ru.scratch.ScratchListenClipboardAction.java Source code

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Here is the source code for ru.scratch.ScratchListenClipboardAction.java

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/*
 * 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 ru.scratch;

import com.intellij.openapi.actionSystem.AnActionEvent;
import com.intellij.openapi.actionSystem.Presentation;
import com.intellij.openapi.actionSystem.ToggleAction;
import com.intellij.openapi.application.ApplicationManager;
import com.intellij.openapi.diagnostic.Logger;
import com.intellij.openapi.editor.Document;
import com.intellij.openapi.editor.Editor;
import com.intellij.openapi.fileEditor.FileDocumentManager;
import com.intellij.openapi.fileEditor.FileEditorManager;
import com.intellij.openapi.ide.CopyPasteManager;
import com.intellij.openapi.project.DumbAware;
import com.intellij.openapi.util.IconLoader;
import com.intellij.openapi.vfs.VirtualFile;
import com.intellij.openapi.wm.IdeFocusManager;
import com.intellij.openapi.wm.IdeFrame;
import org.apache.commons.lang.StringUtils;
import org.jetbrains.annotations.Nullable;

import javax.swing.*;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.io.IOException;

public class ScratchListenClipboardAction extends ToggleAction
        implements DumbAware, CopyPasteManager.ContentChangedListener {
    private static final Logger LOG = Logger.getInstance(ScratchListenClipboardAction.class.getName());

    private static final Icon IS_ON_ICON = IconLoader.getIcon("/actions/menu-paste.png");
    private static final Icon IS_OFF_ICON = IconLoader
            .getDisabledIcon(IconLoader.getIcon("/actions/menu-paste.png"));

    public ScratchListenClipboardAction() {
        CopyPasteManager.getInstance().addContentChangedListener(this);
    }

    @Override
    public void setSelected(AnActionEvent event, boolean enabled) {
        ScratchData.getInstance().setAppendContentFromClipboard(enabled);
        updateIcon(event.getPresentation(), enabled);
    }

    @Override
    public boolean isSelected(AnActionEvent event) {
        return ScratchData.getInstance().isAppendContentFromClipboard();
    }

    @Override
    public void contentChanged(@Nullable Transferable oldTransferable, Transferable newTransferable) {
        if (!ScratchData.getInstance().isAppendContentFromClipboard())
            return;

        try {
            String oldClipboard = null;
            if (oldTransferable != null && oldTransferable.getTransferData(DataFlavor.stringFlavor) != null) {
                oldClipboard = oldTransferable.getTransferData(DataFlavor.stringFlavor).toString();
            }
            String clipboard = null;
            if (newTransferable != null && newTransferable.getTransferData(DataFlavor.stringFlavor) != null) {
                clipboard = newTransferable.getTransferData(DataFlavor.stringFlavor).toString();
            }
            if (clipboard != null && !StringUtils.equals(oldClipboard, clipboard)) {
                writeToScratch(clipboard);
            }
        } catch (UnsupportedFlavorException e) {
            LOG.info(e);
        } catch (IOException e) {
            LOG.info(e);
        }
    }

    private static void writeToScratch(final String clipboard) {
        ApplicationManager.getApplication().runWriteAction(new Runnable() {
            @Override
            public void run() {
                Document document = getScratchDocument();
                if (document == null) {
                    return;
                }
                if (hasFocusInEditor(document))
                    return;

                String text = document.getText();
                if (text.endsWith("\n")) {
                    document.setText(text + clipboard);
                } else {
                    document.setText(text + "\n" + clipboard);
                }

                FileDocumentManager.getInstance().saveDocument(document);
            }
        });
    }

    private static boolean hasFocusInEditor(Document document) {
        Editor selectedTextEditor = getSelectedEditor();
        if (selectedTextEditor != null) {
            if (selectedTextEditor.getDocument().equals(document)) {
                return true;
            }
        }
        return false;
    }

    @Nullable
    private static Document getScratchDocument() {
        VirtualFile file = ScratchComponent.getDefaultScratch();
        if (file == null) {
            return null;
        }
        FileDocumentManager fileDocumentManager = FileDocumentManager.getInstance();
        return fileDocumentManager.getDocument(file);
    }

    private static Editor getSelectedEditor() {
        IdeFrame frame = IdeFocusManager.findInstance().getLastFocusedFrame();
        if (frame == null)
            return null;

        FileEditorManager instance = FileEditorManager.getInstance(frame.getProject());
        return instance.getSelectedTextEditor();
    }

    @Override
    public void update(AnActionEvent e) {
        super.update(e);
        updateIcon(e.getPresentation(), isSelected(e));
    }

    private void updateIcon(Presentation presentation, boolean enabled) {
        presentation.setIcon(enabled ? IS_ON_ICON : IS_OFF_ICON);
    }

}