Mouse Over

SDL Development
1

I am looking to create a tool tip for a button on a windows application,
and I have seen that the SDL documentation only refers to mouse button
events and not mouse motion events. Is this information hidden within
the SDL API, or will I need some other mechanism to display these tool
tips?

When I refer to a tool tip, I am talking about the ability to display
the use of a tool by holding the mouse cursor over the button and not
having to invoke it.
Robert

2

The ‘intro’ docs at libsdl.org mention this…

http://www.libsdl.org/intro/usingevents.html

* Polling event state

  In addition to handling events directly, each type of event has
  a function which allows you to check the application event state. If
  you use this exclusively, you should ignore all events with the
  SDL_EventState() function, and call SDL_PumpEvents() periodically to
  update the application event state.

  Example:

  {
      SDL_EventState(SDL_MOUSEMOTION, SDL_IGNORE);
  }
  
  void CheckMouseHover(void)
  {
      int mouse_x, mouse_y;
  
      SDL_PumpEvents();
  
      SDL_GetMouseState(&mouse_x, &mouse_y);
      if ( (mouse_x < 32) && (mouse_y < 32) ) {
          printf("Mouse in upper left hand corner!\n");
      }
  }

… Might be useful chunk of code :slight_smile:

The SDL doc project specifically mentions SDL_MouseMotionEvent…

http://sdldoc.csn.ul.ie/eventstructures.php

http://sdldoc.csn.ul.ie/sdlmousemotionevent.php

I use mouse motion in Tux Paint to change the mouse pointer shape
(e.g., tool-specific shape when over the canvase, ‘hand’ shape when over
clickable buttons, arrow shape otherwise). I don’t do Tool Tips, tho…

Good luck!

-bill!
bill at newbreedsoftware.com "Hey Shatner, ya remember that episode of
http://newbreedsoftware.com/bill/ Space Trek where your show got cancelled?"On Mon, Feb 09, 2004 at 02:21:37PM -0600, Robert Diel wrote:

I am looking to create a tool tip for a button on a windows application,
and I have seen that the SDL documentation only refers to mouse button
events and not mouse motion events. Is this information hidden within
the SDL API, or will I need some other mechanism to display these tool
tips?

3

I am looking to create a tool tip for a button on a windows application,
and I have seen that the SDL documentation only refers to mouse button
events and not mouse motion events. Is this information hidden within
the SDL API, or will I need some other mechanism to display these tool

SDL does include mouse motion events, and they definitely are included in
the documentation.

However, for your purposes SDL_GetMouseState might well be more
appropriate, as it returns (via pointer arguments) the coordinates of the
mouse rather than a relative distance of mouse motion.

JamesOn Mon, 09 Feb 2004 14:21:37 -0600, Robert Diel wrote:
4

Worked like a charm… Thank you all.On Mon, 2004-02-09 at 15:49, James Gregory wrote:

On Mon, 09 Feb 2004 14:21:37 -0600, Robert Diel wrote:

I am looking to create a tool tip for a button on a windows application,
and I have seen that the SDL documentation only refers to mouse button
events and not mouse motion events. Is this information hidden within
the SDL API, or will I need some other mechanism to display these tool

SDL does include mouse motion events, and they definitely are included in
the documentation.

However, for your purposes SDL_GetMouseState might well be more
appropriate, as it returns (via pointer arguments) the coordinates of the
mouse rather than a relative distance of mouse motion.

James

SDL mailing list
SDL at libsdl.org
http://www.libsdl.org/mailman/listinfo/sdl

5

Hi,

James Gregory wrote:

However, for your purposes SDL_GetMouseState might well be more
appropriate, as it returns (via pointer arguments) the coordinates of the
mouse rather than a relative distance of mouse motion.

SDL_MouseMotionEvent also contains absolute x and y coordinates, besides
the relative movement and the button state. See
http://sdldoc.csn.ul.ie/sdlmousemotionevent.php

Sebastian