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POQt widget size recalculation at runtime
 

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  1. POQt widget size recalculation at runtime
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    <p>I have a problem with size calculation in Qt when adding new widgets at run time. I have tried to illustrate the problem with the pruned program down there. Hopefully, it shows the same problem than my other (more complex) program:</p> <p>When a widget has been shown, using:</p> <pre><code>w-&gt;show(); </code></pre> <p>...and some new widgets are added to it later on (possibly <code>w</code> has a layout), what should I do to redisplay <code>w</code> and its parents so that the size of the newly added child widgets is taken into account? The behaviour I want is that the size recalculation propagates upward to the nearest scrolled object (or the main window if there is no scrolled objects)</p> <p>In the example below, I create a little widget structure: if the call to <code>show()</code> (commented SHOW1) is removed, then the whole widget structure is defined before the first call to <code>show()</code> and everything works. BUT: if I do call <code>show()</code> (at SHOW1), then the last show does not display the right things: the frame is still too small</p> <pre><code> #include &lt;QApplication&gt; #include &lt;QtCore&gt; #include &lt;QMainWindow&gt; #include &lt;QTabWidget&gt; #include &lt;QWidget&gt; #include &lt;QGroupBox&gt; #include &lt;QVBoxLayout&gt; #include &lt;QLabel&gt; #include &lt;stdlib.h&gt; int main(int argc, char *argv[]) { QApplication app(argc, argv); QMainWindow* main_window = new(QMainWindow); main_window-&gt;setObjectName("main_window"); main_window-&gt;resize(800, 600); main_window-&gt;setWindowTitle("Hello"); QTabWidget* node_tab_widget = new QTabWidget(main_window); node_tab_widget-&gt;setObjectName(QString::fromUtf8("tab_widget")); QWidget* w= new QWidget(node_tab_widget); node_tab_widget-&gt;addTab(w, "TAB"); QGroupBox* group_widget = new QGroupBox("GROUPNAME", w); QVBoxLayout* group_layout = new QVBoxLayout; group_widget-&gt;setLayout(group_layout); group_layout-&gt;addWidget((QLabel*)new QLabel("&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;here1")); main_window-&gt;show(); // SHOW1: If this one is commented, then OK! group_layout-&gt;addWidget((QLabel*)new QLabel("here2")); group_layout-&gt;addWidget((QLabel*)new QLabel("here2")); group_layout-&gt;addWidget((QLabel*)new QLabel("here2")); group_layout-&gt;addWidget((QLabel*)new QLabel("here2")); main_window-&gt;setCentralWidget(node_tab_widget); // main_window-&gt;update(); // main_window-&gt;hide(); main_window-&gt;show(); // How to I get that to recaclulate the size of its contents? return app.exec(); } </code></pre>
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    1. USuser1159290
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    1. COI'll submit a more detailed answer in a bit. Just briefly though: I believe that the solution will rely on any child widgets which dictate the size of the parent being members of a layout inside that parent, and supplying a sensible [`minimumSize`](http://developer.qt.nokia.com/doc/qt-4.8/qwidget.html#minimumSize-prop) when requested by that layout.
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    2. COA minor point, but I would suggest you try to be consistent in your coding style. You've used three different forms of `new` in that code: `new(QMainWindow)`, `new QTabWidget(main_window)` and `new QVBoxLayout`. You might find [this question's](http://stackoverflow.com/q/1885849/594137) answers to be useful.
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      1. USSamuel Harmer
 

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