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cursesfe.cc
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cursesfe.cc
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/*
* xmms2_jump: Quickly search your XMMS2 playlist.
* Copyright (C) 2007 David Scott Reiss
*
* 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; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stdexcept>
#include <string>
#include <utility>
#include <vector>
#include <tr1/unordered_map>
#include <iostream>
#include <boost/lexical_cast.hpp>
#include <signal.h>
#include <curses.h>
#include "common.h"
#include "frontend.h"
using std::string;
using std::pair;
using std::vector;
using std::tr1::unordered_map;
using boost::lexical_cast;
static void sigint(int sig) {
sig = sig;
(void) endwin();
std::exit(EXIT_SUCCESS);
}
class CursesGui : public Frontend
{
public:
CursesGui()
: cursor_pos_(0)
, select_offset_(0)
, screen_offset_(0)
{}
virtual void AddEntry(int position, strref name);
virtual void Display();
private:
void InitCurses();
void SetListSize();
void AdjustNames();
void UpdateCount();
void DisplayNames();
static const int header_size = 2;
unordered_map<int,string> names_;
vector<int> const* survivors_;
string list_size_;
int cursor_pos_;
int select_offset_;
int screen_offset_;
};
void CursesGui::AddEntry(int position, strref name) {
names_[position] = name;
}
void CursesGui::Display() {
survivors_ = &(Search(""));
if (survivors_->size() != names_.size())
throw std::runtime_error("Size mismatch.");
InitCurses();
SetListSize();
AdjustNames();
while (true) {
UpdateCount();
DisplayNames();
// TODO: Avoid full DisplayNames when we just move the selection.
// Unfortunately, it is so darn fast as is that I'm not motivated.
int c = mvgetch(0, cursor_pos_);
//endwin();
//std::cerr << c << std::endl;
//return;
if ( c < 0x100 && std::isprint(c)) {
cursor_pos_++;
addch(c);
survivors_ = &(AddChar((char)c));
select_offset_ = 0;
screen_offset_ = 0;
continue;
}
switch (c) {
case KEY_BACKSPACE:
case KEY_DC:
case 0x7f:
if (cursor_pos_ > 0) {
cursor_pos_--;
move(0, cursor_pos_);
delch();
survivors_ = &(PopChar());
select_offset_ = 0;
screen_offset_ = 0;
}
break;
case KEY_DOWN:
select_offset_++;
if (select_offset_ >= (int)survivors_->size())
select_offset_ = survivors_->size() - 1;
if (select_offset_ - screen_offset_ >= LINES - header_size)
screen_offset_++;
break;
case KEY_UP:
select_offset_--;
if (select_offset_ < 0)
select_offset_ = 0;
if (select_offset_ < screen_offset_)
screen_offset_--;
break;
case KEY_NPAGE /* Page Down*/ :
select_offset_ += LINES - header_size - 1;
if (select_offset_ >= (int)survivors_->size())
select_offset_ = survivors_->size() - 1;
if (select_offset_ - screen_offset_ >= LINES - header_size)
screen_offset_ = select_offset_ - LINES + header_size + 1;
break;
case KEY_PPAGE /* Page Up */:
select_offset_ -= LINES - header_size - 1;
if (select_offset_ < 0)
select_offset_ = 0;
if (select_offset_ < screen_offset_)
screen_offset_ = select_offset_;
break;
case KEY_ENTER:
case '\r':
case '\n':
endwin();
ItemSelected(survivors_->at(select_offset_));
return;
case '\033' /* ESC */:
endwin();
return;
}
}
}
void CursesGui::InitCurses() {
(void) signal(SIGINT, sigint); /* arrange interrupts to terminate */
(void) initscr(); /* initialize the curses library */
(void) keypad(stdscr, TRUE); /* enable keyboard mapping */
(void) nonl(); /* don't do do NL->CR/NL on output */
(void) cbreak(); /* don't wait for \n */
(void) noecho(); /* do not echo input */
string dashes(COLS, '-');
mvaddstr(1, 0, dashes.c_str());
}
void CursesGui::SetListSize() {
list_size_ = lexical_cast<string>(names_.size());
}
void CursesGui::AdjustNames() {
int max_len = lexical_cast<string>(names_.size()).length();
for ( unordered_map<int,string>::iterator it = names_.begin() ;
it != names_.end() ; ++it ) {
string pos = lexical_cast<string>(it->first);
string spaces(max_len - pos.length(), ' ');
string prefix = spaces + pos + ' ';
if (COLS - prefix.length() < it->second.length())
it->second.erase(COLS - prefix.length());
it->second.replace(0, 0, prefix);
while (it->second.length() < (string::size_type)COLS)
it->second += ' ';
}
}
void CursesGui::UpdateCount() {
string surv = lexical_cast<string>(survivors_->size());
string dashes(list_size_.length() - surv.length() + 3, '-');
string display = dashes + ' ' + surv + '/' + list_size_ + ' ';
mvaddstr(1, 0, display.c_str());
}
void CursesGui::DisplayNames() {
int yoff = 0;
assert(screen_offset_ <= (int)survivors_->size());
// Skip over everything that is scrolled offscreen.
for ( vector<int>::const_iterator it = survivors_->begin()
+ screen_offset_ ; it != survivors_->end() ; ++it ) {
if (yoff + header_size == LINES) break;
if (yoff == select_offset_ - screen_offset_) standout();
mvaddstr(yoff + header_size, 0, names_[*it].c_str());
if (yoff == select_offset_ - screen_offset_) standend();
++yoff;
}
if (yoff + header_size != LINES) {
move(yoff + header_size, 0);
clrtobot();
}
}
Frontend* Frontend::get() {
return new CursesGui();
}