firmware/src/graphics/niche/InkHUD/Applets/Examples/NewMsgExample/NewMsgExampleApplet.cpp

#ifdef MESHTASTIC_INCLUDE_INKHUD

#include "./NewMsgExampleApplet.h"

using namespace NicheGraphics;

// We configured the Module API to call this method when we receive a new text message
ProcessMessage InkHUD::NewMsgExampleApplet::handleReceived(const meshtastic_MeshPacket &mp) {

  // Abort if applet fully deactivated
  // Don't waste time: we wouldn't be rendered anyway
  if (!isActive())
    return ProcessMessage::CONTINUE;

  // Check that this is an incoming message
  // Outgoing messages (sent by us) will also call handleReceived

  if (!isFromUs(&mp)) {
    // Store the sender's nodenum
    // We need to keep this information, so we can re-use it anytime render() is called
    haveMessage = true;
    fromWho = mp.from;

    // Tell InkHUD that we have something new to show on the screen
    requestUpdate();
  }

  // Tell Module API to continue informing other firmware components about this message
  // We're not the only component which is interested in new text messages
  return ProcessMessage::CONTINUE;
}

// All drawing happens here
// We can trigger a render by calling requestUpdate()
// Render might be called by some external source
// We should always be ready to draw
void InkHUD::NewMsgExampleApplet::onRender() {
  printAt(0, 0, "Example: NewMsg", LEFT, TOP); // Print top-left corner of text at (0,0)

  int16_t centerX = X(0.5); // Same as width() / 2
  int16_t centerY = Y(0.5); // Same as height() / 2

  if (haveMessage) {
    printAt(centerX, centerY, "New Message", CENTER, BOTTOM);
    printAt(centerX, centerY, "From: " + hexifyNodeNum(fromWho), CENTER, TOP);
  } else {
    printAt(centerX, centerY, "No Message", CENTER, MIDDLE); // Place center of string at (centerX, centerY)
  }
}

#endif