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    <p>I would simply use a Style Sheet for the whole window.</p> <p>For instance, if your window is inheriting from QWidget, here is what I'm doing :</p> <pre><code>MainWindow::MainWindow(QWidget *parent) : QWidget(parent), ui(new Ui::MainWindow) { ui-&gt;setupUi(this); this-&gt;setStyleSheet("background-color: black;"); } </code></pre> <p>On my Mac, my whole application window is black (except the title bar).</p> <p>EDIT : according to comment, here is a solution without using ui files and loading an external style sheet</p> <pre><code>#include &lt;QtGui/QApplication&gt; #include &lt;QtGui/QMainWindow&gt; #include &lt;QtGui/QVBoxLayout&gt; #include &lt;QtGui/QPushButton&gt; #include &lt;QtCore/QFile&gt; int main(int ArgC, char* ArgV[]) { QApplication MyApp(ArgC, ArgV); QMainWindow* pWindow = new QMainWindow; QVBoxLayout* pLayout = new QVBoxLayout(pWindow); pWindow-&gt;setLayout(pLayout); QPushButton* pButton = new QPushButton("Test", pWindow); pLayout-&gt;addWidget(pButton); QFile file(":/qss/default.qss"); file.open(QFile::ReadOnly); QString styleSheet = QLatin1String(file.readAll()); qApp-&gt;setStyleSheet(styleSheet); pWindow-&gt;setVisible(true); MyApp.exec(); } </code></pre> <p>The style sheet file (default.qss) is as follow :</p> <pre><code>QWidget { background-color: black; } </code></pre> <p>This file is part of a resource file (stylesheet.qrc) :</p> <pre><code>&lt;RCC&gt; &lt;qresource prefix="/qss"&gt; &lt;file&gt;default.qss&lt;/file&gt; &lt;/qresource&gt; &lt;/RCC&gt; </code></pre> <p>And here is my project file :</p> <pre><code>TARGET = StyleSheet TEMPLATE = app SOURCES += main.cpp RESOURCES += stylesheet.qrc </code></pre>
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    1. POHow do I set a background color for the whole window of a Qt application?
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    1. POHow do I set a background color for the whole window of a Qt application?
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    1. COHow do I do this in a stylesheet? I've done this for widgets like the QPushButton but cannot figure out what to use for the background as a whole.
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    2. COLet me clarify on a few things too. I am not using a .ui file from designer since I hand coded everything. Also, I have a separate stylesheet .qss file versus putting the code directly into the source code.
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    3. COThanks, I knew it was right under my nose. QWidget { background-color: black;} was what I needed. I didn't realized I could directly use QWidget.
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