private void DropDownToggle()
{
if (DroppedDown) //DroppedDown, so we need to collapse.
{
butDrop.ImageIndex = 0; //Set to arrow down image.
_popup.Close(); //This collapses the popup. The popup is NOT disposed.
FillText();
if (SelectionChangeCommitted != null)
{
SelectionChangeCommitted(this, new EventArgs());
}
}
else //Not DroppedDown, so we need to DropDown.
{
butDrop.ImageIndex = 1; //Set to arrow up image.
#region Popup setup
_popup = new PopupWindow(gridMain);
_popup.AutoClose = false; //This prevents the Alt key from collapsing the combobox and prevents other events from collapsing as well.
_popup.Closed += PopupWindow_Closed;
_popup.Opened += PopupWindow_Opened;
Control parent = Parent;
int x = this.Location.X;
int y = this.Location.Y;
while (parent != null && !typeof(Form).IsAssignableFrom(parent.GetType()))
{
x += parent.Location.X;
y += parent.Location.Y;
parent = parent.Parent;
}
#endregion Popup setup
_popup.Show(ParentForm, new Point(x, y + this.Height));
}
//The keyboard listener lifetime begins on first dropdown and ends when the control is disposed or parent form is closed.
if (_threadCheckKeyboard == null)
{
//When DroppedDown, will update input flags for auto collapsing.
_threadCheckKeyboard = new ODThread(100, WorkerThread_KeyboardListener);
_threadCheckKeyboard.Start();
}
}
private void DropDownToggle()
{
if (DroppedDown) //DroppedDown, so we need to collapse.
{
if (_doUsePopup)
{
_popup.Close(); //This collapses the popup. The popup is NOT disposed.
}
else
{
gridMain.Visible = false;
}
FillText();
if (SelectionChangeCommitted != null)
{
SelectionChangeCommitted(this, new EventArgs());
}
}
else //Not DroppedDown, so we need to DropDown.
{
#region Popup setup
//If the grid rows differ from the items count, refill the grid because something happened to the ArrayList that the control wasn't aware of.
//For example, If a ComboBoxMulti never sets an item selected, the grid is never filled, even though the ArrayList has items in it.
//Filling the grid when opening the dropdown matches the UI behavior found in regular combo boxes.
SynchronizeGrid();
Control parent = Parent;
int x = this.Location.X;
int y = this.Location.Y;
while (parent != null && !typeof(Form).IsAssignableFrom(parent.GetType()))
{
x += parent.Location.X;
y += parent.Location.Y;
parent = parent.Parent;
}
if (_doUsePopup)
{
_popup = new PopupWindow(gridMain);
_popup.AutoClose = false; //This prevents the Alt key from collapsing the combobox and prevents other events from collapsing as well.
_popup.Closed += PopupWindow_Closed;
_popup.Opened += PopupWindow_Opened;
#endregion Popup setup
_popup.Show(ParentForm, new Point(x, y + this.Height));
}
else
{
int gridTop = y + this.Height;
if (gridTop + gridMain.Height >= ParentForm.ClientSize.Height)
{
//The grid does not have enough room to fit on the form.
if (y > ParentForm.ClientSize.Height - gridTop)
{
//If there's more room, put the grid above the combobox.
gridTop = y - gridMain.Height;
if (gridTop < 0)
{
//Not enough room, shrink the grid height.
gridMain.Height = y;
gridTop = 0;
}
}
else
{
//If there's not enough room to show the grid below, shrink the grid height.
gridMain.Height = ParentForm.ClientSize.Height - gridTop;
}
}
gridMain.Location = new Point(x, gridTop);
gridMain.Anchor = this.Anchor;
ParentForm.Controls.Add(gridMain);
gridMain.Visible = true;
gridMain.BringToFront();
}
}
//The keyboard listener lifetime begins on first dropdown and ends when the control is disposed or parent form is closed.
if (_threadCheckKeyboard == null)
{
//When DroppedDown, will update input flags for auto collapsing.
_threadCheckKeyboard = new ODThread(100, WorkerThread_KeyboardListener);
_threadCheckKeyboard.AddExceptionHandler((ex) => ex.DoNothing());
_threadCheckKeyboard.Start();
}
}
