C# ToolStripDropDown.Close方法代码示例

 protected override void OnHandleCreated(EventArgs e)
 {
     base.OnHandleCreated(e);
     _dropDown = new ToolStripDropDown();
     _box = new ListBox();
     _box.Width = this.Width - 2;
     _box.KeyDown += (KeyEventHandler)((sender, k) =>
     {
         if (k.KeyCode == Keys.Enter)
         {
             this.Text = _box.SelectedItem.ToString();
             _dropDown.Close();
         }
         _dropDown.AutoClose = true;
         if (k.KeyCode == Keys.Escape)
             _dropDown.Close();
     });
     _box.Click += (EventHandler)((sender, arg) =>
         {
             this.Text = _box.SelectedItem.ToString();
             _dropDown.Close();
         });
     _box.MouseMove += (MouseEventHandler)((sender, m) =>
     {
         int index = _box.IndexFromPoint(m.Location);
         _box.SelectedIndex = index;
     });
     ToolStripControlHost host = new ToolStripControlHost(_box);
     host.AutoSize = false;
     host.Margin = Padding.Empty;
     host.Padding = Padding.Empty;
     _dropDown.Items.Add(host);
     _dropDown.Height = _box.Height;
     _dropDown.AutoSize = false;
     _dropDown.Margin = Padding.Empty;
     _dropDown.Padding = Padding.Empty;
     _dropDown.Size = host.Size = _box.Size;
     _dropDown.AutoClose = false;
 }

 protected override void OnHandleCreated(EventArgs e)
 {
     base.OnHandleCreated(e);
     _dropDown = new ToolStripDropDown();
     _box = new ListBox();
     _box.Width = Width;
     _box.Click += (sender, arg) =>
     { Text = _box.SelectedItem as string; _dropDown.Close(); };
     ToolStripControlHost host = new ToolStripControlHost(_box);
     host.AutoSize = false;
     host.Margin = Padding.Empty;
     host.Padding = Padding.Empty;
     _dropDown.Items.Add(host);
     _dropDown.Height = _box.Height;
     _dropDown.AutoSize = false;
     _dropDown.Margin = Padding.Empty;
     _dropDown.Padding = Padding.Empty;
     _dropDown.Size = host.Size = _box.Size;
 }

        public override bool OnClick(System.Windows.Forms.Control container, System.Windows.Forms.MouseEventArgs evnt, System.Drawing.Drawing2D.Matrix viewTransform)
		{
			base.OnClick(container, evnt, viewTransform);

            if (evnt.Button == System.Windows.Forms.MouseButtons.Left)
            {
                var basePts = new PointF[] { 
                    new PointF(Node.bounds.Left + GraphConstants.HorizontalSpacing, bounds.Top), 
                    new PointF(Node.bounds.Right + GraphConstants.HorizontalSpacing - GraphConstants.NodeExtraWidth, bounds.Bottom) };
                viewTransform.TransformPoints(basePts);

                var dropDownCtrl = new ListBox();
                dropDownCtrl.BorderStyle = BorderStyle.None;
                dropDownCtrl.Margin = new Padding(0);
                dropDownCtrl.Padding = new Padding(0);

                dropDownCtrl.DrawMode = DrawMode.OwnerDrawVariable;
                dropDownCtrl.DrawItem +=
                    (object sender, DrawItemEventArgs e) =>
                    {
                        var lb = sender as ListBox;
                        var item = lb.Items[e.Index];

                        bool selectedState = e.State != DrawItemState.None;

                        // We have to draw the background every item, because the control 
                        // background isn't refreshed on state changes
                        e.Graphics.FillRectangle(selectedState ? Brushes.Gray : BackgroundBrush, e.Bounds);
                        e.Graphics.DrawString(
                            item.ToString(), SystemFonts.MenuFont, selectedState ? Brushes.Black : Brushes.White,
                            e.Bounds, GraphConstants.LeftTextStringFormat);
                    };

                dropDownCtrl.MeasureItem +=
                    (object sender, MeasureItemEventArgs e) =>
                    {
                        var lb = sender as ListBox;
                        var item = lb.Items[e.Index];
                        var size = new Size(GraphConstants.MinimumItemWidth, GraphConstants.MinimumItemHeight);
                        var textSize = e.Graphics.MeasureString(
                            item.ToString(), SystemFonts.MenuFont,
                            size, GraphConstants.LeftMeasureTextStringFormat);
                        e.ItemWidth = (int)textSize.Width;
                        e.ItemHeight = (int)textSize.Height;
                    };

                dropDownCtrl.BackColor = Color.FromArgb(96, 96, 96);

                dropDownCtrl.Items.AddRange(Items);
                dropDownCtrl.SelectedIndex = SelectedIndex;
                
                var toolDrop = new ToolStripDropDown();
                var toolHost = new ToolStripControlHost(dropDownCtrl);
                toolHost.Margin = new Padding(0);
                toolDrop.Padding = new Padding(0);
                toolDrop.Items.Add(toolHost);

                // Unfortunately the AutoSize functionality for toolHost just doesn't
                // work with an owner draw list box... Perhaps MeasureItem isn't called
                // until the list box is first drawn -- but that is after the tool host
                // has done it's auto size
                toolHost.AutoSize = false;
                toolHost.Size = new Size((int)(basePts[1].X - basePts[0].X), dropDownCtrl.PreferredHeight + 20);
                
                dropDownCtrl.SelectedIndexChanged +=
                    (object sender, System.EventArgs e) =>
                    {
                        var lb = sender as ListBox;
                        if (lb != null)
                            SelectedIndex = lb.SelectedIndex;
                        toolDrop.Close();
                    };

                toolDrop.Show(container, new Point((int)basePts[0].X, (int)basePts[1].Y + 4));
                return true;
            }

            return false;
		}