DreaminePasswordBox.cs

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using System.Drawing;
using System.Runtime.InteropServices;
using Dreamine.UI.WinForms;
 
namespace Dreamine.UI.WinForms.Controls;

public class DreaminePasswordBox : UserControl
{
    private const int EM_SETCUEBANNER = 0x1501;
    [DllImport("user32.dll", CharSet = CharSet.Unicode)]
    private static extern IntPtr SendMessage(IntPtr hWnd, int msg, IntPtr wParam, string lParam);

    private readonly TextBox _inner;
    private bool _isFocused;
 
    // ── Properties ────────────────────────────────────────
    public string Password
    {
        get => _inner.Text;
        set => _inner.Text = value;
    }

    private string _hint = string.Empty;
    public string Hint
    {
        get => _hint;
        set
        {
            _hint = value;
            if (_inner.IsHandleCreated)
                SendMessage(_inner.Handle, EM_SETCUEBANNER, (IntPtr)1, _hint);
        }
    }

    public override Color ForeColor
    {
        get => base.ForeColor;
        set { base.ForeColor = value; if (_inner != null) _inner.ForeColor = value; }
    }

    public new Font Font
    {
        get => base.Font;
        set { base.Font = value; if (_inner != null) _inner.Font = value; }
    }

    public event EventHandler? PasswordChanged;
 
    // ── Constructor ───────────────────────────────────────
    public DreaminePasswordBox()
    {
        // _inner must be created first — SetStyle and property setters below
        // can trigger OnLayout / ForeColor / Font overrides before the field is set.
        _inner = new TextBox
        {
            BorderStyle          = BorderStyle.None,
            BackColor            = DreamineTheme.InputBackground,
            ForeColor            = DreamineTheme.TextPrimary,
            Font                 = new Font("Segoe UI", 10f, FontStyle.Regular, GraphicsUnit.Point),
            UseSystemPasswordChar = true,
        };
 
        _inner.GotFocus  += (_, _) => { _isFocused = true;  Invalidate(); };
        _inner.LostFocus += (_, _) => { _isFocused = false; Invalidate(); };
        _inner.TextChanged += (s, e) => PasswordChanged?.Invoke(this, e);
        _inner.HandleCreated += (_, _) =>
        {
            if (!string.IsNullOrEmpty(_hint))
                SendMessage(_inner.Handle, EM_SETCUEBANNER, (IntPtr)1, _hint);
        };
 
        SetStyle(
            ControlStyles.AllPaintingInWmPaint |
            ControlStyles.UserPaint |
            ControlStyles.DoubleBuffer |
            ControlStyles.ResizeRedraw, true);
 
        BackColor = DreamineTheme.InputBackground;
        ForeColor = DreamineTheme.TextPrimary;
        Font      = _inner.Font;
        Height    = 36;
 
        Controls.Add(_inner);
    }

    protected override void OnLayout(LayoutEventArgs e)
    {
        base.OnLayout(e);
        if (_inner == null) return;
        _inner.SetBounds(6, (Height - _inner.PreferredHeight) / 2,
            Width - 12, _inner.PreferredHeight);
    }

    protected override void OnPaint(PaintEventArgs e)
    {
        var g    = e.Graphics;
        var rect = new Rectangle(0, 0, Width - 1, Height - 1);
        using var bgBrush = new SolidBrush(BackColor);
        var borderColor = _isFocused ? DreamineTheme.BorderFocus : DreamineTheme.BorderNormal;
        using var pen = new Pen(borderColor, 1.5f);
        DreamineDrawHelper.FillRoundedRect(g, bgBrush, pen, rect, DreamineTheme.CornerRadiusSmall);
    }

    protected override Size DefaultSize => new(220, 36);
}