My app should always minimize to the system tray, instead of to the task bar.
To do so, I handle WM_SYSCOMMAND/SC_MINIMIZE:
case WM_SYSCOMMAND:
switch (wParam)
{
case SC_MINIMIZE:
minimizeToTray();
return FALSE;
...
This, however, does not cover events where the window gets minimized without a WM_SYSCOMMAND.
For example: I can minimize the window by using Win+D (show desktop).
To cover this case, I handle WM_ACTIVATE/WA_INACTIVE:
case WM_ACTIVATE:
{
if (LOWORD(wParam) == WA_INACTIVE && HIWORD(wParam) != 0)
{
minimizeToTray();
}
...
Which seems to only work if the window is active before showing the desktop.
Problems:
When the window is already inactive, no WM_ACTIVATE comes in to detect minimization. Which message tells me that the inactive window gets minimized?
EDIT: It seems that WM_WINDOWPOSCHANGED is the right place to check if the window is minimized, when it is not active.
Furthermore, when I activate some other app that is maximized, fully covering my own app, I also want to minimize to tray, but don't know if there's a message to handle in that case. The high word of the wParam for WM_ACTIVATE is 0 in that case (like it would also be if the window was just deactivated but still visible).
