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dialogwidget.cpp
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dialogwidget.cpp
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/** @file dialogwidget.cpp Base class for modal dialogs.
*
* @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 "de/shell/DialogWidget"
#include "de/shell/TextRootWidget"
#include "de/shell/KeyEvent"
#include <QEventLoop>
namespace de {
namespace shell {
struct DialogWidget::Instance
{
QEventLoop subloop;
};
DialogWidget::DialogWidget(String const &name)
: TextWidget(name), d(new Instance)
{
// Dialogs are hidden until executed.
hide();
}
DialogWidget::~DialogWidget()
{
delete d;
}
void DialogWidget::prepare()
{
show();
root().setFocus(this);
redraw();
}
void DialogWidget::finish(int /*result*/)
{
hide();
root().setFocus(0);
}
int DialogWidget::exec(TextRootWidget &root)
{
// The widget is added to the root temporarily (as top child).
DENG2_ASSERT(!hasRoot());
root.add(this);
// Center the dialog.
rule().setInput(RuleRectangle::Left, (root.viewWidth() - rule().width()) / 2)
.setInput(RuleRectangle::Top, (root.viewHeight() - rule().height()) / 2);
prepare();
int result = d->subloop.exec();
finish(result);
// No longer in the root.
root.remove(*this);
root.requestDraw();
return result;
}
void DialogWidget::draw()
{
Rectanglei pos = rule().recti().adjusted(Vector2i(-2, -1), Vector2i(2, 1));
// Draw a background frame.
targetCanvas().fill(pos, TextCanvas::Char());
targetCanvas().drawLineRect(pos);
}
bool DialogWidget::handleEvent(Event const *event)
{
if(event->type() == Event::KeyPress)
{
KeyEvent const *ev = static_cast<KeyEvent const *>(event);
if(ev->key() == Qt::Key_Escape)
{
reject();
return true;
}
}
// All events not handled by children are eaten by the dialog.
return true;
}
void DialogWidget::accept(int result)
{
if(d->subloop.isRunning())
{
d->subloop.exit(result);
emit accepted(result);
}
}
void DialogWidget::reject(int result)
{
if(d->subloop.isRunning())
{
d->subloop.exit(result);
emit rejected(result);
}
}
} // namespace shell
} // namespace de