add failsafe theme (#381)

RedPandaIDE/mainwindow.cpp

@@ -999,8 +999,23 @@ void MainWindow::applySettings()
         themeManager.prepareCustomeTheme();
     }
     themeManager.setUseCustomTheme(pSettings->environment().useCustomTheme());
+    PAppTheme appTheme;
     try {
-        PAppTheme appTheme = themeManager.theme(pSettings->environment().theme());
+        appTheme = themeManager.theme(pSettings->environment().theme());
+    } catch (FileError e) {
+        QMessageBox::critical(this,
+                              tr("Load Theme Error"),
+                              e.reason());
+        appTheme = AppTheme::fallbackTheme();
+    }
+#ifdef ENABLE_LUA_ADDON
+    catch (AddOn::LuaError e) {
+        QMessageBox::critical(this,
+                              tr("Load Theme Error"),
+                              e.reason());
+        appTheme = AppTheme::fallbackTheme();
+    }
+#endif
     const QString& style = appTheme->style();
     if (style == "RedPandaDarkFusion")
         QApplication::setStyle(new DarkFusionStyle());//app takes the onwership
@@ -1013,18 +1028,6 @@ void MainWindow::applySettings()
     mFileEncodingStatus->setPalette(appTheme->palette());
     mFileModeStatus->setPalette(appTheme->palette());
     mFileInfoStatus->setPalette(appTheme->palette());
-    } catch (FileError e) {
-        QMessageBox::critical(this,
-                              tr("Load Theme Error"),
-                              e.reason());
-    }
-#ifdef ENABLE_LUA_ADDON
-    catch (AddOn::LuaError e) {
-        QMessageBox::critical(this,
-                              tr("Load Theme Error"),
-                              e.reason());
-    }
-#endif
 
     updateEditorColorSchemes();
 

RedPandaIDE/thememanager.cpp

@@ -119,6 +119,8 @@ QList<PAppTheme> ThemeManager::getThemes()
     std::sort(result.begin(),result.end(),[](const PAppTheme &theme1, const PAppTheme &theme2){
         return QFileInfo(theme1->filename()).baseName() <  QFileInfo(theme2->filename()).baseName();
     });
+    if (result.isEmpty())
+        result.append(AppTheme::fallbackTheme());
     return result;
 }
 
@@ -347,3 +349,18 @@ const QString &AppTheme::style() const
 {
     return mStyle;
 }
+
+AppTheme::AppTheme() :
+    mName("__failsafe__theme__"),
+    mDisplayName("Fusion [fail-safe hard-coded]"),
+    mStyle("fusion"),
+    mDefaultColorScheme("Adaptive"),
+    mDefaultIconSet("newlook")
+{
+}
+
+PAppTheme AppTheme::fallbackTheme()
+{
+    static PAppTheme theme = PAppTheme(new AppTheme());
+    return theme;
+}

RedPandaIDE/thememanager.h

@@ -22,6 +22,9 @@
 #include <memory>
 #include <QObject>
 
+class AppTheme;
+using PAppTheme = std::shared_ptr<AppTheme>;
+
 class AppTheme : public QObject{
     Q_OBJECT
 public:
@@ -102,6 +105,12 @@ public:
 
     const QString& filename() const;
 
+public:
+    static PAppTheme fallbackTheme();
+
+private:
+    AppTheme();
+
 private:
     static QPalette initialPalette();
 private:
@@ -114,8 +123,6 @@ private:
     QString mFilename;
 };
 
-using PAppTheme = std::shared_ptr<AppTheme>;
-
 class ThemeManager : public QObject
 {
     Q_OBJECT