Notify user less intrusively about overflow when previewing HTML printouts.

We used to show a modal dialog if the page didn't fit horizontally but this
was too intrusive when the user was just previewing the output and not really
printing it. Moreover, the question of the message box ("Print" or "Cancel")
simply didn't make sense in this case.

Fix both problems by not showing this dialog at all when previewing. Instead,
notify the user with a much less intrusive info bar in the preview window.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@64214 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/html/htmprint.cpp

@@ -31,6 +31,7 @@
 #include "wx/html/htmprint.h"
 #include "wx/wxhtml.h"
 #include "wx/wfstream.h"
+#include "wx/infobar.h"
 
 
 // default font size of normal text (HTML font size 0) for printing, in points:
@@ -225,8 +226,42 @@ void wxHtmlPrintout::AddFilter(wxHtmlFilter *filter)
 bool
 wxHtmlPrintout::CheckFit(const wxSize& pageArea, const wxSize& docArea) const
 {
-    if ( docArea.x > pageArea.x )
+    // Nothing to do if the contents fits horizontally.
+    if ( docArea.x <= pageArea.x )
+        return true;
+
+    // Otherwise warn the user more or less intrusively depending on whether
+    // we're previewing or printing:
+    if ( wxPrintPreview * const preview = GetPreview() )
     {
+        // Don't annoy the user too much when previewing by using info bar
+        // instead of a dialog box.
+#if wxUSE_INFOBAR
+        wxFrame * const parent = preview->GetFrame();
+        wxCHECK_MSG( parent, false, "No parent preview frame?" );
+
+        wxSizer * const sizer = parent->GetSizer();
+        wxCHECK_MSG( sizer, false, "Preview frame should be using sizers" );
+
+        wxInfoBar * const bar = new wxInfoBar(parent);
+        sizer->Add(bar, wxSizerFlags().Expand());
+
+        // Note that the message here is similar to the one below but not
+        // exactly the same, notably we don't use the document title here
+        // because it's already clear which document it pertains to and the
+        // title may be long enough to make the text not fit in the window.
+        bar->ShowMessage
+             (
+              _("This document doesn't fit on the page horizontally and "
+                "will be truncated when it is printed."),
+              wxICON_WARNING
+             );
+#endif // wxUSE_INFOBAR
+    }
+    else // We're going to really print and not just preview.
+    {
+        // This is our last chance to warn the user that the output will be
+        // mangled so do show a message box.
         wxMessageDialog
             dlg
             (
@@ -323,7 +358,7 @@ void wxHtmlPrintout::OnPreparePrinting()
 
     if ( CheckFit(wxSize(printAreaW, printAreaH),
                   wxSize(m_Renderer->GetTotalWidth(),
-                         m_Renderer->GetTotalHeight())) )
+                         m_Renderer->GetTotalHeight())) || IsPreview() )
     {
         // do paginate the document
         CountPages();