Question

这个问题Java Swing: Vertical Layout with fixed width and variable height让我有机会尝试Apache Pivot。我有一天与Pivot的经历。

这是我能够创建的GUI。

Segments GUI

我的问题是：

如何调整TextArea Expander的大小，以便Expander，ScrollPane和TextArea填充宽度窗口，TextArea高到足以容纳任意数量的文字？
如何调整ScrollPane Expander的高度，以便在展开所有文本区域时，3 Expander符合import java.io.IOException; import java.io.Reader; import java.io.StringReader; import java.util.ArrayList; import java.util.List; import org.apache.pivot.collections.Map; import org.apache.pivot.wtk.Application; import org.apache.pivot.wtk.BoxPane; import org.apache.pivot.wtk.DesktopApplicationContext; import org.apache.pivot.wtk.Display; import org.apache.pivot.wtk.Expander; import org.apache.pivot.wtk.Orientation; import org.apache.pivot.wtk.ScrollPane; import org.apache.pivot.wtk.TextArea; import org.apache.pivot.wtk.Window; public class Segments implements Application { protected SectionCollection collection; protected Window window; @Override public void startup(Display display, Map<String, String> properties) { collection = new SectionCollection(); new SectionCollectionCreator(collection); window = new Window(); window.setTitle("Segments"); window.setMaximized(true); BoxPane boxPane = new BoxPane(); boxPane.setOrientation(Orientation.VERTICAL); for (int i = 0; i < collection.size(); i++) { SectionText sectionText = collection.get(i); TextArea textArea = new TextArea(); textArea.setEditable(false); textArea.setPreferredSize(400, 220); try { textArea.setText(sectionText.getTopic()); } catch (IOException e) { e.printStackTrace(); } ScrollPane textScrollPane = new ScrollPane(); textScrollPane.setPreferredSize(420, 100); textScrollPane.setVerticalScrollBarPolicy( ScrollPane.ScrollBarPolicy.AUTO); textScrollPane.setView(textArea); Expander expander = new Expander(); expander.setTitle(sectionText.getTitle()); expander.setContent(textScrollPane); expander.setExpanded(false); boxPane.add(expander); } ScrollPane expanderScrollPane = new ScrollPane(); expanderScrollPane.setHorizontalScrollBarPolicy( ScrollPane.ScrollBarPolicy.AUTO); expanderScrollPane.setVerticalScrollBarPolicy( ScrollPane.ScrollBarPolicy.AUTO); expanderScrollPane.setView(boxPane); window.setContent(expanderScrollPane); window.open(display); } @Override public boolean shutdown(boolean optional) { if (window != null) { window.close(); } return false; } @Override public void suspend() { } @Override public void resume() { } public static void main(String[] args) { DesktopApplicationContext.main(Segments.class, args); } public class SectionText { protected String title; protected Reader topic; public SectionText(String title, Reader topic) { this.title = title; this.topic = topic; } public String getTitle() { return title; } public Reader getTopic() { return topic; } } public class SectionCollection { protected List<SectionText> collection; public SectionCollection() { this.collection = new ArrayList<SectionText>(); } public void add(SectionText sectionText) { collection.add(sectionText); } public int size() { return collection.size(); } public SectionText get(int index) { return collection.get(index); } } public class SectionCollectionCreator { protected SectionCollection collection; protected static final String text = "Attributes, Styles and Style Contexts\n\n" + "The simple PlainDocument class that you saw in the previous " + "chapter is only capable of holding text. The more complex text " + "components use a more sophisticated model that implements the " + "StyledDocument interface. StyledDocument is a sub-interface of " + "Document that contains methods for manipulating attributes that " + "control the way in which the text in the document is displayed. " + "The Swing text package contains a concrete implementation of " + "StyledDocument called DefaultStyledDocument that is used as the " + "default model for JTextPane and is also the base class from which " + "more specific models, such as the HTMLDocument class that handles " + "input in HTML format, can be created. In order to make use of " + "DefaultStyledDocument and JTextPane, you need to understand how " + "Swing represents and uses attributes."; public SectionCollectionCreator(SectionCollection collection) { this.collection = collection; String title = "Title "; for (int i = 1; i <= 3; i++) { SectionText sectionText = new SectionText(title + i, new StringReader(text)); collection.add(sectionText); } } } }的高度窗口？

以下是创建GUI的源代码。我正在使用Apache Pivot 2.0.2版。

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Answer 1

我终于解开了这个难题。

通过设置文本区域的宽度，计算高度以适合文本。

通过设置文本区域滚动窗格的高度，我可以显示文本区域滚动窗格，并将扩展器的大小减小到标题栏和文本区域滚动窗格。

所以现在，我所要做的就是根据窗口的宽度和高度计算出文本区域的宽度和文本区域滚动窗格的高度。

这就是组件监听器发挥作用的地方。侦听器调整了文本区域的宽度和文本区域滚动窗格的高度。我作弊并使用魔术常量来计算滚动条和边距。如果我在创建组件时能够获得这些值，那就太好了。

无论如何，这是将GUI组件调整到窗口的代码。

import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;

import org.apache.pivot.collections.Map;
import org.apache.pivot.wtk.Application;
import org.apache.pivot.wtk.Bounds;
import org.apache.pivot.wtk.BoxPane;
import org.apache.pivot.wtk.Component;
import org.apache.pivot.wtk.Component.StyleDictionary;
import org.apache.pivot.wtk.ComponentListener;
import org.apache.pivot.wtk.DesktopApplicationContext;
import org.apache.pivot.wtk.Display;
import org.apache.pivot.wtk.Expander;
import org.apache.pivot.wtk.Orientation;
import org.apache.pivot.wtk.ScrollPane;
import org.apache.pivot.wtk.TextArea;
import org.apache.pivot.wtk.Window;

public class Segments implements Application {

    protected List<SectionComponent> expanderComponents;

    protected SectionCollection collection;

    protected Window window;

    @Override
    public void startup(Display display, Map<String, String> properties) 
            throws IOException {
        getStyles(display);

        collection = new SectionCollection();
        new SectionCollectionCreator(collection);
        expanderComponents = new ArrayList<SectionComponent>();

        window = new Window();
        window.setTitle("Segments");
        window.setMaximized(true);

        ComponentSizeListener listener = new ComponentSizeListener();   
        window.getComponentListeners().add(listener.getListener());

        BoxPane boxPane = new BoxPane();
        boxPane.setOrientation(Orientation.VERTICAL);

        for (int i = 0; i < collection.size(); i++) {
            SectionComponent sectionComponent =
                    new SectionComponent(collection.get(i), 400, 100); 
            expanderComponents.add(sectionComponent);
            boxPane.add(sectionComponent.getExpander());
        }

        listener.setComponents(expanderComponents);

        ScrollPane expanderScrollPane = new ScrollPane();
        expanderScrollPane.setHorizontalScrollBarPolicy(
                ScrollPane.ScrollBarPolicy.AUTO);
        expanderScrollPane.setVerticalScrollBarPolicy(
                ScrollPane.ScrollBarPolicy.AUTO);
        expanderScrollPane.setView(boxPane);

        window.setContent(expanderScrollPane);
        window.open(display);
    }

    protected void getStyles(Component component) {
        StyleDictionary dictionary = component.getStyles();
        System.out.println(component);
        Iterator<String> iter = dictionary.iterator();
        List<String> list = new ArrayList<String>();
        while (iter.hasNext()) {
            list.add(iter.next());
        }
        Collections.sort(list);
        for (String style : list) {
            System.out.println("    " + style);
        }
    }

    @Override
    public boolean shutdown(boolean optional) {
        if (window != null) {
            window.close();
        }
        return false;
    }

    @Override
    public void suspend() {
        Bounds bounds = window.getClientArea();
        System.out.println(bounds);
    }

    @Override
    public void resume() {
    }

    public static void main(String[] args) {
        DesktopApplicationContext.main(Segments.class, args);
    }

    public class ComponentSizeListener {
        protected int newWidth;
        protected int newHeight;

        protected ComponentListener listener;

        protected List<SectionComponent> components;

        public ComponentSizeListener() {
            this.newWidth = 425;
            this.newHeight = 131;

            this.listener = new ComponentListener.Adapter() {
                @Override
                public void sizeChanged(Component component, 
                        int previousWidth, int previousHeight) {
                    newWidth = component.getWidth();
                    newHeight = component.getHeight();
                    for (SectionComponent sectionComponent : components) {
                        sectionComponent.setTextAreaWidth(newWidth - 25);
                        int paneHeight = (newHeight / components.size()) - 34;
                        sectionComponent.setTextScrollPaneHeight(paneHeight);
                    }
                }
            };
        }

        public void setComponents(List<SectionComponent> components) {
            this.components = components;
        }

        public ComponentListener getListener() {
            return listener;
        }
    }

    public class SectionComponent {
        protected int textAreaWidth;
        protected int textScrollPaneHeight;

        protected Expander expander;
        protected ScrollPane textScrollPane;
        protected SectionText sectionText;
        protected TextArea textArea;

        public SectionComponent(SectionText sectionText, 
                int textAreaWidth, int textScrollPaneHeight) 
                        throws IOException {
            this.sectionText = sectionText;
            this.textAreaWidth = textAreaWidth;
            this.textScrollPaneHeight = textScrollPaneHeight;
            createPartControl();
        }

        protected void createPartControl() throws IOException {
            textArea = new TextArea();
            textArea.setEditable(false);
            textArea.setPreferredWidth(textAreaWidth);
            textArea.setText(sectionText.getTopic());

            textScrollPane = new ScrollPane();
            textScrollPane.setPreferredHeight(textScrollPaneHeight);
            textScrollPane.setVerticalScrollBarPolicy(
                    ScrollPane.ScrollBarPolicy.AUTO);
            textScrollPane.setView(textArea);

            expander = new Expander();
            expander.setTitle(sectionText.getTitle());
            expander.setContent(textScrollPane);
            expander.setExpanded(false);
        }

        public Expander getExpander() {
            return expander;
        }

        public void setTextAreaWidth(int textAreaWidth) {
            this.textAreaWidth = textAreaWidth;
            textArea.setPreferredWidth(textAreaWidth);
        }

        public void setTextScrollPaneHeight(int textScrollPaneHeight) {
            this.textScrollPaneHeight = textScrollPaneHeight;
            textScrollPane.setPreferredHeight(textScrollPaneHeight);
        }

    }

    public class SectionText {
        protected String title;
        protected Reader topic;

        public SectionText(String title, Reader topic) {
            this.title = title;
            this.topic = topic;
        }

        public String getTitle() {
            return title;
        }

        public Reader getTopic() {
            return topic;
        }
    }

    public class SectionCollection {
        protected List<SectionText> collection;

        public SectionCollection() {
            this.collection = new ArrayList<SectionText>();
        }

        public void add(SectionText sectionText) {
            collection.add(sectionText);
        }

        public int size() {
            return collection.size();
        }

        public SectionText get(int index) {
            return collection.get(index);
        }
    }   

    public class SectionCollectionCreator {
        protected SectionCollection collection;

        protected static final String text = "Attributes, Styles and Style Contexts\n\n"
                + "The simple PlainDocument class that you saw in the previous "
                + "chapter is only capable of holding text. The more complex text "
                + "components use a more sophisticated model that implements the "
                + "StyledDocument interface. StyledDocument is a sub-interface of "
                + "Document that contains methods for manipulating attributes that "
                + "control the way in which the text in the document is displayed. "
                + "The Swing text package contains a concrete implementation of "
                + "StyledDocument called DefaultStyledDocument that is used as the "
                + "default model for JTextPane and is also the base class from which "
                + "more specific models, such as the HTMLDocument class that handles "
                + "input in HTML format, can be created. In order to make use of "
                + "DefaultStyledDocument and JTextPane, you need to understand how "
                + "Swing represents and uses attributes.";

        public SectionCollectionCreator(SectionCollection collection) {
            this.collection = collection;

            String title = "Title ";

            for (int i = 1; i <= 3; i++) {
                SectionText sectionText = new SectionText(title + i, 
                        new StringReader(text));
                collection.add(sectionText);
            }
        }   
    }

}

Answer 2

您可能还需要考虑将组件放在FillPane中，这样可以调整它们的大小以填充可用区域。这似乎是Pivot做事的方式。

将Apache Pivot GUI组件的大小调整到窗口

2 个答案: