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<title>The Python X Library: 5.2 Selecting Events</title>
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<a name="Selecting-Events"></a>
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<a name="Selecting-Events-1"></a>
<h2 class="section">5.2 Selecting Events</h2>
<p>To avoid flooding the clients with events in which they have no
interest, they must explicitly tell the server which events they are
interested in. This is done by providing the <code>event_mask</code>
attribute when creating windows with <code>Window.create_window</code> or in
calls to <code>Window.change_attributes</code>. The value of this attribute
is a mask of all types of events the client is interested in on that
particular window. Whenever the server generates an event for a window
which matches the clients event mask on that window, the event will be
sent to the client.
</p>
<p>The following table lists all event masks and the corresponding event
types and classes. All event masks and types are integer constants
defined in the module <code>Xlib.X</code>. Classes have the same name as the
event type, and are defined in <code>Xlib.protocol.event</code>.
</p>
<table>
<tr><td><strong>Mask</strong></td><td><strong>Type and Class</strong></td><td><strong>Generated when</strong></td></tr>
<tr><td>ButtonMotionMask <br> Button1MotionMask <br> Button2MotionMask <br> Button3MotionMask <br> Button4MotionMask <br> Button5MotionMask</td><td>MotionNotify</td><td>Pointer moved with any or a certain button down</td></tr>
<tr><td></td><td></td><td></td></tr>
<tr><td>ButtonPressMask</td><td>ButtonPress</td><td>Pointer button pressed</td></tr>
<tr><td>ButtonReleaseMask</td><td>ButtonRelease</td><td>Pointer button released</td></tr>
<tr><td></td><td></td><td></td></tr>
<tr><td>ColormapChangeMask</td><td>ColormapNotify</td><td>Colormap changed or installed</td></tr>
<tr><td></td><td></td><td></td></tr>
<tr><td>EnterWindowMask</td><td>EnterNotify</td><td>Pointer enters window</td></tr>
<tr><td>LeaveWindowMask</td><td>LeaveNotify</td><td>Pointer leaves window</td></tr>
<tr><td></td><td></td><td></td></tr>
<tr><td>ExposureMask</td><td>Expose <br> NoExpose</td><td>Window needs to be redrawn</td></tr>
<tr><td></td><td></td><td></td></tr>
<tr><td>FocusChangeMask</td><td>FocusIn <br> FocusOut</td><td>Focus changes</td></tr>
<tr><td>KeymapStateMask</td><td>KeymapNotify</td><td>After EnterNotify and FocusIn</td></tr>
<tr><td></td><td></td><td></td></tr>
<tr><td>KeyPressMask</td><td>KeyPress</td><td>Key is pressed</td></tr>
<tr><td>KeyReleaseMask</td><td>ReleasePress</td><td>Key is released</td></tr>
<tr><td></td><td></td><td></td></tr>
<tr><td>PointerMotionMask</td><td>MotionNotify</td><td>Pointer is moved</td></tr>
<tr><td></td><td></td><td></td></tr>
<tr><td>PropertyChangeMask</td><td>PropertyNotify</td><td>Window properties change</td></tr>
<tr><td></td><td></td><td></td></tr>
<tr><td>StructureNotifyMask</td><td>CirculateNotify <br>
ConfigureNotify <br>
DestroyNotify <br>
GravityNotify <br>
MapNotify <br>
ReparentNotify <br>
UnmapNotify</td><td>Window structure changes</td></tr>
<tr><td></td><td></td><td></td></tr>
<tr><td>SubstructureNotifyMask</td><td>CirculateNotify <br>
ConfigureNotify <br>
CreateNotify <br>
DestroyNotify <br>
GravityNotify <br>
MapNotify <br>
ReparentNotify <br>
UnmapNotify</td><td>Child window structure changes</td></tr>
<tr><td></td><td></td><td></td></tr>
<tr><td>ResizeRedirectMask</td><td>ResizeRequest</td><td>Controlling window size change</td></tr>
<tr><td></td><td></td><td></td></tr>
<tr><td>SubstructureRedirectMask</td><td>CirculateRequest <br>
ConfigureRequest <br>
MapRequest</td><td>Controlling changes to child windows</td></tr>
<tr><td></td><td></td><td></td></tr>
<tr><td>VisibilityChangeMask</td><td>VisibilityNotify</td><td>Window is obscured or visible</td></tr>
</table>
<p>There are also some event types which are always sent to the clients,
regardless of any event masks:
</p>
<table>
<tr><td><strong>Type and Class</strong></td><td><strong>Cut’n’pasting between windows</strong></td></tr>
<tr><td>ClientMessage</td><td>Other client sends message</td></tr>
<tr><td></td><td></td></tr>
<tr><td>MappingMotify</td><td>Keyboard mapping changes</td></tr>
<tr><td></td><td></td></tr>
<tr><td>SelectionClear <br>
SelectionNotify <br>
SelectionRequest</td><td>Cut’n’pasting between windows</td></tr>
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