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Mouse And Keyboard, Timer event

Week 3 C For Win Lecture :. Mouse And Keyboard, Timer event. Mouse Message Keyboard Message. Contents. Windows uses a number of different messages involving the mouse. These message fall into two categories : Client-area mouse messages Nonclient -area mouse messages

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Mouse And Keyboard, Timer event

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  1. Week 3 C For Win Lecture : Mouse And Keyboard, Timer event

  2. Mouse Message Keyboard Message Contents

  3. Windows uses a number of different messages involving the mouse. • These message fall into two categories : • Client-area mouse messages • Nonclient-area mouse messages • Mouse Events will be learned : • The press and release of a mouse button • The double click of a mouse button • The movement of a mouse Mouse message

  4. Client-Area Mouse Messages Mouse message

  5. Nonclient-Area Mouse Messages Mouse message

  6. The press and release of a mouse button: • Mouse-Down Messages: User locate a position and press a left or right or middle mouse button. The message will be sent • Mouse-Up Messages: After pressing a mouse button, user release it. A mouse-up message is sent Example : WM_LBUTTONDOWN  WM_LBUTTONUP WM_RBUTTONDOWN  WM_RBUTTONUP Mouse message

  7. The syntax of mouse-down(up)messages is : • afx_msg void OnxButtonDown(UINT nFlags, CPoint point); • afx_msg void OnxButtonUp(UINT nFlags, CPoint point); Meanings : • x : replaced with L(left), R(Right), or M(Middle) • point : identify the location of the cursor • nFlags : state of mouse button Mouse message

  8. Example : Mouse message

  9. The double click of a mouse button • When two clicks of the same button occur within a very short period of time. • The second button-down message will be replaced by a WM_xBUTTONDBLCLK message Mouse message the window's WNDCLASS includes the class style CS_DBLCLKS

  10. The movement of a mouse: • After pressing one of mouse buttons, depending on the requirement, the user may not need to immediately release button. User can drag and move mouse to a new position. At that time the message WM_MOUSEMOVE is sent continuously • nFlags Indicates whether various virtual keys are down Mouse message

  11. Example : BOOL m_bTracking ; CPoint m_ptTo; CPoint m_ptFrom; OnInitDialog : m_bTracking = FALSE; Mouse message

  12. Each key in our keyboard has a code that OS can regconize KeyBOARD MESSAGE

  13. The Key-Down Effect : • When user press a key, the message WM_KEYDOWN is sent • The syntax : void OnKeyDown(UINT nChar, UINT nRepCnt,UINT nFlags ); nChar : specify the virtual code of the key that was pressed nRepCnt : specify the number of times counted repeatedly as the key was held down. nFlags : specify the scan code, extended-key flag, context code, previous key-state flag, and transition-state flag. KeyBOARD MESSAGE

  14. If user need to use keyboard message. Do two steps : • Step 1: Add details to function PreTranslateMessage • Step 2: Check nChar in OnKeyDown function to do something OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags) if (nChar == ‘{kýtự}') {do yourself } (Ex: ‘A’,’B’,’1’,…) if (nChar == {Mãkýtựảo}) {do yourseft } KeyBOARD MESSAGE

  15. Example: int NumofLetter[30]; OnInitDialog : for(int i = 0; i < 30 ; i++) NumofLetter[i] = 0; KeyBOARD MESSAGE

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