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Fix for multitouch causing issues

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This commit is contained in:
seibelj 2017-01-03 11:13:46 -05:00
parent 4e3689a774
commit bde7c3c4e9
1 changed files with 27 additions and 5 deletions
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32
demo/allegro5/nuklear_allegro5.h
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@ -56,6 +56,8 @@ static struct nk_allegro5 {
ALLEGRO_DISPLAY *dsp;
unsigned int width;
unsigned int height;
int is_touch_down;
int touch_down_id;
struct nk_context ctx;
struct nk_buffer cmds;
} allegro5;
@ -309,27 +311,45 @@ nk_allegro5_handle_event(ALLEGRO_EVENT *ev)
}
nk_input_button(ctx, button, ev->mouse.x, ev->mouse.y, ev->type == ALLEGRO_EVENT_MOUSE_BUTTON_DOWN);
} break;
/* This essentially converts touch events to mouse events */
case ALLEGRO_EVENT_TOUCH_BEGIN:
case ALLEGRO_EVENT_TOUCH_END: {
if (ev->touch.display != allegro5.dsp) {
return;
}
/* We only acknowledge one touch at a time. Otherwise, each touch
would be manipulating multiple nuklear elements, as if there
were multiple mouse cursors */
if (allegro5.is_touch_down && allegro5.touch_down_id != ev->touch.id) {
return;
}
if (ev->type == ALLEGRO_EVENT_TOUCH_BEGIN) {
// FIXME: This is a hack to properly simulate
// touches as a mouse with nuklear. If you instantly jump
// from one place to another without an nk_input_end(), it
// confuses the nuklear state. nuklear expects smooth mouse
// movements, which is unlike a touch screen
allegro5.is_touch_down = 1;
allegro5.touch_down_id = ev->touch.id;
/* FIXME: This is a hack to properly simulate
touches as a mouse with nuklear. If you instantly jump
from one place to another without an nk_input_end(), it
confuses the nuklear state. nuklear expects smooth mouse
movements, which is unlike a touch screen */
nk_input_motion(ctx, (int)ev->touch.x, (int)ev->touch.y);
nk_input_end(ctx);
nk_input_begin(ctx);
}
else {
allegro5.is_touch_down = 0;
allegro5.touch_down_id = -1;
}
nk_input_button(ctx, NK_BUTTON_LEFT, (int)ev->touch.x, (int)ev->touch.y, ev->type == ALLEGRO_EVENT_TOUCH_BEGIN);
} break;
case ALLEGRO_EVENT_TOUCH_MOVE: {
if (ev->touch.display != allegro5.dsp) {
return;
}
/* Only acknowledge movements of a single touch, we are
simulating a mouse cursor */
if (!allegro5.is_touch_down || allegro5.touch_down_id != ev->touch.id) {
return;
}
nk_input_motion(ctx, (int)ev->touch.x, (int)ev->touch.y);
} break;
case ALLEGRO_EVENT_KEY_DOWN:
@ -442,6 +462,8 @@ nk_allegro5_init(NkAllegro5Font *allegro5font, ALLEGRO_DISPLAY *dsp, unsigned in
allegro5.dsp = dsp;
allegro5.width = width;
allegro5.height = height;
allegro5.is_touch_down = 0;
allegro5.touch_down_id = -1;
nk_init_default(&allegro5.ctx, font);
allegro5.ctx.clip.copy = nk_allegro5_clipboard_copy;