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statistics: implement moving of legend

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Catch mouse move events and move the legend accordingly.
Currently, this is the only item that can be dragged and
therefore there is no need of doing some kind of fancy
interface. Simply keep a pointer to the legend if it is
dragged.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2021-01-13 13:23:41 +01:00 • committed by bstoeger
parent 2b961414d7
commit 1a869833d8
3 changed files with 53 additions and 4 deletions
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50
stats/statsview.cpp
View file

@ -18,7 +18,6 @@
#include <cmath>
#include <QGraphicsScene>
#include <QGraphicsSceneHoverEvent>
#include <QGraphicsSimpleTextItem>
#include <QQuickItem>
#include <QQuickWindow>
@ -35,6 +34,7 @@ StatsView::StatsView(QQuickItem *parent) : QQuickItem(parent),
highlightedSeries(nullptr),
xAxis(nullptr),
yAxis(nullptr),
draggedItem(nullptr),
rootNode(nullptr)
{
setFlag(ItemHasContents, true);
@ -42,6 +42,7 @@ StatsView::StatsView(QQuickItem *parent) : QQuickItem(parent),
connect(&diveListNotifier, &DiveListNotifier::numShownChanged, this, &StatsView::replotIfVisible);
setAcceptHoverEvents(true);
setAcceptedMouseButtons(Qt::LeftButton);
QFont font;
titleFont = QFont(font.family(), font.pointSize(), QFont::Light); // Make configurable
@ -55,6 +56,30 @@ StatsView::~StatsView()
{
}
void StatsView::mousePressEvent(QMouseEvent *event)
{
// Currently, we only support dragging of the legend. If other objects
// should be made draggable, this needs to be generalized.
if (legend) {
QPointF pos = event->localPos();
QRectF rect = legend->getRect();
if (legend->getRect().contains(pos)) {
dragStartMouse = pos;
dragStartItem = rect.topLeft();
draggedItem = legend.get();
grabMouse();
}
}
}
void StatsView::mouseReleaseEvent(QMouseEvent *)
{
if (draggedItem) {
draggedItem = nullptr;
ungrabMouse();
}
}
QSGNode *StatsView::updatePaintNode(QSGNode *oldNode, QQuickItem::UpdatePaintNodeData *)
{
// The QtQuick drawing interface is utterly bizzare with a distinct 1980ies-style memory management.
@ -172,13 +197,33 @@ void StatsView::replotIfVisible()
plot(state);
}
void StatsView::mouseMoveEvent(QMouseEvent *event)
{
if (!draggedItem)
return;
QSizeF sceneSize = size();
if (sceneSize.width() <= 1.0 || sceneSize.height() <= 1.0)
return;
QPointF pos = event->pos() - dragStartMouse + dragStartItem;;
QSizeF itemSize = draggedItem->getRect().size();
double widthHalf = floor(itemSize.width() / 2);
double heightHalf = floor(itemSize.height() / 2);
QSizeF itemSizeHalf(floor(itemSize.width() / 2), floor(itemSize.height() / 2));
QPointF sanitizedPos(std::clamp(pos.x(), -widthHalf, sceneSize.width() - widthHalf - 1.0),
std::clamp(pos.y(), -heightHalf, sceneSize.height() - heightHalf - 1.0));
draggedItem->setPos(sanitizedPos);
update();
}
void StatsView::hoverEnterEvent(QHoverEvent *)
{
}
void StatsView::hoverMoveEvent(QHoverEvent *event)
{
QPointF pos(event->pos());
QPointF pos = event->pos();
for (auto &series: series) {
if (series->hover(pos)) {
if (series.get() != highlightedSeries) {
@ -254,6 +299,7 @@ void StatsView::reset()
{
highlightedSeries = nullptr;
xAxis = yAxis = nullptr;
draggedItem = nullptr;
items.clear(); // non-owning pointers
legend.reset();
series.clear();