In xaml code
<StackPanel>
<ScrollViewer>
<local:CustomCanvas>
</local:CustomCanvas>
</ScrollViewer>
</StackPanel>
CustomCanvs has a zoom in/out function. But when I spin the mouse wheel in the CustomCanvas area, ScrollViewer's scrollbar works and zoom in/out don't work. And when I scroll the scrollbar of the ScrollViewer, not only CustomCanvas' zoom in/out work but also scrolling of the ScrollViewer work well.
When I spin the mouse wheel, I want only zoom in/out. And when I scroll the scrollbar, I want only scrolling to work.
How I can prevent mouse wheel event of ScrollViewer from spining mouse wheel?
And how I can prevent zoom in/out from scrolling of ScrollViewer's scrollbar?
Please help
you could handle the MouseWheel Event of Custom Canvas so that when the mouse is pointed in your canvas area and the wheeling event accured you set the Handled property of the MouseWheelEventArgs to true :
private void UIElement_OnMouseWheel(object sender, MouseWheelEventArgs e)
{
e.Handled = true;
//handler your zoomIn/Out here
}
and in the Xaml
<StackPanel>
<ScrollViewer>
<local:CustomCanvas MouseWheel="UIElement_OnMouseWheel">
</local:CustomCanvas>
</ScrollViewer>
</StackPanel>
Related
Please provide storyboard for smooth touch scrolling for tablet in wpf. In my case touch response is not smooth and is shifting like it is going to a different page.
No need for storyBoard...
just add scrollviewer to your code
<ScrollViewer
VerticalScrollBarVisibility="Visible" HorizontalScrollBarVisibility="Disabled" PanningMode="Both" ManipulationBoundaryFeedback="ScrollViewerCanvas_ManipulationBoundaryFeedback">
//Add stuff here
</ScrollViewer>
in codeBehind:
private void ScrollViewerCanvas_ManipulationBoundaryFeedback(object sender, ManipulationBoundaryFeedbackEventArgs e)
{
e.Handled = true;
}
I want to achieve a very well known behavior seen in the browser when you have an image to display that is larger then the monitor:
Originally, the image is displayed fitting inside the window area, and the mouse cursor is a magnifying glass with a "+" icon;
If you click, two things happen:
a. The image is displayed with its native pixel size;
b. Scroll bars appear;
I want this effect with a larger-than-screen UniformGrid. For that, I can use ViewBox. I have already got what I want putting the control inside a ViewBox with Stretch.Uniform property, and upon MouseLeftButtonDown event it toggles between Stretch.None and Stretch.Uniform, just like the large image in browser analogy, only without scroll bars.
Now if I add the ScrollViewer (ViewBox -> ScrollViewer -> UniformGrid), the effect doesn't work anymore, because the ScrollViewer always displays the (larger than window) MyUserControl with its native resolution, that is, clipped and with scroll bars activated, while I would like to alternate between this and a "fitting in ViewBox" version.
Here is how I get the resizing, but the ScrollViewer never displays:
<Viewbox x:Name="vbox" Stretch="None">
<ScrollViewer x:Name="scroll" VerticalScrollBarVisibility="Auto" HorizontalScrollBarVisibility="Auto" >
<UniformGrid x:Name="ugrid" Columns="2" MouseLeftButtonDown="UniformGrid_MouseLeftButtonDown">
<local:AtlasMasculinoAnterior/>
<local:AtlasMasculinoPosterior/>
</UniformGrid>
</ScrollViewer>
</Viewbox>
And if change the order, then the Scroll bars always display and the zoom doesn't toggle upon mouse click (although the event fires):
<ScrollViewer x:Name="scroll" VerticalScrollBarVisibility="Auto" HorizontalScrollBarVisibility="Auto" >
<Viewbox x:Name="vbox" Stretch="None">
<UniformGrid x:Name="ugrid" Columns="2" MouseLeftButtonDown="UniformGrid_MouseLeftButtonDown">
<local:AtlasMasculinoAnterior/>
<local:AtlasMasculinoPosterior/>
</UniformGrid>
</Viewbox>
</ScrollViewer>
And here the code behind event:
private void UniformGrid_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
if (vbox.Stretch == Stretch.None)
{
vbox.Stretch = Stretch.Uniform;
}
else
vbox.Stretch = Stretch.None;
}
So what am I doing wrong, or what should I do so that the intended behavior works?
The way I see it, I would like to alternate between having the control in a ViewBox (Stretch.Uniform) and having the control inside a ScrollViewer, but I wonder how to have the same effect with both elements being part of the layout tree (one inside another), or even if I should, move the UniformGrid in and out of containers I would manipulate programmatically in code behind.
Got it to work in sort of a hackish way, by having a Grid with both a ViewBox and a ScrollViewer, and putting the UniformGrid inside one of them in XAML. Then, in code-behind, I programmatically detach the UniformGrid from its present container, and attach it to the other (using a boolean flag to control where it is, but that is debatable):
<Grid x:Name="grid">
<ScrollViewer x:Name="scroll" HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Auto"/>
<Viewbox x:Name="viewbox" Stretch="Uniform">
<UniformGrid x:Name="ugrid" Columns="2" MouseLeftButtonDown="UniformGrid_MouseLeftButtonDown">
<local:AtlasMasculinoAnterior/>
<local:AtlasMasculinoPosterior/>
</UniformGrid>
</Viewbox>
</Grid>
and
bool atlasfullscreen = false;
private void UniformGrid_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
UniformGrid ug = sender as UniformGrid;
if (atlasfullscreen)
{
scroll.Content = null;
viewbox.Child = ug;
atlasfullscreen = false;
}
else
{
viewbox.Child = null;
scroll.Content = ug;
atlasfullscreen = true;
}
}
I had a similar use case where I had an item that I needed to alternate between Stretch.None and Stretch.Uniform, and when Stretch.None, I needed the scrollbars to be visible.
What I finally figured out was that when I set Stretch.None, I needed to set the ScrollViewer's Width & Height to the ViewBox's parent ActualWidth / Height, and when Stretch.Uniform, I needed to clear the ScollViewer's width and height.
So using your original XAML, plus the new Grid, here's the new XAML:
<Grid x:Name="grid">
<Viewbox x:Name="vbox"
Stretch="Uniform">
<ScrollViewer x:Name="scroll"
HorizontalScrollBarVisibility="Auto"
VerticalScrollBarVisibility="Auto">
<UniformGrid x:Name="ugrid"
Columns="2"
MouseLeftButtonDown="UniformGrid_MouseLeftButtonDown">
<local:AtlasMasculinoAnterior />
<local:AtlasMasculinoPosterior />
</UniformGrid>
</ScrollViewer>
</Viewbox>
</Grid>
New code behind:
private void UniformGrid_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
if (vbox.Stretch == Stretch.None)
{
vbox.Stretch = Stretch.Uniform;
scroll.Width = double.NaN;
scroll.Height = double.NaN;
}
else
{
vbox.Stretch = Stretch.None;
scroll.Width = grid.ActualWidth;
scroll.Height = grid.ActualHeight;
}
}
You might need to tweak the above example for how the Viewbox now being in a grid - but for my use case with similar XAML / code I got mine working without having to constantly move the child from the Viewbox to another control and back again.
So in summary: when Viewbox.Stretch = Uniform, set scrollviewer's width / height to double.NaN, and when Viewbox.Stretch = None, set scrollviewer's width / height to Viewbox.Parent.ActualWidth / Height.
I'm implementing a templated control, which should work as virtual keyboard button - when you hold it, it displays a popup with additional options to choose.
I've implemented the popup more less in the following way:
<Grid>
<Border>Content</Border>
<Grid x:Name="gPopup" Visibility="Collapsed">
<StackPanel x:Name="spSubItems" Orientation="Horizontal" />
</Grid>
</Grid>
I show the popup by changing visibility to visible and setting negative margins for top and bottom. However, when I do that, and when the popup is actually larger than the control, the control is being resized to match its size - despite fact, that it is not inside:
How can I implement the popup, such that it won't expand the container it's on? And such that the container will still match size of its contents?
Edit: In response to comments and answers
I'm not sure if I'm understood correctly. Here's an image with explanation:
I'd like to keep the original container's size the same after showing the popup. I'm unsure how WrapPanel or DockPanel could help me with that.
The solution is simply to use Popup instead of positioned Grid.
Sample- Create a grid
<Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
<!-- Setting a Rectangle having transparent background which set the
Visibility of popup -->
<Rectangle Name="popupRect" Fill="#80000000" Visibility="Collapsed"/>
<!—Here in the above Code we are just filling the rectangle With the transparent BackGround -->
<!—Creating A Border -->
<Border Name="popupBorder" Background="{StaticResource PhoneChromeBrush}" BorderBrush="Red" BorderThickness="2"
HorizontalAlignment="Center" VerticalAlignment="Center" Visibility="Collapsed">
<!-- Creating A grid Inside the Border and Rectangle -->
</Grid>
Create event for which popup should appear(for both cancel and appear)-
private void cancelButton_Click(object sender, RoutedEventArgs e)
{
popupRect.Visibility = Visibility.Collapsed;
popupBorder.Visibility = Visibility.Collapsed;
}
private void popupButton_Click(object sender, RoutedEventArgs e)
{
popupRect.Visibility = Visibility.Visible;
popupBorder.Visibility = Visibility.Visible;
}
It will work, I guess.
Like spook says, put your gPopup Grid in a Popup element and show it by opening the popup. This won't affect the main visual tree.
The reason the embedded grid embiggens the border is that the outer grid has to expand to hold pGrid and the border expands to fill the outer grid.
I'm creating a WPF application containing a "Main-Content" - Layer containing a TabControl and a "Dialog" - Layer containing an ItemsControl.
The XAML looks like this:
<Grid>
<TabControl>
..Some Tabs
</TabControl>
<ItemsControl>
<ContentControl Content={Binding Dialog1Property} />
<ContentControl Content={Binding Dialog2Property} />
</ItemsControl>
</Grid>
Usually "Dialog1Property" and "Dialog2Property" are null which means the ItemsControl is invisible. Whenever I assign a Control to one of them, it is shown in front of the TabControl which is exactly what I want. If I assign a gray Rectangle with an opacity of 0.7 to one of the Dialog - Properties it creates a Gray overlay.
If I click on the Tab, which is slightly visible through the overlay, nothing happens - the Rectangle blocks Mouse Events. It is, however, still possible to focus the TabControl behind the overlay using the Tab-Key and therefore it is also possible to switch tabs even though a Dialog is shown.
Is there an easy way to tell the rectangle to somehow block key events as it allready does with Mouseclicks?
Regards
BBRain
Yes, on your Rectangle, subscribe to the event PreviewKeyDown.
<Rectangle Opacity="0.7" Fill="Green" PreviewKeyDown="Rectangle_PreviewKeyDown" />
In its handler, simply set e.Handled = true;
private void Rectangle_PreviewKeyDown(object sender, KeyEventArgs e)
{
e.Handled = true;
}
Since routed events prefixed with "Preview..." are tunneling, the elements under your rectangle won't recieve the input.
How can I lock vertical scrolling of a ScrollViewer by using the mouse wheel ?
If I understood you well, you wish to be able to scroll using the vertical scroll bar but not using the mouse wheel.
In this case just catch the mouse wheel event on your ScrollViewer content and mark it as handled:
<ScrollViewer>
<StackPanel MouseWheel="MyContent_MouseWheel">
...
</StackPanel>
</ScrollViewer>
and in code behind:
private void MyContent_MouseWheel(object sender, MouseWheelEventArgs e)
{
e.Handled = true;
}