Add get_size method to QR Code header (#6430)

esphome/components/qr_code/qr_code.cpp

@@ -51,5 +51,17 @@ void QrCode::draw(display::Display *buff, uint16_t x_offset, uint16_t y_offset,
     }
   }
 }
+
+uint8_t QrCode::get_size() {
+  if (this->needs_update_) {
+    this->generate_qr_code();
+    this->needs_update_ = false;
+  }
+
+  uint8_t size = qrcodegen_getSize(this->qr_);
+
+  return size;
+}
+
 }  // namespace qr_code
 }  // namespace esphome

esphome/components/qr_code/qr_code.h

@@ -24,6 +24,8 @@ class QrCode : public Component {
 
   void generate_qr_code();
 
+  uint8_t get_size();
+
  protected:
   std::string value_;
   qrcodegen_Ecc ecc_;

tests/components/qr_code/test.esp32-c3-idf.yaml

@@ -11,6 +11,13 @@ display:
     cs_pin: 8
     dc_pin: 9
     reset_pin: 10
+    lambda: |-
+      // Draw a QR code in the center of the screen
+      auto scale = 2;
+      auto size = id(homepage_qr).get_size() * scale;
+      auto x = (it.get_width() / 2) - (size / 2);
+      auto y = (it.get_height() / 2) - (size / 2);
+      it.qr_code(x, y, id(homepage_qr), Color(255,255,255), scale);
 
 qr_code:
   - id: homepage_qr

tests/components/qr_code/test.esp32-c3.yaml

@@ -11,6 +11,13 @@ display:
     cs_pin: 8
     dc_pin: 9
     reset_pin: 10
+    lambda: |-
+      // Draw a QR code in the center of the screen
+      auto scale = 2;
+      auto size = id(homepage_qr).get_size() * scale;
+      auto x = (it.get_width() / 2) - (size / 2);
+      auto y = (it.get_height() / 2) - (size / 2);
+      it.qr_code(x, y, id(homepage_qr), Color(255,255,255), scale);
 
 qr_code:
   - id: homepage_qr

tests/components/qr_code/test.esp32-idf.yaml

@@ -11,6 +11,13 @@ display:
     cs_pin: 12
     dc_pin: 13
     reset_pin: 21
+    lambda: |-
+      // Draw a QR code in the center of the screen
+      auto scale = 2;
+      auto size = id(homepage_qr).get_size() * scale;
+      auto x = (it.get_width() / 2) - (size / 2);
+      auto y = (it.get_height() / 2) - (size / 2);
+      it.qr_code(x, y, id(homepage_qr), Color(255,255,255), scale);
 
 qr_code:
   - id: homepage_qr

tests/components/qr_code/test.esp32.yaml

@@ -11,6 +11,13 @@ display:
     cs_pin: 12
     dc_pin: 13
     reset_pin: 21
+    lambda: |-
+      // Draw a QR code in the center of the screen
+      auto scale = 2;
+      auto size = id(homepage_qr).get_size() * scale;
+      auto x = (it.get_width() / 2) - (size / 2);
+      auto y = (it.get_height() / 2) - (size / 2);
+      it.qr_code(x, y, id(homepage_qr), Color(255,255,255), scale);
 
 qr_code:
   - id: homepage_qr

tests/components/qr_code/test.esp8266.yaml

@@ -11,6 +11,13 @@ display:
     cs_pin: 5
     dc_pin: 15
     reset_pin: 16
+    lambda: |-
+      // Draw a QR code in the center of the screen
+      auto scale = 2;
+      auto size = id(homepage_qr).get_size() * scale;
+      auto x = (it.get_width() / 2) - (size / 2);
+      auto y = (it.get_height() / 2) - (size / 2);
+      it.qr_code(x, y, id(homepage_qr), Color(255,255,255), scale);
 
 qr_code:
   - id: homepage_qr

tests/components/qr_code/test.rp2040.yaml

@@ -11,6 +11,13 @@ display:
     cs_pin: 20
     dc_pin: 21
     reset_pin: 22
+    lambda: |-
+      // Draw a QR code in the center of the screen
+      auto scale = 2;
+      auto size = id(homepage_qr).get_size() * scale;
+      auto x = (it.get_width() / 2) - (size / 2);
+      auto y = (it.get_height() / 2) - (size / 2);
+      it.qr_code(x, y, id(homepage_qr), Color(255,255,255), scale);
 
 qr_code:
   - id: homepage_qr