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<title>Popup Widgets</title>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>Popup Widgets</h1>
<p>
This example shows how to implement widgets that should
pop up.
<p> <hr>
<p> Header file:
<p> <pre>/****************************************************************************
** $Id: qt/popup.h 3.0.2 edited Oct 12 12:18 $
**
** Definition of something or other
**
** Created : 979899
**
** Copyright (C) 1997 by Trolltech AS. All rights reserved.
**
** This file is part of an example program for Qt. This example
** program may be used, distributed and modified without limitation.
**
*****************************************************************************/
#ifndef POPUP_H
#define POPUP_H
#include <<a href="qlabel-h.html">qlabel.h</a>>
#include <<a href="qpushbutton-h.html">qpushbutton.h</a>>
#include <<a href="qlineedit-h.html">qlineedit.h</a>>
class FancyPopup : public <a href="qlabel.html">QLabel</a>
{
<a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>
public:
FancyPopup( <a href="qwidget.html">QWidget</a>* parent = 0, const char* name=0);
void popup( <a href="qwidget.html">QWidget</a>* parent = 0);
protected:
virtual void mouseMoveEvent( <a href="qmouseevent.html">QMouseEvent</a> * );
virtual void mouseReleaseEvent( <a href="qmouseevent.html">QMouseEvent</a> * );
virtual void closeEvent( <a href="qcloseevent.html">QCloseEvent</a> * );
private:
<a href="qwidget.html">QWidget</a>* popupParent;
int moves;
};
class Frame : public <a href="qframe.html">QFrame</a>
{
Q_OBJECT
public:
Frame( <a href="qwidget.html">QWidget</a> *parent=0, const char* name=0);
protected:
private slots:
void button1Clicked();
void button2Pressed();
private:
<a href="qpushbutton.html">QPushButton</a> *button1;
<a href="qpushbutton.html">QPushButton</a> *button2;
<a href="qframe.html">QFrame</a>* popup1;
FancyPopup* popup2;
};
#endif
</pre>
<p> <hr>
<p> Implementation:
<p> <pre>/****************************************************************************
** $Id: qt/popup.cpp 3.0.2 edited Oct 12 12:18 $
**
** Copyright (C) 1992-2000 Trolltech AS. All rights reserved.
**
** This file is part of an example program for Qt. This example
** program may be used, distributed and modified without limitation.
**
*****************************************************************************/
#include "popup.h"
#include <<a href="qapplication-h.html">qapplication.h</a>>
#include <<a href="qlayout-h.html">qlayout.h</a>>
<a name="f291"></a>FancyPopup::FancyPopup( <a href="qwidget.html">QWidget</a>* parent, const char* name ):
<a href="qlabel.html">QLabel</a>( parent, name, WType_Popup ){
<a href="qframe.html#setFrameStyle">setFrameStyle</a>( WinPanel|Raised );
<a href="qlabel.html#setAlignment">setAlignment</a>( AlignCenter );
<a href="qwidget.html#resize">resize</a>(150,100);
moves = 0;
<a href="qwidget.html#setMouseTracking">setMouseTracking</a>( TRUE );
}
<a name="x892"></a>void FancyPopup::<a href="qwidget.html#mouseMoveEvent">mouseMoveEvent</a>( <a href="qmouseevent.html">QMouseEvent</a> * e){
moves++;
<a href="qstring.html">QString</a> s;
<a name="x885"></a> s.<a href="qstring.html#sprintf">sprintf</a>("%d/%d", e-><a href="qmouseevent.html#pos">pos</a>().x(), e-><a href="qmouseevent.html#pos">pos</a>().y());
<a name="x886"></a> if (e-><a href="qmouseevent.html#state">state</a>() & QMouseEvent::LeftButton)
s += " (down)";
<a href="qlabel.html#setText">setText</a>(s);
}
<a name="x893"></a>void FancyPopup::<a href="qwidget.html#mouseReleaseEvent">mouseReleaseEvent</a>( <a href="qmouseevent.html">QMouseEvent</a> * e){
if (<a href="qwidget.html#rect">rect</a>().contains( e-><a href="qmouseevent.html#pos">pos</a>() ) || moves > 5)
<a href="qwidget.html#close">close</a>();
}
<a name="x889"></a>void FancyPopup::<a href="qwidget.html#closeEvent">closeEvent</a>( <a href="qcloseevent.html">QCloseEvent</a> *e ){
<a name="x881"></a> e-><a href="qcloseevent.html#accept">accept</a>();
moves = 0;
if (!popupParent)
return;
// remember that we (as a popup) might recieve the mouse release
// event instead of the popupParent. This is due to the fact that
// the popupParent popped us up in its mousePressEvent handler. To
// avoid the button remaining in pressed state we simply send a
// faked mouse button release event to it.
<a href="qmouseevent.html">QMouseEvent</a> me( QEvent::MouseButtonRelease, QPoint(0,0), QPoint(0,0), QMouseEvent::LeftButton, QMouseEvent::NoButton);
<a name="x876"></a> QApplication::<a href="qapplication.html#sendEvent">sendEvent</a>( popupParent, &me );
}
void <a name="f292"></a>FancyPopup::popup( <a href="qwidget.html">QWidget</a>* parent) {
popupParent = parent;
setText("Move the mouse!");
if (popupParent)
<a href="qwidget.html#move">move</a>( popupParent->mapToGlobal( popupParent->rect().bottomLeft() ) );
<a href="qwidget.html#show">show</a>();
}
<a name="f293"></a>Frame::Frame(QWidget* parent, const char* name): <a href="qframe.html">QFrame</a>(parent, name){
button1 = new <a href="qpushbutton.html">QPushButton</a>("Simple Popup", this);
<a href="qobject.html#connect">connect</a> ( button1, SIGNAL( <a href="qbutton.html#clicked">clicked</a>() ), SLOT( button1Clicked() ) );
button2 = new <a href="qpushbutton.html">QPushButton</a>("Fancy Popup", this);
<a name="x880"></a> <a href="qobject.html#connect">connect</a> ( button2, SIGNAL( <a href="qbutton.html#pressed">pressed</a>() ), SLOT( button2Pressed() ) );
<a href="qboxlayout.html">QBoxLayout</a> * l = new <a href="qhboxlayout.html">QHBoxLayout</a>( this );
<a name="x901"></a><a name="x899"></a> button1-><a href="qwidget.html#setMaximumSize">setMaximumSize</a>(button1-><a href="qwidget.html#sizeHint">sizeHint</a>());
button2-><a href="qwidget.html#setMaximumSize">setMaximumSize</a>(button2-><a href="qwidget.html#sizeHint">sizeHint</a>());
l-><a href="qboxlayout.html#addWidget">addWidget</a>( button1 );
l-><a href="qboxlayout.html#addWidget">addWidget</a>( button2 );
<a name="x883"></a> l-><a href="qlayout.html#activate">activate</a>();
<a name="x898"></a>// button1-><a href="qwidget.html#setGeometry">setGeometry</a>(20,20,100,30);
// button2-><a href="qwidget.html#setGeometry">setGeometry</a>(140,20,100,30);
<a href="qwidget.html#resize">resize</a>(270, 70);
//create a very simple popup: it is just composed with other
//widget and will be shown after clicking on button1
popup1 = new <a href="qframe.html">QFrame</a>( this ,0, WType_Popup);
popup1-><a href="qframe.html#setFrameStyle">setFrameStyle</a>( WinPanel|Raised );
popup1-><a href="qwidget.html#resize">resize</a>(150,100);
<a href="qlineedit.html">QLineEdit</a> *tmpE = new <a href="qlineedit.html">QLineEdit</a>( popup1 );
<a name="x891"></a><a name="x884"></a> <a href="qobject.html#connect">connect</a>( tmpE, SIGNAL( <a href="qlineedit.html#returnPressed">returnPressed</a>() ), popup1, SLOT( <a href="qwidget.html#hide">hide</a>() ) );
tmpE-><a href="qwidget.html#setGeometry">setGeometry</a>(10,10, 130, 30);
<a name="x897"></a> tmpE-><a href="qwidget.html#setFocus">setFocus</a>();
<a href="qpushbutton.html">QPushButton</a> *tmpB = new <a href="qpushbutton.html">QPushButton</a>("Click me!", popup1);
<a name="x888"></a> <a href="qobject.html#connect">connect</a>( tmpB, SIGNAL( <a href="qbutton.html#clicked">clicked</a>() ), popup1, SLOT( <a href="qwidget.html#close">close</a>() ) );
tmpB-><a href="qwidget.html#setGeometry">setGeometry</a>(10, 50, 130, 30);
// the fancier version uses its own class. It will be shown when
// pressing button2, so they behavior is more like a modern menu
// or toolbar.
popup2 = new FancyPopup( this );
// you might also add new widgets to the popup, just like you do
// it with any other widget. The next four lines (if not
// commented out) will for instance add a line edit widget.
// tmpE = new <a href="qlineedit.html">QLineEdit</a>( popup2 );
// tmpE-><a href="qwidget.html#setFocus">setFocus</a>();
// connect( tmpE, SIGNAL( <a href="qlineedit.html#returnPressed">returnPressed</a>() ), popup2, SLOT( <a href="qwidget.html#close">close</a>() ) );
// tmpE-><a href="qwidget.html#setGeometry">setGeometry</a>(10, 10, 130, 30);
}
void <a name="f294"></a>Frame::button1Clicked(){
<a name="x894"></a><a name="x890"></a> popup1-><a href="qwidget.html#move">move</a>( <a href="qwidget.html#mapToGlobal">mapToGlobal</a>( button1-><a href="qwidget.html#geometry">geometry</a>().bottomLeft() ) );
<a name="x900"></a> popup1-><a href="qwidget.html#show">show</a>();
}
void <a name="f295"></a>Frame::button2Pressed(){
popup2->popup(button2);
}
int main( int argc, char **argv )
{
<a href="qapplication.html">QApplication</a> a(argc,argv);
Frame frame;
frame.<a href="qwidget.html#setCaption">setCaption</a>("Qt Example - Custom Popups");
a.<a href="qapplication.html#setMainWidget">setMainWidget</a>(&frame);
frame.<a href="qwidget.html#show">show</a>();
return a.<a href="qapplication.html#exec">exec</a>();
}
</pre>
<p>See also <a href="examples.html">Examples</a>.
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