I am working on a project where I want to add button in content property of TabControl in WPF.
I tried lot many ways but I failed.
This is the code Example :
XAML File
c# File
1. XAML File
<TabControl TabStripPlacement="Left" Name="DynamicTab">
<TabControl.ItemTemplate>
<DataTemplate>
</DataTemplate>
</TabControl.ItemTemplate>
<TabControl.ContentTemplate>
<DataTemplate>
</DataTemplate>
</TabControl.ContentTemplate>
2. C# File
foreach(DataContextClass glist in groupsList)
{
TabItem tab = new TabItem();
StackPanel sp = new StackPanel();
tab.Header = glist.ItemGroup;
DynamicTab.Items.Add(tab);
itemsList = itemsDALObj.ItemsGroupWise(glist.ItemGroup);
for(int i =0 ; i<itemsList.Count;i++)
{
Button b = new Button();
b.Name = "Button" + (i + 1);
b.Content = itemsList[i].ItemName;
b.Height = 80;
b.Width = 100;
tab.Content = sp;
sp.Children.Add(b);
}
};
I tried following options:
By adding stackpanel, Grid, Button in <DataTemplate> of <TabControl.ContentTemplate>.
By adding Dynamic Grid and in that Grid I add Dynamic Button.
Many other ways also which I am not able to explain.
You have to replace in XAML instead of <TabControl.ContentTemplate> replace it with <TabControl.DataContext> and that's the solution it takes me hours to find this little mistake.
<TabControl.DataContext>
<DataTemplate>
</DataTemplate>
</TabControl.DataContext>
The above is the change in XAML part.
A TabControl is designed around the idea that the only controls that will be added to it are TabItem controls.
You can in fact, add other controls directly to the parent TabControl object, but when you do, it automatically creates an implicit TabItem anyway to hold those objects.
For instance, if you add two Button controls directly to the TabControl, two implicit TabItem controls are created, one to hold each Button:
<TabControl>
<Button/>
<Button/>
</TabControl>
This works, but is very much the wrong way to go about it.
To properly add content to a TabControl, first create a TabItem. Add your other controls to the TabItem, and then add the TabItem to the TabControl. (You can add the TabItem to the TabControl first if you want, it doesn't really matter)
In XAML:
<TabControl>
<TabItem Header="This is the label for the tab item.">
<Button Content="My Button"/>
</TabItem>
</TabControl>
In code (assuming a pre-existing TabControl):
TabItem ti = new TabItem();
ti.Header = "Tab Header Text";
Button bt = new Button();
bt.Content = "Button Text";
ti.Content = bt;
myTabControl.Items.Add(ti);
A TabControl, like all WPF controls is a container. It can hold multiple objects, but all of those objects are actually TabItem objects. The TabItem control can only hold one object, so if you want it to contain more than just the Button, you have to add a different container to the TabItem first; like a Grid or StackPanel.
Related
I am making an app in WPF that displays an image which can be dragged and zoomed. Bottom, right and upper sides contain some UI elements like buttons and in the center I have a TabControl to which I add TabItems in the code of ViewModel. These TabItems consists of their content (an image) and a header where I have tab buttons. The problem I have is that an image I drag covers the header but not the buttons as you can see on the screenshot. The behavior I expect is to have this image hidden underneath the entire header, not only buttons. It only happens with the bottom side. When I drag the image to the top or right it gets hidden behind the sides like it's supposed to.
Header issue
I tried to change its background, opacity and ZIndex but nothing worked for me.
Here is my code.
XAML:
<TabControl Grid.Row="1" Grid.Column="0" TabStripPlacement="Bottom" Background="LightGray" ItemsSource="{Binding LayoutTabs}"
SelectedIndex="0" SelectedItem="{Binding SelectedTab, Mode=OneWayToSource}"/>
C#:
LayoutTabs = new BindableCollection<TabItem>();
for (int i = 0; i < _content.LayoutImages.Count; i++)
{
DrawingImage drawing = _content.LayoutImages.ElementAt(i);
Image image = new Image() { Source = drawing };
image.MouseMove += OnMouseMove;
var container = new LayoutContainer()
{
Background = Brushes.WhiteSmoke,
Child = image,
Focusable = true,
};
var tabItem = new TabItem()
{
Header = _content.GetLayoutName(i),
Content = container
};
LayoutTabs.Add(tabItem);
}
That behaviour is due to the headerpanels background being set to transparent in the default control template. If you right click the tabcontrol in the Designer window (not xaml editor) and click on Edit Template->Edit a Copy you get a copy of that tempalte and can then modify the headerpanel with your BackgroundColor and if need be increase the Zindex:
[....]
//this is the line to make your changes on:
<TabPanel x:Name="headerPanel" Background="Transparent" Grid.Column="0" IsItemsHost="true" Margin="2,2,2,0" Grid.Row="0" KeyboardNavigation.TabIndex="1" Panel.ZIndex="1"/>
[....]
My name is Andrea this is my first post ever.
Frequently you have helped me as a simple reader, now I'm writing because I wanted to direct support.
I have to create and a tab control and with a button "Add Tab" I have to add a new tab with the same content.
Up to this everything is fine.
Within Tab I have a textedit and a combobox.
My problems are two:
1 How do I load the contents of the combobox for each tab I add?
2 Every time I write the text of and a edit tab override also edit the text of the other tab.
Here the code:
Data Template in Xaml:
<DataTemplate x:Key="tabItemContent">
<dxlc:LayoutGroup Orientation="Vertical" Header="Target Description" IsCollapsible="True">
<!--Name-->
<dxlc:LayoutItem>
<dxlc:LayoutGroup Orientation="Horizontal" ItemSpace="4" >
<dxlc:LayoutItem Label="Name" Margin="10">
<dxe:TextEdit x:Name="TextEdit_NameTarget"/>
</dxlc:LayoutItem>
</dxlc:LayoutGroup>
</dxlc:LayoutItem>
<!--Nation e Label-->
<dxlc:LayoutItem>
<dxlc:LayoutGroup Orientation="Horizontal" ItemSpace="12" >
<dxlc:LayoutItem Label="Nation" Margin="10">
<ComboBox x:Name="ComboBox_TargetNazione" />
</dxlc:LayoutItem>
</dxlc:LayoutGroup>
</dxlc:LayoutItem>
</dxlc:LayoutGroup>
</DataTemplate>
C#:
private void Button_Click_Add(object sender, RoutedEventArgs e)
{
DataTemplate tabItemDataTemplate = this.TryFindResource("tabItemContent") as DataTemplate;
DXTabItem tabItem = new DXTabItem();
tabItem.Header = "New Tab";
tabItem.ContentTemplate = tabItemDataTemplate;
tabControl_Targets.Items.Add(tabItem);
}
Here's where to load the list into the combobox:
private void LoadComboBoxNation()
{
ComboBox_TargetNazione.ItemsSource =
ManagementTriple.Istance().get_Nation_byTipologyAndContext(ComboBox_TypologyScenario.SelectedItem.ToString(),
ComboBox_ContextScenario.SelectedItem.ToString());
controlloselecteditem(ComboBox_SourceNazione.SelectedItem.ToString());
controlloselecteditem(ComboBox_TargetNazione.SelectedItem.ToString());
}
Thank you all for the help that you can give me.
DataTemplates require a simple but fundamental requirement to work properly: you should use the ViewModel-First approach.
Ideally, your tab control should have a Binding to some ViewModel. Then, if you want another tab to appear, you should use your button click to call a Command in your ViewModel, then the ViewModel would add another item to your TabControl ItemsSource property (which would be some collection), and the new item would be displayed "automagically" with its respective DataTemplate.
The idea of WPF is to replace all this imperative code in the View (like the one you posted) with a more indirect one, where your only worry is to manipulate things in the ViewModel, and the "Dumb View" just follows.
Hope this helps, but don't hesitate to ask for additional details in the comments.
how to maintain the width of the tabItems should be equal if i open multiple tabItems. know i am not getting this thing. i tried the following code
HorizontalContentAlignment="stretch"
i used the above code but it is not working. but i am getting like this
for tabcontrol i write the following code
<TabControl Name="tabControl1" Margin="175,44,0,0" >
<Grid></Grid>
</TabControl>
tabItems will dynamically adding to the Tabcontrol
TabItem tabitem2 = new TabItem();
Page2 pgobj1 = new Page2();
Frame tabframe1 = new Frame();
tabframe1.Content = pgobj1;
tabitem2.Header = "Tab 2Tab 2Tab 3";
tabitem2.Width = 300;
tabitem2.Content = tabframe1;
tabControl1.Items.Add(tabitem2);
tabitem2.IsSelected = true;
i don't want those spaces in between the tabItems. and they automatically resize if more number of tabs are opened. kindly help me out in this.
After removing the Hardcoded width property
it comes like this
Remove hardcoded width you are setting on TabItem. No need to set that, TabItem will automatically adjust its width base on header content.
tabitem2.Width = 300; // Remove this line
If you want items to come in single line and scroll using ScrollViewer, you need to modify Template of TabControl like mentioned here. I am posting the code from there for the sake of completeness of answer:
<TabControl Name="tabControl1">
<TabControl.Template>
<ControlTemplate TargetType="TabControl">
<StackPanel>
<ScrollViewer HorizontalScrollBarVisibility="Auto"
VerticalScrollBarVisibility="Disabled">
<TabPanel x:Name="HeaderPanel"
Panel.ZIndex ="1"
KeyboardNavigation.TabIndex="1"
Grid.Column="0"
Grid.Row="0"
Margin="2,2,2,0"
IsItemsHost="true"/>
</ScrollViewer>
<ContentPresenter x:Name="PART_SelectedContentHost"
SnapsToDevicePixels="{TemplateBinding
SnapsToDevicePixels}"
Margin="{TemplateBinding Padding}"
ContentSource="SelectedContent"/>
</StackPanel>
</ControlTemplate>
</TabControl.Template>
</TabControl>
Also check out this answer here.
If I understand you correctly, you want that all tab items should have equal width. You can achieve that by wrapping each tab item header inside a Grid with a ColumnDefinition that uses a SharedSizeGroup. Furthermore, you must mark the TabControl like this:
<TabControl x:Name="tabControl1" Grid.IsSharedSizeScope="True">
The following code shows how to set the Header property programmatically:
Grid grid = new Grid();
grid.ColumnDefinitions.Add(new ColumnDefinition
{
SharedSizeGroup = "MySharedSizedGroupName",
Width = new GridLength(1.0, GridUnitType.Auto)
});
grid.Children.Add(new TextBlock{Text="Tab 5"});
tabitem2.Header = grid;
EDIT: And one other point: I think the <Grid></Grid> you have added as a child to the TabControl is unnecessary, because it creates that empty tab on the left side in the first tab row.
All,
I have searched extensively for the solution here but I have a feeling my problem stems from a basic lack of knowledge about WPF. I am new to it and have thus far hacked and Googled my way through as best I can.
Basically, I have a Ribbon dynamically interacting with a TabControl. The Ribbon tabs select a category of items, the MenuItems in the RibbonGroups then choose an item within the category. Upon clicking an item, the tabs on the TabControl need to dynamically change. Whether that is just the Headers, the tabs themselves, or the entire TabControl is fine with me. Thus far, upon clicking a MenuItem on the inside one of the RibbonGroups, I attempt to just set the Header text equal to "blah" for each tab on the TabControl. Then the Header object throws a null pointer. This is what happens whether I set the Header, the Tabs, or the TabControl itself.
Why?!?!?!?
...and how in the world do I fix it???
Thanks!
WPF is designed with data/UI separation in mind. One of the reasons you're having trouble finding a solution is because what you're trying to do is a no-no; instead of programmatically changing the UI's header text, you should be changing the underlying data instead, and allowing the WPF plumbing to update how the data is displayed.
A WPF tab control can literally contain any type of object; you could fill it with integers or strings or FooBars or whatever. There's no guarantee that any of these objects will define a Header property, and it's up to the developer to configure data bindings or templates which instruct the TabControl just how a FooBar or a whatever should be displayed.
In an ideal WPF application which adheres to the MVVM design pattern, you might have your TabControl bound to a collection of view models which each define a HeaderText property. Your view models would implement the INotifyPropertyChanged interface so that when the HeaderText property was changed on the view model then the UI would get updated.
Having said all that, if you've got an existing application it may be unrealistic to rewrite it from scratch using a different design pattern, and MVVM is not easily added on to an existing code base. If you're working with simple Designer generated UI without using any data binding, then the following code does what you ask. Sometimes.
foreach(TabItem item in tabControl.Items)
item.Header = "blah";
... but as I said before, there's no guarantee that a WPF TabControl's Items collection will contain items of type TabItem, so this code is not safe.
While RogerN's answer is probably a better answer, here is a code sample that changes the text that appears on a tab:
XAML:
<Grid>
<Grid.RowDefinitions>
<RowDefinition />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<TabControl Name="MyTabControl">
<TabItem Header="Tab One">
<TextBlock Text="This is tab #1." />
</TabItem>
<TabItem Header="Tab Two">
<TextBlock Text="This is tab #2." />
</TabItem>
<TabItem Header="Tab Three">
<TextBlock Text="This is tab #3." />
</TabItem>
</TabControl>
<Button Grid.Row="1" Content="Change Tab" Name="ChangeButton" Click="ChangeButton_Click" />
</Grid>
Code behind:
public partial class MainWindow : Window {
public MainWindow() {
InitializeComponent();
}
private void ChangeButton_Click(object sender, RoutedEventArgs e) {
((TabItem)MyTabControl.Items[0]).Header = "Changed!";
}
}
Try binding it to a list in the code like so:
private List<TabItem> TabItems = new List<TabItem>()
{
"Item1",
"Item2",
"Item3"
};
tabcontrol1.ItemSource = TabItems;
Then rebind it any time you want to change the items in the tabcontrol. This way you can dynamically change names and add more tab items. In doing this you'll have to programmatically add controls using the TabItem.Content property.
I have in the mainwindow this code:
<TabControl x:Name="tc" Margin="0" SelectedIndex="0">
<TabItem Header="Tab 1" Width="150"
IsSelected="false">
<!--<TextBox Width="200" Height="200"/>-->
</TabItem>
</TabControl>
i have a mainwindowviewmodel and i want it to bind to the controltab name which is tc:
private void AddTab_Execute(object parm)
{
s = s + 1;
TabItem Item = new TabItem();
Item.Width = 150;
Item.Header = "Tab " + s;
tc.Items.Add(Item);
}
he doesn't recognize tc
what do i have to do ?
This has nothing to do with binding, but it would be easier if you had one. You should not need to reference controls like the TabControl in the view-model.
Bind the ItemsSource of the the TabControl to an ObservableCollection, then you just need to add items to that collection. Use the ItemTemplate (header) and ContentTemplate (tab item content) to create the tabs from the items in the collecton dynamically.
First of all, be careful with how you are using the word "bind". That has a particular meaning which is not what you are doing in your example. To see what binding actually means, check out this article.
You cannot access controls in your UI from your viewmodel. What you should be doing is binding the ItemsSource of the TabControl to a collection in the viewmodel. You can create DataTemplateSelectors and use them for the TabControl's ContentTemplateSelector and ItemTemplateSelector if you want to select different templates depending on the item which is bound to each TabItem.