Roughing some transition work

source/Core/Threads/GUIRendering.md

@@ -7,6 +7,17 @@ This is due to a few aims:
 2. Allows external events to change the state
 3. Means state can be read/write over BLE or other external control interfaces
 
+## Transitions
+
+When changing the view to a new view it can be preferable to transition using an animation.
+The tooling provides for left, right and down animations at this point.
+The use of these gives a notion of "direction" when navigating the menu.
+
+```
+<TODO>
+
+```
+
 ## TODO notes
 
 On settings menu exit:

source/Core/Threads/GUIThread.cpp

@@ -43,7 +43,7 @@ void guiRenderLoop(void) {
   OLED::clearScreen(); // Clear ready for render pass
   // Read button state
   ButtonState buttons = getButtonState();
-  // Enforce screen on if buttons pressed
+  // Enforce screen on if buttons pressed, movement, hot tip etc
   if (buttons != BUTTON_NONE) {
     OLED::setDisplayState(OLED::DisplayState::ON);
   } else {
@@ -112,15 +112,34 @@ void guiRenderLoop(void) {
   case OperatingMode::ThermalRunaway:
     break;
   };
-  // Render done, draw it out
-  OLED::refresh();
   // Update state holders
   if (newMode != currentOperatingMode) {
     context.viewEnterTime = xTaskGetTickCount();
     context.previousMode  = currentOperatingMode;
     memset(&context.scratch_state, 0, sizeof(context.scratch_state));
     currentOperatingMode = newMode;
+    // If the transition marker is set, we need to make the next draw occur to the secondary buffer so we have something to transition to
+    if (context.transitionMode != TransitionAnimation::None) {
+      OLED::refresh();
+      OLED::useSecondaryFramebuffer(true);
+      return; // Exit early to avoid refresh with new framebuffer
     }
+  } else if (context.transitionMode != TransitionAnimation::None) {
+    // We haven't changed mode but transition is set, so we are at the other side of a transition
+    // We now want to transition from old contents (main buffer) to new contents (secondary buffer)
+    switch (context.transitionMode) {
+    case TransitionAnimation::Down:
+      break;
+    case TransitionAnimation::Left:
+      break;
+    case TransitionAnimation::Right:
+      break;
+    }
+    OLED::useSecondaryFramebuffer(false);
+    context.transitionMode = TransitionAnimation::None; // Clear transition flag
+  }
+  // Render done, draw it out
+  OLED::refresh();
 }
 
 OperatingMode handle_post_init_state() {

source/Core/Threads/OperatingModes/OperatingModes.h

@@ -41,10 +41,14 @@ enum class OperatingMode {
   ThermalRunaway,     // Thermal Runaway warning state.
 };
 
+enum class TransitionAnimation { None = 0, Right, Left, Down };
+
 // Generic context struct used for gui functions to be able to retain state
 struct guiContext {
   TickType_t          viewEnterTime; // Set to ticks when this view state was first entered
   OperatingMode       previousMode;
+  TransitionAnimation transitionMode;
+  // Below is scratch state, this is retained over re-draws but blown away on state change
   struct scratch {
     uint16_t state1; // 16 bit state scratch
     uint16_t state2; // 16 bit state scratch
@@ -61,6 +65,7 @@ OperatingMode gui_SolderingSleepingMode(const ButtonState buttons, guiContext *c
 OperatingMode gui_solderingMode(const ButtonState buttons, guiContext *cxt);         // Main mode for hot pointy tool
 OperatingMode gui_solderingTempAdjust(const ButtonState buttons, guiContext *cxt);   // For adjusting the setpoint temperature of the iron
 OperatingMode drawHomeScreen(const ButtonState buttons, guiContext *cxt);            // IDLE / Home screen
+OperatingMode gui_SettingsMenu(const ButtonState buttons, guiContext *cxt);          //
 
 OperatingMode gui_solderingProfileMode(const ButtonState buttons, guiContext *cxt); // Profile mode for hot likely-not-so-pointy tool
 OperatingMode performCJCC(const ButtonState buttons, guiContext *cxt);              // Used to calibrate the Cold Junction offset

source/Core/Threads/OperatingModes/SettingsMenu.cpp

@@ -0,0 +1,8 @@
+#include "OperatingModes.h"
+OperatingMode gui_SettingsMenu(const ButtonState buttons, guiContext *cxt) {
+  // Render out the current settings menu
+  // State 1 -> Root menu
+  // State 2 -> Sub entry
+
+  return OperatingMode::SettingsMenu;
+}