I have a WPF Window with Viewbox. I want one of the child elements of this Viewbox to stay the same size at any screen resolution.
My XAML:
<Viewbox Name="MyMainViewbox" Stretch="Fill">
<Grid Name="MyMainGrid">
<Image Source="Images/bg.bmp" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Stretch="Fill"/>
<Image Name="Thumb1" Source="Images/t1.png" MouseUp="Right_Click" Margin="0, 100, 50, 0" HorizontalAlignment="Right" VerticalAlignment="Stretch" Visibility="Visible"/>
<Image Name="Thumb2" Source="Images/t2.png" MouseUp="Left_Click" Margin="50, 100, 0, 0" HorizontalAlignment="Left" VerticalAlignment="Stretch" Visibility="Visible"/>
<Image Name="CurThumb" Width="640" Height="480" Stretch="UniformToFill" Margin="0, 50, 0, 0" HorizontalAlignment="Center" VerticalAlignment="Center" Visibility="Hidden"/>
</Grid>
</Viewbox>
The first 2 images inside the Viewbox are predefined and scaled finely at the different screen resolutions.
My problem is with the 3rd image that gets its source during the runtime and should be of the same exact size at all resolutions. It will contain photos taken at 4x3 aspect ration, and I want them to stay so.
However at 16x9 screen resolutions they are stretched. I have tried to set a fixed size in XAML - it doesn't work. I have tried to set Stretch to None - doesn't work neither. I have tried to rest the sizes of this Image in the code behind - to no avail.
What else can I do to make this third picture unscalable?
It should stay inside the Viewbox for a couple of reasons.
Use two overlapping elements.
<Grid>
<Viewbox>
<Grid>
... scaled images
</Grid>
</Viewbox>
<Grid>
... non scaled images
<Grid>
<Grid>
Related
I have a layout contained within a ScrollViewer in which I need to draw a horizontal dashed line that stretches to the full width of the container. The closest I've managed is the following
<ScrollViewer HorizontalScrollBarVisibility="Auto">
<StackPanel>
<Button Width="400" Height="50" VerticalAlignment="Top" Margin="10" />
<Line HorizontalAlignment="Stretch" VerticalAlignment="Bottom" Stroke="Black"
X2="{Binding ActualWidth, RelativeSource={RelativeSource Self}}"
StrokeDashArray="2 2" StrokeThickness="1" />
</StackPanel>
</ScrollViewer>
This nearly works, however once the container (in my case a window) has been enlarged, the line doesn't shrink back down to the appropriate size when the container is sized back down. The below is the screenshot of the same window after I have horizontally sized the window up and down.
Note that the fact that the line is dashed is important as it means that solutions that involve stretching the line don't work (the dashes appear stretched).
I know that this is because of the X2="{Binding ActualWidth, RelativeSource={RelativeSource Self}}" binding (by design the line is always the widest thing in the scrollable region, so when I size the window down the scrollable region the line defines the width of the scrollable region), however I can't think of a solution.
How can I fix this problem?
Screenshot of why using ViewportWidth doesn't work
I realised that what I needed was for the Line to ask for zero space during the measure step of layout, but then use up all the available space during the arrange step. I happened to stumble across the question Make WPF/SL grid ignore a child element when determining size which introduced the approach of using a custom decorator which included this logic.
public class NoSizeDecorator : Decorator
{
protected override Size MeasureOverride(Size constraint) {
// Ask for no space
Child.Measure(new Size(0,0));
return new Size(0, 0);
}
}
(I was hoping that some existing layout control incorporated this logic to avoid having to write my own layout logic, however the logic here is so simple that I'm not really that fussed). The modified XAML then becomes
<ScrollViewer HorizontalScrollBarVisibility="Auto">
<StackPanel>
<Button Width="400" Height="50" VerticalAlignment="Top" Margin="10" />
<local:NoSizeDecorator Height="1">
<Line Stroke="Black" HorizontalAlignment="Stretch"
X2="{Binding ActualWidth, RelativeSource={RelativeSource Self}}"
StrokeDashArray="2 2" StrokeThickness="1" />
</local:NoSizeDecorator>
</StackPanel>
</ScrollViewer>
This works perfectly
You may put a very long Line in a left-aligned Canvas with zero Width and ClipToBounds set to false.
<ScrollViewer HorizontalScrollBarVisibility="Auto">
<StackPanel>
<Button Width="400" Height="50" VerticalAlignment="Top" Margin="10" />
<Canvas HorizontalAlignment="Left" Width="0" ClipToBounds="False">
<Line Stroke="Black" StrokeDashArray="2 2" X2="10000"/>
</Canvas>
</StackPanel>
</ScrollViewer>
I am writing program for Windows Phone 7.1 and using component Image, I stretch image in it - and its get blurry. I`ve studied such issues - it seems like UseLayoutRounding="True" should help, but it didnt help for me.
Here is the code:
<Grid x:Name="LayoutRoot" UseLayoutRounding="True" Background="Transparent">
<controls:Panorama x:Name="mainPanorama" Title="life rpg" SelectionChanged="Panorama_SelectionChanged_1">
<controls:Panorama.Background>
<ImageBrush ImageSource="Imgs/bg.jpg"/>
</controls:Panorama.Background>
<controls:PanoramaItem Header="main" Tag="main" >
<StackPanel Name="mainPanel">
<StackPanel Orientation="Horizontal">
<Image HorizontalAlignment="Left" Height="165" VerticalAlignment="Top" Width="165" Source="picture.png" Margin="0 0 20 0"/>
<Image Name="swordImg" HorizontalAlignment="Left" Height="50" VerticalAlignment="Top" Width="50" Source="Imgs/swords/swordLVL1.png" Stretch="Fill" />
<Image Name="armorImg" HorizontalAlignment="Left" Height="100" VerticalAlignment="Top" Width="100" Source="Imgs/armors/armorLVL1.png" Stretch="Uniform" />
<Image Name="shieldImg" HorizontalAlignment="Left" Height="150" VerticalAlignment="Top" Width="150" Source="Imgs/shields/shieldLVL1.png" Stretch="UniformToFill" />
</StackPanel>
<!--LayoutRoot is the root grid where all page content is placed-->
If the quality of an image is important when displayed at a large size then you have 2 options.
Start with a large image. Bitmap images will suffer distortion when made larger. This will be amplified depending on the compression/quality setting used within a JPEG file.
Use an image in a vector format.
Given the low resolution of your image (given that it is raster format and not vector), you cannot upscale it without losing quality. No rendering options will help you here.
A 25x25 image for a Panorama background is definitely not enough quality-wise.
I have a StackPanel containing five images and I want to put a black border around each image.
The XAML I have at the moment is:
<Image Name="imgPic1"
Width="100"
Height="75"
Stretch="Fill"
VerticalAlignment="Top" />
I thought I would be just able to put a one-unit margin or padding on the image and set a background color to 000000 but Padding and Background are both invalid for images.
What is an easy way to do this in XAML? Do I really have to put each image inside another control to get a border around it or is there some other trickery I can use?
Simply wrap the Image in a Border control
<Border BorderThickness="1">
<Image Name="imgPic1"
Width="100"
Height="75"
Stretch="Fill"
VerticalAlignment="Top" />
</Border>
You could also provide a style you apply to images that does this if you don't want to do it around every image
Final solution from answer and comments added by Pax:
<Border BorderThickness="1"
BorderBrush="#FF000000"
VerticalAlignment="Top">
<Image Name="imgPic1"
Width="100"
Height="75"
Stretch="Fill"
VerticalAlignment="Top"/>
</Border>
The accepted answer will not work because of the problem described here
https://wpf.2000things.com/2011/04/17/279-adding-a-border-around-an-image-control/
I solved it this way.
<Viewbox>
<Border BorderThickness="3" BorderBrush="Red">
<Image Stretch="None" ></Image>
</Border>
</Viewbox>
I just stumbled upon this post and the other answer did not work right. Maybe because I now use framework 4 and this post is old?
In any case - if someone will see this by chance in the future - here is my answer:
<Border Name="brdSiteLogo"
BorderThickness="2"
BorderBrush="#FF000000"
VerticalAlignment="Top"
HorizontalAlignment="Left"
Margin="12,112,0,0"
Height="128"
Width="128">
<Image Name="imgSiteLogo"
HorizontalAlignment="Stretch"
VerticalAlignment="Stretch"
Stretch="Fill"/>
</Border>
The border thickness and brush are important (if you wont choose a color - you will not see the border!!!)
Also, the border should be aligned on your window. The image is "inside" the border, so you can use margins or just stretch it like I did.
Please pardon my ignorance- I'm very new to WPF.
I am looking to implement a minor, visual effect in my application that gives the look of "inner" rounded corners. The window in question has a dark border that encapsulates several UIElements, one of which is a StatusBar, located at the bottom of the window. This StatusBar has a dark background that matches the window's border. Above the StatusBar is a content view, which is currently a Grid- its background is semi-transparent (I think that this is something of a constraint- you can see through the content view to the desktop below). I would like for the content view (represented by the transparent, inner area in the figure below) to have the look of rounded corners, though I expect to have to sort of create the illusion myself.
(Can't post the image because I'm a lurker and not a poster- please find the drawing here)
My first approach was to add a Rectangle (filled with the same, dark color as the border) immediately above the StatusBar and to assign a Border with rounded corners to its OpacityMask (similar to the solution proposed by Chris Cavanagh**). Sadly, the effect that is produced is the exact opposite of that which I am trying to achieve.
I understand that the Clip property can be of use in this sort of situation, but it seems to me that using any sort of Geometry will prove to be inadequate as it won't be dynamically sized to the region in which it resides.
EDIT: Including my XAML:
<Grid Background="{StaticResource ClientBg}" Tag="{Binding OverlayVisible}" Style="{StaticResource mainGridStyle}">
<DockPanel LastChildFill="True">
<!-- Translates to a StackPanel with a Menu and a Button -->
<local:FileMenuView DockPanel.Dock="Top" />
<!-- Translates to a StatusBar -->
<local:StatusView DockPanel.Dock="Bottom" />
<!-- Translates to a Grid -->
<local:ContentView />
</DockPanel>
</Grid>
Any pointers are more than welcome- I'm ready to provide more indepth detail if necessary.
** http://www.dotnetkicks.com/wpf/WPF_easy_rounded_corners_for_anything
EDIT: Now I got what you mean. In fact you can use Path + OpacityMask approach. You have to draw "inverted" path, to use it as opacity mask. But I have simpler and faster solution for you :). Use Border + CornerRadius, and fill the gaps with solid paths. Just try the following code in Kaxaml and let me know if this is what you were looking for:
<Window
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Width="240"
Height="320"
AllowsTransparency="True"
Background="Transparent"
WindowStyle="None">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="24"/>
<RowDefinition Height="*"/>
<RowDefinition Height="24"/>
</Grid.RowDefinitions>
<Border Background="Black"/>
<Border Grid.Row="1" BorderBrush="Black" BorderThickness="5">
<Grid>
<Border Background="White" CornerRadius="0, 0, 5, 5" Opacity="0.7"/>
<Path
Width="15"
Height="15"
HorizontalAlignment="Left"
VerticalAlignment="Bottom"
Data="M10,10 L5,10 L5,5 C4.999,8.343 6.656,10 10,10 z"
Fill="Black"
Stretch="Fill"/>
<Path
Width="15"
Height="15"
HorizontalAlignment="Right"
VerticalAlignment="Bottom"
Data="M10,10 L5,10 L5,5 C4.999,8.343 6.656,10 10,10 z"
Fill="Black"
Stretch="Fill">
<Path.RenderTransform>
<TransformGroup>
<ScaleTransform ScaleX="-1"/>
<TranslateTransform X="15"/>
</TransformGroup>
</Path.RenderTransform>
</Path>
</Grid>
</Border>
<Border Grid.Row="2" Background="Black"/>
</Grid>
</Window>
PS: You can simplify this solution by avoiding render transforms, but you got the idea.
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>