Added support for Twitch's Chat Replies (#3722)

Co-authored-by: Rasmus Karlsson <rasmus.karlsson@pajlada.com>

src/widgets/DraggablePopup.cpp

@@ -0,0 +1,90 @@
+#include "DraggablePopup.hpp"
+
+#include <QMouseEvent>
+
+#include <chrono>
+
+namespace chatterino {
+
+namespace {
+
+#ifdef Q_OS_LINUX
+    FlagsEnum<BaseWindow::Flags> popupFlags{BaseWindow::Dialog,
+                                            BaseWindow::EnableCustomFrame};
+    FlagsEnum<BaseWindow::Flags> popupFlagsCloseAutomatically{
+        BaseWindow::EnableCustomFrame};
+#else
+    FlagsEnum<BaseWindow::Flags> popupFlags{BaseWindow::EnableCustomFrame};
+    FlagsEnum<BaseWindow::Flags> popupFlagsCloseAutomatically{
+        BaseWindow::EnableCustomFrame, BaseWindow::Frameless,
+        BaseWindow::FramelessDraggable};
+#endif
+
+}  // namespace
+
+DraggablePopup::DraggablePopup(bool closeAutomatically, QWidget *parent)
+    : BaseWindow(closeAutomatically ? popupFlagsCloseAutomatically : popupFlags,
+                 parent)
+    , lifetimeHack_(std::make_shared<bool>(false))
+    , dragTimer_(this)
+
+{
+    if (closeAutomatically)
+    {
+        this->setActionOnFocusLoss(BaseWindow::Delete);
+    }
+    else
+    {
+        this->setAttribute(Qt::WA_DeleteOnClose);
+    }
+
+    // Update the window position according to this->requestedDragPos_ on every trigger
+    this->dragTimer_.callOnTimeout(
+        [this, hack = std::weak_ptr<bool>(this->lifetimeHack_)] {
+            if (!hack.lock())
+            {
+                // Ensure this timer is never called after the object has been destroyed
+                return;
+            }
+
+            if (!this->isMoving_)
+            {
+                return;
+            }
+
+            this->move(this->requestedDragPos_);
+        });
+}
+
+void DraggablePopup::mousePressEvent(QMouseEvent *event)
+{
+    if (event->button() == Qt::MouseButton::LeftButton)
+    {
+        this->dragTimer_.start(std::chrono::milliseconds(17));
+        this->startPosDrag_ = event->pos();
+        this->movingRelativePos = event->localPos();
+    }
+}
+
+void DraggablePopup::mouseReleaseEvent(QMouseEvent *event)
+{
+    this->dragTimer_.stop();
+    this->isMoving_ = false;
+}
+
+void DraggablePopup::mouseMoveEvent(QMouseEvent *event)
+{
+    // Drag the window by the amount changed from inital position
+    // Note that we provide a few *units* of deadzone so people don't
+    // start dragging the window if they are slow at clicking.
+
+    auto movePos = event->pos() - this->startPosDrag_;
+    if (this->isMoving_ || movePos.manhattanLength() > 10.0)
+    {
+        this->requestedDragPos_ =
+            (event->screenPos() - this->movingRelativePos).toPoint();
+        this->isMoving_ = true;
+    }
+}
+
+}  // namespace chatterino