From 4e7fb37a14ba7186455760ecf30d766f289e9474 Mon Sep 17 00:00:00 2001
From: Jack Burgess <jackburgess124@gmail.com>
Date: Sun, 13 Mar 2022 00:47:05 +0000
Subject: [PATCH] Add "actions" to buttons, allowing custom callbacks to be
 attached to buttons

---
 Extensions/Button.cpp | 14 ++++++++++++++
 Extensions/Button.h   |  8 ++++++++
 2 files changed, 22 insertions(+)

diff --git a/Extensions/Button.cpp b/Extensions/Button.cpp
index 475c631..48dcc6c 100644
--- a/Extensions/Button.cpp
+++ b/Extensions/Button.cpp
@@ -8,6 +8,13 @@ TFT_eSPI_Button::TFT_eSPI_Button(void) {
   _yd        = 0;
   _textdatum = MC_DATUM;
   _label[9]  = '\0';
+  _actionFunction = NULL;
+}
+
+// Set custom callback allowing arbitrary effects
+void TFT_eSPI_Button::setButtonAction(ButtonActionFunction buttonActionFunction)
+{
+  _actionFunction = buttonActionFunction;
 }
 
 // Classic initButton() function: pass center & size
@@ -103,3 +110,10 @@ void TFT_eSPI_Button::press(bool p) {
 bool TFT_eSPI_Button::isPressed()    { return currstate; }
 bool TFT_eSPI_Button::justPressed()  { return (currstate && !laststate); }
 bool TFT_eSPI_Button::justReleased() { return (!currstate && laststate); }
+
+
+void TFT_eSPI_Button::action() {
+  if (_actionFunction != NULL) {
+    _actionFunction();
+  }
+}
diff --git a/Extensions/Button.h b/Extensions/Button.h
index 7e0c509..a21d28b 100644
--- a/Extensions/Button.h
+++ b/Extensions/Button.h
@@ -6,6 +6,8 @@
 // within button
 ***************************************************************************************/
 
+typedef void (*ButtonActionFunction)(void);
+
 class TFT_eSPI_Button : public TFT_eSPI {
 
  public:
@@ -26,6 +28,10 @@ class TFT_eSPI_Button : public TFT_eSPI {
   void     drawButton(bool inverted = false, String long_name = "");
   bool     contains(int16_t x, int16_t y);
 
+  // Set custom callback allowing arbitrary effects
+  void     setButtonAction(ButtonActionFunction actionFunction);
+  void     action(void);
+
   void     press(bool p);
   bool     isPressed();
   bool     justPressed();
@@ -41,4 +47,6 @@ class TFT_eSPI_Button : public TFT_eSPI {
   char     _label[10]; // Button text is 9 chars maximum unless long_name used
 
   bool  currstate, laststate; // Button states
+
+  ButtonActionFunction _actionFunction; // Action callback
 };