CLR custom. Net Control creation (4) -- Response to mouse messages

When the custom view in step 3 is implemented, the original view is overwritten directly.ControlView, resulting in the originalControlThe mouse message cannot be captured, so we need to add some methods to implement the message response.

You can use the message sending method to respond to the mouse message,

Myview. cppFile implementation:

 1   # Include  "  Stdafx. h  "  
  2   # Ifdef _ debug
 3     # Define  New debug_new  
  4     # Endif  
  5   # Include  "  Myview. h  "  
  6   
  7  Implement_dyncreate (cmyview, cview)
  8   
  9   Begin_message_map (cmyview, cview)
  10   On_wm_lbuttondown ()
  11   On_wm_lbuttonup ()
  12   On_wm_rbuttondown ()
  13   On_wm_rbuttonup ()
  14   On_wm_mousemove ()
 15   On_wm_contextmenu ()
  16   On_wm_mbuttondown ()
  17   
  18   End_message_map ()
  19   
  20   Cmyview: cmyview ()
  21   {
  22    //  Todo: Add a structure hereCode  
  23     M_parenthwnd  =  NULL;
  24   M_pcallback  =  NULL;
  25   }
  26   
 27   Cmyview ::  ~  Cmyview ()
  28   {
  29   }
  30   
  31     Void  Cmyview: onlbuttonup (uint nflags, cpoint point)
  32   {
  33  Cmyview: onlbuttonup (nflags, point );
  34     //  Todo: Add message processing hereProgramCode and/or call Default Value  
  35     Long x  =  Point. X;
  36   Long y  =  Point. Y;
  37  Lparam  =  Makelparam (x, y );
  38   : Sendmessage (m_parenthwnd, wm_lbuttonup,  0  , Lparam );
  39   }
  40     //  Other mouse response functions are omitted.
  41     // ...... 

In Myviewcontrol. h Response in the designerMousedownEvent, in System :: void myviwecontrol : myviwecontrol _ mousedown ( System : Object ^ sender , System :< span style =" color: #010001; "> Windows :< span style =" color: #010001; "> forms :< span style =" color: #010001; "> mouseeventargs ^ E ) The corresponding code is added, and the response will be returned, because onlyMousedown,Therefore, to determine whether the left mouse button or right-click, use the ParameterE.

 

For the view created by me, messages from the scroll wheel and keyboard cannot be sent directlyControl, Then I rewrite the message processing function.DefwndprocTo intercept the scroll wheel message.Myviewcontrol. hThe Code is as follows:

 1   Void Myviwecontrol: defwndproc (System: Windows: forms: Message  %  M)
  2   {
  3     Switch  (M. msg)
  4   {
  5     //  Trigger keyboard drop message  
 6       Case  Wm_keydown:
  7   {
  8     This  ->  Focus ();
  9     Switch  (M. wparam. toint32 ())
  10  {
  11     Case  Vk_f5:
  12   MessageBox: Show (  "  F5  "  );
  13     Break  ;
  14   
 15     Default  :
  16     Break  ;
  17   }
  18   }
  19     Case  Wm_keyup:
  20  {
  21   }
  22     Break  ;
  23     //  Trigger the scroll wheel message  
  24       Case  Wm_mousewheel:
 25   {
  26     Short  Zdelta  =  Get_wheel_delta_wparam (M. wparam. toint32 ());  //  Determine scroll wheel direction  
  27       Long  Xpos  = Get_x_lparam (M. lparam. toint32 ());  //  Returns the X value of the current coordinate.  
  28       Long  Ypos  =  Get_y_lparam (M. lparam. toint32 ());  //  Returns the X value of the current coordinate.  
  29    
  30   }
  31     Break  ;
  32   
  33     Default  :
  34     Break  ;
 35   }
  36   Usercontrol: defwndproc (m );
  37   } 

In this way, a rough custom view is complete, and further improvements and optimizations will be made later.