ToolStripDropDownButton.cs :  » 2.6.4-mono-.net-core » System.Windows.Forms » System » Windows » Forms » C# / CSharp Open Source

//
// ToolStripDropDownButton.cs
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
// Copyright (c) 2006 Jonathan Pobst
//
// Authors:
//  Jonathan Pobst (monkey@jpobst.com)
//

#if NET_2_0
using System.Drawing;
using System.Runtime.InteropServices;
using System.Windows.Forms.Design;
using System.ComponentModel;

namespace System.Windows.Forms{
  [ToolStripItemDesignerAvailability (ToolStripItemDesignerAvailability.ToolStrip | ToolStripItemDesignerAvailability.StatusStrip)]
  public class ToolStripDropDownButton : ToolStripDropDownItem
  {
    private bool show_drop_down_arrow = true;

    #region Public Constructors
    public ToolStripDropDownButton()
      : this (string.Empty, null, null, string.Empty)
    {
    }
    
    public ToolStripDropDownButton (Image image)
      : this (string.Empty, image, null, string.Empty)
    {
    }
    
    public ToolStripDropDownButton (string text)
      : this (text, null, null, string.Empty)
    {
    }
    
    public ToolStripDropDownButton (string text, Image image)
      : this (text, image, null, string.Empty)
    {
    }
    
    public ToolStripDropDownButton (string text, Image image, EventHandler onClick)
      : this (text, image, onClick, string.Empty)
    {
    }
    
    public ToolStripDropDownButton (string text, Image image, params ToolStripItem[] dropDownItems)
      : base (text, image, dropDownItems)
    {
    }
    
    public ToolStripDropDownButton (string text, Image image, EventHandler onClick, string name)
      : base (text, image, onClick, name)
    {
    }
    #endregion

    #region Public Properties
    [DefaultValue (true)]
    public new bool AutoToolTip {
      get { return base.AutoToolTip; }
      set { base.AutoToolTip = value; }
    }
    
    [DefaultValue (true)]
    public bool ShowDropDownArrow {
      get { return this.show_drop_down_arrow; }
      set { 
        if (this.show_drop_down_arrow != value) {
          this.show_drop_down_arrow = value;
          CalculateAutoSize ();
        }
      }
    }
    #endregion

    #region Protected Properties
    protected override bool DefaultAutoToolTip {
      get { return true; }
    }
    #endregion

    #region Protected Methods
    protected override ToolStripDropDown CreateDefaultDropDown ()
    {
      ToolStripDropDownMenu tsdd = new ToolStripDropDownMenu ();
      tsdd.OwnerItem = this;
      return tsdd;
    }

    protected override void OnMouseDown (MouseEventArgs e)
    {
      if (e.Button == MouseButtons.Left) {
        if (this.DropDown.Visible)
          this.HideDropDown (ToolStripDropDownCloseReason.ItemClicked);
        else
          this.ShowDropDown ();
      }
      
      base.OnMouseDown (e);
    }

    protected override void OnMouseLeave (EventArgs e)
    {
      base.OnMouseLeave (e);
    }

    protected override void OnMouseUp (MouseEventArgs e)
    {
      base.OnMouseUp (e);
    }
    
    protected override void OnPaint (PaintEventArgs e)
    {
      base.OnPaint (e);

      if (this.Owner != null) {
        Color font_color = this.Enabled ? this.ForeColor : SystemColors.GrayText;
        Image draw_image = this.Enabled ? this.Image : ToolStripRenderer.CreateDisabledImage (this.Image);

        this.Owner.Renderer.DrawDropDownButtonBackground (new System.Windows.Forms.ToolStripItemRenderEventArgs (e.Graphics, this));

        Rectangle text_layout_rect;
        Rectangle image_layout_rect;

        this.CalculateTextAndImageRectangles (out text_layout_rect, out image_layout_rect);

        if (text_layout_rect != Rectangle.Empty)
          this.Owner.Renderer.DrawItemText (new System.Windows.Forms.ToolStripItemTextRenderEventArgs (e.Graphics, this, this.Text, text_layout_rect, font_color, this.Font, this.TextAlign));
        if (image_layout_rect != Rectangle.Empty)
          this.Owner.Renderer.DrawItemImage (new System.Windows.Forms.ToolStripItemImageRenderEventArgs (e.Graphics, this, draw_image, image_layout_rect));
        if (this.ShowDropDownArrow)
          this.Owner.Renderer.DrawArrow (new ToolStripArrowRenderEventArgs (e.Graphics, this, new Rectangle (this.Width - 10, 0, 6, this.Height), Color.Black, ArrowDirection.Down));
        return;
      }
    }

    protected internal override bool ProcessMnemonic (char charCode)
    {
      if (!this.Selected)
        this.Parent.ChangeSelection (this);

      if (this.HasDropDownItems)
        this.ShowDropDown ();
      else
        this.PerformClick ();

      return true;
    }
    #endregion

    #region Internal Methods
    internal override Size CalculatePreferredSize (Size constrainingSize)
    {
      Size preferred_size = base.CalculatePreferredSize (constrainingSize);

      if (this.ShowDropDownArrow)
        preferred_size.Width += 9;

      return preferred_size;
    }
    #endregion
  }
}
#endif