Show how to handle files on command line in docview sample.

This is not totally obvious, so show how to do it, including the Mac-specific
MacNewFile() overriding part.

Closes #16816.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@78498 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/docview/docview.cpp

@@ -108,6 +108,10 @@ void MyApp::OnInitCmdLine(wxCmdLineParser& parser)
                      "run in SDI mode: multiple documents, multiple windows");
     parser.AddSwitch("", CmdLineOption::SINGLE,
                      "run in single document mode");
+
+    parser.AddParam("document-file",
+                    wxCMD_LINE_VAL_STRING,
+                    wxCMD_LINE_PARAM_MULTIPLE | wxCMD_LINE_PARAM_OPTIONAL);
 }
 
 bool MyApp::OnCmdLineParsed(wxCmdLineParser& parser)
@@ -140,9 +144,19 @@ bool MyApp::OnCmdLineParsed(wxCmdLineParser& parser)
         return false;
     }
 
+    // save any files given on the command line: we'll open them in OnInit()
+    // later, after creating the frame
+    for ( size_t i = 0; i != parser.GetParamCount(); ++i )
+        m_filesFromCmdLine.push_back(parser.GetParam(i));
+
     return wxApp::OnCmdLineParsed(parser);
 }
 
+void MyApp::MacNewFile()
+{
+    wxDocManager::GetDocumentManager()->CreateNewDocument();
+}
+
 bool MyApp::OnInit()
 {
     if ( !wxApp::OnInit() )
@@ -229,7 +243,6 @@ bool MyApp::OnInit()
     {
         m_canvas = new MyCanvas(NULL, frame);
         m_menuEdit = CreateDrawingEditMenu();
-        docManager->CreateNewDocument();
     }
 
     CreateMenuBarForFrame(frame, menuFile, m_menuEdit);
@@ -238,6 +251,16 @@ bool MyApp::OnInit()
     frame->Centre();
     frame->Show();
 
+    if ( m_filesFromCmdLine.empty() )
+    {
+        docManager->CreateNewDocument();
+    }
+    else // we have files to open on command line
+    {
+        for ( size_t i = 0; i != m_filesFromCmdLine.size(); ++i )
+            docManager->CreateDocument(m_filesFromCmdLine[i], wxDOC_SILENT);
+    }
+
     return true;
 }