IsReservedLocation Method (IEditor)

Determines whether the specified cursor location has special meaning to the editor control.

Syntax

Visual Basic
C#

'Declaration
 
Function IsReservedLocation( _
   ByVal g As Graphics, _
   ByVal x As Integer, _
   ByVal y As Integer, _
   ByVal rc As Rectangle, _
   ByVal appearance As Appearance, _
   ByVal value As Object, _
   ByVal zoomFactor As Single _
) As Object

'Usage
 
Dim instance As IEditor
Dim g As Graphics
Dim x As Integer
Dim y As Integer
Dim rc As Rectangle
Dim appearance As Appearance
Dim value As Object
Dim zoomFactor As Single
Dim value As Object
 
value = instance.IsReservedLocation(g, x, y, rc, appearance, value, zoomFactor)

object IsReservedLocation( 
   Graphics g,
   int x,
   int y,
   Rectangle rc,
   Appearance appearance,
   object value,
   float zoomFactor
)

Parameters

g: Graphics device interface for painting the editor control
x: X-coordinate of pointer location
y: Y-coordinate of pointer location
rc: Location and size of a rectangular region
appearance: Appearance settings of the editor control
value: Object that contains the name of the editor control
zoomFactor: Numeric value for scaling the display of the editor control

Return Value

Non-null if the location is a reserved cell area; null (Nothing in VisualBasic) if the location is in a normal cell area

Remarks

If this method returns null (Nothing in VisualBasic) then the location is in a normal cell area (that is, a single click selects a cell and double-click edits the cell). If this method returns non-null then the location is in a special cell area (that is, single click edits the cell). Examples of special cell areas include a drop-down button in a combo box cell, a knob in a slider cell, increment buttons, and the entire area in a button or check box cell. During MouseMove events, non-null values from IsReservedLocation get passed to GetReservedCursor to obtain the mouse pointer to display over the special area. This allows for the possibility of multiple special areas with each special area having its own cursor. The non-null object can be anything the cell type has. The Spread component only checks for null or nun-null. If the cell type has multiple special areas, then the cell type might return an integer or enumeration value to indicate which special area the mouse is over. If the cell type only has one special area, then the cell type could simply return itself as the non-null object.

class CheckBoxCellType : BaseCellType
{
...
public override object IsReservedLocation(...)
{
return this;
}
public override Cursor GetReservedCursor(object o)
{
if (o != null)
return Cursors.Arrow;
else
return null;
}
...
}

Note: The IsReservedLocation and GetReservedCursor methods work as a team with the one getting called after the other.

For limits on the zoomFactor parameter, refer to the ZoomFactor property for the sheet.

Example

This example subclasses the IEditor class and uses a CheckBox as the cell editor to illustrate the use of the methods and events.

public static CheckBox ck = new CheckBox();

class myEditor : FarPoint.Win.Spread.CellType.IEditor
{
     public event EventHandler EditingCanceled;
     public event EventHandler EditingStopped;
     public bool StopEditing()
     {
          if (EditingStopped != null)
          {
               EditingStopped(ck, EventArgs.Empty);
               base.FireEditingStopped();
               return true;
          }
          else
          {
               return false;
          }
     }

     public void CancelEditing()
     {
          EditingCanceled(ck, EventArgs.Empty);
          base.FireEditingCanceled();
     }
     
     public bool IsReservedKey(KeyEventArgs e)
     {
          return false;
     }
          
     public bool IsValid(Object value)
     {
          return true;
     }
     
     public Size GetPreferredSize(System.Windows.Forms.Control editor)
     {
          return editor.Size;
     }

     public Cursor GetReservedCursor(object o)
     {
          return null;
     }

     public Control GetEditorControl(FarPoint.Win.Spread.Appearance appr, float zoom)
     {
          return ck;
     }

     public object GetEditorValue()
     {
          return ck.CheckState;
     }

     public void SetEditorValue(object value)
     {
     }

     public object IsReservedLocation(Graphics g, int x, int y, Rectangle r, FarPoint.Win.Spread.Appearance appr, object value,
float zoom)
     {
          return null;
     }

     public void StartEditing(EventArgs e, bool selectAll)
     {
          selectAll = true;
     }

     public void ShowSubEditor()
     {
     this.ShowSubEditor();
     }
}

private void Form1_Load(object sender, System.EventArgs e)
{
     fpSpread1.ActiveSheet.Cells[0, 0].Editor = new myEditor();
}

Visual Basic

Shared ck As New CheckBox()

Public Class myEditor
Implements FarPoint.Win.Spread.CellType.IEditor

     Public Event EditingStopped(ByVal sender As Object, ByVal e As EventArgs) Implements FarPoint.Win.Spread.CellType.IEditor.EditingStopped

     Public Event EditingCancelled(ByVal sender As Object, ByVal e As EventArgs) Implements FarPoint.Win.Spread.CellType.IEditor.EditingCanceled

     Public Function StopEditing() As Boolean Implements FarPoint.Win.Spread.CellType.IEditor.StopEditing
          RaiseEvent EditingStopped(ck, EventArgs.Empty)
          MyBase.FireEditingStopped()
          Return True
     End Function

     Public Sub CancelEditing() Implements FarPoint.Win.Spread.CellType.IEditor.CancelEditing
          RaiseEvent EditingCancelled(ck, EventArgs.Empty)
          MyBase.FireEditingCanceled()
     End Sub

     Public Function IsReservedKey(ByVal e As KeyEventArgs) As Boolean Implements FarPoint.Win.Spread.CellType.IEditor.IsReservedKey
          Return False
     End Function

     Public Function IsValid(ByVal value As Object) As Boolean Implements FarPoint.Win.Spread.CellType.IEditor.IsValid
          Return True
     End Function

     Public Function GetReservedCursor(ByVal o As Object) As Cursor Implements FarPoint.Win.Spread.CellType.IEditor.GetReservedCursor
          Return Nothing
     End Function

     Public Function GetEditorControl(ByVal appr As FarPoint.Win.Spread.Appearance, ByVal zoom As Single) As Control Implements
FarPoint.Win.Spread.CellType.IEditor.GetEditorControl
          Return ck
     End Function

     Public Function GetEditorValue() As Object Implements FarPoint.Win.Spread.CellType.IEditor.GetEditorValue
          Return ck.CheckState
     End Function

     Public Function GetPreferredSize(ByVal editor As System.Windows.Forms.Control) As Size Implements FarPoint.Win.Spread.CellType.IEditor.GetPreferredSize
          Return editor.Size
     End Function

     Public Sub SetEditorValue(ByVal value As Object) Implements FarPoint.Win.Spread.CellType.IEditor.SetEditorValue
          ck.CheckState = CheckState.Checked
     End Sub

     Public Function IsReservedLocation(ByVal g As Graphics, ByVal x As Integer, ByVal y As Integer, ByVal r As Rectangle,
ByVal appr As FarPoint.Win.Spread.Appearance, ByVal value As Object, ByVal zoom As Single) As Object Implements FarPoint.Win.Spread.CellType.IEditor.IsReservedLocation
          Return Nothing
     End Function

     Public Sub StartEditing(ByVal e As EventArgs, ByVal selectAll As Boolean) Implements FarPoint.Win.Spread.CellType.IEditor.StartEditing
               selectAll = True
     End Sub

     Public Sub ShowSubEditor() Implements FarPoint.Win.Spread.CellType.IEditor.ShowSubEditor
               Me.ShowSubEditor()
     End Sub
End Class

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
     FpSpread1.ActiveSheet.Cells(0, 0).Editor = New myEditor()
End Sub

Reference

IEditor Interface
IEditor Members
GetReservedCursor Method