Viewport: Implemented item hover cursors

[pulseview.git] / pv / view / viewport.cpp

diff --git a/pv/view/viewport.cpp b/pv/view/viewport.cpp
index 83df7aa4d1eaaa9543add3896e2b6363457ba200..2dfdddc1448bddecd8653918c63204ca63dd266c 100644 (file)
--- a/pv/view/viewport.cpp
+++ b/pv/view/viewport.cpp
@@ -21,6 +21,7 @@
 #include <cassert>
 #include <cmath>
 #include <algorithm>
+#include <limits>
 
 #include "signal.hpp"
 #include "view.hpp"
@@ -34,9 +35,11 @@
 using std::abs;
 using std::back_inserter;
 using std::copy;
+using std::dynamic_pointer_cast;
 using std::max;
 using std::min;
 using std::none_of;
+using std::numeric_limits;
 using std::shared_ptr;
 using std::stable_sort;
 using std::vector;
@@ -46,11 +49,9 @@ namespace view {
 
 Viewport::Viewport(View &parent) :
        ViewWidget(parent),
-       mouse_down_valid_(false),
+       drag_offset_(numeric_limits<double>::signaling_NaN()),
        pinch_zoom_active_(false)
 {
-       setAttribute(Qt::WA_AcceptTouchEvents, true);
-
        setAutoFillBackground(true);
        setBackgroundRole(QPalette::Base);
 }
@@ -65,6 +66,34 @@ shared_ptr<ViewItem> Viewport::get_mouse_over_item(const QPoint &pt)
        return nullptr;
 }
 
+void Viewport::item_hover(const shared_ptr<ViewItem> &item)
+{
+       if (item)
+               setCursor(dynamic_pointer_cast<RowItem>(item) ?
+                       Qt::SizeVerCursor : Qt::SizeHorCursor);
+       else
+               unsetCursor();
+}
+
+void Viewport::drag()
+{
+       drag_offset_ = view_.offset();
+}
+
+void Viewport::drag_by(const QPoint &delta)
+{
+       if (isnan(drag_offset_))
+               return;
+
+       view_.set_scale_offset(view_.scale(), drag_offset_ -
+               delta.x() * view_.scale());
+}
+
+void Viewport::drag_release()
+{
+       drag_offset_ = numeric_limits<double>::signaling_NaN();
+}
+
 vector< shared_ptr<ViewItem> > Viewport::items()
 {
        vector< shared_ptr<ViewItem> > items(view_.begin(), view_.end());
@@ -73,6 +102,51 @@ vector< shared_ptr<ViewItem> > Viewport::items()
        return items;
 }
 
+bool Viewport::touch_event(QTouchEvent *event)
+{
+       QList<QTouchEvent::TouchPoint> touchPoints = event->touchPoints();
+
+       if (touchPoints.count() != 2) {
+               pinch_zoom_active_ = false;
+               return false;
+       }
+
+       const QTouchEvent::TouchPoint &touchPoint0 = touchPoints.first();
+       const QTouchEvent::TouchPoint &touchPoint1 = touchPoints.last();
+
+       if (!pinch_zoom_active_ ||
+           (event->touchPointStates() & Qt::TouchPointPressed)) {
+               pinch_offset0_ = view_.offset() + view_.scale() * touchPoint0.pos().x();
+               pinch_offset1_ = view_.offset() + view_.scale() * touchPoint1.pos().x();
+               pinch_zoom_active_ = true;
+       }
+
+       double w = touchPoint1.pos().x() - touchPoint0.pos().x();
+       if (abs(w) >= 1.0) {
+               const double scale =
+                       fabs((pinch_offset1_ - pinch_offset0_) / w);
+               double offset = pinch_offset0_ - touchPoint0.pos().x() * scale;
+               if (scale > 0)
+                       view_.set_scale_offset(scale, offset);
+       }
+
+       if (event->touchPointStates() & Qt::TouchPointReleased) {
+               pinch_zoom_active_ = false;
+
+               if (touchPoint0.state() & Qt::TouchPointReleased) {
+                       // Primary touch released
+                       drag_release();
+               } else {
+                       // Update the mouse down fields so that continued
+                       // dragging with the primary touch will work correctly
+                       mouse_down_point_ = touchPoint0.pos().toPoint();
+                       drag();
+               }
+       }
+
+       return true;
+}
+
 void Viewport::paintEvent(QPaintEvent*)
 {
        vector< shared_ptr<RowItem> > row_items(view_.begin(), view_.end());
@@ -110,60 +184,6 @@ void Viewport::paintEvent(QPaintEvent*)
        p.end();
 }
 
-bool Viewport::event(QEvent *event)
-{
-       switch (event->type()) {
-       case QEvent::TouchBegin:
-       case QEvent::TouchUpdate:
-       case QEvent::TouchEnd:
-               if (touchEvent(static_cast<QTouchEvent *>(event)))
-                       return true;
-               break;
-
-       default:
-               break;
-       }
-
-       return QWidget::event(event);
-}
-
-void Viewport::mousePressEvent(QMouseEvent *event)
-{
-       assert(event);
-
-       if (event->button() == Qt::LeftButton) {
-               mouse_down_point_ = event->pos();
-               mouse_down_offset_ = view_.offset();
-               mouse_down_valid_ = true;
-       }
-}
-
-void Viewport::mouseReleaseEvent(QMouseEvent *event)
-{
-       assert(event);
-
-       if (event->button() == Qt::LeftButton)
-               mouse_down_valid_ = false;
-}
-
-void Viewport::mouseMoveEvent(QMouseEvent *event)
-{
-       assert(event);
-
-       if (event->buttons() & Qt::LeftButton) {
-               if (!mouse_down_valid_) {
-                       mouse_down_point_ = event->pos();
-                       mouse_down_offset_ = view_.offset();
-                       mouse_down_valid_ = true;
-               }
-
-               view_.set_scale_offset(view_.scale(),
-                       mouse_down_offset_ +
-                       (mouse_down_point_ - event->pos()).x() *
-                       view_.scale());
-       }
-}
-
 void Viewport::mouseDoubleClickEvent(QMouseEvent *event)
 {
        assert(event);
@@ -189,52 +209,5 @@ void Viewport::wheelEvent(QWheelEvent *event)
        }
 }
 
-bool Viewport::touchEvent(QTouchEvent *event)
-{
-       QList<QTouchEvent::TouchPoint> touchPoints = event->touchPoints();
-
-       if (touchPoints.count() != 2) {
-               pinch_zoom_active_ = false;
-               return false;
-       }
-
-       const QTouchEvent::TouchPoint &touchPoint0 = touchPoints.first();
-       const QTouchEvent::TouchPoint &touchPoint1 = touchPoints.last();
-
-       if (!pinch_zoom_active_ ||
-           (event->touchPointStates() & Qt::TouchPointPressed)) {
-               pinch_offset0_ = view_.offset() + view_.scale() * touchPoint0.pos().x();
-               pinch_offset1_ = view_.offset() + view_.scale() * touchPoint1.pos().x();
-               pinch_zoom_active_ = true;
-       }
-
-       double w = touchPoint1.pos().x() - touchPoint0.pos().x();
-       if (abs(w) >= 1.0) {
-               double scale = (pinch_offset1_ - pinch_offset0_) / w;
-               if (scale < 0)
-                       scale = -scale;
-               double offset = pinch_offset0_ - touchPoint0.pos().x() * scale;
-               if (scale > 0)
-                       view_.set_scale_offset(scale, offset);
-       }
-
-       if (event->touchPointStates() & Qt::TouchPointReleased) {
-               pinch_zoom_active_ = false;
-
-               if (touchPoint0.state() & Qt::TouchPointReleased) {
-                       // Primary touch released
-                       mouse_down_valid_ = false;
-               } else {
-                       // Update the mouse down fields so that continued
-                       // dragging with the primary touch will work correctly
-                       mouse_down_point_ = touchPoint0.pos().toPoint();
-                       mouse_down_offset_ = view_.offset();
-                       mouse_down_valid_ = true;
-               }
-       }
-
-       return true;
-}
-
 } // namespace view
 } // namespace pv