WPF application the same size for each scale in the system (regardless of scale)
Is there a way to make my WPF application the same for all system scales?
When I change the Resize text, apps and other items in Windows system settings from 125% (recommended) to 100% to Full-HD screen, my WPF app becomes too small. To implement an independent system scale application, I wrote a function like this to change the scaling of my application to 125%:
private void ScaleTo125Percents()
{
// Change scale of window content
MainContainer.LayoutTransform = new ScaleTransform(1.25, 1.25, 0, 0);
Width *= 1.25;
Height *= 1.25;
// Bring window center screen
var screenHeight = System.Windows.SystemParameters.PrimaryScreenHeight;
var screenWidth = System.Windows.SystemParameters.PrimaryScreenWidth;
Top = ( screenHeight - Height ) / 2;
Left = ( screenWidth - Width ) / 2;
}
But there are conditions for calling this function. The first of the screen should be Full-HD (there are APIs for this) and also the system scale should be 100% (there is no .NET API to get the system scale).
What can I do? Am I doing a standard way to make an independent app scale?
An example of scale independent applications I've seen:
- Visual Studio 2017 Installer
- Telegram desktop
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- Read the
AppliedDPI
dword registry located atComputer\HKEY_CURRENT_USER\Control Panel\Desktop\WindowMetrics
. Then divide it by 96. -
Or use this snippet:
double dpiFactor = System.Windows.PresentationSource.FromVisual(this).CompositionTarget.TransformToDevice.M11;
which returns a value between 1.0 and 2.5
Then create a config file that contains the application settings and set dpiFactor as the default scale. If the user prefers a custom scale, call this function when the window starts:
private void UserInterfaceCustomScale(double customScale)
{
// Change scale of window content
MainContainer.LayoutTransform = new ScaleTransform(customScale, customScale, 0, 0);
Width *= customScale;
Height *= customScale;
// Bring window center screen
var screenHeight = System.Windows.SystemParameters.PrimaryScreenHeight;
var screenWidth = System.Windows.SystemParameters.PrimaryScreenWidth;
Top = ( screenHeight - Height ) / 2;
Left = ( screenWidth - Width ) / 2;
}
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