simplify code so it always returns the same object

[wxWidgets.git] / src / os2 / checklst.cpp

///////////////////////////////////////////////////////////////////////////////
// Name:        src/os2/checklst.cpp
// Purpose:     implementation of wxCheckListBox class
// Author:      David Webster
// Modified by:
// Created:     10/13/99
// RCS-ID:      $Id$
// Copyright:   (c) David Webster
// Licence:     wxWindows licence
///////////////////////////////////////////////////////////////////////////////

// ============================================================================
// headers & declarations
// ============================================================================

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

#if wxUSE_CHECKLISTBOX && wxUSE_OWNER_DRAWN

#include "wx/checklst.h"

#ifndef WX_PRECOMP
    #include "wx/object.h"
    #include "wx/log.h"
    #include "wx/window.h"
    #include "wx/dcmemory.h"
    #include "wx/dcscreen.h"
    #include "wx/settings.h"
    #include "wx/listbox.h"
    #include "wx/bitmap.h"
    #include "wx/colour.h"
    #include "wx/font.h"
#endif

#include "wx/os2/dc.h"
#include "wx/ownerdrw.h"

#define INCL_PM
#include <os2.h>

// ----------------------------------------------------------------------------
// constants for base class
// ----------------------------------------------------------------------------

static const int CHECK_MARK_WIDTH = 15;

// ----------------------------------------------------------------------------
// private functions
// ----------------------------------------------------------------------------

// get item (converted to right type)
#define GetItem(n)    ((wxCheckListBoxItem *)(GetItem(n)))

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

// ----------------------------------------------------------------------------
// declaration and implementation of wxCheckListBoxItem class
// ----------------------------------------------------------------------------

class wxCheckListBoxItem : public wxOwnerDrawn
{
    friend class wxCheckListBox;
public:
    //
    // ctor
    //
    wxCheckListBoxItem(wxCheckListBox* pParent, size_t nIndex);

    //
    // Drawing functions
    //
    virtual bool OnDrawItem( wxDC&         rDc,
                             const wxRect& rRect,
                             wxODAction    eAct,
                             wxODStatus    eStat
                           );

    //
    // Simple accessors
    //
    bool IsChecked(void) const  { return m_bChecked; }
    void Check(bool bCheck);
    void Toggle(void) { Check(!IsChecked()); }

    virtual wxString GetName() const { return m_pParent->GetString(m_nIndex); }

private:
    bool            m_bChecked;
    wxCheckListBox* m_pParent;
    size_t          m_nIndex;
}; // end of CLASS wxCheckListBoxItem



wxCheckListBoxItem::wxCheckListBoxItem(wxCheckListBox* pParent, size_t nIndex)
                   :wxOwnerDrawn( wxEmptyString, true /* checkable */ )
{
    m_bChecked = false;
    m_pParent  = pParent;
    m_nIndex   = nIndex;

    //
    // We don't initialize m_nCheckHeight/Width vars because it's
    // done in OnMeasure while they are used only in OnDraw and we
    // know that there will always be OnMeasure before OnDraw
    //
    SetMarginWidth(CHECK_MARK_WIDTH);
} // end of wxCheckListBoxItem::wxCheckListBoxItem



bool wxCheckListBoxItem::OnDrawItem ( wxDC& rDc,
                                      const wxRect& rRect,
                                      wxODAction eAct,
                                      wxODStatus eStat )
{
    wxRect vRect = rRect;


    wxPMDCImpl *impl = (wxPMDCImpl*) rDc.GetImpl();
    ::WinQueryWindowRect( m_pParent->GetHWND(), &impl->m_vRclPaint );
    if (IsChecked())
        eStat = (wxOwnerDrawn::wxODStatus)(eStat | wxOwnerDrawn::wxODChecked);

    //
    // Unfortunately PM doesn't quite get the text position exact.  We need to alter
    // it down and to the right, just a little bit.  The coords in rRect are OS/2
    // coords not wxWidgets coords.
    //
    vRect.x += 5;
    vRect.y -= 3;
    if (wxOwnerDrawn::OnDrawItem( rDc, vRect, eAct, eStat))
    {
        size_t    nCheckWidth  = CHECK_MARK_WIDTH;
        size_t    nCheckHeight = m_pParent->GetItemHeight();
        int       nParentHeight;
        int       nX = rRect.GetX();
        int       nY = rRect.GetY();
        int       nOldY = nY;
        wxColour  vColour(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW));
        wxPen     vPenBack;
        wxPen     vPenPrev;

        m_pParent->GetSize( NULL, &nParentHeight);

        nY = nParentHeight - nY - nCheckHeight;
        vPenBack = wxPen(vColour, 1, wxSOLID);

        //
        // Erase the 1-pixel border
        //
        rDc.SetPen(vPenBack);
        rDc.DrawRectangle( nX, nY, nCheckWidth, nCheckHeight );

        //
        // Now we draw the smaller rectangle
        //
        nY++;
        nCheckWidth  -= 2;
        nCheckHeight -= 2;

        //
        // Draw hollow gray rectangle
        //
        rDc.SetPen(*wxGREY_PEN);
        rDc.DrawRectangle( nX, nY, nCheckWidth, nCheckHeight );

        nX++;
        if (IsChecked())
        {
            //
            // Draw the check by loading the sys standard bitmap and drawing it
            //
            HBITMAP hChkBmp = ::WinGetSysBitmap( HWND_DESKTOP, SBMP_MENUCHECK );
            POINTL  vPoint = {nX, nOldY + 3};
            wxPMDCImpl *impl = (wxPMDCImpl*) rDc.GetImpl();
            ::WinDrawBitmap( impl->GetHPS(),
                             hChkBmp,
                             NULL,
                             &vPoint,
                             NULL,
                             NULL,
                             DBM_NORMAL
                           );
        }
        return true;
    }
    return false;
} // end of wxCheckListBoxItem::OnDrawItem

//
// Change the state of the item and redraw it
//
void wxCheckListBoxItem::Check( bool bCheck )
{
    m_bChecked = bCheck;

    //
    // Index may be chanegd because new items were added/deleted
    //
    if (m_pParent->GetItemIndex(this) != (int)m_nIndex)
    {
        //
        // Update it
        //
        int nIndex = m_pParent->GetItemIndex(this);

        wxASSERT_MSG(nIndex != wxNOT_FOUND, wxT("what does this item do here?"));

        m_nIndex = (size_t)nIndex;
    }


    wxCommandEvent vEvent( wxEVT_COMMAND_CHECKLISTBOX_TOGGLED,m_pParent->GetId());

    vEvent.SetInt(m_nIndex);
    vEvent.SetEventObject(m_pParent);
    m_pParent->ProcessCommand(vEvent);
} // end of wxCheckListBoxItem::Check


// ----------------------------------------------------------------------------
// implementation of wxCheckListBox class
// ----------------------------------------------------------------------------

// define event table
// ------------------
BEGIN_EVENT_TABLE(wxCheckListBox, wxListBox)
    EVT_CHAR(wxCheckListBox::OnChar)
    EVT_LEFT_DOWN(wxCheckListBox::OnLeftClick)
END_EVENT_TABLE()



//
// Control creation
// ----------------
//

//
// Default ctor: use Create() to really create the control
//
wxCheckListBox::wxCheckListBox()
               :wxCheckListBoxBase()
{
} // end of wxCheckListBox::wxCheckListBox

//
// Ctor which creates the associated control
//
wxCheckListBox::wxCheckListBox ( wxWindow* pParent,
                                 wxWindowID vId,
                                 const wxPoint& rPos,
                                 const wxSize& rSize,
                                 int nStrings,
                                 const wxString asChoices[],
                                 long lStyle,
                                 const wxValidator& rVal,
                                 const wxString& rsName)
               :wxCheckListBoxBase()
{
    Create( pParent, vId, rPos, rSize, nStrings, asChoices, lStyle | wxLB_OWNERDRAW, rVal, rsName );
} // end of wxCheckListBox::wxCheckListBox

wxCheckListBox::wxCheckListBox ( wxWindow* pParent,
                                 wxWindowID vId,
                                 const wxPoint& rPos,
                                 const wxSize& rSize,
                                 const wxArrayString& asChoices,
                                 long lStyle,
                                 const wxValidator& rVal,
                                 const wxString& rsName )
               :wxCheckListBoxBase()
{
    wxCArrayString chs(asChoices);
    Create( pParent, vId, rPos, rSize, chs.GetCount(), chs.GetStrings(),
            lStyle | wxLB_OWNERDRAW, rVal, rsName );
} // end of wxCheckListBox::wxCheckListBox

void wxCheckListBox::Delete(unsigned int n)
{
    wxCHECK_RET( IsValid(n),
                 wxT("invalid index in wxCheckListBox::Delete") );
    wxListBox::Delete(n);

    //
    // Free memory
    //
    delete m_aItems[n];
    m_aItems.RemoveAt(n);
} // end of wxCheckListBox::Delete

bool wxCheckListBox::SetFont ( const wxFont& rFont )
{
    for (unsigned int i = 0; i < m_aItems.GetCount(); i++)
        m_aItems[i]->SetFont(rFont);
    wxListBox::SetFont(rFont);
    return true;
} // end of wxCheckListBox::SetFont



//
// Create/retrieve item
// --------------------
//

//
// Create a check list box item
//
wxOwnerDrawn* wxCheckListBox::CreateItem(size_t nIndex)
{
    wxCheckListBoxItem* pItem = new wxCheckListBoxItem( this, nIndex );
    return pItem;
} // end of wxCheckListBox::CreateItem



//
// Return item size
// ----------------
//
long wxCheckListBox::OS2OnMeasure ( WXMEASUREITEMSTRUCT* pItem )
{
    if (!pItem)
        pItem = (WXMEASUREITEMSTRUCT*)new OWNERITEM;
    if (wxListBox::OS2OnMeasure(pItem))
    {
        POWNERITEM pStruct = (POWNERITEM)pItem;

        //
        // Save item height
        //
        m_nItemHeight = pStruct->rclItem.yTop - pStruct->rclItem.yBottom;

        //
        // Add place for the check mark
        //
        pStruct->rclItem.xRight += CHECK_MARK_WIDTH;
        return long(MRFROM2SHORT((USHORT)m_nItemHeight, (USHORT)(pStruct->rclItem.xRight - pStruct->rclItem.xLeft)));
    }
    return 0L;
} // end of wxCheckListBox::CreateItem



//
// Check items
// -----------
//
bool wxCheckListBox::IsChecked(unsigned int uiIndex) const
{
    return GetItem(uiIndex)->IsChecked();
} // end of wxCheckListBox::IsChecked

void wxCheckListBox::Check(unsigned int uiIndex, bool bCheck)
{
    GetItem(uiIndex)->Check(bCheck);
} // end of wxCheckListBox::Check



//
// Process events
// --------------
//
void wxCheckListBox::OnChar ( wxKeyEvent& rEvent )
{
    if (rEvent.GetKeyCode() == WXK_SPACE)
        GetItem(GetSelection())->Toggle();
    else
        rEvent.Skip();
} // end of wxCheckListBox::OnChar

void wxCheckListBox::OnLeftClick ( wxMouseEvent& rEvent )
{
    //
    // Clicking on the item selects it, clicking on the checkmark toggles
    //
    if (rEvent.GetX() <= CHECK_MARK_WIDTH)
    {
        int                         nParentHeight;
        wxScreenDC                  vDc;
        wxCoord                     vHeight;

        GetSize( NULL, &nParentHeight );
        vDc.SetFont(GetFont());
        vHeight = (wxCoord)(vDc.GetCharHeight() * 2.5);

        //
        // This, of course, will not work if the LB is scrolled
        //
        int nY = rEvent.GetY();

        nY = nParentHeight - (nY + vHeight);

        size_t nItem = (size_t)(nY / vHeight);

        if (nItem < m_nNumItems)
            GetItem(nItem)->Toggle();
        //
        // else: it's not an error, just click outside of client zone
        //
    }
    else
    {
        //
        // Implement default behaviour: clicking on the item selects it
        //
        rEvent.Skip();
    }
} // end of wxCheckListBox::OnLeftClick

#endif // wxUSE_CHECKLISTBOX && wxUSE_OWNER_DRAWN