Implement API method for display header text

2 files changed, 26 insertions, 0 deletions

diff --git a/api.cpp b/api.cpp
index 2617483..7279f19 100644
--- a/api.cpp
+++ b/api.cpp
@@ -107,6 +107,25 @@ bool Api::gui_footer_text(std::string text, int offset_x, int offset_row, int in
     oledWriteString(&m_oled, 0,offset_x,7-offset_row, &text[0], font, invert, 1);
 }
 
+bool Api::gui_header_text(std::string text, int offset_x, int offset_row, int invert) {
+    // Max chars per line for FONT_8x8 is 16 chars
+    // Max chars per line for FONT_6x8 is 21 chars
+    // Truncate longer text
+    if (text.size() > 21)
+        text.resize(21);
+    
+    // Choose most adapted font size
+    int font;
+    if (text.size() > 16)
+        font = FONT_6x8;
+    else
+        font = FONT_8x8;
+    
+    oledRectangle(&m_oled, 0,0, 128,8, invert, 1);
+    oledDumpBuffer(&m_oled, m_ucBuffer);
+    oledWriteString(&m_oled, 0,offset_x,0+offset_row, &text[0], font, invert, 1);
+}
+
 bool Api::datetime_get(datetime_t *t) {
     return rtc_get_datetime(t);
 }
diff --git a/api.hpp b/api.hpp
index 9dabacf..7e2a3e9 100644
--- a/api.hpp
+++ b/api.hpp
@@ -37,6 +37,13 @@ class Api {
         // \param offset_row Allow rendering the text higher. For example, one line higher when `offset_row = 1`.
         // \param invert allow inverting text and background color.
         bool gui_footer_text(std::string text, int offset_x = 0, int offset_row = 0, int invert = 0);
+        // Display text at the top of the screen.
+        // The font size is automatically choosen based on the text lenght.
+        // \param text Text to display. Text longer than 21 will be truncated.
+        // \param offset_x Set a horizental offset, to allow, for example, centering the text
+        // \param offset_row Render text lines lower. For example, one text line lower with `offset_row = 1`.
+        // \param invert Invert text and background color.
+        bool gui_header_text(std::string text, int offset_x = 0, int offset_row = 0, int invert = 0);
         bool datetime_get(datetime_t *t);
         // Get last button pressed, see buttons.hpp for values
         uint button_last_get();