jfileselect: add a scrollbar option (enabled by default)

include/justui/jfileselect.h

@@ -39,6 +39,8 @@ typedef struct {
     bool saveas;
     /* Whether we are currently using the input field */
     bool input_mode;
+    /* Scrollbar with (0 to disable) */
+    int8_t scrollbar_width;
     /* File filter; NULL accepts everything */
     bool (*filter_function)(struct dirent const *entry);
 
@@ -113,6 +115,7 @@ bool jfileselect_default_filter(struct dirent const *entry);
 /* Trivial properties */
 void jfileselect_set_font(jfileselect *fs, font_t const *font);
 void jfileselect_set_line_spacing(jfileselect *fs, int line_spacing);
+void jfileselect_set_scrollbar_width(jfileselect *fs, int scrollbar_width);
 void jfileselect_set_show_file_size(jfileselect *fs, bool show_file_size);
 
 #endif /* _J_JFILESELECT */

src/jfileselect.c

@@ -63,7 +63,14 @@ jfileselect *jfileselect_create(void *parent)
 	fs->scroll = 0;
 	fs->visible_lines = 0;
 
+#ifdef FX9860G
+	fs->line_spacing = 1;
+	fs->scrollbar_width = 1;
+#else
 	fs->line_spacing = 4;
+	fs->scrollbar_width = 2;
+#endif
+
 	fs->font = dfont_default();
 	fs->show_file_size = false;
 
@@ -129,6 +136,11 @@ void jfileselect_set_line_spacing(jfileselect *fs, int line_spacing)
 	count_visible_lines(fs);
 }
 
+void jfileselect_set_scrollbar_width(jfileselect *fs, int scrollbar_width)
+{
+	fs->scrollbar_width = scrollbar_width;
+}
+
 void jfileselect_set_show_file_size(jfileselect *fs, bool show_file_size)
 {
 	fs->show_file_size = show_file_size;
@@ -337,7 +349,7 @@ static void jfileselect_poly_csize(void *fs0)
 	jwidget *w = &fs->widget;
 
 	w->w = 128;
-	w->h = 6 * max(fs->font->line_height + fs->line_spacing, 0);
+	w->h = 3 * max(fs->font->line_height + fs->line_spacing, 0);
 }
 
 static void jfileselect_poly_layout(void *fs0)
@@ -347,6 +359,23 @@ static void jfileselect_poly_layout(void *fs0)
 	fs->saveas_input->widget.w = jwidget_content_width(fs) - 4;
 }
 
+static void generate_info_string(char *str, bool isfolder, int size)
+{
+#ifdef FX9860G
+	if(isfolder)
+		sprintf(str, "%d/", size);
+	else if(size < 10000) /* 10 kB */
+		sprintf(str, "%d", size);
+	else
+		sprintf(str, "%dk", size / 1000);
+#else
+	if(isfolder)
+		sprintf(str, "%d entries", size);
+	else
+		sprintf(str, "%d B", size);
+#endif
+}
+
 static void jfileselect_poly_render(void *fs0, int x, int y)
 {
 	jfileselect *fs = fs0;
@@ -355,9 +384,15 @@ static void jfileselect_poly_render(void *fs0, int x, int y)
 
 	font_t const *old_font = dfont(fs->font);
 	int line_height = fs->font->line_height + fs->line_spacing;
-	int cw = jwidget_content_width(fs);
+	int cw = jwidget_content_width(fs) - 2 * fs->scrollbar_width;
+	int ch = jwidget_content_height(fs);
 	struct fileinfo *finfo = fs->entries;
 
+	bool scrollbar =
+		fs->entry_count > fs->visible_lines
+		&& fs->scrollbar_width > 0;
+	int entry_width = cw - (scrollbar ? 2 * fs->scrollbar_width : 0);
+
 	for(int i = 0; i < fs->visible_lines && i < fs->entry_count; i++) {
 		bool selected = (fs->cursor == fs->scroll + i);
 		struct fileinfo *info = &finfo[fs->scroll + i];
@@ -376,16 +411,29 @@ static void jfileselect_poly_render(void *fs0, int x, int y)
 			continue;
 		}
 
-		if(selected)
-			drect(x, line_y, x + cw - 1, line_y + line_height - 1, C_BLACK);
+		if(selected) {
+			drect(x, line_y, x + entry_width - 1, line_y + line_height - 1,
+				C_BLACK);
+		}
 
 		dprint(x+2, text_y, fg, "%s%s", info->name, isfolder ? "/" : "");
 		if(fs->show_file_size && info->size >= 0) {
-			dprint_opt(x + cw - 3, text_y, fg, C_NONE, DTEXT_RIGHT, DTEXT_TOP,
-				isfolder ? "%d entries" : "%d B", info->size);
+			char str[32];
+			generate_info_string(str, isfolder, info->size);
+			dtext_opt(x + entry_width - 3, text_y, fg, C_NONE, DTEXT_RIGHT,
+				DTEXT_TOP, str);
 		}
 	}
 
+	if(scrollbar) {
+		int sb_y = ch * fs->scroll / fs->entry_count;
+		int sb_h = ch * fs->visible_lines / fs->entry_count;
+
+		drect(x + cw - fs->scrollbar_width, y + sb_y,
+		      x + cw - 1, y + sb_y + sb_h - 1,
+		      C_BLACK);
+	}
+
 	dfont(old_font);
 }