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Make the scrollbar draggable in SDL

This commit is contained in:
Lior Halphon 2022-07-17 19:57:29 +03:00
parent cbf1a5481f
commit 96b5306ff3
1 changed files with 46 additions and 2 deletions
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48
SDL/gui.c
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@ -1500,6 +1500,10 @@ void run_gui(bool is_running)
recalculate_menu_height();
current_selection = 0;
scroll = 0;
bool scrollbar_drag = false;
signed scroll_mouse_start = 0;
signed scroll_start = 0;
while (true) {
SDL_WaitEvent(&event);
/* Convert Joypad and mouse events (We only generate down events) */
@ -1508,6 +1512,9 @@ void run_gui(bool is_running)
case SDL_WINDOWEVENT:
should_render = true;
break;
case SDL_MOUSEBUTTONUP:
scrollbar_drag = false;
break;
case SDL_MOUSEBUTTONDOWN:
if (gui_state == SHOWING_HELP) {
event.type = SDL_KEYDOWN;
@ -1521,6 +1528,23 @@ void run_gui(bool is_running)
signed x = event.button.x;
signed y = event.button.y;
convert_mouse_coordinates(&x, &y);
if (x >= 160 - 6 && x < 160 && menu_height > 144) {
unsigned scrollbar_offset = (140 - scrollbar_size) * scroll / (menu_height - 144);
if (scrollbar_offset + scrollbar_size > 140) {
scrollbar_offset = 140 - scrollbar_size;
}
if (y < scrollbar_offset || y > scrollbar_offset + scrollbar_size) {
scroll = (menu_height - 144) * y / 143;
should_render = true;
}
scrollbar_drag = true;
mouse_scroling = true;
scroll_mouse_start = y;
scroll_start = scroll;
break;
}
y += scroll;
if (x < 0 || x >= 160 || y < 24) {
@ -1711,8 +1735,28 @@ void run_gui(bool is_running)
break;
}
case SDL_MOUSEMOTION: {
if (scrollbar_drag && scrollbar_size < 140 && scrollbar_size > 0) {
signed x = event.motion.x;
signed y = event.motion.y;
convert_mouse_coordinates(&x, &y);
signed delta = scroll_mouse_start - y;
scroll = scroll_start - delta * (signed)(menu_height - 144) / (signed)(140 - scrollbar_size);
if (scroll < 0) {
scroll = 0;
}
if (scroll >= menu_height - 144) {
scroll = menu_height - 144;
}
should_render = true;
}
break;
}
case SDL_KEYDOWN:
scrollbar_drag = false;
if (gui_state == WAITING_FOR_KEY) {
if (current_selection > 8) {
configuration.keys_2[current_selection - 9] = event.key.keysym.scancode;
@ -1912,10 +1956,10 @@ void run_gui(bool is_running)
for (unsigned y = 0; y < 140; y++) {
uint32_t *pixel = pixels + x_offset + 156 + width * (y + y_offset + 2);
if (y >= scrollbar_offset && y < scrollbar_offset + scrollbar_size) {
pixel[0] = pixel[1]= gui_palette_native[2];
pixel[0] = pixel[1] = gui_palette_native[2];
}
else {
pixel[0] = pixel[1]= gui_palette_native[1];
pixel[0] = pixel[1] = gui_palette_native[1];
}
}