OpenEuphoria

RE: SS_NOTIFY and mouse clicks

• Posted by Derek Parnell <ddparnell at bigpond.com> Nov 09, 2004
• 504 views

Andy Drummond wrote:
> 
> 
> Derek Parnell wrote:
> > 
> > 
> > posted by: Derek Parnell <ddparnell at bigpond.com>
> > 
> > Tommy Carlier wrote:
> > > 
> > > Derek Parnell wrote:
> > > > What's an "unclick" event? A click event is a combination of Mousedown
> > > > followed by MouseUp, within the double-click period, and within a few
> > > > pixels of each other.
> > > 
> > > Why does it have to be within the double-click period? If I press down
> > > the mouse button, I wait a second, and release the button without moving
> > > the mouse, shouldn't that count as a click?
> > 
> > Maybe. On things like buttons and menus, things that have a specific 
> > Microsoft generated click event, the time delay is not significant. But 
> > on
> > things like bitmaps, windows, labels etc... it might be.
> > 
> > To me the 'concept' of a click is a short-sharp action (relatively 
> > speaking)
> > which is different from a mouse up/down event. THat's why I choose to 
> > implement it this way.
> > 
> > > Certain people have heavy fingers, and when they press down a mouse 
> > > button,
> > > it's physically tough to lift their heavy finger to release the button.
> > > 
> > > I think it is important to make your applications accessible, also for
> > > people with heavy fingers.
> > 
> > Such people already tend to have set their double-click period to a
> > reasonable length for themselves. 
> > 
> > However, I can easily set up Win32lib so that the coder has a choice 
> > over
> > this aspect of a click event. It'll be in the next version for you.
> > 
> > -- 
> > Derek Parnell
> > Melbourne, Australia
> 
> Ah well, what I ought to have said is that this application is actually
> for a touch-screen monitor where the touch screen output looks like
> mouse-button-down followed a few thinks later by mouse-button-up.
> I looked at the event & params[] fields when the handler was called
> and they were zero and null for all clicks.

It sounds like a terminology issue. Pushing the mouse button and 
releasing the mouse button are not "clicks". A "click" is the combination
of the two events. It also sounds lke you are using w32HClick event
and expecting that to show you information about the mouse state. That
event was never designed to do that. 

> Hence the problem.
> BTW, I'm using Judith's IDE and just set a text field as "Clickable",
> that's how I got into this problem.  I would use Windows buttons
> but setting their background colours on an ad-hoc basis is not nice.
> Besides I can make nice fancy buttons by drawing them myself ;)
> 
> So - if the next version of Win32Lib (which is SOOOOOooo useful) gives
> me the ability to select which mouse events I want that would be great. 
> So do I hold my breath? Any ideas when it might appear?

It already has this. Just use the w32HMouse event instead of w32HClick.
This event gives you the mouse state, including which button was used,
whether it was a down/up/double-click/move/wheel, its X/Y position,
plus the state of the Control-Shift-Alt keys at the time. Read the
docs for more detail.

procedure Mouse_Field(integer self, integer event, sequence parms)
  if parms[1] = WM_LBUTTONDOWN then
      . . . 
  elsif parms[1] = WM_LBUTTONUP then
      . . .
  end if
end procedure
setHandler(TextField, w32HMouse, routine_id("Mouse_Field"))

-- 
Derek Parnell
Melbourne, Australia