lmms/include/ControlLayout.h

/*
 * ControlLayout.h - layout for controls
 *
 * Copyright (c) 2019-2019 Johannes Lorenz <j.git$$$lorenz-ho.me, $$$=@>
 *
 * This file is part of LMMS - https://lmms.io
 *
 * This program 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 2 of the License, or (at your option) any later version.
 *
 * This program 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 this program (see COPYING); if not, write to the
 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301 USA.
 *
 */

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#ifndef LMMS_GUI_CONTROL_LAYOUT_H
#define LMMS_GUI_CONTROL_LAYOUT_H

#include <QLayout>
#include <QMultiMap>
#include <QStyle>

class QLayoutItem;
class QRect;
class QString;
class QLineEdit;


namespace lmms::gui
{

/**
	Layout for controls (models)

	Originally token from Qt's FlowLayout example. Modified.

	Features a search bar, as well as looking up widgets with string keys
	Keys have to be provided in the widgets' objectNames
*/
class ControlLayout : public QLayout
{
	Q_OBJECT

public:
	explicit ControlLayout(QWidget *parent,
		int margin = -1, int hSpacing = -1, int vSpacing = -1);
	~ControlLayout() override;

	void addItem(QLayoutItem *item) override;
	int horizontalSpacing() const;
	int verticalSpacing() const;
	Qt::Orientations expandingDirections() const override;
	bool hasHeightForWidth() const override;
	int heightForWidth(int) const override;
	int count() const override;
	QLayoutItem *itemAt(int index) const override;
	QLayoutItem *itemByString(const QString& key) const;
	QSize minimumSize() const override;
	void setGeometry(const QRect &rect) override;
	QSize sizeHint() const override;
	QLayoutItem *takeAt(int index) override;
	//! remove focus from QLineEdit search bar
	//! this may be useful if the mouse is outside the layout
	void removeFocusFromSearchBar();

private slots:
	void onTextChanged(const QString&);

private:
	int doLayout(const QRect &rect, bool testOnly) const;
	int smartSpacing(QStyle::PixelMetric pm) const;
	QMap<QString, QLayoutItem *>::const_iterator pairAt(int index) const;

	QMultiMap<QString, QLayoutItem *> m_itemMap;
	int m_hSpace;
	int m_vSpace;
	// relevant dimension is width, as later, heightForWidth() will be called
	// 400 looks good and is ~4 knobs in a row
	constexpr const static int m_minWidth = 400;
	QLineEdit* m_searchBar;
	//! name of search bar, must be ASCII sorted before any alpha numerics
	static constexpr const char* s_searchBarName = "!!searchBar!!";
};

} // namespace lmms::gui

#endif // LMMS_GUI_CONTROL_LAYOUT_H