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/*
* Copyright 2011 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.terminal;
import java.io.Serializable;
import com.vaadin.terminal.PaintTarget.PaintStatus;
import com.vaadin.ui.Component;
import com.vaadin.ui.HasComponents;
public class LegacyPaint implements Serializable {
/**
*
* <p>
* Paints the Paintable into a UIDL stream. This method creates the UIDL
* sequence describing it and outputs it to the given UIDL stream.
* </p>
*
* <p>
* It is called when the contents of the component should be painted in
* response to the component first being shown or having been altered so
* that its visual representation is changed.
* </p>
*
* <p>
* <b>Do not override this to paint your component.</b> Override
* {@link #paintContent(PaintTarget)} instead.
* </p>
*
*
* @param target
* the target UIDL stream where the component should paint itself
* to.
* @throws PaintException
* if the paint operation failed.
*/
public static void paint(Component component, PaintTarget target)
throws PaintException {
// Only paint content of visible components.
if (!isVisibleInContext(component)) {
return;
}
final String tag = target.getTag(component);
final PaintStatus status = target.startPaintable(component, tag);
if (PaintStatus.CACHED == status) {
// nothing to do but flag as cached and close the paintable tag
target.addAttribute("cached", true);
} else {
// Paint the contents of the component
if (component instanceof Vaadin6Component) {
((Vaadin6Component) component).paintContent(target);
}
}
target.endPaintable(component);
}
/**
* Checks if the component is visible and its parent is visible,
* recursively.
* <p>
* This is only a helper until paint is moved away from this class.
*
* @return
*/
protected static boolean isVisibleInContext(Component c) {
HasComponents p = c.getParent();
while (p != null) {
if (!p.isVisible()) {
return false;
}
p = p.getParent();
}
if (c.getParent() != null && !c.getParent().isComponentVisible(c)) {
return false;
}
// All parents visible, return this state
return c.isVisible();
}
}
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