Details
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Bug
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Resolution: Done
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P2: Important
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5.12.0 Beta 1
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None
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Windows 10; Version 1803
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Windows
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29ea287716175b57aa7b050b70eb3eb5c9049464 (qt/qtbase/5.12.1)
Description
Widgets created with QWidget::createWindowContainer and put into a QMdiArea jumps erratically around when dragging them around on top of other similar widgets. This gets worse the more windows that there are in the QMdiArea.
Steps to reproduce:
- Create a QMdiArea and put multiple (8+) QQuickView or Qt3DWindow windows into the mdi area using createWindowContainer and addSubWindow.
- Click the title bar of one of the windows and hold the mouse down.
- Start moving the mouse to drag the window around.
- Drag the window around on top of other widgets.
Result: The dragged window jumps around when dragging; if releasing the mouse at an unlucky time the window will appear at a random location or somewhere off screen.
This is an issue in the 5.12.0 alpha and beta 1. The issue is not present in 5.11.2.
I can reproduce it with the following code (both with the Qt3D windows and Qml windows):
#include <QApplication>
#include <QMainWindow>
#include <QMdiArea>
#include <QMdiSubWindow>
#include <QQuickView>
#include <QWidget>
#include <Qt3DWindow>
void add3DWindow(QMdiArea *mdiArea) {
auto *window = new Qt3DExtras::Qt3DWindow();
auto *widget = QWidget::createWindowContainer(window);
auto *mdiWindow = mdiArea->addSubWindow(widget);
mdiWindow->resize(500, 500);
}
void addQmlWindow(QMdiArea *mdiArea) {
QQuickView *window = new QQuickView();
auto *widget = QWidget::createWindowContainer(window);
auto *mdiWindow = mdiArea->addSubWindow(widget);
mdiWindow->resize(500, 500);
}
void addMdiArea(QMainWindow *window) {
auto *mdiArea = new QMdiArea(window);
window->setCentralWidget(mdiArea);
auto addWindow = [&] { addQmlWindow(mdiArea); };
addWindow();
addWindow();
addWindow();
addWindow();
addWindow();
addWindow();
addWindow();
addWindow();
addWindow();
}
int main(int argc, char *argv[]) {
QApplication app(argc, argv);
QMainWindow window;
addMdiArea(&window);
window.showMaximized();
return app.exec();
}
And with this build file:
TARGET = mditest
TEMPLATE = app
CONFIG += c++11
QT += \
core \
gui \
widgets \
3dextras \
quick
SOURCES += \
main.cpp
Attachments
Issue Links
- resulted from
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- Closed
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| For Gerrit Dashboard: QTBUG-70974 | ||||||
|---|---|---|---|---|---|---|
| # | Subject | Branch | Project | Status | CR | V |
| 248104,1 | QMdiSubWindow: Fix sporadic movement of subwindows containing QWindow's | 5.12 | qt/qtbase | Status: ABANDONED | -1 | 0 |
| 248186,6 | Windows QPA: Avoid duplication of mouse events | 5.12.1 | qt/qtbase | Status: MERGED | -2 | 0 |