ScreenToGif/Util/Other.cs

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using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Windows;
using System.Windows.Interop;
using System.Windows.Media;
using ScreenToGif.FileWriters;
using ScreenToGif.Util.Model;
using SaveFileDialog = Microsoft.Win32.SaveFileDialog;

namespace ScreenToGif.Util
{
    /// <summary>
    /// Other helper methods.
    /// </summary>
    public static class Other
    {
        public static Point TransformToScreen(Point point, Visual relativeTo)
        {
            var hwndSource = PresentationSource.FromVisual(relativeTo) as HwndSource;
            var root = hwndSource.RootVisual;

            // Translate the point from the visual to the root.
            var transformToRoot = relativeTo.TransformToAncestor(root);

            var pointRoot = transformToRoot.Transform(point);

            // Transform the point from the root to client coordinates.
            var m = Matrix.Identity;

            var transform = VisualTreeHelper.GetTransform(root);

            if (transform != null)
            {
                m = Matrix.Multiply(m, transform.Value);
            }

            var offset = VisualTreeHelper.GetOffset(root);
            m.Translate(offset.X, offset.Y);

            var pointClient = m.Transform(pointRoot);

            // Convert from “device-independent pixels” into pixels.
            pointClient = hwndSource.CompositionTarget.TransformToDevice.Transform(pointClient);

            var pointClientPixels = new Native.PointW();
            pointClientPixels.X = (0 < pointClient.X) ? (int)(pointClient.X + 0.5) : (int)(pointClient.X - 0.5);
            pointClientPixels.Y = (0 < pointClient.Y) ? (int)(pointClient.Y + 0.5) : (int)(pointClient.Y - 0.5);

            // Transform the point into screen coordinates.
            var pointScreenPixels = pointClientPixels;
            Native.ClientToScreen(hwndSource.Handle, ref pointScreenPixels);

            //Native.GetCurrentPositionEx(hwndSource.Handle, out pointScreenPixels);
            //Native.GetWindowOrgEx(hwndSource.Handle, out pointScreenPixels);

            return new Point(pointScreenPixels.X, pointScreenPixels.Y);
        }