/// <summary>
/// Change the mouse pointer to a hand when the mouse moves over the image
/// </summary>
/// <param name="e">The event arguments</param>
protected override void OnMouseMove(DataGridViewCellMouseEventArgs e)
{
ImageListColumn owner = base.OwningColumn as ImageListColumn;
Rectangle content = base.GetContentBounds(e.RowIndex);
Cursor newCursor;
base.OnMouseMove(e);
// Figure out if the mouse is actually over the image
if (owner != null && owner.ImageList != null && !base.ReadOnly)
{
newCursor = owner.OriginalCursor;
if (content.Contains(e.Location))
{
newCursor = Cursors.Hand;
}
// Update the cursor if necessary
if (newCursor != null && base.DataGridView != null && base.DataGridView.Cursor != newCursor)
{
base.DataGridView.Cursor = newCursor;
}
}
}
//=====================================================================
/// <summary>
/// This is used to clone the column
/// </summary>
/// <returns>A clone of the column</returns>
public override object Clone()
{
ImageListColumn clone = (ImageListColumn)base.Clone();
clone.ImageList = images;
clone.NullImage = this.NullImage;
clone.NullImageIndex = this.NullImageIndex;
clone.NewRowImageIndex = this.NewRowImageIndex;
return clone;
}
/// <summary>
/// Change the mouse cursor back to the default when leaving the cell
/// </summary>
/// <param name="rowIndex">The row index of the cell</param>
protected override void OnMouseLeave(int rowIndex)
{
ImageListColumn owner = base.OwningColumn as ImageListColumn;
if (owner != null && base.DataGridView.Cursor != owner.OriginalCursor)
{
base.DataGridView.Cursor = owner.OriginalCursor;
}
base.OnMouseLeave(rowIndex);
}
/// <summary>
/// Gets the image to display in the cell
/// </summary>
/// <param name="value">The value to be use in determining the image</param>
/// <param name="rowIndex">The index of the cell's parent row</param>
/// <returns>The image that should be displayed in the cell</returns>
protected override object GetCellImage(object value, int rowIndex)
{
// Use the image from the image list
ImageListColumn owner = base.OwningColumn as ImageListColumn;
Image cellImage = null;
int cellValue = -1;
if (owner != null && owner.ImageList != null)
{
if (value is int)
{
cellValue = (int)value;
}
else
if (value is short)
{
cellValue = (short)value;
}
else
if (value is bool)
{
cellValue = ((bool)value) ? 1 : 0;
}
// Let the user map the value to an index
MapIndexEventArgs mapArgs = new MapIndexEventArgs(owner.Index, rowIndex, value, cellValue);
owner.OnMapValueToIndex(mapArgs);
cellValue = mapArgs.Index;
if (cellValue < 0 || cellValue >= owner.ImageList.Images.Count)
{
cellValue = owner.NullImageIndex;
if (cellValue >= owner.ImageList.Images.Count)
{
cellValue = -1;
}
}
if (cellValue != -1)
{
cellImage = owner.ImageList.Images[cellValue];
}
else
{
cellImage = owner.NullImage;
}
}
return(cellImage);
}
/// <summary>
/// This is overridden to cycle through the image index values when the cell is clicked and the cell is
/// editable.
/// </summary>
/// <param name="e">The event arguments</param>
protected override void OnContentClick(DataGridViewCellEventArgs e)
{
ImageListColumn owner = base.OwningColumn as ImageListColumn;
int cellValue = -1;
object newValue = base.NewValue;
if (!base.ReadOnly && base.DataGridView != null && owner != null && owner.ImageList != null)
{
if (newValue is int)
{
cellValue = (int)newValue;
}
else
if (newValue is short)
{
cellValue = (short)newValue;
}
else
if (newValue is bool)
{
cellValue = ((bool)newValue) ? 1 : 0;
}
else
if (newValue == null || newValue == DBNull.Value)
{
cellValue = owner.NullImageIndex;
}
// Let the user map the value to an index
MapIndexEventArgs mapArgs = new MapIndexEventArgs(e.ColumnIndex, e.RowIndex, newValue, cellValue);
owner.OnMapValueToIndex(mapArgs);
cellValue = mapArgs.Index + 1;
// Cycle back to zero?
if (cellValue < 0 || cellValue >= owner.ImageList.Images.Count)
{
cellValue = 0;
}
// If set to the null image index, set it to null. Otherwise, use the value.
if (cellValue != owner.NullImageIndex)
{
// Let the user map the index back to a value
mapArgs.Index = cellValue;
mapArgs.Value = cellValue;
owner.OnMapIndexToValue(mapArgs);
// If the value changed, use that. If the value didn't change, use the new index value but
// convert it to the matching type.
if (mapArgs.Value == null || !mapArgs.Value.Equals(cellValue))
{
base.NewValue = mapArgs.Value;
}
else
if (newValue is int)
{
base.NewValue = cellValue;
}
else
if (newValue is short)
{
base.NewValue = (short)cellValue;
}
else
if (newValue is bool)
{
if (cellValue == 1)
{
base.NewValue = true;
}
else
{
base.NewValue = false;
}
}
else
{
base.NewValue = mapArgs.Value;
}
}
else
{
base.NewValue = null;
}
base.DataGridView.NotifyCurrentCellDirty(true);
base.DataGridView.InvalidateCell(this);
}
}