TCustomGrid.DoOPMoveColRow procedure
Performs a move operation for the column or row at the specified position.
Declaration
procedure DoOPMoveColRow(IsColumn: Boolean; FromIndex: Integer;
ToIndex: Integer)Arguments
IsColumn | True if index values are for columns instead of rows. |
FromIndex | Ordinal position for a column or a row moved in the method. |
ToIndex | Ordinal position where the column or row is relocated in the method. |
Description
DoOPMoveColRow is called from the MouseUp method when the mouse
button is released during a column or row drag operation.
DoOPMoveColRow ensures that FromIndex and ToIndex
contain valid index values for the grid. When FromIndex and ToIndex contain
the same value, the drag operation has ended without changing the position for
the column or row. In this situation, the grid control is redrawn and no
additional actions are performed in the method.
IsColumn determines whether column or row data is affected in the
method. When set to
True, the index values refer to column positions
on the grid. Otherwise, the index values refer to row positions.
Column Movement
Column movements are handled using either the Columns collection or the internal list of column widths maintained in the grid control. When Columns has been enabled, and column order is not locked using GridFlags, the MoveColumn method in the collection is used to move the specified column to its new position.
If Columns have not been defined, the internal column list is used to perform the operation. ColRowMoved is called to perform an event notification (implemented in descendent classes) when the action has been completed.
Row Movement
Row movements are handled using the internal list of row heights in the control. The Move method in in the list is called to relocate the specified row to its new position. ColRowMoved is called to perform an event notification (implemented in descendent classes) when the action has been completed.
DoOPMoveColRow calls AdjustEditorBounds to re-select the active cell and position an active cell editor (when needed). For a column movement, the value in SortColumn is updated to reflect the new position for the sort column.
See also
An experiment, built from development snapshots. Not the official Free Pascal or Lazarus documentation.