Add a simple unit test for wxHtmlPrintout pagination logic

Verify that the number of pages to be printed is as expected.

tests/Makefile.in

@@ -243,6 +243,7 @@ TEST_GUI_OBJECTS =  \
 	test_gui_rawbmp.o \
 	test_gui_htmlparser.o \
 	test_gui_htmlwindow.o \
+	test_gui_htmprint.o \
 	test_gui_accelentry.o \
 	test_gui_menu.o \
 	test_gui_guifuncs.o \
@@ -997,6 +998,9 @@ test_gui_htmlparser.o: $(srcdir)/html/htmlparser.cpp $(TEST_GUI_ODEP)
 test_gui_htmlwindow.o: $(srcdir)/html/htmlwindow.cpp $(TEST_GUI_ODEP)
 	$(CXXC) -c -o $@ $(TEST_GUI_CXXFLAGS) $(srcdir)/html/htmlwindow.cpp
 
+test_gui_htmprint.o: $(srcdir)/html/htmprint.cpp $(TEST_GUI_ODEP)
+	$(CXXC) -c -o $@ $(TEST_GUI_CXXFLAGS) $(srcdir)/html/htmprint.cpp
+
 test_gui_accelentry.o: $(srcdir)/menu/accelentry.cpp $(TEST_GUI_ODEP)
 	$(CXXC) -c -o $@ $(TEST_GUI_CXXFLAGS) $(srcdir)/menu/accelentry.cpp
 

tests/html/htmprint.cpp

@@ -0,0 +1,82 @@
+///////////////////////////////////////////////////////////////////////////////
+// Name:        tests/html/htmprint.cpp
+// Purpose:     wxHtmlPrintout tests
+// Author:      Vadim Zeitlin
+// Created:     2018-05-22
+// Copyright:   (c) 2018 Vadim Zeitlin <vadim@wxwidgets.org>
+///////////////////////////////////////////////////////////////////////////////
+
+// ----------------------------------------------------------------------------
+// headers
+// ----------------------------------------------------------------------------
+
+#include "testprec.h"
+
+#if wxUSE_HTML
+
+#ifdef __BORLANDC__
+    #pragma hdrstop
+#endif
+
+#ifndef WX_PRECOMP
+    #include "wx/dcmemory.h"
+#endif // WX_PRECOMP
+
+#include "wx/html/htmprint.h"
+
+namespace
+{
+
+// Return the number of pages in the printout.
+int CountPages(wxHtmlPrintout& pr)
+{
+    REQUIRE_NOTHROW( pr.OnPreparePrinting() );
+
+    int pageMin = -1,
+        pageMax = -1,
+        selFrom = -1,
+        selTo   = -1;
+    REQUIRE_NOTHROW( pr.GetPageInfo(&pageMin, &pageMax, &selFrom, &selTo) );
+
+    // This should be always the case.
+    CHECK( pageMin == 1 );
+
+    // Return the really interesting value to the caller.
+    return pageMax;
+}
+
+} // anonymous namespace
+
+TEST_CASE("wxHtmlPrintout::Pagination", "[html][print]")
+{
+    wxHtmlPrintout pr;
+
+    wxBitmap bmp(1000, 1000);
+    wxMemoryDC dc(bmp);
+    pr.SetUp(dc);
+
+    // Empty or short HTML documents should be printed on a single page only.
+    CHECK( CountPages(pr) == 1 );
+
+    pr.SetHtmlText("<p>Hello world!</p>");
+    CHECK( CountPages(pr) == 1 );
+
+    // This one should be too big to fit on a single page.
+    pr.SetHtmlText
+       (
+            "<img width=\"100\" height=\"600\" src=\"dummy\"/>"
+            "<br/>"
+            "<img width=\"100\" height=\"600\" src=\"dummy\"/>"
+       );
+    CHECK( CountPages(pr) == 2 );
+
+    // Special case: normally images are not split, but if the image height is
+    // greater than the page height, it should be.
+    pr.SetHtmlText
+       (
+            "<img width=\"100\" height=\"2500\" src=\"dummy\"/>"
+       );
+    CHECK( CountPages(pr) == 3 );
+}
+
+#endif //wxUSE_HTML

tests/makefile.bcc

@@ -229,6 +229,7 @@ TEST_GUI_OBJECTS =  \
 	$(OBJS)\test_gui_rawbmp.obj \
 	$(OBJS)\test_gui_htmlparser.obj \
 	$(OBJS)\test_gui_htmlwindow.obj \
+	$(OBJS)\test_gui_htmprint.obj \
 	$(OBJS)\test_gui_accelentry.obj \
 	$(OBJS)\test_gui_menu.obj \
 	$(OBJS)\test_gui_guifuncs.obj \
@@ -1050,6 +1051,9 @@ $(OBJS)\test_gui_htmlparser.obj: .\html\htmlparser.cpp
 $(OBJS)\test_gui_htmlwindow.obj: .\html\htmlwindow.cpp
 	$(CXX) -q -c -P -o$@ $(TEST_GUI_CXXFLAGS) .\html\htmlwindow.cpp
 
+$(OBJS)\test_gui_htmprint.obj: .\html\htmprint.cpp
+	$(CXX) -q -c -P -o$@ $(TEST_GUI_CXXFLAGS) .\html\htmprint.cpp
+
 $(OBJS)\test_gui_accelentry.obj: .\menu\accelentry.cpp
 	$(CXX) -q -c -P -o$@ $(TEST_GUI_CXXFLAGS) .\menu\accelentry.cpp
 

tests/makefile.gcc

@@ -224,6 +224,7 @@ TEST_GUI_OBJECTS =  \
 	$(OBJS)\test_gui_rawbmp.o \
 	$(OBJS)\test_gui_htmlparser.o \
 	$(OBJS)\test_gui_htmlwindow.o \
+	$(OBJS)\test_gui_htmprint.o \
 	$(OBJS)\test_gui_accelentry.o \
 	$(OBJS)\test_gui_menu.o \
 	$(OBJS)\test_gui_guifuncs.o \
@@ -1027,6 +1028,9 @@ $(OBJS)\test_gui_htmlparser.o: ./html/htmlparser.cpp
 $(OBJS)\test_gui_htmlwindow.o: ./html/htmlwindow.cpp
 	$(CXX) -c -o $@ $(TEST_GUI_CXXFLAGS) $(CPPDEPS) $<
 
+$(OBJS)\test_gui_htmprint.o: ./html/htmprint.cpp
+	$(CXX) -c -o $@ $(TEST_GUI_CXXFLAGS) $(CPPDEPS) $<
+
 $(OBJS)\test_gui_accelentry.o: ./menu/accelentry.cpp
 	$(CXX) -c -o $@ $(TEST_GUI_CXXFLAGS) $(CPPDEPS) $<
 

tests/makefile.vc

@@ -235,6 +235,7 @@ TEST_GUI_OBJECTS =  \
 	$(OBJS)\test_gui_rawbmp.obj \
 	$(OBJS)\test_gui_htmlparser.obj \
 	$(OBJS)\test_gui_htmlwindow.obj \
+	$(OBJS)\test_gui_htmprint.obj \
 	$(OBJS)\test_gui_accelentry.obj \
 	$(OBJS)\test_gui_menu.obj \
 	$(OBJS)\test_gui_guifuncs.obj \
@@ -1229,6 +1230,9 @@ $(OBJS)\test_gui_htmlparser.obj: .\html\htmlparser.cpp
 $(OBJS)\test_gui_htmlwindow.obj: .\html\htmlwindow.cpp
 	$(CXX) /c /nologo /TP /Fo$@ $(TEST_GUI_CXXFLAGS) .\html\htmlwindow.cpp
 
+$(OBJS)\test_gui_htmprint.obj: .\html\htmprint.cpp
+	$(CXX) /c /nologo /TP /Fo$@ $(TEST_GUI_CXXFLAGS) .\html\htmprint.cpp
+
 $(OBJS)\test_gui_accelentry.obj: .\menu\accelentry.cpp
 	$(CXX) /c /nologo /TP /Fo$@ $(TEST_GUI_CXXFLAGS) .\menu\accelentry.cpp
 

tests/test.bkl

@@ -249,6 +249,7 @@
             image/rawbmp.cpp
             html/htmlparser.cpp
             html/htmlwindow.cpp
+            html/htmprint.cpp
             menu/accelentry.cpp
             menu/menu.cpp
             misc/guifuncs.cpp

tests/test_gui.vcxproj

@@ -535,6 +535,7 @@
     <ClCompile Include="graphics\measuring.cpp" />
     <ClCompile Include="html\htmlparser.cpp" />
     <ClCompile Include="html\htmlwindow.cpp" />
+    <ClCompile Include="html\htmprint.cpp" />
     <ClCompile Include="image\image.cpp" />
     <ClCompile Include="image\rawbmp.cpp" />
     <ClCompile Include="menu\accelentry.cpp" />

tests/test_gui.vcxproj.filters

@@ -293,6 +293,9 @@
     <ClCompile Include="graphics\graphmatrix.cpp">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="html\htmprint.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ResourceCompile Include="..\samples\sample.rc">

tests/test_vc7_test_gui.vcproj

@@ -439,6 +439,9 @@
 			<File
 				RelativePath=".\html\htmlwindow.cpp">
 			</File>
+			<File
+				RelativePath=".\html\htmprint.cpp">
+			</File>
 			<File
 				RelativePath=".\controls\hyperlinkctrltest.cpp">
 			</File>

tests/test_vc8_test_gui.vcproj

@@ -1054,6 +1054,10 @@
 				RelativePath=".\html\htmlwindow.cpp"
 				>
 			</File>
+			<File
+				RelativePath=".\html\htmprint.cpp"
+				>
+			</File>
 			<File
 				RelativePath=".\controls\hyperlinkctrltest.cpp"
 				>

tests/test_vc9_test_gui.vcproj

@@ -1026,6 +1026,10 @@
 				RelativePath=".\html\htmlwindow.cpp"
 				>
 			</File>
+			<File
+				RelativePath=".\html\htmprint.cpp"
+				>
+			</File>
 			<File
 				RelativePath=".\controls\hyperlinkctrltest.cpp"
 				>