Fix the worst of bad dark themes support

Make Poedit usable with dark mode themes that use black or almost-black
backgrounds. There are still more defects in this area that will be
fixed, this fixes only the worst of them, in the main editing window.

More fixes forthcoming.

Fixes #416.
Fixes #273.

src/colorscheme.cpp

@@ -59,8 +59,11 @@ inline wxColour sRGB(int r, int g, int b, double a = 1.0)
 } // anonymous namespace
 
 std::unique_ptr<ColorScheme::Data> ColorScheme::s_data;
+bool ColorScheme::s_appModeDetermined = false;
+ColorScheme::Mode ColorScheme::s_appMode = ColorScheme::Mode::Light;
 
-wxColour ColorScheme::DoGet(Color color, Type type)
+
+wxColour ColorScheme::DoGet(Color color, Mode type)
 {
     switch (color)
     {
@@ -130,9 +133,12 @@ wxColour ColorScheme::DoGet(Color color, Type type)
         // Backgrounds:
 
         case Color::SidebarBackground:
-            return "#edf0f4";
+            if (GetAppMode() == Dark)
+                return "#120f0b";
+            else
+                return "#edf0f4";
         case Color::EditingBackground:
-            return *wxWHITE;
+            return wxSystemSettings::GetColour(wxSYS_COLOUR_LISTBOX);
 
         // Fuzzy toggle:
         case Color::FuzzySwitch:
@@ -184,12 +190,26 @@ wxColour ColorScheme::DoGet(Color color, Type type)
 }
 
 
-ColorScheme::Type ColorScheme::GetSchemeTypeFromWindow(const wxVisualAttributes& win)
+ColorScheme::Mode ColorScheme::GetAppMode()
+{
+    if (!s_appModeDetermined)
+    {
+        auto colBg = wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW);
+        if (colBg.Red() < 0x60 && colBg.Green() < 0x60 && colBg.Blue() < 0x60)
+            s_appMode = Dark;
+        else
+            s_appMode = Light;
+        s_appModeDetermined = true;
+    }
+
+    return s_appMode;
+}
+
+
+ColorScheme::Mode ColorScheme::GetWindowMode(const wxVisualAttributes& win)
 {
     // Use dark scheme for very dark backgrounds:
-    if (win.colBg.Red() < 0x60 &&
-        win.colBg.Green() < 0x60 &&
-        win.colBg.Blue() < 0x60)
+    if (win.colBg.Red() < 0x60 && win.colBg.Green() < 0x60 && win.colBg.Blue() < 0x60)
     {
         return Dark;
     }

src/colorscheme.h

@@ -88,14 +88,14 @@ enum class Color : size_t
 class ColorScheme
 {
 public:
-    /// Type of the scheme to use (not used a lot for now)
-    enum Type
+    /// Mode of the scheme to use (not used a lot for now)
+    enum Mode
     {
         Light,
         Dark
     };
 
-    static const wxColour& Get(Color color, Type type = Light)
+    static const wxColour& Get(Color color, Mode type = Light)
     {
         if (!s_data)
             s_data = std::make_unique<Data>();
@@ -113,11 +113,19 @@ class ColorScheme
 
     static const wxColour& Get(Color color, const wxVisualAttributes& win)
     {
-        return Get(color, GetSchemeTypeFromWindow(win));
+        return Get(color, GetWindowMode(win));
     }
 
     static wxColour GetBlendedOn(Color color, wxWindow *win);
 
+    /// Returns app-wide mode (dark, light)
+    static Mode GetAppMode();
+    static Mode GetWindowMode(const wxVisualAttributes& win);
+    static Mode GetWindowMode(wxWindow *win)
+    {
+        return GetWindowMode(win->GetDefaultAttributes());
+    }
+
     static void CleanUp();
 
 private:
@@ -126,10 +134,11 @@ class ColorScheme
         wxColour colors[static_cast<size_t>(Color::Max)][2];
     };
 
-    static wxColour DoGet(Color color, Type type);
-    static Type GetSchemeTypeFromWindow(const wxVisualAttributes& win);
+    static wxColour DoGet(Color color, Mode type);
 
     static std::unique_ptr<Data> s_data;
+    static bool s_appModeDetermined;
+    static Mode s_appMode;
 };
 
 #endif // Poedit_colorscheme_h

src/editing_area.cpp

@@ -453,6 +453,9 @@ void EditingArea::CreateEditControls(wxBoxSizer *sizer)
 
     m_pluralNotebook = new wxNotebook(this, -1, wxDefaultPosition, wxDefaultSize, wxNB_NOPAGETHEME);
     m_pluralNotebook->SetWindowVariant(wxWINDOW_VARIANT_SMALL);
+#ifdef __WXMSW__
+    m_pluralNotebook->SetBackgroundColour(GetBackgroundColour());
+#endif
 
     sizer->Add(transLineSizer, wxSizerFlags().Expand().Border(wxLEFT|wxTOP, PX(6)));
     sizer->AddSpacer(PX(6));

src/edlistctrl.cpp

@@ -505,6 +505,11 @@ PoeditListCtrl::PoeditListCtrl(wxWindow *parent, wxWindowID id, bool dispIDs)
 
     UpdateHeaderAttrs();
 
+#ifdef __WXMSW__
+    if (ColorScheme::GetWindowMode(this) == ColorScheme::Dark)
+        SetAlternateRowColour(GetBackgroundColour().ChangeLightness(108));
+#endif
+
     Bind(wxEVT_SIZE, &PoeditListCtrl::OnSize, this);
 }
 

src/text_control.cpp

@@ -469,7 +469,7 @@ class AnyTranslatableTextCtrl::Attributes
     NSDictionary *m_attrSpace, *m_attrEscape, *m_attrMarkup, *m_attrFormat;
     typedef NSDictionary* AttrType;
 
-    Attributes()
+    Attributes(wxTextCtrl*)
     {
         m_attrSpace  = @{NSBackgroundColorAttributeName: ColorScheme::Get(Color::SyntaxLeadingWhitespaceBg).OSXGetNSColor()};
         m_attrEscape = @{NSBackgroundColorAttributeName: ColorScheme::Get(Color::SyntaxEscapeBg).OSXGetNSColor(),
@@ -481,10 +481,10 @@ class AnyTranslatableTextCtrl::Attributes
     wxTextAttr m_attrDefault, m_attrSpace, m_attrEscape, m_attrMarkup, m_attrFormat;
     typedef wxTextAttr AttrType;
 
-    Attributes()
+    Attributes(wxTextCtrl *ctrl)
     {
-        m_attrDefault.SetBackgroundColour(*wxWHITE);
-        m_attrDefault.SetTextColour(*wxBLACK);
+        m_attrDefault.SetBackgroundColour(ctrl->GetBackgroundColour());
+        m_attrDefault.SetTextColour(ctrl->GetForegroundColour());
 
         m_attrSpace.SetBackgroundColour(ColorScheme::Get(Color::SyntaxLeadingWhitespaceBg));
 
@@ -514,9 +514,9 @@ class AnyTranslatableTextCtrl::Attributes
 
 
 AnyTranslatableTextCtrl::AnyTranslatableTextCtrl(wxWindow *parent, wxWindowID winid, int style)
-   : CustomizedTextCtrl(parent, winid, style),
-     m_attrs(new Attributes)
+   : CustomizedTextCtrl(parent, winid, style)
 {
+    m_attrs.reset(new Attributes(this));
     Bind(wxEVT_TEXT, [=](wxCommandEvent& e){
         e.Skip();
         HighlightText();

src/welcomescreen.cpp

@@ -25,6 +25,7 @@
 
 #include "welcomescreen.h"
 
+#include "colorscheme.h"
 #include "crowdin_gui.h"
 #include "edapp.h"
 #include "edframe.h"
@@ -165,7 +166,15 @@ WelcomeScreenBase::WelcomeScreenBase(wxWindow *parent)
       m_clrNorm("#444444"),
       m_clrSub("#aaaaaa")
 {
-    SetBackgroundColour(wxColour("#fffcf5"));
+    switch (ColorScheme::GetAppMode())
+    {
+        case ColorScheme::Light:
+            SetBackgroundColour("#fffcf5");
+            break;
+        case ColorScheme::Dark:
+            SetBackgroundColour("#00030a");
+            break;
+    }
 
 #if defined(__WXOSX__)
     auto guiface = wxSystemSettings::GetFont(wxSYS_DEFAULT_GUI_FONT).GetFaceName();