[Solved]My dialog inside of my mainwindow is not working

[Project try]

Hey , yesterday I opened a post:

http://qt-project.org/forums/viewthread/42376/

and the guy said that I should try creating a transparent window , and I did it , I included the project " the transparent window " to my current project which has the problem that I opened a post for.. anyways my other dialogs are working when I use show and other methods , but when I used this:

@
FrameLess=new FramelessWindow(this);
FrameLess->exec(); // show() is not working
@

it works , only problem is it hides my mainwindow and it doesn't really show the background transparent window

here's the code for the frameless window:

@

this->setStyleSheet("background:transparent");
this->setAttribute(Qt::WA_TranslucentBackground);
this->setWindowFlags(Qt::FramelessWindowHint);
this->setWindowState(Qt::WindowFullScreen);

@

I only want it to show when I click any button " shows as a full screen transparent window that I can click anywhere in it without effecting the programs behind the window , I want it like a transparent wall :D

[Project try]

Well , I think I got it only problem as I said it doesn't show...

I added mouse events where when I press the left mouse button I can select anywhere in the widget, the only problem which is annoying is:

@
this->setAttribute(Qt::WA_TranslucentBackground);
@

this is the function that lets the widget be transparent , but when I use it the widget shows in the bar below " where all programs that are open are there " but i can select anything in the screen , which means it's not showing on the screen ?

[Project try]

I've tried everything :( , is there another method to do this ?

I saw this but still no one have a solution:

http://www.qtcentre.org/threads/53362-Qt5-Translucent-alpha-channel-problems

[andreyc]

Here is how I created a transparent window that fly on top of all windows and allows me to grab an area of a desktop. The key is a Qt::ToolTip.
I have found this idea somewhere but I don't have a link.
It works for me on Linux, have not tried it on Windows or MacOSX.

@
SelectImage::SelectImage(QWidget parent)
: QWidget(parent)
, m_rubberBand(nullptr)
{
setAttribute(Qt::WA_TranslucentBackground, true);
setWindowFlags(Qt::ToolTip | Qt::FramelessWindowHint);
QDesktopWidget desktop = QApplication::desktop();
resize(desktop->screenGeometry().size());
setCursor(Qt::CrossCursor);
}
@

Then I used the events from QRubberBand example and here is my mouseReleaseEvent
@
void SelectImage::mouseReleaseEvent(QMouseEvent *event)
{
m_close = event->pos();
m_rubberBand->hide();
QRect grabRect = QRect(m_open, m_close).normalized();
m_pixmap = QPixmap::grabWindow(QApplication::desktop()->winId())
.copy(grabRect);
close();
parentWidget()->show();
}
@

[Project try]

Still didn't work :(

not sure if it needs to be a child of another widget ? but I think it won't work since I've tried yesterday " not your method , but the one that I've posted " but still didn't work.

the window doesn't show/display , it's like there's nothing , I can't use my events at all! but when I delete

@
this->setAttribute(Qt::WA_TranslucentBackground);
@

it works fine except it's not transparent.

[andreyc]

Do you use style-sheets ? I think if you apply style-sheets then widgets behavior is different.
If you building screen snapshot tool then there is another idea.

• On start create a QPixmap from desktop
• Create your "transparent" widget
• Set background of the widget from the QPixmap.
• Show new widget
• Use QRubberBand to select area.
• On mouseRelease close the widget.

[andreyc]

[quote author="Project try" date="1399810333"]not sure if it needs to be a child of another widget ?[/quote]
Yes transparent window is another QWidget that is shown on demand.
I've used QWidget as parent class not QDialog.

[Project try]

Thanks , I actually thought of this yesterday , but never thought it would work , it actually worked doing what you've said , thanks so much ^^

but there's a little problem I think I'll make a new post about it since it's not related to this problem.