Momentary switch

[adriano08]

Hi,

I'm new to CVI.
Any way to implement a push button with momentary action?
Only turn on when click on button, off upon release it.

Any example can I refer to?

[ElectroLund]

The "Command button" does just this.  It's momentary.  

Or if you prefer, you could use any of the "Toggle buttons" or "Binary switches" and get this behavior by using a combination of the EVENT_LEFT_CLICK and EVENT_LEFT_CLICK_UP.  When you get the click up event, you could forcibly reset the switch control's position back to OFF.

[adriano08]

Hi,

I followed using  EVENT_LEFT_CLICK and EVENT_LEFT_CLICK_UP to light a LED.

But when I press the toggle button, the button did not respond properly. Some lag occur & button only depress when click on its label. Only when double-clicking the button, it will then depress.

 switch (event)
 {
  case EVENT_LEFT_CLICK:
   SetCtrlVal(panelHandle, PANEL_LED, 1);
   SetCtrlVal(panelHandle, PANEL_TOGGLEBUTTON_2, 1);
   break;
   
  case EVENT_LEFT_CLICK_UP:
   SetCtrlVal(panelHandle, PANEL_LED, 0);
   SetCtrlVal(panelHandle, PANEL_TOGGLEBUTTON_2, 0);
   break;
    
 }
 return 0;

[ElectroLund]

Yes, that would be normal behavior for a Toggle button.  Toggles are not momentary: they keep their state.  But to get behavior you want, I've made you a sample project, with both Command and Toggle buttons: