apply settings:

src/dlangide/ui/frame.d

@@ -113,6 +113,7 @@ class IDEFrame : AppFrame {
         _settings.updateDefaults();
         _settings.save();
         super.init();
+        applySettings(_settings);
     }
 
     /// move focus to editor in currently selected tab
@@ -182,7 +183,7 @@ class IDEFrame : AppFrame {
                 TabItem tab = _tabs.tab(filename);
                 tab.objectParam = file;
                 editor.onModifiedStateChangeListener = &onModifiedStateChange;
-                editor.settings(settings).applySettings();
+                applySettings(editor, settings);
                 _tabs.selectTab(index, true);
             } else {
                 destroy(editor);
@@ -641,12 +642,32 @@ class IDEFrame : AppFrame {
 			if (result.id == ACTION_APPLY.id) {
                 //Log.d("settings after edit:\n", s.toJSON(true));
                 _settings.applySettings(s);
+                applySettings(_settings);
                 _settings.save();
             }
         };
         dlg.show();
     }
 
+    void applySettings(IDESettings settings) {
+        for (int i = _tabs.tabCount - 1; i >= 0; i--) {
+            DSourceEdit ed = cast(DSourceEdit)_tabs.tabBody(i);
+            if (ed) {
+                applySettings(ed, settings);
+            }
+        }
+        FontManager.fontGamma = settings.fontGamma;
+        FontManager.hintingMode = settings.hintingMode;
+        FontManager.minAnitialiasedFontSize = settings.minAntialiasedFontSize;
+	    Platform.instance.uiLanguage = settings.uiLanguage;
+	    Platform.instance.uiTheme = settings.uiTheme;
+        requestLayout();
+    }
+
+    void applySettings(DSourceEdit editor, IDESettings settings) {
+        editor.settings(settings).applySettings();
+    }
+
     private bool loadProject(Project project) {
         if (!project.load()) {
             _logPanel.logLine("Cannot read project " ~ project.filename);

src/dlangide/ui/settings.d

@@ -2,6 +2,7 @@ module dlangide.ui.settings;
 
 import dlangui.core.settings;
 import dlangui.core.i18n;
+import dlangui.graphics.fonts;
 import dlangui.widgets.lists;
 import dlangui.dialogs.settingsdialog;
 
@@ -25,6 +26,7 @@ class IDESettings : SettingsFile {
         ui.setStringDef("theme", "theme_default");
         ui.setStringDef("language", "en");
         ui.setIntegerDef("hintingMode", 1);
+        ui.setIntegerDef("minAntialiasedFontSize", 0);
         ui.setFloatingDef("fontGamma", 0.8);
     }
 
@@ -107,6 +109,28 @@ class IDESettings : SettingsFile {
     @property bool smartIndentsAfterPaste() { return editorSettings.getBoolean("smartIndentsAfterPaste", true); }
     /// set smart indents enabled flag
     @property IDESettings smartIndentsAfterPaste(bool enabled) { editorSettings.setBoolean("smartIndentsAfterPaste", enabled); return this; }
+
+    @property double fontGamma() {
+        double gamma = uiSettings.getFloating("fontGamma", 1.0);
+        if (gamma >= 0.5 && gamma <= 2.0)
+            return gamma;
+        return 1.0;
+    }
+
+    @property HintingMode hintingMode() {
+        long mode = uiSettings.getInteger("hintingMode", HintingMode.Normal);
+        if (mode >= HintingMode.Normal && mode <= HintingMode.Light)
+            return cast(HintingMode)mode;
+        return HintingMode.Normal;
+    }
+
+    @property int minAntialiasedFontSize() {
+        long sz = uiSettings.getInteger("minAntialiasedFontSize", 0);
+        if (sz >= 0)
+            return cast(int)sz;
+        return 0;
+    }
+
 }
 
 /// create DlangIDE settings pages tree
@@ -123,6 +147,16 @@ SettingsPage createSettingsPages() {
     ui.addStringComboBox("interface/language", UIString("Language"d), [StringListValue("en", "English"d), StringListValue("ru", "Russian"d)]);
     ui.addIntComboBox("interface/hintingMode", UIString("Font hinting mode"d), [StringListValue(0, "Normal"d), StringListValue(1, "Force Auto Hint"d), 
                 StringListValue(2, "Disabled"d), StringListValue(3, "Light"d)]);
+    ui.addIntComboBox("interface/minAntialiasedFontSize", UIString("Minimum font size for antialiasing"d), 
+                      [StringListValue(0, "Always ON"d), 
+                      StringListValue(12, "12"d), 
+                      StringListValue(14, "14"d), 
+                      StringListValue(16, "16"d), 
+                      StringListValue(20, "20"d), 
+                      StringListValue(24, "24"d), 
+                      StringListValue(32, "32"d), 
+                      StringListValue(48, "48"d), 
+                      StringListValue(255, "Always OFF"d)]);
     ui.addFloatComboBox("interface/fontGamma", UIString("Font gamma"d), 
                    [
                     StringListValue(500,  "0.5   "d),