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/*
* Copyright 2000-2014 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;
import org.jsoup.nodes.Element;
import com.vaadin.shared.ui.AbstractLayoutState;
import com.vaadin.shared.ui.MarginInfo;
import com.vaadin.ui.declarative.DesignAttributeHandler;
import com.vaadin.ui.declarative.DesignContext;
/**
* An abstract class that defines default implementation for the {@link Layout}
* interface.
*
* @author Vaadin Ltd.
* @since 5.0
*/
public abstract class AbstractLayout extends AbstractComponentContainer
implements Layout {
@Override
protected AbstractLayoutState getState() {
return (AbstractLayoutState) super.getState();
}
/**
* Reads margin attributes from a design into a MarginInfo object. This
* helper method should be called from the
* {@link #readDesign(Element, DesignContext) readDesign} method of layouts
* that implement {@link MarginHandler}.
*
* @since 7.5
*
* @param design
* the design from which to read
* @param defMargin
* the default margin state for edges that are not set in the
* design
* @param context
* the DesignContext instance used for parsing the design
* @return the margin info
*/
protected MarginInfo readMargin(Element design, MarginInfo defMargin,
DesignContext context) {
if (design.hasAttr("margin")) {
boolean margin = DesignAttributeHandler.readAttribute("margin",
design.attributes(), boolean.class);
return new MarginInfo(margin);
} else {
boolean left = DesignAttributeHandler.readAttribute("margin-left",
design.attributes(), defMargin.hasLeft(), boolean.class);
boolean right = DesignAttributeHandler.readAttribute(
"margin-right", design.attributes(), defMargin.hasRight(),
boolean.class);
boolean top = DesignAttributeHandler.readAttribute("margin-top",
design.attributes(), defMargin.hasTop(), boolean.class);
boolean bottom = DesignAttributeHandler.readAttribute(
"margin-bottom", design.attributes(),
defMargin.hasBottom(), boolean.class);
return new MarginInfo(top, right, bottom, left);
}
}
/**
* Writes margin attributes from a MarginInfo object to a design. This
* helper method should be called from the
* {@link #readDesign(Element, DesignContext) writeDesign} method of layouts
* that implement {@link MarginHandler}.
*
*
* @since 7.5
*
* @param design
* the design to write to
* @param margin
* the margin state to write
* @param defMargin
* the default margin state to compare against
* @param context
* the DesignContext instance used for parsing the design
*/
protected void writeMargin(Element design, MarginInfo margin,
MarginInfo defMargin, DesignContext context) {
if (margin.hasAll()) {
DesignAttributeHandler.writeAttribute("margin",
design.attributes(), margin.hasAll(), defMargin.hasAll(),
boolean.class);
} else {
DesignAttributeHandler.writeAttribute("margin-left",
design.attributes(), margin.hasLeft(), defMargin.hasLeft(),
boolean.class);
DesignAttributeHandler.writeAttribute("margin-right",
design.attributes(), margin.hasRight(),
defMargin.hasRight(), boolean.class);
DesignAttributeHandler.writeAttribute("margin-top",
design.attributes(), margin.hasTop(), defMargin.hasTop(),
boolean.class);
DesignAttributeHandler.writeAttribute("margin-bottom",
design.attributes(), margin.hasBottom(),
defMargin.hasBottom(), boolean.class);
}
}
}
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