Qt按键测试（二）（源代码）

#include <QPoint> #include <QKeyEvent> #include <QPainter> #include "Widget.h" Widget::Widget( void ): QWidget( 0 ), m_PressedKeys( 0 ) { // 设置窗口的一些属性 setFixedSize( 640, 360 ); setWindowTitle( tr( "KeyTest" ) ); // 设置文字 m_Text = tr( "Try to press key.\n" ); } /*---------------------------------------------------------------------------*/ Widget::~Widget( void ) { } /*---------------------------------------------------------------------------*/ void Widget::paintEvent( QPaintEvent* event ) { Q_UNUSED( event ) QPainter painter( this ); painter.drawText( QPoint( 32, 32 ), m_Text ); painter.drawText( QPoint( 32, 64 ), m_ShowText ); } /*---------------------------------------------------------------------------*/ void Widget::keyPressEvent( QKeyEvent* event ) { switch ( event->key( ) ) { case Qt::Key_Up: SaveKeyPressed( Key_Up ); break; case Qt::Key_Down: SaveKeyPressed( Key_Down ); break; case Qt::Key_Left: SaveKeyPressed( Key_Left ); break; case Qt::Key_Right: SaveKeyPressed( Key_Right ); break; default: break; } SetShowText( ); update( ); } /*---------------------------------------------------------------------------*/ void Widget::keyReleaseEvent( QKeyEvent* event ) { switch ( event->key( ) ) { case Qt::Key_Up: SaveKeyReleased( Key_Up ); break; case Qt::Key_Down: SaveKeyReleased( Key_Down ); break; case Qt::Key_Left: SaveKeyReleased( Key_Left ); break; case Qt::Key_Right: SaveKeyReleased( Key_Right ); break; default: break; } SetShowText( ); update( ); } /*---------------------------------------------------------------------------*/ void Widget::SetShowText( void ) { m_ShowText = tr( "Pressed Keys: " ); if ( KeyPressed( Key_Up ) ) m_ShowText += tr( "Up " ); if ( KeyPressed( Key_Down ) ) m_ShowText += tr( "Down " ); if ( KeyPressed( Key_Left ) ) m_ShowText += tr( "Left " ); if ( KeyPressed( Key_Right ) ) m_ShowText += tr( "Right " ); }