为atp_select添加了默认选中项目的功能，先build一下试试

include/arm11/acf.h

@@ -41,6 +41,15 @@ extern acf_error_t acf_initialize(
     INPUT(acf_text_t)       filename_of_acf_font
 );
 
+extern acf_error_t acf_calculate(
+    INPUT(acf_rectedge_t)   width_in_pixel_of_canvas,
+    INPUT(acf_text_t)       text_painting_in_utf8,
+
+    OUTPUT(acf_rectedge_t)  using_width_in_pixel_of_canvas, 
+    OUTPUT(acf_counter_t)   rendered_char_counting, 
+    OUTPUT(acf_text_t)      text_not_rendered_in_utf8
+);
+
 extern acf_canvas_t acf_get_canvas(
     INPUT(acf_rectedge_t)   width_in_pixel_of_canvas, 
     INPUT(acf_text_t)       text_painting_in_utf8, 

include/arm11/atp.h

@@ -60,12 +60,14 @@ typedef struct {
 typedef atp_error_t (*atp_lineprovider_t)(
     INPUT(atp_callerdata_t)     some_data_provided_by_caller,
     INPUT(atp_counter_t)        line_index_of_this_page,
+    
     OUTPUT(atp_linecfg_t)       configuration_of_this_line
 );
 
 typedef atp_error_t (*atp_itemprovider_t)(
     INPUT(atp_callerdata_t)     some_data_provided_by_caller,
     INPUT(atp_counter_t)        index_of_current_option_item,
+
     OUTPUT(atp_itemcfg_t)       configuration_of_current_option_item
 );
 
@@ -91,6 +93,8 @@ extern atp_error_t atp_select(
     INPUT(atp_itemprovider_t)   item_information_provider,
     INPUT(atp_keyhandler_t)     extra_key_handler,
     INPUT(atp_callerdata_t)     some_data_from_caller,
+    INPUT(atp_counter_t)        index_of_default_selected_item,
+
     OUTPUT(atp_itemval_t)       value_of_select_item
 );
 

source/arm11/acf.c

@@ -279,7 +279,7 @@ static int render_unicode(FHandle fd, int *x, unsigned width, unsigned height, u
 
     // render
     // 从上往下(y从大到小，x从小到大)进行绘制
-    int px = *x, py = -1-gblfont.offsety;                            // px/py不参与计算位置
+    int px = *x, py = -1-gblfont.offsety;            // px/py不参与计算位置
     int cx = px + bbx[2], cy = py + bbx[1] + bbx[3]; // cx/cy计算位置进行绘制
 
     // 先检查宽度
@@ -287,17 +287,20 @@ static int render_unicode(FHandle fd, int *x, unsigned width, unsigned height, u
         return 1;
 
     // 绘制
-    for (int i = 0; i < bbx[1]; ++i)
+    if ( ram != NULL ) 
     {
-        for (int j = 0; j < bbx[0]; ++j)
+        for (int i = 0; i < bbx[1]; ++i)
         {
-            int tx = cx+j, ty = cy-i;
+            for (int j = 0; j < bbx[0]; ++j)
-            // see: https://www.zhihu.com/question/264505093/answer/281849883
-            if( ( tx | ((int)width-tx) | ty | ((int)height-ty) ) > 0 ) // 0 <= tx && tx < width && 0 <= ty && ty <= height
             {
-                if( BIT_AT_POS(glyph, bbx[0] * i + j) )
+                int tx = cx+j, ty = cy-i;
+                // see: https://www.zhihu.com/question/264505093/answer/281849883
+                if( ( tx | ((int)width-tx) | ty | ((int)height-ty) ) > 0 ) // 0 <= tx && tx < width && 0 <= ty && ty <= height
                 {
-                    SET_AT_POS( ram, PIX_IN_LINE(tx, ty, width) );
+                    if( BIT_AT_POS(glyph, bbx[0] * i + j) )
+                    {
+                        SET_AT_POS( ram, PIX_IN_LINE(tx, ty, width) );
+                    }
                 }
             }
         }
@@ -387,3 +390,43 @@ acf_canvas_t acf_get_canvas(acf_rectedge_t width, acf_text_t text, acf_rectedge_
     fClose(font);
     return canvas;
 }
+
+acf_canvas_t acf_calculate(acf_rectedge_t width, acf_text_t text, acf_rectedge_t *realwidth, acf_counter_t *renderedcnt, acf_text_t *rest)
+{
+    FHandle font;
+    if( gblfont.filename == NULL || RES_OK != fOpen(&font, gblfont.filename, FA_OPEN_EXISTING | FA_READ) )
+    {
+        // log
+        return ACFONT_NOT_FOUND;
+    }
+
+    uint32_t unicode;
+    int linex = 0;
+    int rendered_count = 0;
+    const char *utf8_line = text;
+
+    for (const char *next = next_unicode(utf8_line, &unicode);
+         next != NULL;
+         next = next_unicode(utf8_line, &unicode))
+    {
+        int error = render_unicode(font, &linex, width, gblfont.height, unicode, NULL);
+        if( error > 0 ) break;
+        else if( error < 0 ) error = render_unicode(font, &linex, width, gblfont.height, '?', NULL);
+
+        if( error )
+        {
+            fClose(font);
+            return error;
+        }
+
+        utf8_line = next;
+        ++rendered_count;
+    }
+
+    if( realwidth != NULL ) *realwidth = linex;
+    if( renderedcnt != NULL ) *renderedcnt = rendered_count;
+    if( rest != NULL ) *rest = utf8_line;
+    
+    fClose(font);
+    return 0;
+}

source/arm11/atp.c

@@ -223,11 +223,11 @@ static void draw_options( int start_row, int start_idx, int option_cnt, int sele
                         else draw_options( 0, idx_top - title_len, cnt, item_sel, provider, data ); \
                      }
 
-atp_error_t atp_select( atp_text_t title, atp_counter_t cnt, atp_itemprovider_t provider, atp_keyhandler_t handler, atp_callerdata_t data, atp_itemval_t *res )
+atp_error_t atp_select( atp_text_t title, atp_counter_t cnt, atp_itemprovider_t provider, atp_keyhandler_t handler, atp_callerdata_t data, atp_counter_t index, atp_itemval_t *res )
 {
     uint8_t title_offset[TITLE_MAX];
-    int idx_top = 0, title_len = 1;
+    int item_sel = index < cnt ? index : 0;
-    int item_sel = 0;
+    int title_len = 1;
     atp_itemcfg_t config;
 
     screen_clean();
@@ -236,17 +236,22 @@ atp_error_t atp_select( atp_text_t title, atp_counter_t cnt, atp_itemprovider_t
     const char *cursor = title;
     for( int i=0; i < TITLE_MAX; ++i )
     {
-        const char *next = easy_put( cursor, ATP_PLACEMENT_LEFT, ATP_COLOR_LIGHT, i );
+        const char *next;
-        if( *next == '\0' ) break;
+        if( 0 == acf_calculate( CONTAINER_RECT_WIDTH, cursor, NULL, NULL, &next ) )
+        {
+            if( *next == '\0' ) break;
 
-        title_offset[i] = next - cursor;
+            title_offset[i] = next - cursor;
-        ++title_len;
+            ++title_len;
-        cursor = next;
+            cursor = next;
+        }
     }
     for( int i=title_len; i < TITLE_MAX; ++i ) title_offset[i] = 0;
 
     // draw item
-    draw_options( title_len, 0, cnt, item_sel, provider, data );
+    int idx_top = item_sel + title_len;
+    idx_top = idx_top - idx_top%CONTAINER_MAX_LINES;
+    REFRESH_PAGE;
 
     while( 1 )
     {
@@ -338,7 +343,9 @@ atp_error_t atp_select( atp_text_t title, atp_counter_t cnt, atp_itemprovider_t
 
             // 更新item_sel
             item_sel = idx_top + item_sel % CONTAINER_MAX_LINES;
-            if( item_sel >= (int)cnt ) item_sel = cnt-1;
+            if( idx_top == 0 && item_sel >= CONTAINER_MAX_LINES-title_len )
+                item_sel = 0;
+            else if( item_sel >= (int)cnt ) item_sel = cnt-1;
 
             // 更新view
             REFRESH_PAGE;

source/arm11/filebrowser.c

@@ -76,7 +76,7 @@ int dlistCompare(const void *a, const void *b)
 	return res;
 }
 
-static Result scanDir(const char *const path, DirList *const dList, const char *const filter)
+static Result scanDir(const char *const path, DirList *const dList, const char *const filter, const char *match, int *index)
 {
 	FILINFO *const fis = (FILINFO*)malloc(sizeof(FILINFO) * DIR_READ_BLOCKS);
 	if(fis == NULL) return RES_OUT_OF_MEM;
@@ -127,6 +127,18 @@ scanEnd:
 
 	qsort(dList->ptrs, dList->num, sizeof(char*), dlistCompare);
 
+	if( match != NULL )
+	{
+		for( int i=0; i < dList->num; ++i )
+		{
+			if( strcmp(match, &dList->ptrs[i][1]) == 0 )
+			{
+				*index = i;
+				break;
+			}
+		}
+	}
+
 	return res;
 }
 
@@ -156,6 +168,7 @@ atp_error_t display_empty( atp_callerdata_t, atp_counter_t, atp_linecfg_t *confi
 					if(*(tmpPathPtr - 1) == ':') tmpPathPtr++; \
 					*tmpPathPtr = '\0'; \
 					scan = 1; \
+					upFrom = tmpPathPtr + 1; \
 				}
 Result browseFiles(const char *const basePath, char selected[512])
 {
@@ -170,15 +183,18 @@ Result browseFiles(const char *const basePath, char selected[512])
 	if(dList == NULL) return RES_OUT_OF_MEM;
 
 	Result res;
-	if((res = scanDir(curDir, dList, ".gba")) != RES_OK) goto end;
+	if((res = scanDir(curDir, dList, ".gba", NULL, NULL)) != RES_OK) goto end;
 	
-	while( 1 ){
+	const char *upFrom = NULL;
+	int selecting = 0;
+	while( 1 )
+	{
 		atp_itemval_t value;
 		atp_boolean_t scan = 0;
 		atp_error_t error;
 		const u32 count = dList->num;
 		if( count > 0 )
-			error = atp_select( curDir, count, display_folder, NULL, (atp_callerdata_t)dList, &value );
+			error = atp_select( curDir, count, display_folder, NULL, (atp_callerdata_t)dList, selecting, &value );
 		else error = atp_show( 1, display_empty, NULL );
 
 		u32 pathLen = strlen(curDir);
@@ -210,7 +226,12 @@ Result browseFiles(const char *const basePath, char selected[512])
 					safeStrcpy( selected, curDir, 512 );
 					break;
 				}
-				else scan = 1;
+				else 
+				{
+					scan = 1;
+					selecting = 0;
+					upFrom = NULL;
+				}
 			}
 		}
 		else if( error == ATP_NO_ACTION )
@@ -220,7 +241,7 @@ Result browseFiles(const char *const basePath, char selected[512])
 
 		if( scan )
 		{
-			if(RES_OK != (res = scanDir(curDir, dList, ".gba")) )
+			if(RES_OK != (res = scanDir(curDir, dList, ".gba", upFrom, &selecting)) )
 				break;
 		}
 	}