Enumeration
AtspiComponentLayer
Description [src]
The AtspiComponentLayer of an AtspiComponent instance indicates its
relative stacking order with respect to the onscreen visual representation
of the UI. AtspiComponentLayer, in combination with AtspiComponent bounds
information, can be used to compute the visibility of all or part of a
component. This is important in programmatic determination of
region-of-interest for magnification, and in
flat screen review models of the screen, as well as
for other uses. Objects residing in two of the AtspiComponentLayer
categories support further z-ordering information, with respect to their
peers in the same layer: namely, ATSPI_LAYER_WINDOW and
ATSPI_LAYER_MDI. Relative stacking order for other objects within the
same layer is not available; the recommended heuristic is
first child paints first. In other words, assume that the
first siblings in the child list are subject to being overpainted by later
siblings if their bounds intersect. The order of layers, from bottom to top,
is: ATSPI_LAYER_BACKGROUND, ATSPI_LAYER_WINDOW, ATSPI_LAYER_MDI,
ATSPI_LAYER_CANVAS, ATSPI_LAYER_WIDGET, ATSPI_LAYER_POPUP, and
ATSPI_LAYER_OVERLAY.
Members
-
ATSPI_LAYER_INVALID -
Indicates an error condition or uninitialized value.
- Value:
0 - Available since: 2.0
- Value:
-
ATSPI_LAYER_BACKGROUND -
The bottom-most layer, over which everything else is painted. The ‘desktop background’ is generally in this layer.
- Value:
1 - Available since: 2.0
- Value:
-
ATSPI_LAYER_CANVAS -
The ‘background’ layer for most content renderers and UI
AtspiComponentcontainers.- Value:
2 - Available since: 2.0
- Value:
-
ATSPI_LAYER_WIDGET -
The layer in which the majority of ordinary ‘foreground’ widgets reside.
- Value:
3 - Available since: 2.0
- Value:
-
ATSPI_LAYER_MDI -
A special layer between
ATSPI_LAYER_CANVASandATSPI_LAYER_WIDGET, in which the ‘pseudo windows’ (e.g. the MDI frames) reside. See #atspi_component_get_mdi_z_order.- Value:
4 - Available since: 2.0
- Value:
-
ATSPI_LAYER_POPUP -
A layer for popup window content, above
ATSPI_LAYER_WIDGET.- Value:
5 - Available since: 2.0
- Value:
-
ATSPI_LAYER_OVERLAY -
The topmost layer.
- Value:
6 - Available since: 2.0
- Value:
-
ATSPI_LAYER_WINDOW -
The layer in which a toplevel window background usually resides.
- Value:
7 - Available since: 2.0
- Value:
-
ATSPI_LAYER_LAST_DEFINED -
Used only to determine the end of the enumeration.
- Value:
8 - Available since: 2.0
- Value: