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239 lines
10 KiB
239 lines
10 KiB
'\" t
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.TH QEvent 3qt "2 February 2007" "Trolltech AS" \" -*- nroff -*-
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.\" Copyright 1992-2007 Trolltech ASA. All rights reserved. See the
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.\" license file included in the distribution for a complete license
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.\" statement.
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.\"
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.ad l
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.nh
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.SH NAME
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QEvent \- The base class of all event classes. Event objects contain event parameters
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.SH SYNOPSIS
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\fC#include <ntqevent.h>\fR
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.PP
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Inherits Qt.
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.PP
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Inherited by QTimerEvent, QMouseEvent, QWheelEvent, QTabletEvent, QKeyEvent, QFocusEvent, QPaintEvent, QMoveEvent, QResizeEvent, QCloseEvent, QIconDragEvent, QShowEvent, QHideEvent, QContextMenuEvent, QIMEvent, QDropEvent, QDragLeaveEvent, QChildEvent, and QCustomEvent.
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.PP
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.SS "Public Members"
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.in +1c
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.ti -1c
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.BI "enum \fBType\fR { None = 0, Timer = 1, MouseButtonPress = 2, MouseButtonRelease = 3, MouseButtonDblClick = 4, MouseMove = 5, KeyPress = 6, KeyRelease = 7, FocusIn = 8, FocusOut = 9, Enter = 10, Leave = 11, Paint = 12, Move = 13, Resize = 14, Create = 15, Destroy = 16, Show = 17, Hide = 18, Close = 19, Quit = 20, Reparent = 21, ShowMinimized = 22, ShowNormal = 23, WindowActivate = 24, WindowDeactivate = 25, ShowToParent = 26, HideToParent = 27, ShowMaximized = 28, ShowFullScreen = 29, Accel = 30, Wheel = 31, AccelAvailable = 32, CaptionChange = 33, IconChange = 34, ParentFontChange = 35, ApplicationFontChange = 36, ParentPaletteChange = 37, ApplicationPaletteChange = 38, PaletteChange = 39, Clipboard = 40, Speech = 42, SockAct = 50, AccelOverride = 51, DeferredDelete = 52, DragEnter = 60, DragMove = 61, DragLeave = 62, Drop = 63, DragResponse = 64, ChildInserted = 70, ChildRemoved = 71, LayoutHint = 72, ShowWindowRequest = 73, WindowBlocked = 74, WindowUnblocked = 75, ActivateControl = 80, DeactivateControl = 81, ContextMenu = 82, IMStart = 83, IMCompose = 84, IMEnd = 85, Accessibility = 86, TabletMove = 87, LocaleChange = 88, LanguageChange = 89, LayoutDirectionChange = 90, Style = 91, TabletPress = 92, TabletRelease = 93, OkRequest = 94, HelpRequest = 95, WindowStateChange = 96, IconDrag = 97, User = 1000, MaxUser = 65535 }"
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.br
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.ti -1c
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.BI "\fBQEvent\fR ( Type type )"
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.br
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.ti -1c
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.BI "virtual \fB~QEvent\fR ()"
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.br
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.ti -1c
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.BI "Type \fBtype\fR () const"
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.br
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.ti -1c
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.BI "bool \fBspontaneous\fR () const"
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.br
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.in -1c
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.SH DESCRIPTION
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The QEvent class is the base class of all event classes. Event objects contain event parameters.
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.PP
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Qt's main event loop (QApplication::exec()) fetches native window system events from the event queue, translates them into QEvents and sends the translated events to QObjects.
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.PP
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In general, events come from the underlying window system (spontaneous() returns TRUE) but it is also possible to manually send events using QApplication::sendEvent() and QApplication::postEvent() (spontaneous() returns FALSE).
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.PP
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QObjects receive events by having their QObject::event() function called. The function can be reimplemented in subclasses to customize event handling and add additional event types; QWidget::event() is a notable example. By default, events are dispatched to event handlers like QObject::timerEvent() and QWidget::mouseMoveEvent(). QObject::installEventFilter() allows an object to intercept events destined for another object.
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.PP
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The basic QEvent contains only an event type parameter. Subclasses of QEvent contain additional parameters that describe the particular event.
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.PP
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See also QObject::event(), QObject::installEventFilter(), QWidget::event(), QApplication::sendEvent(), QApplication::postEvent(), QApplication::processEvents(), Environment Classes, and Event Classes.
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.SS "Member Type Documentation"
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.SH "QEvent::Type"
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This enum type defines the valid event types in Qt. The event types and the specialized classes for each type are these:
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.TP
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\fCQEvent::None\fR - Not an event.
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.TP
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\fCQEvent::Accessibility\fR - Accessibility information is requested
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.TP
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\fCQEvent::Timer\fR - Regular timer events, QTimerEvent.
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.TP
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\fCQEvent::MouseButtonPress\fR - Mouse press, QMouseEvent.
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.TP
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\fCQEvent::MouseButtonRelease\fR - Mouse release, QMouseEvent.
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.TP
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\fCQEvent::MouseButtonDblClick\fR - Mouse press again, QMouseEvent.
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.TP
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\fCQEvent::MouseMove\fR - Mouse move, QMouseEvent.
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.TP
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\fCQEvent::KeyPress\fR - Key press (including Shift, for example), QKeyEvent.
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.TP
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\fCQEvent::KeyRelease\fR - Key release, QKeyEvent.
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.TP
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\fCQEvent::IMStart\fR - The start of input method composition, QIMEvent.
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.TP
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\fCQEvent::IMCompose\fR - Input method composition is taking place, QIMEvent.
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.TP
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\fCQEvent::IMEnd\fR - The end of input method composition, QIMEvent.
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.TP
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\fCQEvent::FocusIn\fR - Widget gains keyboard focus, QFocusEvent.
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.TP
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\fCQEvent::FocusOut\fR - Widget loses keyboard focus, QFocusEvent.
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.TP
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\fCQEvent::Enter\fR - Mouse enters widget's boundaries.
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.TP
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\fCQEvent::Leave\fR - Mouse leaves widget's boundaries.
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.TP
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\fCQEvent::Paint\fR - Screen update necessary, QPaintEvent.
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.TP
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\fCQEvent::Move\fR - Widget's position changed, QMoveEvent.
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.TP
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\fCQEvent::Resize\fR - Widget's size changed, QResizeEvent.
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.TP
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\fCQEvent::Show\fR - Widget was shown on screen, QShowEvent.
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.TP
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\fCQEvent::Hide\fR - Widget was hidden, QHideEvent.
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.TP
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\fCQEvent::ShowToParent\fR - A child widget has been shown.
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.TP
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\fCQEvent::HideToParent\fR - A child widget has been hidden.
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.TP
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\fCQEvent::Close\fR - Widget was closed (permanently), QCloseEvent.
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.TP
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\fCQEvent::ShowNormal\fR - Widget should be shown normally (obsolete).
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.TP
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\fCQEvent::ShowMaximized\fR - Widget should be shown maximized (obsolete).
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.TP
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\fCQEvent::ShowMinimized\fR - Widget should be shown minimized (obsolete).
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.TP
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\fCQEvent::ShowFullScreen\fR - Widget should be shown full-screen (obsolete).
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.TP
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\fCQEvent::ShowWindowRequest\fR - Widget's window should be shown (obsolete).
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.TP
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\fCQEvent::DeferredDelete\fR - The object will be deleted after it has cleaned up.
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.TP
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\fCQEvent::Accel\fR - Key press in child for shortcut key handling, QKeyEvent.
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.TP
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\fCQEvent::Wheel\fR - Mouse wheel rolled, QWheelEvent.
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.TP
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\fCQEvent::ContextMenu\fR - Context popup menu, QContextMenuEvent
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.TP
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\fCQEvent::AccelOverride\fR - Key press in child, for overriding shortcut key handling, QKeyEvent.
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.TP
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\fCQEvent::AccelAvailable\fR - internal.
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.TP
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\fCQEvent::WindowActivate\fR - Window was activated.
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.TP
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\fCQEvent::WindowDeactivate\fR - Window was deactivated.
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.TP
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\fCQEvent::CaptionChange\fR - Widget's caption changed.
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.TP
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\fCQEvent::IconChange\fR - Widget's icon changed.
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.TP
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\fCQEvent::ParentFontChange\fR - Font of the parent widget changed.
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.TP
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\fCQEvent::ApplicationFontChange\fR - Default application font changed.
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.TP
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\fCQEvent::PaletteChange\fR - Palette of the widget changed.
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.TP
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\fCQEvent::ParentPaletteChange\fR - Palette of the parent widget changed.
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.TP
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\fCQEvent::ApplicationPaletteChange\fR - Default application palette changed.
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.TP
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\fCQEvent::Clipboard\fR - Clipboard contents have changed.
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.TP
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\fCQEvent::SockAct\fR - Socket activated, used to implement QSocketNotifier.
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.TP
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\fCQEvent::DragEnter\fR - A drag-and-drop enters widget, QDragEnterEvent.
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.TP
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\fCQEvent::DragMove\fR - A drag-and-drop is in progress, QDragMoveEvent.
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.TP
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\fCQEvent::DragLeave\fR - A drag-and-drop leaves widget, QDragLeaveEvent.
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.TP
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\fCQEvent::Drop\fR - A drag-and-drop is completed, QDropEvent.
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.TP
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\fCQEvent::DragResponse\fR - Internal event used by Qt on some platforms.
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.TP
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\fCQEvent::ChildInserted\fR - Object gets a child, QChildEvent.
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.TP
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\fCQEvent::ChildRemoved\fR - Object loses a child, QChildEvent.
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.TP
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\fCQEvent::LayoutHint\fR - Widget child has changed layout properties.
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.TP
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\fCQEvent::ActivateControl\fR - Internal event used by Qt on some platforms.
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.TP
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\fCQEvent::DeactivateControl\fR - Internal event used by Qt on some platforms.
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.TP
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\fCQEvent::LanguageChange\fR - The application translation changed, QTranslator
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.TP
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\fCQEvent::LayoutDirectionChange\fR - The direction of layouts changed
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.TP
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\fCQEvent::LocaleChange\fR - The system locale changed
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.TP
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\fCQEvent::Quit\fR - Reserved.
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.TP
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\fCQEvent::Create\fR - Reserved.
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.TP
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\fCQEvent::Destroy\fR - Reserved.
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.TP
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\fCQEvent::Reparent\fR - Reserved.
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.TP
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\fCQEvent::Speech\fR - Reserved for speech input.
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.TP
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\fCQEvent::TabletMove\fR - A Wacom Tablet Move Event.
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.TP
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\fCQEvent::Style\fR - Internal use only
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.TP
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\fCQEvent::TabletPress\fR - A Wacom Tablet Press Event
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.TP
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\fCQEvent::TabletRelease\fR - A Wacom Tablet Release Event
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.TP
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\fCQEvent::OkRequest\fR - Internal event used by Qt on some platforms.
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.TP
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\fCQEvent::HelpRequest\fR - Internal event used by Qt on some platforms.
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.TP
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\fCQEvent::IconDrag\fR - Internal event used by Qt on some platforms when proxy icon is dragged.
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.TP
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\fCQEvent::WindowStateChange\fR - The window's state, i.e. minimized, maximized or full-screen, has changed. See QWidget::windowState().
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.TP
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\fCQEvent::WindowBlocked\fR - The window is modally blocked
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.TP
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\fCQEvent::WindowUnblocked\fR - The window leaves modal blocking
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.TP
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\fCQEvent::User\fR - User defined event.
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.TP
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\fCQEvent::MaxUser\fR - Last user event id.
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.PP
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User events should have values between User and MaxUser inclusive.
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.SH MEMBER FUNCTION DOCUMENTATION
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.SH "QEvent::QEvent ( Type type )"
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Contructs an event object of type \fItype\fR.
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.SH "QEvent::~QEvent ()\fC [virtual]\fR"
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Destroys the event. If it was posted, it will be removed from the list of events to be posted.
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.SH "bool QEvent::spontaneous () const"
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Returns TRUE if the event originated outside the application, i.e. it is a system event; otherwise returns FALSE.
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.SH "Type QEvent::type () const"
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Returns the event type.
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.SH "SEE ALSO"
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.BR http://doc.trolltech.com/ntqevent.html
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.BR http://www.trolltech.com/faq/tech.html
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.SH COPYRIGHT
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Copyright 1992-2007 Trolltech ASA, http://www.trolltech.com. See the
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license file included in the distribution for a complete license
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statement.
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.SH AUTHOR
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Generated automatically from the source code.
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.SH BUGS
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If you find a bug in Qt, please report it as described in
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.BR http://doc.trolltech.com/bughowto.html .
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Good bug reports help us to help you. Thank you.
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.P
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The definitive Qt documentation is provided in HTML format; it is
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located at $QTDIR/doc/html and can be read using Qt Assistant or with
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a web browser. This man page is provided as a convenience for those
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users who prefer man pages, although this format is not officially
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supported by Trolltech.
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.P
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If you find errors in this manual page, please report them to
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.BR qt-bugs@trolltech.com .
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Please include the name of the manual page (tqevent.3qt) and the Qt
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version (3.3.8).
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