From 2a0b3b30b63860e3c062397cf5a91e05f5e9b376 Mon Sep 17 00:00:00 2001
From: Bertrand Songis <bsongis@gmail.com>
Date: Mon, 6 Apr 2020 09:16:40 +0200
Subject: [PATCH] Generic carousel added

---
 .../thirdparty/libopenui/src/CMakeLists.txt   |   1 +
 .../src/thirdparty/libopenui/src/carousel.cpp |  58 +++++++++
 radio/src/thirdparty/libopenui/src/carousel.h | 118 ++++++++++++++++++
 3 files changed, 177 insertions(+)
 create mode 100644 radio/src/thirdparty/libopenui/src/carousel.cpp
 create mode 100644 radio/src/thirdparty/libopenui/src/carousel.h

diff --git a/radio/src/thirdparty/libopenui/src/CMakeLists.txt b/radio/src/thirdparty/libopenui/src/CMakeLists.txt
index 788521440..f6712eea4 100644
--- a/radio/src/thirdparty/libopenui/src/CMakeLists.txt
+++ b/radio/src/thirdparty/libopenui/src/CMakeLists.txt
@@ -19,6 +19,7 @@ set(LIBOPENUI_SRC
   button.cpp
   static.cpp
   checkbox.cpp
+  carousel.cpp
   slider.cpp
   mainwindow.cpp
   menu.cpp
diff --git a/radio/src/thirdparty/libopenui/src/carousel.cpp b/radio/src/thirdparty/libopenui/src/carousel.cpp
new file mode 100644
index 000000000..108cf166d
--- /dev/null
+++ b/radio/src/thirdparty/libopenui/src/carousel.cpp
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) OpenTX
+ *
+ * Source:
+ *  https://github.com/opentx/libopenui
+ *
+ * This file is a part of libopenui library.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ */
+
+#include "carousel.h"
+
+void CarouselWindow::update()
+{
+  auto first = min<int>(selection - 2, items.size() - 5);
+  first = max(0, first);
+  coord_t lastPosition = 0;
+
+  for (auto & item: items) {
+    item.front->detach();
+    item.back->detach();
+  }
+
+  for (uint8_t index = first; lastPosition < width() && index < items.size(); index++) {
+    auto & item = items[index];
+    auto window = (index == selection ? item.front : item.back);
+    window->attach(this);
+    window->setLeft(lastPosition);
+    window->setTop((height() - window->height()) / 2);
+    lastPosition += window->width() + CAROUSEL_SPACING;
+  }
+}
+
+void Carousel::onEvent(event_t event)
+{
+  TRACE_WINDOWS("%s received event 0x%X", getWindowDebugString().c_str(), event);
+
+  if (event == EVT_ROTARY_RIGHT) {
+    if (body->selection < body->items.size() - 1)
+      select(body->selection + 1);
+  }
+  else if (event == EVT_ROTARY_LEFT) {
+    if (body->selection > 0)
+      select(body->selection - 1);
+  }
+  else {
+    Window::onEvent(event);
+  }
+}
diff --git a/radio/src/thirdparty/libopenui/src/carousel.h b/radio/src/thirdparty/libopenui/src/carousel.h
new file mode 100644
index 000000000..f81893430
--- /dev/null
+++ b/radio/src/thirdparty/libopenui/src/carousel.h
@@ -0,0 +1,118 @@
+/*
+ * Copyright (C) OpenTX
+ *
+ * Source:
+ *  https://github.com/opentx/libopenui
+ *
+ * This file is a part of libopenui library.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ */
+
+#ifndef _CAROUSEL_H_
+#define _CAROUSEL_H_
+
+#include <vector>
+#include "button.h"
+
+constexpr coord_t CAROUSEL_SPACING = 20;
+
+class CarouselItem {
+  public:
+    CarouselItem(Window * front, Window * back):
+      front(front),
+      back(back)
+    {
+    }
+
+  public:
+    Window * front;
+    Window * back;
+};
+
+class CarouselWindow: public Window {
+  friend class Carousel;
+
+  public:
+    CarouselWindow(Window * parent, const rect_t & rect):
+      Window(parent, rect, NO_SCROLLBAR)
+    {
+    }
+
+    void addItem(CarouselItem item)
+    {
+      items.emplace_back(item);
+      update();
+    }
+
+    void clear()
+    {
+      items.clear();
+      Window::clear();
+    }
+
+    void select(int index, bool scroll = true)
+    {
+      selection = index;
+      update();
+    }
+
+    int selection = 0;
+
+  protected:
+    std::vector<CarouselItem> items;
+
+    void update();
+};
+
+class Carousel: public Window {
+  public:
+    Carousel(Window * parent, const rect_t & rect):
+      Window(parent, rect, NO_SCROLLBAR)
+    {
+    }
+
+#if defined(DEBUG_WINDOWS)
+    std::string getName() override
+    {
+      return "Carousel";
+    }
+#endif
+
+    void addItem(CarouselItem item)
+    {
+      body->addItem(std::move(item));
+    }
+
+    void clear()
+    {
+      body->clear();
+    }
+
+    void select(int index)
+    {
+      body->select(index);
+      previousButton->enable(index > 0);
+      nextButton->enable(index < (int)body->items.size() - 1);
+    }
+
+
+#if defined(HARDWARE_KEYS)
+    void onEvent(event_t event) override;
+#endif
+
+  protected:
+    Button * previousButton = nullptr;
+    Button * nextButton = nullptr;
+    CarouselWindow * body = nullptr;
+};
+
+#endif // _CAROUSEL_H_