vlbox.cpp

来自「A*算法 A*算法 A*算法 A*算法A*算法A*算法」· C++ 代码 · 共 667 行 · 第 1/2 页

///////////////////////////////////////////////////////////////////////////////
// Name:        generic/vlbox.cpp
// Purpose:     implementation of wxVListBox
// Author:      Vadim Zeitlin
// Modified by:
// Created:     31.05.03
// RCS-ID:      $Id: vlbox.cpp,v 1.22.2.1 2006/01/18 09:50:37 JS Exp $
// Copyright:   (c) 2003 Vadim Zeitlin <[e-mail]>
// License:     wxWindows license
///////////////////////////////////////////////////////////////////////////////

// ============================================================================
// declarations
// ============================================================================

// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------

// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"

#ifdef __BORLANDC__
    #pragma hdrstop
#endif

#if wxUSE_LISTBOX

#ifndef WX_PRECOMP
    #include "wx/settings.h"
    #include "wx/dcclient.h"
#endif //WX_PRECOMP

#include "wx/vlbox.h"
#include "wx/dcbuffer.h"
#include "wx/selstore.h"
#include "wx/bitmap.h"

// ----------------------------------------------------------------------------
// event tables
// ----------------------------------------------------------------------------

BEGIN_EVENT_TABLE(wxVListBox, wxVScrolledWindow)
    EVT_PAINT(wxVListBox::OnPaint)

    EVT_KEY_DOWN(wxVListBox::OnKeyDown)
    EVT_LEFT_DOWN(wxVListBox::OnLeftDown)
    EVT_LEFT_DCLICK(wxVListBox::OnLeftDClick)
END_EVENT_TABLE()

// ============================================================================
// implementation
// ============================================================================

IMPLEMENT_ABSTRACT_CLASS(wxVListBox, wxVScrolledWindow)

// ----------------------------------------------------------------------------
// wxVListBox creation
// ----------------------------------------------------------------------------

// due to ABI compatibility reasons, we need to declare double-buffer
// outside the class
static wxBitmap* gs_doubleBuffer = NULL;


void wxVListBox::Init()
{
    m_current =
    m_anchor = wxNOT_FOUND;
    m_selStore = NULL;
}

bool wxVListBox::Create(wxWindow *parent,
                        wxWindowID id,
                        const wxPoint& pos,
                        const wxSize& size,
                        long style,
                        const wxString& name)
{
    style |= wxWANTS_CHARS | wxFULL_REPAINT_ON_RESIZE;
    if ( !wxVScrolledWindow::Create(parent, id, pos, size, style, name) )
        return false;

    if ( style & wxLB_MULTIPLE )
        m_selStore = new wxSelectionStore;

    // make sure the native widget has the right colour since we do
    // transparent drawing by default
    SetBackgroundColour(GetBackgroundColour());
    m_colBgSel = wxSystemSettings::GetColour(wxSYS_COLOUR_HIGHLIGHT);

    // flicker-free drawing requires this
    SetBackgroundStyle(wxBG_STYLE_CUSTOM);

    return true;
}

wxVListBox::~wxVListBox()
{
    delete m_selStore;

    delete gs_doubleBuffer;
    gs_doubleBuffer = NULL;
}

void wxVListBox::SetItemCount(size_t count)
{
    if ( m_selStore )
    {
        // tell the selection store that our number of items has changed
        m_selStore->SetItemCount(count);
    }

    SetLineCount(count);
}

// ----------------------------------------------------------------------------
// selection handling
// ----------------------------------------------------------------------------

bool wxVListBox::IsSelected(size_t line) const
{
    return m_selStore ? m_selStore->IsSelected(line) : (int)line == m_current;
}

bool wxVListBox::Select(size_t item, bool select)
{
    wxCHECK_MSG( m_selStore, false,
                 _T("Select() may only be used with multiselection listbox") );

    wxCHECK_MSG( item < GetItemCount(), false,
                 _T("Select(): invalid item index") );

    bool changed = m_selStore->SelectItem(item, select);
    if ( changed )
    {
        // selection really changed
        RefreshLine(item);
    }

    DoSetCurrent(item);

    return changed;
}

bool wxVListBox::SelectRange(size_t from, size_t to)
{
    wxCHECK_MSG( m_selStore, false,
                 _T("SelectRange() may only be used with multiselection listbox") );

    // make sure items are in correct order
    if ( from > to )
    {
        size_t tmp = from;
        from = to;
        to = tmp;
    }

    wxCHECK_MSG( to < GetItemCount(), false,
                    _T("SelectRange(): invalid item index") );

    wxArrayInt changed;
    if ( !m_selStore->SelectRange(from, to, true, &changed) )
    {
        // too many items have changed, we didn't record them in changed array
        // so we have no choice but to refresh everything between from and to
        RefreshLines(from, to);
    }
    else // we've got the indices of the changed items
    {
        const size_t count = changed.GetCount();
        if ( !count )
        {
            // nothing changed
            return false;
        }

        // refresh just the lines which have really changed
        for ( size_t n = 0; n < count; n++ )
        {
            RefreshLine(changed[n]);
        }
    }

    // something changed
    return true;
}

bool wxVListBox::DoSelectAll(bool select)
{
    wxCHECK_MSG( m_selStore, false,
                 _T("SelectAll may only be used with multiselection listbox") );

    size_t count = GetItemCount();
    if ( count )
    {
        wxArrayInt changed;
        if ( !m_selStore->SelectRange(0, count - 1, select) ||
                !changed.IsEmpty() )
        {
            Refresh();

            // something changed
            return true;
        }
    }

    return false;
}

bool wxVListBox::DoSetCurrent(int current)
{
    wxASSERT_MSG( current == wxNOT_FOUND ||
                    (current >= 0 && (size_t)current < GetItemCount()),
                  _T("wxVListBox::DoSetCurrent(): invalid item index") );

    if ( current == m_current )
    {
        // nothing to do
        return false;
    }

    if ( m_current != wxNOT_FOUND )
        RefreshLine(m_current);

    m_current = current;

    if ( m_current != wxNOT_FOUND )
    {
        // if the line is not visible at all, we scroll it into view but we
        // don't need to refresh it -- it will be redrawn anyhow
        if ( !IsVisible(m_current) )
        {
            ScrollToLine(m_current);
        }
        else // line is at least partly visible
        {
            // it is, indeed, only partly visible, so scroll it into view to
            // make it entirely visible
            while ( (size_t)m_current == GetLastVisibleLine() &&
                    ScrollToLine(GetVisibleBegin()+1) );

            // but in any case refresh it as even if it was only partly visible
            // before we need to redraw it entirely as its background changed
            RefreshLine(m_current);
        }
    }

    return true;
}

void wxVListBox::SendSelectedEvent()
{
    wxASSERT_MSG( m_current != wxNOT_FOUND,
                    _T("SendSelectedEvent() shouldn't be called") );

    wxCommandEvent event(wxEVT_COMMAND_LISTBOX_SELECTED, GetId());
    event.SetEventObject(this);
    event.SetInt(m_current);

    (void)GetEventHandler()->ProcessEvent(event);
}

void wxVListBox::SetSelection(int selection)
{
    wxCHECK_RET( selection == wxNOT_FOUND ||
                  (selection >= 0 && (size_t)selection < GetItemCount()),
                  _T("wxVListBox::SetSelection(): invalid item index") );

    if ( HasMultipleSelection() )
    {
        Select(selection);
        m_anchor = selection;
    }

    DoSetCurrent(selection);
}

size_t wxVListBox::GetSelectedCount() const
{
    return m_selStore ? m_selStore->GetSelectedCount()
                      : m_current == wxNOT_FOUND ? 0 : 1;
}

int wxVListBox::GetFirstSelected(unsigned long& cookie) const
{
    cookie = 0;

    return GetNextSelected(cookie);
}

int wxVListBox::GetNextSelected(unsigned long& cookie) const
{
    wxCHECK_MSG( m_selStore, wxNOT_FOUND,
                  _T("GetFirst/NextSelected() may only be used with multiselection listboxes") );

    while ( cookie < GetItemCount() )
    {
        if ( IsSelected(cookie++) )
            return cookie - 1;
    }

    return wxNOT_FOUND;
}

// ----------------------------------------------------------------------------
// wxVListBox appearance parameters
// ----------------------------------------------------------------------------

void wxVListBox::SetMargins(const wxPoint& pt)
{
    if ( pt != m_ptMargins )
    {
        m_ptMargins = pt;

        Refresh();
    }
}

void wxVListBox::SetSelectionBackground(const wxColour& col)
{
    m_colBgSel = col;
}

// ----------------------------------------------------------------------------
// wxVListBox painting
// ----------------------------------------------------------------------------

wxCoord wxVListBox::OnGetLineHeight(size_t line) const
{
    return OnMeasureItem(line) + 2*m_ptMargins.y;
}

void wxVListBox::OnDrawSeparator(wxDC& WXUNUSED(dc),