/// <summary>
/// Dispatches a window message so that the appropriate events
/// can be invoked. This is used for the Taskbar's thumbnail toolbar feature.
/// </summary>
/// <param name="m">The window message, typically obtained
/// from a Windows Forms or WPF window procedure.</param>
/// <param name="taskbarWindow">Taskbar window for which we are intercepting the messages</param>
/// <returns>Returns true if this method handles the window message</returns>
internal bool DispatchMessage(ref Message m, TaskbarWindow taskbarWindow)
{
if (m.Msg == (int)TaskbarNativeMethods.WM_TASKBARBUTTONCREATED)
{
AddButtons(taskbarWindow);
}
else
{
if (!_buttonsAdded)
{
AddButtons(taskbarWindow);
}
switch (m.Msg)
{
case TaskbarNativeMethods.WM_COMMAND:
if (CoreNativeMethods.HIWORD(m.WParam.ToInt64(), 16) == THUMBBUTTON.THBN_CLICKED)
{
int buttonId = CoreNativeMethods.LOWORD(m.WParam.ToInt64());
foreach (var button in taskbarWindow.ThumbnailButtons)
{
if (button.Id == buttonId)
{
button.FireClick(taskbarWindow);
}
}
}
break;
} // End switch
} // End else
return(false);
}
/// <summary>
/// The window manager should call this method to raise the public click event to all
/// the subscribers.
/// </summary>
internal void FireClick(TaskbarWindow window)
{
var e = Click;
if (e != null)
{
e(this, EventArgs.Empty);
}
}
void AddButtons(TaskbarWindow taskbarWindow)
{
// Add the buttons
// Get the array of thumbnail buttons in native format
var nativeButtons = Array.ConvertAll(taskbarWindow.ThumbnailButtons, i => i.Win32ThumbButton);
// Add the buttons on the taskbar
var hr = TaskbarManager.Instance.TaskbarList.ThumbBarAddButtons(taskbarWindow.WindowHandle, (uint)taskbarWindow.ThumbnailButtons.Length, nativeButtons);
if (!CoreErrorHelper.Succeeded((int)hr))
{
Marshal.ThrowExceptionForHR((int)hr);
}
// Set the window handle on the buttons (for future updates)
_buttonsAdded = true;
Array.ForEach(taskbarWindow.ThumbnailButtons, UpdateHandle);
}
public void AddThumbnailButtons(IntPtr windowHandle, ThumbnailToolbarButton[] buttons)
{
// Try to get an existing taskbar window for this user windowhandle,
// or get one that is created for us
var taskbarWindow = GetTaskbarWindow(windowHandle);
if (taskbarWindow == null)
{
taskbarWindow = new TaskbarWindow(windowHandle, buttons);
_taskbarWindowList.Add(taskbarWindow);
}
else if (taskbarWindow.ThumbnailButtons == null)
{
taskbarWindow.ThumbnailButtons = buttons;
}
else
{
// We already have buttons assigned
throw new InvalidOperationException("Toolbar buttons for this window are already added. Once added, neither the order of the buttons cannot be changed, nor can they be added or removed.");
}
}