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commandlinewidget.cpp
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commandlinewidget.cpp
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/** @file commandlinewidget.cpp Widget for command line input.
*
* @authors Copyright © 2013 Jaakko Keränen <jaakko.keranen@iki.fi>
*
* @par License
* GPL: http://www.gnu.org/licenses/gpl.html
*
* <small>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, see:
* http://www.gnu.org/licenses</small>
*/
#include "commandlinewidget.h"
#include <de/String>
#include <de/RectangleRule>
#include <de/shell/TextRootWidget>
#include <de/shell/KeyEvent>
using namespace de;
using namespace de::shell;
struct CommandLineWidget::Instance
{
CommandLineWidget &self;
/**
* Line of text with a cursor.
*/
struct Command
{
String text;
int cursor; ///< Index in range [0...text.size()]
Command() : cursor(0) {}
};
// Command history.
QList<Command> history;
int historyPos;
Instance(CommandLineWidget &cli) : self(cli), historyPos(0)
{
history.append(Command());
}
~Instance() {}
Command &command()
{
DENG2_ASSERT(historyPos >= 0 && historyPos < history.size());
return history[historyPos];
}
Command const &command() const
{
DENG2_ASSERT(historyPos >= 0 && historyPos < history.size());
return history[historyPos];
}
void updateCommandFromEditor()
{
command().text = self.text();
command().cursor = self.cursor();
}
void updateEditor()
{
self.setText(command().text);
self.setCursor(command().cursor);
}
bool navigateHistory(int offset)
{
if((offset < 0 && historyPos >= -offset) ||
(offset > 0 && historyPos < history.size() - offset))
{
// Save the current state.
updateCommandFromEditor();
historyPos += offset;
// Update to the historical state.
updateEditor();
return true;
}
return false;
}
};
CommandLineWidget::CommandLineWidget(de::String const &name)
: TextEditWidget(name), d(new Instance(*this))
{
setPrompt("> ");
}
CommandLineWidget::~CommandLineWidget()
{
delete d;
}
bool CommandLineWidget::handleEvent(Event const *event)
{
// There are only key press events.
DENG2_ASSERT(event->type() == Event::KeyPress);
KeyEvent const *ev = static_cast<KeyEvent const *>(event);
bool eaten = true;
// Control char?
if(ev->text().isEmpty())
{
// Override the editor's normal Enter handling.
if(ev->key() == Qt::Key_Enter)
{
String entered = d->command().text;
// Update the history.
d->updateCommandFromEditor();
if(d->historyPos < d->history.size() - 1)
{
if(d->history.last().text.isEmpty())
{
// Prune an empty entry in the end of history.
d->history.removeLast();
}
// Currently back in the history; duplicate the edited entry.
d->history.append(d->command());
}
// Move on.
d->history.append(Instance::Command());
d->historyPos = d->history.size() - 1;
d->updateEditor();
emit commandEntered(entered);
return true;
}
eaten = TextEditWidget::handleControlKey(ev->key());
if(!eaten)
{
// History navigation.
switch(ev->key())
{
case Qt::Key_Up:
d->navigateHistory(-1);
eaten = true;
break;
case Qt::Key_Down:
d->navigateHistory(+1);
eaten = true;
break;
default:
break;
}
}
return eaten;
}
else
{
return TextEditWidget::handleEvent(event);
}
}