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