I'm tryig to use TabControl in Caliburn micro WPF project. I have two ViewModels (userControls) and I want the user to switch between them using tabcontrol.
I tried two different approaches, but I get the same problem with both of them.
After switching tabs (I click on second tab and then back on first), my application starts visibly lagging. For example if I click on a checkbox there is a visible delay.
It is the same problem as in this question: TabControl becoming very laggy, difference is that I am using caliburn micro and I am not sure that ListBox would be appropriate in my situation.
I tried implementing it this way:
<TabControl>
<TabItem Header="Item1">
<ContentControl
x:Name="Item1"/>
</TabItem>
<TabItem Header="Item2">
<ContentControl
x:Name="Item2"/>
</TabItem>
</TabControl>
I also tried using Conductor.Collection.OneActive:
this.Items.Add(Item1);
this.Items.Add(Item2);
XAML:
<TabControl Name="Items"/>
Everything works fine, it loads fast, tab switching is fast. The only problem is that rendering performance is really bad.
Any help would be appreciated.
Related
I'm using an MVVM pattern for my WPF application. If the "home" view model, which controls the layout of my application's main window, I have a ChildViewModel property. This holds a viewmodel that can be switched according to what the user is doing. When they select menu items, the child view model switches and the main area of the screen (it's in an Outlook style) switches accordingly.
I do this with a ContentControl and DataTemplate like this: (I'm only showing one of the embeddable views here to keep it short).
<ContentControl Grid.Row="1" Grid.Column="1" Margin="3"
Content="{Binding ChildViewModel}">
<ContentControl.Resources>
<DataTemplate DataType="{x:Type vm:VersionsViewModel}">
<Embeddable:VersionsView />
</DataTemplate>
</ContentControl.Resources>
</ContentControl>
I also want to add a ribbon to my main window, using the Telerik RadRibbonView control. I want this to have some fixed tabs and buttons that are always visible. In addition, I want to add and remove entire tabs, and buttons within existing tabs, according to the type of child view model. I'd like this to be done in the view in a similar manner to the way I've done the content control, above.
Is this possible? I've tried lots of things but got nowhere so far. I know I could do it by creating a huge "super ribbon" and binding visibility properties but this seems cludgey. I could also have multiple ribbons, each containing the common controls, but this would cause a maintenance problem.
In the end I went with the "super ribbon" approach, as I couldn't find any other way.
The project I am working on generates a series of tabs for each item opened by the user. For some tabs in particular, certain database hits and calculations take an extended period of time. I was trying to determine a simple way to alert the user when the tab is ready and figured a progress bar would be as good or better than other ways I considered.
I am wondering if there is a way to embed a progress bar behind the header text of a TabItem or if I will need to build my own CustomControl. I have no clue how to do either, however, I think some examples of the latter exist in the project so I could try to figure that out through them.
You can define the layout of a TabItem pretty easily. This snippet of XAML will create a TabControl with one TabItem where the header of the TabItem has a ProgressBar with a TextBlock over the ProgressBar.
Of course, please customize this XAML to actually make it look good :-D
<TabControl>
<TabItem>
<TabItem.Header>
<Grid>
<ProgressBar Width="100" />
<TextBlock Text="Some Tab"/>
</Grid>
</TabItem.Header>
</TabItem>
</TabControl>
I have an already made WPF application which is Windowed based and now I wish to implement tabbed controls instead of each of those separate windows. What would be the easiest and fastest way to reuse?
Thanks
Typically when I want to convert, I take the contents of each Window (which is usually wrapped in a Grid) and I convert them to a UserControl. You can basically move the entire Xaml and code-behind almost as-is, with only minor tweaks.
You then replace your Window contents with the UserControl, and you can reuse the same UserControl in a tab, or anywhere else.
Or you could convert you Windows to Pages and create frames in the tabs and put the page in the frame. It might be easier convert you Windows to Pages (and it might not) - depends on your Windows. I like the UserControl answer. Just putting another possilble option out there.
<TabItem>
<TabItem.Header>
<TextBlock Style="{StaticResource TabItemHeader}">DocTxt</TextBlock>
</TabItem.Header>
<Frame Source="PageViewDocText.xaml" BorderThickness="0" Margin="0"/>
</TabItem>
Transfort all your windows into UserControl and build your new window with your TabControl.
I'm using the Cinch MVVM framework, however I think this is something that relates to all WPF approaches.
I want to have a primary screen - Shell or MainWindow - which then contains various viewmodels. To navigate between viewmodels I'm using (or going to use) a tab control styled as a button strip with the content area beneath - which is all ok as I add the viewmodels to the tabcontrol (well to the 'Views' collection which is bound to the tab control) at runtime.
A screen that doesn't fit into this methodology is the sign in screen, which I don't really want to add to the tab control - preferably it should be in it's own usercontrol which takes up the entire screen apart from covering the logo; that is, I would like it to appear in the same window rather than a popup dialog, however I'm not sure how to add/ remove controls dynamically and then add subsequent tabcontrol once the user has signed in successfully (and remove the sign in screen). What containers should be used?
TIA.
The easiest way is put your tabcontrol in a Grid without columns and rows so it fill the grid by default. Then add an extra grid or loginusercontrol to the grid as shown below. The moment a user needs to login you can set the visibility of the MainTabControl" to collapsed and of the LoginGrid to Visible and switch it back after a succesfull login. I hope that the xaml below will help you enough.
<Grid>
<TabControl x:Name="MainTabControl" Visiblity="Visible">
... put your tabs here ...
</TabControl>
<Grid x:Name="LoginGrid" Background="#60FFFFFF" Visibility="Collapsed">
... put your usercontrol to login here or the login controls themself
</Grid>
</Grid>
You could use a ContentControl with content bound to a view model. So you'd have two view-models representing the sign-in screen and the main screen and use DataTemplate to display appropriate screen.
<Window.Resources>
...
<DataTemplate DataType="{x:Type my_view_models:SignInViewModel}">
<my_controls:SignInScreenView />
</DataTemplate>
...
</Window.Resources>
<ContentControl Content={Binding} />
You may be interested by Lakana, it is a lightweight and non intrusive navigation framework for WPF.
Riana
In Windows Forms the default behaviour of a TabControl is to have the tabs spill out to a scrollable area if they consume too much space (MultiLine = false).
What is the best approach to achieving this behavior in WPF?
UPDATE
I was trying to find a solution using TabControl.ItemsPanel but it seems anything I put in there gets completely ignored, so for this reason I've gone the hard way and started with TabControl.Template which is mind boggling that we have to do it this way if it turns out to be the correct approach.
Extremely far from being complete, my starting solution to the problem is as follows.
<TabControl>
<TabControl.Template>
<ControlTemplate TargetType="{x:Type TabControl}">
<DockPanel>
<ScrollViewer DockPanel.Dock="Top"
HorizontalScrollBarVisibility="Auto"
VerticalScrollBarVisibility="Disabled">
<StackPanel Orientation="Horizontal" IsItemsHost="True" />
</ScrollViewer>
<ContentPresenter ContentSource="SelectedContent" />
</DockPanel>
</ControlTemplate>
</TabControl.Template>
<TabItem Header="One">First</TabItem>
<TabItem Header="Two">Second</TabItem>
<TabItem Header="Three">Third</TabItem>
<TabItem Header="Four">Fourth</TabItem>
<TabItem Header="Five">Fifth</TabItem>
</TabControl>
In working to make a TabControl where the tabs are stacked vertically along the left, I found this solution for you:
http://www.blogs.intuidev.com/post/2010/02/10/TabControlStyling_PartThree.aspx
Pretty impressive stuff!
Your solution to replace the template seems to be the best way to do this. The default panel for the TabItems is a TabPanel, and I don't see anything like a "should wrap" property on it.
The documentation contains an example of replacing the TabControl template with a different TabPanel:
http://msdn.microsoft.com/en-us/library/system.windows.controls.primitives.tabpanel.aspx
i had the same problem few years ago, my solution was to limit the size of the header, and the panel that contains it, of course you need to make your own template like what you started, and also i need to implement some scrolling support so i put two repeat buttons at the left and right side of the scroll viewer.
my inspiration was a nice project from code project called IE tabs in wpf.
it's old as wpf and works good
I know this is an older post, but I wanted to add another idea should others be searching this on the internet.
If you set the width of the tabpanel to something larger it will be (assuming this is not a tabpanel that allows the user to continue to add other tabs in it). If you have the user adding new tabs to the tab panel, then a scroll bar will need to be added.
the easiest option is to set the ItemsPanelTemplate on the TabControl. I think the default is WrapPanel, hence the Multiline behaviour.
Change it to StackPanel for example and maybe add a ScrollViewer.
Something like this (just coding this without VS)
<TabControl>
<TabControl.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel Orientation="Horizontal"/>
</ItemsPanelTemplate>
</TabControl.ItemsPanel>
</TabControl>
hope that helps a bit...