeftDown" Property="Opacity" Value="100" /> </Trigger> <Trigger Property="IsEnabled" Value="False"> <Setter TargetName="TopNormal" Property="Visibility" Value="Hidden" /> <Setter TargetName="TopDisabled" Property="Visibility" Value="Visible" /> </Trigger> </ControlTemplate.Triggers> </ControlTemplate> </Button.Template> </Button> <!--</StackPanel>--> <!--<StackPanel>--> <Button Name="LeftSide" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" Canvas.Left="100" Canvas.Top="60" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" MouseDown="Button_MouseDown_1"> <Button.Template> <ControlTemplate TargetType="{x:Type Button}"> <Grid Width="34" Height="100"> <Canvas> <Image Name="TopLeftNormal" Source="Resources/topleft_off.jpg" Height="34" Width="34" Canvas.Left="0"></Image> <Image Name="TopLeftDown" Opacity="0" Source="Resources/topleft_leftdown.jpg" Height="34" Width="34" Canvas.Left="0" Visibility="Hidden" ></Image> <Image Name="Normal" Source="Resources/leftcenter_off.jpg" Height="34" Width="34" Canvas.Top="32" Canvas.Left="0"/> <Image Name="Pressed" Source="Resources/leftcenter_down.jpg" Visibility="Hidden" Canvas.Top="32" Height="34" Width="34" /> <Image Name="Disabled" Source="Resources/leftcenter_off.jpg" Visibility="Hidden" Height="34" Width="34" Canvas.Top="32" /> </Canvas> </Grid> <ControlTemplate.Triggers> <Trigger Property="IsPressed" Value="True"> <Setter TargetName="Normal" Property="Visibility" Value="Hidden" /> <Setter TargetName="Pressed" Property="Visibility" Value="Visible" /> <Setter TargetName="TopLeftNormal" Property="Visibility" Value="Hidden" /> <Setter TargetName="TopLeftNormal" Property="Opacity" Value="0" /> <Setter TargetName="TopLeftDown" Property="Visibility" Value="Visible" /> <Setter TargetName="TopLeftDown" Property="Opacity" Value="100" /> </Trigger> <Trigger Property="IsEnabled" Value="False"> <Setter TargetName="Normal" Property="Visibility" Value="Hidden" /> <Setter TargetName="Disabled" Property="Visibility" Value="Visible" /> </Trigger> </ControlTemplate.Triggers> </ControlTemplate> </Button.Template> </Button> <!--</StackPanel>--> <!--<StackPanel>--> <Button xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" Height="34" Width="34" Canvas.Left="165" Canvas.Top="92" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" MouseDown="Button_MouseDown_2" > <Button.Template> <ControlTemplate TargetType="{x:Type Button}"> <Grid> <Image Name="Normal" Source="Resources/rightcenter_off.jpg" /> <Image Name="Pressed" Source="Resources/rightcenter_down.jpg" Visibility="Hidden" /> <Image Name="Disabled" Source="Resources/rightcenter_off.jpg" Visibility="Hidden" /> </Grid> <ControlTemplate.Triggers> <Trigger Property="IsPressed" Value="True"> <Setter TargetName="Normal" Property="Visibility" Value="Hidden" /> <Setter TargetName="Pressed" Property="Visibility" Value="Visible" /> </Trigger> <Trigger Property="IsEnabled" Value="False"> <Setter TargetName="Normal" Property="Visibility" Value="Hidden" /> <Setter TargetName="Disabled" Property="Visibility" Value="Visible" /> </Trigger> </ControlTemplate.Triggers> </ControlTemplate> </Button.Template> </Button> <!--</StackPanel>--> <!--<StackPanel>--> <Button xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" Height="34" Width="34" Canvas.Left="133" Canvas.Top="124" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" > <Button.Template> <ControlTemplate TargetType="{x:Type Button}"> <Grid> <Image Name="BottomNormal" Source="Resources/bottomcenter_off.jpg" /> <Image Name="BottomPressed" Source="Resources/bottomcenter_down.jpg" Visibility="Hidden" /> <Image Name="BottomDisabled" Source="Resources/bottomcenter_off.jpg" Visibility="Hidden" /> </Grid> <ControlTemplate.Triggers> <Trigger Property="IsPressed" Value="True"> <Setter TargetName="BottomNormal" Property="Visibility" Value="Hidden" /> <Setter TargetName="BottomPressed" Property="Visibility" Value="Visible" /> </Trigger> <Trigger Property="IsEnabled" Value="False"> <Setter TargetName="BottomNormal" Property="Visibility" Value="Hidden" /> <Setter TargetName="BottomDisabled" Property="Visibility" Value="Visible" /> </Trigger> </ControlTemplate.Triggers> </ControlTemplate> </Button.Template> </Button> <!--</StackPanel>--> <Image Source="Resources/bottomright_off.jpg" Height="34" Width="34" Canvas.Left="165" Canvas.Top="124"></Image> <Image Source="Resources/bottomleft_off.jpg" Height="34" Width="34" Canvas.Left="100" Canvas.Top="124"></Image> <!--<ToggleButton Style="{StaticResource MyToggleButtonStyle}" Height="34" Width="34" Margin="150,100"/>--> </Canvas> </Grid>

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• How to change the overlapping order of TabItems in WPF TabControl

  - by sannoble

  I have created vertical TabItems with a Path object. The selected TabItem overlaps the unselected TabItems, this works fine. The overlapping is done by setting a negative margin in the TabItem Template. For the unselected TabItems right now a TabItem is overlapped by the TabItem below. For example in the picture Tab 4 overlaps Tab 3 and Tab 3 overlaps Tab 2. I would like to change the overlapping order for the unselected Tab Items, so that an unselected TabItem overlaps the TabItem below and is overlapped by the TabItem above, e.g. Tab 2 overlaps Tab 3 and Tab 3 overlaps Tab 4. I have tried to set the FlowDirection property of TabPanel, but this doesn't work. How can I achieve this? Any help is appreciated. Thanks in advance! Wrong overlapping of unselected TabItems: XAML-Code: <Style x:Key="styleMainNavTabControl" TargetType="{x:Type TabControl}"> <Setter Property="TabStripPlacement" Value="Left" /> <Setter Property="SnapsToDevicePixels" Value="true"/> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type TabControl}"> <Grid> <Grid.ColumnDefinitions> <ColumnDefinition Width="*" /> <ColumnDefinition Width="200"/> </Grid.ColumnDefinitions> <Border Grid.Column="0" Background="White" BorderBrush="Black" BorderThickness="0,0,1,0" Padding="20"> <ContentPresenter ContentSource="SelectedContent" /> </Border> <Border Grid.Column="1" Padding="0,30,10,0" Background="#F7F3F7"> <TabPanel Panel.ZIndex="1" Margin="-1,0,0,0" FlowDirection="RightToLeft" IsItemsHost="True" Background="Transparent"/> </Border> </Grid> </ControlTemplate> </Setter.Value> </Setter> </Style> <Style x:Key="styleMainNavTabItem" TargetType="{x:Type TabItem}"> <Setter Property="MinHeight" Value="90" /> <Setter Property="FontSize" Value="14" /> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type TabItem}"> <Grid Margin="0,0,0,-35"> <Path Name="TabPath" Stroke="Black" StrokeThickness="1" Fill="LightGray" Data="M 0,0 a 10,10 0 0 0 10,10 h 150 a 20,20 0 0 1 20,20 v 60 a 20,20 0 0 1 -20,20 h -150 a 10,10 0 0 0 -10,10 z" /> <ContentPresenter ContentSource="Header" Margin="10,2,10,2" VerticalAlignment="Center" TextElement.Foreground="#FF000000"/> </Grid> <ControlTemplate.Triggers> <Trigger Property="IsSelected" Value="True"> <Setter Property="Panel.ZIndex" Value="100" /> <Setter TargetName="TabPath" Property="Fill" Value="White" /> <Setter TargetName="TabPath" Property="Data" Value="M 0,0 a 10,10 0 0 0 10,10 h 150 a 20,20 0 0 1 20,20 v 60 a 20,20 0 0 1 -20,20 h -150 a 10,10 0 0 0 -10,10" /> </Trigger> <Trigger Property="IsSelected" Value="False"> <Setter Property="Panel.ZIndex" Value="90" /> </Trigger> </ControlTemplate.Triggers> </ControlTemplate> </Setter.Value> </Setter>

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• MVVM: Binding radio buttons to a view model?

  - by David Veeneman

  I have been trying to bind a group of radio buttons to a view model using the IsChecked button. After reviewing other posts, it appears that the IsChecked property simply doesn't work. I have put together a short demo that reproduces the problem, which I have included below. Here is my question: Is there a straightforward and reliable way to bind radio buttons using MVVM? Thanks. Additional information: The IsChecked property doesn't work for two reasons: When a button is selected, the IsChecked properties of other buttons in the group don't get set to false. When a button is selected, its own IsChecked property does not get set after the first time the button is selected. I am guessing that the binding is getting trashed by WPF on the first click. Demo project: Here is the code and markup for a simple demo that reproduces the problem. Create a WPF project and replace the markup in Window1.xaml with the following: <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" Loaded="Window_Loaded"> <StackPanel> <RadioButton Content="Button A" IsChecked="{Binding Path=ButtonAIsChecked, Mode=TwoWay}" /> <RadioButton Content="Button B" IsChecked="{Binding Path=ButtonBIsChecked, Mode=TwoWay}" /> </StackPanel> </Window> Replace the code in Window1.xaml.cs with the following code (a hack), which sets the view model: using System.Windows; namespace WpfApplication1 { /// <summary> /// Interaction logic for Window1.xaml /// </summary> public partial class Window1 : Window { public Window1() { InitializeComponent(); } private void Window_Loaded(object sender, RoutedEventArgs e) { this.DataContext = new Window1ViewModel(); } } } Now add the following code to the project as Window1ViewModel.cs: using System.Windows; namespace WpfApplication1 { public class Window1ViewModel { private bool p_ButtonAIsChecked; /// <summary> /// Summary /// </summary> public bool ButtonAIsChecked { get { return p_ButtonAIsChecked; } set { p_ButtonAIsChecked = value; MessageBox.Show(string.Format("Button A is checked: {0}", value)); } } private bool p_ButtonBIsChecked; /// <summary> /// Summary /// </summary> public bool ButtonBIsChecked { get { return p_ButtonBIsChecked; } set { p_ButtonBIsChecked = value; MessageBox.Show(string.Format("Button B is checked: {0}", value)); } } } } To reproduce the problem, run the app and click Button A. A message box will appear, saying that Button A's IsChecked property has been set to true. Now select Button B. Another message box will appear, saying that Button B's IsChecked property has been set to true, but there is no message box indicating that Button A's IsChecked property has been set to false--the property hasn't been changed. Now click Button A again. The button will be selected in the window, but no message box will appear--the IsChecked property has not been changed. Finally, click on Button B again--same result. The IsChecked property is not updated at all for either button after the button is first clicked.

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• How to set property only on second column of a ListView?

  - by Lernkurve

  Introduction I have a ListView and want to format only the second column. The following XAML code does that: <ListView x:Name="listview"> <ListView.View> <GridView> <GridViewColumn Header="Property" DisplayMemberBinding="{Binding Path=Key}" Width="100"/> <!-- <GridViewColumn Header="Value" DisplayMemberBinding="{Binding Path=Value}" Width="250">--> <GridViewColumn Header="Value" Width="250"> <GridViewColumn.CellTemplate> <DataTemplate> <TextBlock Text="{Binding Path=Value}" Foreground="CornflowerBlue" AutomationProperties.Name={Binding Path="Key"}/> </DataTemplate> </GridViewColumn.CellTemplate> </GridViewColumn> </GridView> </ListView.View> </ListView> The one problem I have is that the AutomationProperties.Name property is not being set. I was checking it with the Coded UI Test Builder and the property is empty. The Text and the Foreground property are being set correctly. Question Does anyone know why AutomationProperties.Name is not being set? Additional information Strangly enough, the following XAML code does set the AutomationProperties.Name <ListView x:Name="listview"> <ListView.Resources> <Style TargetType="TextBlock"> <Setter Property="AutomationProperties.Name" Value="{Binding Key}"/> </Style> </ListView.Resources> <ListView.View> <GridView> <GridViewColumn Header="Property" DisplayMemberBinding="{Binding Path=Key}" Width="100"/> <GridViewColumn Header="Value" DisplayMemberBinding="{Binding Path=Value}" Width="250"/> </GridView> </ListView.View> </ListView> The problem here though is that AutomationProperties.Name is being set on all the columns. But I only want it on the second one because otherwise my Coded UI Test code returns the wrong value (that of the first column, instead of that of the second column which I want).

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• How can I bind a custom color to WPF toolkit ColorPicker? [on hold]

  - by tube-builder

  I need to bind the SelectedColor property of ColorPicker to a custom color which is not present in available colors. I created a simple test to show my problem. My xaml: <xctk:ColorPicker SelectedColor="{Binding Path=Test}"></xctk:ColorPicker> Code behind (CurrentStyle.PenColor returns an integer value which equals 13109765): public Color Test { get; set; } public MyClass() { DataContext = this; Test = Color.FromArgb((byte)((CurrentStyle.PenColor >> 24) & 0xFF), (byte)((CurrentStyle.PenColor >> 16) & 0xFF), (byte)((CurrentStyle.PenColor >> 8) & 0xFF), (byte)(CurrentStyle.PenColor & 0xFF)); InitializeComponent(); } And that's how my ColorPicker looks like when the window is loaded (I don't have enough rep to post images so it's just links): http://s22.postimg.org/frzh2fgy9/image.png Though, when I go to Advanced colors I can see that the color has been recognized and set correctly. Here is a pic: http://s13.postimg.org/gjv4cmy07/image.png Hope for your help. Thanks a lot! EDIT I implemented INotifyPropertyChanged, still to no avail. Here's the code: public Color Test { get { return test; } set { if (test != value) { test = value; OnPropertyChanged("Test"); } } } public event PropertyChangedEventHandler PropertyChanged; protected void OnPropertyChanged(string prop) { if (this.PropertyChanged != null) this.PropertyChanged(this, new PropertyChangedEventArgs(prop)); } Maybe I'm doing smth wrong here.

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• how to pass data when using MenuItem.ItemContainerStyle

  - by black sensei

  Hello Experts! i've been trying to have a dynamic ContextMenu to show the name property of each of the object in its collection of objects. here is concrete example ,i'm connecting to a webservice to pull contacts and groups of a particular account.so i have those as global variables.i display the contacts in a listbox and i want to show on right click of a contact in the listbox the list of groups that it can be added to. to be able to add a contact to a group i need the id of the contact(which i have) and the id of the group which i'm looking for here is my code. xmlns:serviceAdmin="clr-namespace:MyWpfApp.serviceAdmin" ...... <ListBox.ContextMenu> <ContextMenu> <MenuItem Header="Refresh" Click="RefreshContact_Click"></MenuItem> <MenuItem Header="Add New Contact" Click="ContactNew_Click"></MenuItem> <MenuItem Header="Add to Group" Name="groupMenus"> //<!--<MenuItem.Resources> // <DataTemplate DataType="{x:Type serviceAdmin:groupInfo}" x:Key="groupMenuKey" > // <MenuItem> // <TextBlock Text="{Binding name}" /> // </MenuItem> // </DataTemplate> // </MenuItem.Resources>--> <MenuItem.ItemContainerStyle> <Style> <Setter Property="MenuItem.Header" Value="{Binding name}"/> <Setter Property="MenuItem.Tag" Value="{Binding id}" /> </Style> </MenuItem.ItemContainerStyle> </MenuItem> <MenuItem Header="Delete Selected" Click="ContactDelete_Click"></MenuItem> </ContextMenu> </ListBox.ContextMenu> ...... and on xaml.cs //this code is in the method that loads the groups loadedgroup = service.getGroups(session.key, null); groupListBox.ItemsSource = loadedgroup; groupMenus.ItemsSource = loadedgroup.ToList(); this code is showing the name of the groups alright but i need the id of the group clicked on. If you've noticed i commented a portion of the xaml code. with that i could bind(with ease) the id to the tag.But it won't work and the MenuItem.ItemContainerStyle is the one working but then i'm lost: Question 1 : how do i create a handler method for a click event of a submenu that has the names of the groups? Question 2 : how do i get the clicked group id to work with? thanks for reading and kindly help me in this

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• WPF Button Storyboard with an image for MouseOver

  - by Vinjamuri

  I have the following xaml for changing the image for WPF button when mouse is on the button. It give below error. Any help is appreciated... 'System.Windows.Media.Animation.DoubleAnimation' animation object cannot be used to animate property 'Source' because it is of incompatible type 'System.Windows.Media.ImageSource'. <Style TargetType="{x:Type local:ButtonControl}"> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type local:ButtonControl}"> <Grid> <VisualStateManager.VisualStateGroups> <VisualStateGroup x:Name="CommonStates"> <VisualState x:Name="MouseOver"> <Storyboard> <DoubleAnimation Storyboard.TargetName="img" Storyboard.TargetProperty="Source" To="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=MouseOverImage}" /> </Storyboard> </VisualStateGroup> </VisualStateManager.VisualStateGroups> <Border> <Image x:Name="img" Source="pack://application:,,,/Recipe_06_13;component/Resources/normal.bmp" /> </Border> </Grid> </ControlTemplate> </Setter.Value> </Setter> </Style>

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• Strange Behaviour WPF TreeView ItemContainerStyle and ItemTemplate

  - by Matze

  I just noticed some strange behaviour of WPF's TreeView. I added both ItemContainerStyle to bind to "IsSelected" of my ViewModel and an ItemsTemplated for custom display of my data. But now the user cannot change the selected node anymore. For testing purposes I created a similar UI using ListView and Expander. This version works as excepted. Any tips why TreeView does fail? <TreeView ItemsSource="{Binding ElementName=frame, Path=list}"> <TreeView.ItemContainerStyle> <Style TargetType="{x:Type TreeViewItem}" > <Setter Property="IsSelected" Value="{Binding Mode=TwoWay, Path=IsSelected}"/> </Style> </TreeView.ItemContainerStyle> <TreeView.ItemTemplate> <HierarchicalDataTemplate> <TreeViewItem Header="{Binding}"> <TextBlock Text="{Binding Path= Item.SomeData}"/> </TreeViewItem> </HierarchicalDataTemplate> </TreeView.ItemTemplate> </TreeView>

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• WPF Databound RadioButton ListBox

  - by Mark

  I am having problems getting a databound radiobutton listbox in WPF to respond to user input and reflect changes to the data it's bound to (i.e., to making changes in the code). The user input side works fine (i.e., I can select a radiobutton and the list behaves as expected). But every attempt to change the selection in code fails. Silently (i.e., no exception). Here's the relevant section of the XAML (I think): <Setter Property="ItemContainerStyle"> <Setter.Value> <Style TargetType="{x:Type ListBoxItem}" > <Setter Property="Margin" Value="2" /> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type ListBoxItem}"> <Border Name="theBorder" Background="Transparent"> <RadioButton Focusable="False" IsHitTestVisible="False" IsChecked="{Binding Path=IsSelected, RelativeSource={RelativeSource TemplatedParent}, Mode=TwoWay}" > <ContentPresenter /> </RadioButton> </Border> </ControlTemplate> </Setter.Value> </Setter> </Style> </Setter.Value> I bind the listbox to a List of SchoolInfo objects. SchoolInfo contains a property called IsSelected: public bool IsSelected { get { return isSelected; } set { if( value != isSelected ) { isSelected = value; this.OnPropertyChanged("IsSelected"); } } } The OnPropertyChanged() stuff was something I put in during my experimentation. It doesn't solve the problem. Things like the following fail: ((SchoolInfo) lbxSchool.Items[1]).IsSelected = true; lbxSchool.SelectedIndex = 1; They fail silently -- no exception is thrown, but the UI doesn't show the item being selected. Mark

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• WPF TreeViewItem Context Menu Unhighlights Item

  - by Snea

  I have been having problems with this for some time now, and have come up with some less-than-desirable solutions. The problem is that when a TreeViewItem's context menu is opened, the TreeViewItem is greyed out. Is it possible for a TreeViewItem to stay highlighted while its ContextMenu is open? The problem with the TreeViewItem greying out, is that it gives no relation to the context menu and the TreeViewItem, and it looks ugly. Generally, the code I use for setting a context menu is this. Sometimes the context menu will be generated by the code with a PreviewRightMouseButtonDown EventSetter, but it doesn't make a difference. <TreeView> <TreeView.Resources> <Style TargetType="{x:Type TreeViewItem}"> <Setter Property="ContextMenu"> <Setter.Value> <ContextMenu> <MenuItem Header="Menu Item 1" /> <MenuItem Header="Menu Item 2" /> </ContextMenu> </Setter.Value> </Setter> </Style> </TreeView.Resources> <TreeViewItem Header="Item 1"> <TreeViewItem Header="Sub-Item 1"/> </TreeViewItem> <TreeViewItem Header="Item 2"></TreeViewItem> </TreeView> So far the only solution I have found is to override the "grey" unfocused color with the focused color, but then the TreeView never seems unfocused, such as when another control is clicked on. I have had problems with ListViews as well.

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• Load richtextbox from memorystream. WPF/VB>NET

  - by Peter

  Hi, I have some trouble with loading a richtextbox from a memorystream. I have some data in a database table stored as a byte array, I convert it to a string and load it into a memorystream and then I want to load that memory stream in the richtextbox. The application breaks on Dim tr As New TextRange(rtbTemplate.Document.ContentStart, rtbTemplate.Document.ContentEnd) though. Code for getting the data from the database Dim TemplateData As Byte() = TemplateDataTableInstance.Rows(0).Item("TemplateData") Dim strTemplateData As String Dim enc As New System.Text.UTF8Encoding() strTemplateData = enc.GetString(TemplateData) ' I put a messagebox here to check if I get the data I want and I do Now, how do I sort out the rest? I have Dim strDataFormat As String = DataFormats.Rtf Using ms As New MemoryStream(strTemplateData) Dim tr As New TextRange(rtbTemplate.Document.ContentStart, rtbTemplate.Document.ContentEnd) tr.Load(ms, strDataFormat) End Using and my richtextbox in xaml <RichTextBox x:Name="rtbLetter"> <RichTextBox.Resources> <Style TargetType="{x:Type Paragraph}"> <Setter Property="Margin" Value="0"/> </Style> </RichTextBox.Resources> <FlowDocument FontSize="12" FontFamily="Times New Roman"> </FlowDocument> </RichTextBox> Any help is appreciated.

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• WPF Repeater (like) control for collection source??

  - by Sonic Soul

  I have a WPF DataGrid bound to ObservableCollection. Each item in my collection has Property which is a List. In my row details pane, i would like to write out formatted textblocks for each item in this collection. The end result would be something equivalent to: <TextBlock Style="{StaticResource NBBOTextBlockStyle}" HorizontalAlignment="Right"> <TextBlock.Inlines> <Run FontWeight="Bold" Text="{Binding Path=Exchanges[0].Name}" /> <Run FontWeight="Bold" Text="{Binding Path=Exchanges[0].Price}" /> <LineBreak /> <Run Foreground="LightGray" Text="{Binding Path=Exchanges[0].Quantity}" /> </TextBlock.Inlines> </TextBlock> <TextBlock Style="{StaticResource NBBOTextBlockStyle}"> <TextBlock.Inlines> <Run FontWeight="Bold" Text="{Binding Path=Exchanges[1].Name}" /> <Run FontWeight="Bold" Text="{Binding Path=Exchanges[1].Price}" /> <LineBreak /> <Run Foreground="LightGray" Text="{Binding Path=Exchanges[1].Quantity}" /> </TextBlock.Inlines> </TextBlock> and so on 0-n times. I've tried using ItemsControl for this: <ItemsControl ItemsSource="{Binding Path=Exchanges}"> <DataTemplate> <Label>test</Label> </DataTemplate> </ItemsControl> however, this appears to be only meant for more static sources, as it throws the following exception (collection is not altered after creation): ItemsControl Operation is not valid while ItemsSource is in use. Access and modify elements with ItemsControl.ItemsSource instead Is there another way to achieve this?

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• Wpf ListBox Trigger not working for IsFocused Property.

  - by viky

  I want to style my ListBox and displaying some Border around it, i want to hide this Border when ListBox gets focus, <Trigger Property="IsFocused" Value="True"> <Setter Property="Visibility" TargetName="border" Value="Collapsed"/> </Trigger> Same thing i m using in TextBox also and it is working properly, why this Trigger not working for ListBox? Edit: i am having this Style for my ListBox <ControlTemplate TargetType="{x:Type local:ListBox}"> <Border SnapsToDevicePixels="true" x:Name="Bd" CornerRadius="5" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Padding="1"> <Grid> <local:ScrollViewer Focusable="false" Padding="{TemplateBinding Padding}"> <ItemsPresenter SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/> </local:ScrollViewer> <Border CornerRadius="5" Background="Red" x:Name="border"> <TextBlock VerticalAlignment="Center" FontWeight="Bold" Foreground="White" Text="{TemplateBinding Message}" FontFamily="Courier New" /> </Border> </Grid> </Border> </DockPanel> <ControlTemplate.Triggers> <Trigger Property="IsFocused" Value="True"> <Setter Property="Visibility" TargetName="border" Value="Collapsed"/> </Trigger> <Trigger Property="IsEnabled" Value="false"> <Setter Property="Background" TargetName="Bd" Value="{DynamicResource {x:Static SystemColors.ControlBrushKey}}"/> </Trigger> <Trigger Property="IsGrouping" Value="true"> <Setter Property="ScrollViewer.CanContentScroll" Value="false"/> </Trigger> </ControlTemplate.Triggers>

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• WPF TabBarControl Setting Focus to element when tab changes

  - by Aran Mulholland

  I have a TabControl that is bound to a view model <TabControl ItemsSource="{Binding Path=ViewModelCollection}" > <TabControl.ItemContainerStyle> <Style TargetType="TabItem" BasedOn="{StaticResource {x:Type TabItem}}"> <Setter Property="Header" Value="{Binding Title}" /> <Setter Property="Content" Value="{Binding}" /> </Style> </TabControl.ItemContainerStyle> </TabControl> Each Tab simply contains a View Model Item. I use a data template to display this. <!-- View Model Template --> <DataTemplate DataType="{x:Type local:ViewModelItem}"> <DockPanel> <TextBox Text="I want this to have the focus"/> </DockPanel> </DataTemplate> When the current tab is changed i want the focus to be on the textbox (this is a simple example, in my production code i have a datagrid) in the data template. how do i accomplish this?

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• WPF - Adding ContentControl to Custom Canvas

  - by Alp Hancioglu

  I have a custom DrawingCanvas which is inherited from Canvas. When I add a ContentControl to DrawingCanvas with the following code nothing shows up. GraphicsRectangle rect = new GraphicsRectangle(0, 0, 200, 200, 5, Colors.Blue); DrawingContainer host = new DrawingContainer(rect); ContentControl control = new ContentControl(); control.Width = 200; control.Height = 200; DrawingCanvas.SetLeft(control, 100); DrawingCanvas.SetTop(control, 100); control.Style = Application.Current.Resources["DesignerItemStyle"] as Style; control.Content = host; drawingCanvas.Children.Add(control); GraphicsRectangle is a DrawingVisual and the constructor above draws a Rect with (0,0) top left point and length of 200 to the drawingContext of GraphicsRectangle. DrawingContainer is a FrameworkElement and it has one child, which is rect above, given with constructor. DrawingContainer implements GetVisualChild and VisualChildrenCount override methods. At last, Content property of ContentControl is set to the DrawingContainer to be able to show the DrawingVisual's content. When I add the created ContentControl to a regular Canvas, control is showed correctly. I guess the reason is that DrawingCanvas doesn't implement ArrangeOverride method. It only implements MeasureOverride method. Also DrawingContainer doesn't implement Measure and Arrange override methods. Any ideas?

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• WPF: Exception if i add a eventhandler to a MenuItem (in a ListBox)

  - by user437899

  Hi, i wanted a contextmenu for my ListBoxItems. So i created this: <ListBox Name="listBoxName"> <ListBox.ItemTemplate> <DataTemplate> <TextBlock Text="{Binding UserName}" /> </DataTemplate> </ListBox.ItemTemplate> <ListBox.ItemContainerStyle> <Style TargetType="ListBoxItem"> <Setter Property="ContextMenu"> <Setter.Value> <ContextMenu> <MenuItem Header="View" Name="MenuItemView" /> </ContextMenu> </Setter.Value> </Setter> </Style> </ListBox.ItemContainerStyle> </ListBox> This works great. I have the contextmenu for all items, but if i want to add a click-eventhandler to the menuitem, like this: <MenuItem Header="View" Name="MenuItemView" Click="MenuItemView_Click" /> I get a XamlParseException when the window is created. InnerException: The Object System.Windows.Controls.MenuItem cannot be converted to type System.Windows.Controls.Grid It throws only the exception if i add a event-handler. The event-method is empty.

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• WPF ContextMenu bind some property to another property of the same control

  - by bebicasoft

  I have a ContextMenu and a ColumnHeaderStyle defined in Window.Resource section witch i use-it to a DataGrid ColumnHeader. My code is something like this: <ContextMenu x:Key="cm_columnHeaderMenu"/> <Style x:Key="DefaultColumnHeaderStyle" TargetType="{x:Type DataGridColumnHeader}"> <Setter Property="ContextMenu" Value="{StaticResource cm_columnHeaderMenu}" /> </Style> <DataGrid Grid.Column="2" Grid.Row="1" x:Name="dgridFiles" IsReadOnly="True" ColumnHeaderStyle="{StaticResource DefaultColumnHeaderStyle}"> I want to know if I can (and if the answer it true, then HOW I could do it) bind the ContextMenu Visibility property to same control ContextMenu Items.Count>0 property. Initially based on some other treeView control selections made there shoud be no items in the context menu, but i wish to add dinamically items in ContextMenu based on selection in treeView. This part is done, the context has those items. On some selections there are no-items, but still on the grid it appears an empty ContextMenu. So I believe the easiest part it would be to bind the Visibility to Items.Count property of the same control. Sorry if my english is not good enought, I'll try to explain better if i didnt make clear 1st time.

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