Changeset 470 for trunk/src/gui/kernel/qdnd_pm.cpp

Timestamp:

Jan 23, 2010, 3:44:11 PM (16 years ago)

Author:

Dmitry A. Kuminov

Message:

gui: DnD: Added support for dragging empty QMimeData with no formats (used in particular by QDesigner for in-process drag and drop).

File:

• trunk/src/gui/kernel/qdnd_pm.cpp (modified) (1 diff)

trunk/src/gui/kernel/qdnd_pm.cpp

@@ -913 +913 @@
     }
 
+    if (!mimeData->formats().count()) {
+        // The drag source doesn't provide any format, so we've got no workers.
+        // Although it may look strange, but it is a supported case: for
+        // example, designer uses it a lot for in-process DnD. Instead of MIME
+        // data, it works directly with the QMimeData object from the drag
+        // source. We will go through the converters passing a special value of
+        // QString::null as MIME type -- one of them (e.g. QPMAnyMime) should
+        // take it over and return itself.
+        Q_ASSERT(!workers.count());
+        DEBUG(() << "QPMCoopDragWorker: Source provides NO data, looking for a "
+                    "converter that can handle this");
+        foreach (QPMMime *mime, QPMMime::all()) {
+            DragWorker *wrk = mime->dragWorkerFor(QString::null, mimeData);
+            if (wrk) {
+                workers.append(wrk);
+                break;
+            }
+        }
+    }
+
 #if defined(QDND_DEBUG)
     foreach (DragWorker *wrk, workers) {