How to Create a Project Schedule with “Click-and-Drag” in Excel

The following article shows how to mark out and interrogate a calendar with the mouse. Mark Out And Interrogate A Calendar With The Mouse

*In the real world, we’d open a form to read and write meaningful diary entries to a database. This exercise simply reveals the mechanics of right_clicking, and finds the details from the worksheet itself.

Before we begin, a few words of explanation about the spreadsheet, a working model of which can be found here.A Few Words Of Explanation About The Spreadsheet

The Process

Clicking on a cell within the grid will highlight that cell and change its value. Click-and-drag will highlight a range and change its values. If a cell is populated, it will be cleared, otherwise it will be populated, in this case by an “*”.

A right_click by contrast is a request for information from the selected cell.

There are essentially two events used, along with several modules.

  • Worksheet_SelectionChange which is called when a cell or cells are selected.
  • Worksheet_BeforeRightClick which is called by the right-hand mouse button.

The Problem

Right_clicking a cell also constitutes a selection, triggering SelectionChange. We will have to let that event run its course, clearing the cell selected before it surrenders control to the BeforeRightClick event, when we’ll repopulate the cleared cell.  But this action will trigger the SelectionChanged event again, which has to be stopped from clearing it once again.

This we’ll do with a boolean flag called blnLoading.

The Events

Enter the following in the code window behind the worksheet (i.e. not in a module).

Option Explicit

    Dim blnLoading As Boolean
    Dim sPhase As String
    Dim currCellValue As String
    Dim dDate As Date

    Private Sub Worksheet_SelectionChange(ByVal Target As Range)
     If ActiveCell.Row > 14 And ActiveCell.Row < 25 Then
         If ActiveCell.Column > 4 And ActiveCell.Column < 47 Then 'selection is valid
 
             On Error Resume Next
             currCellValue = Target.Value 'get the target value from (ByVal Target As Range)
 
             If blnLoading = True Then 'a value of True will force an exit from this event
                 blnLoading = False
                 Exit Sub
             End If
 
             sPhase = Cells(ActiveCell.Row, 1)
             If sPhase = "" Then Exit Sub
 
             If ActiveCell = "*" Then 'if the cell is populated, clear the selected range
                 Call ClearRange
                 Call UnblockCalendar
             Else
                 Call PopulateRange
             End If
 
             Call RedrawCells
             Range("A1").Select 'revive the SelectionChange event by changing selection.
             Exit Sub
         End If
     End If
End Sub

Private Sub Worksheet_BeforeRightClick(ByVal Target As Range, Cancel As Boolean)
     If currCellValue = "*" Then   'picked up by the previous event BEFORE it cleared it;
                                     'This means this is a valid diary entry with detail.
        blnLoading = True    'this will prevent the SelectionChange event (above) from running.
        Target.Select
        'currCell = Target.Address
        'Range(currCell).Select

            Target.Value = "*" 're-instate the value of the cell, since SelectionChange has cleared it
            Call PopulateRange
            dDate = Cells(13, ActiveCell.Column)
            sPhase = Cells(ActiveCell.Row, 1)
            MsgBox dDate & " - " & sPhase
        Cancel = True 'suppress Excel’s standard right_click menus
    End If
    Range("A1").Select
        blnLoading = False
End Sub

This takes care of the two Events.

Referenced Code

Append the following, populating and depopulating ranges, to the code:

Sub ClearRange()
     Selection.FormulaR1C1 = ""
     With Selection.Interior
         .Pattern = xlNone
         .TintAndShade = 0
         .PatternTintAndShade = 0
     End With
End Sub

Sub PopulateRange()
     Selection.FormulaR1C1 = "*"
     With Selection.Interior
         .Pattern = xlSolid
         .PatternColorIndex = xlAutomatic
         .ThemeColor = xlThemeColorLight2
         .TintAndShade = 0.799981688894314
         .PatternTintAndShade = 0
     End With
End Sub

Maintenance of Gridlines

Insert a module into the application. Add the following code for maintaining the look of the grid. This was copied from the macro recorder, redundancies and all.

Option Explicit

Sub UnblockCalendar()
     Selection.FormulaR1C1 = ""
     With Selection
         Selection.Borders(xlDiagonalDown).LineStyle = xlNone
         Selection.Borders(xlDiagonalUp).LineStyle = xlNone
         Selection.Borders(xlEdgeLeft).LineStyle = xlNone
         Selection.Borders(xlEdgeTop).LineStyle = xlNone
         Selection.Borders(xlEdgeBottom).LineStyle = xlNone
         Selection.Borders(xlEdgeRight).LineStyle = xlNone
         Selection.Borders(xlInsideVertical).LineStyle = xlNone
         Selection.Borders(xlInsideHorizontal).LineStyle = xlNone
     End With
End Sub

Sub RedrawCells()
     Selection.Borders(xlDiagonalDown).LineStyle = xlNone
     Selection.Borders(xlDiagonalUp).LineStyle = xlNone
     With Selection.Borders(xlEdgeLeft)
         .LineStyle = xlContinuous
         .ColorIndex = 0
         .TintAndShade = 0
         .Weight = xlThin
     End With
     With Selection.Borders(xlEdgeTop)
         .LineStyle = xlContinuous
         .ColorIndex = 0
         .TintAndShade = 0
         .Weight = xlThin
     End With
     With Selection.Borders(xlEdgeBottom)
         .LineStyle = xlContinuous
         .ColorIndex = 0
         .TintAndShade = 0
         .Weight = xlThin
     End With
     With Selection.Borders(xlEdgeRight)
         .LineStyle = xlContinuous
         .ColorIndex = 0
         .TintAndShade = 0
         .Weight = xlThin
     End With
     With Selection.Borders(xlInsideVertical)
         .LineStyle = xlContinuous
         .ColorIndex = 0
         .TintAndShade = 0
         .Weight = xlThin
     End With
     With Selection.Borders(xlInsideHorizontal)
         .LineStyle = xlContinuous
         .ColorIndex = 0
         .TintAndShade = 0
         .Weight = xlThin
     End With
End Sub

Safeguarding against catastrophe

Anyone who does a lot of Excel development will know that complex xlsm spreadsheets can crash from time to time, corrupting the opened document. In more cases than might be expected, the damaged workbook can’t be recovered by Excel’s recovery routines. If there are no backups, the work done is lost. This can be prevented with tools designed to perform Excel fix.

Author Introduction:

Felix Hooker is a data recovery expert in DataNumen, Inc., which is the world leader in data recovery technologies, including rar repair and sql recovery software products. For more information visit www.datanumen.com

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