10.10.2 ConfigureNotify

The X server can report ConfigureNotify events to clients wanting information about actual changes to a window's state, such as size, position, border, and stacking order. The X server generates this event type whenever one of the following configure window requests made by a client application actually completes:

• A window's size, position, border, and/or stacking order is reconfigured by calling XConfigureWindow().
• The window's position in the stacking order is changed by calling XLowerWindow(), XRaiseWindow(), or XRestackWindows().
• A window is moved by calling XMoveWindow().
• A window's size is changed by calling XResizeWindow().
• A window's size and location is changed by calling XMoveResizeWindow().
• A window is mapped and its position in the stacking order is changed by calling XMapRaised().
• A window's border width is changed by calling XSetWindowBorderWidth().

To receive ConfigureNotify events, set the StructureNotifyMask bit in the event-mask attribute of the window or the SubstructureNotifyMask bit in the event-mask attribute of the parent window (in which case, configuring any child generates an event).

The structure for this event type contains:

typedef struct {
	int type;	        /* ConfigureNotify */
	unsigned long serial;	/* # of last request processed by server */
	Bool send_event;	/* true if this came from a SendEvent request */
	Display *display;	/* Display the event was read from */
	Window event;
	Window window;
	int x, y;
	int width, height;
	int border_width;
	Window above;
	Bool override_redirect;
} XConfigureEvent;

The event member is set either to the reconfigured window or to its parent, depending on whether StructureNotify or SubstructureNotify was selected. The window member is set to the window whose size, position, border, and/or stacking order was changed.

The x and y members are set to the coordinates relative to the parent window's origin and indicate the position of the upper-left outside corner of the window. The width and height members are set to the inside size of the window, not including the border. The border_width member is set to the width of the window's border, in pixels.

The above member is set to the sibling window and is used for stacking operations. If the X server sets this member to None , the window whose state was changed is on the bottom of the stack with respect to sibling windows. However, if this member is set to a sibling window, the window whose state was changed is placed on top of this sibling window.

The override_redirect member is set to the override-redirect attribute of the window. Window manager clients normally should ignore this window if the override_redirect member is True.

Next: CreateNotify Events

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Christophe Tronche, [email protected]