/// <summary>
/// Gets and sets the root control for point translation and message dispatch.
/// </summary>
/// <param name="parent">Parent control.</param>
public void UpdateParent(Control parent)
{
// Keep looking till we run out of parents
while (parent != null)
{
// We can hook into a visual control derived class
if (parent is VisualControl)
{
_rootControl = (VisualControl)parent;
_rootPopup = null;
break;
}
// We can hook into a visual popup derived class
if (parent is VisualPopup)
{
_rootControl = null;
_rootPopup = (VisualPopup)parent;
break;
}
// Move up another level
parent = parent.Parent;
}
}
/// <summary>
/// Finish tracking the current popup.
/// </summary>
public void EndCurrentTracking()
{
// Are we tracking a popup?
if (_current != null)
{
// Kill the popup window
if (!_current.IsDisposed)
{
_current.Dispose();
}
// Is there anything stacked?
if (_stack.Count > 0)
{
// Pop back and now track
_current = _stack.Pop();
}
else
{
// No longer tracking any popup
_current = null;
// Last popup removed, so unhook from message processing
FilterMessages(false);
}
}
}
/// <summary>
/// Finish tracking from the current back to and including the provided popup.
/// </summary>
/// <param name="popup">Popup that needs to be killed.</param>
public void EndPopupTracking(VisualPopup popup)
{
// Are we tracking a popup?
if (_current != null)
{
bool found = false;
do
{
// Is this the target?
found = (_current == popup);
// If possible then kill the current popup
if (!_current.IsDisposed)
{
_current.Dispose();
}
_current = null;
// If anything on stack, then it becomes the current one
if (_stack.Count > 0)
{
_current = _stack.Pop();
}
}while (!found && (_current != null));
// If we removed all the popups
if (_current == null)
{
// No longer need to filter
FilterMessages(false);
}
}
}
/// <summary>
/// Finish tracking all popups.
/// </summary>
public void EndAllTracking()
{
// Are we tracking a popup?
if (_current != null)
{
// Kill the popup window
if (!_current.IsDisposed)
{
_current.Dispose();
_current = null;
}
// Is there anything stacked?
while (_stack.Count > 0)
{
// Pop back the popup
_current = _stack.Pop();
// Kill the popup
_current.Dispose();
_current = null;
}
// No longer need to filter
FilterMessages(false);
}
}
/// <summary>
/// Start tracking the provided popup.
/// </summary>
/// <param name="popup">Popup instance to track.</param>
public void StartTracking(VisualPopup popup)
{
Debug.Assert(popup != null);
Debug.Assert(!popup.IsDisposed);
Debug.Assert(popup.IsHandleCreated);
Debug.Assert(_suspended == 0);
// The popup control must be valid
if ((popup != null) && !popup.IsDisposed && popup.IsHandleCreated)
{
// Cannot start tracking when a popup menu is alive
if (_suspended == 0)
{
// If we already have a popup...
if (_current != null)
{
// Then stack it
_stack.Push(_current);
}
else
{
// Cache the currently active window
_activeWindow = PI.GetActiveWindow();
// For the first popup, we hook into message processing
FilterMessages(true);
}
// Store reference
_current = popup;
}
}
}
private bool ProcessNonClientMouseDown(ref Message m)
{
// Extract the x and y mouse position from message
Point screenPt = new Point(PI.LOWORD((int)m.LParam), PI.HIWORD((int)m.LParam));
// Ask the popup if this message causes the entire stack to be killed
if (_current.DoesCurrentMouseDownEndAllTracking(m, ScreenPtToClientPt(screenPt)))
{
EndAllTracking();
}
// Do any of the current popups want the mouse down to be eaten?
bool processed = false;
if (_current != null)
{
processed = _current.DoesMouseDownGetEaten(m, screenPt);
if (!processed)
{
// Search from end towards the front, the last entry is the most recent 'Push'
VisualPopup[] popups = _stack.ToArray();
for (int i = 0; i < popups.Length; i++)
{
// Ignore disposed popups
VisualPopup popup = popups[i];
if (!popup.IsDisposed)
{
processed = popup.DoesMouseDownGetEaten(m, screenPt);
if (processed)
{
break;
}
}
}
}
}
return(processed);
}
private bool ProcessClientMouseDown(ref Message m)
{
bool processed = false;
// Convert the client position to screen point
Point screenPt = CommonHelper.ClientMouseMessageToScreenPt(m);
// Is this message for the current popup?
if (m.HWnd == _current.Handle)
{
// Message is intended for the current popup which means we ask the popup if it
// would like to kill the entire stack because it knows the mouse down should
// cancel the showing of popups.
if (_current.DoesCurrentMouseDownEndAllTracking(m, ScreenPtToClientPt(screenPt)))
{
EndAllTracking();
}
}
else
{
// If the current popup is not the intended recipient but the current popup knows
// that the mouse down is safe because it is within the client area of itself, then
// just let the message carry on as normal.
if (_current.DoesCurrentMouseDownContinueTracking(m, ScreenPtToClientPt(screenPt)))
{
return(processed);
}
else
{
// Mouse is not inside the client area of the current popup, so we are going to end all tracking
// unless we can find a popup that wants to become the current popup because the mouse happens to
// be other it, and it wants it.
VisualPopup[] popups = _stack.ToArray();
// Search from end towards the front, the last entry is the most recent 'Push'
for (int i = 0; i < popups.Length; i++)
{
// Ignore disposed popups
VisualPopup popup = popups[i];
if (!popup.IsDisposed)
{
// If the mouse down is inside the popup instance
if (popup.RectangleToScreen(popup.ClientRectangle).Contains(screenPt))
{
// Does this stacked popup want to become the current one?
if (popup.DoesStackedClientMouseDownBecomeCurrent(m, ScreenPtToClientPt(screenPt, popup.Handle)))
{
// Kill the popups until back at the requested popup
while ((_current != null) && (_current != popup))
{
_current.Dispose();
if (_stack.Count > 0)
{
_current = _stack.Pop();
}
}
}
return(processed);
}
}
}
// Do any of the current popups want the mouse down to be eaten?
if (_current != null)
{
processed = _current.DoesMouseDownGetEaten(m, screenPt);
if (!processed)
{
// Search from end towards the front, the last entry is the most recent 'Push'
for (int i = 0; i < popups.Length; i++)
{
// Ignore disposed popups
VisualPopup popup = popups[i];
if (!popup.IsDisposed)
{
processed = popup.DoesMouseDownGetEaten(m, screenPt);
if (processed)
{
break;
}
}
}
}
}
// Mouse down not intercepted by any popup, so end tracking
EndAllTracking();
}
}
return(processed);
}
/// <summary>
/// Gets and sets the root control for point translation and message dispatch.
/// </summary>
/// <param name="parent">Parent control.</param>
public void UpdateParent(Control parent)
{
// Keep looking till we run out of parents
while (parent != null)
{
// We can hook into a visual control derived class
if (parent is VisualControl)
{
_rootControl = (VisualControl)parent;
_rootPopup = null;
break;
}
// We can hook into a visual popup derived class
if (parent is VisualPopup)
{
_rootControl = null;
_rootPopup = (VisualPopup)parent;
break;
}
// Move up another level
parent = parent.Parent;
}
}