message/call views: ui overhaul

This patch:
- implements QWebEngineView as the view for interactions
- reorganizes the main widget's layout in order to share views
  between in-call and out-of-call messaging views
- fixes behavioral bugs and crashes
- cannot be built with the mingw compiler due to lack of support for
  QWebEngine, and must be built natively with msvc and includes some
  build script modifications
- should be thought of as a new client

Change-Id: I59d8c68dc8384e85fb006f30d8313482c00d6c85
diff --git a/animationhelpers.cpp b/animationhelpers.cpp
new file mode 100644
index 0000000..c2abd8d
--- /dev/null
+++ b/animationhelpers.cpp
@@ -0,0 +1,130 @@
+/***************************************************************************
+ * Copyright (C) 2018 by Savoir-faire Linux                                *
+ * Author: Andreas Traczyk <andreas.traczyk@savoirfairelinux.com>          *
+ *                                                                         *
+ * 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 3 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/>.   *
+ **************************************************************************/
+
+#include "animationhelpers.h"
+
+#include "ui_animatedoverlay.h"
+
+#include <QTimer>
+#include <QtMath>
+
+OpacityAnimation::OpacityAnimation(QWidget* target, QObject* parent)
+    : QObject(parent),
+    target_(target),
+    timer_(nullptr),
+    frameTime_((1.0 / 24.0) * 1000),
+    startValue_(0.0),
+    endValue_(1.0),
+    t_(0),
+    value_(0),
+    duration_(1000)
+{
+    timer_ = new QTimer(this);
+    connect(timer_, SIGNAL(timeout()), this, SLOT(updateAnimation()));
+
+    effect_ = new QGraphicsOpacityEffect(this);
+    effect_->setOpacity(startValue_);
+
+    target_->setGraphicsEffect(effect_);
+    target_->setAutoFillBackground(true);
+}
+
+OpacityAnimation::~OpacityAnimation()
+{
+}
+
+void
+OpacityAnimation::setFPS(const int& fps)
+{
+    frameTime_ = (1.0 / static_cast<double>(fps)) * 1000;
+}
+
+void
+OpacityAnimation::setFrameTime(const int& milliseconds)
+{
+    frameTime_ = milliseconds;
+}
+
+void
+OpacityAnimation::setDuration(const int& milliseconds)
+{
+    duration_ = milliseconds;
+}
+
+void
+OpacityAnimation::setStartValue(const double& value)
+{
+    startValue_ = value;
+    effect_->setOpacity(startValue_);
+}
+
+void
+OpacityAnimation::setEndValue(const double& value)
+{
+    endValue_ = value;
+}
+
+void
+OpacityAnimation::start()
+{
+    timer_->start(frameTime_);
+}
+
+void
+OpacityAnimation::stop()
+{
+    timer_->stop();
+}
+
+void
+OpacityAnimation::updateAnimation()
+{
+    double d = (startValue_ + endValue_) * 0.5;
+    double a = abs(startValue_ - endValue_) * 0.5;
+
+    t_ += frameTime_;
+    value_ = a * sin(2 * M_PI * t_ * duration_ * .000001) + d;
+    effect_->setOpacity(value_);
+    target_->update();
+}
+
+AnimatedOverlay::AnimatedOverlay(QColor color, QWidget* parent) :
+    QWidget(parent),
+    ui(new Ui::AnimatedOverlay)
+{
+    ui->setupUi(this);
+    ui->backgroundLabel->setAutoFillBackground(true);
+    auto values = QString("%1,%2,%3,255")
+        .arg(color.red())
+        .arg(color.green())
+        .arg(color.blue());
+    ui->backgroundLabel->setStyleSheet("background-color: rgba(" + values + ");");
+
+    oa_ = new OpacityAnimation(this, this);
+    oa_->setFPS(16);
+    oa_->setDuration(1000);
+    oa_->setStartValue(0.0);
+    oa_->setEndValue(0.25);
+    oa_->start();
+}
+
+AnimatedOverlay::~AnimatedOverlay()
+{
+    disconnect(this);
+    delete ui;
+}