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// Copyright (C) 2011, Gabriel Dos Reis.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// - Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// - Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in
// the documentation and/or other materials provided with the
// distribution.
//
// - Neither the name of OpenAxiom. nor the names of its contributors
// may be used to endorse or promote products derived from this
// software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
// IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
// PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
// OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include <cmath>
#include <string>
#include <sstream>
#include <iostream>
#include <QScrollBar>
#include "conversation.h"
#include "debate.h"
namespace OpenAxiom {
static void debug_size(const char* s, const QSize& sz) {
std::cerr << s << " == "
<< sz.width() << ", " << sz.height() << std::endl;
}
// Measurement in pixel of the em unit in the given font `f'.
static QSize em_metrics(const QWidget* w) {
const QFontMetrics fm = w->fontMetrics();
return QSize(fm.width(QLatin1Char('m')), fm.height());
}
// -- Question --
Question::Question(Exchange& e) : Base(&e), parent(&e) { }
void Question::enterEvent(QEvent* e) {
Base::enterEvent(e);
setFocus(Qt::OtherFocusReason);
}
// -- Answer --
Answer::Answer(Exchange& e) : Base(&e), parent(&e) {
setReadOnly(true);
}
// -- Exchange --
// Amount of pixel spacing between the query and reply areas.
const int spacing = 0;
// Return a monospace font
static QFont monospace_font() {
QFont f("Courier");
f.setStyleHint(QFont::TypeWriter);
return f;
}
static int margin(const Exchange*e) {
return 2 + e->lineWidth();
}
// The layout within an exchange is as follows:
// -- input area (an editor) with its own decoation accounted for.
// -- an optional spacing
// -- an output area with its own decoration accounted for.
QSize Exchange::sizeHint() const {
QSize sz = question()->frameSize();
if (not answer()->isHidden())
sz.rheight() += answer()->frameSize().height() + spacing;
return sz;
}
// Dress the query area with initial properties.
static void
prepare_query_widget(Conversation& conv, Exchange* e) {
Question* q = e->question();
q->setFrame(false);
q->setFont(conv.font());
const int m = margin(e);
q->setGeometry(m, m, conv.width(), q->height());
}
// Dress the reply aread with initial properties.
// Place the reply widget right below the frame containing
// the query widget; make both of the same width, of course.
static void
prepare_reply_widget(Exchange* e) {
Answer* a = e->answer();
Question* q = e->question();
const QPoint pt = e->question()->frameGeometry().bottomLeft();
a->setGeometry(pt.x(), pt.y() + spacing, q->width(), q->height());
a->setBackgroundRole(q->backgroundRole());
a->hide(); // nothing to show yet
}
static void
finish_exchange_make_up(Conversation& conv, Exchange* e) {
e->setAutoFillBackground(true);
e->setBackgroundRole(e->question()->backgroundRole());
QPoint pt = conv.bottom_left();
const QSize sz = e->sizeHint();
e->setGeometry(pt.x(), pt.y(), sz.width(), sz.height());
}
Exchange::Exchange(Conversation& conv, int n)
: QFrame(&conv), parent(&conv), no(n), query(*this), reply(*this) {
setLineWidth(1);
setFont(conv.font());
prepare_query_widget(conv, this);
prepare_reply_widget(this);
finish_exchange_make_up(conv, this);
connect(question(), SIGNAL(returnPressed()),
this, SLOT(reply_to_query()));
}
static QString
parenthesize(int n) {
std::ostringstream os;
os << '(' << n << ')';
return QString::fromStdString(os.str());
}
static void ensure_visibility(Debate* debate, Exchange* e) {
const int y = e->frameGeometry().bottomLeft().y();
QScrollBar* vbar = debate->verticalScrollBar();
const int value = vbar->value();
int new_value = y - vbar->pageStep();
if (y < value)
vbar->setValue(std::max(new_value, 0));
else if (new_value > value)
vbar->setValue(std::min(new_value, vbar->maximum()));
e->question()->setFocus(Qt::OtherFocusReason);
}
void
Exchange::reply_to_query() {
QString input = question()->text().trimmed();
if (input.isEmpty())
return;
QString ans = parenthesize(number()) + " " + input;
answer()->show();
answer()->setText(ans);
adjustSize();
update();
updateGeometry();
ensure_visibility(conversation()->debate(), conversation()->next(this));
}
void Exchange::resizeEvent(QResizeEvent* e) {
QFrame::resizeEvent(e);
const int w = width() - 2 * margin(this);
if (w > question()->width()) {
question()->resize(w, question()->height());
answer()->resize(w, answer()->height());
}
}
// ------------------
// -- Conversation --
// -------------------
// Default number of characters per question line.
const int columns = 80;
const int lines = 25;
static QSize
minimum_preferred_size(const Conversation* conv) {
const QSize em = em_metrics(conv);
return QSize(columns * em.width(), 2 * lines * em.height());
}
// Set a minimum preferred widget size, so no layout manager
// messes with it. Indicate we can make use of more space.
Conversation::Conversation(Debate& parent) : group(parent) {
setFont(monospace_font());
setMinimumSize(minimum_preferred_size(this));
setSizePolicy(QSizePolicy::MinimumExpanding,
QSizePolicy::MinimumExpanding);
}
Conversation::~Conversation() {
for (int i = children.size() -1 ; i >= 0; --i)
delete children[i];
}
QPoint Conversation::bottom_left() const {
if (length() == 0)
return QPoint(0, 0);
return children.back()->geometry().bottomLeft();
}
QSize Conversation::sizeHint() const {
QSize sz(0,0);
for (int i = 0; i < length(); ++i) {
QSize s = children[i]->sizeHint();
if (s.width() > sz.width())
sz.setWidth(s.width());
sz.rheight() += s.height();
}
int view_height = debate()->viewport()->height();
if (view_height == 0)
view_height = 2 * lines * em_metrics(this).height();
const int n = (sz.height() + view_height) / view_height;
return QSize(sz.width(), n * view_height);
}
void Conversation::resizeEvent(QResizeEvent* e) {
std::cerr << "-- Conversation::resizeEvent --" << std::endl;
debug_size("viewport.size", debate()->viewport()->size());
debug_size("conv.size", size());
const QSize sz = size();
if (e->oldSize() == sz)
return;
for (int i = 0; i < length(); ++i) {
Exchange* e = children[i];
e->resize(sz.width(), e->height());
}
}
void Conversation::paintEvent(QPaintEvent* e) {
QWidget::paintEvent(e);
if (length() == 0)
new_topic();
}
Exchange*
Conversation::new_topic() {
Exchange* w = new Exchange(*this, length() + 1);
w->show();
children.push_back(w);
adjustSize();
update();
debate()->updateGeometry();
return w;
}
Exchange*
Conversation::next(Exchange* w) {
if (w == 0 or w->number() == length())
return new_topic();
return children[w->number()];
}
}
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