Package org.eclipse.swt.internal

Class DPIZoomChangeRegistry

java.lang.Object

org.eclipse.swt.internal.DPIZoomChangeRegistry

public class DPIZoomChangeRegistry
extends Object

Constructor Summary

Constructors

Constructor	Description
DPIZoomChangeRegistry()

Method Summary

Modifier and Type	Method	Description
static void	applyChange(Widget widget, int newZoom, float scalingFactor)	Calling this method will propagate the zoom change to all registered handlers that are responsible for the class of the provided widget or one of its super classes or interfaces.
static void	registerHandler(DPIZoomChangeHandler zoomChangeVisitor, Class<? extends Widget> clazzToRegisterFor)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

DPIZoomChangeRegistry

public DPIZoomChangeRegistry()

Method Details

applyChange

public static void applyChange(Widget widget,
 int newZoom,
 float scalingFactor)

Calling this method will propagate the zoom change to all registered handlers that are responsible for the class of the provided widget or one of its super classes or interfaces. Usually there will be multiple handlers called per widget. To have a reliable and consistent execution order, the handler responsible for the most general class in the class hierarchy is called first, e.g. if a Composite is updated, the handlers are executed like (Widget -> Control -> Scrollable -> Composite). Each handler should only take care to update the attributes the class, it is registered for, adds to the hierarchy.

Parameters:

widget - widget the zoom change shall be applied to

newZoom - zoom in % of the standard resolution to be applied to the widget

scalingFactor - factor as division between new zoom and old zoom, e.g. 1.5 for a scaling from 100% to 150%

registerHandler

public static void registerHandler(DPIZoomChangeHandler zoomChangeVisitor,
 Class<? extends Widget> clazzToRegisterFor)