Roller finished

2020-04-20 19:25:26 +02:00
parent 71ccf023b1
commit 03ac973d7b
1 changed files with 114 additions and 0 deletions
@@ -0,0 +1,114 @@
+/*
+ * 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 _ROLLER_H_
+#define _ROLLER_H_
+
+#include <touch.h>
+#include <choice.h>
+#include <font.h>
+#include <static.h>
+#include "libopenui_globals.h"
+#include "libopenui_config.h"
+
+constexpr WindowFlags ROLLER_SEPARATION_LINES = (FORM_FLAGS_LAST << 1u);
+
+class Roller: public Choice {
+  public:
+    Roller(FormGroup * parent, const rect_t & rect, const char * label, const char ** values, int16_t vmin, int16_t vmax, std::function<int16_t()> getValue, std::function<void(int16_t)> setValue = nullptr, WindowFlags windowFlags = ROLLER_SEPARATION_LINES):
+      Choice(parent, rect, values, vmin, vmax, std::move(getValue), std::move(setValue), windowFlags | NO_SCROLLBAR)
+    {
+      if (label) {
+        // the label is another window, could be changed, but is it needed?
+        new StaticText(parent, {rect.x, rect.y - ROLLER_LINE_HEIGHT, rect.w, ROLLER_LINE_HEIGHT}, label, 0, CENTERED);
+      }
+
+      setHeight(ROLLER_LINE_HEIGHT * 3 - 1);
+      setPageHeight(ROLLER_LINE_HEIGHT);
+      setInnerHeight(INFINITE_HEIGHT);
+      setScrollPositionY(ROLLER_LINE_HEIGHT * (this->getValue() - vmin - 1));
+      lastScrollPositionY = scrollPositionY;
+    }
+
+    void paint(BitmapBuffer * dc) override
+    {
+      int32_t value = getValue();
+
+      int index = (scrollPositionY - ROLLER_LINE_HEIGHT + 1)  / ROLLER_LINE_HEIGHT;
+      coord_t y = index * ROLLER_LINE_HEIGHT;
+      coord_t yMax = scrollPositionY + 3 * ROLLER_LINE_HEIGHT;
+
+      while (y < yMax) {
+        auto displayedValue = vmin + index % (vmax - vmin + 1);
+        if (displayedValue < vmin)
+          displayedValue += vmax - vmin + 1;
+
+        auto fgColor = DISABLE_COLOR;
+
+        if (value == displayedValue) {
+          fgColor = FOCUS_COLOR | FONT(STD);
+        }
+
+        if ((unsigned)displayedValue < values.size()) {
+          dc->drawText(width() / 2, y, values[displayedValue].c_str(), fgColor | CENTERED);
+        }
+        else {
+          dc->drawNumber(width() / 2, y, displayedValue, fgColor | CENTERED);
+        }
+
+        if (windowFlags & ROLLER_SEPARATION_LINES) {
+          dc->drawSolidHorizontalLine(0, y - 10, width(), DISABLE_COLOR);
+        }
+
+        index += 1;
+        y += ROLLER_LINE_HEIGHT;
+      }
+    }
+
+    void checkEvents() override
+    {
+      Window::checkEvents();
+
+#if defined(HARDWARE_TOUCH)
+      if (touchState.event != TE_SLIDE) {
+        if (scrollPositionY != lastScrollPositionY) {
+          updateScrollPosition();
+        }
+      }
+#endif
+    }
+
+
+  protected:
+    coord_t lastScrollPositionY = 0;
+
+    void updateScrollPosition()
+    {
+      lastScrollPositionY = scrollPositionY;
+
+      auto newValue = vmin + ((scrollPositionY / ROLLER_LINE_HEIGHT) + 1) % (vmax - vmin + 1);
+      if (newValue < vmin)
+        newValue += vmax - vmin + 1;
+
+      setValue(newValue);
+      invalidate();
+    }
+};
+
+#endif // _ROLLER_H_