This interface lets you get information about the display screen (or screens) attached to the user's computer.
28
Introduced
Gecko 0.9.5
Inherits from:
nsISupports
Last changed in Gecko 1.9 (Firefox 3)Implemented by: @mozilla.org/gfx/screenmanager;1 as a service:
var screenManager = Components.classes["@mozilla.org/gfx/screenmanager;1"]
.getService(Components.interfaces.nsIScreenManager);
Method overview
nsIScreen screenForNativeWidget( in voidPtr nativeWidget ); Native code only! |
nsIScreen screenForRect( in long left, in long top, in long width, in long height ); |
Attributes
| Attribute | Type | Description |
numberOfScreens | unsigned long | The number of screens on the user's computer. Read only. |
primaryScreen | | The primary display screen; this is the screen with the menu bar (on the Mac) or taskbar or equivalent on Windows or Linux. Read only. |
Methods
Native code only!
screenForNativeWidget
Returns the nsIScreen instance for the native widget pointer. This pointer's definition is specific to the platform's native widget implementation, and is typically of the same type as NS_NATIVE_WINDOW.
nsIScreen screenForNativeWidget( in voidPtr nativeWidget );
Parameters
nativeWidget- The native widget for which to obtain an
nsIScreeninstance.
Return value
The nsIScreen instance for the native widget pointer.
screenForRect()
Returns the nsIScreen containing the specified rectangle. If the rectangle overlaps multiple screens, the screen containing the majority of the rectangle's area is selected and returned.
The coordinates must be specified using global (screen) coordinates, and are in pixels.
nsIScreen screenForRect( in long left, in long top, in long width, in long height );
Parameters
left- The left edge of the rectangle.
top- The top edge of the rectangle.
width- The width of the rectangle.
height- The height of the rectangle.
Return value
The nsIScreen containing the majority of the rectangle's area.