fix warnings about unreachable return statements

[wxWidgets.git] / src / gtk / artgtk.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        src/gtk/artgtk.cpp
// Purpose:     stock wxArtProvider instance with native GTK+ stock icons
// Author:      Vaclav Slavik
// Modified by:
// Created:     2004-08-22
// RCS-ID:      $Id$
// Copyright:   (c) Vaclav Slavik, 2004
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

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

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

#if defined(__BORLANDC__)
    #pragma hdrstop
#endif

#include "wx/artprov.h"
#include "wx/gtk/private.h"

// compatibility with older GTK+ versions:
#ifndef GTK_STOCK_FILE
    #define GTK_STOCK_FILE "gtk-file"
#endif
#ifndef GTK_STOCK_DIRECTORY
    #define GTK_STOCK_DIRECTORY "gtk-directory"
#endif


// ----------------------------------------------------------------------------
// wxGTK2ArtProvider
// ----------------------------------------------------------------------------

class wxGTK2ArtProvider : public wxArtProvider
{
protected:
    virtual wxBitmap CreateBitmap(const wxArtID& id, const wxArtClient& client,
                                  const wxSize& size);
    virtual wxIconBundle CreateIconBundle(const wxArtID& id,
                                          const wxArtClient& client);
};

/*static*/ void wxArtProvider::InitNativeProvider()
{
    PushBack(new wxGTK2ArtProvider);
}

// ----------------------------------------------------------------------------
// CreateBitmap routine
// ----------------------------------------------------------------------------

namespace
{

wxString wxArtIDToStock(const wxArtID& id)
{
    #define ART(wxid, gtkid) \
           if (id == wxid) return gtkid;

    ART(wxART_ERROR,                               GTK_STOCK_DIALOG_ERROR)
    ART(wxART_INFORMATION,                         GTK_STOCK_DIALOG_INFO)
    ART(wxART_WARNING,                             GTK_STOCK_DIALOG_WARNING)
    ART(wxART_QUESTION,                            GTK_STOCK_DIALOG_QUESTION)

    //ART(wxART_HELP_SIDE_PANEL,                     )
    ART(wxART_HELP_SETTINGS,                       GTK_STOCK_SELECT_FONT)
    //ART(wxART_HELP_BOOK,                           )
    ART(wxART_HELP_FOLDER,                         GTK_STOCK_DIRECTORY)
    ART(wxART_HELP_PAGE,                           GTK_STOCK_FILE)
    ART(wxART_MISSING_IMAGE,                       GTK_STOCK_MISSING_IMAGE)
    ART(wxART_ADD_BOOKMARK,                        GTK_STOCK_ADD)
    ART(wxART_DEL_BOOKMARK,                        GTK_STOCK_REMOVE)
    ART(wxART_GO_BACK,                             GTK_STOCK_GO_BACK)
    ART(wxART_GO_FORWARD,                          GTK_STOCK_GO_FORWARD)
    ART(wxART_GO_UP,                               GTK_STOCK_GO_UP)
    ART(wxART_GO_DOWN,                             GTK_STOCK_GO_DOWN)
    ART(wxART_GO_TO_PARENT,                        GTK_STOCK_GO_UP)
    ART(wxART_GO_HOME,                             GTK_STOCK_HOME)
    ART(wxART_GOTO_FIRST,                          GTK_STOCK_GOTO_FIRST)
    ART(wxART_GOTO_LAST,                           GTK_STOCK_GOTO_LAST)
    ART(wxART_FILE_OPEN,                           GTK_STOCK_OPEN)
    ART(wxART_PRINT,                               GTK_STOCK_PRINT)
    ART(wxART_HELP,                                GTK_STOCK_HELP)
    ART(wxART_TIP,                                 GTK_STOCK_DIALOG_INFO)
    //ART(wxART_REPORT_VIEW,                         )
    //ART(wxART_LIST_VIEW,                           )
    //ART(wxART_NEW_DIR,                             )
    ART(wxART_FOLDER,                              GTK_STOCK_DIRECTORY)
    ART(wxART_FOLDER_OPEN,                         GTK_STOCK_DIRECTORY)
    //ART(wxART_GO_DIR_UP,                           )
    ART(wxART_EXECUTABLE_FILE,                     GTK_STOCK_EXECUTE)
    ART(wxART_NORMAL_FILE,                         GTK_STOCK_FILE)
    ART(wxART_TICK_MARK,                           GTK_STOCK_APPLY)
    ART(wxART_CROSS_MARK,                          GTK_STOCK_CANCEL)

    ART(wxART_FLOPPY,                              GTK_STOCK_FLOPPY)
    ART(wxART_CDROM,                               GTK_STOCK_CDROM)
    ART(wxART_HARDDISK,                            GTK_STOCK_HARDDISK)
    ART(wxART_REMOVABLE,                           GTK_STOCK_HARDDISK)

    ART(wxART_FILE_SAVE,                           GTK_STOCK_SAVE)
    ART(wxART_FILE_SAVE_AS,                        GTK_STOCK_SAVE_AS)

    ART(wxART_COPY,                                GTK_STOCK_COPY)
    ART(wxART_CUT,                                 GTK_STOCK_CUT)
    ART(wxART_PASTE,                               GTK_STOCK_PASTE)
    ART(wxART_DELETE,                              GTK_STOCK_DELETE)
    ART(wxART_NEW,                                 GTK_STOCK_NEW)

    ART(wxART_UNDO,                                GTK_STOCK_UNDO)
    ART(wxART_REDO,                                GTK_STOCK_REDO)

    ART(wxART_PLUS,                                GTK_STOCK_ADD)
    ART(wxART_MINUS,                               GTK_STOCK_REMOVE)

    ART(wxART_CLOSE,                               GTK_STOCK_CLOSE)
    ART(wxART_QUIT,                                GTK_STOCK_QUIT)

    ART(wxART_FIND,                                GTK_STOCK_FIND)
    ART(wxART_FIND_AND_REPLACE,                    GTK_STOCK_FIND_AND_REPLACE)

    #undef ART

    // allow passing GTK+ stock IDs to wxArtProvider -- if a recognized wx
    // ID wasn't found, pass it to GTK+ in the hope it is a GTK+ or theme
    // icon name:
    return id;
}

GtkIconSize ArtClientToIconSize(const wxArtClient& client)
{
    if (client == wxART_TOOLBAR)
        return GTK_ICON_SIZE_LARGE_TOOLBAR;
    else if (client == wxART_MENU || client == wxART_FRAME_ICON)
        return GTK_ICON_SIZE_MENU;
    else if (client == wxART_CMN_DIALOG || client == wxART_MESSAGE_BOX)
        return GTK_ICON_SIZE_DIALOG;
    else if (client == wxART_BUTTON)
        return GTK_ICON_SIZE_BUTTON;
    else
        return GTK_ICON_SIZE_INVALID; // this is arbitrary
}

GtkIconSize FindClosestIconSize(const wxSize& size)
{
    #define NUM_SIZES 6
    static struct
    {
        GtkIconSize icon;
        gint x, y;
    } s_sizes[NUM_SIZES];
    static bool s_sizesInitialized = false;

    if (!s_sizesInitialized)
    {
        s_sizes[0].icon = GTK_ICON_SIZE_MENU;
        s_sizes[1].icon = GTK_ICON_SIZE_SMALL_TOOLBAR;
        s_sizes[2].icon = GTK_ICON_SIZE_LARGE_TOOLBAR;
        s_sizes[3].icon = GTK_ICON_SIZE_BUTTON;
        s_sizes[4].icon = GTK_ICON_SIZE_DND;
        s_sizes[5].icon = GTK_ICON_SIZE_DIALOG;
        for (size_t i = 0; i < NUM_SIZES; i++)
        {
            gtk_icon_size_lookup(s_sizes[i].icon,
                                 &s_sizes[i].x, &s_sizes[i].y);
        }
        s_sizesInitialized = true;
    }

    GtkIconSize best = GTK_ICON_SIZE_DIALOG; // presumably largest
    unsigned distance = INT_MAX;
    for (size_t i = 0; i < NUM_SIZES; i++)
    {
        // only use larger bitmaps, scaling down looks better than scaling up:
        if (size.x > s_sizes[i].x || size.y > s_sizes[i].y)
            continue;

        unsigned dist = (size.x - s_sizes[i].x) * (size.x - s_sizes[i].x) +
                        (size.y - s_sizes[i].y) * (size.y - s_sizes[i].y);
        if (dist == 0)
            return s_sizes[i].icon;
        else if (dist < distance)
        {
            distance = dist;
            best = s_sizes[i].icon;
        }
    }
    return best;
}

GdkPixbuf *CreateStockIcon(const char *stockid, GtkIconSize size)
{
    // FIXME: This code is not 100% correct, because stock pixmap are
    //        context-dependent and may be affected by theme engine, the
    //        correct value can only be obtained for given GtkWidget object.
    //
    //        Fool-proof implementation of stock bitmaps would extend wxBitmap
    //        with "stock-id" representation (in addition to pixmap and pixbuf
    //        ones) and would convert it to pixbuf when rendered.

    GtkStyle* style = gtk_widget_get_style(wxGTKPrivate::GetButtonWidget());
    GtkIconSet* iconset = gtk_style_lookup_icon_set(style, stockid);

    if (!iconset)
        return NULL;

    return gtk_icon_set_render_icon(iconset, style,
                                    gtk_widget_get_default_direction(),
                                    GTK_STATE_NORMAL, size, NULL, NULL);
}

GdkPixbuf *CreateThemeIcon(const char *iconname, int size)
{
    return gtk_icon_theme_load_icon
           (
               gtk_icon_theme_get_default(),
               iconname,
               size,
               (GtkIconLookupFlags)0,
               NULL
           );
}


// creates either stock or theme icon
GdkPixbuf *CreateGtkIcon(const char *icon_name,
                         GtkIconSize stock_size, const wxSize& pixel_size)
{
    // try stock GTK+ icon first
    GdkPixbuf *pixbuf = CreateStockIcon(icon_name, stock_size);
    if ( pixbuf )
        return pixbuf;

    // if that fails, try theme icon
    wxSize size(pixel_size);
    if ( pixel_size == wxDefaultSize )
        gtk_icon_size_lookup(stock_size, &size.x, &size.y);
    return CreateThemeIcon(icon_name, size.x);
}

template<typename SizeType, typename LoaderFunc>
wxIconBundle DoCreateIconBundle(const char *stockid,
                                const SizeType *sizes_from,
                                const SizeType *sizes_to,
                                LoaderFunc get_icon)

{
    wxIconBundle bundle;

    for ( const SizeType *i = sizes_from; i != sizes_to; ++i )
    {
        GdkPixbuf *pixbuf = get_icon(stockid, *i);
        if ( !pixbuf )
            continue;

        wxIcon icon;
        icon.CopyFromBitmap(wxBitmap(pixbuf));
        bundle.AddIcon(icon);
    }

    return bundle;
}

} // anonymous namespace

wxBitmap wxGTK2ArtProvider::CreateBitmap(const wxArtID& id,
                                         const wxArtClient& client,
                                         const wxSize& size)
{
    const wxString stockid = wxArtIDToStock(id);

    GtkIconSize stocksize = (size == wxDefaultSize) ?
                                ArtClientToIconSize(client) :
                                FindClosestIconSize(size);
    // we must have some size, this is arbitrary
    if (stocksize == GTK_ICON_SIZE_INVALID)
        stocksize = GTK_ICON_SIZE_BUTTON;

    GdkPixbuf *pixbuf = CreateGtkIcon(stockid.utf8_str(), stocksize, size);

    if (pixbuf && size != wxDefaultSize &&
        (size.x != gdk_pixbuf_get_width(pixbuf) ||
         size.y != gdk_pixbuf_get_height(pixbuf)))
    {
        GdkPixbuf *p2 = gdk_pixbuf_scale_simple(pixbuf, size.x, size.y,
                                                GDK_INTERP_BILINEAR);
        if (p2)
        {
            g_object_unref (pixbuf);
            pixbuf = p2;
        }
    }

    return wxBitmap(pixbuf);
}

wxIconBundle
wxGTK2ArtProvider::CreateIconBundle(const wxArtID& id,
                                    const wxArtClient& WXUNUSED(client))
{
    const wxString stockid = wxArtIDToStock(id);

    // try to load the bundle as stock icon first
    GtkStyle* style = gtk_widget_get_style(wxGTKPrivate::GetButtonWidget());
    GtkIconSet* iconset = gtk_style_lookup_icon_set(style, stockid.utf8_str());
    if ( iconset )
    {
        GtkIconSize *sizes;
        gint n_sizes;
        gtk_icon_set_get_sizes(iconset, &sizes, &n_sizes);
        wxIconBundle bundle = DoCreateIconBundle
                              (
                                  stockid.utf8_str(),
                                  sizes, sizes + n_sizes,
                                  &CreateStockIcon
                              );
        g_free(sizes);
        return bundle;
    }

    // otherwise try icon themes
#ifdef __WXGTK26__
    if ( !gtk_check_version(2,6,0) )
    {
        gint *sizes = gtk_icon_theme_get_icon_sizes
                      (
                          gtk_icon_theme_get_default(),
                          stockid.utf8_str()
                      );
        if ( !sizes )
            return wxNullIconBundle;

        gint *last = sizes;
        while ( *last )
            last++;

        wxIconBundle bundle = DoCreateIconBundle
                              (
                                  stockid.utf8_str(),
                                  sizes, last,
                                  &CreateThemeIcon
                              );
        g_free(sizes);
        return bundle;
    }
#endif // __WXGTK26__

    return wxNullIconBundle;
}

// ----------------------------------------------------------------------------
// wxArtProvider::GetNativeSizeHint()
// ----------------------------------------------------------------------------

/*static*/
wxSize wxArtProvider::GetNativeSizeHint(const wxArtClient& client)
{
    // Gtk has specific sizes for each client, see artgtk.cpp
    GtkIconSize gtk_size = ArtClientToIconSize(client);
    // no size hints for this client
    if (gtk_size == GTK_ICON_SIZE_INVALID)
        return wxDefaultSize;
    gint width, height;
    gtk_icon_size_lookup( gtk_size, &width, &height);
    return wxSize(width, height);
}