public CenterWindow(IntPtr hOwner)
{
this.hOwner = hOwner;
this.cbtHook = new CbtHook();
cbtHook.WindowActivate += new CbtHook.CbtEventHandler(WndActivate);
cbtHook.Install();
}
public void Dispose()
{
if (wndProcRetHook != null)
{
wndProcRetHook.Uninstall();
wndProcRetHook = null;
}
if (cbtHook != null)
{
cbtHook.Uninstall();
cbtHook = null;
}
}
/// <summary>
/// Displays a message box in front of the specified object and with the specified text.
/// </summary>
/// <param name="owner">An implementation of IWin32Window that will own the modal dialog box.</param>
/// <param name="text">The text to display in the message box.</param>
/// <param name="caption">The text to display in the title bar of the message box.</param>
/// <param name="buttons">One of the MessageBoxButtons values that specifies which buttons to display in the message box.</param>
/// <param name="icon">One of the MessageBoxIcon values that specifies which icon to display in the message box.</param>
/// <param name="defaultButton">One of the MessageBoxDefaultButton values that specifies the default button for the message box.</param>
public static DialogResult ShowDialog(IWin32Window owner, string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defaultButton)
{
if (!MessageBox.IsRunningOnMono)
{
lock (_syncRoot) {
if (owner != null)
{
using (CbtHook ch = new CbtHook(owner)) {
return((DialogResult)NativeMethods.MessageBox(owner.Handle, text, caption, (uint)buttons | (uint)icon | (uint)defaultButton));
}
}
else
{
using (CbtHook ch = new CbtHook(null)) {
return((DialogResult)NativeMethods.MessageBox(System.IntPtr.Zero, text, caption, (uint)buttons | (uint)icon | (uint)defaultButton));
}
}
} //lock
}
else //MONO
{
return(System.Windows.Forms.MessageBox.Show(owner, text, caption, buttons, icon, defaultButton, 0));
}
}
public void WndActivate(object sender, CbtEventArgs e)
{
IntPtr hMsgBox = e.wParam;
// try to find a howner for this message box
if (hOwner == IntPtr.Zero)
{
hOwner = USER32.GetActiveWindow();
}
// get the MessageBox window rect
RECT rectDlg = new RECT();
USER32.GetWindowRect(hMsgBox, ref rectDlg);
// get the owner window rect
RECT rectForm = new RECT();
USER32.GetWindowRect(hOwner, ref rectForm);
// get the biggest screen area
Rectangle rectScreen = API.TrueScreenRect;
// if no parent window, center on the primary screen
if (rectForm.right == rectForm.left)
{
rectForm.right = rectForm.left = Screen.PrimaryScreen.WorkingArea.Width / 2;
}
if (rectForm.bottom == rectForm.top)
{
rectForm.bottom = rectForm.top = Screen.PrimaryScreen.WorkingArea.Height / 2;
}
// center on parent
int dx = ((rectDlg.left + rectDlg.right) - (rectForm.left + rectForm.right)) / 2;
int dy = ((rectDlg.top + rectDlg.bottom) - (rectForm.top + rectForm.bottom)) / 2;
rect = new Rectangle(
rectDlg.left - dx,
rectDlg.top - dy,
rectDlg.right - rectDlg.left,
rectDlg.bottom - rectDlg.top);
// place in the screen
if (rect.Right > rectScreen.Right)
{
rect.Offset(rectScreen.Right - rect.Right, 0);
}
if (rect.Bottom > rectScreen.Bottom)
{
rect.Offset(0, rectScreen.Bottom - rect.Bottom);
}
if (rect.Left < rectScreen.Left)
{
rect.Offset(rectScreen.Left - rect.Left, 0);
}
if (rect.Top < rectScreen.Top)
{
rect.Offset(0, rectScreen.Top - rect.Top);
}
if (e.IsDialog)
{
// do the job when the WM_INITDIALOG message returns
wndProcRetHook = new WndProcRetHook(hMsgBox);
wndProcRetHook.WndProcRet += new WndProcRetHook.WndProcEventHandler(WndProcRet);
wndProcRetHook.Install();
}
else
{
USER32.MoveWindow(hMsgBox, rect.Left, rect.Top, rect.Width, rect.Height, 1);
}
// uninstall this hook
WindowsHook wndHook = (WindowsHook)sender;
Debug.Assert(cbtHook == wndHook);
cbtHook.Uninstall();
cbtHook = null;
}
/// <summary>
/// Displays a message box in front of the specified object and with the specified text.
/// </summary>
/// <param name="owner">An implementation of IWin32Window that will own the modal dialog box.</param>
/// <param name="text">The text to display in the message box.</param>
/// <param name="caption">The text to display in the title bar of the message box.</param>
/// <param name="buttons">One of the MessageBoxButtons values that specifies which buttons to display in the message box.</param>
/// <param name="icon">One of the MessageBoxIcon values that specifies which icon to display in the message box.</param>
/// <param name="defaultButton">One of the MessageBoxDefaultButton values that specifies the default button for the message box.</param>
public static DialogResult ShowDialog(IWin32Window owner, string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defaultButton)
{
if (!MessageBox.IsRunningOnMono) {
lock (_syncRoot) {
if (owner != null) {
using (CbtHook ch = new CbtHook(owner)) {
return (DialogResult)NativeMethods.MessageBox(owner.Handle, text, caption, (uint)buttons | (uint)icon | (uint)defaultButton);
}
} else {
using (CbtHook ch = new CbtHook(null)) {
return (DialogResult)NativeMethods.MessageBox(System.IntPtr.Zero, text, caption, (uint)buttons | (uint)icon | (uint)defaultButton);
}
}
} //lock
} else { //MONO
return System.Windows.Forms.MessageBox.Show(owner, text, caption, buttons, icon, defaultButton, 0);
}
}
