src/gtk/button.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/gtk/button.cpp
   3 // Purpose:
   4 // Author:      Robert Roebling
   5 // Id:          $Id$
   6 // Copyright:   (c) 1998 Robert Roebling
   7 // Licence:     wxWindows licence
   8 /////////////////////////////////////////////////////////////////////////////
   9
  10 // For compilers that support precompilation, includes "wx.h".
  11 #include "wx/wxprec.h"
  12
  13 #if wxUSE_BUTTON
  14
  15 #ifndef WX_PRECOMP
  16     #include "wx/button.h"
  17 #endif
  18
  19 #include "wx/stockitem.h"
  20
  21 #include "wx/gtk/private.h"
  22 #include "wx/gtk/private/list.h"
  23
  24 // ----------------------------------------------------------------------------
  25 // GTK callbacks
  26 // ----------------------------------------------------------------------------
  27
  28 extern "C"
  29 {
  30
  31 static void
  32 wxgtk_button_clicked_callback(GtkWidget *WXUNUSED(widget), wxButton *button)
  33 {
  34     if ( button->GTKShouldIgnoreEvent() )
  35         return;
  36
  37     wxCommandEvent event(wxEVT_COMMAND_BUTTON_CLICKED, button->GetId());
  38     event.SetEventObject(button);
  39     button->HandleWindowEvent(event);
  40 }
  41
  42 //-----------------------------------------------------------------------------
  43 // "style_set" from m_widget
  44 //-----------------------------------------------------------------------------
  45
  46 static void
  47 wxgtk_button_style_set_callback(GtkWidget* widget, GtkStyle*, wxButton* win)
  48 {
  49     /* the default button has a border around it */
  50     wxWindow* parent = win->GetParent();
  51     if (parent && parent->m_wxwindow && gtk_widget_get_can_default(widget))
  52     {
  53         GtkBorder* border = NULL;
  54         gtk_widget_style_get(widget, "default_border", &border, NULL);
  55         if (border)
  56         {
  57             win->MoveWindow(
  58                 win->m_x - border->left,
  59                 win->m_y - border->top,
  60                 win->m_width + border->left + border->right,
  61                 win->m_height + border->top + border->bottom);
  62             gtk_border_free(border);
  63         }
  64     }
  65 }
  66
  67 } // extern "C"
  68
  69 //-----------------------------------------------------------------------------
  70 // wxButton
  71 //-----------------------------------------------------------------------------
  72
  73 bool wxButton::Create(wxWindow *parent,
  74                       wxWindowID id,
  75                       const wxString &label,
  76                       const wxPoint& pos,
  77                       const wxSize& size,
  78                       long style,
  79                       const wxValidator& validator,
  80                       const wxString& name)
  81 {
  82     if (!PreCreation( parent, pos, size ) ||
  83         !CreateBase( parent, id, pos, size, style, validator, name ))
  84     {
  85         wxFAIL_MSG( wxT("wxButton creation failed") );
  86         return false;
  87     }
  88
  89     // create either a standard button with text label (which may still contain
  90     // an image under GTK+ 2.6+) or a bitmap-only button if we don't have any
  91     // label
  92     const bool
  93         useLabel = !(style & wxBU_NOTEXT) && (!label.empty() || wxIsStockID(id));
  94     if ( useLabel )
  95     {
  96         m_widget = gtk_button_new_with_mnemonic("");
  97     }
  98     else // no label, suppose we will have a bitmap
  99     {
 100         m_widget = gtk_button_new();
 101
 102         GtkWidget *image = gtk_image_new();
 103         gtk_widget_show(image);
 104         gtk_container_add(GTK_CONTAINER(m_widget), image);
 105     }
 106
 107     g_object_ref(m_widget);
 108
 109     float x_alignment = 0.5;
 110     if (HasFlag(wxBU_LEFT))
 111         x_alignment = 0.0;
 112     else if (HasFlag(wxBU_RIGHT))
 113         x_alignment = 1.0;
 114
 115     float y_alignment = 0.5;
 116     if (HasFlag(wxBU_TOP))
 117         y_alignment = 0.0;
 118     else if (HasFlag(wxBU_BOTTOM))
 119         y_alignment = 1.0;
 120
 121     gtk_button_set_alignment(GTK_BUTTON(m_widget), x_alignment, y_alignment);
 122
 123     if ( useLabel )
 124         SetLabel(label);
 125
 126     if (style & wxNO_BORDER)
 127        gtk_button_set_relief( GTK_BUTTON(m_widget), GTK_RELIEF_NONE );
 128
 129     g_signal_connect_after (m_widget, "clicked",
 130                             G_CALLBACK (wxgtk_button_clicked_callback),
 131                             this);
 132
 133     g_signal_connect_after (m_widget, "style_set",
 134                             G_CALLBACK (wxgtk_button_style_set_callback),
 135                             this);
 136
 137     m_parent->DoAddChild( this );
 138
 139     PostCreation(size);
 140
 141     return true;
 142 }
 143
 144
 145 wxWindow *wxButton::SetDefault()
 146 {
 147     wxWindow *oldDefault = wxButtonBase::SetDefault();
 148
 149     gtk_widget_set_can_default(m_widget, TRUE);
 150     gtk_widget_grab_default( m_widget );
 151
 152     // resize for default border
 153     wxgtk_button_style_set_callback( m_widget, NULL, this );
 154
 155     return oldDefault;
 156 }
 157
 158 /* static */
 159 wxSize wxButtonBase::GetDefaultSize()
 160 {
 161     static wxSize size = wxDefaultSize;
 162     if (size == wxDefaultSize)
 163     {
 164         // NB: Default size of buttons should be same as size of stock
 165         //     buttons as used in most GTK+ apps. Unfortunately it's a little
 166         //     tricky to obtain this size: stock button's size may be smaller
 167         //     than size of button in GtkButtonBox and vice versa,
 168         //     GtkButtonBox's minimal button size may be smaller than stock
 169         //     button's size. We have to retrieve both values and combine them.
 170
 171         GtkWidget *wnd = gtk_window_new(GTK_WINDOW_TOPLEVEL);
 172         GtkWidget *box = gtk_hbutton_box_new();
 173         GtkWidget *btn = gtk_button_new_from_stock(GTK_STOCK_CANCEL);
 174         gtk_container_add(GTK_CONTAINER(box), btn);
 175         gtk_container_add(GTK_CONTAINER(wnd), box);
 176         GtkRequisition req;
 177         gtk_widget_size_request(btn, &req);
 178
 179         gint minwidth, minheight;
 180         gtk_widget_style_get(box,
 181                              "child-min-width", &minwidth,
 182                              "child-min-height", &minheight,
 183                              NULL);
 184
 185         size.x = wxMax(minwidth, req.width);
 186         size.y = wxMax(minheight, req.height);
 187
 188         gtk_widget_destroy(wnd);
 189     }
 190     return size;
 191 }
 192
 193 void wxButton::SetLabel( const wxString &lbl )
 194 {
 195     wxCHECK_RET( m_widget != NULL, wxT("invalid button") );
 196
 197     wxString label(lbl);
 198
 199     if (label.empty() && wxIsStockID(m_windowId))
 200         label = wxGetStockLabel(m_windowId);
 201
 202     wxAnyButton::SetLabel(label);
 203
 204     // don't use label if it was explicitly disabled
 205     if ( HasFlag(wxBU_NOTEXT) )
 206         return;
 207
 208     if (wxIsStockID(m_windowId) && wxIsStockLabel(m_windowId, label))
 209     {
 210         const char *stock = wxGetStockGtkID(m_windowId);
 211         if (stock)
 212         {
 213             gtk_button_set_label(GTK_BUTTON(m_widget), stock);
 214             gtk_button_set_use_stock(GTK_BUTTON(m_widget), TRUE);
 215             return;
 216         }
 217     }
 218
 219     // this call is necessary if the button had been initially created without
 220     // a (text) label -- then we didn't use gtk_button_new_with_mnemonic() and
 221     // so "use-underline" GtkButton property remained unset
 222     gtk_button_set_use_underline(GTK_BUTTON(m_widget), TRUE);
 223     const wxString labelGTK = GTKConvertMnemonics(label);
 224     gtk_button_set_label(GTK_BUTTON(m_widget), wxGTK_CONV(labelGTK));
 225     gtk_button_set_use_stock(GTK_BUTTON(m_widget), FALSE);
 226
 227     GTKApplyWidgetStyle( false );
 228 }
 229
 230 #if wxUSE_MARKUP
 231 bool wxButton::DoSetLabelMarkup(const wxString& markup)
 232 {
 233     wxCHECK_MSG( m_widget != NULL, false, "invalid button" );
 234
 235     const wxString stripped = RemoveMarkup(markup);
 236     if ( stripped.empty() && !markup.empty() )
 237         return false;
 238
 239     wxControl::SetLabel(stripped);
 240
 241     GtkLabel * const label = GTKGetLabel();
 242     wxCHECK_MSG( label, false, "no label in this button?" );
 243
 244     GTKSetLabelWithMarkupForLabel(label, markup);
 245
 246     return true;
 247 }
 248
 249 GtkLabel *wxButton::GTKGetLabel() const
 250 {
 251     GtkWidget* child = gtk_bin_get_child(GTK_BIN(m_widget));
 252     if ( GTK_IS_ALIGNMENT(child) )
 253     {
 254         GtkWidget* box = gtk_bin_get_child(GTK_BIN(child));
 255         GtkLabel* label = NULL;
 256         wxGtkList list(gtk_container_get_children(GTK_CONTAINER(box)));
 257         for (GList* item = list; item; item = item->next)
 258         {
 259             if (GTK_IS_LABEL(item->data))
 260                 label = GTK_LABEL(item->data);
 261         }
 262
 263         return label;
 264     }
 265
 266     return GTK_LABEL(child);
 267 }
 268 #endif // wxUSE_MARKUP
 269
 270 void wxButton::DoApplyWidgetStyle(GtkRcStyle *style)
 271 {
 272     gtk_widget_modify_style(m_widget, style);
 273     GtkWidget* child = gtk_bin_get_child(GTK_BIN(m_widget));
 274     gtk_widget_modify_style(child, style);
 275
 276     // for buttons with images, the path to the label is (at least in 2.12)
 277     // GtkButton -> GtkAlignment -> GtkHBox -> GtkLabel
 278     if ( GTK_IS_ALIGNMENT(child) )
 279     {
 280         GtkWidget* box = gtk_bin_get_child(GTK_BIN(child));
 281         if ( GTK_IS_BOX(box) )
 282         {
 283             wxGtkList list(gtk_container_get_children(GTK_CONTAINER(box)));
 284             for (GList* item = list; item; item = item->next)
 285             {
 286                 gtk_widget_modify_style(GTK_WIDGET(item->data), style);
 287             }
 288         }
 289     }
 290 }
 291
 292 wxSize wxButton::DoGetBestSize() const
 293 {
 294     // the default button in wxGTK is bigger than the other ones because of an
 295     // extra border around it, but we don't want to take it into account in
 296     // our size calculations (otherwise the result is visually ugly), so
 297     // always return the size of non default button from here
 298     const bool isDefault = gtk_widget_has_default(m_widget);
 299     if ( isDefault )
 300     {
 301         // temporarily unset default flag
 302         gtk_widget_set_can_default(m_widget, FALSE);
 303     }
 304
 305     wxSize ret( wxAnyButton::DoGetBestSize() );
 306
 307     if ( isDefault )
 308     {
 309         // set it back again
 310         gtk_widget_set_can_default(m_widget, TRUE);
 311     }
 312
 313     if (!HasFlag(wxBU_EXACTFIT))
 314     {
 315         wxSize defaultSize = GetDefaultSize();
 316         if (ret.x < defaultSize.x)
 317             ret.x = defaultSize.x;
 318         if (ret.y < defaultSize.y)
 319             ret.y = defaultSize.y;
 320     }
 321
 322     CacheBestSize(ret);
 323     return ret;
 324 }
 325
 326 // static
 327 wxVisualAttributes
 328 wxButton::GetClassDefaultAttributes(wxWindowVariant WXUNUSED(variant))
 329 {
 330     return GetDefaultAttributesFromGTKWidget(gtk_button_new);
 331 }
 332
 333 #endif // wxUSE_BUTTON