Bug 200743 - [Clipboard] Copy/Paste intermittently doesn't work for a line of text - back port for 3.4.1

8 files changed, 32 insertions, 8 deletions

diff --git a/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/ByteArrayTransfer.java b/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/ByteArrayTransfer.java
index 14c330839d..d33f8815ae 100755
--- a/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/ByteArrayTransfer.java
+++ b/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/ByteArrayTransfer.java
@@ -193,7 +193,7 @@ protected Object nativeToJava(TransferData transferData) {
 	FORMATETC formatetc = transferData.formatetc;
 	STGMEDIUM stgmedium = new STGMEDIUM();
 	stgmedium.tymed = COM.TYMED_HGLOBAL;	
-	transferData.result = data.GetData(formatetc, stgmedium);
+	transferData.result = getData(data, formatetc, stgmedium);
 	data.Release();
 	if (transferData.result != COM.S_OK) return null;
 	int /*long*/ hMem = stgmedium.unionField;
diff --git a/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/FileTransfer.java b/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/FileTransfer.java
index 57176f7691..8acb6456d1 100755
--- a/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/FileTransfer.java
+++ b/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/FileTransfer.java
@@ -117,7 +117,7 @@ public Object nativeToJava(TransferData transferData) {
 	formatetc.tymed = COM.TYMED_HGLOBAL;
 	STGMEDIUM stgmedium = new STGMEDIUM();
 	stgmedium.tymed = COM.TYMED_HGLOBAL;
-	transferData.result = dataObject.GetData(formatetc, stgmedium);
+	transferData.result = getData(dataObject, formatetc, stgmedium);
 	dataObject.Release();
 	if (transferData.result != COM.S_OK) return null;
 	// How many files are there?
diff --git a/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/HTMLTransfer.java b/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/HTMLTransfer.java
index 45319d6337..9664d49d67 100644
--- a/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/HTMLTransfer.java
+++ b/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/HTMLTransfer.java
@@ -134,7 +134,7 @@ public Object nativeToJava(TransferData transferData){
 	STGMEDIUM stgmedium = new STGMEDIUM();
 	FORMATETC formatetc = transferData.formatetc;
 	stgmedium.tymed = COM.TYMED_HGLOBAL;	
-	transferData.result = data.GetData(formatetc, stgmedium);
+	transferData.result = getData(data, formatetc, stgmedium);
 	data.Release();	
 	if (transferData.result != COM.S_OK) return null;
 	int /*long*/ hMem = stgmedium.unionField;
diff --git a/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/ImageTransfer.java b/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/ImageTransfer.java
index 45295ff8ad..96bb239570 100644
--- a/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/ImageTransfer.java
+++ b/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/ImageTransfer.java
@@ -143,7 +143,7 @@ public Object nativeToJava(TransferData transferData) {
 	formatetc.tymed = COM.TYMED_HGLOBAL;
 	STGMEDIUM stgmedium = new STGMEDIUM();
 	stgmedium.tymed = COM.TYMED_HGLOBAL;
-	transferData.result = dataObject.GetData(formatetc, stgmedium);
+	transferData.result = getData(dataObject, formatetc, stgmedium);
 
 	if (transferData.result != COM.S_OK) return null;
 	int /*long*/ hMem = stgmedium.unionField;
diff --git a/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/RTFTransfer.java b/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/RTFTransfer.java
index 1b09d64cf3..f8da4986c4 100755
--- a/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/RTFTransfer.java
+++ b/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/RTFTransfer.java
@@ -97,7 +97,7 @@ public Object nativeToJava(TransferData transferData){
 	STGMEDIUM stgmedium = new STGMEDIUM();
 	FORMATETC formatetc = transferData.formatetc;
 	stgmedium.tymed = COM.TYMED_HGLOBAL;	
-	transferData.result = data.GetData(formatetc, stgmedium);
+	transferData.result = getData(data, formatetc, stgmedium);
 	data.Release();	
 	if (transferData.result != COM.S_OK) return null;
 	int /*long*/ hMem = stgmedium.unionField;
diff --git a/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/TextTransfer.java b/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/TextTransfer.java
index 6d00e849ff..94b3cf0fed 100755
--- a/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/TextTransfer.java
+++ b/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/TextTransfer.java
@@ -118,7 +118,7 @@ public Object nativeToJava(TransferData transferData){
 	FORMATETC formatetc = transferData.formatetc;
 	STGMEDIUM stgmedium = new STGMEDIUM();
 	stgmedium.tymed = COM.TYMED_HGLOBAL;	
-	transferData.result = data.GetData(formatetc, stgmedium);
+	transferData.result = getData(data, formatetc, stgmedium);
 	data.Release();
 	if (transferData.result != COM.S_OK) return null;
 	int /*long*/ hMem = stgmedium.unionField;
diff --git a/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/Transfer.java b/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/Transfer.java
index e05f6de3b9..4a7f318b21 100755
--- a/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/Transfer.java
+++ b/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/Transfer.java
@@ -11,6 +11,7 @@
 package org.eclipse.swt.dnd;
 
  
+import org.eclipse.swt.internal.ole.win32.*;
 import org.eclipse.swt.internal.win32.*;
 
 /**
@@ -29,7 +30,30 @@ import org.eclipse.swt.internal.win32.*;
  * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
  */
 public abstract class Transfer {
-	
+
+private static final int RETRY_LIMIT = 10;
+/* 
+ * Feature in Windows. When another application has control
+ * of the clipboard, the clipboard is locked and it's not
+ * possible to retrieve data until the other application is
+ * finished. To allow other applications to get the
+ * data, use PeekMessage() to enable cross thread
+ * message sends.
+ */
+int getData(IDataObject dataObject, FORMATETC pFormatetc, STGMEDIUM pmedium) {
+	if (dataObject.GetData(pFormatetc, pmedium) == COM.S_OK) return COM.S_OK;
+	try {Thread.sleep(50);} catch (Throwable t) {}
+	int result = dataObject.GetData(pFormatetc, pmedium);
+	int retryCount = 0;
+	while (result != COM.S_OK && retryCount++ < RETRY_LIMIT) {
+		MSG msg = new MSG();
+		OS.PeekMessage(msg, 0, 0, 0, OS.PM_NOREMOVE | OS.PM_NOYIELD);
+		try {Thread.sleep(50);} catch (Throwable t) {}
+		result = dataObject.GetData(pFormatetc, pmedium);
+	}
+	return result;
+}
+
 /**
  * Returns a list of the platform specific data types that can be converted using 
  * this transfer agent.
diff --git a/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/URLTransfer.java b/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/URLTransfer.java
index d023efc328..71935b45ad 100644
--- a/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/URLTransfer.java
+++ b/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/URLTransfer.java
@@ -98,7 +98,7 @@ public Object nativeToJava(TransferData transferData){
 	STGMEDIUM stgmedium = new STGMEDIUM();
 	FORMATETC formatetc = transferData.formatetc;
 	stgmedium.tymed = COM.TYMED_HGLOBAL;	
-	transferData.result = data.GetData(formatetc, stgmedium);
+	transferData.result = getData(data, formatetc, stgmedium);
 	data.Release();	
 	if (transferData.result != COM.S_OK) return null;
 	int /*long*/ hMem = stgmedium.unionField;