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profile: move dragging code from stats to general qt-code

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So far, the only dragable item was the legend in the statistics
code. On the profile, we will have multiple dragable items.

Therefore, move the code up and make it more general. This
took some reorganization. Now, the size of the ChartItem
is saved in the base class. Also, setPos() became a virtual
function.

The dragable items are kept as an unsorted list.
If there will be many of them, this should be changed to
some sort of sorted list (maybe quadtree?).

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2023-06-25 08:56:21 +02:00
parent 13c9218ecf
commit a527415ac9
7 changed files with 114 additions and 65 deletions
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52
qt-quick/chartview.cpp
View file

@ -105,6 +105,8 @@ void ChartView::emergencyShutdown()
// Mark clean and dirty chart items for deletion...
cleanItems.splice(deletedItems);
dirtyItems.splice(deletedItems);
dragableItems.clear();
draggedItem.reset();
// ...and delete them.
freeDeletedChartItems();
@ -134,6 +136,8 @@ void ChartView::addQSGNode(QSGNode *node, size_t z)
void ChartView::registerChartItem(ChartItem &item)
{
cleanItems.append(item);
if (item.dragable)
dragableItems.push_back(&item);
}
void ChartView::registerDirtyChartItem(ChartItem &item)
@ -152,6 +156,14 @@ void ChartView::deleteChartItemInternal(ChartItem &item)
else
cleanItems.remove(item);
deletedItems.append(item);
if (item.dragable) {
// This becomes inefficient if there are many dragable items!
auto it = std::find(dragableItems.begin(), dragableItems.end(), &item);
if (it == dragableItems.end())
fprintf(stderr, "warning: dragable item not found\n");
else
dragableItems.erase(it);
}
}
ChartView::ChartItemList::ChartItemList() : first(nullptr), last(nullptr)
@ -246,3 +258,43 @@ void ChartView::setLayerVisibility(size_t z, bool visible)
if (rootNode && z < rootNode->zNodes.size())
rootNode->zNodes[z]->setVisible(visible);
}
void ChartView::mousePressEvent(QMouseEvent *event)
{
QPointF pos = event->localPos();
for (auto item: dragableItems) {
QRectF rect = item->getRect();
if (rect.contains(pos)) {
dragStartMouse = pos;
dragStartItem = rect.topLeft();
draggedItem = item;
grabMouse();
setKeepMouseGrab(true); // don't allow Qt to steal the grab
event->accept();
return;
}
}
event->ignore();
}
void ChartView::mouseReleaseEvent(QMouseEvent *event)
{
if (draggedItem) {
draggedItem.reset();
ungrabMouse();
event->accept();
}
}
void ChartView::mouseMoveEvent(QMouseEvent *event)
{
if (draggedItem) {
QSizeF sceneSize = size();
if (sceneSize.width() <= 1.0 || sceneSize.height() <= 1.0)
return;
draggedItem->setPos(event->pos() - dragStartMouse + dragStartItem);
update();
}
}