Handle panning touch gestures (#5524)

2024-07-28 05:02:20 -05:00
parent ff7cc09f8b
commit 5fc4309e0e
3 changed files with 72 additions and 0 deletions
@@ -54,6 +54,7 @@
 #include <QDebug>
 #include <QDesktopServices>
 #include <QEasingCurve>
+#include <QGestureEvent>
 #include <QGraphicsBlurEffect>
 #include <QJsonDocument>
 #include <QMessageBox>
@@ -369,6 +370,8 @@ ChannelView::ChannelView(InternalCtor /*tag*/, QWidget *parent, Split *split,
        this->scrollUpdateRequested();
    });

+    this->grabGesture(Qt::PanGesture);
+
    // TODO: Figure out if we need this, and if so, why
    // StrongFocus means we can focus this event through clicking it
    // and tabbing to it from another widget. I don't currently know
@@ -1786,8 +1789,71 @@ void ChannelView::leaveEvent(QEvent * /*event*/)
    this->unpause(PauseReason::Mouse);
 }

+bool ChannelView::event(QEvent *event)
+{
+    if (event->type() == QEvent::Gesture)
+    {
+        if (const auto *gestureEvent = dynamic_cast<QGestureEvent *>(event))
+        {
+            return this->gestureEvent(gestureEvent);
+        }
+    }
+
+    return BaseWidget::event(event);
+}
+
+bool ChannelView::gestureEvent(const QGestureEvent *event)
+{
+    if (QGesture *pan = event->gesture(Qt::PanGesture))
+    {
+        if (const auto *gesture = dynamic_cast<QPanGesture *>(pan))
+        {
+            switch (gesture->state())
+            {
+                case Qt::GestureStarted: {
+                    this->isPanning_ = true;
+                    // Remove any selections and hide tooltip while panning
+                    this->clearSelection();
+                    this->tooltipWidget_->hide();
+                    if (this->isScrolling_)
+                    {
+                        this->disableScrolling();
+                    }
+                }
+                break;
+
+                case Qt::GestureUpdated: {
+                    if (this->scrollBar_->isVisible())
+                    {
+                        this->scrollBar_->offset(-gesture->delta().y() * 0.1);
+                    }
+                }
+                break;
+
+                case Qt::GestureFinished:
+                case Qt::GestureCanceled:
+                default: {
+                    this->clearSelection();
+                    this->isPanning_ = false;
+                }
+                break;
+            }
+
+            return true;
+        }
+    }
+
+    return false;
+}
+
 void ChannelView::mouseMoveEvent(QMouseEvent *event)
 {
+    if (this->isPanning_)
+    {
+        // Don't do any text selection, hovering, etc while panning
+        return;
+    }
+
    /// Pause on hover
    if (float pauseTime = getSettings()->pauseOnHoverDuration;
        pauseTime > 0.001F)