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Detecting mouse exiting window while button pressed

Started by robinei Aug 20, 2009 at 9:54 AM 4 replies 2k views

Original Post

Aug 20, 2009 at 9:54 AM

I need to do this to get right behaviour for GUI widgets at or near the edge of the window. This seems impossible to to with SDL, because mouse coordinates are always within the window, and mouse focus is only lost when the button is released(outside the window). Are there any other lightweight cross-platform window and input handling frameworks that can handle this?

fcoelho

Aug 20, 2009 at 11:48 AM

You can check for SDL_ACTIVEEVENT in the event loop. It is generated regardless of mouse button state.

robinei

Aug 20, 2009 at 12:01 PM

That is exactly my problem. It is _not_ generated while the mouse button is down, on windows at least. When I release outside the window, the release event arrives, and _then_ the SDL_ACTIVEEVENT SDL_APPMOUSEFOCUS event arrives, telling me that mouse focus was lost.

fcoelho

Aug 20, 2009 at 12:44 PM

Quote:
on windows at least

Well, I've tried this on Linux, so that might be the culprit..

#include <stdio.h>#include <SDL/SDL.h>int main(int argc, char *argv[]){       SDL_Surface *tela;        SDL_Init(SDL_INIT_EVERYTHING);        tela = SDL_SetVideoMode(400,300,32, SDL_HWSURFACE|SDL_DOUBLEBUF);       while (1)    {           SDL_Event event;        while (SDL_PollEvent(&event))        {               if (event.type == SDL_KEYDOWN)                if (event.key.keysym.sym == SDLK_ESCAPE)                    exit(0);            if (event.type == SDL_ACTIVEEVENT)                printf("gain %d\n", event.active.gain);        }    }}

robinei

Aug 20, 2009 at 1:55 PM

Ah, then maybe a bug report should be in order.

fcoelho

Aug 21, 2009 at 12:49 PM

About the "other lightweight cross-platform window and input handling frameworks", you can use SFML. There are a MouseEntered and MouseLeft events, which works on Windows also.

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