Show using dynamic splash screen contents in the sample

Demonstrate how dynamic information can be shown in the splash screen
overlaying the static bitmap.

Closes https://github.com/wxWidgets/wxWidgets/pull/958

samples/splash/splash.cpp

@@ -62,6 +62,8 @@ public:
     // initialization (doing it here and not in the ctor allows to have an error
     // return: if OnInit() returns false, the application terminates)
     virtual bool OnInit() wxOVERRIDE;
+
+    void DecorateSplashScreen(wxBitmap& bmp);
 };
 
 // Define a new frame type: this is going to be our main frame
@@ -141,6 +143,10 @@ bool MyApp::OnInit()
 
     if (ok)
     {
+        // we can even draw dynamic artwork onto our splashscreen
+        DecorateSplashScreen(bitmap);
+
+        // show the splashscreen
         new wxSplashScreen(bitmap,
             wxSPLASH_CENTRE_ON_SCREEN|wxSPLASH_TIMEOUT,
             6000, frame, wxID_ANY, wxDefaultPosition, wxDefaultSize,
@@ -162,6 +168,41 @@ bool MyApp::OnInit()
     return true;
 }
 
+// Draws artwork onto our splashscreen at runtime
+void MyApp::DecorateSplashScreen(wxBitmap& bmp)
+{
+    // use a memory DC to draw directly onto the bitmap
+    wxMemoryDC memDc(bmp);
+
+    // draw an orange box (with black outline) at the bottom of the splashscreen.
+    // this box will be 10% of the height of the bitmap, and be at the bottom.
+    const wxRect bannerRect(wxPoint(0, (bmp.GetHeight() / 10)*9),
+                            wxPoint(bmp.GetWidth(), bmp.GetHeight()));
+    wxDCBrushChanger bc(memDc, wxBrush(wxColour(255, 102, 0)));
+    memDc.DrawRectangle(bannerRect);
+    memDc.DrawLine(bannerRect.GetTopLeft(), bannerRect.GetTopRight());
+
+    // dynamically get the wxWidgets version to display
+    wxString description = wxString::Format("wxWidgets %s", wxVERSION_NUM_DOT_STRING);
+    // create a copyright notice that uses the year that this file was compiled
+    wxString year(__DATE__);
+    wxString copyrightLabel = wxString::Format("%s%s wxWidgets. %s",
+        wxString::FromUTF8("\xc2\xa9"), year.Mid(year.Length() - 4),
+        "All rights reserved.");
+
+    // draw the (white) labels inside of our orange box (at the bottom of the splashscreen)
+    memDc.SetTextForeground(*wxWHITE);
+    // draw the "wxWidget" label on the left side, vertically centered.
+    // note that we deflate the banner rect a little bit horizontally
+    // so that the text has some padding to its left.
+    memDc.DrawLabel(description, bannerRect.Deflate(5, 0), wxALIGN_CENTRE_VERTICAL|wxALIGN_LEFT);
+
+    // draw the copyright label on the right side
+    memDc.SetFont(wxFontInfo(8));
+    memDc.DrawLabel(copyrightLabel, bannerRect.Deflate(5, 0), wxALIGN_CENTRE_VERTICAL | wxALIGN_RIGHT);
+}
+
+
 // ----------------------------------------------------------------------------
 // main frame
 // ----------------------------------------------------------------------------