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  • WPF (irc) chat log control

    - by user408952
    I'm trying to learn WPF and was thinking about creating a simple IRC client. The most complicated part is to create the chat log. I want it to look more or less like the one in mIRC: or irssi: The important parts are that the text should be selectable, lines should wrap and it should be able to handle quite large logs. The alternatives that I can come up with are: StackPanel inside a ScrollViewer where each line is a row ListView, since that seems more suitable for dynamic content/data binding. Create an own control that does the rendering on its own. Is there any WPF guru out there that has some ideas on which direction to take and where to start?

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  • How different is WPF from ASP.NET [closed]

    - by Tom
    I have been quickly moved over to a different project at work because the project needs more help. I was chosen because they are confident in my abilities and they thought I would be best fit for the next couple weeks to help finish the application out. I am a little nervous. I do tend to pick things up quickly. I was moved to a different project at the beginning of this year and now I know it like the back of my hand. Previously I was on another project. Both of these projects were an ASP.NET web application, which I believe is considered a winforms web application? The project I am moving to is a desktop WPF application. I have read that many people enjoy developing their applications with WPF. I just have never dealt/worked with WPF before. I like to consider myself pretty good at ASP.NET/C# and I do a solid job. We deal with a lot of data processing from the database and report generation. So I do get to experience C# more so than some web applications where the C# end of it is mostly just event driven and simple instructions. How different are the two? Will it be completely foreign to me? Or is it just a different way of looking at a problem and I can familiarize myself quickly? Thanks for the input.

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  • Grid-Based 2D Lighting Problems

    - by Lemoncreme
    I am aware this question has been asked before, but unfortunately I am new to the language, so the complicated explanations I've found do not help me in the least. I need a lighting engine for my game, and I've tried some procedural lighting systems. This method works the best: if (light[xx - 1, yy] > light[xx, yy]) light[xx, yy] = light[xx - 1, yy] - lightPass; if (light[xx, yy - 1] > light[xx, yy]) light[xx, yy] = light[xx, yy - 1] - lightPass; if (light[xx + 1, yy] > light[xx, yy]) light[xx, yy] = light[xx + 1, yy] - lightPass; if (light[xx, yy + 1] > light[xx, yy]) light[xx, yy] = light[xx, yy + 1] - lightPass; (Subtracts adjacent values by 'lightPass' variable if they are more bright) (It's in a for() loop) This is all fine and dandy except for a an obvious reason: The system favors whatever comes first in the for() loop This is what the above code looks like applied to my game: If I could get some help on creating a new procedural or otherwise lighting system I would really appreciate it!

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  • Implementing movement on a grid

    - by Dvole
    I have a simple snake game, where I have other NPC snakes on the field. How do I calculate the movement of those other snakes so that they did not hit walls, and each other? So far I have it like this: I check for current coordinates and when there is a wall nearby I change direction to some other one. And so on, this way the snakes never collide the walls. But not actually colliding other snakes, how do I prevent this? I figured I could probe for the direction I'm heading and if there is anything there I would change direction too, but there is a set of situation where this won't work, for example if another snake will block off all exits later.

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  • Displaying a grid based map using C++ and sdl

    - by user15386
    I am trying to create a roguelike game using c++ and SDL. However, I am having trouble getting it to display the map, which is represented by a 2d array of a tile class. Currently, my code is this: for (int y = 0; y!=MAPHEIGHT; y++) { for (int x = 0; x!=MAPWIDTH 1; x++) { apply_surface( x * TILEWIDTH, y * TILEHEIGHT, mymap[x][y].image, screen ); } } However, running this code causes it to both dither for a while before opening the SDL window, and (usually) tell me there is an access violation. How can I display my map?

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  • How to exit grid with ctrl-TAB when grid is on a tabpage (onkeydown works when grid not on tabpage)

    - by Charles Hankey
    winforms .net 3.5 Ultrawingrid 9.2 In my subclass of Ultrawingrid.Ultragrid : Protected Overrides Sub OnKeyDown(ByVal e As System.Windows.Forms.KeyEventArgs) If e.KeyCode = Windows.Forms.Keys.Tab andalso e.control = True then SetFocusToNextControl(True) End if Mybase.OnKeyDown(e) End Sub This works fine. But when the grid is dropped on a TabControl tabpage, the ctrl-tab looks very different to the sub above. e.keycode is seen as controlkey {17} I realize that by default cntrl-Tab moves between tabpages. I need to override this behavior. My thought is I probably need a subclass of the tabControl which will pass the keycombo through just as the form does but I confess to being clueless as to how to accomplish that. I tried to override the onkeydown of a tabcontrol subclass and just issuing a return and not and base call to onkeydown if the ctrl-tab combo was pressed but it seemed to see the e.keycode as controlkey as well. FWIW I tried a different combination like ctrl-E and got pretty much the same result with focus disappearing from the grid but not going anywhere I could detect. The sub still saw the e.control as controlkey. Oddly, ctrl-X, ctrl-A etc all work in the grid and a ctrl-Delete combo I put in the subclass for deleting a row works fine. Once again - grid directly on form and it all works. I'm definitely over my head on this one. Guidance much appreciated. vb or c# fine. TIA

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  • ParallelWork: Feature rich multithreaded fluent task execution library for WPF

    - by oazabir
    ParallelWork is an open source free helper class that lets you run multiple work in parallel threads, get success, failure and progress update on the WPF UI thread, wait for work to complete, abort all work (in case of shutdown), queue work to run after certain time, chain parallel work one after another. It’s more convenient than using .NET’s BackgroundWorker because you don’t have to declare one component per work, nor do you need to declare event handlers to receive notification and carry additional data through private variables. You can safely pass objects produced from different thread to the success callback. Moreover, you can wait for work to complete before you do certain operation and you can abort all parallel work while they are in-flight. If you are building highly responsive WPF UI where you have to carry out multiple job in parallel yet want full control over those parallel jobs completion and cancellation, then the ParallelWork library is the right solution for you. I am using the ParallelWork library in my PlantUmlEditor project, which is a free open source UML editor built on WPF. You can see some realistic use of the ParallelWork library there. Moreover, the test project comes with 400 lines of Behavior Driven Development flavored tests, that confirms it really does what it says it does. The source code of the library is part of the “Utilities” project in PlantUmlEditor source code hosted at Google Code. The library comes in two flavors, one is the ParallelWork static class, which has a collection of static methods that you can call. Another is the Start class, which is a fluent wrapper over the ParallelWork class to make it more readable and aesthetically pleasing code. ParallelWork allows you to start work immediately on separate thread or you can queue a work to start after some duration. You can start an immediate work in a new thread using the following methods: void StartNow(Action doWork, Action onComplete) void StartNow(Action doWork, Action onComplete, Action<Exception> failed) For example, ParallelWork.StartNow(() => { workStartedAt = DateTime.Now; Thread.Sleep(howLongWorkTakes); }, () => { workEndedAt = DateTime.Now; }); Or you can use the fluent way Start.Work: Start.Work(() => { workStartedAt = DateTime.Now; Thread.Sleep(howLongWorkTakes); }) .OnComplete(() => { workCompletedAt = DateTime.Now; }) .Run(); Besides simple execution of work on a parallel thread, you can have the parallel thread produce some object and then pass it to the success callback by using these overloads: void StartNow<T>(Func<T> doWork, Action<T> onComplete) void StartNow<T>(Func<T> doWork, Action<T> onComplete, Action<Exception> fail) For example, ParallelWork.StartNow<Dictionary<string, string>>( () => { test = new Dictionary<string,string>(); test.Add("test", "test"); return test; }, (result) => { Assert.True(result.ContainsKey("test")); }); Or, the fluent way: Start<Dictionary<string, string>>.Work(() => { test = new Dictionary<string, string>(); test.Add("test", "test"); return test; }) .OnComplete((result) => { Assert.True(result.ContainsKey("test")); }) .Run(); You can also start a work to happen after some time using these methods: DispatcherTimer StartAfter(Action onComplete, TimeSpan duration) DispatcherTimer StartAfter(Action doWork,Action onComplete,TimeSpan duration) You can use this to perform some timed operation on the UI thread, as well as perform some operation in separate thread after some time. ParallelWork.StartAfter( () => { workStartedAt = DateTime.Now; Thread.Sleep(howLongWorkTakes); }, () => { workCompletedAt = DateTime.Now; }, waitDuration); Or, the fluent way: Start.Work(() => { workStartedAt = DateTime.Now; Thread.Sleep(howLongWorkTakes); }) .OnComplete(() => { workCompletedAt = DateTime.Now; }) .RunAfter(waitDuration);   There are several overloads of these functions to have a exception callback for handling exceptions or get progress update from background thread while work is in progress. For example, I use it in my PlantUmlEditor to perform background update of the application. // Check if there's a newer version of the app Start<bool>.Work(() => { return UpdateChecker.HasUpdate(Settings.Default.DownloadUrl); }) .OnComplete((hasUpdate) => { if (hasUpdate) { if (MessageBox.Show(Window.GetWindow(me), "There's a newer version available. Do you want to download and install?", "New version available", MessageBoxButton.YesNo, MessageBoxImage.Information) == MessageBoxResult.Yes) { ParallelWork.StartNow(() => { var tempPath = System.IO.Path.Combine( Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), Settings.Default.SetupExeName); UpdateChecker.DownloadLatestUpdate(Settings.Default.DownloadUrl, tempPath); }, () => { }, (x) => { MessageBox.Show(Window.GetWindow(me), "Download failed. When you run next time, it will try downloading again.", "Download failed", MessageBoxButton.OK, MessageBoxImage.Warning); }); } } }) .OnException((x) => { MessageBox.Show(Window.GetWindow(me), x.Message, "Download failed", MessageBoxButton.OK, MessageBoxImage.Exclamation); }); The above code shows you how to get exception callbacks on the UI thread so that you can take necessary actions on the UI. Moreover, it shows how you can chain two parallel works to happen one after another. Sometimes you want to do some parallel work when user does some activity on the UI. For example, you might want to save file in an editor while user is typing every 10 second. In such case, you need to make sure you don’t start another parallel work every 10 seconds while a work is already queued. You need to make sure you start a new work only when there’s no other background work going on. Here’s how you can do it: private void ContentEditor_TextChanged(object sender, EventArgs e) { if (!ParallelWork.IsAnyWorkRunning()) { ParallelWork.StartAfter(SaveAndRefreshDiagram, TimeSpan.FromSeconds(10)); } } If you want to shutdown your application and want to make sure no parallel work is going on, then you can call the StopAll() method. ParallelWork.StopAll(); If you want to wait for parallel works to complete without a timeout, then you can call the WaitForAllWork(TimeSpan timeout). It will block the current thread until the all parallel work completes or the timeout period elapses. result = ParallelWork.WaitForAllWork(TimeSpan.FromSeconds(1)); The result is true, if all parallel work completed. If it’s false, then the timeout period elapsed and all parallel work did not complete. For details how this library is built and how it works, please read the following codeproject article: ParallelWork: Feature rich multithreaded fluent task execution library for WPF http://www.codeproject.com/KB/WPF/parallelwork.aspx If you like the article, please vote for me.

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  • DoubleAnimation in ScaleTransform

    - by Adam S
    I'm trying, as an exhibition, to use a DoubleAnimation on the ScaleX and ScaleY properties of a ScaleTransform. I have a rectangle (144x144) which I want to make rectangular over five seconds. My XAML: <Window x:Class="ScaleTransformTest.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"> <Grid> <Rectangle Name="rect1" Width="144" Height="144" Fill="Aqua"> <Rectangle.RenderTransform> <ScaleTransform ScaleX="1" ScaleY="1" /> </Rectangle.RenderTransform> </Rectangle> </Grid> </Window> My C#: private void Window_Loaded(object sender, RoutedEventArgs e) { ScaleTransform scaly = new ScaleTransform(1, 1); rect1.RenderTransform = scaly; Duration mytime = new Duration(TimeSpan.FromSeconds(5)); Storyboard sb = new Storyboard(); DoubleAnimation danim1 = new DoubleAnimation(1, 1.5, mytime); DoubleAnimation danim2 = new DoubleAnimation(1, 0.5, mytime); sb.Children.Add(danim1); sb.Children.Add(danim2); Storyboard.SetTarget(danim1, scaly); Storyboard.SetTargetProperty(danim1, new PropertyPath(ScaleTransform.ScaleXProperty)); Storyboard.SetTarget(danim2, scaly); Storyboard.SetTargetProperty(danim2, new PropertyPath(ScaleTransform.ScaleYProperty)); sb.Begin(); } Unfortunately, when I run this program, it does nothing. The rectangle stays at 144x144. If I do away with the animation, and just ScaleTransform scaly = new ScaleTransform(1.5, 0.5); rect1.RenderTransform = scaly; it will elongate it instantly, no problem. There is a problem elsewhere. Any suggestions? I have read the discussion at http://www.eggheadcafe.com/software/aspnet/29220878/how-to-animate-tofrom-an.aspx in which someone seems to have gotten a pure-XAML version working, but the code is not shown there. EDIT: At http://stackoverflow.com/questions/2131797/applying-animated-scaletransform-in-code-problem it seems someone had a very similar problem, I am fine with using his method that worked, but what the heck is that string thePath = "(0).(1)[0].(2)"; all about? What are those numbers representing?

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  • Binding Image.Source to String in WPF ?

    - by Mohammad
    I have below XAML code : <Window x:Class="WpfApplication1.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" DataContext="{Binding RelativeSource={RelativeSource Self}}" WindowStartupLocation="CenterScreen" Title="Window1" Height="300" Width="300"> <Grid> <Image x:Name="TestImage" Source="{Binding Path=ImageSource}" /> </Grid> </Window> Also, there is a method that makes an Image from a Base64 string : Image Base64StringToImage(string base64ImageString) { try { byte[] b; b = Convert.FromBase64String(base64ImageString); MemoryStream ms = new System.IO.MemoryStream(b); System.Drawing.Image img = System.Drawing.Image.FromStream(ms); ////////////////////////////////////////////// //convert System.Drawing.Image to WPF image System.Drawing.Bitmap bmp = new System.Drawing.Bitmap(img); IntPtr hBitmap = bmp.GetHbitmap(); System.Windows.Media.ImageSource imageSource = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(hBitmap, IntPtr.Zero, Int32Rect.Empty, BitmapSizeOptions.FromEmptyOptions()); Image wpfImage = new Image(); wpfImage.Source = imageSource; wpfImage.Width = wpfImage.Height = 16; ////////////////////////////////////////////// return wpfImage; } catch { Image img1 = new Image(); img1.Source = new BitmapImage(new Uri(@"/passwordManager;component/images/TreeView/empty-bookmark.png", UriKind.Relative)); img1.Width = img1.Height = 16; return img1; } } Now, I'm gonna bind TestImage to the output of Base64StringToImage method. I've used the following way : public string ImageSource { get; set; } ImageSource = Base64StringToImage("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").Source.ToString(); but nothing happen. How can I fix it ? BTW, I'm dead sure that the base64 string is correct

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  • Split WPF Style XAML Files

    - by anon
    Most WPF styles I have seen are split up into one very long Theme.xaml file. I want to split mine up for readability so my Theme.xaml looks like this: <ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"> <ResourceDictionary.MergedDictionaries> <ResourceDictionary Source="/PresentationFramework.Aero;v3.0.0.0;31bf3856ad364e35;component/themes/aero.normalcolor.xaml"/> <ResourceDictionary Source="Controls/Brushes.xaml"/> <ResourceDictionary Source="Controls/Buttons.xaml"/> ... </ResourceDictionary.MergedDictionaries> </ResourceDictionary> The problem is that this solution does not work. I have a default button style which is BasedOn the default Aero style for a button: <Style x:Key="{x:Type Button}" TargetType="{x:Type Button}" BasedOn="{StaticResource {x:Type Button}}"> <Setter Property="FontSize" Value="14"/> ... </Style> If I place all of this in one file it works but as soon as I split it up I get StackOverflow exceptions because it thinks it is BasedOn itself. Is there a way around this? How does WPF add resources when merging resource dictionaries?

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  • WPF Control validation

    - by Jon
    Hi all, I'm developing a WPF GUI framework and have had bad experiences with two way binding and lots of un-needed events being fire(mainly in Flex) so I have gone down the route of having bindings (string that represent object paths) in my controls. When a view is requested to be displayed the controller loads the view, and gets the needed entities (using the bindings) from the DB and populates the controls with the correct values. This has a number of advantages i.e. lazy loading, default undo behaviour etc. When the data in the view needs to be saved the view is passed back to the controller again which basically does the reserve i.e. re-populates the entities from the view if values have changed. However, I have run into problems when I try and validate the components. Each entity has attributes on its properties that define validation rules which the controller can access easily and validate the data from the view against it. The actual validation of data is fine. The problem comes when I want the GUI control to display error validation information. It I try changing the style I get errors saying styles cannot be changed once in use. Is the a way in c# to fire off the normal WPF validation mechanism and just proved it with the validaiton errors the controller has found? Thanks in advance Jon

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  • WPF - Setting usercontrol width using triggers and mouseenter event

    - by BigBadJock
    I have a wrap panel full of usercontrols. When I hover the mouse over a usercontrol I want it to expand to show more details. Some stripped down sample code: <UserControl x:Class="WPFTestBed.UserControl1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Height="300" Width="300"> <UserControl.Resources> </UserControl.Resources> <UserControl.Triggers> <EventTrigger RoutedEvent="Mouse.MouseEnter"> <EventTrigger.Actions> <Setter TargetName="WPFTestBed.UserControl1" Property="Control.Width" Value="200"/> </EventTrigger.Actions> </EventTrigger> </UserControl.Triggers> <Grid Height="95" Width="123"> <Button Height="23" HorizontalAlignment="Left" Margin="17,30,0,0" Name="button1" VerticalAlignment="Top" Width="75">Button</Button> </Grid> </UserControl> I would appreciate it if someone could point out where I'm going wrong, and set me down the correct path. Ideally, I want the usercontrol to delay for x seconds when there is a mouseover, before expanding and showing the extra details.

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  • Automatic linebreak in WPF label

    - by Vlad
    Dear all, is it possible for a WPF Label to split itself automatically into several lines? In my following example, the text is cropped at the right. <Window x:Class="..." xmlns="..." xmlns:x="..." Height="300" Width="300"> <Grid> <Label> `_Twas brillig, and the slithy toves did gyre and gimble in the wabe: all mimsy were the borogoves, and the mome raths outgrabe.</Label> </Grid> </Window> Am I doing something wrong? Taking other controls is unfortunately not a good option, since I need support of access keys. Replacing the Label with a TextBlock (having TextWrapping="Wrap"), and adjusting its control template to recognize access keys would be perhaps a solution, but isn't it an overkill? Edit: having a non-standard style for label will break skinning, so I would like to avoid it if possible.

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  • WPF designer gives exception when databinding a label to a checkbox

    - by John
    I'm sure it's something stupid, but I'm playing around with databinding. I have a checkbox and a label on a form. What I'm trying to do is simply bind the Content of the label to the checkbox's IsChecked value. What I've done runs fine (no compilation errors and acts as expected), but if I touch the label in the XAML, the designer trows an exception: System.NullReferenceException Object reference not set to an instance of an object. at MS.Internal.Designer.PropertyEditing.Editors.MarkupExtensionInlineEditorControl.BuildBindingString(Boolean modeSupported, PropertyEntry propertyEntry) at <Window x:Class="UnitTestHelper.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:FileSysCtls="clr-namespace:WPFFileSystemUserControls;assembly=WPFFileSystemUserControls" xmlns:HelperClasses="clr-namespace:UnitTestHelper" Title="MainWindow" Height="406" Width="531"> <Window.Resources> <HelperClasses:ThreestateToBinary x:Key="CheckConverter" /> </Window.Resources> <Grid Height="367" Width="509"> <CheckBox Content="Step into subfolders" Height="16" HorizontalAlignment="Left" Margin="17,254,0,0" Name="chkSubfolders" VerticalAlignment="Top" Width="130" IsThreeState="False" /> <Label Height="28" HorizontalAlignment="Left" Margin="376,254,0,0" Name="lblStepResult" VerticalAlignment="Top" Width="120" IsEnabled="True" Content="{Binding IsChecked, ElementName=chkSubfolders, Mode=OneWay, UpdateSourceTrigger=PropertyChanged, Converter={StaticResource CheckConverter}}" /> </Grid> The ThreeStateToBinary class is as follows: class ThreestateToBinary : IValueConverter { #region IValueConverter Members public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { if ((bool)value) return "Checked"; else return "Not checked"; //throw new NotImplementedException(); } public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { return ((string)value == "Checked"); //throw new NotImplementedException(); } #endregion } Quite honestly, I'm playing around with it at this point. It was originally simpler (not using the ValueConverter) but was displaying similar behavior when I simply had the content set to: Content="{Binding IsChecked, ElementName=chkSubfolders, UpdateSourceTrigger=PropertyChanged}" Any ideas? Thanks, John

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  • General Question About WPF Control Behavior and using Invoke

    - by Phil Sandler
    I have been putting off activity on SO because my current reputation is "1337". :) This is a question of "why" and not "how". By default, it seems that WPF does not set focus to the first control in a window when it's opening. In addition, when a textbox gets focus, by default it does not have it's existing text selected. So basically when I open a window, I want focus on the first control of the window, and if that control is a textbox, I want it's existing text (if any) to be selected. I found some tips online to accomplish each of these behaviors, and combined them. The code below, which I placed in the constructor of my window, is what I came up with: Loaded += (sender, e) => { MoveFocus(new TraversalRequest(FocusNavigationDirection.Next)); var textBox = FocusManager.GetFocusedElement(this) as TextBox; if (textBox != null) { Action select = textBox.SelectAll; //for some reason this doesn't work without using invoke. Dispatcher.Invoke(DispatcherPriority.Loaded, select); } }; So, my question. Why does the above not work without using Dispatcher.Invoke? Is something built into the behavior of the window (or textbox) cause the selected text to be de-selected post-loading? Maybe related, maybe not--another example of where I had to use Dispatcher.Invoke to control the behavior of a form: http://stackoverflow.com/questions/2602979/wpf-focus-in-tab-control-content-when-new-tab-is-created

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  • Aliasing Resources (WPF)

    - by Noldorin
    I am trying to alias a resource in XAML, as follows: <UserControl.Resources> <StaticResourceExtension x:Key="newName" ResourceKey="oldName"/> </UserControl.Resources> oldName simply refers to a resource of type Image, defined in App.xaml. As far as I understand, this is the correct way to do this, and should work fine. However, the XAML code gives me the superbly unhelpful error: "The application XAML file failed to load. Fix errors in the application XAML before opening other XAML files." This appears when I hover over the StaticResourceExtension line in the code (which has a squiggly underline). Several other errors are generated in the actual Error List, but seem to be fairly irrelevant and nonsenical (such messages as "The name 'InitializeComponent' does not exist in the current context"), as they all disappear when the line is removed. I'm completely stumped here. Why is WPF complaining about this code? Any ideas as to a resolution please? Note: I'm using WPF in .NET 3.5 SP1. Update 1: I should clairfy that I do receive compiler errors (the aforementioned messages in the Error List), so it's not just a designer problem. Update 2: Here's the relevant code in full... In App.xaml (under Application.Resource): <Image x:Key="bulletArrowUp" Source="Images/Icons/bullet_arrow_up.png" Stretch="None"/> <Image x:Key="bulletArrowDown" Source="Images/Icons/bullet_arrow_down.png" Stretch="None"/> And in MyUserControl.xaml (under UserControl.Resources): <StaticResourceExtension x:Key="columnHeaderSortUpImage" ResourceKey="bulletArrowUp"/> <StaticResourceExtension x:Key="columnHeaderSortDownImage" ResourceKey="bulletArrowDown"/> These are the lines that generate the errors, of course.

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  • How to get the row and column of button clicked, in the grid event handler?

    - by younevertell
    Once the added button in grid is clicked, how to find which row and column the button is located in the grid event handler, like click event or some other events? Not the button click event handler #region Grid event handler setup myGrid.MouseEnter += new MouseEventHandler(myGrid_MouseEnter); myGrid.MouseLeave += new MouseEventHandler(myGrid_MouseLeave); myGrid.MouseDown += new MouseButtonEventHandler(myGrid_MouseDown); myGrid.MouseUp += new MouseButtonEventHandler(myGrid_MouseUp); #endregion Thanks I notice that Boyan has some solution for the button click event handler case http://stackoverflow.com/questions/363100/in-wpf-how-can-i-determine-what-column-row-in-a-grid-a-control-is In the Click event handler for the button you say: int row; Button btn = sender as Button; if (btn != null) { row = Grid.GetRow(btn); // And you have the row number... } else { // A nasty error occurred... }

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  • checkbox like radiobutton wpf c#

    - by rockenpeace
    i have investigated this problem but this is solved in design view and code-behind. but my problem is little difference: i try to do this as only code-behind because my checkboxes are dynamically created according to database data.In other words, number of my checkboxes is not stable. i want to check only one checkbox in group of checkboxes. when i clicked one checkbox,i want that ischecked property of other checkboxes become false.this is same property in radiobuttons. i take my checkboxes from a stackpanel in xaml side: <StackPanel Margin="4" Orientation="Vertical" Grid.Row="1" Grid.Column="1" Name="companiesContainer"> </StackPanel> my xaml.cs: using (var c = new RSPDbContext()) { var q = (from v in c.Companies select v).ToList(); foreach (var na in q) { CheckBox ch = new CheckBox(); ch.Content = na.Name; ch.Tag = na; companiesContainer.Children.Add(ch); } } foreach (object i in companiesContainer.Children) { CheckBox chk = (CheckBox)i; chk.SetBinding(ToggleButton.IsCheckedProperty, "DataItem.IsChecked"); } how can i provide this property in checkboxes in xaml.cs ? thanks in advance..

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  • WPF: TextBox expanding with surrounding Grid but not with text

    - by haagel
    I have a problem with a TextBox in an application... A window has a Grid with two columns. The left column contains a control with a constant width but with a height that adapts. The right column contains a TextBox that takes up all remaining space in the Grid (and thereby in the Window). The Grid is given a minimal width and height and is wrapped within a ScrollViewer. If the user resizes the window to be smaller than the minimal widht/height of the Grid, scrollbars are displayed. This is exactly how I want it to be. However, a problem occurs when the user starts typing text. If the text is to long to fit in one line in the TextBox, I want the text to wrap. Therefore I set TextWrapping="Wrap" on the TextBox. But since the TextBox has an automatic width and is wrapped in a ScrollViewer (its actually the whole Grid that is wrapped), the TextBox just keeps expanding to the right. I do want the TextBox to expand if the window is expanded, but I don't want the TextBox to expand by the text. Rather the text should wrap inside the available TextBox. If the text don't fit within the TextBox height, a scrollbar should be displayed within the TextBox. Is there a way to accomplish this? Below is some code that shows my problem. <Window x:Class="AdaptingTextBoxes.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MainWindow" Height="300" Width="400" Background="DarkCyan"> <Grid Margin="10" Name="LayoutRoot"> <ScrollViewer HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Auto"> <Grid MinWidth="300" MinHeight="200"> <Grid.ColumnDefinitions> <ColumnDefinition Width="auto" /> <ColumnDefinition Width="*" /> </Grid.ColumnDefinitions> <Button Grid.Column="0" Margin="0,0,10,0" Content="Button" Width="100" /> <TextBox Grid.Column="1" AcceptsReturn="True" TextWrapping="Wrap" ScrollViewer.HorizontalScrollBarVisibility="Disabled" ScrollViewer.VerticalScrollBarVisibility="Auto" /> </Grid> </ScrollViewer> </Grid> </Window>

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  • Change user control appearance based on state

    - by John
    I have a user control that consists of four overlapping items: 2 rectangles, an ellipse and a lable <UserControl x:Class="UserControl" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Width="50.1" Height="45.424" Background="Transparent" FontSize="24"> <Grid> <Grid.RowDefinitions> <RowDefinition Height="3.303*" /> <RowDefinition Height="40*" /> <RowDefinition Height="2.121*" /> </Grid.RowDefinitions> <Grid.ColumnDefinitions> <ColumnDefinition Width="5.344*" /> <ColumnDefinition Width="40.075*" /> <ColumnDefinition Width="4.663*" /> </Grid.ColumnDefinitions> <Rectangle Name="Rectangle1" RadiusX="5" RadiusY="5" Fill="DarkGray" Grid.ColumnSpan="3" Grid.RowSpan="3" /> <Ellipse Name="ellipse1" Fill="{Binding State}" Margin="0.016,0.001,4.663,0" Grid.Row="1" Grid.Column="1" Grid.ColumnSpan="2" Stroke="Black" IsEnabled="True" Panel.ZIndex="2" /> <Label Name="lblNumber" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" Foreground="White" FontWeight="Bold" FontSize="24" Grid.Column="1" Grid.Row="1" Padding="0" Panel.ZIndex="3">9</Label> <Rectangle Grid.Column="1" Grid.Row="1" Margin="0.091,0,4.663,0" Fill="Blue" Name="rectangle2" Stroke="Black" Grid.ColumnSpan="2" Panel.ZIndex="1" /> </Grid> Here is my business object that I want to control the state of my user control: Imports System.Data Imports System.ComponentModel Public Class BusinessObject Implements INotifyPropertyChanged 'Public logger As log4net.ILog Public Event PropertyChanged As PropertyChangedEventHandler Implements INotifyPropertyChanged.PropertyChanged Private _state As States Public Enum States State1 State2 State3 End Enum Public Property State() As States Get Return _state End Get Set(ByVal value As States) If (value <> _state) Then _state = value RaiseEvent PropertyChanged(Me, New PropertyChangedEventArgs("State")) End If End Set End Property Protected Sub OnPropertyChanged(ByVal name As String) RaiseEvent PropertyChanged(Me, New PropertyChangedEventArgs(name)) End Sub I want to be able to change the state of a business object in the code behind and have that change the colors of multiple shapes in my usercontrol. I'm not sure about how to do the binding. I set the datacontext of the user control in the code behind but not sure if that's right. I'm new to WPF and programming in general and I'm stuck on where to go from here. Any recommendations would be greatly appreciated!!

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  • WPF vs. WinForms - a Delphi programmer's perspective?

    - by Robert Oschler
    I have read most of the major threads on WPF vs. WinForms and I find myself stuck in the unfortunate ambivalence you can fall into when deciding between the tried and true previous tech (Winforms), and it's successor (WPF). I am a veteran Delphi programmer of many years that is finally making the jump to C#. My fellow Delphi programmers out there will understand that I am excited to know that Anders Hejlsberg, of Delphi fame, was the architect behind C#. I have a strong addiction to Delphi's VCL custom components, especially those involved in making multi-step Wizards and components that act as a container for child components. With that background, I am hoping that those of you that switched from Delphi to C# can help me with my WinForms vs. WPF decision for writing my initial applications. Note, I am very impatient when coding and things like full fledged auto-complete and proper debugger support can make or break a project for me, including being able to find readily available information on API features and calls and even more so, workarounds for bugs. The SO threads and comments in the early 2009 date range give me great concern over WPF when it comes to potential frustrations that could mar my C# UI development coding. On the other hand, spending an inordinate amount of time learning an API tech that is, even if it is not abandoned, soon to be replaced (WinForms), is equally troubling and I do find the GPU support in WPF tantalizing. Hence my ambivalence. Since I haven't learned either tech yet I have a rare opportunity to get a fresh start and not have to face the big "unlearning" curve I've seen people mention in various threads when a WinForms programmer makes the move to WPF. On the other hand, if using WPF will just be too frustrating or have other major negative consequences for an impatient RAD developer like myself, then I'll just stick with WinForms until WPF reaches the same level of support and ease of use. To give you a concrete example into my psychology as a programmer, I used VB and subsequently Delphi to completely avoid altogether the very real pain of coding with MFC, a Windows UI library that many developers suffered through while developing early Windows apps. I have never regretted my luck in avoiding MFC. It would also be comforting to know if Anders Hejlsberg had a hand in the architecture of WPF and/or WinForms, and if there are any disparities in the creative vision and ease of use embodied in either code base. Finally, for the Delphi programmers again, let me know how much "IDE schock" I'm in for when using WPF as opposed to WinForms, especially when it comes to debugger support. Any job market comments updated for 2011 would be appreciated too. -- roschler

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  • WPF vs. WinForms - a Delphi programmer's perspective?

    - by Robert Oschler
    Hello all. I have read most of the major threads on WPF vs. WinForms and I find myself stuck in the unfortunate ambivalence you can fall into when deciding between the tried and true previous tech (Winforms), and it's successor (WPF). I am a veteran Delphi programmer of many years that is finally making the jump to C#. My fellow Delphi programmers out there will understand that I am excited to know that Anders Hejlsberg, of Delphi fame, was the architect behind C#. I have a strong addiction to Delphi's VCL custom components, especially those involved in making multi-step Wizards and components that act as a container for child components. With that background, I am hoping that those of you that switched from Delphi to C# can help me with my WinForms vs. WPF decision for writing my initial applications. Note, I am very impatient when coding and things like full fledged auto-complete and proper debugger support can make or break a project for me, including being able to find readily available information on API features and calls and even more so, workarounds for bugs. The SO threads and comments in the early 2009 date range give me great concern over WPF when it comes to potential frustrations that could mar my C# UI development coding. On the other hand, spending an inordinate amount of time learning an API tech that is, even if it is not abandoned, soon to be replaced (WinForms), is equally troubling and I do find the GPU support in WPF tantalizing. Hence my ambivalence. Since I haven't learned either tech yet I have a rare opportunity to get a fresh start and not have to face the big "unlearning" curve I've seen people mention in various threads when a WinForms programmer makes the move to WPF. On the other hand, if using WPF will just be too frustrating or have other major negative consequences for an impatient RAD developer like myself, then I'll just stick with WinForms until WPF reaches the same level of support and ease of use. To give you a concrete example into my psychology as a programmer, I used VB and subsequently Delphi to completely avoid altogether the very real pain of coding with MFC, a Windows UI library that many developers suffered through while developing early Windows apps. I have never regretted my luck in avoiding MFC. It would also be comforting to know if Anders Hejlsberg had a hand in the architecture of WPF and/or WinForms, and if there are any disparities in the creative vision and ease of use embodied in either code base. Finally, for the Delphi programmers again, let me know how much "IDE schock" I'm in for when using WPF as opposed to WinForms, especially when it comes to debugger support. Any job market comments updated for 2011 would be appreciated too. -- roschler

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  • Detecting Idle Time with Global Mouse and Keyboard Hooks in WPF

    - by jdanforth
    Years and years ago I wrote this blog post about detecting if the user was idle or active at the keyboard (and mouse) using a global hook. Well that code was for .NET 2.0 and Windows Forms and for some reason I wanted to try the same in WPF and noticed that a few things around the keyboard and mouse hooks didn’t work as expected in the WPF environment. So I had to change a few things and here’s the code for it, working in .NET 4. I took the liberty and refactored a few things while at it and here’s the code now. I’m sure I will need it in the far future as well. using System; using System.Diagnostics; using System.Runtime.InteropServices; namespace Irm.Tim.Snapper.Util { public class ClientIdleHandler : IDisposable { public bool IsActive { get; set; } int _hHookKbd; int _hHookMouse; public delegate int HookProc(int nCode, IntPtr wParam, IntPtr lParam); public event HookProc MouseHookProcedure; public event HookProc KbdHookProcedure; //Use this function to install thread-specific hook. [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)] public static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId); //Call this function to uninstall the hook. [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)] public static extern bool UnhookWindowsHookEx(int idHook); //Use this function to pass the hook information to next hook procedure in chain. [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)] public static extern int CallNextHookEx(int idHook, int nCode, IntPtr wParam, IntPtr lParam); //Use this hook to get the module handle, needed for WPF environment [DllImport("kernel32.dll", CharSet = CharSet.Auto)] public static extern IntPtr GetModuleHandle(string lpModuleName); public enum HookType : int { GlobalKeyboard = 13, GlobalMouse = 14 } public int MouseHookProc(int nCode, IntPtr wParam, IntPtr lParam) { //user is active, at least with the mouse IsActive = true; Debug.Print("Mouse active"); //just return the next hook return CallNextHookEx(_hHookMouse, nCode, wParam, lParam); } public int KbdHookProc(int nCode, IntPtr wParam, IntPtr lParam) { //user is active, at least with the keyboard IsActive = true; Debug.Print("Keyboard active"); //just return the next hook return CallNextHookEx(_hHookKbd, nCode, wParam, lParam); } public void Start() { using (var currentProcess = Process.GetCurrentProcess()) using (var mainModule = currentProcess.MainModule) { if (_hHookMouse == 0) { // Create an instance of HookProc. MouseHookProcedure = new HookProc(MouseHookProc); // Create an instance of HookProc. KbdHookProcedure = new HookProc(KbdHookProc); //register a global hook _hHookMouse = SetWindowsHookEx((int)HookType.GlobalMouse, MouseHookProcedure, GetModuleHandle(mainModule.ModuleName), 0); if (_hHookMouse == 0) { Close(); throw new ApplicationException("SetWindowsHookEx() failed for the mouse"); } } if (_hHookKbd == 0) { //register a global hook _hHookKbd = SetWindowsHookEx((int)HookType.GlobalKeyboard, KbdHookProcedure, GetModuleHandle(mainModule.ModuleName), 0); if (_hHookKbd == 0) { Close(); throw new ApplicationException("SetWindowsHookEx() failed for the keyboard"); } } } } public void Close() { if (_hHookMouse != 0) { bool ret = UnhookWindowsHookEx(_hHookMouse); if (ret == false) { throw new ApplicationException("UnhookWindowsHookEx() failed for the mouse"); } _hHookMouse = 0; } if (_hHookKbd != 0) { bool ret = UnhookWindowsHookEx(_hHookKbd); if (ret == false) { throw new ApplicationException("UnhookWindowsHookEx() failed for the keyboard"); } _hHookKbd = 0; } } #region IDisposable Members public void Dispose() { if (_hHookMouse != 0 || _hHookKbd != 0) Close(); } #endregion } } The way you use it is quite simple, for example in a WPF application with a simple Window and a TextBlock: <Window x:Class="WpfApplication2.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MainWindow" Height="350" Width="525"> <Grid> <TextBlock Name="IdleTextBox"/> </Grid> </Window> And in the code behind we wire up the ClientIdleHandler and a DispatcherTimer that ticks every second: public partial class MainWindow : Window { private DispatcherTimer _dispatcherTimer; private ClientIdleHandler _clientIdleHandler; public MainWindow() { InitializeComponent(); } private void Window_Loaded(object sender, RoutedEventArgs e) { //start client idle hook _clientIdleHandler = new ClientIdleHandler(); _clientIdleHandler.Start(); //start timer _dispatcherTimer = new DispatcherTimer(); _dispatcherTimer.Tick += TimerTick; _dispatcherTimer.Interval = new TimeSpan(0, 0, 0, 1); _dispatcherTimer.Start(); } private void TimerTick(object sender, EventArgs e) { if (_clientIdleHandler.IsActive) { IdleTextBox.Text = "Active"; //reset IsActive flag _clientIdleHandler.IsActive = false; } else IdleTextBox.Text = "Idle"; } } Remember to reset the ClientIdleHandle IsActive flag after a check.

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  • ASP.Net or WPF(C#)?

    - by Rachel
    Our team is divided on this and I wanted to get some third-party opinions. We are building an application and cannot decide if we want to use .Net WPF Desktop Application with a WCF server, or ASP.Net web app using jQuery. I thought I'd ask the question here, with some specs, and see what the pros/cons of using either side would be. I have my own favorite and feel I am biased. Ideally we want to build the initial release of the software as fast as we can, then slow down and take time to build in the additional features/components we want later on. Above all we want the software to be fast. Users go through records all day long and delays in loading records or refreshing screens kills their productivity. Application Details: I'm estimating around 100 different screens for initial version, with plans for a lot of additional screens being added on later after the initial release. We are looking to use two-way communication for reminder and event systems Currently has to support around 100 users, although we've been told to allow for growth up to 500 users We have multiple locations Items to consider (maybe not initially in some cases but in future releases): Room for additional components to be added after initial release (there are a lot of of these... perhaps work here than the initial application) Keyboard navigation Performance is a must Production Speed to initial version Low maintenance overhead Future support Softphone/Scanner integration Our Developers: We have 1 programmer who has been learning WPF the past few months and was the one who suggested we use WPF for this. We have a 2nd programmer who is familiar with ASP.Net and who may help with the project in the future, although he will not be working on it much up until the initial release since his time is spent maintaining our current software. There is me, who has worked with both and am comfortable in either We have an outside company doing the project management, and they are an ASP.Net company. We plan on hiring 1-2 others, however we need to know what direction we are going in first Environment: General users are on Windows 2003 server with Terminal Services. They connect using WYSE thin-clients over an RDP connection. Admin staff has their own PCs with XP or higher. Users are allowed to specify their own resolution although they are limited to using IE as the web browser. Other locations connects to our network over a MPLS connection Based on that, what would you choose and why? I am asking here instead of SO because I am looking for opinions and not answers

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