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Hi, all

In KDE 3 , it was possible to set a wallpaper by dragging a picture from
konqueror. And I implement this feature in Plasma::Containment.

Note:
When you use this function, the plugin of wallpaper will be set as image,
and the mode will be set as SingleImage.
I think this is what most people want to do.

Regards

-- 
ÅËÎÀƽ(Peter Pan)
Red Flag Software Co., Ltd

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Index: containment.h
===================================================================
--- containment.h	(revision 1007852)
+++ containment.h	(working copy)
@@ -540,6 +540,12 @@
          */
         const QGraphicsItem *toolBoxItem() const;
 
+        /**
+         * set the url as wallpaper
+         * set the wallpaper plugin as image, and set the mode as SingleImage
+         */
+        void setAsWallpaper(const KUrl &url);
+
     private:
         Q_PRIVATE_SLOT(d, void appletDestroyed(Plasma::Applet*))
         Q_PRIVATE_SLOT(d, void containmentAppletAnimationComplete(QGraphicsItem *item,
Index: containment.cpp
===================================================================
--- containment.cpp	(revision 1007852)
+++ containment.cpp	(working copy)
@@ -24,6 +24,7 @@
 #include <QApplication>
 #include <QClipboard>
 #include <QFile>
+#include <QFileInfo>
 #include <QGraphicsSceneContextMenuEvent>
 #include <QGraphicsView>
 #include <QMimeData>
@@ -1117,7 +1118,22 @@
         //TODO: collect the mimetypes of available script engines and offer
         //      to create widgets out of the matching URLs, if any
         const KUrl::List urls = KUrl::List::fromMimeData(mimeData);
+        
         foreach (const KUrl &url, urls) {
+            QMenu choices;
+            QHash<QAction *, QString> actionsToPlugins;
+
+            if (urls.count() == 1) {
+                    QFileInfo fileInfo(urls[0].pathOrUrl());
+                    QString suffix = fileInfo.suffix();
+                    if (suffix == "png" || suffix == "jpg" || suffix == "jpeg" || suffix == "xcf"
+                                    || suffix == "svg" || suffix == "svgz")
+                    {
+                        QIcon icon = KIcon("configure");
+                        actionsToPlugins.insert(choices.addAction(icon, i18n("Set as Wallpaper")), "setAsWallpaper");   
+                    }
+            }
+
             KMimeType::Ptr mime = KMimeType::findByUrl(url);
             QString mimeName = mime->name();
             QRectF geom(pos, QSize());
@@ -1129,8 +1145,6 @@
             if (!appletList.isEmpty()) {
                 //TODO: should we show a dialog here to choose which plasmoid load if
                 //!appletList.isEmpty()
-                QMenu choices;
-                QHash<QAction *, QString> actionsToPlugins;
                 foreach (const KPluginInfo &info, appletList) {
                     QAction *action;
                     if (!info.icon().isEmpty()) {
@@ -1143,15 +1157,20 @@
                 }
 
                 actionsToPlugins.insert(choices.addAction(i18n("Icon")), "icon");
-                QAction *choice = choices.exec(screenPos);
-                if (choice) {
-                    q->addApplet(actionsToPlugins[choice], args, geom);
-                }
             } else if (url.protocol() != "data") {
                 // We don't try to do anything with data: URIs
                 // no special applet associated with this mimetype, let's
-                q->addApplet("icon", args, geom);
+                actionsToPlugins.insert(choices.addAction(i18n("Icon")), "icon");
             }
+            
+            QAction *choice = choices.exec(screenPos);
+            if (choice) {
+                if (actionsToPlugins[choice] == "setAsWallpaper") {
+                    q->setAsWallpaper(url);        
+                    return;        
+                }
+                q->addApplet(actionsToPlugins[choice], args, geom);
+            }
         }
 
         if (dropEvent) {
@@ -2043,6 +2062,38 @@
     }
 }
 
+void Containment::setAsWallpaper(const KUrl &url)
+{
+    QString pluginName = "image";
+    QString mode = "SingleImage";
+
+    KConfigGroup cfg = config();
+
+    if (d->drawWallpaper) {
+        if (d->wallpaper) {
+            if (d->wallpaper->pluginName() != pluginName) {
+                delete d->wallpaper;
+                d->wallpaper = 0;
+            }
+        }
+
+        if (!d->wallpaper) {
+            d->wallpaper = Plasma::Wallpaper::load(pluginName);
+        }
+
+        if (d->wallpaper) {
+            cfg.writeEntry("wallpaperplugin", pluginName);
+            cfg.writeEntry("wallpaperpluginmode", mode);
+            KConfigGroup wallpaperConfig = KConfigGroup(&cfg, "Wallpaper");
+            wallpaperConfig = KConfigGroup(&wallpaperConfig, pluginName);
+            wallpaperConfig.writeEntry("wallpaper", url.pathOrUrl());
+        }
+    }
+
+    emit configNeedsSaving();
+    setWallpaper(pluginName, mode);
+}
+
 } // Plasma namespace
 
 #include "containment.moc"

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