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 #if wxUSE_COLLPANE && !defined(__WXUNIVERSAL__)
  21
  22 #include "wx/collpane.h"
  23 #include "wx/toplevel.h"
  24 #include "wx/sizer.h"
  25 #include "wx/panel.h"
  26
  27 #include "wx/gtk/private.h"
  28
  29 // the lines below duplicate the same definitions in collpaneg.cpp, if we have
  30 // another implementation of this class we should extract them to a common file
  31
  32 const wxChar wxCollapsiblePaneNameStr[] = wxT("collapsiblePane");
  33
  34 DEFINE_EVENT_TYPE(wxEVT_COMMAND_COLLPANE_CHANGED)
  35
  36 IMPLEMENT_DYNAMIC_CLASS(wxCollapsiblePaneEvent, wxCommandEvent)
  37
  38 // ============================================================================
  39 // implementation
  40 // ============================================================================
  41
  42 //-----------------------------------------------------------------------------
  43 // "notify::expanded" signal
  44 //-----------------------------------------------------------------------------
  45
  46 extern "C" {
  47
  48 static void
  49 gtk_collapsiblepane_expanded_callback(GObject * WXUNUSED(object),
  50                                       GParamSpec * WXUNUSED(param_spec),
  51                                       wxCollapsiblePane *p)
  52 {
  53     // NB: unlike for the "activate" signal, when this callback is called, if
  54     //     we try to query the "collapsed" status through p->IsCollapsed(), we
  55     //     get the right value. I.e. here p->IsCollapsed() will return false if
  56     //     this callback has been called at the end of a collapsed->expanded
  57     //     transition and viceversa. Inside the "activate" signal callback
  58     //     p->IsCollapsed() would return the wrong value!
  59
  60     wxSize sz;
  61     if ( p->IsExpanded() )
  62     {
  63         // NB: we cannot use the p->GetBestSize() or p->GetMinSize() functions
  64         //     here as they would return the size for the collapsed expander
  65         //     even if the collapsed->expanded transition has already been
  66         //     completed; we solve this problem doing:
  67
  68         sz = p->m_szCollapsed;
  69
  70         wxSize panesz = p->GetPane()->GetBestSize();
  71         sz.x = wxMax(sz.x, panesz.x);
  72         sz.y += gtk_expander_get_spacing(GTK_EXPANDER(p->m_widget)) + panesz.y;
  73     }
  74     else // collapsed
  75     {
  76         // same problem described above: using p->Get[Best|Min]Size() here we
  77         // would get the size of the control when it is expanded even if the
  78         // expanded->collapsed transition should be complete now...
  79         // So, we use the size cached at control-creation time...
  80         sz = p->m_szCollapsed;
  81     }
  82
  83     // VERY IMPORTANT:
  84     // just calling
  85     //          p->OnStateChange(sz);
  86     // here would work work BUT:
  87     //     1) in the expanded->collapsed transition it provokes a lot of flickering
  88     //     2) in the collapsed->expanded transition using the "Change status" wxButton
  89     //        in samples/collpane application some strange warnings would be generated
  90     //        by the "clearlooks" theme, if that's your theme.
  91     //
  92     // So we prefer to use some GTK+ native optimized calls, which prevent too many resize
  93     // calculations to happen. Note that the following code has been very carefully designed
  94     // and tested - be VERY careful when changing it!
  95
  96     // 1) need to update our size hints
  97     // NB: this function call won't actually do any long operation
  98     //     (redraw/relayouting/resizing) so that it's flicker-free
  99     p->SetMinSize(sz);
 100
 101     if (p->HasFlag(wxCP_NO_TLW_RESIZE))
 102     {
 103         // fire an event
 104         wxCollapsiblePaneEvent ev(p, p->GetId(), p->IsCollapsed());
 105         p->HandleWindowEvent(ev);
 106
 107         // the user asked to explicitely handle the resizing itself...
 108         return;
 109     }
 110
 111     wxTopLevelWindow *
 112         top = wxDynamicCast(wxGetTopLevelParent(p), wxTopLevelWindow);
 113     if ( top && top->GetSizer() )
 114     {
 115         // 2) recalculate minimal size of the top window
 116         sz = top->GetSizer()->CalcMin();
 117
 118         if (top->m_mainWidget)
 119         {
 120             // 3) MAGIC HACK: if you ever used GtkExpander in a GTK+ program you know
 121             //    that this magic call is required to make it possible to shrink the
 122             //    top level window in the expanded->collapsed transition.
 123             //    This may be sometimes undesired but *is* necessary and if you look
 124             //    carefully, all GTK+ programs using GtkExpander perform this trick
 125             //    (e.g. the standard "open file" dialog of GTK+>=2.4 is not resizeable
 126             //     when the expander is collapsed!)
 127             gtk_window_set_resizable (GTK_WINDOW (top->m_widget), p->IsExpanded());
 128
 129             // 4) set size hints
 130             top->SetSizeHints(sz.x, sz.y);
 131
 132             // 5) set size
 133             top->SetClientSize(sz);
 134         }
 135     }
 136
 137     if ( p->m_bIgnoreNextChange )
 138     {
 139         // change generated programmatically - do not send an event!
 140         p->m_bIgnoreNextChange = false;
 141         return;
 142     }
 143
 144     // fire an event
 145     wxCollapsiblePaneEvent ev(p, p->GetId(), p->IsCollapsed());
 146     p->HandleWindowEvent(ev);
 147 }
 148 }
 149
 150 static void
 151 gtk_collapsiblepane_insert_callback(wxWindowGTK* parent, wxWindowGTK* child)
 152 {
 153     // this callback should be used only once to insert the "pane" into the
 154     // GtkExpander widget. wxGenericCollapsiblePane::DoAddChild() will check if
 155     // it has been called only once (and in any case we would get a warning
 156     // from the following call as GtkExpander is a GtkBin and can contain only
 157     // a single child!).
 158     gtk_container_add (GTK_CONTAINER (parent->m_widget), child->m_widget);
 159 }
 160
 161 //-----------------------------------------------------------------------------
 162 // wxCollapsiblePane
 163 //-----------------------------------------------------------------------------
 164
 165 IMPLEMENT_DYNAMIC_CLASS(wxCollapsiblePane, wxControl)
 166
 167 BEGIN_EVENT_TABLE(wxCollapsiblePane, wxCollapsiblePaneBase)
 168     EVT_SIZE(wxCollapsiblePane::OnSize)
 169 END_EVENT_TABLE()
 170
 171 bool wxCollapsiblePane::Create(wxWindow *parent,
 172                                wxWindowID id,
 173                                const wxString& label,
 174                                const wxPoint& pos,
 175                                const wxSize& size,
 176                                long style,
 177                                const wxValidator& val,
 178                                const wxString& name)
 179 {
 180     m_bIgnoreNextChange = false;
 181
 182     if ( !PreCreation( parent, pos, size ) ||
 183           !wxControl::CreateBase(parent, id, pos, size, style, val, name) )
 184     {
 185         wxFAIL_MSG( wxT("wxCollapsiblePane creation failed") );
 186         return false;
 187     }
 188
 189     m_widget =
 190         gtk_expander_new_with_mnemonic(wxGTK_CONV(GTKConvertMnemonics(label)));
 191
 192     // see the gtk_collapsiblepane_expanded_callback comments to understand why
 193     // we connect to the "notify::expanded" signal instead of the more common
 194     // "activate" one
 195     g_signal_connect(m_widget, "notify::expanded",
 196                      G_CALLBACK(gtk_collapsiblepane_expanded_callback), this);
 197
 198     // before creating m_pPane, we need to makesure our own insert callback
 199     // will be used
 200     m_insertCallback = gtk_collapsiblepane_insert_callback;
 201
 202     // this the real "pane"
 203     m_pPane = new wxPanel(this, wxID_ANY, wxDefaultPosition, wxDefaultSize,
 204                            wxTAB_TRAVERSAL|wxNO_BORDER);
 205
 206     gtk_widget_show(m_widget);
 207     m_parent->DoAddChild( this );
 208
 209     PostCreation(size);
 210
 211     // remember the size of this control when it's collapsed
 212     m_szCollapsed = GetBestSize();
 213
 214     return true;
 215 }
 216
 217 wxSize wxCollapsiblePane::DoGetBestSize() const
 218 {
 219     wxASSERT_MSG( m_widget, wxT("DoGetBestSize called before creation") );
 220
 221     GtkRequisition req;
 222     req.width = 2;
 223     req.height = 2;
 224     (* GTK_WIDGET_CLASS( GTK_OBJECT_GET_CLASS(m_widget) )->size_request )
 225             (m_widget, &req );
 226
 227     // notice that we do not cache our best size here as it changes
 228     // all times the user expands/hide our pane
 229     return wxSize(req.width, req.height);
 230 }
 231
 232 void wxCollapsiblePane::Collapse(bool collapse)
 233 {
 234     // optimization
 235     if (IsCollapsed() == collapse)
 236         return;
 237
 238     // do not send event in next signal handler call
 239     m_bIgnoreNextChange = true;
 240     gtk_expander_set_expanded(GTK_EXPANDER(m_widget), !collapse);
 241 }
 242
 243 bool wxCollapsiblePane::IsCollapsed() const
 244 {
 245     return !gtk_expander_get_expanded(GTK_EXPANDER(m_widget));
 246 }
 247
 248 void wxCollapsiblePane::SetLabel(const wxString &str)
 249 {
 250     gtk_expander_set_label(GTK_EXPANDER(m_widget), wxGTK_CONV(str));
 251
 252     // FIXME: we need to update our collapsed width in some way but using GetBestSize()
 253     // we may get the size of the control with the pane size summed up if we are expanded!
 254     //m_szCollapsed.x = GetBestSize().x;
 255 }
 256
 257 void wxCollapsiblePane::OnSize(wxSizeEvent &ev)
 258 {
 259 #if 0       // for debug only
 260     wxClientDC dc(this);
 261     dc.SetPen(*wxBLACK_PEN);
 262     dc.SetBrush(*wxTRANSPARENT_BRUSH);
 263     dc.DrawRectangle(wxPoint(0,0), GetSize());
 264     dc.SetPen(*wxRED_PEN);
 265     dc.DrawRectangle(wxPoint(0,0), GetBestSize());
 266 #endif
 267
 268     // here we need to resize the pane window otherwise, even if the GtkExpander container
 269     // is expanded or shrinked, the pane window won't be updated!
 270     m_pPane->SetSize(ev.GetSize().x, ev.GetSize().y - m_szCollapsed.y);
 271
 272     // we need to explicitely call m_pPane->Layout() or else it won't correctly relayout
 273     // (even if SetAutoLayout(true) has been called on it!)
 274     m_pPane->Layout();
 275 }
 276
 277 #endif // wxUSE_COLLPANE && !defined(__WXUNIVERSAL__)
 278