DreamineVirtualKeyboardAssist.cs

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using System.Windows.Forms;
using Dreamine.UI.WinForms.Controls;
 
namespace Dreamine.UI.WinForms.VirtualKeyboard;

public static class DreamineVirtualKeyboardAssist
{
    private static readonly Dictionary<DreamineTextBox, DreamineVirtualKeyboardForm> _open = new();

    public static void Attach(DreamineTextBox textBox, VkLayout layout = VkLayout.Text)
    {
        textBox.Enter += (_, _) => Show(textBox, layout);
    }

    public static void Detach(DreamineTextBox textBox)
    {
        if (_open.TryGetValue(textBox, out var form))
        {
            form.Close();
            _open.Remove(textBox);
        }
    }

    private static void Show(DreamineTextBox textBox, VkLayout layout)
    {
        if (_open.ContainsKey(textBox))
            return;
 
        var screenLocation = textBox.Parent?.PointToScreen(textBox.Location) ?? Cursor.Position;
        var form = new DreamineVirtualKeyboardForm(textBox, layout);
        var workingArea = Screen.FromControl(textBox).WorkingArea;
        var x = Math.Clamp(screenLocation.X, workingArea.Left, Math.Max(workingArea.Left, workingArea.Right - form.Width));
        var y = screenLocation.Y + textBox.Height + 4;
        if (y + form.Height > workingArea.Bottom)
            y = Math.Max(workingArea.Top, screenLocation.Y - form.Height - 4);
 
        form.Location = new System.Drawing.Point(x, y);
        form.FormClosed += (_, _) => _open.Remove(textBox);
 
        _open[textBox] = form;
        form.Show();
    }
}