C++ PreCreation函数代码示例

bool wxButton::Create(  wxWindow *parent, wxWindowID id, const wxString &label,
      const wxPoint &pos, const wxSize &size,
      long style, const wxValidator& validator, const wxString &name )
{
    m_needParent = true;
    m_acceptsFocus = true;

    if (!PreCreation( parent, pos, size ) ||
        !CreateBase( parent, id, pos, size, style, validator, name ))
    {
        wxFAIL_MSG( wxT("wxButton creation failed") );
        return false;
    }

    m_widget = gtk_button_new_with_mnemonic("");

    float x_alignment = 0.5;
    if (HasFlag(wxBU_LEFT))
        x_alignment = 0.0;
    else if (HasFlag(wxBU_RIGHT))
        x_alignment = 1.0;

    float y_alignment = 0.5;
    if (HasFlag(wxBU_TOP))
        y_alignment = 0.0;
    else if (HasFlag(wxBU_BOTTOM))
        y_alignment = 1.0;

#ifdef __WXGTK24__
    if (!gtk_check_version(2,4,0))
    {
        gtk_button_set_alignment(GTK_BUTTON(m_widget), x_alignment, y_alignment);
    }
    else
#endif
    {
        if (GTK_IS_MISC(GTK_BIN(m_widget)->child))
            gtk_misc_set_alignment(GTK_MISC(GTK_BIN(m_widget)->child),
                                x_alignment, y_alignment);
    }

    SetLabel(label);

    if (style & wxNO_BORDER)
       gtk_button_set_relief( GTK_BUTTON(m_widget), GTK_RELIEF_NONE );

    g_signal_connect_after (m_widget, "clicked",
                            G_CALLBACK (gtk_button_clicked_callback),
                            this);

    g_signal_connect_after (m_widget, "style_set",
                            G_CALLBACK (gtk_button_style_set_callback),
                            this);

    m_parent->DoAddChild( this );

    PostCreation(size);

    return true;
}

bool wxToggleButton::Create(wxWindow *parent, wxWindowID id,
                            const wxString &label, const wxPoint &pos,
                            const wxSize &size, long style,
                            const wxValidator& validator,
                            const wxString &name)
{
    if (!PreCreation(parent, pos, size) ||
        !CreateBase(parent, id, pos, size, style, validator, name ))
    {
        wxFAIL_MSG(wxT("wxToggleButton creation failed"));
        return false;
    }

    // Create the gtk widget.
    m_widget = gtk_toggle_button_new_with_mnemonic("");
    g_object_ref(m_widget);

    SetLabel(label);

    g_signal_connect (m_widget, "clicked",
                      G_CALLBACK (gtk_togglebutton_clicked_callback),
                      this);

    m_parent->DoAddChild(this);

    PostCreation(size);

    return true;
}

bool wxStaticBitmap::Create( wxWindow *parent, wxWindowID id, const wxBitmap &bitmap,
                             const wxPoint &pos, const wxSize &size,
                             long style, const wxString &name )
{
    m_needParent = TRUE;

    if (!PreCreation( parent, pos, size ) ||
        !CreateBase( parent, id, pos, size, style, wxDefaultValidator, name ))
    {
        wxFAIL_MSG( wxT("wxStaticBitmap creation failed") );
        return false;
    }

    m_bitmap = bitmap;

    wxBitmap bmp(bitmap.Ok() ? bitmap : wxBitmap(bogus_xpm));
    m_widget = gtk_pixmap_new(bmp.GetPixmap(), NULL);

    if (bitmap.Ok())
        SetBitmap(bitmap);

    PostCreation(size);
    m_parent->DoAddChild( this );

    return true;
}

bool wxToggleButton::Create(wxWindow *parent, wxWindowID id,
                            const wxString &label, const wxPoint &pos,
                            const wxSize &size, long style,
                            const wxValidator& validator,
                            const wxString &name)
{
    m_needParent = TRUE;
    m_acceptsFocus = TRUE;

    m_blockEvent = FALSE;

    if (!PreCreation(parent, pos, size) ||
            !CreateBase(parent, id, pos, size, style, validator, name )) {
        wxFAIL_MSG(wxT("wxToggleButton creation failed"));
        return FALSE;
    }

    wxControl::SetLabel(label);

    // Create the gtk widget.
    m_widget = gtk_toggle_button_new_with_label( wxGTK_CONV( m_label ) );

    gtk_signal_connect(GTK_OBJECT(m_widget), "clicked",
                       GTK_SIGNAL_FUNC(gtk_togglebutton_clicked_callback),
                       (gpointer *)this);

    m_parent->DoAddChild(this);

    PostCreation(size);

    return TRUE;
}

bool wxGauge::Create( wxWindow *parent,
                      wxWindowID id,
                      int range,
                      const wxPoint& pos,
                      const wxSize& size,
                      long style,
                      const wxValidator& validator,
                      const wxString& name )
{
    m_needParent = TRUE;

    if (!PreCreation( parent, pos, size ) ||
        !CreateBase( parent, id, pos, size, style, validator, name ))
    {
        wxFAIL_MSG( wxT("wxGauge creation failed") );
        return FALSE;
    }

    m_rangeMax = range;

    m_widget = gtk_progress_bar_new();
    if ( style & wxGA_VERTICAL )
    {
        gtk_progress_bar_set_orientation( GTK_PROGRESS_BAR(m_widget),
                                          GTK_PROGRESS_BOTTOM_TO_TOP );
    }

    m_parent->DoAddChild( this );

    PostCreation(size);
    SetBestSize(size);
    
    return TRUE;
}

bool wxAnimationCtrl::Create( wxWindow *parent, wxWindowID id,
                              const wxAnimation& anim,
                              const wxPoint& pos,
                              const wxSize& size,
                              long style,
                              const wxString& name)
{
    if (!PreCreation( parent, pos, size ) ||
            !base_type::CreateBase(parent, id, pos, size, style & wxWINDOW_STYLE_MASK,
                                   wxDefaultValidator, name))
    {
        wxFAIL_MSG( wxT("wxAnimationCtrl creation failed") );
        return false;
    }

    SetWindowStyle(style);

    m_widget = gtk_image_new();
    g_object_ref(m_widget);

    m_parent->DoAddChild( this );

    PostCreation(size);
    SetInitialSize(size);

    if (anim.IsOk())
        SetAnimation(anim);

    // init the timer used for animation
    m_timer.SetOwner(this);

    return true;
}

bool wxColourButton::Create( wxWindow *parent, wxWindowID id,
                        const wxColour &col,
                        const wxPoint &pos, const wxSize &size,
                        long style, const wxValidator& validator,
                        const wxString &name )
{
    if (!PreCreation( parent, pos, size ) ||
        !wxControl::CreateBase(parent, id, pos, size, style, validator, name))
    {
        wxFAIL_MSG( wxT("wxColourButton creation failed") );
        return false;
    }

    m_colour = col;
#ifdef __WXGTK3__
    m_widget = gtk_color_button_new_with_rgba(m_colour);
#else
    m_widget = gtk_color_button_new_with_color( m_colour.GetColor() );
#endif
    g_object_ref(m_widget);

    // GtkColourButton signals
    g_signal_connect(m_widget, "color-set",
                    G_CALLBACK(gtk_clrbutton_setcolor_callback), this);


    m_parent->DoAddChild( this );

    PostCreation(size);
    SetInitialSize(size);

    return true;
}

bool wxChoice::Create( wxWindow *parent, wxWindowID id,
                       const wxPoint &pos, const wxSize &size,
                       int n, const wxString choices[],
                       long style, const wxValidator& validator,
                       const wxString &name )
{
    if (!PreCreation( parent, pos, size ) ||
            !CreateBase( parent, id, pos, size, style, validator, name ))
    {
        wxFAIL_MSG( wxT("wxChoice creation failed") );
        return false;
    }

    if ( IsSorted() )
    {
        // if our m_strings != NULL, Append() will check for it and insert
        // items in the correct order
        m_strings = new wxSortedArrayString;
    }

    m_widget = gtk_combo_box_new_text();
    g_object_ref(m_widget);

    Append(n, choices);

    m_parent->DoAddChild( this );

    PostCreation(size);

    g_signal_connect_after (m_widget, "changed",
                            G_CALLBACK (gtk_choice_changed_callback), this);

    return true;
}

bool wxMDIClientWindow::CreateClient( wxMDIParentFrame *parent, long style )
{
    m_needParent = true;

    m_insertCallback = (wxInsertChildFunction)wxInsertChildInMDI;

    if (!PreCreation( parent, wxDefaultPosition, wxDefaultSize ) ||
            !CreateBase( parent, wxID_ANY, wxDefaultPosition, wxDefaultSize, style, wxDefaultValidator, wxT("wxMDIClientWindow") ))
    {
        wxFAIL_MSG( wxT("wxMDIClientWindow creation failed") );
        return false;
    }

    m_widget = gtk_notebook_new();

    gtk_signal_connect( GTK_OBJECT(m_widget), "switch_page",
                        GTK_SIGNAL_FUNC(gtk_mdi_page_change_callback), (gpointer)parent );

    gtk_notebook_set_scrollable( GTK_NOTEBOOK(m_widget), 1 );

    m_parent->DoAddChild( this );

    PostCreation();

    Show( true );

    return true;
}

// Scrollbar
bool wxScrollBar::Create(wxWindow *parent, wxWindowID id,
           const wxPoint& pos,
           const wxSize& size, long style,
           const wxValidator& validator,
           const wxString& name)
{
    if( !CreateControl( parent, id, pos, size, style, validator, name ) )
        return false;
    PreCreation();

    wxSize newSize =
        ( style & wxHORIZONTAL ) ? wxSize( 140, 16 ) : wxSize( 16, 140 );
    if( size.x != -1 ) newSize.x = size.x;
    if( size.y != -1 ) newSize.y = size.y;

    Widget parentWidget = (Widget) parent->GetClientWidget();

    m_mainWidget =
        DoCreateScrollBar( (WXWidget)parentWidget,
                           (wxOrientation)(style & (wxHORIZONTAL|wxVERTICAL)),
                           (void (*)())wxScrollBarCallback );

    PostCreation();
    AttachWidget (parent, m_mainWidget, (WXWidget) NULL,
                  pos.x, pos.y, newSize.x, newSize.y);

    return true;
}

bool wxMDIClientWindow::CreateClient(wxMDIParentFrame *parent, long style)
{
    if ( !PreCreation( parent, wxDefaultPosition, wxDefaultSize ) ||
         !CreateBase( parent, wxID_ANY, wxDefaultPosition, wxDefaultSize,
                       style, wxDefaultValidator, "wxMDIClientWindow" ))
    {
        wxFAIL_MSG( "wxMDIClientWindow creation failed" );
        return false;
    }

    m_widget = gtk_notebook_new();
    g_object_ref(m_widget);

    g_signal_connect (m_widget, "switch_page",
                      G_CALLBACK (gtk_mdi_page_change_callback), parent);

    gtk_notebook_set_scrollable( GTK_NOTEBOOK(m_widget), 1 );

    m_parent->DoAddChild( this );

    PostCreation();

    Show( true );

    return true;
}

bool wxDirDialog::Create(wxWindow* parent,
                         const wxString& title,
                         const wxString& defaultPath,
                         long style,
                         const wxPoint& pos,
                         const wxSize& WXUNUSED(sz),
                         const wxString& WXUNUSED(name))
{
    m_message = title;

    parent = GetParentForModalDialog(parent, style);

    if (!PreCreation(parent, pos, wxDefaultSize) ||
        !CreateBase(parent, wxID_ANY, pos, wxDefaultSize, style,
                wxDefaultValidator, wxT("dirdialog")))
    {
        wxFAIL_MSG( wxT("wxDirDialog creation failed") );
        return false;
    }

    GtkWindow* gtk_parent = NULL;
    if (parent)
        gtk_parent = GTK_WINDOW( gtk_widget_get_toplevel(parent->m_widget) );

    m_widget = gtk_file_chooser_dialog_new(
                   wxGTK_CONV(m_message),
                   gtk_parent,
                   GTK_FILE_CHOOSER_ACTION_SELECT_FOLDER,
                   GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
                   GTK_STOCK_OPEN, GTK_RESPONSE_ACCEPT,
                   NULL);
    g_object_ref(m_widget);

    gtk_dialog_set_default_response(GTK_DIALOG(m_widget), GTK_RESPONSE_ACCEPT);
#if GTK_CHECK_VERSION(2,18,0)
#ifndef __WXGTK3__
    if (gtk_check_version(2,18,0) == NULL)
#endif
    {
        gtk_file_chooser_set_create_folders(
            GTK_FILE_CHOOSER(m_widget), (style & wxDD_DIR_MUST_EXIST) == 0);
    }
#endif

    // local-only property could be set to false to allow non-local files to be loaded.
    // In that case get/set_uri(s) should be used instead of get/set_filename(s) everywhere
    // and the GtkFileChooserDialog should probably also be created with a backend,
    // e.g. "gnome-vfs", "default", ... (gtk_file_chooser_dialog_new_with_backend).
    // Currently local-only is kept as the default - true:
    // gtk_file_chooser_set_local_only(GTK_FILE_CHOOSER(m_widget), true);

    g_signal_connect (m_widget, "response",
        G_CALLBACK (gtk_dirdialog_response_callback), this);

    if ( !defaultPath.empty() )
        SetPath(defaultPath);

    return true;
}

bool wxFontDialog::DoCreate(wxWindow *parent)
{
    m_needParent = false;

    if (!PreCreation( parent, wxDefaultPosition, wxDefaultSize ) ||
        !CreateBase( parent, -1, wxDefaultPosition, wxDefaultSize, wxDEFAULT_DIALOG_STYLE,
                     wxDefaultValidator, wxT("fontdialog") ))
    {
        wxFAIL_MSG( wxT("wxFontDialog creation failed") );
        return false;
    }

    wxString m_message( _("Choose font") );
    m_widget = gtk_font_selection_dialog_new( wxGTK_CONV( m_message ) );

    if (parent)
        gtk_window_set_transient_for(GTK_WINDOW(m_widget),
                                     GTK_WINDOW(parent->m_widget));

    GtkFontSelectionDialog *sel = GTK_FONT_SELECTION_DIALOG(m_widget);

    gtk_signal_connect( GTK_OBJECT(sel->ok_button), "clicked",
      GTK_SIGNAL_FUNC(gtk_fontdialog_ok_callback), (gpointer*)this );

    // strange way to internationalize
    gtk_label_set( GTK_LABEL( BUTTON_CHILD(sel->ok_button) ), _("OK") );

    gtk_signal_connect( GTK_OBJECT(sel->cancel_button), "clicked",
      GTK_SIGNAL_FUNC(gtk_fontdialog_cancel_callback), (gpointer*)this );

    // strange way to internationalize
    gtk_label_set( GTK_LABEL( BUTTON_CHILD(sel->cancel_button) ), _("Cancel") );

    gtk_signal_connect( GTK_OBJECT(m_widget), "delete_event",
        GTK_SIGNAL_FUNC(gtk_fontdialog_delete_callback), (gpointer)this );

    wxFont font = m_fontData.GetInitialFont();
    if( font.IsOk() )
    {
        const wxNativeFontInfo *info = font.GetNativeFontInfo();

        if ( info )
        {

            const wxString& fontname = info->GetXFontName();
            if ( !fontname )
                font.GetInternalFont();

            gtk_font_selection_dialog_set_font_name(sel, wxGTK_CONV(fontname));
        }
        else
        {
            // this is not supposed to happen!
            wxFAIL_MSG(wxT("font is ok but no native font info?"));
        }
    }

    return true;
}

bool wxCheckBox::Create(wxWindow *parent,
                        wxWindowID id,
                        const wxString &label,
                        const wxPoint &pos,
                        const wxSize &size,
                        long style,
                        const wxValidator& validator,
                        const wxString &name )
{
    m_needParent = true;
    m_acceptsFocus = true;
    m_blockEvent = false;

    if (!PreCreation( parent, pos, size ) ||
        !CreateBase( parent, id, pos, size, style, validator, name ))
    {
        wxFAIL_MSG( wxT("wxCheckBox creation failed") );
        return false;
    }

    wxASSERT_MSG( (style & wxCHK_ALLOW_3RD_STATE_FOR_USER) == 0 ||
                  (style & wxCHK_3STATE) != 0,
                  wxT("Using wxCHK_ALLOW_3RD_STATE_FOR_USER")
                  wxT(" style flag for a 2-state checkbox is useless") );

    if ( style & wxALIGN_RIGHT )
    {
        // VZ: as I don't know a way to create a right aligned checkbox with
        //     GTK we will create a checkbox without label and a label at the
        //     left of it
        m_widgetCheckbox = gtk_check_button_new();

        m_widgetLabel = gtk_label_new("");
        gtk_misc_set_alignment(GTK_MISC(m_widgetLabel), 0.0, 0.5);

        m_widget = gtk_hbox_new(FALSE, 0);
        gtk_box_pack_start(GTK_BOX(m_widget), m_widgetLabel, FALSE, FALSE, 3);
        gtk_box_pack_start(GTK_BOX(m_widget), m_widgetCheckbox, FALSE, FALSE, 3);

        gtk_widget_show( m_widgetLabel );
        gtk_widget_show( m_widgetCheckbox );
    }
    else
    {
        m_widgetCheckbox = gtk_check_button_new_with_label("");
        m_widgetLabel = GTK_BIN(m_widgetCheckbox)->child;
        m_widget = m_widgetCheckbox;
    }
    SetLabel( label );

    g_signal_connect (m_widgetCheckbox, "toggled",
                      G_CALLBACK (gtk_checkbox_toggled_callback), this);

    m_parent->DoAddChild( this );

    PostCreation(size);

    return true;
}

bool wxBitmapButton::Create(wxWindow *parent, wxWindowID id,
                            const wxBitmap& bitmap,
                            const wxPoint& pos,
                            const wxSize& size, long style,
                            const wxValidator& validator,
                            const wxString& name)
{
    if( !CreateControl( parent, id, pos, size, style, validator, name ) )
        return false;
    PreCreation();

    m_bitmaps[State_Normal] =
    m_bitmapsOriginal[State_Normal] = bitmap;
    m_bitmaps[State_Pressed] =
    m_bitmapsOriginal[State_Pressed] = bitmap;

    Widget parentWidget = (Widget) parent->GetClientWidget();

    /*
    * Patch Note (important)
    * There is no major reason to put a defaultButtonThickness here.
    * Not requesting it give the ability to put wxButton with a spacing
    * as small as requested. However, if some button become a DefaultButton,
    * other buttons are no more aligned -- This is why we set
    * defaultButtonThickness of ALL buttons belonging to the same wxPanel,
    * in the ::SetDefaultButton method.
    */
    Widget buttonWidget = XtVaCreateManagedWidget ("button",

        // Gadget causes problems for default button operation.
#if wxUSE_GADGETS
        xmPushButtonGadgetClass, parentWidget,
#else
        xmPushButtonWidgetClass, parentWidget,
#endif
        // See comment for wxButton::SetDefault
        // XmNdefaultButtonShadowThickness, 1,
        XmNrecomputeSize, False,
        NULL);

    m_mainWidget = (WXWidget) buttonWidget;

    XtAddCallback (buttonWidget,
                   XmNactivateCallback, (XtCallbackProc) wxButtonCallback,
                   (XtPointer) this);

    wxSize best = GetBitmapLabel().IsOk() ? GetBestSize() : wxSize(30, 30);
    if( size.x != -1 ) best.x = size.x;
    if( size.y != -1 ) best.y = size.y;

    PostCreation();
    OnSetBitmap();

    AttachWidget (parent, m_mainWidget, (WXWidget) NULL,
                  pos.x, pos.y, best.x, best.y);

    return true;
}