Doc: Update first plugin example.

Change-Id: I90405eaba68efa0f6861a54a7283dc062a3d1408
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@digia.com>

doc/api/examples/exampleplugin/Example.pluginspec.in

@@ -9,9 +9,7 @@
     <url>http://www.mycompany.com</url>
 //! [2]
 //! [3]
-    <dependencyList>
-        <dependency name=\"Core\" version=\"$$QTCREATOR_VERSION\"/>
-    </dependencyList>
+    $$dependencyList
 //! [3]
 </plugin>
 

doc/api/examples/exampleplugin/example.pro

@@ -1,7 +1,4 @@
 #! [1]
-TARGET = Example
-TEMPLATE = lib
-
 DEFINES += EXAMPLE_LIBRARY
 #! [1]
 
@@ -10,8 +7,8 @@ DEFINES += EXAMPLE_LIBRARY
 #! [2]
 SOURCES += exampleplugin.cpp
 
-HEADERS += exampleplugin.h\
-        example_global.h\
+HEADERS += exampleplugin.h \
+        example_global.h \
         exampleconstants.h
 #! [2]
 
@@ -41,10 +38,26 @@ isEmpty(IDE_BUILD_TREE):IDE_BUILD_TREE=/Users/example/qtcreator-build
 PROVIDER = MyCompany
 #![5]
 
-#![6]
+#! [6]
+###### If the plugin can be depended upon by other plugins, this code needs to be outsourced to
+###### <dirname>_dependencies.pri, where <dirname> is the name of the directory containing the
+###### plugin's sources.
+
+QTC_PLUGIN_NAME = Example
+QTC_LIB_DEPENDS += \
+    # nothing here at this time
+
+QTC_PLUGIN_DEPENDS += \
+    coreplugin
+
+QTC_PLUGIN_RECOMMENDS += \
+    # optional plugin dependencies. nothing here at this time
+
+###### End _dependencies.pri contents ######
+#! [6]
+
+#![7]
 include($$QTCREATOR_SOURCES/src/qtcreatorplugin.pri)
-include($$QTCREATOR_SOURCES/src/plugins/coreplugin/coreplugin.pri)
 
-LIBS += -L$$IDE_PLUGIN_PATH/QtProject
-#![6]
+#![7]
 

doc/api/examples/exampleplugin/exampleplugin.cpp

@@ -75,7 +75,7 @@ ExtensionSystem::IPlugin::ShutdownFlag ExamplePlugin::aboutToShutdown()
 //! [slot implementation]
 void ExamplePlugin::triggerAction()
 {
-    QMessageBox::information(Core::ICore::instance()->mainWindow(),
+    QMessageBox::information(Core::ICore::mainWindow(),
                              tr("Action triggered"),
                              tr("This is an action from Example."));
 }

doc/api/examples/exampleplugin/exampleplugin.h

@@ -14,6 +14,7 @@ namespace Internal {
 class ExamplePlugin : public ExtensionSystem::IPlugin
 {
     Q_OBJECT
+    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QtCreatorPlugin" FILE "Example.json")
 //! [base class]
 
 public: