portapack-mayhem/firmware/application/recent_entries.hpp
2016-09-05 16:49:44 -07:00

279 lines
6.7 KiB
C++

/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* 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, 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 the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __RECENT_ENTRIES_H__
#define __RECENT_ENTRIES_H__
#include "ui_widget.hpp"
#include "ui_font_fixed_8x16.hpp"
#include <cstddef>
#include <cstdint>
#include <list>
#include <utility>
#include <functional>
#include <iterator>
#include <algorithm>
template<class Entry>
using RecentEntries = std::list<Entry>;
template<typename ContainerType, typename Key>
typename ContainerType::const_iterator find(const ContainerType& entries, const Key key) {
return std::find_if(
std::begin(entries), std::end(entries),
[key](typename ContainerType::const_reference e) { return e.key() == key; }
);
}
template<typename ContainerType>
static void truncate_entries(ContainerType& entries, const size_t entries_max = 64) {
while(entries.size() > entries_max) {
entries.pop_back();
}
}
template<typename ContainerType, typename Key>
typename ContainerType::reference on_packet(ContainerType& entries, const Key key) {
auto matching_recent = find(entries, key);
if( matching_recent != std::end(entries) ) {
// Found within. Move to front of list, increment counter.
entries.push_front(*matching_recent);
entries.erase(matching_recent);
} else {
entries.emplace_front(key);
truncate_entries(entries);
}
return entries.front();
}
template<typename ContainerType>
static std::pair<typename ContainerType::const_iterator, typename ContainerType::const_iterator> range_around(
const ContainerType& entries,
typename ContainerType::const_iterator item,
const size_t count
) {
auto start = item;
auto end = item;
size_t i = 0;
// Move start iterator toward first entry.
while( (start != std::begin(entries)) && (i < count / 2) ) {
std::advance(start, -1);
i++;
}
// Move end iterator toward last entry.
while( (end != std::end(entries)) && (i < count) ) {
std::advance(end, 1);
i++;
}
return { start, end };
}
namespace ui {
using RecentEntriesColumn = std::pair<std::string, size_t>;
class RecentEntriesColumns {
public:
using ContainerType = std::vector<RecentEntriesColumn>;
RecentEntriesColumns(
const std::initializer_list<RecentEntriesColumn> columns
);
ContainerType::const_iterator begin() const { return std::begin(_columns); }
ContainerType::const_iterator end() const { return std::end(_columns); }
private:
const ContainerType _columns;
};
class RecentEntriesHeader : public Widget {
public:
RecentEntriesHeader(
const RecentEntriesColumns& columns
);
void paint(Painter& painter) override;
private:
const RecentEntriesColumns& _columns;
};
template<class Entries>
class RecentEntriesTable : public Widget {
public:
using Entry = typename Entries::value_type;
std::function<void(const Entry& entry)> on_select;
RecentEntriesTable(
Entries& recent
) : recent { recent }
{
set_focusable(true);
}
void paint(Painter& painter) override {
const auto r = screen_rect();
const auto& s = style();
Rect target_rect { r.pos, { r.width(), s.font.line_height() }};
const size_t visible_item_count = r.height() / s.font.line_height();
auto selected = find(recent, selected_key);
if( selected == std::end(recent) ) {
selected = std::begin(recent);
}
auto range = range_around(recent, selected, visible_item_count);
for(auto p = range.first; p != range.second; p++) {
const auto& entry = *p;
const auto is_selected_key = (selected_key == entry.key());
const auto item_style = (has_focus() && is_selected_key) ? s.invert() : s;
draw(entry, target_rect, painter, item_style);
target_rect.pos.y += target_rect.height();
}
painter.fill_rectangle(
{ target_rect.left(), target_rect.top(), target_rect.width(), r.bottom() - target_rect.top() },
style().background
);
}
bool on_encoder(const EncoderEvent event) override {
advance(event);
return true;
}
bool on_key(const ui::KeyEvent event) override {
if( event == ui::KeyEvent::Select ) {
if( on_select ) {
const auto selected = find(recent, selected_key);
if( selected != std::end(recent) ) {
on_select(*selected);
return true;
}
}
}
return false;
}
void on_focus() override {
advance(0);
}
private:
Entries& recent;
using EntryKey = typename Entry::Key;
EntryKey selected_key = Entry::invalid_key;
void advance(const int32_t amount) {
auto selected = find(recent, selected_key);
if( selected == std::end(recent) ) {
if( recent.empty() ) {
selected_key = Entry::invalid_key;
} else {
selected_key = recent.front().key();
}
} else {
if( amount < 0 ) {
if( selected != std::begin(recent) ) {
std::advance(selected, -1);
}
}
if( amount > 0 ) {
std::advance(selected, 1);
if( selected == std::end(recent) ) {
return;
}
}
selected_key = selected->key();
}
set_dirty();
}
void draw(
const Entry& entry,
const Rect& target_rect,
Painter& painter,
const Style& style
);
};
template<class Entries>
class RecentEntriesView : public View {
public:
using Entry = typename Entries::value_type;
std::function<void(const Entry& entry)> on_select;
RecentEntriesView(
const RecentEntriesColumns& columns,
Entries& recent
) : _header { columns },
_table { recent }
{
add_children({
&_header,
&_table,
});
_table.on_select = [this](const Entry& entry) { if( this->on_select ) { this->on_select(entry); } };
}
void set_parent_rect(const Rect new_parent_rect) override {
constexpr Dim scale_height = 16;
View::set_parent_rect(new_parent_rect);
_header.set_parent_rect({ 0, 0, new_parent_rect.width(), scale_height });
_table.set_parent_rect({
0, scale_height,
new_parent_rect.width(),
new_parent_rect.height() - scale_height
});
}
void paint(Painter&) override {
// Children completely cover this View, do not paint.
// TODO: What happens here shouldn't matter if I do proper damage detection!
}
void on_focus() override {
_table.focus();
}
private:
RecentEntriesHeader _header;
RecentEntriesTable<Entries> _table;
};
} /* namespace ui */
#endif/*__RECENT_ENTRIES_H__*/