ImageComboBox in DataGridView – .NET – Fórum – Programujte.com

Ahoj, mám takový problém ve funkci Paint ve třídě DataGridViewImageComboBoxColumnCell. Jde o to, že v proměnné nemám svůj objekt ImageComboBoxItem, ale je tam jen string, vybraná hodnota v ComboBoxu. Já bych potřeboval ale celou tu třídu, abych zjistil jaký ImageIndex je přiřazen k vybrané položce, abych mohl vykreslit daný obrázek. Jinak by to vše mělo fungovat. Součástí toho je i ImageComboBox normálně na formulář a ne do gridu a ten funguje bez problémů.
Díky moc za pomoc

using System;

using System.Drawing;

using System.Windows.Forms;



namespace Controls.ImageComboBox

{

  public class ImageComboBox : ComboBox

  {

    private ImageList _imgList = new ImageList();



    public ImageList ImageList

    {

      get { return _imgList; }

      set { _imgList = value; }

    }



    public ImageComboBox()

    {

      this.DrawMode = DrawMode.OwnerDrawFixed;

      this.DropDownStyle = ComboBoxStyle.DropDownList;

    }



    protected override void OnDrawItem(DrawItemEventArgs e)

    {

      e.DrawBackground();

      e.DrawFocusRectangle();



      ImageComboBoxItem item = new ImageComboBoxItem();



      try

      {

        item = (ImageComboBoxItem)this.Items[e.Index];

        int boundsLeft = e.Bounds.Left;



        if ((item.ImageIndex != -1) && (this.ImageList != null) && (item.ImageIndex < this.ImageList.Images.Count))

        {

          this.ImageList.Draw(e.Graphics, e.Bounds.Left, e.Bounds.Top, item.ImageIndex);

          boundsLeft += _imgList.ImageSize.Width;

        }



        e.Graphics.DrawString(item.DisplayText, e.Font, new SolidBrush(e.ForeColor), boundsLeft, e.Bounds.Top);

      }

      catch

      {

        e.Graphics.DrawString(this.Text, e.Font, new SolidBrush(e.ForeColor), e.Bounds.Left, e.Bounds.Top);

      }

      base.OnDrawItem(e);

    }

  }



  public class ImageComboBoxItem

  {

    private string _displayText;

    private object _value;

    private int _imageIndex;



    public string DisplayText

    {

      get { return _displayText; }

      set { _displayText = value; }

    }



    public object Value

    {

      get { return _value; }

      set { _value = value; }

    }



    public int ImageIndex

    {

      get { return _imageIndex; }

      set { _imageIndex = value; }

    }



    public ImageComboBoxItem()

    {

      this._displayText = String.Empty;

      this._value = String.Empty;

      this._imageIndex = -1;

    }



    public ImageComboBoxItem(string displayText)

    {

      this._displayText = displayText;

      this._value = displayText;

      this._imageIndex = -1;

    }



    public ImageComboBoxItem(string displayText, object value)

    {

      this._displayText = displayText;

      this._value = value;

      this._imageIndex = -1;

    }



    public ImageComboBoxItem(string displayText, int imageIndex)

    {

      this._displayText = displayText;

      this._value = displayText;

      this._imageIndex = imageIndex;

    }



    public ImageComboBoxItem(string displayText, object value, int imageIndex)

    {

      this._displayText = displayText;

      this._value = value;

      this._imageIndex = imageIndex;

    }

  }



  public class DataGridViewImageComboBoxColumn : DataGridViewComboBoxColumn

  {

    private ImageList _imgList = new ImageList();



    public ImageList ImageList

    {

      get { return _imgList; }

      set { _imgList = value; }

    }



    public DataGridViewImageComboBoxColumn()

    {

      this.CellTemplate = new DataGridViewImageComboBoxColumnCell();

    }

  }



  public class DataGridViewImageComboBoxColumnCell : DataGridViewComboBoxCell

  {

    public DataGridViewImageComboBoxColumnCell()

      : base()

    {

      this.DisplayMember = "DisplayText";

      //this.ValueMember = "Value";   

    }



    public override Type EditType

    {

      get { return typeof(DataGridViewImageComboBoxEditingControl); }

    }



    protected override object GetFormattedValue(object value, int rowIndex, ref DataGridViewCellStyle cellStyle, System.ComponentModel.TypeConverter valueTypeConverter, System.ComponentModel.TypeConverter formattedValueTypeConverter, DataGridViewDataErrorContexts context)

    {

      /*if (value != null)  

        return ((ImageComboBoxItem)value).DisplayText;  

      else  

        return String.Empty;*/

      return value;

    }



    public override Type ValueType

    {

      get { return typeof(ImageComboBoxItem); }

    }



    public override object DefaultNewRowValue

    {

      get { return new ImageComboBoxItem(); }

    }



    protected override void Paint(Graphics graphics,

                                    Rectangle clipBounds, Rectangle cellBounds, int rowIndex,

                                    DataGridViewElementStates elementState, object value,

                                    object formattedValue, string errorText,

                                    DataGridViewCellStyle cellStyle,

                                    DataGridViewAdvancedBorderStyle advancedBorderStyle,

                                    DataGridViewPaintParts paintParts)

    {

      formattedValue = null;



      base.Paint(graphics, clipBounds, cellBounds, rowIndex, elementState, value, formattedValue,

                 errorText, cellStyle, advancedBorderStyle, paintParts);





      Rectangle ImageBoxRect = new Rectangle();

      RectangleF TextBoxRect = new RectangleF();

      GetDisplayLayout(cellBounds, ref ImageBoxRect, ref TextBoxRect);

      ImageList il = ((DataGridViewImageComboBoxColumn)OwningColumn).ImageList;



      if ((paintParts & DataGridViewPaintParts.Background) == DataGridViewPaintParts.Background)

      {

        //value = this.DataGridView.CurrentCell.Value;   

        if (value != null && value.GetType() == typeof(ImageComboBoxItem))

        {

          int boundsLeft = cellBounds.Left;

          if ((((ImageComboBoxItem)value).ImageIndex != -1) && (((DataGridViewImageComboBoxColumn)OwningColumn).ImageList != null))

          {

            ((DataGridViewImageComboBoxColumn)OwningColumn).ImageList.Draw(graphics, cellBounds.X, cellBounds.Y, ((ImageComboBoxItem)value).ImageIndex);

            boundsLeft += ((DataGridViewImageComboBoxColumn)OwningColumn).ImageList.ImageSize.Width;

          }



          graphics.DrawString(((ImageComboBoxItem)value).DisplayText, cellStyle.Font, new SolidBrush(cellStyle.ForeColor), TextBoxRect);

        }

      }

    }



    protected virtual void GetDisplayLayout(Rectangle CellRect, ref Rectangle imageBoxRect, ref RectangleF textBoxRect)

    {

      const int DistanceFromEdge = 2;



      imageBoxRect.X = CellRect.X + DistanceFromEdge;

      imageBoxRect.Y = CellRect.Y + 1;

      imageBoxRect.Size = new Size((int)(1.5 * 17), CellRect.Height - (2 * DistanceFromEdge));



      textBoxRect = RectangleF.FromLTRB(imageBoxRect.X + imageBoxRect.Width + 5, imageBoxRect.Y + 2, CellRect.X + CellRect.Width - DistanceFromEdge, imageBoxRect.Y + imageBoxRect.Height);

    }



    public override void InitializeEditingControl(int rowIndex, object initialFormattedValue, DataGridViewCellStyle dataGridViewCellStyle)

    {

      base.InitializeEditingControl(rowIndex, initialFormattedValue, dataGridViewCellStyle);

      DataGridViewImageComboBoxEditingControl ctrl = DataGridView.EditingControl as DataGridViewImageComboBoxEditingControl;

      ctrl.ImageList = ((DataGridViewImageComboBoxColumn)OwningColumn).ImageList;

      if (ctrl.ImageList != null)

        ctrl.ItemHeight = ctrl.ImageList.ImageSize.Height;

    }

  }



  public class DataGridViewImageComboBoxEditingControl : DataGridViewComboBoxEditingControl

  {

    private ImageList _imgList = new ImageList();



    public ImageList ImageList

    {

      get { return _imgList; }

      set { _imgList = value; }

    }



    public DataGridViewImageComboBoxEditingControl()

      : base()

    {

      this.DrawMode = DrawMode.OwnerDrawFixed;

      this.DropDownStyle = ComboBoxStyle.DropDownList;

    }



    protected override void OnDrawItem(DrawItemEventArgs e)

    {

      e.DrawBackground();

      e.DrawFocusRectangle();



      ImageComboBoxItem item = new ImageComboBoxItem();

      if (e.Index != -1)

        item = (ImageComboBoxItem)this.Items[e.Index];



      if (item != null)

      {

        int boundsLeft = e.Bounds.Left;



        if ((item.ImageIndex != -1) && (_imgList != null) && (item.ImageIndex < _imgList.Images.Count))

        {

          _imgList.Draw(e.Graphics, e.Bounds.Left, e.Bounds.Top, item.ImageIndex);

          boundsLeft += _imgList.ImageSize.Width;

        }



        e.Graphics.DrawString(item.DisplayText, e.Font, new SolidBrush(e.ForeColor), boundsLeft, e.Bounds.Top);

      }

      else

        e.Graphics.DrawString(this.Text, e.Font, new SolidBrush(e.ForeColor), e.Bounds.Left, e.Bounds.Top);



      base.OnDrawItem(e);

    }

  }

}