I'm new to WPF/Silverlight and I'm just playing about with my new Windows Phone 7.
I created a new Pivot application and changed it to the following code:
<Grid x:Name="LayoutRoot" Background="Transparent">
<!--Pivot Control-->
<controls:Pivot Title="MY APPLICATION">
<!--Pivot item one-->
<controls:PivotItem Header="first">
<Ellipse Width="300" Height="300" Fill="Red">
<Ellipse.RenderTransform>
<RotateTransform CenterX="150" CenterY="150" Angle="90"/>
</Ellipse.RenderTransform>
</Ellipse>
</controls:PivotItem>
<controls:PivotItem Header="second">
<Ellipse Width="300" Height="300" Fill="Blue"/>
</controls:PivotItem>
</controls:Pivot>
</Grid>
On the first pivot item, if you start your swipe over the ellipse, it is necessary to swipe upwards to move to the next pivotitem. If you begin the swipe somewhere outside of the ellipse, the swipe gesture is left right as expected.
I'm pretty sure that this is will be obvious to a XAML veteran, I'm not really sure how I should be preventing the gesture being affected by the RotateTransform too?
Any help appreciated.
Edit:
I think that I have figured this out. If I set IsHitTestVisible="False" on the Ellipse then it all works as expected.
Related
I'm creating a dialog with a single image, and a polygon overlaid. The problem is that the scale of the image is different from that of the polygon, so I want to scale the image down to match the scale of the polygon. But when I use the RenderTransform/ScaleTransform tags, the image gets sized down leaving whitespace at the right and bottom of the dialog. Yes the overlay now works properly, but I'd like to have it fill the available space to fill the window.
<Window x:Class="vw.CollImage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Collection Image" Height="700" Width="700"
WindowStartupLocation="CenterOwner" Grid.IsSharedSizeScope="False"
Icon="Resources\ty.ico">
<Viewbox MinWidth="70" MinHeight="70">
<Grid>
<Image Name="imgColl" HorizontalAlignment="Left" VerticalAlignment="Top" Source="{Binding ImageData}">
<Image.RenderTransform>
<ScaleTransform ScaleX="0.75" ScaleY="0.75"/>
</Image.RenderTransform>
</Image>
<Polyline Stroke="OrangeRed" StrokeThickness="6" Points="{Binding Coordinates}"/>
</Grid>
</Viewbox>
</Window>
Apply it as LayoutTransform instead.
I learned how to get a ScrollViewer's scrollbars to display after scaling an element within in a ScrollViewer from this post: http://www.eightyeightpercentnerd.dreamhosters.com/?p=92
Now, I'm trying to get the scaled object (a canvas in this case) to center correctly within the ScrollViewer. I'm going to let images tell my story here (please help me before Screencast.com purges my files). ;
My XAML:
<ScrollViewer x:Name="ScrollViewer" VerticalAlignment="Top"
VerticalScrollBarVisibility="Auto" HorizontalScrollBarVisibility="Auto"
Width="300" Height="300" Margin="0" Padding="0" Background="White">
<Canvas x:Name="DesignSurface" Background="Red">
<Canvas x:Name="Surface" Background="Blue" Height="100" Width="100">
<Canvas.RenderTransform>
<TransformGroup>
<ScaleTransform x:Name="SurfaceScaleTransform" />
</TransformGroup>
</Canvas.RenderTransform>
<!-- ... -->
</Canvas>
</Canvas>
</ScrollViewer>
On initial load, my blue canvas is centered and at 100%:
After decreasing by 50%, the blue canvas is still centered:
After increasing 400% and scrolling to display the top left corner of the blue canvas:
After increasing 400% and scrolling to display the bottom right corner of the blue canvas:
So my question is simply how do I get the blue canvas centered correctly in the ScrollViewer or red canvas or whatever?
Maybe I got you wrong, but have you tried setting RenderTransformOrigin to the Canvas? E.g.:
<Canvas x:Name="Surface" Background="Blue" Height="100" Width="100"
RenderTransformOrigin="0.5, 0.5">
<Canvas.RenderTransform>
<TransformGroup>
<ScaleTransform x:Name="SurfaceScaleTransform" />
</TransformGroup>
</Canvas.RenderTransform>
<!-- ... -->
</Canvas>
In my project I want to display a small logo on the side of a custom control. Since I have no canvas I thought maybe a Visual Brush would be a good Idea to place the logo in the background.
<VisualBrush>
<VisualBrush.Visual>
<Rectangle Width="200" Height="200" Fill="Red" />
</VisualBrush.Visual>
</VisualBrush>
But the Rectangle I am using right now is not 200x200. It takes the complete available space. Thats not what I want. I also tried a Viewbox and set the stretch property but the result is the same because in the end I don't need a simple Rectangle but a canvas with many path objects as children. A Viewbox supports only one child.
This there any way to get around this problem?
You need to set TileMode, Stretch, AlignmentX and AlignmentY properties on your VisualBrush:
<VisualBrush TileMode="None" Stretch="None" AlignmentX="Left" AlignmentY="Top">
<VisualBrush.Visual>
<Rectangle Height="200" Width="200" Fill="Red"></Rectangle>
</VisualBrush.Visual>
</VisualBrush>
Add Grid and this Set Vertical alligment to Top and Horizontal alignment to Right
Sample code
<VisualBrush x:Key="myVisual">
<VisualBrush.Visual>
<Grid>
<Rectangle Height="200" Width="200" Fill="Red" HorizontalAlignment="Right" VerticalAlignment="Top" ></Rectangle>
</Grid>
</VisualBrush.Visual>
</VisualBrush>
For me, I set the following attribute on the VisualBrush, and the VisualBrush now looks exactly like a MediaElement:
Stretch="Uniform"
I want to create a TextBlock (or some other element with text in it for display only) that is vertical (-90 transform angle), but I want that element to fill up the vertical space it is contained in, but have a defined horizontal amount (I'm using vertical and horizontal terms instead of height and width since it's swapped when I have the TextBlock go vertical), and have it aligned to the left side of the container.
I believe I understand how to make a TextBlock go vertical using RenderTransform or LayoutTransform. However, I cannot seem to get the 'docking' to work properly, whenever I change the vertical aspect of the container the TextBlock increases in horizontal aspect instead of vertical.
Here is what I have:
<UserControl
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
x:Class="AttendanceTracker.StudentView"
x:Name="UserControl" Height="172.666" Width="417.333">
<StackPanel x:Name="LayoutRoot" Orientation="Horizontal">
<Border BorderBrush="Black" BorderThickness="1" RenderTransformOrigin="0.5,0.5" Background="#52FFFFFF" Width="139.667">
<TextBlock Text="My Title" TextWrapping="Wrap" FontSize="18.667" TextAlignment="Center" Foreground="White" Margin="-58.509,68.068,49.158,70.734" Background="Black" RenderTransformOrigin="0.5,0.5" Width="147.017" d:LayoutOverrides="Height">
<TextBlock.RenderTransform>
<TransformGroup>
<ScaleTransform/>
<SkewTransform/>
<RotateTransform Angle="-90"/>
<TranslateTransform/>
</TransformGroup>
</TextBlock.RenderTransform>
</TextBlock>
</Border>
</StackPanel>
Change the height of the UserControl and you will notice that the TextBlock increases in horizontal aspect instead of the desired vertical aspect.
If I understand you correctly, then this should point you in the right direction:
<StackPanel Orientation="Horizontal">
<TextBlock Background="Red" Text="My Title">
<TextBlock.LayoutTransform>
<TransformGroup>
<RotateTransform Angle="90"/>
</TransformGroup>
</TextBlock.LayoutTransform>
</TextBlock>
</StackPanel>
The key is to use LayoutTransform, not RenderTransform. This will ensure that another layout pass occurs after the transform occurs. Otherwise, the layout system is using the original bounding rectangle to layout the TextBlock.
Beyond that, I just got rid of all the Blend-generated cruft to see what was going on. Here's the result:
alt text http://img187.imageshack.us/img187/1189/screenshottbv.png
I have set a canvas' background to an image of a company logo. I would like for this image to be aligned to the bottom right corner of the canvas.
Is it possible to do this, or would it require for the image to be added into the canvas as a child? That would not work with this program as all children of the canvas are handled differently.
Thank You
Will this work? (It worked for me, anyway.)
<Canvas>
<Canvas.Background>
<ImageBrush ImageSource="someimage.jpg" AlignmentX="Right"
AlignmentY="Bottom" Stretch="None" />
</Canvas.Background>
</Canvas>
AFAIK The WPF Canvas needs child UI elements to be positioned using absolute co-ordinates.
To achieve the right-bottom-anchored effect, I think you'd need to handle the window resize event, recalculate and apply the Top,Left co-ordinates for the child Image element to always stick to the right buttom corner.
<Window x:Class="HelloWPF.Window1" xmlns...
Title="Window1" Height="300" Width="339">
<Canvas>
<Image Canvas.Left="195" Canvas.Top="175" Height="87" Name="image1" Stretch="Fill" Width="122" Source="dilbert2666700071126ni1.gif"/>
</Canvas>
</Window>
How about containing the canvas and image inside of a Grid control like so?
<Window ...>
<Grid>
<Canvas/>
<Image HorizontalAlignment="Right" VerticalAlignment="Bottom" .../>
<Grid>
</Window>
This is my solution using a border inside the canvas to align the image. This solution works well when canvas is resized:
<Canvas x:Name="MiCanvas" Height="250" Width="500" Background="Aqua">
<Border x:Name="MiBorderImage"
Width="{Binding ElementName=MiCanvas, Path=ActualWidth}"
Height="{Binding ElementName=MiCanvas, Path=ActualHeight}"
Background="Transparent">
<Image x:Name="MiImage" Source="/GraphicsLibrary/Logos/MiLogo.png"
HorizontalAlignment="Right"
VerticalAlignment="Bottom"
Stretch="None" />
</Border>
</Canvas>