/// <summary>
/// Handles MdiChildActivate event handler.
/// </summary>
/// <remarks>
/// Validates whether current MDI may lose the focus. If validation failes,
/// reactivates invalid MDI that is losing the focus.
/// </remarks>
///
private void ValidateMdiChildActivate()
{
Debug.TraceLine("MdiChildActivate: {0}",
ActiveMdiChild == null ? "none" : ActiveMdiChild.Name);
MyMdiForm myMdiForm = this.lastMdiChild as MyMdiForm;
if (this.lastMdiChild != ActiveMdiChild && myMdiForm != null)
{
FormBase mdiForm = myMdiForm.Tag as FormBase;
if (mdiForm != null && mdiForm.IsDirty())
{
// System.Media.SystemSounds.Beep.Play ();
mdiForm.MdiForm.Activate();
Debug.TraceLine("MdiChildActivate: Reactivated as dirty: {0}",
ActiveMdiChild == null ? "none" : ActiveMdiChild.Name);
}
}
this.lastMdiChild = ActiveMdiChild;
this.InfoMessage = ActiveMdiChild == null ? "Ready." : ActiveMdiChild.Text;
}
/////////////////////////////////////////////////////////////////////////////////
#region [ Overriden Base Methods ]
/// <summary>
/// Intercepts Windows messages.
/// </summary>
/// <remarks>
/// Prevents combobox to respond to left mouse button keys and wheel
/// in read-only mode. Mouse wheel events are forwarded to MyMdiForm parent.
/// </remarks>
///
protected override void WndProc(ref Message m)
{
if (ReadOnly) // Ignore left mouse button and forward mouse wheel to parent
{
switch (m.Msg)
{
case 0x0201: // WM_LBUTTONDOWN
case 0x0202: // WM_LBUTTONUP
case 0x0203: // WM_LBUTTONDBLCLK
return;
case 0x020A: // WM_MOUSEWHEEL
MyMdiForm parent = Parent as MyMdiForm;
if (parent != null)
{
int delta = ((int)m.WParam) >> 16; // high-order word
int xpos = ((int)m.LParam) & 0xFFFF; // low-order word
int ypos = ((int)m.LParam) >> 16; // high-order word
MouseEventArgs e = new MouseEventArgs(0, 0, xpos, ypos, delta);
parent.ProcessMouseWheel(e);
}
return;
}
}
else // Ignore mouse wheel when not read-only
{
switch (m.Msg)
{
case 0x020A: // WM_MOUSEWHEEL
return;
}
}
base.WndProc(ref m);
}
/////////////////////////////////////////////////////////////////////////////////////
#region [ Protected Constructor ]
/// <summary>
/// Initializes a new instance of the FormBase with specified caption and dimensions.
/// </summary>
/// <remarks>
/// Note that protected constructor forbidds instantiation of the FormBase objects
/// outside the dervied classes from FormBase.
/// </remarks>
///
protected FormBase(string caption, int width, int height)
{
Caption = caption;
ReadOnly = true;
IgnoreRecordChanges = false;
/////////////////////////////////////////////////////////////////////////////////
MdiForm = new MyMdiForm(width, height)
{
Tag = this, ReadOnly = true
};
TraceID = MdiForm.Name + "-[" + Caption + "]";
InitializeMdiForm();
}
/////////////////////////////////////////////////////////////////////////////////////
/// <summary>
/// Forces validation of the window and executes delegate if
/// validation was successfull.
/// </summary>
/// <param name="method">Delegate to be executed if validation was ok.</param>
/// <returns>True if validation was successfull.</returns>
///
public static bool IfValidateOk(this MdiClient control, Action method = null)
{
Form parent = control.Parent as Form;
if (parent != null)
{
MyMdiForm mdiForm = parent.ActiveMdiChild as MyMdiForm;
if (mdiForm != null)
{
return(mdiForm.IfValidateOk(method));
}
}
if (method != null)
{
method();
}
return(true);
}