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This example shows how to implement widgets that should pop up.
Header file:
/**************************************************************************** ** $Id: qt/popup.h 3.1.2 edited Nov 8 10:35 $ ** ** 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 <qlabel.h> #include <qpushbutton.h> #include <qlineedit.h> class FancyPopup : public QLabel { Q_OBJECT public: FancyPopup( QWidget* parent = 0, const char* name=0); void popup( QWidget* parent = 0); protected: virtual void mouseMoveEvent( QMouseEvent * ); virtual void mouseReleaseEvent( QMouseEvent * ); virtual void closeEvent( QCloseEvent * ); private: QWidget* popupParent; int moves; }; class Frame : public QFrame { Q_OBJECT public: Frame( QWidget *parent=0, const char* name=0); protected: private slots: void button1Clicked(); void button2Pressed(); private: QPushButton *button1; QPushButton *button2; QFrame* popup1; FancyPopup* popup2; }; #endif
Implementation:
/**************************************************************************** ** $Id: qt/popup.cpp 3.1.2 edited Nov 8 10:35 $ ** ** 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 <qapplication.h> #include <qlayout.h> FancyPopup::FancyPopup( QWidget* parent, const char* name ): QLabel( parent, name, WType_Popup ){ setFrameStyle( WinPanel|Raised ); setAlignment( AlignCenter ); resize(150,100); moves = 0; setMouseTracking( TRUE ); } void FancyPopup::mouseMoveEvent( QMouseEvent * e){ moves++; QString s; s.sprintf("%d/%d", e->pos().x(), e->pos().y()); if (e->state() & QMouseEvent::LeftButton) s += " (down)"; setText(s); } void FancyPopup::mouseReleaseEvent( QMouseEvent * e){ if (rect().contains( e->pos() ) || moves > 5) close(); } void FancyPopup::closeEvent( QCloseEvent *e ){ e->accept(); 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. QMouseEvent me( QEvent::MouseButtonRelease, QPoint(0,0), QPoint(0,0), QMouseEvent::LeftButton, QMouseEvent::NoButton); QApplication::sendEvent( popupParent, &me ); } void FancyPopup::popup( QWidget* parent) { popupParent = parent; setText("Move the mouse!"); if (popupParent) move( popupParent->mapToGlobal( popupParent->rect().bottomLeft() ) ); show(); } Frame::Frame(QWidget* parent, const char* name): QFrame(parent, name){ button1 = new QPushButton("Simple Popup", this); connect ( button1, SIGNAL( clicked() ), SLOT( button1Clicked() ) ); button2 = new QPushButton("Fancy Popup", this); connect ( button2, SIGNAL( pressed() ), SLOT( button2Pressed() ) ); QBoxLayout * l = new QHBoxLayout( this ); button1->setMaximumSize(button1->sizeHint()); button2->setMaximumSize(button2->sizeHint()); l->addWidget( button1 ); l->addWidget( button2 ); l->activate(); // button1->setGeometry(20,20,100,30); // button2->setGeometry(140,20,100,30); resize(270, 70); //create a very simple popup: it is just composed with other //widget and will be shown after clicking on button1 popup1 = new QFrame( this ,0, WType_Popup); popup1->setFrameStyle( WinPanel|Raised ); popup1->resize(150,100); QLineEdit *tmpE = new QLineEdit( popup1 ); connect( tmpE, SIGNAL( returnPressed() ), popup1, SLOT( hide() ) ); tmpE->setGeometry(10,10, 130, 30); tmpE->setFocus(); QPushButton *tmpB = new QPushButton("Click me!", popup1); connect( tmpB, SIGNAL( clicked() ), popup1, SLOT( close() ) ); tmpB->setGeometry(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 QLineEdit( popup2 ); // tmpE->setFocus(); // connect( tmpE, SIGNAL( returnPressed() ), popup2, SLOT( close() ) ); // tmpE->setGeometry(10, 10, 130, 30); } void Frame::button1Clicked(){ popup1->move( mapToGlobal( button1->geometry().bottomLeft() ) ); popup1->show(); } void Frame::button2Pressed(){ popup2->popup(button2); } int main( int argc, char **argv ) { QApplication a(argc,argv); Frame frame; frame.setCaption("Qt Example - Custom Popups"); a.setMainWidget(&frame); frame.show(); return a.exec(); }
See also Examples.
Copyright © 2003 Trolltech | Trademarks | Qt version 3.1.2
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