42 lines
1.3 KiB
C#
42 lines
1.3 KiB
C#
/*
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* Copyright (c) 2019 ETH Zürich, Educational Development and Technology (LET)
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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using System.Windows;
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using System.Windows.Interop;
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using System.Windows.Media;
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namespace SafeExamBrowser.UserInterface.Desktop.Utilities
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{
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internal static class VisualExtensions
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{
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/// <summary>
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/// WPF works with device-independent pixels. This method is required to
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/// transform such values to their absolute, device-specific pixel value.
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/// Source: https://stackoverflow.com/questions/3286175/how-do-i-convert-a-wpf-size-to-physical-pixels
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/// </summary>
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internal static Vector TransformToPhysical(this Visual visual, double x, double y)
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{
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Matrix transformToDevice;
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var source = PresentationSource.FromVisual(visual);
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if (source != null)
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{
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transformToDevice = source.CompositionTarget.TransformToDevice;
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}
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else
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{
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using (var newSource = new HwndSource(new HwndSourceParameters()))
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{
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transformToDevice = newSource.CompositionTarget.TransformToDevice;
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}
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}
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return transformToDevice.Transform(new Vector(x, y));
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}
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}
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}
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