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Groovy example source code file (GridBagFactory.groovy)

This example Groovy source code file (GridBagFactory.groovy) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Groovy tags/keywords

awt, component, gridbagconstraints, gridbagconstraints, gridbagfactory, gridbagfactory, gridbaglayout, gui, insets, map, number, number, object, object, rootpanecontainer, string, swing, util

The Groovy GridBagFactory.groovy source code

/*
 * Copyright 2007-2008 the original author or authors.
 *
 * 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 groovy.swing.factory

import groovy.util.FactoryBuilderSupport

import javax.swing.RootPaneContainer
import java.util.Map
import java.awt.Insets
import java.awt.GridBagConstraints
import java.awt.Container
import java.awt.GridBagLayout
import java.awt.Component

public class GridBagFactory extends LayoutFactory {

    public GridBagFactory() {
        super(GridBagLayout, true)
    }

    public void addLayoutProperties(context) {
        addLayoutProperties(context, GridBagConstraints)
    }



    public static void processGridBagConstraintsAttributes(FactoryBuilderSupport builder, Object node, Map attributes) {
        // if we are not a component, don't do anything
        if (!(node instanceof Component)) {
            return
        }
        // an explicit constraints means don't do anything
        def constraintsAttr = builder?.context?.getAt(LayoutFactory.DELEGATE_PROPERTY_CONSTRAINT) ?: LayoutFactory.DEFAULT_DELEGATE_PROPERTY_CONSTRAINT
        if (attributes.containsKey(constraintsAttr)) {
            return
        }
        // if there are cached constraints, don't do it again, we need to be idempotent...
        if (builder.getContext().containsKey("constraints")) {
            return
        }


        // next, check to be sure we are in an appropriate container
        Object parent = builder.getCurrent()
        if (parent instanceof RootPaneContainer) {
            if (!(((RootPaneContainer)parent).getContentPane().getLayout() instanceof GridBagLayout)) {
                return
            }
        } else if (parent instanceof Container) {
            if (!(((Container)parent).getLayout() instanceof GridBagLayout)) {
                return
            }
        } else {
            return
        }

        // next, look for matching attrs.
        boolean anyAttrs = false
        GridBagConstraints gbc = new GridBagConstraints()
        Object o

        o = extractAttribute(attributes, "gridx", Number)
        if (o != null) {
            gbc.gridx = o
            anyAttrs = true
        }
        o = extractAttribute(attributes, "gridy", Number)
        if (o != null) {
            gbc.gridy = o
            anyAttrs = true
        }
        o = extractAttribute(attributes, "gridwidth", Number)
        if (o != null) {
            gbc.gridwidth = o
            anyAttrs = true
        }
        o = extractAttribute(attributes, "gridheight", Number)
        if (o != null) {
            gbc.gridheight = o
            anyAttrs = true
        }

        o = extractAttribute(attributes, "weightx", Number)
        if (o != null) {
            gbc.weightx = o
            anyAttrs = true
        }
        o = extractAttribute(attributes, "weighty", Number)
        if (o != null) {
            gbc.weighty = o
            anyAttrs = true
        }

        o = extractAttribute(attributes, "anchor", Number)
        if (o != null) {
            gbc.anchor = o
            anyAttrs = true
        }
        o = extractAttribute(attributes, "fill", Number)
        if (o != null) {
            gbc.fill = o
            anyAttrs = true
        }

        o = extractAttribute(attributes, "insets", Object)
        if (o != null) {
            gbc.insets = o as Insets
            anyAttrs = true
        }

        o = extractAttribute(attributes, "ipadx", Number)
        if (o != null) {
            gbc.ipadx = o
            anyAttrs = true
        }
        o = extractAttribute(attributes, "ipady", Number)
        if (o != null) {
            gbc.ipady = o
            anyAttrs = true
        }

        // if we find any attrs, stash the constraints
        if (anyAttrs) {
            builder.getContext().put("constraints", gbc)
        }
    }

    /**
     * @return null if not found.
     * null as a 'not found' works because all attrs except insets
     * are primitive types, and insets will crash if set to null
     */
    static Object extractAttribute(Map attrs, String name, Class type) {
        if (attrs.containsKey(name)) {
            Object o = attrs.get(name)
            if ((o != null) && type.isAssignableFrom(type)) {
                attrs.remove(name)
                return o
            } else {
                return null
            }
        } else {
            return null
        }
    }
}

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