internal void RequestSubformShowing(DataGridViewSubformCell sender, SubformShowingEventArgs e)
{
if (SubformShowing != null)
{
SubformShowing(sender, e);
}
}
/// <summary>
/// Shows the from with correct alignment
/// </summary>
public void ShowForm()
{
if (this.OwningColumn == null)
{
return;
}
if (((DataGridViewSubformColumn)this.OwningColumn).Subform == null)
{
return;
}
//save the previous alignment of cells for when the subform is closed and set new alignments to be the top
alignmentBeforeShow = new object[OwningRow.Cells.Count, 2];
for (int i = 0; i < OwningRow.Cells.Count; i++)
{
alignmentBeforeShow[i, 0] = OwningRow.Cells[i].Style.Alignment;
alignmentBeforeShow[i, 1] = OwningRow.Cells[i].OwningColumn;
if (OwningRow.Cells[i].Style.Alignment == DataGridViewContentAlignment.BottomCenter ||
OwningRow.Cells[i].Style.Alignment == DataGridViewContentAlignment.MiddleCenter)
{
OwningRow.Cells[i].Style.Alignment = DataGridViewContentAlignment.TopCenter;
}
else if (OwningRow.Cells[i].Style.Alignment == DataGridViewContentAlignment.BottomLeft ||
OwningRow.Cells[i].Style.Alignment == DataGridViewContentAlignment.MiddleLeft)
{
OwningRow.Cells[i].Style.Alignment = DataGridViewContentAlignment.TopLeft;
}
else if (OwningRow.Cells[i].Style.Alignment == DataGridViewContentAlignment.BottomRight ||
OwningRow.Cells[i].Style.Alignment == DataGridViewContentAlignment.MiddleRight)
{
OwningRow.Cells[i].Style.Alignment = DataGridViewContentAlignment.TopRight;
}
else if (OwningRow.Cells[i].Style.Alignment == DataGridViewContentAlignment.NotSet)
{
if (OwningRow.Cells[i].GetType() == typeof(DataGridViewCheckBoxCell))
{
OwningRow.Cells[i].Style.Alignment = DataGridViewContentAlignment.TopCenter;
}
else
{
OwningRow.Cells[i].Style.Alignment = DataGridViewContentAlignment.TopLeft;
}
}
}
heightBeforeShowSubForm = RowSubformCells.Max(r => r.heightBeforeShowSubForm);
if (heightBeforeShowSubForm == 0)
{
heightBeforeShowSubForm = OwningRow.Height; //save the original heigh of the row
}
//Fire the subformshowing event to get a possible alternate subform or cancel the showing
SubformShowingEventArgs ea = new SubformShowingEventArgs();
((DataGridViewSubformColumn)this.OwningColumn).RequestSubformShowing(this, ea);
Type t = null;
if (ea.Cancel)
{
_subformshowing = false;
return;
}
if (ea.AlternateForm != null)
{
t = ea.AlternateForm;
}
else
{
t = ((DataGridViewSubformColumn)this.OwningColumn).Subform;
}
//set the data for the subform
object data = null;
if (ea.DataBoundItem != null)
{
data = ea.DataBoundItem;
}
else
{
if (((DataGridViewSubformColumn)this.OwningColumn).SubformDataMember == "this")
{
data = OwningRow.DataBoundItem;
}
else
{
try
{
//follow members of member e.g. Shift.Employee.DateOfBirth
string[] parts = ((DataGridViewSubformColumn)this.OwningColumn).SubformDataMember.Split('.');
data = OwningRow.DataBoundItem;
foreach (string member in parts)
{
System.Reflection.PropertyInfo pi = data.GetType().GetProperty(member);
data = pi.GetValue(OwningRow.DataBoundItem, null);
}
}
catch (Exception e)
{
if (!((DataGridViewSubformColumn)this.OwningColumn).IgnoreSubformDataBindingError)
{
throw (e);
}
}
}
}
//create the subform
form = (DataGridViewSubForm)Activator.CreateInstance(t, data, this);
PositionSubform();
//set the new row height to be the same as the subform plus the original height
if (((DataGridViewExtension)DataGridView).SubFormColumns.Count() > 1)
{
this.OwningRow.Height = heightBeforeShowSubForm +
RowSubformCells.Max(r => r.SubformHeight);
}
else
{
this.OwningRow.Height = this.OwningRow.Height + form.Height;
}
//add the subform to the Data grid view
DataGridView.Controls.Add(form);
//reposition all open subforms
for (int i = OwningRow.Index + 1; i < DataGridView.Rows.Count; i++)
{
foreach (DataGridViewSubformColumn col in ((DataGridViewExtension)DataGridView).SubFormColumns)
{
DataGridViewSubformCell cell = (DataGridViewSubformCell)DataGridView.Rows[i].Cells[col.Index];
if (cell.SubformShowing)
{
cell.PositionSubform();
}
}
}
//set the z index for the new subform to be top most
int childIndex = Int32.MaxValue;
foreach (DataGridViewSubformColumn col in ((DataGridViewExtension)DataGridView).SubFormColumns)
{
int index = DataGridView.Controls.IndexOf(((DataGridViewSubformCell)OwningRow.Cells[col.Index]).form);
if (index < childIndex)
{
childIndex = index;
}
}
if (childIndex < DataGridView.Controls.IndexOf(form))
{
DataGridView.Controls.SetChildIndex(form, childIndex);
}
}