wrong use of ActivityDesigner makes app really slow
I have written the designer shown below for my custom activity.
When I assign this designer as an IRootDesigner to an activity, then everything is fine.
However, if I assign this designer as an IDesigner to an activity, then my complete application becomes really slow. Menus open very slow and screen gets not refreshed as it should.
Is there something wrong with the code shown below, with respect to usage as an IDesigner?
publicclassPanedActivityDesigner : System.Workflow.ComponentModel.Design.ActivityDesigner
{
privatebool isOnPath;
///<summary>
/// Is this activity on the path to a selected component
/// while simulation is running? This status is set from
/// within the WorkflowActivityDesigner.
///</summary>
publicbool IsOnPath
{
get {return isOnPath; }
set
{
isOnPath =value;
}
}
privatebool showStatus;
///<summary>
/// Returns true, if the NOT operator has been applied to
/// this designer
///</summary>
publicbool ShowStatus
{
get {return showStatus; }
set { showStatus =value; }
}
privatePaneCollection panes;
///<summary>
/// Default constructor.
///</summary>
public PanedActivityDesigner()
{
// initialize the PaneCollection
panes =newPaneCollection();
AddPanes();
}
#region Properties
///<summary>
/// A list of visual panes, that display the activities state.
///</summary>
publicPaneCollection Panes
{
get {return panes; }
set { panes =value; }
}
///<summary>
/// Adjust the size of the designer according to the inner objects.
///</summary>
publicoverrideSize Size
{
get
{
Size size =base.Size;
if (this.ParentDesigner !=null && Panes !=null)
{
Panes.Width = 100;
Panes.Height = 60;
Panes.Location =newPoint(this.Location.X + 2,
this.ShowStatus ?this.Location.Y + 2 +Images.Negation.Height :
this.Location.Y + 2);
size.Width = Panes.Width + 4;
size.Height = Panes.Height + 4;
if (this.ShowStatus)
{
size.Height +=Images.Negation.Height;
}
}
return size;
}
}
#endregion
///<summary>
/// Adds two Pane objects to a PaneCollection.
///</summary>
///<param name="panes"></param>
void AddPanes()
{
// add two panes
panes.Clear();
Pane pane1 =newPane();
pane1.BackColor =Color.FromArgb(224, 223, 227);
pane1.Font =newFont("Tahoma", 8);
pane1.ForeColor =Color.Black;
panes.Add(pane1);
Pane pane2 =newPane();
pane2.BackColor =Color.White;
pane2.Font =newFont("Tahoma", 8,FontStyle.Italic);
pane2.ForeColor =Color.Black;
panes.Add(pane2);
}
#region Event Handlers
///<summary>
/// Controls the appearance of a filter predicate in the workflow.
///</summary>
///<param name="e"></param>
protectedoverridevoid OnPaint(ActivityDesignerPaintEventArgs e)
{
if (this.ParentDesigner !=null && panes !=null)
{
// Console.WriteLine("OnPaint");
// Console.WriteLine(this.Bounds.ToString());
// add an additional pane, if this designer IsOnPath
if (isOnPath && panes.Count == 2)
{
Pane filterResultPane =newPane();
filterResultPane.BackColor =Color.FromArgb(122, 121, 153);
filterResultPane.Font =newFont("Tahoma", 8,FontStyle.Bold);
filterResultPane.ForeColor =Color.White;
Random rnd =newRandom();
filterResultPane.Text = rnd.Next(1, 85000).ToString();
panes.Add(filterResultPane);
}
if (!isOnPath && panes.Count == 3)
{
panes.RemoveAt(2);
}
// output the predicate expression string
PanedActivity activity =this.ActivityasPanedActivity;
if (activity !=null && activity.Predicates.Count > 0 &&
this.panes.Count == 2)
{
panes[0].Text = activity.Title;
if (activity.Predicates.Count > 1)
panes[1].Text = activity.Predicates.Count.ToString() +" Eintr?ge.";
else
panes[1].Text = activity.Predicates[0];
}
else
{
panes[0].Text ="Filter";
panes[1].Text ="Kriterium";
}
// draw the panes
panes.Invalidate(e.Graphics);
// draw the negation operator
int x =this.Location.X + (this.Bounds.Width / 2) -
Images.Negation.Width / 2;
if (this.ShowStatus)
{
Helpers.DrawImageUnscaled(e.Graphics,Images.Negation,
x,this.Location.Y + 1);
}
}
}
///<summary>
/// Opens the activity editor dialog.
///</summary>
///<param name="e">MouseEventArgs</param>
protectedoverridevoid OnMouseDoubleClick(MouseEventArgs e)
{
PanedActivity activity =this.ActivityasPanedActivity;
ActivityEditorDialog dialog =newActivityEditorDialog();
dialog.Title.Text =this.Panes[0].Text;
// preselect the correct entry in the ListBox
for (int i = 0; i <= dialog.Filters.Items.Count - 1; i++)
{
string s = dialog.Filters.Items
.ToString();
if (s ==this.panes[1].Text)
dialog.Filters.SetSelected(i,true);
}
dialog.ShowDialog();
if (dialog.DialogResult ==DialogResult.OK)
{
// update activity properties
if (activity !=null)
activity.Title = dialog.Title.Text;
activity.Predicates.Clear();
foreach (object oin dialog.Filters.SelectedItems)
{
activity.Predicates.Add(activity.Title +"=" + (string)o);
}
// update visual appearance
this.Panes[0].Text = activity.Title;
if (dialog.Filters.SelectedItems.Count == 1)
{
this.panes[1].Text = dialog.Filters.SelectedItems[0].ToString();
}
if (dialog.Filters.SelectedItems.Count > 1)
{
this.panes[1].Text = dialog.Filters.SelectedItems.Count.ToString() +
" Eintr?ge";
}
}
dialog.Dispose();
this.Invalidate();
}
///<summary>
/// Defines the tooltip shown, when entering the activity with the mouse.
///</summary>
///<param name="e"></param>
protectedoverridevoid OnMouseEnter(MouseEventArgs e)
{
string title =Messages.FilterActivityTitle;
string text =Messages.FilterActivityDescription;
this.ShowInfoTip(title, text);
}
///<summary>
/// Avoid other tooltips to be shown.
///</summary>
///<param name="e"></param>
protectedoverridevoid OnMouseMove(MouseEventArgs e)
{
// do nothing here to avoid the default tooltip to appear
}
///<summary>
/// Avoid other tooltips to be shown.
///</summary>
///<param name="e"></param>
protectedoverridevoid OnMouseHover(MouseEventArgs e)
{
// do nothing here to avoid the default tooltip to appear
}
#endregion
}
