Qt中事件过滤器eventFilter中所有枚举事件总结

Qt中事件过滤器一般是用在继承QObject的类中，但是更多的是用在继承QWidget的界面类中。在界面类中，一般用的最多的是鼠标和键盘事件，包括鼠标摁下、移入、移除、拖拽等。一般在鼠标做出相应动作时，系统就会自动发送对应事件，然后被事件过滤器捕获，从而执行逻辑业务代码。

注意：事件过滤器作用域只在该界面内有效；出了该界面，在该界面重写的事件过滤器无效！！！

也即是如果我在QPushbutton内重写的事件过滤器，只能捕获该QPushbutton的各类事件，不能捕获该按钮以外的事件！

下面代码是Qt事件过滤器中所有事件枚举类型QEvent::type定义：

enum Type {
/*
If you get a strange compiler error on the line with None,
it’s probably because you’re also including X11 headers,
which #define the symbol None. Put the X11 includes after
the Qt includes to solve this problem.
*/
None = 0, // invalid event
Timer = 1, // timer event
MouseButtonPress = 2, // mouse button pressed
MouseButtonRelease = 3, // mouse button released
MouseButtonDblClick = 4, // mouse button double click
MouseMove = 5, // mouse move
KeyPress = 6, // key pressed
KeyRelease = 7, // key released
FocusIn = 8, // keyboard focus received
FocusOut = 9, // keyboard focus lost
FocusAboutToChange = 23, // keyboard focus is about to be lost
Enter = 10, // mouse enters widget
Leave = 11, // mouse leaves widget
Paint = 12, // paint widget
Move = 13, // move widget
Resize = 14, // resize widget
Create = 15, // after widget creation
Destroy = 16, // during widget destruction
Show = 17, // widget is shown
Hide = 18, // widget is hidden
Close = 19, // request to close widget
Quit = 20, // request to quit application
ParentChange = 21, // widget has been reparented
ParentAboutToChange = 131, // sent just before the parent change is done
ThreadChange = 22, // object has changed threads
WindowActivate = 24, // window was activated
WindowDeactivate = 25, // window was deactivated
ShowToParent = 26, // widget is shown to parent
HideToParent = 27, // widget is hidden to parent
Wheel = 31, // wheel event
WindowTitleChange = 33, // window title changed
WindowIconChange = 34, // icon changed
ApplicationWindowIconChange = 35, // application icon changed
ApplicationFontChange = 36, // application font changed
ApplicationLayoutDirectionChange = 37, // application layout direction changed
ApplicationPaletteChange = 38, // application palette changed
PaletteChange = 39, // widget palette changed
Clipboard = 40, // internal clipboard event
Speech = 42, // reserved for speech input
MetaCall = 43, // meta call event
SockAct = 50, // socket activation
WinEventAct = 132, // win event activation
DeferredDelete = 52, // deferred delete event
DragEnter = 60, // drag moves into widget
DragMove = 61, // drag moves in widget
DragLeave = 62, // drag leaves or is cancelled
Drop = 63, // actual drop
DragResponse = 64, // drag accepted/rejected
ChildAdded = 68, // new child widget
ChildPolished = 69, // polished child widget
ChildRemoved = 71, // deleted child widget
ShowWindowRequest = 73, // widget’s window should be mapped
PolishRequest = 74, // widget should be polished
Polish = 75, // widget is polished
LayoutRequest = 76, // widget should be relayouted
UpdateRequest = 77, // widget should be repainted
UpdateLater = 78, // request update() later

    EmbeddingControl = 79,                  // ActiveX embeddingActivateControl = 80,                   // ActiveX activationDeactivateControl = 81,                 // ActiveX deactivationContextMenu = 82,                       // context popup menuInputMethod = 83,                       // input methodTabletMove = 87,                        // Wacom tablet eventLocaleChange = 88,                      // the system locale changedLanguageChange = 89,                    // the application language changedLayoutDirectionChange = 90,             // the layout direction changedStyle = 91,                             // internal style eventTabletPress = 92,                       // tablet pressTabletRelease = 93,                     // tablet releaseOkRequest = 94,                         // CE (Ok) button pressedHelpRequest = 95,                       // CE (?)  button pressedIconDrag = 96,                          // proxy icon draggedFontChange = 97,                        // font has changedEnabledChange = 98,                     // enabled state has changedActivationChange = 99,                  // window activation has changedStyleChange = 100,                      // style has changedIconTextChange = 101,                   // icon text has changed.  Deprecated.ModifiedChange = 102,                   // modified state has changedMouseTrackingChange = 109,              // mouse tracking state has changedWindowBlocked = 103,                    // window is about to be blocked modallyWindowUnblocked = 104,                  // windows modal blocking has endedWindowStateChange = 105,ReadOnlyChange = 106,                   // readonly state has changedToolTip = 110,WhatsThis = 111,StatusTip = 112,ActionChanged = 113,ActionAdded = 114,ActionRemoved = 115,FileOpen = 116,                         // file open requestShortcut = 117,                         // shortcut triggeredShortcutOverride = 51,                  // shortcut override requestWhatsThisClicked = 118,ToolBarChange = 120,                    // toolbar visibility toggledApplicationActivate = 121,              // deprecated. Use ApplicationStateChange instead.ApplicationActivated = ApplicationActivate, // deprecatedApplicationDeactivate = 122,            // deprecated. Use ApplicationStateChange instead.ApplicationDeactivated = ApplicationDeactivate, // deprecatedQueryWhatsThis = 123,                   // query what's this widget helpEnterWhatsThisMode = 124,LeaveWhatsThisMode = 125,ZOrderChange = 126,                     // child widget has had its z-order changedHoverEnter = 127,                       // mouse cursor enters a hover widgetHoverLeave = 128,                       // mouse cursor leaves a hover widgetHoverMove = 129,                        // mouse cursor move inside a hover widget// last event id used = 132

#ifdef QT_KEYPAD_NAVIGATION
EnterEditFocus = 150, // enter edit mode in keypad navigation
LeaveEditFocus = 151, // enter edit mode in keypad navigation
#endif
AcceptDropsChange = 152,

    ZeroTimerEvent = 154,                   // Used for Windows Zero timer eventsGraphicsSceneMouseMove = 155,           // GraphicsViewGraphicsSceneMousePress = 156,GraphicsSceneMouseRelease = 157,GraphicsSceneMouseDoubleClick = 158,GraphicsSceneContextMenu = 159,GraphicsSceneHoverEnter = 160,GraphicsSceneHoverMove = 161,GraphicsSceneHoverLeave = 162,GraphicsSceneHelp = 163,GraphicsSceneDragEnter = 164,GraphicsSceneDragMove = 165,GraphicsSceneDragLeave = 166,GraphicsSceneDrop = 167,GraphicsSceneWheel = 168,KeyboardLayoutChange = 169,             // keyboard layout changedDynamicPropertyChange = 170,            // A dynamic property was changed through setProperty/propertyTabletEnterProximity = 171,TabletLeaveProximity = 172,NonClientAreaMouseMove = 173,NonClientAreaMouseButtonPress = 174,NonClientAreaMouseButtonRelease = 175,NonClientAreaMouseButtonDblClick = 176,MacSizeChange = 177,                    // when the Qt::WA_Mac{Normal,Small,Mini}Size changesContentsRectChange = 178,               // sent by QWidget::setContentsMargins (internal)MacGLWindowChange = 179,                // Internal! the window of the GLWidget has changedFutureCallOut = 180,GraphicsSceneResize  = 181,GraphicsSceneMove  = 182,CursorChange = 183,ToolTipChange = 184,NetworkReplyUpdated = 185,              // Internal for QNetworkReplyGrabMouse = 186,UngrabMouse = 187,GrabKeyboard = 188,UngrabKeyboard = 189,MacGLClearDrawable = 191,               // Internal Cocoa, the window has changed, so we must clearStateMachineSignal = 192,StateMachineWrapped = 193,TouchBegin = 194,TouchUpdate = 195,TouchEnd = 196,

#ifndef QT_NO_GESTURES
NativeGesture = 197, // QtGui native gesture
#endif
RequestSoftwareInputPanel = 199,
CloseSoftwareInputPanel = 200,

    WinIdChange = 203,

#ifndef QT_NO_GESTURES
Gesture = 198,
GestureOverride = 202,
#endif
ScrollPrepare = 204,
Scroll = 205,

    Expose = 206,InputMethodQuery = 207,OrientationChange = 208,                // Screen orientation has changedTouchCancel = 209,ThemeChange = 210,SockClose = 211,                        // socket closedPlatformPanel = 212,StyleAnimationUpdate = 213,             // style animation target should be updatedApplicationStateChange = 214,WindowChangeInternal = 215,             // internal for QQuickWidgetScreenChangeInternal = 216,PlatformSurface = 217,                  // Platform surface created or about to be destroyedPointer = 218,                          // QQuickPointerEvent; ### Qt 6: QPointerEventTabletTrackingChange = 219,             // tablet tracking state has changed// 512 reserved for Qt Jambi's MetaCall event// 513 reserved for Qt Jambi's DeleteOnMainThread eventUser = 1000,                            // first user event idMaxUser = 65535                         // last user event id
}

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