Int32 TaskDialogProc(IntPtr hwnd, UInt32 uNotification, UIntPtr wParam, IntPtr lParam,
IntPtr dwRefData)
{
Int32 result = NativeMethods.S_OK;
// Cast notification value
NativeMethods.TASKDIALOG_NOTIFICATIONS notification =
(NativeMethods.TASKDIALOG_NOTIFICATIONS)uNotification;
// Handle notification
switch (notification) {
case NativeMethods.TASKDIALOG_NOTIFICATIONS.TDN_BUTTON_CLICKED:
// Get button ID
Int32 buttonID = (Int32)wParam;
// Lookup button instance from collection, if necessary
if (Buttons.Count != 0 && buttonID < Buttons.Count) {
TaskDialogButton button = Buttons[buttonID];
// Raise Click event on button
button.RaiseClickEvent();
// Does the button prevent the dialog from closing?
if (button.PreventClose) {
// Note: According to MSDN, one has to return E_FAIL to prevent the task
// dialog from closing, but actually you have to return S_FALSE as using
// E_FAIL will cause the task dialog function to fail.
result = NativeMethods.S_FALSE;
}
}
break;
case NativeMethods.TASKDIALOG_NOTIFICATIONS.TDN_CREATED:
// Set IsActivated property
IsActivated = true;
// Raise Activated event
OnActivated(EventArgs.Empty);
break;
case NativeMethods.TASKDIALOG_NOTIFICATIONS.TDN_DESTROYED:
// Remove handle reference
Handle = IntPtr.Zero;
// Mark as inactive and uninitialized
IsActivated = false;
IsInitialized = false;
// Raise Closed event
OnClosed(EventArgs.Empty);
break;
case NativeMethods.TASKDIALOG_NOTIFICATIONS.TDN_DIALOG_CONSTRUCTED:
// Set Handle property
Handle = hwnd;
// Initialize elements and set IsInitialized property
InitializeElements();
IsInitialized = true;
// Raise Initialized event
OnInitialized(EventArgs.Empty);
break;
case NativeMethods.TASKDIALOG_NOTIFICATIONS.TDN_EXPANDO_BUTTON_CLICKED:
// Set IsExpanded property
IsExpanded = ((Int32)wParam != 0);
// Raise Expanded/Collapsed event according to expansion state
if (expanded) {
OnExpanded(EventArgs.Empty);
} else {
OnCollapsed(EventArgs.Empty);
}
break;
case NativeMethods.TASKDIALOG_NOTIFICATIONS.TDN_HELP:
// Raise Help event
OnHelp(EventArgs.Empty);
break;
case NativeMethods.TASKDIALOG_NOTIFICATIONS.TDN_HYPERLINK_CLICKED:
// Marshal URL string
String url = Marshal.PtrToStringUni(lParam);
// Find corresponding link and raise its Click event
Boolean eventRaised = false;
TaskDialogText taskDialogText;
TaskDialogLink taskDialogLink;
if (Content is TaskDialogText) {
// Check Content for event source
taskDialogText = (TaskDialogText)Content;
foreach (TaskDialogTextElement element in taskDialogText.Contents) {
if (element is TaskDialogLink) {
taskDialogLink = (TaskDialogLink)element;
if (url.Equals(taskDialogLink.Uri.ToString())) {
taskDialogLink.RaiseClickEvent();
eventRaised = true;
break;
}
}
}
if (eventRaised) {
break;
}
}
if (ExpandedInformation is TaskDialogText) {
// Check ExpandedInformation for event source
taskDialogText = (TaskDialogText)ExpandedInformation;
foreach (TaskDialogTextElement element in taskDialogText.Contents) {
if (element is TaskDialogLink) {
taskDialogLink = (TaskDialogLink)element;
if (url.Equals(taskDialogLink.Uri.ToString())) {
taskDialogLink.RaiseClickEvent();
eventRaised = true;
break;
}
}
}
if (eventRaised) {
break;
}
}
if (Footer is TaskDialogText) {
// Check Footer for event source
taskDialogText = (TaskDialogText)Footer;
foreach (TaskDialogTextElement element in taskDialogText.Contents) {
if (element is TaskDialogLink) {
taskDialogLink = (TaskDialogLink)element;
if (url.Equals(taskDialogLink.Uri.ToString())) {
taskDialogLink.RaiseClickEvent();
break;
}
}
}
}
break;
case NativeMethods.TASKDIALOG_NOTIFICATIONS.TDN_RADIO_BUTTON_CLICKED:
// Get radio button ID
Int32 radioButtonID = (Int32)wParam;
// Lookup radio button instance from collection
TaskDialogRadioButton radioButton = RadioButtons[radioButtonID];
// Update IsChecked property
foreach (TaskDialogRadioButton radioBtn in RadioButtons) {
// Remove check state from all but the clicked radio button
if (radioButton != radioBtn) {
radioBtn.IsChecked = false;
}
}
radioButton.IsChecked = true;
// Raise Click event on radio button
radioButton.RaiseClickEvent();
break;
case NativeMethods.TASKDIALOG_NOTIFICATIONS.TDN_TIMER:
// Create and initialize event arguments object
Int32 tickCount = (Int32)wParam;
TaskDialogTimerEventArgs timerEventArgs = new TaskDialogTimerEventArgs(tickCount);
// Raise Timer event
OnTimer(timerEventArgs);
// Check reset property of event arguments
// If set to true by the callee, the timer will be reset
if (timerEventArgs.Reset) {
// Reset indicated by S_FALSE result
result = NativeMethods.S_FALSE;
}
break;
case NativeMethods.TASKDIALOG_NOTIFICATIONS.TDN_VERIFICATION_CLICKED:
// Check verification property
verificationChecked = ((Int32)wParam != 0);
// Raise VerificationChanged event
OnVerificationChanged(EventArgs.Empty);
break;
}
return result;
}
/// <summary>
/// Raises the <see cref="Timer"/> event.
/// </summary>
/// <param name="e">An <see cref="TaskDialogTimerEventArgs"/> object that contains the
/// timer event data.</param>
protected virtual void OnTimer(TaskDialogTimerEventArgs e)
{
EventHandler<TaskDialogTimerEventArgs> handler = timerEventHandler;
if (handler != null) {
handler(this, e);
}
}