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Diffstat (limited to 'bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/wpf/org/eclipse/swt/dnd/TextTransfer.java')
-rw-r--r-- | bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/wpf/org/eclipse/swt/dnd/TextTransfer.java | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/wpf/org/eclipse/swt/dnd/TextTransfer.java b/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/wpf/org/eclipse/swt/dnd/TextTransfer.java new file mode 100644 index 0000000000..3dfc44cbaa --- /dev/null +++ b/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/wpf/org/eclipse/swt/dnd/TextTransfer.java @@ -0,0 +1,93 @@ +/******************************************************************************* + * Copyright (c) 2000, 2008 IBM Corporation and others. + * All rights reserved. This program and the accompanying materials + * are made available under the terms of the Eclipse Public License v1.0 + * which accompanies this distribution, and is available at + * http://www.eclipse.org/legal/epl-v10.html + * + * Contributors: + * IBM Corporation - initial API and implementation + *******************************************************************************/ +package org.eclipse.swt.dnd; + +import org.eclipse.swt.internal.wpf.*; + + +/** + * The class <code>TextTransfer</code> provides a platform specific mechanism + * for converting plain text represented as a java <code>String</code> + * to a platform specific representation of the data and vice versa. + * + * <p>An example of a java <code>String</code> containing plain text is shown + * below:</p> + * + * <code><pre> + * String textData = "Hello World"; + * </code></pre> + * + * @see Transfer + */ +public class TextTransfer extends ByteArrayTransfer { + +private static TextTransfer _instance = new TextTransfer(); +private static int TYPEID = getTypeId(); + +/** + * Returns the singleton instance of the TextTransfer class. + * + * @return the singleton instance of the TextTransfer class + */ +public static TextTransfer getInstance () { + return _instance; +} + +static int getTypeId() { + int format = OS.DataFormats_UnicodeText(); + String name = createJavaString(format); + OS.GCHandle_Free(format); + return registerType(name); +} + +private TextTransfer() { +} + +boolean checkText(Object object) { + return object != null && object instanceof String && ((String)object).length() > 0; +} + +protected int[] getTypeIds(){ + return new int[]{TYPEID}; +} + +/** + * This implementation of <code>javaToNative</code> converts plain text + * represented by a java <code>String</code> to a platform specific representation. + * + * @param object a java <code>String</code> containing text + * @param transferData an empty <code>TransferData</code> object that will + * be filled in on return with the platform specific format of the data + * + * @see Transfer#nativeToJava + */ +public void javaToNative (Object object, TransferData transferData) { + if (!checkText(object) || !isSupportedType(transferData)) { + DND.error(DND.ERROR_INVALID_DATA); + } + transferData.pValue = createDotNetString((String)object); +} + +/** + * This implementation of <code>nativeToJava</code> converts a platform specific + * representation of plain text to a java <code>String</code>. + * + * @param transferData the platform specific representation of the data to be converted + * @return a java <code>String</code> containing text if the conversion was successful; otherwise null + * + * @see Transfer#javaToNative + */ +public Object nativeToJava(TransferData transferData) { + if (!isSupportedType(transferData) || transferData.pValue == 0) return null; + + return createJavaString(transferData.pValue); +} +} |