ViewWidget: Added mouse_down

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

diff --git a/pv/view/viewwidget.cpp b/pv/view/viewwidget.cpp
index 9c4c56ff6f0e50d20f1ec3839ee9b4b8ebbc6f30..e2b2d17295f3295bc429f550548d95545c3ca1f3 100644 (file)
--- a/pv/view/viewwidget.cpp
+++ b/pv/view/viewwidget.cpp
@@ -18,10 +18,10 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  */
 
-#include <algorithm>
+#include <QApplication>
+#include <QMouseEvent>
 
 #include "rowitem.hpp"
-#include "timeitem.hpp"
 #include "view.hpp"
 #include "viewwidget.hpp"
 
@@ -34,8 +34,24 @@ namespace view {
 
 ViewWidget::ViewWidget(View &parent) :
        QWidget(&parent),
-       view_(parent)
+       view_(parent),
+       item_dragging_(false)
 {
+       setFocusPolicy(Qt::ClickFocus);
+       setMouseTracking(true);
+}
+
+void ViewWidget::clear_selection()
+{
+       const auto items = this->items();
+       for (auto &i : items)
+               i->select(false);
+       update();
+}
+
+void ViewWidget::item_clicked(const shared_ptr<ViewItem> &item)
+{
+       (void)item;
 }
 
 bool ViewWidget::accept_drag() const
@@ -70,6 +86,12 @@ bool ViewWidget::accept_drag() const
        return false;
 }
 
+bool ViewWidget::mouse_down() const
+{
+       return mouse_down_point_.x() != INT_MIN &&
+               mouse_down_point_.y() != INT_MIN;
+}
+
 void ViewWidget::drag_items(const QPoint &delta)
 {
        // Drag the row items
@@ -96,5 +118,116 @@ void ViewWidget::drag_items(const QPoint &delta)
                        i->drag_by(delta);
 }
 
+void ViewWidget::mouse_left_press_event(QMouseEvent *event)
+{
+       (void)event;
+
+       const bool ctrl_pressed =
+               QApplication::keyboardModifiers() & Qt::ControlModifier;
+
+       // Clear selection if control is not pressed and this item is unselected
+       if ((!mouse_down_item_ || !mouse_down_item_->selected()) &&
+               !ctrl_pressed)
+               clear_selection();
+
+       // Set the signal selection state if the item has been clicked
+       if (mouse_down_item_) {
+               if (ctrl_pressed)
+                       mouse_down_item_->select(!mouse_down_item_->selected());
+               else
+                       mouse_down_item_->select(true);
+       }
+
+       // Save the offsets of any signals which will be dragged
+       const auto items = this->items();
+       for (auto &i : items)
+               if (i->selected())
+                       i->drag();
+
+       selection_changed();
+       update();
+}
+
+void ViewWidget::mouse_left_release_event(QMouseEvent *event)
+{
+       assert(event);
+
+       auto items = this->items();
+       const bool ctrl_pressed =
+               QApplication::keyboardModifiers() & Qt::ControlModifier;
+
+       // Unselect everything if control is not pressed
+       const shared_ptr<ViewItem> mouse_over =
+               get_mouse_over_item(event->pos());
+
+       for (auto &i : items)
+               i->drag_release();
+
+       if (item_dragging_)
+               view_.restack_all_row_items();
+       else
+       {
+               if (!ctrl_pressed) {
+                       for (shared_ptr<ViewItem> i : items)
+                               if (mouse_down_item_ != i)
+                                       i->select(false);
+
+                       if (mouse_down_item_)
+                               item_clicked(mouse_down_item_);
+               }
+       }
+
+       item_dragging_ = false;
+}
+
+void ViewWidget::mousePressEvent(QMouseEvent *event)
+{
+       assert(event);
+
+       mouse_down_point_ = event->pos();
+       mouse_down_item_ = get_mouse_over_item(event->pos());
+
+       if (event->button() & Qt::LeftButton)
+               mouse_left_press_event(event);
+}
+
+void ViewWidget::mouseReleaseEvent(QMouseEvent *event)
+{
+       assert(event);
+       if (event->button() & Qt::LeftButton)
+               mouse_left_release_event(event);
+
+       mouse_down_point_ = QPoint(INT_MIN, INT_MIN);
+       mouse_down_item_ = nullptr;
+}
+
+void ViewWidget::mouseMoveEvent(QMouseEvent *event)
+{
+       assert(event);
+       mouse_point_ = event->pos();
+
+       if (!(event->buttons() & Qt::LeftButton))
+               return;
+
+       if ((event->pos() - mouse_down_point_).manhattanLength() <
+               QApplication::startDragDistance())
+               return;
+
+       if (!accept_drag())
+               return;
+
+       // Do the drag
+       item_dragging_ = true;
+       drag_items(event->pos() - mouse_down_point_);
+
+       update();
+}
+
+void ViewWidget::leaveEvent(QEvent*)
+{
+       mouse_point_ = QPoint(-1, -1);
+       update();
+}
+
 } // namespace view
 } // namespace pv