[DiscordArchive] <@160857905879449600> <@100246412050075648> do you guys know if QT handles stuff created on heap aut
[DiscordArchive] <@160857905879449600> <@100246412050075648> do you guys know if QT handles stuff created on heap aut
Original source
<@160857905879449600> <@100246412050075648> do you guys know if QT handles stuff created on heap automatically or I have to manually remove it?
rektbyfaith
06-06-2019, 05:36 PM #1Archived author: Skarn • Posted: 2019-06-06T17:36:47.573000+00:00
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<@160857905879449600> <@100246412050075648> do you guys know if QT handles stuff created on heap automatically or I have to manually remove it?
Original source
I don't see it being removed anywhere
rektbyfaith
06-06-2019, 05:36 PM #2Archived author: Skarn • Posted: 2019-06-06T17:36:52.776000+00:00
Original source
I don't see it being removed anywhere
Original source
but from what I know you need to explicitly delete that stuff to avoid memory leaks
rektbyfaith
06-06-2019, 05:37 PM #3Archived author: Skarn • Posted: 2019-06-06T17:37:02.649000+00:00
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but from what I know you need to explicitly delete that stuff to avoid memory leaks
Original source
That’s what I told you about earlier with the QObject memory model where parents delete all their children when they are deleted
rektbyfaith
06-06-2019, 05:38 PM #4Archived author: schlumpf • Posted: 2019-06-06T17:38:37.382000+00:00
Original source
That’s what I told you about earlier with the QObject memory model where parents delete all their children when they are deleted
Original source
```cpp
void TextureList::mousePressEvent(QMouseEvent* event)
{
QListView::mousePressEvent(event);
if (event->buttons() & Qt::LeftButton) {
int distance = (event->pos() - _start_pos).manhattanLength();
if (distance >= QApplication:
tartDragDistance()){
QModelIndex index = currentIndex();
const std:
tring filename = index.data(Qt:
isplayRole).toString().prepend("tileset/").toStdString();QMimeData* mimeData = new QMimeData;
mimeData->setText(QString(filename.c_str()));
QDrag* drag = new QDrag(this);
drag->setMimeData(mimeData);
drag->exec();
}
}
}
```
rektbyfaith
06-06-2019, 05:38 PM #5Archived author: Skarn • Posted: 2019-06-06T17:38:38.381000+00:00
Original source
```cpp
void TextureList::mousePressEvent(QMouseEvent* event)
{
QListView::mousePressEvent(event);
if (event->buttons() & Qt::LeftButton) {
int distance = (event->pos() - _start_pos).manhattanLength();
if (distance >= QApplication:tartDragDistance())
{
QModelIndex index = currentIndex();
const std:tring filename = index.data(Qt:isplayRole).toString().prepend("tileset/").toStdString();
QMimeData* mimeData = new QMimeData;
mimeData->setText(QString(filename.c_str()));
QDrag* drag = new QDrag(this);
drag->setMimeData(mimeData);
drag->exec();
}
}
}
```
Original source
e.g. is this code leaking or not?
rektbyfaith
06-06-2019, 05:38 PM #6Archived author: Skarn • Posted: 2019-06-06T17:38:49.899000+00:00
Original source
e.g. is this code leaking or not?
Original source
<@160857905879449600> I undertstand the parent - children part. But what about non-widget types?
rektbyfaith
06-06-2019, 05:39 PM #7Archived author: Skarn • Posted: 2019-06-06T17:39:25.333000+00:00
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<@160857905879449600> I undertstand the parent - children part. But what about non-widget types?
Original source
Event: owned by qt.
Mimedata: no parent set until added to drag which takes ownership as documented, so may leak when an exception is thrown between those two lines
Drag: the object passed into the ctor is awkwardly documented but takes ownership.
rektbyfaith
06-06-2019, 05:40 PM #8Archived author: schlumpf • Posted: 2019-06-06T17:40:55.559000+00:00
Original source
Event: owned by qt.
Mimedata: no parent set until added to drag which takes ownership as documented, so may leak when an exception is thrown between those two lines
Drag: the object passed into the ctor is awkwardly documented but takes ownership.
Original source
In an exceptionless world that code does not leak.
rektbyfaith
06-06-2019, 05:41 PM #9Archived author: schlumpf • Posted: 2019-06-06T17:41:12.098000+00:00
Original source
In an exceptionless world that code does not leak.
Original source
QObject is not just widgets
rektbyfaith
06-06-2019, 05:41 PM #10Archived author: schlumpf • Posted: 2019-06-06T17:41:23.851000+00:00
Original source
QObject is not just widgets
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