tests/graphics/measuring.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        tests/graphics/measuring.cpp
   3 // Purpose:     Tests for wxGraphicsRenderer::CreateMeasuringContext
   4 // Author:      Kevin Ollivier, Vadim Zeitlin (non wxGC parts)
   5 // Created:     2008-02-12
   6 // RCS-ID:      $Id$
   7 // Copyright:   (c) 2008 Kevin Ollivier <kevino@theolliviers.com>
   8 //              (c) 2012 Vadim Zeitlin <vadim@wxwidgets.org>
   9 ///////////////////////////////////////////////////////////////////////////////
  10
  11 // ----------------------------------------------------------------------------
  12 // headers
  13 // ----------------------------------------------------------------------------
  14
  15 #include "testprec.h"
  16
  17 #ifdef __BORLANDC__
  18     #pragma hdrstop
  19 #endif
  20
  21 #ifndef WX_PRECOMP
  22     #include "wx/app.h"
  23     #include "wx/font.h"
  24     #include "wx/window.h"
  25 #endif // WX_PRECOMP
  26
  27 // wxCairoRenderer::CreateMeasuringContext() is not implement for wxX11
  28 #if wxUSE_GRAPHICS_CONTEXT && !defined(__WXX11__)
  29     #include "wx/graphics.h"
  30     #define TEST_GC
  31 #endif
  32
  33 #include "wx/dcclient.h"
  34 #include "wx/dcps.h"
  35 #include "wx/metafile.h"
  36
  37 // ----------------------------------------------------------------------------
  38 // test class
  39 // ----------------------------------------------------------------------------
  40
  41 class MeasuringTextTestCase : public CppUnit::TestCase
  42 {
  43 public:
  44     MeasuringTextTestCase() { }
  45
  46 private:
  47     CPPUNIT_TEST_SUITE( MeasuringTextTestCase );
  48         CPPUNIT_TEST( DCGetTextExtent );
  49         CPPUNIT_TEST( WindowGetTextExtent );
  50         CPPUNIT_TEST( GetPartialTextExtent );
  51 #ifdef TEST_GC
  52         CPPUNIT_TEST( GraphicsGetTextExtent );
  53 #endif // TEST_GC
  54     CPPUNIT_TEST_SUITE_END();
  55
  56     void DCGetTextExtent();
  57     void WindowGetTextExtent();
  58
  59     void GetPartialTextExtent();
  60
  61 #ifdef TEST_GC
  62     void GraphicsGetTextExtent();
  63 #endif // TEST_GC
  64
  65     DECLARE_NO_COPY_CLASS(MeasuringTextTestCase)
  66 };
  67
  68 // register in the unnamed registry so that these tests are run by default
  69 CPPUNIT_TEST_SUITE_REGISTRATION( MeasuringTextTestCase );
  70
  71 // also include in its own registry so that these tests can be run alone
  72 CPPUNIT_TEST_SUITE_NAMED_REGISTRATION( MeasuringTextTestCase, "MeasuringTextTestCase" );
  73
  74 // ----------------------------------------------------------------------------
  75 // helper for XXXTextExtent() methods
  76 // ----------------------------------------------------------------------------
  77
  78 template <typename T>
  79 struct GetTextExtentTester
  80 {
  81     // Constructor runs a couple of simple tests for GetTextExtent().
  82     GetTextExtentTester(const T& obj)
  83     {
  84         // Test that getting the height only doesn't crash.
  85         int y;
  86         obj.GetTextExtent("H", NULL, &y);
  87
  88         CPPUNIT_ASSERT( y > 1 );
  89
  90         wxSize size = obj.GetTextExtent("Hello");
  91         CPPUNIT_ASSERT( size.x > 1 );
  92         CPPUNIT_ASSERT_EQUAL( y, size.y );
  93     }
  94 };
  95
  96 // ----------------------------------------------------------------------------
  97 // tests themselves
  98 // ----------------------------------------------------------------------------
  99
 100 void MeasuringTextTestCase::DCGetTextExtent()
 101 {
 102     wxClientDC dc(wxTheApp->GetTopWindow());
 103
 104     GetTextExtentTester<wxClientDC> testDC(dc);
 105
 106     int w;
 107     dc.GetMultiLineTextExtent("Good\nbye", &w, NULL);
 108     const wxSize sz = dc.GetTextExtent("Good");
 109     CPPUNIT_ASSERT_EQUAL( sz.x, w );
 110
 111     CPPUNIT_ASSERT( dc.GetMultiLineTextExtent("Good\nbye").y >= 2*sz.y );
 112
 113     // Test the functions with some other DC kinds also.
 114 #if wxUSE_PRINTING_ARCHITECTURE && wxUSE_POSTSCRIPT
 115     wxPostScriptDC psdc;
 116     // wxPostScriptDC doesn't have any font set by default but its
 117     // GetTextExtent() requires one to be set. This is probably a bug and we
 118     // should set the default font in it implicitly but for now just work
 119     // around it.
 120     psdc.SetFont(*wxNORMAL_FONT);
 121     GetTextExtentTester<wxPostScriptDC> testPS(psdc);
 122 #endif
 123
 124 #if wxUSE_ENH_METAFILE
 125     wxEnhMetaFileDC metadc;
 126     GetTextExtentTester<wxEnhMetaFileDC> testMF(metadc);
 127 #endif
 128 }
 129
 130 void MeasuringTextTestCase::WindowGetTextExtent()
 131 {
 132     wxWindow* const win = wxTheApp->GetTopWindow();
 133
 134     GetTextExtentTester<wxWindow> testWin(*win);
 135 }
 136
 137 void MeasuringTextTestCase::GetPartialTextExtent()
 138 {
 139     wxClientDC dc(wxTheApp->GetTopWindow());
 140
 141     wxArrayInt widths;
 142     CPPUNIT_ASSERT( dc.GetPartialTextExtents("Hello", widths) );
 143     CPPUNIT_ASSERT_EQUAL( 5, widths.size() );
 144     CPPUNIT_ASSERT_EQUAL( widths[0], dc.GetTextExtent("H").x );
 145     CPPUNIT_ASSERT_EQUAL( widths[4], dc.GetTextExtent("Hello").x );
 146 }
 147
 148 #ifdef TEST_GC
 149
 150 void MeasuringTextTestCase::GraphicsGetTextExtent()
 151 {
 152     wxGraphicsRenderer* renderer = wxGraphicsRenderer::GetDefaultRenderer();
 153     CPPUNIT_ASSERT(renderer);
 154     wxGraphicsContext* context = renderer->CreateMeasuringContext();
 155     CPPUNIT_ASSERT(context);
 156     wxFont font(12, wxFONTFAMILY_DEFAULT, wxFONTSTYLE_NORMAL, wxFONTWEIGHT_NORMAL);
 157     CPPUNIT_ASSERT(font.IsOk());
 158     context->SetFont(font, *wxBLACK);
 159     double width, height, descent, externalLeading = 0.0;
 160     context->GetTextExtent("x", &width, &height, &descent, &externalLeading);
 161
 162     // TODO: Determine a way to make these tests more robust.
 163     CPPUNIT_ASSERT(width > 0.0);
 164     CPPUNIT_ASSERT(height > 0.0);
 165
 166 }
 167
 168 #endif // TEST_GC