From 0c899bb62bbeb6cbe003aa904d55116703dcdec8 Mon Sep 17 00:00:00 2001
From: Andy Everitt <38423143+AndyEveritt@users.noreply.github.com>
Date: Tue, 24 Feb 2026 07:44:33 +0000
Subject: [PATCH] feat(dropdown): Support `LV_SIZE_CONTENT` and fix layout
 nested invalidation (#9307)

Co-authored-by: cubic-dev-ai[bot] <191113872+cubic-dev-ai[bot]@users.noreply.github.com>
---
 src/core/lv_obj.c                             |   4 +-
 src/core/lv_obj_pos.c                         |  35 ++++-
 src/core/lv_obj_pos.h                         |  16 +++
 src/widgets/dropdown/lv_dropdown.c            | 120 +++++++++++++++---
 src/widgets/label/lv_label.c                  |  11 +-
 .../widgets/dropdown_content_size_1.png       | Bin 0 -> 2011 bytes
 .../widgets/dropdown_content_size_1_open.png  | Bin 0 -> 2950 bytes
 .../widgets/dropdown_content_size_2.png       | Bin 0 -> 3231 bytes
 .../widgets/dropdown_content_size_3.png       | Bin 0 -> 3317 bytes
 ...j_pos_chained_layout_invalidation_post.png | Bin 0 -> 3296 bytes
 ...bj_pos_chained_layout_invalidation_pre.png | Bin 0 -> 2812 bytes
 .../widgets/dropdown_content_size_1.png       | Bin 0 -> 2021 bytes
 .../widgets/dropdown_content_size_1_open.png  | Bin 0 -> 3039 bytes
 .../widgets/dropdown_content_size_2.png       | Bin 0 -> 3329 bytes
 .../widgets/dropdown_content_size_3.png       | Bin 0 -> 3410 bytes
 ...j_pos_chained_layout_invalidation_post.png | Bin 0 -> 3766 bytes
 ...bj_pos_chained_layout_invalidation_pre.png | Bin 0 -> 3291 bytes
 tests/src/test_cases/widgets/test_dropdown.c  |  17 +++
 tests/src/test_cases/widgets/test_obj_pos.c   |  43 +++++--
 19 files changed, 213 insertions(+), 33 deletions(-)
 create mode 100644 tests/ref_imgs/widgets/dropdown_content_size_1.png
 create mode 100644 tests/ref_imgs/widgets/dropdown_content_size_1_open.png
 create mode 100644 tests/ref_imgs/widgets/dropdown_content_size_2.png
 create mode 100644 tests/ref_imgs/widgets/dropdown_content_size_3.png
 create mode 100644 tests/ref_imgs/widgets/obj_pos_chained_layout_invalidation_post.png
 create mode 100644 tests/ref_imgs/widgets/obj_pos_chained_layout_invalidation_pre.png
 create mode 100644 tests/ref_imgs_vg_lite/widgets/dropdown_content_size_1.png
 create mode 100644 tests/ref_imgs_vg_lite/widgets/dropdown_content_size_1_open.png
 create mode 100644 tests/ref_imgs_vg_lite/widgets/dropdown_content_size_2.png
 create mode 100644 tests/ref_imgs_vg_lite/widgets/dropdown_content_size_3.png
 create mode 100644 tests/ref_imgs_vg_lite/widgets/obj_pos_chained_layout_invalidation_post.png
 create mode 100644 tests/ref_imgs_vg_lite/widgets/obj_pos_chained_layout_invalidation_pre.png

diff --git a/src/core/lv_obj.c b/src/core/lv_obj.c
index 3ba67b92f3..115c7f6844 100644
--- a/src/core/lv_obj.c
+++ b/src/core/lv_obj.c
@@ -1035,11 +1035,9 @@ static void lv_obj_event(const lv_obj_class_t * class_p, lv_event_t * e)
         }
     }
     else if(code == LV_EVENT_CHILD_CHANGED) {
-        int32_t w = lv_obj_get_style_width(obj, LV_PART_MAIN);
-        int32_t h = lv_obj_get_style_height(obj, LV_PART_MAIN);
         int32_t align = lv_obj_get_style_align(obj, LV_PART_MAIN);
         uint16_t layout = lv_obj_get_style_layout(obj, LV_PART_MAIN);
-        if(layout || align || w == LV_SIZE_CONTENT || h == LV_SIZE_CONTENT) {
+        if(layout || align || lv_obj_is_style_any_width_content(obj) || lv_obj_is_style_any_height_content(obj)) {
             lv_obj_mark_layout_as_dirty(obj);
         }
     }
diff --git a/src/core/lv_obj_pos.c b/src/core/lv_obj_pos.c
index 177b0fb5ba..4f3847e45d 100644
--- a/src/core/lv_obj_pos.c
+++ b/src/core/lv_obj_pos.c
@@ -728,6 +728,26 @@ int32_t lv_obj_get_style_clamped_height(lv_obj_t * obj)
     return h;
 }
 
+bool lv_obj_is_style_any_width_content(lv_obj_t * obj)
+{
+    LV_ASSERT_OBJ(obj, MY_CLASS);
+
+    int32_t w = lv_obj_get_style_width(obj, LV_PART_MAIN);
+    int32_t minw = lv_obj_get_style_min_width(obj, LV_PART_MAIN);
+    int32_t maxw = lv_obj_get_style_max_width(obj, LV_PART_MAIN);
+    return (w == LV_SIZE_CONTENT || minw == LV_SIZE_CONTENT || maxw == LV_SIZE_CONTENT);
+}
+
+bool lv_obj_is_style_any_height_content(lv_obj_t * obj)
+{
+    LV_ASSERT_OBJ(obj, MY_CLASS);
+
+    int32_t h = lv_obj_get_style_height(obj, LV_PART_MAIN);
+    int32_t minh = lv_obj_get_style_min_height(obj, LV_PART_MAIN);
+    int32_t maxh = lv_obj_get_style_max_height(obj, LV_PART_MAIN);
+    return (h == LV_SIZE_CONTENT || minh == LV_SIZE_CONTENT || maxh == LV_SIZE_CONTENT);
+}
+
 bool lv_obj_is_width_min(lv_obj_t * obj)
 {
     LV_ASSERT_OBJ(obj, MY_CLASS);
@@ -766,10 +786,19 @@ bool lv_obj_is_height_max(lv_obj_t * obj)
 
 bool lv_obj_refresh_self_size(lv_obj_t * obj)
 {
-    int32_t w_set = lv_obj_get_style_width(obj, LV_PART_MAIN);
-    int32_t h_set = lv_obj_get_style_height(obj, LV_PART_MAIN);
-    if(w_set != LV_SIZE_CONTENT && h_set != LV_SIZE_CONTENT) return false;
+    if(!lv_obj_is_style_any_width_content(obj) && !lv_obj_is_style_any_height_content(obj))
+        return false;
 
+    /**
+     * Refresh the parent's layout, because the childs size is in some way dependent on its contents we need to force a
+     * recalculation of the parents layout
+     */
+    lv_obj_t * parent = lv_obj_get_parent(obj);
+    if(parent != NULL) {
+        parent->w_layout = 0;
+        parent->h_layout = 0;
+        lv_obj_mark_layout_as_dirty(parent);
+    }
     lv_obj_mark_layout_as_dirty(obj);
     return true;
 }
diff --git a/src/core/lv_obj_pos.h b/src/core/lv_obj_pos.h
index c3913e10c4..9b9f3fe92e 100644
--- a/src/core/lv_obj_pos.h
+++ b/src/core/lv_obj_pos.h
@@ -362,6 +362,22 @@ int32_t lv_obj_get_style_clamped_width(lv_obj_t * obj);
  */
 int32_t lv_obj_get_style_clamped_height(lv_obj_t * obj);
 
+/**
+ * Determine if any of the object's width style properties are set to `LV_SIZE_CONTENT`.
+ * @param obj Pointer to a valid object.
+ * @return `true`  At least one of the following width style properties is `LV_SIZE_CONTENT`: `LV_STYLE_WIDTH`, `LV_STYLE_MIN_WIDTH`, `LV_STYLE_MAX_WIDTH`.
+ * @return `false` No width style properties are `LV_SIZE_CONTENT`.
+ */
+bool lv_obj_is_style_any_width_content(lv_obj_t * obj);
+
+/**
+ * Determine if any of the object's height style properties are set to `LV_SIZE_CONTENT`.
+ * @param obj Pointer to a valid object.
+ * @return `true`  At least one of the following height style properties is `LV_SIZE_CONTENT`: `LV_STYLE_HEIGHT`, `LV_STYLE_MIN_HEIGHT`, `LV_STYLE_MAX_HEIGHT`.
+ * @return `false` No height style properties are `LV_SIZE_CONTENT`.
+ */
+bool lv_obj_is_style_any_height_content(lv_obj_t * obj);
+
 /**
  * @brief Determine if the object's resolved width was limited by its minimum width constraint.
  *
diff --git a/src/widgets/dropdown/lv_dropdown.c b/src/widgets/dropdown/lv_dropdown.c
index 2c7ddb09b5..d08e1f46d9 100644
--- a/src/widgets/dropdown/lv_dropdown.c
+++ b/src/widgets/dropdown/lv_dropdown.c
@@ -45,6 +45,7 @@ static void lv_dropdown_constructor(const lv_obj_class_t * class_p, lv_obj_t * o
 static void lv_dropdown_destructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
 static void lv_dropdown_event(const lv_obj_class_t * class_p, lv_event_t * e);
 static void draw_main(lv_event_t * e);
+static void refresh_size(lv_obj_t * obj);
 
 static void lv_dropdownlist_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
 static void lv_dropdownlist_destructor(const lv_obj_class_t * class_p, lv_obj_t * list_obj);
@@ -165,6 +166,9 @@ void lv_dropdown_set_text(lv_obj_t * obj, const char * text)
 {
     LV_ASSERT_OBJ(obj, MY_CLASS);
     lv_dropdown_t * dropdown = (lv_dropdown_t *)obj;
+    if(!dropdown->static_text && dropdown->text && text && lv_strcmp(dropdown->text, text) == 0) {
+        return;
+    }
 
     char * copied_text = NULL;
     if(text) {
@@ -184,11 +188,16 @@ void lv_dropdown_set_text_static(lv_obj_t * obj, const char * text)
     LV_ASSERT_OBJ(obj, MY_CLASS);
     lv_dropdown_t * dropdown = (lv_dropdown_t *)obj;
 
-    if(!dropdown->static_text) lv_free(dropdown->text);
+    if(dropdown->static_text && dropdown->text && text && lv_strcmp(dropdown->text, text) == 0) {
+        return;
+    }
+
+    if(!dropdown->static_text)
+        lv_free(dropdown->text);
     dropdown->static_text = 1;
     dropdown->text = (char *)text;
 
-    lv_obj_invalidate(obj);
+    refresh_size(obj);
 }
 
 void lv_dropdown_set_options(lv_obj_t * obj, const char * options)
@@ -234,8 +243,9 @@ void lv_dropdown_set_options(lv_obj_t * obj, const char * options)
     /*Now the text is dynamically allocated*/
     dropdown->static_options = 0;
 
-    lv_obj_invalidate(obj);
-    if(dropdown->list) lv_obj_invalidate(dropdown->list);
+    refresh_size(obj);
+    if(dropdown->list)
+        lv_obj_invalidate(dropdown->list);
 }
 
 void lv_dropdown_set_options_static(lv_obj_t * obj, const char * options)
@@ -263,8 +273,9 @@ void lv_dropdown_set_options_static(lv_obj_t * obj, const char * options)
     dropdown->static_options = 1;
     dropdown->options = (char *)options;
 
-    lv_obj_invalidate(obj);
-    if(dropdown->list) lv_obj_invalidate(dropdown->list);
+    refresh_size(obj);
+    if(dropdown->list)
+        lv_obj_invalidate(dropdown->list);
 }
 
 void lv_dropdown_add_option(lv_obj_t * obj, const char * option, uint32_t pos)
@@ -335,8 +346,9 @@ void lv_dropdown_add_option(lv_obj_t * obj, const char * option, uint32_t pos)
 
     dropdown->option_cnt++;
 
-    lv_obj_invalidate(obj);
-    if(dropdown->list) lv_obj_invalidate(dropdown->list);
+    refresh_size(obj);
+    if(dropdown->list)
+        lv_obj_invalidate(dropdown->list);
 }
 
 void lv_dropdown_clear_options(lv_obj_t * obj)
@@ -352,8 +364,9 @@ void lv_dropdown_clear_options(lv_obj_t * obj)
     dropdown->static_options = 1;
     dropdown->option_cnt = 0;
 
-    lv_obj_invalidate(obj);
-    if(dropdown->list) lv_obj_invalidate(dropdown->list);
+    refresh_size(obj);
+    if(dropdown->list)
+        lv_obj_invalidate(dropdown->list);
 }
 
 void lv_dropdown_set_selected(lv_obj_t * obj, uint32_t sel_opt)
@@ -370,7 +383,7 @@ void lv_dropdown_set_selected(lv_obj_t * obj, uint32_t sel_opt)
         position_to_selected(obj, LV_ANIM_OFF);
     }
 
-    lv_obj_invalidate(obj);
+    refresh_size(obj);
 }
 
 void lv_dropdown_set_dir(lv_obj_t * obj, lv_dir_t dir)
@@ -391,7 +404,7 @@ void lv_dropdown_set_symbol(lv_obj_t * obj, const void * symbol)
 
     lv_dropdown_t * dropdown = (lv_dropdown_t *)obj;
     dropdown->symbol = symbol;
-    lv_obj_invalidate(obj);
+    refresh_size(obj);
 }
 
 void lv_dropdown_set_selected_highlight(lv_obj_t * obj, bool en)
@@ -795,7 +808,11 @@ static void lv_dropdown_event(const lv_obj_class_t * class_p, lv_event_t * e)
     }
     else if(code == LV_EVENT_RELEASED) {
         res = btn_release_handler(obj);
-        if(res != LV_RESULT_OK) return;
+        if(res != LV_RESULT_OK)
+            return;
+    }
+    else if(code == LV_EVENT_VALUE_CHANGED) {
+        refresh_size(obj);
     }
     else if(code == LV_EVENT_STYLE_CHANGED) {
         lv_obj_refresh_self_size(obj);
@@ -804,9 +821,73 @@ static void lv_dropdown_event(const lv_obj_class_t * class_p, lv_event_t * e)
         lv_obj_refresh_self_size(obj);
     }
     else if(code == LV_EVENT_GET_SELF_SIZE) {
-        lv_point_t * p = lv_event_get_param(e);
         const lv_font_t * font = lv_obj_get_style_text_font(obj, LV_PART_MAIN);
-        p->y = lv_font_get_line_height(font);
+
+        lv_point_t size;
+        size.x = 0;
+        size.y = 0;
+
+        /* Calculate the symbol width */
+        int32_t symbol_w = 0;
+        if(dropdown->symbol) {
+            lv_draw_label_dsc_t symbol_dsc;
+            lv_draw_label_dsc_init(&symbol_dsc);
+
+            lv_image_src_t symbol_type = lv_image_src_get_type(dropdown->symbol);
+            if(symbol_type == LV_IMAGE_SRC_SYMBOL) {
+                lv_point_t text_size;
+
+                lv_text_get_size(&text_size,
+                                 dropdown->symbol,
+                                 symbol_dsc.font,
+                                 symbol_dsc.letter_space,
+                                 symbol_dsc.line_space,
+                                 LV_COORD_MAX,
+                                 symbol_dsc.flag);
+                symbol_w = text_size.x;
+            }
+            else {
+                lv_image_header_t header;
+                lv_result_t decoder_res = lv_image_decoder_get_info(dropdown->symbol, &header);
+                if(decoder_res == LV_RESULT_OK) {
+                    symbol_w = header.w;
+                }
+                else {
+                    symbol_w = 0;
+                }
+            }
+            size.x += symbol_w;
+            size.x += lv_obj_get_style_pad_column(obj, LV_PART_MAIN);
+        }
+
+        /* Calculate the text width */
+        const char * opt_txt;
+        char buf[128];
+        if(dropdown->text)
+            opt_txt = dropdown->text;
+        else {
+            lv_dropdown_get_selected_str(obj, buf, 128);
+            opt_txt = buf;
+        }
+
+        if(opt_txt == NULL) {
+            size.y = LV_MAX(size.y, lv_font_get_line_height(font));
+        }
+        else {
+            lv_draw_label_dsc_t dsc;
+            lv_draw_label_dsc_init(&dsc);
+
+            lv_point_t text_size;
+            int32_t max_width = lv_obj_calc_dynamic_width(obj, LV_STYLE_MAX_WIDTH) - size.x;
+            lv_text_get_size(&text_size, opt_txt, font, dsc.letter_space, dsc.line_space, max_width, dsc.flag);
+
+            size.x += text_size.x;
+            size.y = LV_MAX(size.y, text_size.y);
+        }
+
+        lv_point_t * p = lv_event_get_param(e);
+        p->x = LV_MAX(p->x, size.x);
+        p->y = LV_MAX(p->y, size.y);
     }
     else if(code == LV_EVENT_KEY) {
         uint32_t c = lv_event_get_key(e);
@@ -839,7 +920,8 @@ static void lv_dropdown_event(const lv_obj_class_t * class_p, lv_event_t * e)
             lv_obj_t * indev_obj = lv_indev_get_active_obj();
             if(indev_obj != obj) {
                 res = btn_release_handler(obj);
-                if(res != LV_RESULT_OK) return;
+                if(res != LV_RESULT_OK)
+                    return;
             }
         }
     }
@@ -1032,6 +1114,12 @@ static void draw_main(lv_event_t * e)
     lv_draw_label(layer, &label_dsc, &txt_area);
 }
 
+static void refresh_size(lv_obj_t * obj)
+{
+    lv_obj_invalidate(obj);
+    lv_obj_refresh_self_size(obj);
+}
+
 static void draw_list(lv_event_t * e)
 {
     lv_obj_t * list_obj = lv_event_get_current_target(e);
diff --git a/src/widgets/label/lv_label.c b/src/widgets/label/lv_label.c
index d550043c5e..0a25fc86ad 100644
--- a/src/widgets/label/lv_label.c
+++ b/src/widgets/label/lv_label.c
@@ -1063,7 +1063,16 @@ static void lv_label_mark_need_refr_text(lv_obj_t * obj)
     label->invalid_size_cache = true;
 
     lv_obj_invalidate(obj);
-    lv_obj_refresh_self_size(obj);
+
+    /**
+     * Ideally we would use `lv_obj_refresh_self_size(obj);` here but it can cause an infinite loop due to the way label
+     * self size is implemented.
+     * The implementation should be revisited in the future since it currently doesn't handle fixed height, content
+     * width in all scenarios properly.
+     * Once that is fixed we should be able to use `lv_obj_refresh_self_size(obj);` here.
+     */
+    if(lv_obj_is_style_any_height_content(obj) || lv_obj_is_style_any_width_content(obj))
+        lv_obj_mark_layout_as_dirty(obj);
 
     if(!label->need_refr_text) {
         label->need_refr_text = true;
diff --git a/tests/ref_imgs/widgets/dropdown_content_size_1.png b/tests/ref_imgs/widgets/dropdown_content_size_1.png
new file mode 100644
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diff --git a/tests/ref_imgs/widgets/dropdown_content_size_1_open.png b/tests/ref_imgs/widgets/dropdown_content_size_1_open.png
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diff --git a/tests/src/test_cases/widgets/test_dropdown.c b/tests/src/test_cases/widgets/test_dropdown.c
index 8c3d64469d..465f60cfe8 100644
--- a/tests/src/test_cases/widgets/test_dropdown.c
+++ b/tests/src/test_cases/widgets/test_dropdown.c
@@ -540,5 +540,22 @@ void test_dropdown_properties(void)
 #endif
 }
 
+void test_dropdown_content_size()
+{
+    lv_obj_t * dd = lv_dropdown_create(lv_screen_active());
+    lv_dropdown_set_options(dd, "Short\nA bit longer option\nThe longest option in the list");
+    lv_obj_set_width(dd, LV_SIZE_CONTENT);
+    TEST_ASSERT_EQUAL_SCREENSHOT("widgets/dropdown_content_size_1.png");
 
+    lv_dropdown_open(dd);
+    TEST_ASSERT_EQUAL_SCREENSHOT("widgets/dropdown_content_size_1_open.png");
+
+    lv_dropdown_set_selected(dd, 1);
+    lv_obj_refresh_self_size(lv_screen_active());
+    lv_obj_invalidate(lv_screen_active());
+    TEST_ASSERT_EQUAL_SCREENSHOT("widgets/dropdown_content_size_2.png");
+
+    lv_dropdown_set_selected(dd, 2);
+    TEST_ASSERT_EQUAL_SCREENSHOT("widgets/dropdown_content_size_3.png");
+}
 #endif
diff --git a/tests/src/test_cases/widgets/test_obj_pos.c b/tests/src/test_cases/widgets/test_obj_pos.c
index 75dd3ef6ff..3d0869d4a6 100644
--- a/tests/src/test_cases/widgets/test_obj_pos.c
+++ b/tests/src/test_cases/widgets/test_obj_pos.c
@@ -81,17 +81,40 @@ void test_style_min_size(void)
     lv_obj_set_style_min_width(child, LV_SIZE_CONTENT, 0);
     lv_obj_set_style_min_height(child, LV_SIZE_CONTENT, 0);
     TEST_ASSERT_EQUAL_SCREENSHOT("widgets/obj_pos_content_min_size.png");
-    TEST_ASSERT_TRUE(lv_obj_is_width_min(child));
-    TEST_ASSERT_TRUE(lv_obj_is_height_min(child));
+}
 
-    lv_obj_set_size(parent, 100, 100);
-    lv_obj_set_style_min_width(child, 0, 0);
-    lv_obj_set_style_min_height(child, 0, 0);
-    lv_refr_now(NULL);
-    TEST_ASSERT_FALSE(lv_obj_is_width_min(child));
-    TEST_ASSERT_FALSE(lv_obj_is_height_min(child));
-    TEST_ASSERT_EQUAL(LV_PCT(100), lv_obj_get_style_clamped_width(child));
-    TEST_ASSERT_EQUAL(LV_PCT(100), lv_obj_get_style_clamped_height(child));
+void test_chaining_invalidation_layout(void)
+{
+    lv_obj_t * cont = lv_obj_create(lv_screen_active());
+    lv_obj_set_name(cont, "cont");
+    lv_obj_set_size(cont, 500, LV_SIZE_CONTENT);
+    lv_obj_set_style_bg_color(cont, lv_palette_main(LV_PALETTE_RED), 0);
+    lv_obj_set_style_bg_opa(cont, LV_OPA_COVER, 0);
+    lv_obj_set_flex_flow(cont, LV_FLEX_FLOW_ROW_WRAP);
+
+    lv_obj_t * label = lv_label_create(cont);
+    lv_obj_set_name(label, "label");
+    lv_label_set_text(label, "Dropdown with size content:");
+
+    lv_obj_t * sub_cont = lv_obj_create(cont);
+    lv_obj_set_name(sub_cont, "sub_cont");
+    lv_obj_set_style_bg_color(sub_cont, lv_palette_main(LV_PALETTE_GREEN), 0);
+    lv_obj_set_style_bg_opa(sub_cont, LV_OPA_COVER, 0);
+    lv_obj_set_height(sub_cont, LV_SIZE_CONTENT);
+    lv_obj_set_flex_flow(sub_cont, LV_FLEX_FLOW_ROW);
+    lv_obj_set_flex_grow(sub_cont, 1);
+    lv_obj_set_style_min_width(sub_cont, LV_SIZE_CONTENT, LV_PART_MAIN);
+
+    lv_obj_t * dd = lv_dropdown_create(sub_cont);
+    lv_obj_set_name(dd, "dropdown");
+    lv_dropdown_set_options(dd, "Short\nA bit longer option\nThe longest option in the list");
+    lv_obj_set_width(dd, 0);
+    lv_obj_set_style_min_width(dd, LV_SIZE_CONTENT, 0);
+    lv_obj_set_flex_grow(dd, 1);
+
+    TEST_ASSERT_EQUAL_SCREENSHOT("widgets/obj_pos_chained_layout_invalidation_pre.png");
+    lv_dropdown_set_selected(dd, 2);
+    TEST_ASSERT_EQUAL_SCREENSHOT("widgets/obj_pos_chained_layout_invalidation_post.png");
 }
 
 void test_circular_height_dependency(void)