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  • wpf: usercontrol vs. customcontrol performance issue

    - by viky
    Which one is better from performance view user control or custom control? Right now I am using user control and In a specific scenario, I am creating around 200(approx.) different instances of this control but it is bit slow while loading and I need to wait atlest 20-30 second to complete the operation. What should I do to increase the performance?

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  • WPF Animation Duration

    - by Allen Ho
    I have a storyboard like the following Duration="0:0:1" Completed="DeviceExplorer_Completed" The animation for some reason does not appear to be working linearly. If I change the duration to something like Duration="0:0:0.8" and assign the stroyboard to a MouseEnter event of a button, the animation moves but does not complete for some reason, I move my mouse over the button a few times before it enetually completes... Any ideas why?

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  • WPF image cropping

    - by Califer
    I'm loading layers of images to make a single image. I'm currently stacking them all onto a canvas. I've got it set up so the user can specify the final dimensions of the single image, but even when I change the size of the canvas the images retain their original sizes. I tried to modify the image size as I was loading them in, but the sizes were NaN and the Actual Sizes were 0 so I couldn't change them there. I'm starting to think that canvas might not be the way to go. Any suggestions to how I could clip images to fit a specific size? canvas1.Children.Clear(); int totalImages = Window1.GetNumberOfImages(); if (drawBackground) canvas1.Background = new SolidColorBrush(Color.FromArgb(a,r,g,b)); else canvas1.Background = new SolidColorBrush(Color.FromArgb(0, 0, 0, 0)); for (int i = 0; i < totalImages; i++) { Image image = new Image(); image.Source = Window1.GetNextImage(i); canvas1.Children.Add(image); }

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  • WPF/C#: Enable/Disable buttons depending on the number of clicks

    - by eibhrum
    Hi, I do have two buttons 'btnPrev' and 'btnNext' What I want to do is to be able to determine the number of clicks of the button so that I could enable and disable them. The process is almost similar to 'paging' method. Initial state: btnPrev - disabled, btnNext - enabled 1st Click (btnNext): btnPrev - enabled, btnNext - enabled 2nd Click (btnNext): btnPrev - enabled, btnNext - enabled 3rd Click (btnNext): btnPrev - enabled, btnNext - disabled the idea is almost the same vice-versa (for btnPrev) any suggestions how to do it?

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  • disable event-bubbling c# wpf

    - by Ruben
    Hi, I'm having the following problem: When I got two labels into each other: <Label x:Name="First" MouseUp="Label_MouseUp"> <Label x:Name="Second" MouseUp="Label_MouseUp_1">This is a label into another label</Label> </Label> And the following code: private void Label_MouseUp(object sender, MouseButtonEventArgs e) { Console.WriteLine("Do NOT show me"); } private void Label_MouseUp_1(object sender, MouseButtonEventArgs e) { Console.WriteLine("Show me"); } When i click "Second", I want it to trigger only "Label_MouseUp_1". But in my console i get: Show me Do NOT show me Is there a way to turn off the bubbling events? (also, "First" has to be clickable, so removing the event there doesn't solve the problem) Thnx

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  • Is WPF Decorator class useful?

    - by darja
    I need to create control to draw border around its child. So, I have created class and derived it from Decorator: class RoundedBoxDecorator : Decorator { protected override Size ArrangeOverride(Size arrangeSize) { //some source } protected override void OnRender(DrawingContext dc) { //some source } } It works fine, but I have some doubts about using Decorator as ancestor. I have found in MSDN that there are no special methods or properties in it, only derived from its ancestors (UIElement or FrameworkElement). ArrangeOverride and OnRender are also derived. So, what for Decorator class was designed and does it makes sense to use it? Or I can derive from FrameworkElement?

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  • WPF Editable Combobox IsFocused problem

    - by Rey
    I am developing a Watermarked Combobox by modifying Combobox Control template. everything is fine when combo box is not in editable mode. but when i change edit mode to True, isFocused property never set to True. this is because in edit mode, combo box is using a Text Box. This is exact copy of this StackOverflow question: . there are no responces to that question. please drop a line if you know how to solve this. or please point me to links that provide Watermark Combobox implementation. Thanks, Rey.

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  • WPF: KeyboardNavigationMode.Contained doesn't work to suppress focus wrap

    - by codymanix
    I want to navigate in my window with the arrow key. It works so far but if I reach the end of my window, focus wraps to the first main menu item. But I want that focus stops at the last control in my window. private void Window_PreviewKeyDown(object sender, KeyEventArgs e) { if (e.Key == Key.Down) { elem.MoveFocus(FocusNavigationDirection.Next); } } "elem" is indirect child control of "stackPanel". MoveFocus always returns true and I already tried: KeyboardNavigation.SetTabNavigation(stackPanel, KeyboardNavigationMode.Contained); KeyboardNavigation.SetDirectionalNavigation(stackPanel,KeyboardNavigationMode.Contained); KeyboardNavigation.SetControlTabNavigation(stackPanel, KeyboardNavigationMode.Contained); Nothing helped.

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  • Mouse interaction in ListBoxItem children (WPF)

    - by absence
    I have a ListBox with an ItemTemplate that contains a control that interacts with the mouse. This interfers with the selection functionality of the ListBox, i.e. clicking a control does not select the item. This is because ListBoxItem sets the Handled property of the mouse event to true in OnMouseLeftButtonDown. I tried the following protected override void OnMouseLeftButtonDown(MouseButtonEventArgs e) { base.OnMouseLeftButtonDown(e); e.Handled = false; } but the ListBoxItem “takes over” the mouse and prevents the control from doing its own interaction. Then I had another idea protected override void OnMouseLeftButtonDown(MouseButtonEventArgs e) { base.OnMouseLeftButtonDown(e); ((ListBoxItem)VisualTreeHelper.GetParent(VisualTreeHelper.GetParent(VisualTreeHelper.GetParent(this)))).IsSelected = true; } which actually works, but feels more like an ugly kludge than an elegant solution. Are there any better solutions that don't rely on the exact contents of the visual tree?

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  • WPF: When is a WrapPanel full.

    - by rathkopf
    I'm using a WrapPanel to display variable height items in columns. The wrappanel has a constrained size. Is there an way to determine when the WrapPanel is 'full'? I will then page to another panel with an animation. I've looked at the ArrangeOverride of the items that are the panels children, but they always seem to be getting all the space they want. I need a way to determine when they begin getting clipped.

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  • Progressbar with control template and its MouseDown event wpf

    - by Geetha
    Hi All, I am using a progress bar for the media element. i want to trigger Mousedown event for progress bar. Thai event is getting triggered only if i click on the border not in the middle(rectangle area to fill color) Code: <ControlTemplate x:Key="ratingBarTemplate" TargetType="{x:Type ProgressBar}"> <Border Name="PART_Track" Width="{TemplateBinding Width}" BorderBrush="Red" BorderThickness="2" > <Rectangle Name="PART_Indicator" Fill="Green" Height="{TemplateBinding Height}" FlowDirection="LeftToRight" HorizontalAlignment="Left"/> </Border> </ControlTemplate> <ProgressBar Name="probar" Minimum="0" Height="10" MouseDown="probar_MouseDown" BorderThickness="1" Template="{StaticResource ratingBarTemplate}" FlowDirection="LeftToRight"></ProgressBar> Geetha.

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  • WPF ListBox's scrollviewer customizable so that there is no Scrollbar, only RepeatButtons

    - by John
    Hi I would like to customize the scrollbars of a listbox's scrollviewer in such a way that the scrollbar only consists of a RepeatButton for scrolling up and a Repeatbutton for scrolling down. Nothing else. There should be no scrollbar (track) between the buttons. One button should be to the left of the ItemsPanel (scroll up) and the other on the right of the ItemsPanel. Is that possible?

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  • WPF Writing custom Control

    - by Petoj
    I wanted to write a Custom Control that would show a family tree... so i looked on FamilyShow.... So their control inherits FrameworkElement but then every thing gets super complex... are there any easy tutorials out there that show how to implement a custom FrameworkElement with children and so on? Basically what i fail to do is this, Add child controls and show them, and when drawing getting the coordinates of the child controls...

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  • WPF WriteableBitmap

    - by Sam
    I'm using WriteableBitmap on an image of type Bgra32 to change the pixel value of certain pixels. I'm setting the value to 0x77CCCCCC. After calling WritePixels, the pixels I set to 0x77CCCCCC show up with a value of 0x77FFFFFF. Why does this happen? How do I make the pixels have the correct value?

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  • WPF Menu Items Styles

    - by Allen Ho
    Hi, I have an application resource of the following <Style TargetType="{x:Type TextBlock}"> <Setter Property="Background" Value="{DynamicResource windowTextBackColor}"/> <Setter Property="Foreground" Value="{DynamicResource windowsTextForeColor}"/> </Style> So all the text blocks in my application should assume those colours. However the Menu and its containing MenuItems on my Main Window does not take these colours? I have to do the XAML for it to assume those colours, Is there a reason why setting a style that targets Text blocks does not work? Thanks

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  • WPF Textbox & Borders - curious resizing behavior

    - by CitizenParker
    The following XAML produces a window with strange behavior around the textbox: <Window x:Class="WpfSandbox.CuriousExample" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="CuriousExample" Height="300" Width="300"> <DockPanel Margin="15"> <TextBox BorderThickness="1" BorderBrush="#FF000000"></TextBox> </DockPanel> </Window> What happens, at least during my limited testing, is that the textbox renders with an inset border pattern (top/left is black, right/bottom is grey). However, when you resize to any position except the original, the entire textbox border goes to black. Whenever you return the window to the exact number of on-screen pixels the form had when it first loaded, it's inset again. I'm guessing it isn't pixel snapping as I can easily correct the problem with this code: <Window x:Class="WpfSandbox.CuriousExample" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="CuriousExample" Height="300" Width="300"> <DockPanel Margin="15"> <Border BorderThickness="1" BorderBrush="#FF000000"> <TextBox BorderThickness="0" ></TextBox> </Border> </DockPanel> </Window> Anyone care to venture an explanation as to what I'm seeing? Or is it all in my head? Like I said, the above workaround can resolve this problem - just trying to understand what is happening here. Thanks, -Scott

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  • Implementing a Property Inspector/Editor in WPF

    - by Schneider
    So far my plan is to have an event "Item selected" which the property inspector listens to. The actual property inspector is just a ContentControl. When the object is selected the content property is set and the appropriate DataTemplate for editing the object is loaded. In general I am trying to do this "MVVM" style. I guess you could use reflection instead of templating but I only have a handful of types so far. Has anyone implemented something similar? Can you offer any advice or source code?

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  • WPF: Invert OpacityMask

    - by Meleak
    Consider the following piece of Xaml <Grid Background="Blue"> <Border Width="100" Height="60" BorderBrush="Black" BorderThickness="2"> <Border Background="Red"> <Border.OpacityMask> <VisualBrush> <VisualBrush.Visual> <TextBlock Text="Text" Foreground="#FF000000" Background="#00000000"/> </VisualBrush.Visual> </VisualBrush> </Border.OpacityMask> </Border> </Border> </Grid> It will look like this because of the OpacityMask whos only non-transparent part is the Foreground of the TextBlock. Now if I switch the Colors for Foreground and Background in the TextBlock like this <TextBlock Text="Text" Foreground="#00000000" Background="#FF000000"/> I get this because the even though the Foreground is transparent the Background behind it is not, resulting in a useless OpacityMask :) Is there anyway I can get this? Basically an inverted OpacityMask The reason I'm asking this is because of the answer I made in this question, using the approach from this link. Even though it works, it feels very "hacky". Am I missing some other way to do this here? Update To clarify, even though my example is about a TextBlock, it could be anything. Ellipse/Image/Path etc. The feature I'm after is "Invert OpacityMask"

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  • wpf manually generate TreeViewItem container

    - by viky
    I am creating a TreeView at runtime. It has several nodes(TreeViewItem), each one having a name. Initially it is collapsed. A separate comboBox displays Names of all TreeViewItem. I have to highlight a TreeViewItem based on the Name selected. I am using a recursive function and gets the TreeViewItem container like this: if (parent.ItemContainerGenerator.Status != GeneratorStatus.ContainersGenerated) continue; TreeViewItem container = parent.ItemContainerGenerator.ContainerFromItem(child).As<TreeViewItem>(); but it is parent.ItemContainerGenerator.Status = GeneratorStatus.NotStarted for all the collapsed items. How can I generate containers for them manually(Without expanding them)?

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  • WPF Best point to udpate a progress bar from backgorundworker

    - by toni
    Hi! I have a task that takes a long time executing. In order to inform about the progress to the user I have a progress bar that I update inside DoWork but I would like anybody tells me if it is the best way to update the progress bar. I have heard that there is a reportprogress event handler but I am confused because I don't know what is the utility of the ReportProgress. Thanks.

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  • wpf: design time error while writing Nested type in xaml

    - by viky
    I have created a usercontrol which accept type of enum and assign the values of that enum to a ComboBox control in that usercontrol. Very Simple. I am using this user control in DataTemplates. Problem comes when there comes nested type. I assign that using this notation EnumType="{x:Type myNamespace:ParentType + NestedType}" It works fine at runtime. but at design time it throws error saying Could not create an instance of type 'TypeExtension' Why? Due to this I am not able to see my window at design time. Any help?

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  • Enable/Disable WPF buttons depending on the number of clicks

    - by eibhrum
    I have two buttons 'btnPrev' and 'btnNext' What I want to do is to be able to determine the number of clicks of the button so that I could enable and disable them. The process is almost similar to 'paging' method. Initial state: btnPrev - disabled, btnNext - enabled 1st Click (btnNext): btnPrev - enabled, btnNext - enabled 2nd Click (btnNext): btnPrev - enabled, btnNext - enabled 3rd Click (btnNext): btnPrev - enabled, btnNext - disabled the idea is almost the same vice-versa (for btnPrev).

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  • Fill WPF listbox with string array

    - by Archie
    Instead of adding each item one by one to the ListBox destinationList from the string array m_List like this: foreach (object name in m_List) { destinationList.Items.Add((string)name); } Is there any better way I can do it? I don't want to bind the data to the destinationList since I want to delete some entries from the ListBox later on.

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  • WPF/MVVM: Delegating a domain Model collection to a ViewModel

    - by msfanboy
    A domain model collection (normally a List or IEnumerable) is delegated to a ViewModel. Thats means my CustomerViewModel has a order collection of type List or IEnumerable. No change in the list is recognized by the bound control. But with ObservableCollection it is. This is a problem in the MVVM design pattern. How do you cope with it?

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