mayhem-firmware/firmware/application/recent_entries.hpp

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/*
* 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>
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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};
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}
namespace ui {
using RecentEntriesColumn = std::pair<std::string, size_t>;
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class RecentEntriesColumns {
public:
using ContainerType = std::vector<RecentEntriesColumn>;
RecentEntriesColumns(
const std::initializer_list<RecentEntriesColumn> columns);
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ContainerType::const_iterator begin() const { return std::begin(_columns); }
ContainerType::const_iterator end() const { return std::end(_columns); }
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private:
const ContainerType _columns;
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};
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.location(), {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 += {0, 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;
}
}
} else if (event == ui::KeyEvent::Up) {
if (selected_key == recent.front().key()) {
return false;
} else {
advance(-1);
return true;
}
} else if (event == ui::KeyEvent::Down) {
if (selected_key == recent.back().key()) {
return false;
} else {
advance(1);
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 focus() override {
_table.focus();
}
private:
RecentEntriesHeader _header;
RecentEntriesTable<Entries> _table;
};
} /* namespace ui */
#endif /*__RECENT_ENTRIES_H__*/