Databases
StackOverflow2013
Postsdbo
POQPropertyAnimation reject to begin immediately after start() call
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POQPropertyAnimation reject to begin immediately after start() call
    primarykey
    data
    text
    <p>See code below. I have a button that starts the animation. The problem is that i see the animation only after SECOND button press. But when animation starts, i notice that it actually have been going since FIRST button press, because it starts from a moment = <code>[the time between 1 and 2 button press]</code>.</p> <p>The code: (sorry for overkill boost::shared_ptr)</p> <p><strong>WinWin.h</strong>:</p> <pre><code>#define LOGCOUT(x) { std::cout &lt;&lt; __FILE__ &lt;&lt; ":" &lt;&lt; __LINE__ &lt;&lt; " " &lt;&lt; x &lt;&lt; "\n"; } class WinWin: public QWidget { Q_OBJECT public: Q_PROPERTY(unsigned animprop READ getAnimProp WRITE setAnimProp); WinWin(); unsigned getAnimProp(); void setAnimProp(unsigned); protected: virtual void paintEvent(QPaintEvent *); public slots: void slotButtonClicked(); private: unsigned m_anim_prop; QPropertyAnimation *m_animation; QPushButton *m_button; }; </code></pre> <p><strong>WinWin.cpp</strong>:</p> <pre><code>WinWin::WinWin() : m_anim_prop(0) { m_animation = new QPropertyAnimation(this, "animprop"); m_button = new QPushButton(this); m_button-&gt;setText( "Start" ); m_button-&gt;move ( 40, 40 ); m_button-&gt;resize( 100, 30 ); m_button-&gt;show(); resize( 640, 480 ); connect( m_button.get(), SIGNAL(clicked()), this, SLOT(slotButtonClicked()) ); } unsigned WinWin::getAnimProp() { } void WinWin::setAnimProp(unsigned _prop) { LOGCOUT("anim " &lt;&lt; _prop); m_anim_prop = _prop; update(); } void WinWin::paintEvent(QPaintEvent *) { QPainter painter( this ); painter.setPen( QColor(0x00, 0x00, 0x00, 0xff) ); painter.drawLine( 0, 0, width(), m_anim_prop ); } void WinWin::slotButtonClicked() { m_animation-&gt;setDuration( 1000 * 4 ); m_animation-&gt;setStartValue( 0 ); m_animation-&gt;setEndValue( height() ); m_animation-&gt;setLoopCount( -1 ); // infinite number of loops // Fire! m_animation-&gt;start(); LOGCOUT( m_animation-&gt;state() ); // says: 2 } </code></pre> <p><strong>main.cpp</strong>:</p> <pre><code>int main ( int argc, char **argv ) { QApplication app(argc, argv); WinWin winwin; winwin.show(); return app.exec(); } </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USpavelkolodin
    1. USpavelkolodin
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. CO@KubaOber but does the QObject will be deleted automatically if is has no parent? For example, QPropertyAnimation has no parent. It knows about `this`, but this is not its parent. It is just an object that should be notified on animation ticks.
      singulars
      1. POQPropertyAnimation reject to begin immediately after start() call
      1. USpavelkolodin
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload