gdk-Events: Events

Description Methods and Functions Detailed Description Enums and Flags User Functions Author(s) References

Description

Functions for handling events from the window system

Methods and Functions

gdkEventsPending()
gdkEventPeek()
gdkEventGet()
gdkEventGetGraphicsExpose(window)
gdkEventPut(object)
gdkEventNew(type)
gdkEventCopy(object)
gdkEventGetTime(object)
gdkEventGetState(object)
gdkEventGetAxis(object, axis.use)
gdkEventGetCoords(object)
gdkEventGetRootCoords(object)
gdkEventRequestMotions(event)
gdkEventHandlerSet(func, data)
gdkAddClientMessageFilter(message.type, func, data)
gdkGetShowEvents()
gdkSetShowEvents(show.events)
gdkEventSetScreen(object, screen)
gdkEventGetScreen(object)
gdkSettingGet(name)

Detailed Description

This section describes functions dealing with events from the window system.

In GTK+ applications the events are handled automatically in gtkMainDoEvent and passed on to the appropriate widgets, so these functions are rarely needed. Though some of the fields in the Event Structures are useful.

Enums and Flags

GdkEventType

Specifies the type of the event.

Do not confuse these events with the signals that GTK+ widgets emit. Although many of these events result in corresponding signals being emitted, the events are often transformed or filtered along the way.

nothing

a special code to indicate a null event.

delete

the window manager has requested that the toplevel window be hidden or destroyed, usually when the user clicks on a special icon in the title bar.

destroy

the window has been destroyed.

expose

all or part of the window has become visible and needs to be redrawn.

motion-notify

the pointer (usually a mouse) has moved.

button-press

a mouse button has been pressed.

2button-press

a mouse button has been double-clicked (clicked twice within a short period of time). Note that each click also generates a GDK_BUTTON_PRESS event.

3button-press

a mouse button has been clicked 3 times in a short period of time. Note that each click also generates a GDK_BUTTON_PRESS event.

button-release

a mouse button has been released.

key-press

a key has been pressed.

key-release

a key has been released.

enter-notify

the pointer has entered the window.

leave-notify

the pointer has left the window.

focus-change

the keyboard focus has entered or left the window.

configure

the size, position or stacking order of the window has changed. Note that GTK+ discards these events for GDK_WINDOW_CHILD windows.

map

the window has been mapped.

unmap

the window has been unmapped.

property-notify

a property on the window has been changed or deleted.

selection-clear

the application has lost ownership of a selection.

selection-request

another application has requested a selection.

selection-notify

a selection has been received.

proximity-in

an input device has moved into contact with a sensing surface (e.g. a touchscreen or graphics tablet).

proximity-out

an input device has moved out of contact with a sensing surface.

drag-enter

the mouse has entered the window while a drag is in progress.

drag-leave

the mouse has left the window while a drag is in progress.

drag-motion

the mouse has moved in the window while a drag is in progress.

drag-status

the status of the drag operation initiated by the window has changed.

drop-start

a drop operation onto the window has started.

drop-finished

the drop operation initiated by the window has completed.

client-event

a message has been received from another application.

visibility-notify

the window visibility status has changed.

no-expose

indicates that the source region was completely available when parts of a drawable were copied. This is not very useful.

scroll

the scroll wheel was turned

window-state

the state of a window has changed. See GdkWindowState for the possible window states

setting

a setting has been modified.

owner-change

the owner of a selection has changed. This event type was added in 2.6

grab-broken

a pointer or keyboard grab was broken. This event type was added in 2.8.

gdk-damage

the content of the window has been changed. This event type was added in 2.14.

GdkEventMask

A set of bit-flags to indicate which events a window is to receive. Most of these masks map onto one or more of the GdkEventType event types above. GDK_POINTER_MOTION_HINT_MASK is a special mask which is used to reduce the number of GDK_MOTION_NOTIFY events received. Normally a GDK_MOTION_NOTIFY event is received each time the mouse moves. However, if the application spends a lot of time processing the event (updating the display, for example), it can lag behind the position of the mouse. When using GDK_POINTER_MOTION_HINT_MASK, fewer GDK_MOTION_NOTIFY events will be sent, some of which are marked as a hint (the is_hint member is TRUE). To receive more motion events after a motion hint event, the application needs to asks for more, by calling gdkEventRequestMotions.

exposure-mask

receive expose events

pointer-motion-mask

receive all pointer motion events

pointer-motion-hint-mask

see the explanation above

button-motion-mask

receive pointer motion events while any button is pressed

button1-motion-mask

receive pointer motion events while 1 button is pressed

button2-motion-mask

receive pointer motion events while 2 button is pressed

button3-motion-mask

receive pointer motion events while 3 button is pressed

button-press-mask

receive button press events

button-release-mask

receive button release events

key-press-mask

receive key press events

key-release-mask

receive key release events

enter-notify-mask

receive window enter events

leave-notify-mask

receive window leave events

focus-change-mask

receive focus change events

structure-mask

receive events about window configuration change

property-change-mask

receive property change events

visibility-notify-mask

receive visibility change events

proximity-in-mask

receive proximity in events

proximity-out-mask

receive proximity out events

substructure-mask

receive events about window configuration changes of child windows

scroll-mask

receive scroll events

all-events-mask

the combination of all the above event masks.

User Functions

GdkEventFunc(event, data)

Specifies the type of function passed to gdkEventHandlerSet to handle all GDK events.

event

the GdkEvent to process.

data

user data set when the event handler was installed with gdkEventHandlerSet.

Author(s)

Derived by RGtkGen from GTK+ documentation

References

https://developer.gnome.org/gdk2/stable/gdk2-Events.html


RGtk2 documentation built on June 12, 2018, 5:06 p.m.