fix memory leak; allocate the DC before SetFont() is called on the status bar

[wxWidgets.git] / include / wx / msw / combobox.h

/////////////////////////////////////////////////////////////////////////////
// Name:        wx/msw/combobox.h
// Purpose:     wxComboBox class
// Author:      Julian Smart
// Modified by:
// Created:     01/02/97
// RCS-ID:      $Id$
// Copyright:   (c) Julian Smart
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#ifndef _WX_COMBOBOX_H_
#define _WX_COMBOBOX_H_

#include "wx/choice.h"
#include "wx/textentry.h"

#if wxUSE_COMBOBOX

// ----------------------------------------------------------------------------
// Combobox control
// ----------------------------------------------------------------------------

class WXDLLIMPEXP_CORE wxComboBox : public wxChoice,
                                    public wxTextEntry
{
public:
    wxComboBox() { Init(); }

    wxComboBox(wxWindow *parent, wxWindowID id,
            const wxString& value = wxEmptyString,
            const wxPoint& pos = wxDefaultPosition,
            const wxSize& size = wxDefaultSize,
            int n = 0, const wxString choices[] = NULL,
            long style = 0,
            const wxValidator& validator = wxDefaultValidator,
            const wxString& name = wxComboBoxNameStr)
    {
        Init();
        Create(parent, id, value, pos, size, n, choices, style, validator, name);

    }

    wxComboBox(wxWindow *parent, wxWindowID id,
            const wxString& value,
            const wxPoint& pos,
            const wxSize& size,
            const wxArrayString& choices,
            long style = 0,
            const wxValidator& validator = wxDefaultValidator,
            const wxString& name = wxComboBoxNameStr)
    {
        Init();

        Create(parent, id, value, pos, size, choices, style, validator, name);
    }

    bool Create(wxWindow *parent,
                wxWindowID id,
                const wxString& value = wxEmptyString,
                const wxPoint& pos = wxDefaultPosition,
                const wxSize& size = wxDefaultSize,
                int n = 0,
                const wxString choices[] = NULL,
                long style = 0,
                const wxValidator& validator = wxDefaultValidator,
                const wxString& name = wxComboBoxNameStr);
    bool Create(wxWindow *parent,
                wxWindowID id,
                const wxString& value,
                const wxPoint& pos,
                const wxSize& size,
                const wxArrayString& choices,
                long style = 0,
                const wxValidator& validator = wxDefaultValidator,
                const wxString& name = wxComboBoxNameStr);

    // resolve ambiguities among virtual functions inherited from both base
    // classes
    virtual void Clear();
    virtual wxString GetValue() const;
    virtual void SetValue(const wxString& value);
    virtual wxString GetStringSelection() const
        { return wxChoice::GetStringSelection(); }

    virtual void SetSelection(int n) { wxChoice::SetSelection(n); }
    virtual void SetSelection(long from, long to)
        { wxTextEntry::SetSelection(from, to); }
    virtual int GetSelection() const { return wxChoice::GetSelection(); }
    virtual void GetSelection(long *from, long *to) const;

    virtual bool IsEditable() const;

    // implementation only from now on
    virtual bool MSWCommand(WXUINT param, WXWORD id);
    bool MSWProcessEditMsg(WXUINT msg, WXWPARAM wParam, WXLPARAM lParam);
    virtual WXLRESULT MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam);
    bool MSWShouldPreProcessMessage(WXMSG *pMsg);

    // Standard event handling
    void OnCut(wxCommandEvent& event);
    void OnCopy(wxCommandEvent& event);
    void OnPaste(wxCommandEvent& event);
    void OnUndo(wxCommandEvent& event);
    void OnRedo(wxCommandEvent& event);
    void OnDelete(wxCommandEvent& event);
    void OnSelectAll(wxCommandEvent& event);

    void OnUpdateCut(wxUpdateUIEvent& event);
    void OnUpdateCopy(wxUpdateUIEvent& event);
    void OnUpdatePaste(wxUpdateUIEvent& event);
    void OnUpdateUndo(wxUpdateUIEvent& event);
    void OnUpdateRedo(wxUpdateUIEvent& event);
    void OnUpdateDelete(wxUpdateUIEvent& event);
    void OnUpdateSelectAll(wxUpdateUIEvent& event);

    virtual WXDWORD MSWGetStyle(long style, WXDWORD *exstyle) const;

protected:
#if wxUSE_TOOLTIPS
    virtual void DoSetToolTip(wxToolTip *tip);
#endif

    // this is the implementation of GetEditHWND() which can also be used when
    // we don't have the edit control, it simply returns NULL then
    //
    // try not to use this function unless absolutely necessary (as in the
    // message handling code where the edit control might not be created yet
    // for the messages we receive during the control creation) as normally
    // just testing for IsEditable() and using GetEditHWND() should be enough
    WXHWND GetEditHWNDIfAvailable() const;

    virtual void EnableTextChangedEvents(bool enable)
    {
        m_allowTextEvents = enable;
    }

private:
    // this is the overridden wxTextEntry method which should only be called
    // when we do have an edit control so it asserts if this is not the case
    virtual WXHWND GetEditHWND() const;

    // common part of all ctors
    void Init()
    {
        m_allowTextEvents = true;
    }

    // normally true, false if text events are currently disabled
    bool m_allowTextEvents;

    DECLARE_DYNAMIC_CLASS_NO_COPY(wxComboBox)
    DECLARE_EVENT_TABLE()
};

#endif // wxUSE_COMBOBOX

#endif // _WX_COMBOBOX_H_