Revert "Revert "Merge pull request #540 from justcallmekoko/master""

This reverts commit 38a05776.

Extensions/Button.cpp

@@ -4,6 +4,9 @@
 ***************************************************************************************/
 TFT_eSPI_Button::TFT_eSPI_Button(void) {
   _gfx       = 0;
+  _xd        = 0;
+  _yd        = 0;
+  _textdatum = MC_DATUM;
 }
 
 // Classic initButton() function: pass center & size
@@ -35,7 +38,15 @@ void TFT_eSPI_Button::initButtonUL(
   strncpy(_label, label, 9);
 }
 
-void TFT_eSPI_Button::drawButton(bool inverted) {
+// Adjust text datum and x, y deltas
+void TFT_eSPI_Button::setLabelDatum(int16_t x_delta, int16_t y_delta, uint8_t datum)
+{
+  _xd        = x_delta;
+  _yd        = y_delta;
+  _textdatum = datum;
+}
+
+void TFT_eSPI_Button::drawButton(bool inverted, String long_name) {
   uint16_t fill, outline, text;
 
   if(!inverted) {
@@ -56,8 +67,11 @@ void TFT_eSPI_Button::drawButton(bool inverted) {
   _gfx->setTextSize(_textsize);
 
   uint8_t tempdatum = _gfx->getTextDatum();
-  _gfx->setTextDatum(MC_DATUM);
-  _gfx->drawString(_label, _x1 + (_w/2), _y1 + (_h/2) -4);
+  _gfx->setTextDatum(_textdatum);
+  if (long_name == "")
+    _gfx->drawString(_label, _x1 + _xd, _y1 + (_h/2) + _yd);
+  else
+    _gfx->drawString(long_name, _x1 + _xd, _y1 + (_h/2) + _yd);
   _gfx->setTextDatum(tempdatum);
 }
 

Extensions/Button.h

@@ -18,7 +18,11 @@ class TFT_eSPI_Button {
   void     initButtonUL(TFT_eSPI *gfx, int16_t x1, int16_t y1,
   uint16_t w, uint16_t h, uint16_t outline, uint16_t fill,
   uint16_t textcolor, char *label, uint8_t textsize);
-  void     drawButton(bool inverted = false);
+  
+  // Adjust text datum and x, y deltas
+  void setLabelDatum(int16_t x_delta, int16_t y_delta, uint8_t datum = MC_DATUM);
+  
+  void     drawButton(bool inverted = false, String long_name = "");
   bool  contains(int16_t x, int16_t y);
 
   void     press(bool p);
@@ -28,9 +32,9 @@ class TFT_eSPI_Button {
 
  private:
   TFT_eSPI *_gfx;
-  int16_t  _x1, _y1; // Coordinates of top-left corner
+  int16_t  _x1, _y1, _xd, _yd; // Coordinates of top-left corner
   uint16_t _w, _h;
-  uint8_t  _textsize;
+  uint8_t  _textsize, _textdatum;
   uint16_t _outlinecolor, _fillcolor, _textcolor;
   char     _label[10];
 

examples/Generic/TFT_Button_Label_Datum/TFT_Button_Label_Datum.ino

+/*
+  The TFT_eSPI library incorporates an Adafruit_GFX compatible
+  button handling class.
+
+  This example displays a column of buttons with varying label
+  alignments.
+
+  The sketch has been tested on the ESP32 (which supports SPIFFS)
+
+  Adjust the definitions below according to your screen size
+*/
+
+#include "FS.h"
+
+#include <SPI.h>
+
+#include <TFT_eSPI.h>
+
+TFT_eSPI tft = TFT_eSPI();
+
+// This is the file name used to store the calibration data
+// You can change this to create new calibration files.
+// The SPIFFS file name must start with "/".
+#define CALIBRATION_FILE "/TouchCalData1"
+
+// Set REPEAT_CAL to true instead of false to run calibration
+// again, otherwise it will only be done once.
+// Repeat calibration if you change the screen rotation.
+#define REPEAT_CAL false
+
+// Keypad start position, key sizes and spacing
+#define KEY_X 160 // Centre of key
+#define KEY_Y 50
+#define KEY_W 320 // Width and height
+#define KEY_H 22
+#define KEY_SPACING_X 0 // X and Y gap
+#define KEY_SPACING_Y 1
+#define KEY_TEXTSIZE 1   // Font size multiplier
+#define BUTTON_X_DELTA 22
+#define NUM_KEYS 6
+
+TFT_eSPI_Button key[NUM_KEYS];
+
+void setup() {
+  
+  Serial.begin(115200);
+  
+  tft.init();
+
+  // Set the rotation before we calibrate
+  tft.setRotation(1);
+
+  // Check for backlight pin if not connected to VCC
+  #ifndef TFT_BL
+    Serial.println("No TFT backlight pin defined");
+  #else
+    pinMode(TFT_BL, OUTPUT);
+    digitalWrite(TFT_BL, HIGH);
+  #endif
+
+  // call screen calibration
+  touch_calibrate();
+
+  // Clear screen
+  tft.fillScreen(TFT_BLACK);
+
+  tft.setFreeFont(&FreeMono9pt7b);
+  
+  drawButtons();
+}
+
+void loop() {
+  uint16_t t_x = 0, t_y = 0; // To store the touch coordinates
+
+  // Get current touch state and coordinates
+  boolean pressed = tft.getTouch(&t_x, &t_y);
+
+  // Adjust press state of each key appropriately
+  for (uint8_t b = 0; b < NUM_KEYS; b++) {
+    if (pressed && key[b].contains(t_x, t_y)) 
+      key[b].press(true);  // tell the button it is pressed
+    else
+      key[b].press(false);  // tell the button it is NOT pressed
+  }
+
+  // Check if any key has changed state
+  for (uint8_t b = 0; b < NUM_KEYS; b++) {
+    // If button was just pressed, redraw inverted button
+    if (key[b].justPressed()) {
+      Serial.println("Button " + (String)b + " pressed");
+      key[b].drawButton(true, "ML_DATUM + " + (String)(b * 10) + "px");
+    }
+
+    // If button was just released, redraw normal color button
+    if (key[b].justReleased()) {
+      Serial.println("Button " + (String)b + " released");
+      key[b].drawButton(false, "ML_DATUM + " + (String)(b * 10) + "px");
+    }
+  }
+
+}
+
+void drawButtons()
+{
+  // Generate buttons with different size X deltas
+  for (int i = 0; i < NUM_KEYS; i++)
+  {
+    key[i].initButton(&tft,
+                      KEY_X + 0 * (KEY_W + KEY_SPACING_X),
+                      KEY_Y + i * (KEY_H + KEY_SPACING_Y), // x, y, w, h, outline, fill, text
+                      KEY_W,
+                      KEY_H,
+                      TFT_BLACK, // Outline
+                      TFT_CYAN, // Fill
+                      TFT_BLACK, // Text
+                      "", // 10 Byte Label
+                      KEY_TEXTSIZE);
+
+    // Adjust button label X delta according to array position
+    // setLabelDatum(uint16_t x_delta, uint16_t y_delta, uint8_t datum)
+    key[i].setLabelDatum(i * 10, 0, ML_DATUM);
+
+    // Draw button and specify label string
+    // Specifying label string here will allow more than the default 10 byte label
+    key[i].drawButton(false, "ML_DATUM + " + (String)(i * 10) + "px");
+  }
+}
+
+void touch_calibrate()
+{
+  uint16_t calData[5];
+  uint8_t calDataOK = 0;
+
+  // check file system exists
+  if (!SPIFFS.begin()) {
+    Serial.println("Formating file system");
+    SPIFFS.format();
+    SPIFFS.begin();
+  }
+
+  // check if calibration file exists and size is correct
+  if (SPIFFS.exists(CALIBRATION_FILE)) {
+    if (REPEAT_CAL)
+    {
+      // Delete if we want to re-calibrate
+      SPIFFS.remove(CALIBRATION_FILE);
+    }
+    else
+    {
+      File f = SPIFFS.open(CALIBRATION_FILE, "r");
+      if (f) {
+        if (f.readBytes((char *)calData, 14) == 14)
+          calDataOK = 1;
+        f.close();
+      }
+    }
+  }
+
+  if (calDataOK && !REPEAT_CAL) {
+    // calibration data valid
+    tft.setTouch(calData);
+  } else {
+    // data not valid so recalibrate
+    tft.fillScreen(TFT_BLACK);
+    tft.setCursor(20, 0);
+    tft.setTextFont(2);
+    tft.setTextSize(1);
+    tft.setTextColor(TFT_WHITE, TFT_BLACK);
+
+    tft.println("Touch corners as indicated");
+
+    tft.setTextFont(1);
+    tft.println();
+
+    if (REPEAT_CAL) {
+      tft.setTextColor(TFT_RED, TFT_BLACK);
+      tft.println("Set REPEAT_CAL to false to stop this running again!");
+    }
+
+    tft.calibrateTouch(calData, TFT_MAGENTA, TFT_BLACK, 15);
+
+    tft.setTextColor(TFT_GREEN, TFT_BLACK);
+    tft.println("Calibration complete!");
+
+    // store data
+    File f = SPIFFS.open(CALIBRATION_FILE, "w");
+    if (f) {
+      f.write((const unsigned char *)calData, 14);
+      f.close();
+    }
+  }
+}