static struct resizor *
resizor_create(struct display *display)
{
struct resizor *resizor;
int32_t height;
resizor = malloc(sizeof *resizor);
if (resizor == NULL)
return resizor;
memset(resizor, 0, sizeof *resizor);
resizor->window = window_create(display, "Wayland Resizor", 500, 400);
resizor->display = display;
window_set_key_handler(resizor->window, key_handler);
window_set_user_data(resizor->window, resizor);
window_set_redraw_handler(resizor->window, redraw_handler);
window_set_keyboard_focus_handler(resizor->window,
keyboard_focus_handler);
resizor->width = 300;
resizor->height.current = 400;
resizor->height.previous = resizor->height.current;
resizor->height.target = resizor->height.current;
height = resizor->height.current + 0.5;
window_set_child_size(resizor->window, resizor->width, height);
resizor_draw(resizor);
return resizor;
}
static void
frame_callback(void *data, uint32_t time)
{
struct resizor *resizor = data;
double force, height;
height = resizor->height.current;
force = (resizor->height.target - height) / 10.0 +
(resizor->height.previous - height);
resizor->height.current =
height + (height - resizor->height.previous) + force;
resizor->height.previous = height;
if (resizor->height.current >= 400) {
resizor->height.current = 400;
resizor->height.previous = 400;
}
if (resizor->height.current <= 200) {
resizor->height.current = 200;
resizor->height.previous = 200;
}
window_set_child_size(resizor->window, resizor->width, height + 0.5);
window_schedule_redraw(resizor->window);
}
static void
resize_handler(struct window *window,
int32_t width, int32_t height, void *data)
{
struct gears *gears = data;
/* Constrain child size to be square and at least 300x300 */
if (width > height)
height = width;
else
width = height;
if (width < 300) {
width = 300;
height = 300;
}
window_set_child_size(gears->window, width, height);
}