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Scrollbar and mouse wheel support

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This commit is contained in:
Lior Halphon 2020-12-26 03:20:53 +02:00
parent 6d5ce6c54d
commit c471696fbb
1 changed files with 68 additions and 3 deletions
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71
SDL/gui.c
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@ -197,7 +197,7 @@ static void draw_char(uint32_t *buffer, unsigned width, unsigned height, unsigne
}
}
static unsigned scroll = 0;
static signed scroll = 0;
static void draw_unbordered_text(uint32_t *buffer, unsigned width, unsigned height, unsigned x, unsigned y, const char *string, uint32_t color)
{
y -= scroll;
@ -262,6 +262,10 @@ struct menu_item {
};
static const struct menu_item *current_menu = NULL;
static const struct menu_item *root_menu = NULL;
static unsigned menu_height;
static unsigned scrollbar_size;
static bool mouse_scroling = false;
static unsigned current_selection = 0;
static enum {
@ -303,6 +307,23 @@ static void open_rom(unsigned index)
}
}
static void recalculate_menu_height(void)
{
menu_height = 24;
scrollbar_size = 0;
if (gui_state == SHOWING_MENU) {
for (const struct menu_item *item = current_menu; item->string; item++) {
menu_height += 12;
if (item->backwards_handler) {
menu_height += 12;
}
}
}
if (menu_height > 144) {
scrollbar_size = 144 * 140 / menu_height;
}
}
static const struct menu_item paused_menu[] = {
{"Resume", NULL},
{"Open ROM", open_rom},
@ -323,6 +344,7 @@ static void return_to_root_menu(unsigned index)
current_menu = root_menu;
current_selection = 0;
scroll = 0;
recalculate_menu_height();
}
static void cycle_model(unsigned index)
@ -434,6 +456,7 @@ static void enter_emulation_menu(unsigned index)
current_menu = emulation_menu;
current_selection = 0;
scroll = 0;
recalculate_menu_height();
}
const char *current_scaling_mode(unsigned index)
@ -739,6 +762,7 @@ static void enter_graphics_menu(unsigned index)
current_menu = graphics_menu;
current_selection = 0;
scroll = 0;
recalculate_menu_height();
}
const char *highpass_filter_string(unsigned index)
@ -800,6 +824,7 @@ static void enter_audio_menu(unsigned index)
current_menu = audio_menu;
current_selection = 0;
scroll = 0;
recalculate_menu_height();
}
static void modify_key(unsigned index)
@ -841,6 +866,7 @@ static void enter_controls_menu(unsigned index)
current_menu = controls_menu;
current_selection = 0;
scroll = 0;
recalculate_menu_height();
}
static unsigned joypad_index = 0;
@ -976,6 +1002,7 @@ static void enter_joypad_menu(unsigned index)
current_menu = joypad_menu;
current_selection = 0;
scroll = 0;
recalculate_menu_height();
}
joypad_button_t get_joypad_button(uint8_t physical_button)
@ -1060,6 +1087,7 @@ void run_gui(bool is_running)
gui_state = is_running? SHOWING_MENU : SHOWING_DROP_MESSAGE;
bool should_render = true;
current_menu = root_menu = is_running? paused_menu : nonpaused_menu;
recalculate_menu_height();
current_selection = 0;
scroll = 0;
do {
@ -1247,6 +1275,23 @@ void run_gui(bool is_running)
}
break;
}
case SDL_MOUSEWHEEL: {
if (menu_height > 144) {
scroll -= event.wheel.y;
if (scroll < 0) {
scroll = 0;
}
if (scroll >= menu_height - 144) {
scroll = menu_height - 144;
}
mouse_scroling = true;
should_render = true;
}
break;
}
case SDL_KEYDOWN:
if (event_hotkey_code(&event) == SDL_SCANCODE_F && event.key.keysym.mod & MODIFIER) {
@ -1295,18 +1340,22 @@ void run_gui(bool is_running)
gui_state = SHOWING_DROP_MESSAGE;
}
current_selection = 0;
mouse_scroling = false;
scroll = 0;
current_menu = root_menu;
recalculate_menu_height();
should_render = true;
}
}
else if (gui_state == SHOWING_MENU) {
if (event.key.keysym.scancode == SDL_SCANCODE_DOWN && current_menu[current_selection + 1].string) {
current_selection++;
mouse_scroling = false;
should_render = true;
}
else if (event.key.keysym.scancode == SDL_SCANCODE_UP && current_selection) {
current_selection--;
mouse_scroling = false;
should_render = true;
}
else if (event.key.keysym.scancode == SDL_SCANCODE_RETURN && !current_menu[current_selection].backwards_handler) {
@ -1383,7 +1432,7 @@ void run_gui(bool is_running)
draw_text_centered(pixels, width, height, 8 + y_offset, "SameBoy", gui_palette_native[3], gui_palette_native[0], false);
unsigned i = 0, y = 24;
for (const struct menu_item *item = current_menu; item->string; item++, i++) {
if (i == current_selection) {
if (i == current_selection && !mouse_scroling) {
if (i == 0) {
if (y < scroll) {
scroll = (y - 4) / 12 * 12;
@ -1397,7 +1446,7 @@ void run_gui(bool is_running)
}
}
}
if (i == current_selection && i == 0 && scroll != 0) {
if (i == current_selection && i == 0 && scroll != 0 && !mouse_scroling) {
scroll = 0;
goto rerender;
}
@ -1433,6 +1482,22 @@ void run_gui(bool is_running)
}
}
if (scrollbar_size) {
unsigned scrollbar_offset = (140 - scrollbar_size) * scroll / (menu_height - 144);
if (scrollbar_offset + scrollbar_size > 140) {
scrollbar_offset = 140 - scrollbar_size;
}
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];
}
else {
pixel[0] = pixel[1]= gui_palette_native[1];
}
}
}
break;
case SHOWING_HELP:
draw_text(pixels, width, height, 2 + x_offset, 2 + y_offset, help[current_help_page], gui_palette_native[3], gui_palette_native[0]);