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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
* layout.h
*
* Sat Mar 21 15:12:36 CET 2015
* Copyright 2015 Bent Bisballe Nyeng
* deva@aasimon.org
****************************************************************************/
/*
* This file is part of DrumGizmo.
*
* DrumGizmo is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* DrumGizmo 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with DrumGizmo; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#pragma once
#include <cstdlib>
#include <list>
#include <unordered_map>
#include <notifier.h>
namespace GUI
{
class Layout;
class LayoutItem
{
public:
LayoutItem();
virtual ~LayoutItem();
void setLayoutParent(Layout* parent);
virtual void resize(std::size_t width, std::size_t height) = 0;
virtual void move(int x, int y) = 0;
virtual int x() const = 0;
virtual int y() const = 0;
virtual std::size_t width() const = 0;
virtual std::size_t height() const = 0;
private:
Layout* parent;
};
//! \brief Abtract Layout class.
class Layout : public Listener
{
public:
Layout(LayoutItem* parent);
virtual ~Layout()
{
}
virtual void addItem(LayoutItem* item);
virtual void removeItem(LayoutItem* item);
//! \brief Reimplement this method to create a new Layout rule.
virtual void layout() = 0;
protected:
void sizeChanged(int width, int height);
LayoutItem* parent;
typedef std::list<LayoutItem*> LayoutItemList;
LayoutItemList items;
};
//! \brief Abstract box layout
class BoxLayout : public Layout
{
public:
BoxLayout(LayoutItem* parent);
//! \brief Set to false to only move the items, not scale them.
void setResizeChildren(bool resize_children);
void setSpacing(size_t spacing);
// From Layout:
virtual void layout() override = 0;
protected:
bool resizeChildren{false};
size_t spacing{0};
};
enum class HAlignment
{
left,
center,
right,
};
//! \brief A Layout that lays out its elements vertically.
class VBoxLayout : public BoxLayout
{
public:
VBoxLayout(LayoutItem* parent);
void setHAlignment(HAlignment alignment);
// From BoxLayout:
virtual void layout() override;
protected:
HAlignment align;
};
enum class VAlignment
{
top,
center,
bottom,
};
//! \brief A Layout that lays out its elements vertically.
class HBoxLayout : public BoxLayout
{
public:
HBoxLayout(LayoutItem* parent);
void setVAlignment(VAlignment alignment);
// From BoxLayout:
virtual void layout() override;
protected:
VAlignment align;
};
//! \brief A Layout class which places the items in a regular grid. An item can
//! span multiple rows/columns.
class GridLayout : public BoxLayout
{
public:
// The range is open, i.e. end is one past the last one.
struct GridRange
{
int column_begin;
int column_end;
int row_begin;
int row_end;
};
GridLayout(LayoutItem* parent, std::size_t number_of_columns,
std::size_t number_of_rows);
virtual ~GridLayout()
{
}
// From Layout:
virtual void removeItem(LayoutItem* item);
virtual void layout();
void setPosition(LayoutItem* item, GridRange const& range);
int lastUsedRow(int column) const;
int lastUsedColumn(int row) const;
protected:
std::size_t number_of_columns;
std::size_t number_of_rows;
// Note: Yes, this is somewhat redundant to the LayoutItemList of the Layout
// class. However, this was the best idea I had such that I could still
// derive from Layout. If you find this ugly, feel free to fix it.
std::unordered_map<LayoutItem*, GridRange> grid_ranges;
private:
struct CellSize {
std::size_t width;
std::size_t height;
};
CellSize calculateCellSize() const;
void moveAndResize(
LayoutItem& item, GridRange const& range, CellSize cell_size) const;
};
} // GUI::
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