devicetoolbutton.cpp

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/*
 * This file is part of the PulseView project.
 *
 * Copyright (C) 2015 Joel Holdsworth <joel@airwebreathe.org.uk>
 *
 * 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 St, Fifth Floor, Boston, MA  02110-1301 USA
 */

#include <cassert>

#include <QTimer>
#include <QToolTip>

#include <libsigrokcxx/libsigrokcxx.hpp>

#include <pv/devicemanager.hpp>
#include <pv/devices/device.hpp>

#include "devicetoolbutton.hpp"

using std::list;
using std::shared_ptr;
using std::string;
using std::weak_ptr;
using std::vector;

using pv::devices::Device;

namespace pv {
namespace widgets {

DeviceToolButton::DeviceToolButton(QWidget *parent,
    DeviceManager &device_manager,
    QAction *connect_action) :
    QToolButton(parent),
    device_manager_(device_manager),
    connect_action_(connect_action),
    menu_(this),
    mapper_(this),
    devices_()
{
    setPopupMode(QToolButton::MenuButtonPopup);
    setMenu(&menu_);
    setDefaultAction(connect_action_);
    setMinimumWidth(QFontMetrics(font()).averageCharWidth() * 24);

    connect(&mapper_, SIGNAL(mapped(QObject*)),
        this, SLOT(on_action(QObject*)));

    connect(&menu_, SIGNAL(hovered(QAction*)),
        this, SLOT(on_menu_hovered(QAction*)));
}

shared_ptr<Device> DeviceToolButton::selected_device()
{
    return selected_device_;
}

void DeviceToolButton::set_device_list(
    const list< shared_ptr<Device> > &devices, shared_ptr<Device> selected)
{
    selected_device_ = selected;
    setText(selected ? QString::fromStdString(
        selected->display_name(device_manager_)) : "<No Device>");
    devices_ = vector< weak_ptr<Device> >(devices.begin(), devices.end());
    update_device_list();
}

void DeviceToolButton::update_device_list()
{
    menu_.clear();
    menu_.addAction(connect_action_);
    menu_.setDefaultAction(connect_action_);
    menu_.addSeparator();

    for (weak_ptr<Device> dev_weak_ptr : devices_) {
        shared_ptr<Device> dev(dev_weak_ptr.lock());
        if (!dev)
            continue;

        QAction *const a = new QAction(QString::fromStdString(
            dev->display_name(device_manager_)), this);
        a->setCheckable(true);
        a->setChecked(selected_device_ == dev);
        a->setData(qVariantFromValue((void*)dev.get()));
        a->setToolTip(QString::fromStdString(dev->full_name()));
        mapper_.setMapping(a, a);

        connect(a, SIGNAL(triggered()), &mapper_, SLOT(map()));

        menu_.addAction(a);
    }
}

void DeviceToolButton::on_action(QObject *action)
{
    assert(action);

    Device *const dev = (Device*)((QAction*)action)->data().value<void*>();
    for (weak_ptr<Device> dev_weak_ptr : devices_) {
        shared_ptr<Device> dev_ptr(dev_weak_ptr);
        if (dev_ptr.get() == dev) {
            selected_device_ = shared_ptr<Device>(dev_ptr);
            break;
        }
    }

    update_device_list();
    setText(QString::fromStdString(
        selected_device_->display_name(device_manager_)));

    device_selected();
}

void DeviceToolButton::on_menu_hovered(QAction *action)
{
    assert(action);

    // Only show the tooltip for device entries (they hold
    // device pointers in their data field)
    if (!action->data().isValid())
        return;

    device_tooltip_ = action->toolTip();

    if (QToolTip::isVisible())
        on_menu_hover_timeout();
    else
        QTimer::singleShot(1000, this, SLOT(on_menu_hover_timeout()));
}

void DeviceToolButton::on_menu_hover_timeout()
{
    if (device_tooltip_.isEmpty())
        return;

    QToolTip::showText(QCursor::pos(), device_tooltip_);
}

} // widgets
} // pv