Mercurial > projects > dwt2
view org.eclipse.swt.win32.win32.x86/src/org/eclipse/swt/dnd/TextTransfer.d @ 125:c43718956f21 default tip
Updated the snippets status.
author | Jacob Carlborg <doob@me.com> |
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date | Thu, 11 Aug 2011 19:55:14 +0200 |
parents | b98647bc0aef |
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/******************************************************************************* * 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 * Port to the D programming language: * Frank Benoit <benoit@tionex.de> *******************************************************************************/ module org.eclipse.swt.dnd.TextTransfer; import org.eclipse.swt.internal.ole.win32.COM; import org.eclipse.swt.internal.ole.win32.OBJIDL; import org.eclipse.swt.internal.win32.OS; import org.eclipse.swt.dnd.ByteArrayTransfer; import org.eclipse.swt.dnd.TransferData; import org.eclipse.swt.dnd.DND; import java.lang.all; /** * 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 : ByteArrayTransfer { private static TextTransfer _instance; private static const String CF_UNICODETEXT = "CF_UNICODETEXT"; //$NON-NLS-1$ private static const String CF_TEXT = "CF_TEXT"; //$NON-NLS-1$ private static const int CF_UNICODETEXTID = COM.CF_UNICODETEXT; private static const int CF_TEXTID = COM.CF_TEXT; private this() {} /** * Returns the singleton instance of the TextTransfer class. * * @return the singleton instance of the TextTransfer class */ public static TextTransfer getInstance () { if( _instance is null ){ synchronized { if( _instance is null ){ _instance = new TextTransfer(); } } } return _instance; } /** * 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.result = COM.E_FAIL; String string = stringcast(object); switch (transferData.type) { case COM.CF_UNICODETEXT: { String16 chars = StrToWCHARs(0,string, true); int charCount = chars.length; int byteCount = chars.length * 2; auto newPtr = OS.GlobalAlloc(COM.GMEM_FIXED | COM.GMEM_ZEROINIT, byteCount); OS.MoveMemory(newPtr, chars.ptr, byteCount); transferData.stgmedium = new STGMEDIUM(); transferData.stgmedium.tymed = COM.TYMED_HGLOBAL; transferData.stgmedium.unionField = newPtr; transferData.stgmedium.pUnkForRelease = null; transferData.result = COM.S_OK; break; } case COM.CF_TEXT: { String16 chars = StrToWCHARs(0,string, true); int count = chars.length; int codePage = OS.GetACP(); int cchMultiByte = OS.WideCharToMultiByte(codePage, 0, chars.ptr, -1, null, 0, null, null); if (cchMultiByte is 0) { transferData.stgmedium = new STGMEDIUM(); transferData.result = COM.DV_E_STGMEDIUM; return; } auto lpMultiByteStr = cast(CHAR*)OS.GlobalAlloc(COM.GMEM_FIXED | COM.GMEM_ZEROINIT, cchMultiByte); OS.WideCharToMultiByte(codePage, 0, chars.ptr, -1, lpMultiByteStr, cchMultiByte, null, null); transferData.stgmedium = new STGMEDIUM(); transferData.stgmedium.tymed = COM.TYMED_HGLOBAL; transferData.stgmedium.unionField = lpMultiByteStr; transferData.stgmedium.pUnkForRelease = null; transferData.result = COM.S_OK; break; } default: } return; } /** * 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.pIDataObject is null) return null; IDataObject data = transferData.pIDataObject; data.AddRef(); FORMATETC* formatetc = transferData.formatetc; STGMEDIUM* stgmedium = new STGMEDIUM(); stgmedium.tymed = COM.TYMED_HGLOBAL; transferData.result = getData(data, formatetc, stgmedium); data.Release(); if (transferData.result !is COM.S_OK) return null; auto hMem = stgmedium.unionField; try { switch (transferData.type) { case CF_UNICODETEXTID: { /* Ensure byteCount is a multiple of 2 bytes */ int size = OS.GlobalSize(hMem) / 2 * 2; if (size is 0) return null; wchar[] chars = new wchar[size/2]; auto ptr = OS.GlobalLock(hMem); if (ptr is null) return null; try { OS.MoveMemory(chars.ptr, ptr, size); int length_ = chars.length; for (int i=0; i<chars.length; i++) { if (chars [i] is '\0') { length_ = i; break; } } return new ArrayWrapperString (WCHARsToStr(chars[ 0 .. length_])); } finally { OS.GlobalUnlock(hMem); } } case CF_TEXTID: { auto lpMultiByteStr = cast(CHAR*)OS.GlobalLock(hMem); if (lpMultiByteStr is null) return null; try { int codePage = OS.GetACP(); int cchWideChar = OS.MultiByteToWideChar (codePage, OS.MB_PRECOMPOSED, lpMultiByteStr, -1, null, 0); if (cchWideChar is 0) return null; wchar[] lpWideCharStr = new wchar [cchWideChar - 1]; OS.MultiByteToWideChar (codePage, OS.MB_PRECOMPOSED, lpMultiByteStr, -1, lpWideCharStr.ptr, lpWideCharStr.length); return new ArrayWrapperString( WCHARzToStr(lpWideCharStr.ptr)); } finally { OS.GlobalUnlock(hMem); } } default: } } finally { OS.GlobalFree(hMem); } return null; } protected int[] getTypeIds(){ return [CF_UNICODETEXTID, CF_TEXTID]; } protected String[] getTypeNames(){ return [CF_UNICODETEXT, CF_TEXT]; } bool checkText(Object object) { if( auto s = cast(ArrayWrapperString)object ){ return s.array.length > 0; } return false; } protected bool validate(Object object) { return checkText(object); } }