Start working on UI customization. Allow user to change global backgr…

…ound/foreground colors. Some work still required to update all components' colors

Update issue 219
Started!

src/core/appearance.cpp

@@ -0,0 +1,79 @@
+/* This file is part of Clementine.
+   Copyright 2012, David Sansome <me@davidsansome.com>
+
+   Clementine is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   Clementine 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with Clementine.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "appearance.h"
+
+#include <QApplication>
+#include <QSettings>
+
+const char* Appearance::kSettingsGroup = "Appearance";
+const char* Appearance::kUseCustomColorSet = "use-custom-set";
+const char* Appearance::kForegroundColor = "foreground-color";
+const char* Appearance::kBackgroundColor = "background-color";
+
+Appearance::Appearance(QObject* parent)
+  : QObject(parent)
+{
+  QSettings s;
+  s.beginGroup(kSettingsGroup);
+  QPalette p = QApplication::palette();
+  background_color_ = s.value(kBackgroundColor,
+                              p.color(QPalette::WindowText)).value<QColor>();
+  foreground_color_ = s.value(kForegroundColor,
+                              p.color(QPalette::Window)).value<QColor>();
+}
+
+void Appearance::LoadUserTheme() {
+  QSettings s;
+  s.beginGroup(kSettingsGroup);
+  bool use_a_custom_color_set = s.value(kUseCustomColorSet).toBool();
+  if (!use_a_custom_color_set)
+    return;
+
+  ChangeForegroundColor(foreground_color_);
+  ChangeBackgroundColor(background_color_);
+}
+
+void Appearance::ResetToSystemDefaultTheme() {
+  QApplication::setPalette(QPalette());
+}
+
+void Appearance::ChangeForegroundColor(const QColor& color) {
+  // Get the application palette
+  QPalette p = QApplication::palette();
+
+  // Modify the palette
+  p.setColor(QPalette::WindowText, color);
+  p.setColor(QPalette::Text, color);
+
+  // Make the modified palette the new application's palette
+  QApplication::setPalette(p);
+  foreground_color_ = color;
+}
+
+void Appearance::ChangeBackgroundColor(const QColor& color) {
+  // Get the application palette
+  QPalette p = QApplication::palette();
+
+  // Modify the palette
+  p.setColor(QPalette::Window, color);
+  p.setColor(QPalette::Base, color);
+
+  // Make the modified palette the new application's palette
+  QApplication::setPalette(p);
+  background_color_ = color;
+}

src/core/appearance.h

@@ -0,0 +1,43 @@
+/* This file is part of Clementine.
+   Copyright 2012, David Sansome <me@davidsansome.com>
+
+   Clementine is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   Clementine 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with Clementine.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef APPEARANCE_H
+#define APPEARANCE_H
+
+#include <QColor>
+#include <QPalette>
+
+class Appearance : public QObject {
+  public:
+    Appearance(QObject* parent = NULL);
+    // Load the user preferred theme, which could the default system theme or a
+    // custom set of colors that user has chosen
+    void LoadUserTheme();
+    void ResetToSystemDefaultTheme();
+    void ChangeForegroundColor(const QColor& color);
+    void ChangeBackgroundColor(const QColor& color);
+
+    static const char* kSettingsGroup;
+    static const char* kUseCustomColorSet;
+    static const char* kForegroundColor;
+    static const char* kBackgroundColor;
+  private:
+    QColor foreground_color_;
+    QColor background_color_;
+};
+
+#endif // APPEARANCE_H