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/*
* Copyright 2000-2016 Vaadin Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.vaadin.ui;
/**
* Component with layout measuring hint. Used to improve granularity of control
* over child component measurements.
*
* @since 7.6
* @author Vaadin Ltd
*/
public interface HasChildMeasurementHint extends HasComponents {
/**
* Specifies how you would like child components measurements to be handled.
* Since this is a hint, it can be ignored when deemed necessary.
*/
public enum ChildMeasurementHint {
/**
* Always measure all child components (default).
*/
MEASURE_ALWAYS,
/**
* Measure child component only if child component is a Layout or
* implements either ManagedLayout or ElementResizeListener.
*/
MEASURE_IF_NEEDED,
/**
* Never measure child components. This can improve rendering speed of
* components with lots of children (e.g. Table), but can cause some
* child components to be rendered incorrectly (e.g. ComboBox).
*/
MEASURE_NEVER
}
/**
* Sets desired child size measurement hint.
*
* @param hint
* desired hint. A value of null will reset value back to the
* default (MEASURE_ALWAYS)
*/
void setChildMeasurementHint(ChildMeasurementHint hint);
/**
* Returns the current child size measurement hint.
*
* @return a child measurement hint value
*/
ChildMeasurementHint getChildMeasurementHint();
}
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