src/gtk/collpane.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/gtk/collpane.cpp
   3 // Purpose:     wxCollapsiblePane
   4 // Author:      Francesco Montorsi
   5 // Modified By:
   6 // Created:     8/10/2006
   7 // Id:          $Id$
   8 // Copyright:   (c) Francesco Montorsi
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12
  13 // ----------------------------------------------------------------------------
  14 // headers
  15 // ----------------------------------------------------------------------------
  16
  17 // For compilers that support precompilation, includes "wx.h".
  18 #include "wx/wxprec.h"
  19
  20 #ifdef __WXGTK24__
  21
  22 #include "wx/collpane.h"
  23 #include "wx/gtk/private.h"
  24
  25 #include <gtk/gtkexpander.h>
  26
  27 const wxChar wxCollapsiblePaneNameStr[] = wxT("CollapsiblePane");
  28
  29 // ============================================================================
  30 // implementation
  31 // ============================================================================
  32
  33 //-----------------------------------------------------------------------------
  34 // "notify::expanded" signal
  35 //-----------------------------------------------------------------------------
  36
  37 extern "C" {
  38
  39 static void gtk_collapsiblepane_expanded_callback (GObject    *object,
  40                                                     GParamSpec *param_spec,
  41                                                     wxCollapsiblePane *p)
  42 {
  43     // NB: unlike for the "activate" signal, when this callback is called, if
  44     //     we try to query the "collapsed" status through p->IsCollapsed(), we
  45     //     get the right value. I.e. here p->IsCollapsed() will return false if
  46     //     this callback has been called at the end of a collapsed->expanded
  47     //     transition and viceversa. Inside the "activate" signal callback
  48     //     p->IsCollapsed() would return the wrong value!
  49
  50     wxSize sz;
  51     if ( p->IsExpanded() )
  52     {
  53         // unfortunately there's no clean way to retrieve the minimal size of
  54         // the expanded pane in this handler or in other handlers for the
  55         // signals generated by user clicks on the GtkExpander button:
  56         // p->GetBestSize() or p->GetMinSize() would still return the size for
  57         // the collapsed expander even if the collapsed->expanded transition
  58         // has already been completed (this because GTK+ queues some resize
  59         // calls which still must be processed). So, the only solution to
  60         // correctly set the size hints for this window is to calculate the
  61         // expanded size ourselves, without relying on p->Get[Best|Min]Size:
  62         sz = p->GetMinSize();
  63         sz.SetWidth(wxMax(sz.x, p->GetPane()->GetMinSize().x));
  64         sz.SetHeight(sz.y + p->GetPane()->GetMinSize().y + 10);
  65     }
  66     else // collapsed
  67     {
  68         // same problem described above: using p->Get[Best|Min]Size() here we
  69         // would get the size of the control when it is expanded even if the
  70         // expanded->collapsed transition should be complete now...
  71         // So, we use the size cached at control-creation time...
  72         sz = p->m_szCollapsed;
  73     }
  74
  75     p->OnStateChange(sz);
  76
  77     if ( p->m_bIgnoreNextChange )
  78     {
  79         // change generated programmatically - do not send an event!
  80         p->m_bIgnoreNextChange = false;
  81         return;
  82     }
  83
  84     // fire an event
  85     wxCollapsiblePaneEvent ev(p, p->GetId(), p->IsCollapsed());
  86     p->GetEventHandler()->ProcessEvent(ev);
  87 }
  88 }
  89
  90 static void
  91 gtk_collapsiblepane_insert_callback(wxWindowGTK* parent, wxWindowGTK* child)
  92 {
  93     // this callback should be used only once to insert the "pane" into the
  94     // GtkExpander widget. wxGenericCollapsiblePane::DoAddChild() will check if
  95     // it has been called only once (and in any case we would get a warning
  96     // from the following call as GtkExpander is a GtkBin and can contain only
  97     // a single child!).
  98     gtk_container_add (GTK_CONTAINER (parent->m_widget), child->m_widget);
  99 }
 100
 101 //-----------------------------------------------------------------------------
 102 // wxCollapsiblePane
 103 //-----------------------------------------------------------------------------
 104
 105 IMPLEMENT_DYNAMIC_CLASS(wxCollapsiblePane, wxGenericCollapsiblePane)
 106
 107 BEGIN_EVENT_TABLE(wxCollapsiblePane, wxGenericCollapsiblePane)
 108     EVT_SIZE(wxCollapsiblePane::OnSize)
 109 END_EVENT_TABLE()
 110
 111 bool wxCollapsiblePane::Create(wxWindow *parent,
 112                                wxWindowID id,
 113                                const wxString& label,
 114                                const wxPoint& pos,
 115                                const wxSize& size,
 116                                long style,
 117                                const wxValidator& val,
 118                                const wxString& name)
 119 {
 120     if (gtk_check_version(2,4,0))
 121         return wxGenericCollapsiblePane::Create(parent, id, label,
 122                                                 pos, size, style, val, name);
 123
 124     m_needParent = true;
 125     m_acceptsFocus = true;
 126     m_bIgnoreNextChange = false;
 127
 128     if ( !PreCreation( parent, pos, size ) ||
 129           !wxControl::CreateBase(parent, id, pos, size, style, val, name) )
 130     {
 131         wxFAIL_MSG( wxT("wxCollapsiblePane creation failed") );
 132         return false;
 133     }
 134
 135     m_widget =
 136         gtk_expander_new_with_mnemonic(wxGTK_CONV(GTKConvertMnemonics(label)));
 137
 138     // see the gtk_collapsiblepane_expanded_callback comments to understand why
 139     // we connect to the "notify::expanded" signal instead of the more common
 140     // "activate" one
 141     g_signal_connect(m_widget, "notify::expanded",
 142                      G_CALLBACK(gtk_collapsiblepane_expanded_callback), this);
 143
 144     // before creating m_pPane, we need to makesure our own insert callback
 145     // will be used
 146     m_insertCallback = gtk_collapsiblepane_insert_callback;
 147
 148     // this the real "pane"
 149     m_pPane = new wxWindow(this, wxID_ANY, wxDefaultPosition, wxDefaultSize,
 150                            wxNO_BORDER);
 151
 152     gtk_widget_show( GTK_WIDGET(m_widget) );
 153     m_parent->DoAddChild( this );
 154
 155     PostCreation(size);
 156
 157     // remember the size of this control when it's collapsed
 158     m_szCollapsed = GetBestSize();
 159
 160     return true;
 161 }
 162
 163 wxSize wxCollapsiblePane::DoGetBestSize() const
 164 {
 165     if (!gtk_check_version(2,4,0))
 166     {
 167         wxASSERT_MSG( m_widget, wxT("DoGetBestSize called before creation") );
 168
 169         GtkRequisition req;
 170         req.width = 2;
 171         req.height = 2;
 172         (* GTK_WIDGET_CLASS( GTK_OBJECT_GET_CLASS(m_widget) )->size_request )
 173                 (m_widget, &req );
 174
 175         // notice that we do not cache our best size here as it changes
 176         return wxSize(req.width, req.height);
 177     }
 178
 179     return wxGenericCollapsiblePane::DoGetBestSize();
 180 }
 181
 182 void wxCollapsiblePane::Collapse(bool collapse)
 183 {
 184     if (!gtk_check_version(2,4,0))
 185     {
 186         // optimization
 187         if (IsCollapsed() == collapse)
 188             return;
 189
 190         // do not send event in next signal handler call
 191         m_bIgnoreNextChange = true;
 192         gtk_expander_set_expanded(GTK_EXPANDER(m_widget), !collapse);
 193     }
 194     else
 195         wxGenericCollapsiblePane::Collapse(collapse);
 196 }
 197
 198 bool wxCollapsiblePane::IsCollapsed() const
 199 {
 200     if (!gtk_check_version(2,4,0))
 201         return !gtk_expander_get_expanded(GTK_EXPANDER(m_widget));
 202
 203     return wxGenericCollapsiblePane::IsCollapsed();
 204 }
 205
 206 void wxCollapsiblePane::SetLabel(const wxString &str)
 207 {
 208     if (!gtk_check_version(2,4,0))
 209         gtk_expander_set_label(GTK_EXPANDER(m_widget), wxGTK_CONV(str));
 210     else
 211         wxGenericCollapsiblePane::SetLabel(str);
 212 }
 213
 214 void wxCollapsiblePane::OnSize(wxSizeEvent &ev)
 215 {
 216 #if 0       // for debug only
 217     wxClientDC dc(this);
 218     dc.SetPen(*wxBLACK_PEN);
 219     dc.SetBrush(*wxTRANSPARENT_BRUSH);
 220     dc.DrawRectangle(wxPoint(0,0), GetSize());
 221     dc.SetPen(*wxRED_PEN);
 222     dc.DrawRectangle(wxPoint(0,0), GetBestSize());
 223 #endif
 224
 225     // here we need to resize the pane window otherwise, even if the GtkExpander container
 226     // is expanded or shrinked, the pane window won't be updated!
 227     m_pPane->SetSize(ev.GetSize());
 228
 229     // we need to explicitely call m_pPane->Layout() or else it won't correctly relayout
 230     // (even if SetAutoLayout(true) has been called on it!)
 231     m_pPane->Layout();
 232 }
 233
 234 #endif //  __WXGTK24__
 235