// Copyright 2005-2019 The Mumble Developers. All rights reserved.
// Use of this source code is governed by a BSD-style license
// that can be found in the LICENSE file at the root of the
// Mumble source tree or at <https://www.mumble.info/LICENSE>.

// See scripts/generate-ApplicationPalette-class.py

%(warning)s

#ifndef APPLICATIONPALETTE_H
#define APPLICATIONPALETTE_H

#include <QWidget>
#include <QTimer>
#ifndef Q_MOC_RUN
#include <boost/optional.hpp>
#endif
#include <QApplication>
#include <QDebug>

///
/// Class enabling theming of QApplication::palette from stylesheets.
/// 
/// QPalette cannot be styled which creates issues as not all
/// GUI elements in Qt can be styled. This class works around
/// that by offering a QPROPERTY for each color role and group
/// combination in QPalette. As you can set custom QPROPERTYs
/// from stylesheet this allows the user to set all relevant
/// palette brushes from the stylesheet.
/// 
/// Due to restrictions on allowed property names as well as a
/// mandatory prefix the attributes are exposed as lower cased:
/// "qproperty-<role>_<group>".
/// 
/// So a group of QPalette::Active and QPalette::Text role
/// would be styled by:
/// 
/// ApplicationPalette {
///     qproperty-text_active: #ff0000; /* Set color for active group */
/// }
///
/// See http://qt-project.org/doc/qt-4.8/qpalette.html#ColorGroup-enum
/// for the available groups and roles.
///
/// You can also use the shorthand "qproperty-<role>" to set all groups
/// to the same brush.
/// 
/// The class will automatically pick up style changes on itself
/// and update the application palette accordingly. To use the class
/// simply instantiate it before setting the theme and keep it around
/// till the application terminates.
/// 
class ApplicationPalette : public QWidget
{
		Q_OBJECT
%(properties)s
	public:
		explicit ApplicationPalette(QWidget *p = 0)
		  : QWidget(p)
		  , m_originalPalette(QApplication::palette()){
			// Empty
		}
		
%(getterssetters)s
		
	private slots:
		void updateApplicationPalette() {
			qWarning() << "Updating application palette";
			
			QPalette newPalette = m_originalPalette; // Do not re-use potentially already styled palette. Might not pick up system style changes though.

%(paletteupdates)s

			QApplication::setPalette(newPalette);
			resetAllProperties();
		}
		
		void resetAllProperties() {
%(propertyresets)s
		}

	protected:
		bool event(QEvent *e) Q_DECL_OVERRIDE {
			bool result = QWidget::event(e);
			
			if (e->type() == QEvent::StyleChange) {
				// Update global palette. Have to defer it
				// as property updates are also signals.
				QTimer::singleShot(0, this, SLOT(updateApplicationPalette()));
			}
			
			return result;
		}
	private:
		const QPalette m_originalPalette;
		
%(variables)s
};

#endif // APPLICATIONPALETTE_H
