HP Dx9000 Resources for Developing Touch-Friendly Applications for HP Business - Page 15

Gesture down) Zoom (move two fingers apart or together) Rotate (move two fingers in opposite directions or move one finger pivoting around another finger) Flicks (down and move quickly in a direction) Navigational flicks Flick left Flick right Flick up Flick down Editing flicks Flick up-left diagonal Flick down-left diagonal Flick up-right diagonal Flick down-right diagonal Note: Editing flicks are not enabled by default. You can enabled them by configure Pen and Touch settings in Windows. Equivalent message Control key + mouse scroll wheel Not applicable Forward command Back command Keyboard Scroll Down one screenful Keyboard Scroll Up one screenful Keyboard Delete Keyboard Undo Keyboard Copy Keyboard Paste The following MSDN unmanaged code excerpt shows how to catch and decode gesture messages into a gesture information structure. Basically, you need to check for WM_GESTURE messages, then call GetGestureInfo to retrieve the gesture information from lParam. The field dwID of the gesture information structure will identify the type of gestures. //catch gesture messages in WndProc LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) { //. . . switch (message) { case WM_GESTURE: // Insert handler code here to interpret the gesture. return DecodeGesture(hWnd, message, wParam, lParam); //. . . } //decode gesture messages using GetGestureInfo LRESULT DecodeGesture(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam){ // Create a structure to populate and retrieve the extra message info. GESTUREINFO gi; ZeroMemory(&gi, sizeof(GESTUREINFO)); gi.cbSize = sizeof(GESTUREINFO); 15