added wxVListBox using wxVScrolledWindow and wxHtmlListBox using it

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@20808 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
2003-06-01 13:35:26 +00:00
parent 6fac75c355
commit e0c6027b5a
10 changed files with 1034 additions and 2 deletions
--- a/src/generic/htmllbox.cpp
+++ b/src/generic/htmllbox.cpp
@@ -0,0 +1,185 @@
+///////////////////////////////////////////////////////////////////////////////
+// Name:        generic/htmllbox.cpp
+// Purpose:     implementation of wxHtmlListBox
+// Author:      Vadim Zeitlin
+// Modified by:
+// Created:     31.05.03
+// RCS-ID:      $Id$
+// Copyright:   (c) 2003 Vadim Zeitlin <vadim@wxwindows.org>
+// License:     wxWindows license
+///////////////////////////////////////////////////////////////////////////////
+
+// ============================================================================
+// declarations
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// headers
+// ----------------------------------------------------------------------------
+
+// For compilers that support precompilation, includes "wx.h".
+#include "wx/wxprec.h"
+
+#ifdef __BORLANDC__
+    #pragma hdrstop
+#endif
+
+#ifndef WX_PRECOMP
+#endif //WX_PRECOMP
+
+#include "wx/htmllbox.h"
+
+#include "wx/html/htmlcell.h"
+#include "wx/html/winpars.h"
+
+// ----------------------------------------------------------------------------
+// private classes
+// ----------------------------------------------------------------------------
+
+// this class is used by wxHtmlListBox to cache the parsed representation of
+// the items to avoid doing it anew each time an item must be drawn
+//
+// TODO: extend the class to cache more than item
+class wxHtmlListBoxCache
+{
+public:
+    wxHtmlListBoxCache() { m_cell = NULL; }
+    ~wxHtmlListBoxCache() { delete m_cell; }
+
+    // returns true if we already have this item cached
+    bool Has(size_t n) const { return m_cell && n == m_item; }
+
+    // ensure that the item is cached
+    void Store(size_t n, wxHtmlCell *cell)
+    {
+        m_item = n;
+
+        delete m_cell;
+        m_cell = cell;
+    }
+
+    // return the cached cell for this index or NULL if none
+    wxHtmlCell *Get(size_t n) const
+    {
+        // we could be reading uninitialized m_item here but the code is still
+        // correct
+        return n == m_item ? m_cell : NULL;
+    }
+
+private:
+    // the parsed representation of the cached item or NULL
+    wxHtmlCell *m_cell;
+
+    // the index of the currently cached item (only valid if m_cell != NULL)
+    size_t m_item;
+};
+
+// ============================================================================
+// implementation
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// wxHtmlListBox creation
+// ----------------------------------------------------------------------------
+
+void wxHtmlListBox::Init()
+{
+    m_htmlParser = NULL;
+    m_cache = new wxHtmlListBoxCache;
+}
+
+bool wxHtmlListBox::Create(wxWindow *parent,
+                           wxWindowID id,
+                           const wxPoint& pos,
+                           const wxSize& size,
+                           size_t countItems,
+                           long style,
+                           const wxString& name)
+{
+    return wxVListBox::Create(parent, id, pos, size, countItems, style, name);
+}
+
+wxHtmlListBox::~wxHtmlListBox()
+{
+    delete m_cache;
+    if ( m_htmlParser )
+    {
+        delete m_htmlParser->GetDC();
+        delete m_htmlParser;
+    }
+}
+
+// ----------------------------------------------------------------------------
+// wxHtmlListBox items markup
+// ----------------------------------------------------------------------------
+
+wxString wxHtmlListBox::OnGetItemMarkup(size_t n) const
+{
+    // we don't even need to wrap the value returned by OnGetItem() inside
+    // "<html><body>" and "</body></html>" because wxHTML can parse it even
+    // without these tags
+    return OnGetItem(n);
+}
+
+void wxHtmlListBox::CacheItem(size_t n) const
+{
+    if ( !m_cache->Has(n) )
+    {
+        if ( !m_htmlParser )
+        {
+            wxHtmlListBox *self = wxConstCast(this, wxHtmlListBox);
+
+            self->m_htmlParser = new wxHtmlWinParser;
+            m_htmlParser->SetDC(new wxClientDC(self));
+        }
+
+        wxHtmlContainerCell *cell = (wxHtmlContainerCell *)m_htmlParser->
+                Parse(OnGetItemMarkup(n));
+        wxCHECK_RET( cell, _T("wxHtmlParser::Parse() returned NULL?") );
+
+        cell->Layout(GetClientSize().x);
+
+        m_cache->Store(n, cell);
+    }
+}
+
+// ----------------------------------------------------------------------------
+// wxHtmlListBox implementation of wxVListBox pure virtuals
+// ----------------------------------------------------------------------------
+
+void wxHtmlListBox::OnDrawItem(wxDC& dc, const wxRect& rect, size_t n) const
+{
+    CacheItem(n);
+
+    wxHtmlCell *cell = m_cache->Get(n);
+    wxCHECK_RET( cell, _T("this cell should be cached!") );
+
+    // draw the selected cell in selected state
+    if ( IsSelected(n) )
+    {
+        wxHtmlSelection htmlSel;
+        htmlSel.Set(wxPoint(0, 0), cell, wxPoint(INT_MAX, INT_MAX), cell);
+        wxHtmlRenderingState htmlRendState(&htmlSel);
+        htmlRendState.SetSelectionState(wxHTML_SEL_IN);
+        cell->Draw(dc, rect.x, rect.y, 0, INT_MAX, htmlRendState);
+    }
+    else
+    {
+        // note that we can't stop drawing exactly at the window boundary as then
+        // even the visible cells part could be not drawn, so always draw the
+        // entire cell
+        wxHtmlRenderingState htmlRendState(NULL);
+        cell->Draw(dc, rect.x, rect.y, 0, INT_MAX, htmlRendState);
+    }
+}
+
+wxCoord wxHtmlListBox::OnMeasureItem(size_t n) const
+{
+    CacheItem(n);
+
+    wxHtmlCell *cell = m_cache->Get(n);
+    wxCHECK_MSG( cell, 0, _T("this cell should be cached!") );
+
+    return cell->GetHeight() + cell->GetDescent();
+}
+