DreamineComboBox.cs

이 파일의 문서화 페이지로 가기

using System.Drawing;
using System.Drawing.Drawing2D;
using Dreamine.UI.WinForms;
 
namespace Dreamine.UI.WinForms.Controls;

public class DreamineComboBox : UserControl
{
    private readonly ComboBox _inner;
    private bool _isFocused;
 
    // ── Properties ────────────────────────────────────────
    public ComboBox.ObjectCollection Items => _inner.Items;

    public object? SelectedItem
    {
        get => _inner.SelectedItem;
        set => _inner.SelectedItem = value;
    }

    public int SelectedIndex
    {
        get => _inner.SelectedIndex;
        set => _inner.SelectedIndex = value;
    }

    public override Color ForeColor
    {
        get => base.ForeColor;
        set { base.ForeColor = value; _inner.ForeColor = value; }
    }

    public new Font Font
    {
        get => base.Font;
        set { base.Font = value; _inner.Font = value; }
    }

    public event EventHandler? SelectedIndexChanged;
 
    // ── Constructor ───────────────────────────────────────
    public DreamineComboBox()
    {
        // _inner must be created first — SetStyle / property setters trigger
        // OnLayout and ForeColor/Font overrides before the field is otherwise set.
        _inner = new ComboBox
        {
            FlatStyle     = FlatStyle.Flat,
            BackColor     = DreamineTheme.InputBackground,
            ForeColor     = DreamineTheme.TextPrimary,
            Font          = new Font("Segoe UI", 10f, FontStyle.Regular, GraphicsUnit.Point),
            DropDownStyle = ComboBoxStyle.DropDownList,
        };
 
        _inner.GotFocus  += (_, _) => { _isFocused = true;  Invalidate(); };
        _inner.LostFocus += (_, _) => { _isFocused = false; Invalidate(); };
        _inner.SelectedIndexChanged += (s, e) => SelectedIndexChanged?.Invoke(this, e);
        _inner.DrawMode  = DrawMode.OwnerDrawFixed;
        _inner.DrawItem  += OnDrawItem;
 
        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(0, (Height - _inner.PreferredHeight) / 2,
            Width, _inner.PreferredHeight);
    }

    private void OnDrawItem(object? sender, DrawItemEventArgs e)
    {
        if (e.Index < 0) return;
        var isSelected = (e.State & DrawItemState.Selected) != 0;
        var isHover    = (e.State & DrawItemState.HotLight) != 0;
 
        var bg = isSelected
            ? DreamineTheme.AccentBlue
            : isHover
                ? Color.FromArgb(0xFF, 0x1E, 0x4A, 0x80)
                : DreamineTheme.InputBackground;
 
        using var bgBrush = new SolidBrush(bg);
        e.Graphics.FillRectangle(bgBrush, e.Bounds);
 
        string? text = _inner.Items[e.Index]?.ToString();
        if (!string.IsNullOrEmpty(text))
        {
            using var textBrush = new SolidBrush(DreamineTheme.TextPrimary);
            var sf = new StringFormat { LineAlignment = StringAlignment.Center };
            e.Graphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.ClearTypeGridFit;
            e.Graphics.DrawString(text, e.Font!, textBrush,
                new Rectangle(e.Bounds.X + 6, e.Bounds.Y, e.Bounds.Width - 6, e.Bounds.Height), sf);
        }
    }

    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(200, 36);
}