C# と VB.NET の質問掲示板

■No53581 (すなふきぬ さん) に返信
> 2010/09/19(Sun) 23:54:42 編集(投稿者)
> 2010/09/19(Sun) 21:23:27 編集(投稿者)

> #なんか知らないけど、荒らしとか言われるのも心外なので、ソース削除しておきます。

ちょっと来なかったら荒らしのカキコ削除されてた。
必要ないかもしれませんが、ソースだけ再UP。


public partial class Form1 : Form
{
	DataTable _dt;

	public Form1()
	{
		InitializeComponent();
		_dt = new DataTable();
		_dt.Columns.Add("Value", typeof(int));
		_dt.Columns.Add("Name", typeof(string));
		_dt.Columns.Add("canSelected", typeof(bool));
		for (int i = 0; i < 6; i++)
		{
			DataRow r = _dt.NewRow();
			r[0] = i;
			r[1] = string.Format("項目{0}", i + 1);
			r[2] = ((i % 2) == 1);
			_dt.Rows.Add(r);
		}
		this.comboBox1.ValueMember = "Value";
		this.comboBox1.DisplayMember = "Name";
		this.comboBox1.DataSource = _dt;
		this.comboBox1.DropDownStyle = ComboBoxStyle.DropDownList;
		this.comboBox1.DrawMode = DrawMode.OwnerDrawFixed;
		this.comboBox1.DrawItem += new DrawItemEventHandler(comboBox1_DrawItem);
		this.comboBox1.SelectedIndexChanged += new EventHandler(comboBox1_SelectedIndexChanged);
	}

	void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
	{
		if (!this.Created) return;
		DataRowView drv = (DataRowView)this.comboBox1.SelectedItem;
		bool isSelected = (bool)drv.Row["canSelected"];
		if (!isSelected) this.comboBox1.DroppedDown = true;
	}

	void comboBox1_DrawItem(object sender, DrawItemEventArgs e)
	{
		if (e.Index < 0) return;

		DataRowView drv = (DataRowView)((ComboBox)sender).Items[e.Index];
		string name = drv.Row["Name"].ToString();
		bool canSelected = (bool)drv.Row["canSelected"];
		bool isHilight = this.isActiveEditItem(e.State) | this.isHoverItem(e.State);

		Brush brFore = (isHilight & canSelected) ? 
			SystemBrushes.ControlLightLight: 
			SystemBrushes.ControlText;
		Brush brBack = !canSelected ? 
			SystemBrushes.ControlLight : 
			(isHilight ? 
				SystemBrushes.Highlight : 
				SystemBrushes.ControlLightLight
			);
		e.Graphics.FillRectangle(brBack, e.Bounds);

		int drawOffsetX = e.Bounds.X + (canSelected ? 10 : 0);
		Font fnt = new Font(((Control)sender).Font, (canSelected ? FontStyle.Regular : FontStyle.Bold));
		e.Graphics.DrawString(name, fnt, brFore, drawOffsetX, e.Bounds.Y + 1);

		if (isHilight & canSelected)
		{
			using (Pen p = new Pen(Color.FromArgb(SystemColors.Highlight.ToArgb() ^ 0x00FFFFFF)))
			{
				p.DashStyle = DashStyle.Dot;
				Rectangle rct = e.Bounds;
				rct.Height--;
				rct.Width--;
				e.Graphics.DrawRectangle(p, rct);
			}
		}
	}

	public bool isActiveEditItem(DrawItemState state)
	{
		return ((state & DrawItemState.Selected) == DrawItemState.Selected) &&
			((state & DrawItemState.Focus) == DrawItemState.Focus) &&
			((state & DrawItemState.ComboBoxEdit) == DrawItemState.ComboBoxEdit);
	}

	public bool isHoverItem(DrawItemState state)
	{
		return ((state & DrawItemState.Selected) == DrawItemState.Selected) &&
			((state & DrawItemState.Focus) == DrawItemState.Focus);
	}
}