I have some experience in making Winform applications, but not in WPF.
My questions is about panels in WPF.
In Winform, say, I have two panels: PanelA and PanelB. I can place PanelB on top of PanelA by setting PanelB to visible and PanelA to hidden. By doing so, all the controls on PanelA are disabled, which means the controls are not visible to users and cannot be selected by hitting TAB.
However, in WPF, I cannot find an equivalent control to achieve the same effect. I have tried Rectangle, but the controls on the underneath Rectangle can still be selected if the users hit TAB.
I want something that can not only visually block the controls(buttons, etc.), but also preventing the users from selecting them by hitting TAB.
I know there is a way to do it by setting the IsEnabled property to false in WPF in order to disable the controls. But is there an easier way? Like the Panel control in Winform?
I don't know if it is easier than setting the IsEnabled property of the entire Panel to false but the second element you add to a Grid in WPF ends up on top of the first one. So if you want to hide and effectively disable a Rectangle, you could add it to a Grid and then add another element to the same Grid, e.g.:
<Grid>
<Rectangle Width="100" Height="100" Fill="Green" />
<!-- This child Grid that contains a Button element will effectively hide the above Rectange -->
<Grid>
<Button Content="On top..." />
</Grid>
</Grid>
Related
Im trying to create a chat application and Im trying to utilize the RichTextBox control for the chat log, the textbox for the user to enter the message and the users online board. But WPF wont allow me to have more than 1 RichTextBox. Whenever I copy paste the only richtextbox on the window WPF creates a copy of it but deletes the first RTB . It also wont allow me to drag and drop one. What do I have to tweak to allow myself to drop more controls ?
Any Window can only have one child element. In your case, depending on how you intend to layout your RTBs, you would need some sort of Panel. Here's a good place to start.
Here's a really quick example (stripped down) explaining a bit more:
<Window>
<!-- You could put a RTB here, but that would become your root control, and it can't have any siblings -->
<Grid>
<!-- Use something like this to layout your inner RichTextBoxes -->
<Grid.RowDefinitions>
<RowDefinition Height="9*" /> // using 9/10 of the available vertical space
<RowDefinition Height="1*" /> // using 1/10 of the available vertical space
</Grid.RowDefinitions>
<!-- Here you can put multiple controls -->
<RichTextBox Grid.Row="0"></RichTextBox>
<RichTextBox Grid.Row="1"></RichTextBox>
</Grid>
</Window>
You can place a Grid or any other Panel like StackPanel, DockPanel, etc. in the Window and put 2 RichTextBoxes in it. Window is a ContentControl which means it can hold only 1 control. Grid is a Panel so it can hold as many controls as you want.
You can make Columns and rows in the Grid or use Margin explicitly to position your RichTextBoxes.
I'd like to have some sort of semi transparent/translucent effect displayed over the entire page and then display my option buttons on top of it but I just can't figure out how and it's driving me nuts! I've seen it in plenty of wp8 apps so it is doable but I just don't know how!
Once this semi transparent/translucent effect is displayed, I want it to dissapeared if clicked on or if one of my option buttons is clicked, and restore the screen as it was or execute an action accordingly.
I've somehow managed to do it by setting the Background colors using a storyboard but strangely enough, once displayed and my options buttons appear, they look fine but once the storyboard is completed, the button then look disabled as well which just looks wrong!!
What is the proper way to give a "Disabled" effect as if you had a semi transparent dialog box displayed over a window.
Any ideas, suggestions or code would be appreciated.
Thanks.
You may be making this more complicated than it needs to be. Consider the following XAML for example:
<Grid x:Name="LayoutRoot">
<Grid.RowDefinitions>
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<Grid x:Name="ContentRoot">
...
</Grid>
<Grid x:Name="ContentOverlay" Background="#AA000000" Visibility="Collapsed">
...
</Grid>
</Grid>
Both ContentRoot and ContentOverlay will anchor at the top left of the LayoutRoot grid and span the row height. They will stack from furthest to closest in order of declaration, so ContentRoot will be rendered beneath ContentOverlay. Simply manipulate the Visibility of ContentOverlay based on user input.
Alternatively, you can set the Opacity for ContentOverlay to 0 along with collapsed visibility (required so it doesn't intercept hits to the ContentRoot child controls below) and fade it in and out using storyboarding in Blend. That probably looks like a slightly cleaner transition to a user, even if it's only 0.3 seconds long or so.
Use Blend to specify VisualStates (View | States. Then 'states' tab.) You can switch between states in code behind using VisualStateManager.GoToState. One state would be normal, the other all controls disabled.
Mike
I am using the Fluidkit ElementFlow control that I use to display a UserControl that contains textblock with a ScrollViewer as well as button and when they are displayed in the ElementFlow control, all of the buttons and the ScrollViewer seem to be disabled because I can't scroll the ScrollViewer scrollbar and even a simple action as hovering over a button doesn't do anything to the button.
Below is an example of the TextBlock in a ScrollViewer that does not allow for scrolling when used in the ElementFlow.
How can this be fixed?
<ScrollViewer
Height="1200" Width="800"
MaxHeight="1200" MaxWidth="800"
VerticalScrollBarVisibility="Auto">
<TextBlock
Height="Auto" Width="800"
MaxWidth="800"
FontSize="20"
Text="Super long text"
TextWrapping="Wrap"/>
</ScrollViewer>
Just looking over the source code for the project, it looks like it is creating a 3D mesh, and painting the controls on the mesh. This would prevent all user interaction. I don't think there is an easy way to work around this.
However, since you have the source code, you can do the work yourself to make it happen. You're going to need to modify how the ElementFlow represents its items. Look at the CreateMeshModel function. It is currently creating a mesh and applying a VisualBrush to it. Instead, look at the blog post Interacting with 2D on 3D in WPF to figure out what needs to happen.
I have a Popup that consists of a grid of labels. The popup sits inside a Canvas like this.
<Canvas x:Name="mainCanvas">
<Popup x:Name="mainPopup"
IsOpen="True"
PlacementTarget="{Binding ElementName=mainCanvas}"
PopupAnimation="Fade"
AllowsTransparency="True"
Placement="Center">
Wrapping inside the canvas (or similar control) is the only way I've found to allow the popup's contents to be transparent.
Anyway, all of this works fine and I see my grid of labels across the center of the screen. What I'd really want though is to display the grid of labels across the bottom of the screen. However when I change Placement="Center" to Placement="Bottom", I don't see the popup at all.
Have you seen this? It is a pretty good explanation about how popup placement works.
I created a test WPF project in Blend and pasted your exact code, then changed Placement to Bottom. I did see the content I added to the popup (a TextBlock with some junk text), but it was hard to see, since it is positioned below mainCanvas (as expected).
So... there must be some other problem aside from the code you showed.
Right now I have a DockPanel that contains a toolbar and BrowserWindow. When I re-size the BrowserWindow to fit content, I want that change to propagate up into the DockPanel and re-size automatically. Is there a setting for this?
So the layout of my app is essentially:
-Browser Control Class
--DockPanel
----Toolbar (docked to Top)
----Browser Window Class
------Grid
--------Menu
--------Embedded Browser
Basically I want the size that I set on my Browser Window Class to automatically re-size the DockPanel.
Before applying size to Browser Window:
After applying size to Browser Window (I want to get rid of that extra space surrounding the embedded browser):
DockPanel has a LastChildFill property that you can use. Try to play with it a little. Remember that BrowserWindow needs to be the last child in DockPanel.
I think you will also have to change something in your Grid. By LastChildFill property should be set. You are on right track at least.
Change your DockPanel to a StackPanel, put it inside a Grid, and set it's HorizontalAlignment and VerticalAlignment to Center
You might also need to play with the the Height/Width of the WebBrowser to specify the initial size
<Grid>
<StackPanel HorizontalAlignment="Center" VerticalAlignment="Center">
<Menu />
<WebBrowser Height="SomeValue" Width="SomeValue" />
</StackPanel>
</Grid>
Can't you specify Width="Auto"?