I try to display really huge(4k * 120k or larger like 4k * 300k) images in an Image control in WPF.
Although it's only displaying the first part of the image correctly, around 33k row, the display becomes garbage(black in this case, but it's dependent on the image).
The XAML code for the image control.
View is a BitmapImage and setting the DecodePixelHeight won't help either.
<Grid>
<Grid.RowDefinitions>
<RowDefinition/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition />
</Grid.ColumnDefinitions>
<ScrollViewer
Grid.Row="0"
Grid.Column="0"
HorizontalScrollBarVisibility="Auto"
VerticalScrollBarVisibility="Auto" >
<Image VerticalAlignment="Top" HorizontalAlignment="Left" x:Name="viewImage"
Source="{Binding View}" />
</ScrollViewer>
Am i doing something wrong, or there is a limitation in the size of the Image control?
As Clemens mentioned, BitmapSource has a 2^16 limit in dimensions.
link
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I am designing a Windows Phone application and I would like to stack a TextBlock and a Button next to each other horizontally. This is my pseudo-code on what I would like to achieve:
<StackPanel Name="titlePanel" Orientation="Horizontal" Margin="0,-6.5,0,26.5">
<TextBlock Name="titleBox" Text="{Binding Title}" Style="{ThemeResource HeaderTextBlockStyle}" CharacterSpacing="{ThemeResource PivotHeaderItemCharacterSpacing}"/>
<Button Content="press" Width="whatever space is left" Length="what the width is"/> <!--how do I do this?-->
</StackPanel>
I got an error when I tried to put Width="*", so I'm looking to do something like Width="titlePanel.Width - titleBox.Width" and Length="this.Width", only I can't seem to be able to reference other objects inside XAML. I don't want to put into the code-behind file to format the size of the Button every time that page comes up... how would this be achieved?
You can't do it with StackPanel because, the stack panel measures every child element with positive infinity as the constraint for the axis that it is stacking elements along. The child controls have to return how big they want to be (positive infinity is not a valid return from the MeasureOverride in either axis) so they return the smallest size where everything will fit. They have no way of knowing how much space they really have to fill.
So you should use grid to achieve desired behavior.
You can use grid control for this kind of purpose
try this one
<Grid HorizontalAlignment="Stretch">
<Grid.RowDefinitions>
<RowDefinition Height="auto"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<TextBlock Name="titleBox" Grid.Column="0" Margin="5,0" HorizontalAlignment="Stretch" TextWrapping="Wrap" Text="Your text goes here." />
<Button Content="press" Grid.Column="1" Margin="5,0" HorizontalAlignment="Stretch"/>
</Grid>
Hope this helps.
Been looking around on the internet and I think more people talk about docking images etc... to the screen. What I am looking for is that I want the images and everything else on the page to stretch or shrink depending on the persons resolution?
I Havant set my screen to a height or width, I just set the screen to maximise on page load but this doesn't seem to work?
Does anyone have a solutions on this i am using a WPF Application.
You can put all your controls below the Window in a ViewBox. That will scale your whole window content.
While the ViewBox control is good for resizing UI elements, there is a preferable way to achieve the same goal. UIs in WPF are generally created using Grid controls. These enable developers to take advantage of the resizing abilities that they provide. Virtually all 'fit to size' applications use Grid elements.
When using Grid elements with the objective of filling all of the available space, there are a few things that you should consider. You generally shouldn't use exact widths and/or heights, instead using the "Auto" setting. Also, you must have at least one column and/or width dimension set to "*"... this will take up all of the remaining space:
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<TextBlock Grid.Row="0" Grid.Column="0" Text="Top left" Background="LightSeaGreen" Padding="20" />
<TextBlock Grid.Row="1" Grid.Column="0" Text="Bottom left" Background="LightBlue" Padding="20" />
<TextBlock Grid.Row="0" Grid.Column="1" Text="Top right" Background="LightGreen" Padding="20" />
<TextBlock Grid.Row="1" Grid.Column="1" Text="Bottom left" Background="LightCoral" Padding="20" />
</Grid>
I've tried almost every combination of alignments and margins, to no success. The ListBox is on a WPF page, which is bound to a frame on the main window.
The ListBox itself is fine. It aligns just as I expect it would. My ListBoxItem contains an Image and a TextBlock. The TextBlock gets cut off.
As you can see from the following image, things are mostly good.
The ListBox is appropriately offset from the left edge and the top of that blue box. The content Image and TextBlock are fairly centered and so is the ListBoxItem outline. This is on my development machine.
I thought the whole reason for using grids, grid lines, and alignment properties, was so we didn't have to set a hard coded size. That our controls would resize themselves. Which does actually work just fine for everything else.
But when I place this on a small screen, I get this:
The ListBox itself is still aligned correctly. But now the ListBoxItem is forced down. It's top alignment is still good, but the bottom is pushed down so we can't see the TextBlock or the bottom of the ListBoxItem.
Here's my XAML:
<Grid VerticalAlignment="Stretch" HorizontalAlignment="Stretch" Margin="1">
<Grid.RowDefinitions>
<RowDefinition Height="292*" />
<RowDefinition Height="30*"/>
</Grid.RowDefinitions>
<ListBox Grid.Row="1" Name="lbButtons" Margin="2,0,0,1.5" VerticalAlignment="Stretch" HorizontalAlignment="Stretch" Visibility="Visible" >
<StackPanel Name="spListBoxItems" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Orientation="Horizontal">
<ListBoxItem Margin="0,0,0,0" VerticalAlignment="Stretch" HorizontalAlignment="Stretch" >
<StackPanel Orientation="Vertical" HorizontalAlignment="Center" Margin="10,5,10,5">
<Image Source="/COBAN.CobanConsole.UI;component/Images/Buttons/Light/record48_light.png" />
<TextBlock Text="Record" Margin="5,5,0,0"></TextBlock>
</StackPanel>
</ListBoxItem>
</StackPanel>
</ListBox>
</Grid>
Not much to it. Any ideas on what's going on?
You're using * units on your grid row definitions. Those are relative measures: they just tell you what proportion of the space the rows can take up. If you need your listbox to have a specific height, you should change your second row to have an absolute size instead, like this:
<Grid.RowDefinitions>
<RowDefinition Height="*" />
<RowDefinition Height="30"/>
</Grid.RowDefinitions>
I have a grid with 2 columns and 2 rows. A single character (Unicode U+2699) was placed inside the bottom right grid field. It looks like this:
I´d like the character to automatically adjust its font size to fit the grid field it has been placed in (in this case it should be bound to the height of the second grid row, but since in some cases it could be unclear if the height or the width of the grid is smaller, it would be also nice to know how to bind to the lowest of those 2 values).
My implementation so far is something like the following (I simplified it a bit for this example):
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition x:Name="heightToBind" Height="40"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="14*" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<Button FontSize="{Binding ElementName=heightToBind, Path=Height.Value, Mode=OneWay}" Content="⚙" Grid.Row="1" Grid.Column="1" HorizontalAlignment="Right" />
</Grid>
The problem here is, that it only works if the height is a fixed value inside the RowDefinitions. I want it to work with the following definition:
<Grid.RowDefinitions>
<RowDefinition Height="4*"/>
<RowDefinition x:Name="heightToBind" Height="*"/>
</Grid.RowDefinitions>
As a bonus question I´d also be interested why it might be that the character is placed too low so it is getting cut off at the bottom (I tried VerticalAlignment="Center" for the button but with no effect).
You can try using a ViewBox as the button's content:
<Button Grid.Row="1" Grid.Column="1">
<Button.Content>
<Viewbox StretchDirection="Both" HorizontalAlignment="Stretch">
<TextBlock Text="⚙" />
</Viewbox>
</Button.Content>
</Button>
A ViewBox can stretch and scale his child to fill all the available space...
You could try binding to the ActualHeight instead of the Height:
<Button FontSize="{Binding ElementName=heightToBind, Path=ActualHeight.Value, Mode=OneWay}"
Content="⚙" Grid.Row="1" Grid.Column="1" HorizontalAlignment="Right" />
This should work.
The * on the grid definition means take the available space as the height so it's only determined when the page layout has been prepared for layout. If the height is either unset or changed then the real height is returned in the ActualHeight property.
Looked around to find a way to resize bind with the windows resize without explicitly telling my object to grab the windows size.
Here is the code:
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<WindowsFormsHost Background="{x:Null}" Grid.Row="0" Grid.Column="0" HorizontalAlignment="Left" Name="windowsFormsHost1" VerticalAlignment="Top" Margin="-1,0,0,0">
<wf:Panel x:Name="pnlLivePreview" />
</WindowsFormsHost>
</Grid>
This was followed by the example showed here
Edit: Question: Why doesn't panel resize with the window ?
Simply remove the explicit Width and Height settings, and the HorizontalAlignment and VerticalAlignment settings, thus:
<WindowsFormsHost Background="{x:Null}"
Name="windowsFormsHost1"
Margin="-1,0,0,0">
<wf:Panel x:Name="pnlLivePreview" />
</WindowsFormsHost>
I'm going to throw a wild guess here, but since this is a WinForms panel, try setting it's Dock property to Fill thus:
<wf:Panel x:Name="pnlLivePreview" Dock="Fill" />
Really not sure it would work, if it doesn't work in markup, try doing it in code.
Bind your Height/Width to your window's height/width
<Window x:Name="Root_Window">
<Grid Height="{Binding ElementName=RootWindow, Path=ActualHeight}"
Width="{Binding ElementName=RootWindow, Path=ActualWidth}">
<!-- Content Here -->
</Grid>
</Window>
The answer: Problem is not the panel but the api used to create the content of it.