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Groovy: A powerful, dynamic language for the JVM
/*
* 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.
*/
package groovy.ui
import java.awt.*
import java.awt.image.BufferedImage
import javax.swing.Icon
import javax.swing.ImageIcon
import org.codehaus.groovy.runtime.InvokerHelper
class OutputTransforms {
@Lazy static localTransforms = loadOutputTransforms()
static loadOutputTransforms() {
def transforms = []
//
// load user local transforms
//
def userHome = new File(System.getProperty('user.home'))
def groovyDir = new File(userHome, '.groovy')
def userTransforms = new File(groovyDir, "OutputTransforms.groovy")
if (userTransforms.exists()) {
GroovyShell shell = new GroovyShell()
shell.setVariable('transforms', transforms)
shell.evaluate(userTransforms)
}
//
// built-in transforms
//
// any non-window GUI components, such as a heavyweight button or a
// Swing component, gets passed if it has no parent set (the parent
// clause is to keep buttons from disappearing from user shown forms)
transforms << { it -> if ((it instanceof Component) && !(it instanceof Window) && (it.parent == null)) it }
// remaining components get printed to an image
transforms << { it ->
if (it instanceof javax.swing.JComponent) {
Dimension d = it.size
if (d.width == 0) {
d = it.preferredSize
it.size = d
}
GraphicsEnvironment ge = GraphicsEnvironment.localGraphicsEnvironment
GraphicsDevice gs = ge.defaultScreenDevice
GraphicsConfiguration gc = gs.defaultConfiguration
BufferedImage image = gc.createCompatibleImage(d.width as int, d.height as int, Transparency.TRANSLUCENT)
Graphics2D g2 = image.createGraphics()
it.print(g2)
g2.dispose()
new ImageIcon(image)
}
}
// icons get passed, they can be rendered multiple times so no parent check
transforms << { it -> if (it instanceof Icon) it }
// Images become ImageIcons
transforms << { it -> if (it instanceof Image) new ImageIcon(it)}
// final case, non-nulls just get inspected as strings
transforms << { it -> if (it != null) "${InvokerHelper.inspect(it)}" }
return transforms
}
static transformResult(base, transforms = localTransforms) {
for (Closure c : transforms) {
def result = c(base as Object)
if (result != null) {
return result
}
}
return base
}
}