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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 <string>
#include <sstream>
#include <iostream>
#include <QScrollBar>
#include "conversation.h"
#include "debate.h"
namespace OpenAxiom {
// -- Question --
Question::Question(Exchange& e) : QLineEdit(&e) { }
// -- Answer --
Answer::Answer(Exchange& e) : QLabel(&e) { }
// -- Exchange --
// Amount of pixel spacing between the query and reply areas.
const int spacing = 0;
// Margin around query and reply areas.
const int margin = 2;
QSize Exchange::sizeHint() const {
QSize sz = question()->frameSize();
sz.rwidth() += 2 * margin;
sz.rheight() += answer()->frameSize().height() + spacing + 2 * margin;
return sz;
}
QSize Exchange::minimumSizeHint() const {
QSize sz = question()->frameSize();
sz.rwidth() += 2 * margin;
if (not answer()->isHidden())
sz.rheight() += answer()->frameSize().height() + spacing;
sz.rheight() += 2 * margin;
return sz;
}
// Return a monospace font
QFont
monospace_font() {
QFont f("Courier");
f.setStyleHint(QFont::TypeWriter);
return f;
}
// Measurement in pixel of the em unit in the given font metrics.
static QSize
em_metrics(const QFontMetrics& fm) {
return QSize(fm.width(QLatin1Char('m')), fm.height());
}
// Measurement in pixel of the em unit in the given font `f'.
QSize em_metrics(const QFont& f) {
return em_metrics(QFontMetrics(f));
}
// Dress the query area with initial properties.
static void
prepare_query_widget(QLineEdit* w) {
w->setFrame(false);
w->setFont(monospace_font());
QSize em = em_metrics(w->fontMetrics());
w->setGeometry(margin, margin,
question_columns * em.width(), em.height());
}
// Dress the reply aread with initial properties.
static void
prepare_reply_widget(QLabel* w, const QRect& below) {
w->setFont(monospace_font());
w->setGeometry(below.x(), below.height() + spacing,
below.width(), 2 * w->fontMetrics().height());
w->hide(); // nothing to show yet
}
// -- Exchange --
Exchange::Exchange(Conversation& conv, int n)
: QFrame(&conv), no(n), query(*this), reply(*this) {
// 1. Construct the query area.
prepare_query_widget(question());
// 2. Construct the response area.
prepare_reply_widget(answer(), question()->geometry());
// 3. Construct the whole frame
QSize qs = question()->frameSize();
QSize rs = answer()->frameSize();
resize(qs.width() + 2 * margin, qs.height() + rs.height() + 2 * margin);
setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred);
setLineWidth(1);
// 4.
connect(&query, SIGNAL(returnPressed()),
this, SLOT(reply_to_query()));
}
static QString
parenthesize(int n) {
std::ostringstream os;
os << '(' << n << ')';
return QString::fromStdString(os.str());
}
Conversation* Exchange::conversation() {
return &dynamic_cast<Conversation&>(*parentWidget());
}
Debate* Exchange::debate() {
return conversation()->debate();
}
void
Exchange::reply_to_query() {
QString input = question()->text().trimmed();
if (input.isEmpty())
return;
QString ans = parenthesize(number()) + " " + input;
answer()->show();
answer()->setText(ans);
debate()->ensureWidgetVisible(answer());
debate()->horizontalScrollBar()->setValue(0);
conversation()->next(this)->question()
->setFocus(Qt::OtherFocusReason);
}
// ------------------
// -- Conversation --
// -------------------
static void resize_if_necessary(Conversation& conv) {
QSize sz = conv.sizeHint();
if (sz.height() > conv.height())
conv.resize(conv.width(), sz.height());
}
static void debug_engine(Conversation& conv) {
std::cerr << "# conversations: " << conv.length()
<< std::endl;
QSize sz = conv.sizeHint();
std::cerr << "size: " << sz.width() << ", " << sz.height()
<< std::endl;
}
Conversation::Conversation(Debate& parent)
: QWidget(&parent), group(parent) {
setSizePolicy(QSizePolicy::Preferred, QSizePolicy::MinimumExpanding);
QSize sz = new_topic()->frameSize();
setMinimumSize(sz.width(), 10 * sz.height());
}
Conversation::~Conversation() {
for (int i = children.size() -1 ; i >= 0; --i)
delete children[i];
}
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();
}
return sz;
}
Exchange*
Conversation::new_topic() {
QPoint loc(0,0);
if (not fresh()) {
Exchange* last = children.back();
loc = last->geometry().bottomLeft();
}
Exchange* w = new Exchange(*this, length() + 1);
w->setVisible(true);
w->move(loc);
children.push_back(w);
resize_if_necessary(*this);
debug_engine(*this);
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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