Package icyllis.modernui.view

Interface ViewTreeObserver.OnPreDrawListener

All Known Implementing Classes:

Button, CheckBox, CompoundButton, EditText, MaterialCheckBox, MaterialRadioButton, OneShotPreDrawListener, RadioButton, Switch, SwitchButton, TextView, ToggleButton

Enclosing class:

ViewTreeObserver

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public static interface ViewTreeObserver.OnPreDrawListener

Interface definition for a callback to be invoked when the view tree is about to be drawn.

Method Summary

Modifier and Type	Method	Description
boolean	onPreDraw()	Callback method to be invoked when the view tree is about to be drawn.

Method Details

onPreDraw

boolean onPreDraw()

Callback method to be invoked when the view tree is about to be drawn. At this point, all views in the tree have been measured and given a frame. Clients can use this to adjust their scroll bounds or even to request a new layout before drawing occurs.

Returns:

Return true to proceed with the current drawing pass, or false to cancel.

See Also:

• View.onMeasure(int, int)
• View.onLayout(boolean, int, int, int, int)
• View.onDraw(icyllis.modernui.graphics.Canvas)