CODEWITHSUNDEEP
qtqwidgetmouse-cursor
dashesy
dashesy

Reputation: 2645

Set consistent mouse cursor for QWidget

I have sub-classed QWidget to draw on it using mouse. I use setCursor to change its cursor to cross shape. It is working fine but as soon as I press the mouse button on it (for example to draw freehand line), the cursor changes back to application cursor. Note that I do not want to use setOverrideCursor on mouseenter event for example because I want to change cursor only for this widget and not for entire application, and I have a better workaround (as follows) anyways.

My current solution is to use setCursor(cursor()); in my overridden mousePressEvent(QMouseEvent * event) and mouseDoubleClickEvent(QMouseEvent * event) The latter is because for some reason double click also changes the cursor to the application cursor for a moment! The workaround works :) but I would like to see if there is any better solution, that asks QT not to change the cursor at all.

I should add that drag/drop is not activated.

Here is some source code snippet as requested:

class MyWidget : public QWidget
{
    void paintEvent( QPaintEvent * /*event*/ );
    void resizeEvent( QResizeEvent * event );
    void mouseDoubleClickEvent ( QMouseEvent * event );
    void mousePressEvent( QMouseEvent* event );
    void mouseReleaseEvent( QMouseEvent* event );
    void mouseMoveEvent( QMouseEvent* event );
    void wheelEvent( QWheelEvent* event );
}

Then I override the following (for the workaround)

void MyWidget::mouseDoubleClickEvent(QMouseEvent * event)
{
    // ... do some other stuff ...
    // This is a workaround to prevent the cursor from changing
    setCursor(cursor());
    event->accept();
}
void MyWidget::mousePressEvent(QMouseEvent * event)
{
    // ... do some other stuff ...
    // This is a workaround to prevent the cursor from changing
    setCursor(cursor());
    event->accept();
}

To change cursor assuming that mywidget is instantiated with my class, I do this: mywidget->setCursor(Qt::CrossCursor) Again, it changes the cursor as expected when I hover over my control, but it changes back to the application cursor once I press the mouse button (thus the need for the above workaround)

Upvotes: 2

Views: 4930

Answers (2)

yao_seeeeeeeeeu
yao_seeeeeeeeeu

Reputation: 11

QApplication.setOverrideCursor(QtGui.QCursor(Qt.CrossCursor))

and when the QWidget closed， set back to the original cursor

Upvotes: 1

dashesy
dashesy

Reputation: 2645

Ok I still have not found any answer for this, so here is the workaround:

void MyWidget::mouseDoubleClickEvent(QMouseEvent * event)
{
    // ... do some other stuff ...
    // This is a workaround to prevent the cursor from changing
    setCursor(cursor());
    event->accept();
}
void MyWidget::mousePressEvent(QMouseEvent * event)
{
    // ... do some other stuff ...
    // This is a workaround to prevent the cursor from changing
    setCursor(cursor());
    event->accept();
}

Upvotes: 0

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