Stylus Messages

A window receives a stylus message whenever a stylus event occurs within the window's client area. When the user presses the stylus to the screen, the window receives a WM_LBUTTONDOWN message. When the stylus is lifted from the screen, the window receives a WM_LBUTTONUP message. A window will receive a WM_LBUTTONDBLCLK instead of a WM_LBUTTONDOWN under the following conditions:

• The window class was registered with the CS_DBLCLKS class style.
• The stylus touches the screen within a certain distance of the last stylus location.
• The stylus touches the screen within a certain time limit after the stylus touched the screen.

If the user moves the stylus while pressing it to the screen, Windows CE generates a WM_MOUSEMOVE message.

Styles input messages supported by Windows CE are described in the following table.

The lParam parameter of a stylus message indicates the position of the stylus tip. The low-order word is the x-coordinate and the high-order word is the y-coordinate. The coordinates are specified in client coordinates. In the client-coordinate system, all points are specified relative to the upper-left corner of the client area.

The wParam parameter contains flags that indicate the status of the other stylus buttons and the CTRL and SHIFT keys at the time of the stylus event. Check for these flags when the way you process a stylus event depends on the state of another stylus button or on the CTRL or SHIFT key. The wParam parameter can be a combination of the following flags.