source: trunk/doc/html/popup-example.html

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1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
2<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/examples/popup/popup.doc:4 -->
3<html>
4<head>
5<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
6<title>Popup Widgets</title>
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8fn { margin-left: 1cm; text-indent: -1cm; }
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17<tr bgcolor="#E5E5E5">
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19 <a href="index.html">
20<font color="#004faf">Home</font></a>
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30<font color="#004faf">Functions</font></a>
31</td>
32<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>
33
34
35<p>
36This example shows how to implement widgets that should
37pop up.
38<p> <hr>
39<p> Header file:
40<p> <pre>/****************************************************************************
41** $Id: popup-example.html 2051 2007-02-21 10:04:20Z chehrlic $
42**
43** Definition of something or other
44**
45** Created : 979899
46**
47** Copyright (C) 1997-2007 Trolltech ASA. All rights reserved.
48**
49** This file is part of an example program for Qt. This example
50** program may be used, distributed and modified without limitation.
51**
52*****************************************************************************/
53
54#ifndef POPUP_H
55#define POPUP_H
56#include &lt;<a href="qlabel-h.html">qlabel.h</a>&gt;
57#include &lt;<a href="qpushbutton-h.html">qpushbutton.h</a>&gt;
58#include &lt;<a href="qlineedit-h.html">qlineedit.h</a>&gt;
59
60class FancyPopup : public <a href="qlabel.html">QLabel</a>
61{
62 <a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>
63public:
64 FancyPopup( <a href="qwidget.html">QWidget</a>* parent = 0, const char* name=0);
65
66 void popup( <a href="qwidget.html">QWidget</a>* parent = 0);
67protected:
68 virtual void mouseMoveEvent( <a href="qmouseevent.html">QMouseEvent</a> * );
69 virtual void mouseReleaseEvent( <a href="qmouseevent.html">QMouseEvent</a> * );
70 virtual void closeEvent( <a href="qcloseevent.html">QCloseEvent</a> * );
71
72private:
73 <a href="qwidget.html">QWidget</a>* popupParent;
74 int moves;
75};
76
77
78 class Frame : public <a href="qframe.html">QFrame</a>
79 {
80 Q_OBJECT
81 public:
82 Frame( <a href="qwidget.html">QWidget</a> *parent=0, const char* name=0);
83
84 protected:
85
86 private slots:
87 void button1Clicked();
88 void button2Pressed();
89
90 private:
91 <a href="qpushbutton.html">QPushButton</a> *button1;
92 <a href="qpushbutton.html">QPushButton</a> *button2;
93
94 <a href="qframe.html">QFrame</a>* popup1;
95 FancyPopup* popup2;
96 };
97
98#endif
99</pre>
100
101<p> <hr>
102<p> Implementation:
103<p> <pre>/****************************************************************************
104** $Id: popup-example.html 2051 2007-02-21 10:04:20Z chehrlic $
105**
106** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
107**
108** This file is part of an example program for Qt. This example
109** program may be used, distributed and modified without limitation.
110**
111*****************************************************************************/
112
113#include "popup.h"
114#include &lt;<a href="qapplication-h.html">qapplication.h</a>&gt;
115#include &lt;<a href="qlayout-h.html">qlayout.h</a>&gt;
116
117<a name="f468"></a>FancyPopup::FancyPopup( <a href="qwidget.html">QWidget</a>* parent, const char* name ):
118 <a href="qlabel.html">QLabel</a>( parent, name, WType_Popup ){
119 <a href="qframe.html#setFrameStyle">setFrameStyle</a>( WinPanel|Raised );
120 <a href="qlabel.html#setAlignment">setAlignment</a>( AlignCenter );
121 <a href="qwidget.html#resize">resize</a>(150,100);
122 moves = 0;
123 <a href="qwidget.html#setMouseTracking">setMouseTracking</a>( TRUE );
124}
125
126<a name="x1620"></a>void FancyPopup::<a href="qwidget.html#mouseMoveEvent">mouseMoveEvent</a>( <a href="qmouseevent.html">QMouseEvent</a> * e){
127 moves++;
128 <a href="qstring.html">QString</a> s;
129<a name="x1611"></a> s.<a href="qstring.html#sprintf">sprintf</a>("%d/%d", e-&gt;<a href="qmouseevent.html#pos">pos</a>().x(), e-&gt;<a href="qmouseevent.html#pos">pos</a>().y());
130<a name="x1612"></a> if (e-&gt;<a href="qmouseevent.html#state">state</a>() &amp; QMouseEvent::LeftButton)
131 s += " (down)";
132 <a href="qlabel.html#setText">setText</a>(s);
133}
134
135<a name="x1621"></a>void FancyPopup::<a href="qwidget.html#mouseReleaseEvent">mouseReleaseEvent</a>( <a href="qmouseevent.html">QMouseEvent</a> * e){
136 if (<a href="qwidget.html#rect">rect</a>().contains( e-&gt;<a href="qmouseevent.html#pos">pos</a>() ) || moves &gt; 5)
137 <a href="qwidget.html#close">close</a>();
138}
139
140<a name="x1617"></a>void FancyPopup::<a href="qwidget.html#closeEvent">closeEvent</a>( <a href="qcloseevent.html">QCloseEvent</a> *e ){
141<a name="x1607"></a> e-&gt;<a href="qcloseevent.html#accept">accept</a>();
142 moves = 0;
143 if (!popupParent)
144 return;
145
146 // remember that we (as a popup) might recieve the mouse release
147 // event instead of the popupParent. This is due to the fact that
148 // the popupParent popped us up in its mousePressEvent handler. To
149 // avoid the button remaining in pressed state we simply send a
150 // faked mouse button release event to it.
151 <a href="qmouseevent.html">QMouseEvent</a> me( QEvent::MouseButtonRelease, QPoint(0,0), QPoint(0,0), QMouseEvent::LeftButton, QMouseEvent::NoButton);
152<a name="x1602"></a> QApplication::<a href="qapplication.html#sendEvent">sendEvent</a>( popupParent, &amp;me );
153}
154
155void <a name="f469"></a>FancyPopup::popup( <a href="qwidget.html">QWidget</a>* parent) {
156 popupParent = parent;
157 setText("Move the mouse!");
158 if (popupParent)
159 <a href="qwidget.html#move">move</a>( popupParent-&gt;mapToGlobal( popupParent-&gt;rect().bottomLeft() ) );
160 <a href="qwidget.html#show">show</a>();
161}
162
163
164
165
166
167
168<a name="f470"></a>Frame::Frame(QWidget* parent, const char* name): <a href="qframe.html">QFrame</a>(parent, name){
169 button1 = new <a href="qpushbutton.html">QPushButton</a>("Simple Popup", this);
170 <a href="qobject.html#connect">connect</a> ( button1, SIGNAL( <a href="qbutton.html#clicked">clicked</a>() ), SLOT( button1Clicked() ) );
171 button2 = new <a href="qpushbutton.html">QPushButton</a>("Fancy Popup", this);
172<a name="x1606"></a> <a href="qobject.html#connect">connect</a> ( button2, SIGNAL( <a href="qbutton.html#pressed">pressed</a>() ), SLOT( button2Pressed() ) );
173
174 <a href="qboxlayout.html">QBoxLayout</a> * l = new <a href="qhboxlayout.html">QHBoxLayout</a>( this );
175<a name="x1627"></a><a name="x1614"></a> button1-&gt;<a href="qwidget.html#setMaximumSize">setMaximumSize</a>(button1-&gt;<a href="qwidget.html#sizeHint">sizeHint</a>());
176 button2-&gt;<a href="qwidget.html#setMaximumSize">setMaximumSize</a>(button2-&gt;<a href="qwidget.html#sizeHint">sizeHint</a>());
177 l-&gt;<a href="qboxlayout.html#addWidget">addWidget</a>( button1 );
178 l-&gt;<a href="qboxlayout.html#addWidget">addWidget</a>( button2 );
179<a name="x1609"></a> l-&gt;<a href="qlayout.html#activate">activate</a>();
180
181<a name="x1613"></a>// button1-&gt;<a href="qwidget.html#setGeometry">setGeometry</a>(20,20,100,30);
182// button2-&gt;<a href="qwidget.html#setGeometry">setGeometry</a>(140,20,100,30);
183 <a href="qwidget.html#resize">resize</a>(270, 70);
184
185 //create a very simple popup: it is just composed with other
186 //widget and will be shown after clicking on button1
187
188 popup1 = new <a href="qframe.html">QFrame</a>( this ,0, WType_Popup);
189 popup1-&gt;<a href="qframe.html#setFrameStyle">setFrameStyle</a>( WinPanel|Raised );
190 popup1-&gt;<a href="qwidget.html#resize">resize</a>(150,100);
191 <a href="qlineedit.html">QLineEdit</a> *tmpE = new <a href="qlineedit.html">QLineEdit</a>( popup1 );
192<a name="x1619"></a><a name="x1610"></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>() ) );
193<a name="x1626"></a> tmpE-&gt;<a href="qwidget.html#setGeometry">setGeometry</a>(10,10, 130, 30);
194<a name="x1625"></a> tmpE-&gt;<a href="qwidget.html#setFocus">setFocus</a>();
195 <a href="qpushbutton.html">QPushButton</a> *tmpB = new <a href="qpushbutton.html">QPushButton</a>("Click me!", popup1);
196<a name="x1616"></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>() ) );
197 tmpB-&gt;<a href="qwidget.html#setGeometry">setGeometry</a>(10, 50, 130, 30);
198
199 // the fancier version uses its own class. It will be shown when
200 // pressing button2, so they behavior is more like a modern menu
201 // or toolbar.
202
203 popup2 = new FancyPopup( this );
204
205 // you might also add new widgets to the popup, just like you do
206 // it with any other widget. The next four lines (if not
207 // commented out) will for instance add a line edit widget.
208
209// tmpE = new <a href="qlineedit.html">QLineEdit</a>( popup2 );
210// tmpE-&gt;<a href="qwidget.html#setFocus">setFocus</a>();
211// connect( tmpE, SIGNAL( <a href="qlineedit.html#returnPressed">returnPressed</a>() ), popup2, SLOT( <a href="qwidget.html#close">close</a>() ) );
212// tmpE-&gt;<a href="qwidget.html#setGeometry">setGeometry</a>(10, 10, 130, 30);
213}
214
215
216void <a name="f471"></a>Frame::button1Clicked(){
217<a name="x1622"></a><a name="x1618"></a> popup1-&gt;<a href="qwidget.html#move">move</a>( <a href="qwidget.html#mapToGlobal">mapToGlobal</a>( button1-&gt;<a href="qwidget.html#geometry">geometry</a>().bottomLeft() ) );
218<a name="x1628"></a> popup1-&gt;<a href="qwidget.html#show">show</a>();
219}
220
221void <a name="f472"></a>Frame::button2Pressed(){
222 popup2-&gt;popup(button2);
223}
224
225
226int main( int argc, char **argv )
227{
228 <a href="qapplication.html">QApplication</a> a(argc,argv);
229
230 Frame frame;
231 frame.<a href="qwidget.html#setCaption">setCaption</a>("Qt Example - Custom Popups");
232 a.<a href="qapplication.html#setMainWidget">setMainWidget</a>(&amp;frame);
233 frame.<a href="qwidget.html#show">show</a>();
234 return a.<a href="qapplication.html#exec">exec</a>();
235}
236</pre>
237
238<p>See also <a href="examples.html">Examples</a>.
239
240<!-- eof -->
241<p><address><hr><div align=center>
242<table width=100% cellspacing=0 border=0><tr>
243<td>Copyright &copy; 2007
244<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
245<td align=right><div align=right>Qt 3.3.8</div>
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