Merge branch 'html-set-cell'

Make wxHTML API more flexible by allowing to operate on individual
wxHtmlContainerCell instead of only the entire HTML document text.

See https://github.com/wxWidgets/wxWidgets/pull/899

include/wx/html/htmlcell.h

@@ -445,7 +445,7 @@ protected:
 class WXDLLIMPEXP_HTML wxHtmlContainerCell : public wxHtmlCell
 {
 public:
-    wxHtmlContainerCell(wxHtmlContainerCell *parent);
+    explicit wxHtmlContainerCell(wxHtmlContainerCell *parent);
     virtual ~wxHtmlContainerCell();
 
     virtual void Layout(int w) wxOVERRIDE;
@@ -459,6 +459,11 @@ public:
     // insert cell at the end of m_Cells list
     void InsertCell(wxHtmlCell *cell);
 
+    // Detach a child cell. After calling this method, it's the caller
+    // responsibility to destroy this cell (possibly by calling InsertCell()
+    // with it to attach it elsewhere).
+    void Detach(wxHtmlCell *cell);
+
     // sets horizontal/vertical alignment
     void SetAlignHor(int al) {m_AlignHor = al; m_LastLayout = -1;}
     int GetAlignHor() const {return m_AlignHor;}

include/wx/html/htmprint.h

@@ -54,6 +54,11 @@ public:
     // (see wxFileSystem for detailed explanation)
     void SetHtmlText(const wxString& html, const wxString& basepath = wxEmptyString, bool isdir = true);
 
+    // Sets the HTML cell that will be rendered: this is more efficient than
+    // using text as it allows to parse it only once. Note that the cell will
+    // be modified by this call.
+    void SetHtmlCell(wxHtmlContainerCell& cell);
+
     // Sets fonts to be used when displaying HTML page. (if size null then default sizes used).
     void SetFonts(const wxString& normal_face, const wxString& fixed_face, const int *sizes = NULL);
 
@@ -79,11 +84,14 @@ public:
     int GetTotalHeight() const;
 
 private:
+    void DoSetHtmlCell(wxHtmlContainerCell* cell);
+
     wxDC *m_DC;
-    wxHtmlWinParser *m_Parser;
-    wxFileSystem *m_FS;
+    wxFileSystem m_FS;
+    wxHtmlWinParser m_Parser;
     wxHtmlContainerCell *m_Cells;
     int m_Width, m_Height;
+    bool m_ownsCells;
 
     wxDECLARE_NO_COPY_CLASS(wxHtmlDCRenderer);
 };

interface/wx/html/htmlcell.h

@@ -471,7 +471,21 @@ public:
     /**
         Constructor. @a parent is pointer to parent container or @NULL.
     */
-    wxHtmlContainerCell(wxHtmlContainerCell* parent);
+    explicit wxHtmlContainerCell(wxHtmlContainerCell* parent);
+
+    /**
+        Detach a child cell.
+
+        Detaching a cell removes it from this container and allows to reattach
+        it to another one by using InsertCell(). Alternatively, this method can
+        be used to selectively remove some elements of the HTML document tree
+        by deleting the cell after calling it.
+
+        @param cell Must be non-null and an immediate child of this cell.
+
+        @since 3.1.2
+     */
+    void Detach(wxHtmlCell* cell);
 
     /**
         Returns container's horizontal alignment.
@@ -506,6 +520,9 @@ public:
 
     /**
         Inserts a new cell into the container.
+
+        Note that the container takes ownership of the cell and will delete it
+        when it itself is destroyed.
     */
     void InsertCell(wxHtmlCell* cell);
 

interface/wx/html/htmprint.h

@@ -168,6 +168,19 @@ public:
                      const wxString& basepath = wxEmptyString,
                      bool isdir = true);
 
+    /**
+        Associate the given HTML contents to the renderer.
+
+        This is similar to SetHtmlText(), but is more efficient as the text can
+        be parsed only once, using wxHtmlParser::Parse(), and then passed to
+        wxHtmlDCRenderer multiple times or already reused for other purposes.
+
+        Note that @a cell will be modified (e.g. laid out) by this function.
+
+        @since 3.1.2
+     */
+    void SetHtmlCell(wxHtmlContainerCell& cell);
+
     /**
         Set size of output rectangle, in pixels. Note that you @b can't change
         width of the rectangle between calls to Render() !

src/html/htmlcell.cpp

@@ -1159,6 +1159,43 @@ void wxHtmlContainerCell::InsertCell(wxHtmlCell *f)
 
 
 
+void wxHtmlContainerCell::Detach(wxHtmlCell *cell)
+{
+    wxHtmlCell* const firstChild = GetFirstChild();
+    if ( cell == firstChild )
+    {
+        m_Cells = cell->GetNext();
+        if ( m_LastCell == cell )
+            m_LastCell = NULL;
+    }
+    else // Not the first child.
+    {
+        for ( wxHtmlCell* prev = firstChild;; )
+        {
+            wxHtmlCell* const next = prev->GetNext();
+
+            // We can't reach the end of the children list without finding this
+            // cell, normally.
+            wxCHECK_RET( next,  "Detaching cell which is not our child" );
+
+            if ( cell == next )
+            {
+                prev->SetNext(cell->GetNext());
+                if ( m_LastCell == cell )
+                    m_LastCell = prev;
+                break;
+            }
+
+            prev = next;
+        }
+    }
+
+    cell->SetParent(NULL);
+    cell->SetNext(NULL);
+}
+
+
+
 void wxHtmlContainerCell::SetAlign(const wxHtmlTag& tag)
 {
     wxString alg;

src/html/htmprint.cpp

@@ -70,9 +70,8 @@ wxHtmlDCRenderer::wxHtmlDCRenderer() : wxObject()
     m_DC = NULL;
     m_Width = m_Height = 0;
     m_Cells = NULL;
-    m_Parser = new wxHtmlWinParser();
-    m_FS = new wxFileSystem();
-    m_Parser->SetFS(m_FS);
+    m_ownsCells = false;
+    m_Parser.SetFS(&m_FS);
     SetStandardFonts(DEFAULT_PRINT_FONT_SIZE);
 }
 
@@ -80,9 +79,8 @@ wxHtmlDCRenderer::wxHtmlDCRenderer() : wxObject()
 
 wxHtmlDCRenderer::~wxHtmlDCRenderer()
 {
-    if (m_Cells) delete m_Cells;
-    if (m_Parser) delete m_Parser;
-    if (m_FS) delete m_FS;
+    if ( m_ownsCells )
+        delete m_Cells;
 }
 
 
@@ -90,7 +88,7 @@ wxHtmlDCRenderer::~wxHtmlDCRenderer()
 void wxHtmlDCRenderer::SetDC(wxDC *dc, double pixel_scale, double font_scale)
 {
     m_DC = dc;
-    m_Parser->SetDC(m_DC, pixel_scale, font_scale);
+    m_Parser.SetDC(m_DC, pixel_scale, font_scale);
 }
 
 
@@ -110,19 +108,38 @@ void wxHtmlDCRenderer::SetHtmlText(const wxString& html, const wxString& basepat
     wxCHECK_RET( m_DC, "SetDC() must be called before SetHtmlText()" );
     wxCHECK_RET( m_Width, "SetSize() must be called before SetHtmlText()" );
 
-    wxDELETE(m_Cells);
+    m_FS.ChangePathTo(basepath, isdir);
 
-    m_FS->ChangePathTo(basepath, isdir);
-    m_Cells = (wxHtmlContainerCell*) m_Parser->Parse(html);
+    wxHtmlContainerCell* const cell = (wxHtmlContainerCell*) m_Parser.Parse(html);
+    wxCHECK_RET( cell, "Failed to parse HTML" );
+
+    DoSetHtmlCell(cell);
+
+    m_ownsCells = true;
+}
+
+void wxHtmlDCRenderer::DoSetHtmlCell(wxHtmlContainerCell* cell)
+{
+    if ( m_ownsCells )
+        delete m_Cells;
+
+    m_Cells = cell;
     m_Cells->SetIndent(0, wxHTML_INDENT_ALL, wxHTML_UNITS_PIXELS);
     m_Cells->Layout(m_Width);
 }
 
+void wxHtmlDCRenderer::SetHtmlCell(wxHtmlContainerCell& cell)
+{
+    DoSetHtmlCell(&cell);
+
+    m_ownsCells = false;
+}
+
 
 void wxHtmlDCRenderer::SetFonts(const wxString& normal_face, const wxString& fixed_face,
                                 const int *sizes)
 {
-    m_Parser->SetFonts(normal_face, fixed_face, sizes);
+    m_Parser.SetFonts(normal_face, fixed_face, sizes);
 
     if ( m_Cells )
         m_Cells->Layout(m_Width);
@@ -133,7 +150,7 @@ void wxHtmlDCRenderer::SetStandardFonts(int size,
                                         const wxString& normal_face,
                                         const wxString& fixed_face)
 {
-    m_Parser->SetStandardFonts(size, normal_face, fixed_face);
+    m_Parser.SetStandardFonts(size, normal_face, fixed_face);
 
     if ( m_Cells )
         m_Cells->Layout(m_Width);

tests/html/htmlparser.cpp

@@ -24,37 +24,8 @@
 
 #include "wx/html/winpars.h"
 
-// ----------------------------------------------------------------------------
-// test class
-// ----------------------------------------------------------------------------
-
-class HtmlParserTestCase : public CppUnit::TestCase
-{
-public:
-    HtmlParserTestCase() { }
-
-private:
-    CPPUNIT_TEST_SUITE( HtmlParserTestCase );
-        CPPUNIT_TEST( Invalid );
-    CPPUNIT_TEST_SUITE_END();
-
-    void Invalid();
-
-    wxDECLARE_NO_COPY_CLASS(HtmlParserTestCase);
-};
-
-// register in the unnamed registry so that these tests are run by default
-CPPUNIT_TEST_SUITE_REGISTRATION( HtmlParserTestCase );
-
-// also include in its own registry so that these tests can be run alone
-CPPUNIT_TEST_SUITE_NAMED_REGISTRATION( HtmlParserTestCase, "HtmlParserTestCase" );
-
-// ----------------------------------------------------------------------------
-// tests themselves
-// ----------------------------------------------------------------------------
-
 // Test that parsing invalid HTML simply fails but doesn't crash for example.
-void HtmlParserTestCase::Invalid()
+TEST_CASE("wxHtmlParser::ParseInvalid", "[html][parser][error]")
 {
     class NullParser : public wxHtmlWinParser
     {
@@ -75,4 +46,64 @@ void HtmlParserTestCase::Invalid()
     p.Parse("<!---");
 }
 
+TEST_CASE("wxHtmlCell::Detach", "[html][cell]")
+{
+    wxMemoryDC dc;
+
+    wxHtmlContainerCell* const top = new wxHtmlContainerCell(NULL);
+    wxHtmlContainerCell* const cont = new wxHtmlContainerCell(NULL);
+    wxHtmlCell* const cell1 = new wxHtmlWordCell("Hello", dc);
+    wxHtmlCell* const cell2 = new wxHtmlColourCell(*wxRED);
+    wxHtmlCell* const cell3 = new wxHtmlWordCell("world", dc);
+
+    cont->InsertCell(cell1);
+    cont->InsertCell(cell2);
+    cont->InsertCell(cell3);
+    top->InsertCell(cont);
+
+    SECTION("container")
+    {
+        top->Detach(cont);
+        CHECK( top->GetFirstChild() == NULL );
+
+        delete cont;
+    }
+
+    SECTION("first-child")
+    {
+        cont->Detach(cell1);
+        CHECK( cont->GetFirstChild() == cell2 );
+
+        delete cell1;
+    }
+
+    SECTION("middle-child")
+    {
+        cont->Detach(cell2);
+        CHECK( cont->GetFirstChild() == cell1 );
+        CHECK( cell1->GetNext() == cell3 );
+
+        delete cell2;
+    }
+
+    SECTION("last-child")
+    {
+        cont->Detach(cell3);
+        CHECK( cont->GetFirstChild() == cell1 );
+        CHECK( cell1->GetNext() == cell2 );
+        CHECK( cell2->GetNext() == NULL );
+
+        delete cell3;
+    }
+
+    SECTION("invalid")
+    {
+        WX_ASSERT_FAILS_WITH_ASSERT_MESSAGE
+        (
+            "Expected assertion for detaching non-child",
+            top->Detach(cell1);
+        );
+    }
+}
+
 #endif //wxUSE_HTML