/* ----------------------------------------------------------------------------
* Moves the scrollbar's button to the desired coordinates.
* The coordinates specify the center.
*/
void scrollbar::move_button(int x, int y) {
if(low_value == high_value) return;
button* but = (button*) widgets["but_bar"];
if(vertical) {
int bh = but->y2 - but->y1;
int h = y2 - y1;
but->y1 = y - (but->y2 - but->y1) / 2;
if(but->y1 < y1) but->y1 = y1;
if(but->y1 + bh > y2) but->y1 = y2 - bh;
but->y2 = but->y1 + bh;
low_value = min_value + ((but->y1 - y1) / (float) h) * (max_value - min_value);
high_value = min_value + ((but->y2 - y1) / (float) h) * (max_value - min_value);
} else {
int bw = but->x2 - but->x1;
int w = x2 - x1;
but->x1 = x - (but->x2 - but->x1) / 2;
if(but->x1 < x1) but->x1 = x1;
if(but->x1 + bw > x2) but->x1 = x2 - bw;
but->x2 = but->x1 + bw;
low_value = min_value + ((but->x1 - x1) / (float) w) * (max_value - min_value);
high_value = min_value + ((but->x2 - x1) / (float) w) * (max_value - min_value);
}
if(change_handler) change_handler(this);
}
/* ----------------------------------------------------------------------------
* Sets the scrollbar's current value.
*/
void scrollbar::set_value(float new_low, bool call_handler) {
float dif = high_value - low_value;
if(new_low < min_value || new_low + dif > max_value) return;
button* but = (button*) widgets["but_bar"];
if(!but) return;
low_value = new_low;
high_value = new_low + dif;
float ratio = (low_value - min_value) / (max_value - min_value - dif);
if(vertical) {
int but_h = but->y2 - but->y1;
but->y1 = y1 + ratio * ((y2 - y1) - but_h);
but->y2 = but->y1 + but_h;
} else {
int but_w = but->x2 - but->x1;
but->x1 = x1 + ratio * ((x2 - x1) - but_w);
but->x2 = but->x1 + but_w;
}
if(change_handler && call_handler) change_handler(this);
}
/* ----------------------------------------------------------------------------
* Calls the function that handles a change of the text.
*/
void textbox::call_change_handler() { if(change_handler) change_handler(this); }
