Documentation: Fix "Using Model Indexes" in Model View Programming guide to work

The code introduced by 54d5ca0c2766e915c960fa437cee6c20a324c1a7
did not work since the variables parentIndex/numRows
were local to the lambda and the outer code would not wait.
Move the widgets population into the lambda to fix this.

Modernize the remaining code a bit.

Pick-to: 6.4 6.3 6.2
Change-Id: I2a09878987df9edb9ff04f0ac4ad82af1a8b52c8
Reviewed-by: Paul Wicking <paul.wicking@qt.io>

1 files changed, 9 insertions, 4 deletions

diff --git a/src/widgets/doc/src/model-view-programming.qdoc b/src/widgets/doc/src/model-view-programming.qdoc
index e0febae255..5c09fd0445 100644
--- a/src/widgets/doc/src/model-view-programming.qdoc
+++ b/src/widgets/doc/src/model-view-programming.qdoc
@@ -449,11 +449,13 @@
     \snippet simplemodel-use/main.cpp 0
 
     In this case, we start by setting up a default QFileSystemModel. We connect
-    it to a lambda, in which we will obtain a parent index using a specific
+    its signal \c directoryLoaded(QString) to a lambda, in which we will
+    obtain a parent index for the directory using a specific
     implementation of \l{QFileSystemModel::}{index()} provided by that model.
-    In the lambda, we count the number of rows in the model using the
-     \l{QFileSystemModel::}{rowCount()} function. Finally, we set the root path
-    of the QFileSystemModel so it starts loading data and triggers the lambda.
+
+    In the lambda, we determine the number of rows in the model using the
+     \l{QFileSystemModel::}{rowCount()} function.
+
 
     For simplicity, we are only interested in the items in the first column
     of the model. We examine each row in turn, obtaining a model index for
@@ -474,6 +476,9 @@
     \codeline
     \snippet simplemodel-use/main.cpp 3
 
+    Finally, we set the root path of the QFileSystemModel so it starts
+    loading data and triggers the lambda.
+
     The above example demonstrates the basic principles used to retrieve
     data from a model: