How to distinguish between "mouse click" and "double-click mouse" in Win32"

When writing a Win32 program today, I encountered a problem, that is, when I responded to the double-click event, I first responded to the event. So I made up my mind to solve this problem. Later, I realized that double-clicking is composed of two mouse clicks, But windows judges the time when the two mouse clicks, if the two mouse clicks within ms, double-click event. If it exceeds 200 ms, it indicates two single-host events of the mouse. So how does one not respond to the mouse click event while responding to double-clicking the mouse? That is, to filter out mouse click events. There are two methods to achieve this.

 

(1) Add the following filter conditions to the Message response wm_lbuttondown.

DWORD st;

DWORD et;

MSG;

St = gettickcount ();

While (1)

{

If (: peekmessage (& MSG, null, 0, 0, pm_remove ))

{

: Translatemessage (& MSG );

: Disatchmessage (& MSG );}

If (wm_lbuttondblclk = MSG. Message)

{

Return defwindowproc (hwnd, message, wparam, lparam );

}

ET = gettickcount (); If (ET-ST> 200) break ;}

In this way, when you respond to a message that is double-clicked, the response is not responded.

 

(2) Use sleep (getdoubleclicktime () to add

Static bool flag = false;

Sleep (getdoubleclicktime ());

If (FLAG) {return 0 ;}

Flag = false;

Add the following content to wm_lbuttondblclk:

Flag = true;

The purpose is: When you double-click the mouse, the message response wm_lbuttondown is first entered,

After sleep (getdoubleclicktime,

The message response enters the wm_lbuttondblclk. At this time, the flag becomes true,

After sleep ends, the Message continues to return to lbuttondown,

In this case, if the flag value is true, return. I hope this article will help people who need it solve the problem.