Repo created

libs/drape_frontend/gui/skin.cpp

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+#include "drape_frontend/gui/skin.hpp"
+
+#include "platform/platform.hpp"
+
+#include "coding/parse_xml.hpp"
+
+#include "base/string_utils.hpp"
+
+#include <memory>
+
+namespace gui
+{
+namespace
+{
+#ifdef DEBUG
+bool IsSimple(dp::Anchor anchor)
+{
+  return anchor >= 0 && anchor <= 8;
+}
+
+bool IsAnchor(dp::Anchor anchor)
+{
+  return anchor >= 0 && anchor <= 10;
+}
+#endif
+
+dp::Anchor ParseValueAnchor(std::string_view value)
+{
+  if (value == "center")
+    return dp::Center;
+  if (value == "left")
+    return dp::Left;
+  if (value == "right")
+    return dp::Right;
+  if (value == "top")
+    return dp::Top;
+  if (value == "bottom")
+    return dp::Bottom;
+  else
+    ASSERT(false, ());
+
+  return dp::Center;
+}
+
+dp::Anchor MergeAnchors(dp::Anchor src, dp::Anchor dst)
+{
+  ASSERT(IsSimple(dst), ());
+  ASSERT(IsSimple(src), ());
+  dp::Anchor result = static_cast<dp::Anchor>(src | dst);
+  ASSERT(IsAnchor(result), ());
+  return result;
+}
+
+float ParseFloat(char const * v)
+{
+  float f = 0.0f;
+  VERIFY(strings::to_float(v, f), ());
+  return f;
+}
+
+class ResolverParser
+{
+public:
+  enum class Element
+  {
+    Empty,
+    Anchor,
+    Relative,
+    Offset
+  };
+
+  ResolverParser() : m_element(Element::Empty) {}
+
+  void Parse(std::string_view attr, char const * value)
+  {
+    ASSERT(m_element != Element::Empty, ());
+
+    if (attr == "x")
+    {
+      ASSERT(m_element == Element::Offset, ());
+      m_resolver.SetOffsetX(ParseFloat(value));
+    }
+    else if (attr == "y")
+    {
+      ASSERT(m_element == Element::Offset, ());
+      m_resolver.SetOffsetY(ParseFloat(value));
+    }
+    else if (attr == "vertical" || attr == "horizontal")
+    {
+      if (m_element == Element::Anchor)
+        m_resolver.AddAnchor(ParseValueAnchor(value));
+      else if (m_element == Element::Relative)
+        m_resolver.AddRelative(ParseValueAnchor(value));
+      else
+        ASSERT(false, ());
+    }
+  }
+
+  void Reset() { m_resolver = PositionResolver(); }
+
+  PositionResolver const & GetResolver() const { return m_resolver; }
+
+  void SetElement(Element e) { m_element = e; }
+
+private:
+  Element m_element;
+  PositionResolver m_resolver;
+};
+
+class SkinLoader
+{
+public:
+  explicit SkinLoader(std::map<EWidget, std::pair<PositionResolver, PositionResolver>> & skin) : m_skin(skin) {}
+
+  bool Push(std::string_view element)
+  {
+    if (!m_inElement)
+    {
+      if (element == "root")
+        return true;
+
+      m_inElement = true;
+      if (element == "ruler")
+        m_currentElement = WIDGET_RULER;
+      else if (element == "compass")
+        m_currentElement = WIDGET_COMPASS;
+      else if (element == "copyright")
+        m_currentElement = WIDGET_COPYRIGHT;
+      else
+        ASSERT(false, ());
+    }
+    else if (!m_inConfiguration)
+    {
+      if (element == "portrait" || element == "landscape")
+        m_inConfiguration = true;
+      else
+        ASSERT(false, ());
+    }
+    else
+    {
+      if (element == "anchor")
+        m_parser.SetElement(ResolverParser::Element::Anchor);
+      else if (element == "relative")
+        m_parser.SetElement(ResolverParser::Element::Relative);
+      else if (element == "offset")
+        m_parser.SetElement(ResolverParser::Element::Offset);
+      else
+        ASSERT(false, ());
+    }
+
+    return true;
+  }
+
+  void Pop(std::string_view element)
+  {
+    if (element == "anchor" || element == "relative" || element == "offset")
+      m_parser.SetElement(ResolverParser::Element::Empty);
+    else if (element == "portrait")
+    {
+      m_skin[m_currentElement].first = m_parser.GetResolver();
+      m_parser.Reset();
+      m_inConfiguration = false;
+    }
+    else if (element == "landscape")
+    {
+      m_skin[m_currentElement].second = m_parser.GetResolver();
+      m_parser.Reset();
+      m_inConfiguration = false;
+    }
+    else if (element == "ruler" || element == "compass" || element == "copyright" || element == "country_status")
+    {
+      m_inElement = false;
+    }
+  }
+
+  void AddAttr(std::string_view attribute, char const * value) { m_parser.Parse(attribute, value); }
+
+  void CharData(std::string const &) {}
+
+private:
+  bool m_inConfiguration = false;
+  bool m_inElement = false;
+
+  EWidget m_currentElement = WIDGET_RULER;
+  ResolverParser m_parser;
+
+  std::map<EWidget, std::pair<PositionResolver, PositionResolver>> & m_skin;
+};
+}  // namespace
+
+Position PositionResolver::Resolve(int w, int h, double vs) const
+{
+  float resultX = w / 2.0f;
+  float resultY = h / 2.0f;
+  m2::PointF offset = m_offset * vs;
+
+  if (m_resolveAnchor & dp::Left)
+    resultX = offset.x;
+  else if (m_resolveAnchor & dp::Right)
+    resultX = w - offset.x;
+  else
+    resultX += offset.x;
+
+  if (m_resolveAnchor & dp::Top)
+    resultY = offset.y;
+  else if (m_resolveAnchor & dp::Bottom)
+    resultY = h - offset.y;
+  else
+    resultY += offset.y;
+
+  return Position(m2::PointF(resultX, resultY), m_elementAnchor);
+}
+
+void PositionResolver::AddAnchor(dp::Anchor anchor)
+{
+  m_elementAnchor = MergeAnchors(m_elementAnchor, anchor);
+}
+
+void PositionResolver::AddRelative(dp::Anchor anchor)
+{
+  m_resolveAnchor = MergeAnchors(m_resolveAnchor, anchor);
+}
+
+void PositionResolver::SetOffsetX(float x)
+{
+  m_offset.x = x;
+}
+
+void PositionResolver::SetOffsetY(float y)
+{
+  m_offset.y = y;
+}
+
+Skin::Skin(ReaderPtr<Reader> const & reader, float visualScale) : m_visualScale(visualScale)
+{
+  SkinLoader loader(m_resolvers);
+  ReaderSource<ReaderPtr<Reader>> source(reader);
+  if (!ParseXML(source, loader))
+    LOG(LERROR, ("Error parsing gui skin"));
+}
+
+Position Skin::ResolvePosition(EWidget name)
+{
+  // check that name have only one bit
+  ASSERT((static_cast<int>(name) & (static_cast<int>(name) - 1)) == 0, ());
+  TResolversPair const & resolvers = m_resolvers[name];
+  PositionResolver const & resolver = (m_displayWidth < m_displayHeight) ? resolvers.first : resolvers.second;
+  return resolver.Resolve(m_displayWidth, m_displayHeight, m_visualScale);
+}
+
+void Skin::Resize(int w, int h)
+{
+  m_displayWidth = w;
+  m_displayHeight = h;
+}
+
+ReaderPtr<Reader> ResolveGuiSkinFile(std::string const & deviceType)
+{
+  Platform & pl = GetPlatform();
+  std::unique_ptr<Reader> reader;
+  try
+  {
+    reader = pl.GetReader("symbols/default/" + deviceType + ".ui");
+  }
+  catch (FileAbsentException & e)
+  {
+    LOG(LINFO, ("Gui skin for : ", deviceType, "not found"));
+  }
+
+  if (!reader)
+  {
+    try
+    {
+      reader = pl.GetReader("symbols/default/default.ui");
+    }
+    catch (FileAbsentException & e)
+    {
+      LOG(LINFO, ("Default gui skin not found"));
+      throw e;
+    }
+  }
+
+  return ReaderPtr<Reader>(std::move(reader));
+}
+}  // namespace gui