combobox.cpp

很牛的GUI源码wxWidgets-2.8.0.zip 可在多种平台下运行.

/////////////////////////////////////////////////////////////////////////////
// Name:        src/mac/carbon/combobox.cpp
// Purpose:     wxComboBox class
// Author:      Stefan Csomor, Dan "Bud" Keith (composite combobox)
// Modified by:
// Created:     1998-01-01
// RCS-ID:      $Id: combobox.cpp,v 1.79 2006/11/10 20:37:41 SC Exp $
// Copyright:   (c) Stefan Csomor
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#include "wx/wxprec.h"

#if wxUSE_COMBOBOX

#include "wx/combobox.h"

#ifndef WX_PRECOMP
    #include "wx/button.h"
    #include "wx/menu.h"
    #include "wx/containr.h"
    #include "wx/toplevel.h"
#endif

#include "wx/mac/uma.h"

IMPLEMENT_DYNAMIC_CLASS(wxComboBox, wxControl)

WX_DELEGATE_TO_CONTROL_CONTAINER(wxComboBox, wxControl)

BEGIN_EVENT_TABLE(wxComboBox, wxControl)
    WX_EVENT_TABLE_CONTROL_CONTAINER(wxComboBox)
END_EVENT_TABLE()


static int nextPopUpMenuId = 1000 ;

MenuHandle NewUniqueMenu()
{
    MenuHandle handle = UMANewMenu(nextPopUpMenuId, wxString(wxT("Menu")), wxFont::GetDefaultEncoding() );
    nextPopUpMenuId++ ;

    return handle ;
}


// ----------------------------------------------------------------------------
// constants
// ----------------------------------------------------------------------------

// the margin between the text control and the choice
#if TARGET_API_MAC_OSX
// margin should be bigger on OS X due to blue highlight
// around text control.
static const wxCoord MARGIN = 4;
// this is the border a focus rect on OSX is needing
static const int    TEXTFOCUSBORDER = 3 ;
#else
static const wxCoord MARGIN = 2;
static const int    TEXTFOCUSBORDER = 0 ;
#endif


// ----------------------------------------------------------------------------
// wxComboBoxText: text control forwards events to combobox
// ----------------------------------------------------------------------------

class wxComboBoxText : public wxTextCtrl
{
public:
    wxComboBoxText( wxComboBox * cb )
        : wxTextCtrl( cb , 1 )
    {
        m_cb = cb;
        SetTriggerOnSetValue( false );
    }

protected:
    void OnChar( wxKeyEvent& event )
    {
        // Allows processing the tab key to go to the next control
        if (event.GetKeyCode() == WXK_TAB)
        {
            wxNavigationKeyEvent NavEvent;
            NavEvent.SetEventObject(this);
            NavEvent.SetDirection(true);
            NavEvent.SetWindowChange(false);

            // Get the parent of the combo and have it process the navigation?
            if (m_cb->GetParent()->GetEventHandler()->ProcessEvent(NavEvent))
                    return;
        }

        // send the event to the combobox class in case the user has bound EVT_CHAR
        wxKeyEvent kevt(event);
        kevt.SetEventObject(m_cb);
        if (m_cb->GetEventHandler()->ProcessEvent(kevt))
            // If the event was handled and not skipped then we're done
            return;

        if ( event.GetKeyCode() == WXK_RETURN )
        {
            wxCommandEvent event(wxEVT_COMMAND_TEXT_ENTER, m_cb->GetId());
            event.SetString( GetValue() );
            event.SetInt( m_cb->GetSelection() );
            event.SetEventObject( m_cb );

            // This will invoke the dialog default action,
            // such as the clicking the default button.
            if (!m_cb->GetEventHandler()->ProcessEvent( event ))
            {
                wxTopLevelWindow *tlw = wxDynamicCast(wxGetTopLevelParent(this), wxTopLevelWindow);
                if ( tlw && tlw->GetDefaultItem() )
                {
                    wxButton *def = wxDynamicCast(tlw->GetDefaultItem(), wxButton);
                    if ( def && def->IsEnabled() )
                    {
                        wxCommandEvent event( wxEVT_COMMAND_BUTTON_CLICKED, def->GetId() );
                        event.SetEventObject(def);
                        def->Command(event);
                    }
                }

                return;
            }
        }

        event.Skip();
    }

    void OnKeyUp( wxKeyEvent& event )
    {
        event.SetEventObject(m_cb);
        event.SetId(m_cb->GetId());
        if (! m_cb->GetEventHandler()->ProcessEvent(event))
            event.Skip();
    }

    void OnKeyDown( wxKeyEvent& event )
    {
        event.SetEventObject(m_cb);
        event.SetId(m_cb->GetId());
        if (! m_cb->GetEventHandler()->ProcessEvent(event))
            event.Skip();
    }

    void OnText( wxCommandEvent& event )
    {
        event.SetEventObject(m_cb);
        event.SetId(m_cb->GetId());
        if (! m_cb->GetEventHandler()->ProcessEvent(event))
            event.Skip();
    }

private:
    wxComboBox *m_cb;

    DECLARE_EVENT_TABLE()
};

BEGIN_EVENT_TABLE(wxComboBoxText, wxTextCtrl)
    EVT_KEY_DOWN(wxComboBoxText::OnKeyDown)
    EVT_CHAR(wxComboBoxText::OnChar)
    EVT_KEY_UP(wxComboBoxText::OnKeyUp)
    EVT_TEXT(wxID_ANY, wxComboBoxText::OnText)
END_EVENT_TABLE()

class wxComboBoxChoice : public wxChoice
{
public:
    wxComboBoxChoice( wxComboBox *cb, int style )
        : wxChoice( cb , 1 , wxDefaultPosition , wxDefaultSize , 0 , NULL , style & (wxCB_SORT) )
    {
        m_cb = cb;
    }

    int GetPopupWidth() const
    {
        switch ( GetWindowVariant() )
        {
            case wxWINDOW_VARIANT_NORMAL :
            case wxWINDOW_VARIANT_LARGE :
                return 24 ;

            default :
                return 21 ;
        }
    }

protected:
    void OnChoice( wxCommandEvent& e )
    {
        wxString    s = e.GetString();

        m_cb->DelegateChoice( s );
        wxCommandEvent event2(wxEVT_COMMAND_COMBOBOX_SELECTED, m_cb->GetId() );
        event2.SetInt(m_cb->GetSelection());
        event2.SetEventObject(m_cb);
        event2.SetString(m_cb->GetStringSelection());
        m_cb->ProcessCommand(event2);

        // For consistency with MSW and GTK, also send a text updated event
        // After all, the text is updated when a selection is made
        wxCommandEvent TextEvent( wxEVT_COMMAND_TEXT_UPDATED, m_cb->GetId() );
        TextEvent.SetString( m_cb->GetStringSelection() );
        TextEvent.SetEventObject( m_cb );
        m_cb->ProcessCommand( TextEvent );
    }

    virtual wxSize DoGetBestSize() const
    {
        wxSize sz = wxChoice::DoGetBestSize() ;
        if (! m_cb->HasFlag(wxCB_READONLY) )
            sz.x = GetPopupWidth() ;

        return sz ;
    }

private:
    wxComboBox *m_cb;

    friend class wxComboBox;

    DECLARE_EVENT_TABLE()
};

BEGIN_EVENT_TABLE(wxComboBoxChoice, wxChoice)
    EVT_CHOICE(wxID_ANY, wxComboBoxChoice::OnChoice)
END_EVENT_TABLE()

wxComboBox::~wxComboBox()
{
    // delete client objects
    FreeData();

    // delete the controls now, don't leave them alive even though they would
    // still be eventually deleted by our parent - but it will be too late, the
    // user code expects them to be gone now
    if (m_text != NULL)
    {
        delete m_text;
        m_text = NULL;
    }

    if (m_choice != NULL)
    {
        delete m_choice;
        m_choice = NULL;
    }
}

// ----------------------------------------------------------------------------
// geometry
// ----------------------------------------------------------------------------

wxSize wxComboBox::DoGetBestSize() const
{
    if (!m_choice && !m_text)
        return GetSize();

    wxSize size = m_choice->GetBestSize();

    if ( m_text != NULL )
    {
        wxSize  sizeText = m_text->GetBestSize();
        if (sizeText.y > size.y)
            size.y = sizeText.y;

        size.x = m_choice->GetPopupWidth() + sizeText.x + MARGIN;
        size.x += TEXTFOCUSBORDER ;
        size.y += 2 * TEXTFOCUSBORDER ;
    }
    else
    {
        // clipping is too tight
        size.y += 1 ;
    }

    return size;
}

void wxComboBox::DoMoveWindow(int x, int y, int width, int height)
{
    wxControl::DoMoveWindow( x, y, width , height );

    if ( m_text == NULL )
    {
        // we might not be fully constructed yet, therefore watch out...
        if ( m_choice )
            m_choice->SetSize(0, 0 , width, -1);
    }
    else
    {
        wxCoord wText = width - m_choice->GetPopupWidth() - MARGIN;
        m_text->SetSize(TEXTFOCUSBORDER, TEXTFOCUSBORDER, wText, -1);

        // put it at an inset of 1 to have outer area shadows drawn as well
        m_choice->SetSize(TEXTFOCUSBORDER + wText + MARGIN - 1 , TEXTFOCUSBORDER, m_choice->GetPopupWidth() , -1);
    }
}

// ----------------------------------------------------------------------------
// operations forwarded to the subcontrols
// ----------------------------------------------------------------------------

bool wxComboBox::Enable(bool enable)
{
    if ( !wxControl::Enable(enable) )
        return false;

    if (m_text)
        m_text->Enable(enable);

    return true;
}

bool wxComboBox::Show(bool show)
{
    if ( !wxControl::Show(show) )
        return false;

    return true;
}

void wxComboBox::DelegateTextChanged( const wxString& value )
{
    SetStringSelection( value );
}

void wxComboBox::DelegateChoice( const wxString& value )
{
    SetStringSelection( value );
}

void wxComboBox::Init()
{
    m_container.SetContainerWindow(this);
}

bool wxComboBox::Create(wxWindow *parent,
    wxWindowID id,
    const wxString& value,