Add ability for FixedDimensionPanel to operate in one of three modes; display dimension, child dimension, or fixed.

- Display dimensions use the width/height of the display (minus margin, border, and padding) for the dimension
- Child dimensions fix the dimension to that of the child
- Fixed dimension uses a specified pixel value (or lambda returning pixel value)

esphome/components/graphical_layout/fixed_dimension_panel.cpp

@@ -11,28 +11,53 @@ static const char *const TAG = "fixeddimensionpanel";
 
 void FixedDimensionPanel::dump_config(int indent_depth, int additional_level_depth) {
   this->dump_config_base_properties(TAG, indent_depth);
-                YESNO(this->width_.value() < 1));
-  ESP_LOGCONFIG(TAG, "%*sHeight: %i (Will use display height: %s)", indent_depth, "", this->height_.value(),
-                YESNO(this->height_.value() < 1));
+  if (this->width_.value() < 0) {
+    ESP_LOGCONFIG(TAG, "%*sWidth: UNSET (Will use %s's width)", indent_depth, "", 
+                  this->unset_width_uses_display_width_ ? "DISPLAY" : "CHILD");
+  } else {
+    ESP_LOGCONFIG(TAG, "%*sWidth: %i", indent_depth, "", this->width_.value());
+  }
+
+if (this->height_.value() < 0) {
+    ESP_LOGCONFIG(TAG, "%*sHeight: UNSET (Will use %s's height)", indent_depth, "", 
+                  this->unset_height_uses_display_height_ ? "DISPLAY" : "CHILD");
+  } else {
+    ESP_LOGCONFIG(TAG, "%*sHeight: %i", indent_depth, "", this->height_.value());
+  }
+
   this->child_->dump_config(indent_depth + additional_level_depth, additional_level_depth);
 }
 
 display::Rect FixedDimensionPanel::measure_item_internal(display::Display *display) {
+  // Call measure_child so they can do any measurements
+  display::Rect child_size = this->child_->measure_item(display);
   display::Rect rect(0, 0, this->width_.value(), this->height_.value());
-  if (rect.w < 1) {
-    rect.w = display->get_width();
+
+  if (rect.w < 0) {
+    if (this->unset_width_uses_display_width_) {
+      rect.w = display->get_width();
+      // We need to account for our own padding + margin + border
+      rect.w -= (this->margin_ + this->border_ + this->padding_) * 2;
+    } else {
+      rect.w = child_size.w;
+    }
   }
-  if (rect.h < 1) {
-    rect.h = display->get_height();
+
+  if (rect.h < 0) {
+    if (this->unset_height_uses_display_height_) {
+      rect.h = display->get_height();
+      // We need to account for our own padding + margin + border
+      rect.h -= (this->margin_ + this->border_ + this->padding_) * 2;
+    } else {
+      rect.h = child_size.h;
+    }
   }
-  // Call measure_child just so they can do any measurements
-  this->child_->measure_item(display);
 
   return rect;
 }
 
 void FixedDimensionPanel::render_internal(display::Display *display, display::Rect bounds) {
-  this->child_->render_internal(display, bounds);
+  this->child_->render(display, bounds);
 }
 
 }  // namespace graphical_layout

esphome/components/graphical_layout/fixed_dimension_panel.h

@@ -19,10 +19,19 @@ class FixedDimensionPanel : public LayoutItem {
   template<typename V> void set_width(V width) { this->width_ = width; };
   template<typename V> void set_height(V height) { this->height_ = height; }
 
+  void set_unset_width_uses_display_width(bool use_display) { 
+    this->unset_width_uses_display_width_ = use_display; 
+  }
+  void set_unset_height_uses_display_height(bool use_display) {
+    this->unset_height_uses_display_height_ = use_display;
+  }
+
  protected:
   LayoutItem *child_{nullptr};
-  TemplatableValue<int> width_{0};
-  TemplatableValue<int> height_{0};
+  TemplatableValue<int> width_{-1};
+  TemplatableValue<int> height_{-1};
+  bool unset_width_uses_display_width_{false};
+  bool unset_height_uses_display_height_{false};
 };
 
 }  // namespace graphical_layout

esphome/components/graphical_layout/fixed_dimension_panel.py

@@ -5,19 +5,25 @@ from esphome.const import CONF_TYPE, CONF_WIDTH, CONF_HEIGHT
 graphical_layout_ns = cg.esphome_ns.namespace("graphical_layout")
 FixedDimensionPanel = graphical_layout_ns.class_("FixedDimensionPanel")
 
-CONF_ITEM_PADDING = "item_padding"
 CONF_FIXED_DIMENSION_PANEL = "fixed_dimension_panel"
 CONF_CHILD = "child"
 
+UNSET_DIMENSION_MODE = ["CHILD", "DISPLAY"]
+
 
 def get_config_schema(base_item_schema, item_type_schema):
     return base_item_schema.extend(
         {
             cv.GenerateID(): cv.declare_id(FixedDimensionPanel),
-            cv.Optional(CONF_ITEM_PADDING, default=0): cv.int_,
             cv.Required(CONF_CHILD): item_type_schema,
-            cv.Optional(CONF_WIDTH, default=-1): cv.templatable(cv.int_range(min=-1)),
-            cv.Optional(CONF_HEIGHT, default=-1): cv.templatable(cv.int_range(min=-1)),
+            cv.Optional(CONF_WIDTH, default=-1): cv.Any(
+                cv.one_of(*UNSET_DIMENSION_MODE, upper=True),
+                cv.templatable(cv.int_range(min=-1)),
+            ),
+            cv.Optional(CONF_HEIGHT, default=-1): cv.Any(
+                cv.one_of(*UNSET_DIMENSION_MODE, upper=True),
+                cv.templatable(cv.int_range(min=-1)),
+            ),
         }
     )
 
@@ -25,13 +31,29 @@ def get_config_schema(base_item_schema, item_type_schema):
 async def config_to_layout_item(pvariable_builder, item_config, child_item_builder):
     var = await pvariable_builder(item_config)
 
-    width = await cg.templatable(item_config[CONF_WIDTH], args=[], output_type=cg.int_)
-    cg.add(var.set_width(width))
+    if width_config := item_config.get(CONF_WIDTH):
+        if width_config in UNSET_DIMENSION_MODE:
+            cg.add(
+                var.set_unset_width_uses_display_width(
+                    width_config.upper() == "DISPLAY"
+                )
+            )
+        else:
+            width = await cg.templatable(width_config, args=[], output_type=cg.int_)
+            cg.add(var.set_width(width))
 
-    height = await cg.templatable(
-        item_config[CONF_HEIGHT], args=[], output_type=cg.int_
-    )
-    cg.add(var.set_height(height))
+    if height_config := item_config.get(CONF_HEIGHT):
+        if height_config in UNSET_DIMENSION_MODE:
+            cg.add(
+                var.set_unset_height_uses_display_height(
+                    height_config.upper() == "DISPLAY"
+                )
+            )
+        else:
+            height = await cg.templatable(
+                item_config[CONF_HEIGHT], args=[], output_type=cg.int_
+            )
+            cg.add(var.set_height(height))
 
     child_item_config = item_config[CONF_CHILD]
     child_item_type = child_item_config[CONF_TYPE]