package org.apache.myfaces.tobago.internal.layout;
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
import org.apache.commons.lang.StringUtils;
import org.apache.myfaces.tobago.internal.component.AbstractUIGridLayout;
import org.apache.myfaces.tobago.layout.LayoutBase;
import org.apache.myfaces.tobago.layout.LayoutContainer;
import org.apache.myfaces.tobago.layout.LayoutManager;
import org.apache.myfaces.tobago.layout.Orientation;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import java.text.DecimalFormat;
/*
An algorithm for laying out ...
- get UIPage
- call compute-sizes
- get the LayoutManager
- go to the PX elements
- call compute-sizes (recursively)
- go to the Auto elements
- call compute-sizes (recursively)
- compute the max size of the elements and set it to the row/column
- check given size: if not set: warn
- calculate remainder = given size - all px sizes - all auto sizes
- go to the * elements
- partition remainder to this elements (3*;2*)
- call compute-sizes (recursively)
- call set-positions
- compute and set positions of columns/rows
- call set-positions for all elements (recursively)
todo: describe what happens, when there is a rendered=false (if all in one bank than collapse)
todo: describe what happens, when there are too less components (there a free space)
todo: describe what happens, when there are too much components (there a rows with * added)
*/
public class LayoutContext {
private static final Logger LOG = LoggerFactory.getLogger(LayoutContext.class);
private LayoutContainer container;
public LayoutContext(LayoutContainer container) {
this.container = container;
}
public void layout() {
long begin = 0;
if (LOG.isDebugEnabled()) {
begin = System.nanoTime();
}
LayoutManager layoutManager = container.getLayoutManager();
layoutManager.init();
layoutManager.fixRelativeInsideAuto(Orientation.HORIZONTAL, false);
layoutManager.fixRelativeInsideAuto(Orientation.VERTICAL, false);
layoutManager.preProcessing(Orientation.HORIZONTAL);
layoutManager.preProcessing(Orientation.VERTICAL);
layoutManager.mainProcessing(Orientation.HORIZONTAL);
layoutManager.mainProcessing(Orientation.VERTICAL);
layoutManager.postProcessing(Orientation.HORIZONTAL);
layoutManager.postProcessing(Orientation.VERTICAL);
if (LOG.isDebugEnabled()) {
LOG.debug("Laying out takes: {} ns", new DecimalFormat("#,##0").format(System.nanoTime() - begin));
}
log();
}
private void log() {
if (LOG.isDebugEnabled()) {
StringBuffer buffer = new StringBuffer("\n");
log(buffer, (UIComponent) container, 0);
LOG.debug(buffer.toString());
}
}
private void log(StringBuffer buffer, UIComponent component, int depth) {
FacesContext facesContext = FacesContext.getCurrentInstance();
buffer.append(StringUtils.repeat(" ", depth));
buffer.append(component.getClass().getSimpleName());
buffer.append("#");
buffer.append(component.getClientId(facesContext));
if (component instanceof LayoutBase) {
buffer.append("(");
buffer.append(((LayoutBase) component).getCurrentWidth());
buffer.append(", ");
buffer.append(((LayoutBase) component).getCurrentHeight());
buffer.append(")");
}
if (component instanceof LayoutContainer) {
LayoutManager layoutManager = ((LayoutContainer) component).getLayoutManager();
if (layoutManager instanceof AbstractUIGridLayout) {
buffer.append("\n");
buffer.append(StringUtils.repeat(" ", depth + 4));
buffer.append("layout: ");
buffer.append(((AbstractUIGridLayout) layoutManager).toString(depth));
}
}
buffer.append("\n");
for (Object child : component.getChildren()) {
log(buffer, (UIComponent) child, depth + 2);
}
}
}