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POCreate a popup window in Qt without a shadow
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copied!<p>I'm developing an application using Qt 4.5 (under Windows Vista but want it to be cross platform). I'm using C++</p> <p>I'd like to create a popup window that that contains a QLineEdit widget, with the feature that when the user interacts with the QLineEdit widget, the popup window is not activated (the main application window remains active). </p> <p>Creating a window (widget) with the Qt::Popup | Qt::Window flags gives me exactly what I want, except i don't want the 3D shadow border effect this provides. I want a borderless window. Note that the Qt::FramelessWindowHint flag doesn't achieve this. </p> <p>Anyone got any clues?</p> <p>Further clarification: Below is a snippit from a simple test application that creates a window with a button in it. When the button is pressed, a popup window is shown and the user can type into a QLineEdit box. When the user does this, the main window remains activated:</p> <p><a href="http://howlettresearch.com/popup_img_1.png" rel="noreferrer">http://howlettresearch.com/popup_img_1.png</a></p> <p>However, note the shadow border on the popup window (I have been unable to get rid of this).</p> <p>By comparison, creating the window as in the commented out line allows a popup style window to be created without a shadow, but when the user clicks on the QLineEdit in the popup, the main window is no longer active. You can tell because the shadow on the main window has changed.</p> <p><a href="http://howlettresearch.com/popup_img_2.png" rel="noreferrer">http://howlettresearch.com/popup_img_2.png</a></p> <p>I'm really after a popup window which behaves as if it is part of the main window. As a side note, the popup window disappears when clicking outside it, but this is almost the behavior I want and I can work with this and grabMouse etc. to do what I want... provided I can get rid of that shadow! </p> <pre><code>PopupTest::PopupTest(QWidget *parent, Qt::WFlags flags) : QMainWindow(parent, flags) { QPushButton* pb = new QPushButton("test button"); setCentralWidget(pb); QObject::connect(pb, SIGNAL(clicked()), this, SLOT(handleClick())); } void PopupTest::handleClick() { //QFrame* popup1 = new QFrame(this, Qt::Tool | Qt::Window | Qt::FramelessWindowHint); QFrame* popup1 = new QFrame(this, Qt::Popup | Qt::Window ); popup1->resize(150,100); QLineEdit *tmpE = new QLineEdit( popup1 ); connect( tmpE, SIGNAL( returnPressed() ), popup1, SLOT( hide() ) ); tmpE->setGeometry(10,10, 130, 30); tmpE->setFocus(); popup1->show(); } PopupTest::~PopupTest() { } </code></pre>

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