Handling GanttChart on ActivityDialog Using C# ILOG

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Introduction

I was recently involved in developing a schedule management system using the Gantt Model provided by the C# .NET Framework. I extended ActivityDialog and designed a new dialog that handles customer-specific activity, resource, constraint, and reservation. In this project, I was confronted with a difficulty: how to handle a GanttChart on ActivityDialog. I give you my solution for the problem in this article.

Background

I added a new TabPage (includes a DataGridView) on the ActivityDialog to be able to add/delete/update a new constraint of activity. This DataGridView has two columns (activity and lead time). The activity combobox column means the From-Activity of the constraint. The requirement is to display the selected activity on the GanttChart when you add a new constraint on the ActivityDialog.

Using the code

I needed new combobox to handle the GanttChart, so I defined the DataGridViewExtendedComboBoxColumn class for the activity combo box. In this class, I overrode InitializeEditingControl to add two event handlers: the SelectedIndexChanged handler displays the selected activity on the GanttChart.

public class ProgressActivityDialog : ILOG.Views.Gantt.Windows.Forms.ActivityDialog
{
    public ProgressActivityDialog(InitParamActivityDialog param)
    {
    }
    protected override void OnVisibleChanged(EventArgs e)
    {
        base.OnVisibleChanged(e);
        // When this Dialog opens
        if (this.Visible)
        {
            // Check Return Conditions
            if ((this.tabControl.TabPages == null) || 
                (this.tabControl.TabPages.Count == 0) || 
                (this.currentActivity == null))
            {
                return;
            }
            // Remove Default predecessorsTab on ActivityDialog
            this.tabControl.TabPages.Remove(predecessorsTab);
            // Kojun Activity Only Use resourcesTab on ActivityDialog
            if (currentActivity.BNodeLevel != (int)ActivityNodeLevel.Kojun)
            {
                // Remove Default resourcesTab on ActivityDialog
                this.tabControl.TabPages.Remove(resourcesTab);
            }
            // In case of Event Activity, Set some components of resourcesTab invisible
            if (currentActivity.BEventFlg == 1)
            {
                this.resourcesLabel.Visible = false;
                this.resourcesGrid.Visible = false;
                this.resourceNewGrid.Visible = false;
            }
            // In case of Schedule Organization, Set New Activity's StartTime and EndTime
            if (initParams.dialogType == EnumDialogType.ScheduleOrganization)
            {
                if ((initParams.isNewActivity) && 
                    (currentActivity.BNodeLevel == (int)ActivityNodeLevel.Kojun))
                {
                    if (currentActivity.BEventFlg == 0)
                    {
                        currentActivity.StartTime = DateTime.Now.Date + new TimeSpan(8, 0, 0);
                        currentActivity.EndTime = DateTime.Now.Date + new TimeSpan(17, 0, 0);
                        currentActivity.Duration = new TimeSpan(9, 0, 0);
                    }
                    else
                    {
                        currentActivity.StartTime = DateTime.Now.Date + new TimeSpan(8, 0, 0);
                        currentActivity.EndTime = currentActivity.StartTime;
                        currentActivity.Duration = new TimeSpan(0, 0, 0);
                    }
                    this.startDateTimePicker.Value = currentActivity.StartTime;
                    this.finishDateTimePicker.Value = currentActivity.EndTime;
                }
            }
            // EventHandler When TabPage of TabControl is changed
            tabControl.SelectedIndexChanged += 
                       new EventHandler(TabControl_SelectedIndexChanged);
            // EventHandler When KojunName ComboBox Selected Index is changed
            kojunNameCombo.SelectedIndexChanged += 
                       new EventHandler(KojunNameCombo_SelectedIndexChanged);
            // EventHandler When EventName ComboBox Selected Index is changed
            eventNameCombo.SelectedIndexChanged += 
                       new EventHandler(EventNameCombo_SelectedIndexChanged);
            // EventHandler When IgnoreCalendar Checkbox Checked is changed
            ignoreCalendarChkBox.CheckedChanged += 
                       new EventHandler(IgnoreCalendarChkBox_CheckedChanged);
            // Set notesTab.noteTextBox
            this.noteTextBox.Clear();
            if (currentActivity.BNodeLevel == (int)ActivityNodeLevel.Kojun)
            {
                this.noteTextBox.Text = currentActivity.BCmnt;
            }
        }
    }
    // Set Columns of PredecessorNewGrid DataGridView
    private void SetPredecessorNewGridColumns()
    {
        predecessorsNewGrid.Columns.Clear();
        // Set ExtendedComboBoxColumn for activity field
        DataGridViewExtendedComboBoxColumn activityCombo = 
                      new DataGridViewExtendedComboBoxColumn();
        activityCombo.relatedGanttChart = initParams.ganttChart;            
        activityCombo.DataPropertyName = "Activity";
        activityCombo.DisplayMember = "NODE_NM";
        activityCombo.ValueMember = "NODE_ID";
        SetItemsonConstraintFromActivityNameComboBoxColumn(
                       this.Activity.GanttModel.Activities, activityCombo);
        predecessorsNewGrid.Columns.Add(activityCombo);
        // Set TextBox for leadTime field
        DataGridViewTextBoxColumn leadTimeText = new DataGridViewTextBoxColumn();
        leadTimeText.DataPropertyName = "leadTime";
        predecessorsNewGrid.Columns.Add(leadTimeText);
    }
 
    //
    //
    //
    /// Internal Class: Define predecessorsNewGrid'S DataGridViewComboBoxCell
    internal class DataGridViewExtendedComboBoxCell : DataGridViewComboBoxCell
    {
        public override void InitializeEditingControl(int rowIndex, 
               object initialFormattedValue, DataGridViewCellStyle dataGridViewCellStyle)
        {
            if (base.DataGridView != null)
            {
                base.InitializeEditingControl(rowIndex, initialFormattedValue, 
                                              dataGridViewCellStyle);
                ComboBox comboBox = base.DataGridView.EditingControl as ComboBox;
                if (comboBox != null)
                {
                    comboBox.DropDownStyle = ComboBoxStyle.DropDownList;
                    // Add Event
                    comboBox.SelectedIndexChanged += 
                             new EventHandler(comboBox_SelectedIndexChanged);
                    comboBox.Leave += new EventHandler(comboBox_Leave);
                }
            }
        }
        private void comboBox_Leave(object sender, EventArgs e)
        {
            // Delete Event
            ComboBox comboBox = base.DataGridView.EditingControl as ComboBox;
            if (comboBox != null)
            {
                comboBox.SelectedIndexChanged -= 
                         new EventHandler(comboBox_SelectedIndexChanged);
            }
            comboBox.Leave -= new EventHandler(comboBox_Leave);
        }
        private void comboBox_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (base.DataGridView != null)
            {
                DataGridViewComboBoxEditingControl cbo = 
                            sender as DataGridViewComboBoxEditingControl;
                if ((cbo.Text.Trim() != string.Empty) && 
                    (cbo.FindStringExact(cbo.Text) != -1))
                {
                    // Move Selected Activity to Left-Up Position on GanttSheet
                    DataGridViewExtendedComboBoxColumn column = 
                       (this.DataGridView.Columns[0]) as DataGridViewExtendedComboBoxColumn;
                    if (column != null)
                    {
                        if (column.relatedGanttChart != null)
                        {
                            GanttChart ganttChart = column.relatedGanttChart;
                            ProgressActivity selectedActivity = 
                              (ProgressActivity)ganttChart.GanttModel.FindActivity(
                               (string)cbo.SelectedValue);
                            // Expand selectedActivity
                            ganttChart.GanttTable.ExpandAll();
                            // Move to Left-Up Position
                            SetFirstVisibleActivityOnGanttChart(ganttChart, selectedActivity);
                        }
                    }
                }
            }
        }
        private void SetFirstVisibleActivityOnGanttChart(GanttChart ganttChart, 
                     ProgressActivity activity)
        {
            // Set GanttChart's FristVisibleTime
            if (activity.StartTime != DateTime.Parse("0001/1/1"))
            {
                ganttChart.FirstVisibleTime = activity.StartTime;
            }
            // Set GanttChart's FirstVisibleRow
            ganttChart.FirstVisibleRow = ganttChart.GanttTable.IndexOfRow(activity);
        }
    }
    /// Internal Class: Define predecessorsNewGrid's DataGridViewComboBoxColumn
    internal class DataGridViewExtendedComboBoxColumn : DataGridViewComboBoxColumn
    {
        public GanttChart relatedGanttChart = null;
        public DataGridViewExtendedComboBoxColumn()
        {
            DataGridViewExtendedComboBoxCell comboBoxCell = 
                                 new DataGridViewExtendedComboBoxCell();
            // Set Cell Template
            this.CellTemplate = comboBoxCell;
        }
    }
}

Points of Interest

This sample shows a way to handle GanttChart by selecting a combo box element on an ActivityDialog.