PureBasic Forums - English

Posted: **Wed Dec 25, 2013 7:15 pm**

How can I get an event from a TrackBarGadget?
In this example I get the event tree times.

Is there a way to check the mouse button release?

Thanks for help

Code: Select all

If OpenWindow(0, 0, 0, 320, 200, "TrackBarGadget", #PB_Window_SystemMenu | #PB_Window_ScreenCentered)
  TrackBarGadget(0, 10,  40, 250, 20, 0, 10, #PB_TrackBar_Ticks)
  
  
  Repeat
    Event = WaitWindowEvent()
    Select Event
      Case #PB_Event_Gadget
        Select EventGadget()
          Case 0
            Debug GetGadgetState(0)
        EndSelect
      Case  #PB_Event_CloseWindow
        close = #True
    EndSelect
    
  Until close = #True
EndIf

Posted: **Thu Dec 26, 2013 11:44 am**

Wolfram wrote:How can I get an event from a TrackBarGadget?
In this example I get the event tree times.

Actually you get more events when you move more ticks.

1st event seems to be mouse button down.
Next events are one event for each tick moved.
Last event seems to be mouse button up event.

Unfortunately EventType() is not supported for TrackBarGadget.

You see the behavior better when using BindGadgetEvent() and doing it slowly:
- mouse button down -> event fired
- move slider -> event for each movement
- mouse button up -> event fired

Doing event handling in the main event loop, all this events get collected
and fire after releasing the mouse button. So you get at least 3 events,
and if you move more ticks, you get even more events.

Code: Select all

Procedure onTrackbarChange()
    Debug "State: "+GetGadgetState(0)+" EventType: "+EventType()
EndProcedure

If OpenWindow(0, 0, 0, 320, 200, "TrackBarGadget", #PB_Window_SystemMenu | #PB_Window_ScreenCentered)
  TrackBarGadget(0, 10,  40, 250, 20, 0, 10, #PB_TrackBar_Ticks)
  
  BindGadgetEvent(0,@onTrackbarChange())
  
  Repeat
    Event = WaitWindowEvent()
    Select Event
      Case #PB_Event_Gadget
        Select EventGadget()
          Case 0
            ;Debug "State: "+GetGadgetState(0)+" EventType: "+EventType()
        EndSelect
      Case  #PB_Event_CloseWindow
        close = #True
    EndSelect
    
  Until close = #True
EndIf

Posted: **Thu Dec 26, 2013 7:52 pm**

Wolfram wrote:How can I get an event from a TrackBarGadget?
In this example I get the event tree times.

Is there a way to check the mouse button release?

With a small trick you will only obtain a single event on releasing the left mouse button:

Code: Select all

EnableExplicit

#NSLeftMouseUp     = 2
#NSLeftMouseUpMask = 1 << #NSLeftMouseUp

OpenWindow(0, 270, 100, 280, 100, "Detect release of mouse button")
TrackBarGadget(0, 10, 40, WindowWidth(0) - 20, 25, 1, 20, #PB_TrackBar_Ticks)
CocoaMessage(0, GadgetID(0), "sendActionOn:", #NSLeftMouseUpMask)

Repeat
  Select WaitWindowEvent()
    Case #PB_Event_CloseWindow
      Break
    Case #PB_Event_Gadget
      If EventGadget() = 0
        Debug "Left mouse button released on value " + Str(GetGadgetState(0))
      EndIf
  EndSelect
ForEver

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