wxSize wxCollapsiblePane::DoGetBestSize() const { wxASSERT_MSG( m_widget, wxT("DoGetBestSize called before creation") ); wxSize sz = m_szCollapsed; if ( IsExpanded() ) { wxSize panesz = GetPane()->GetBestSize(); sz.x = wxMax(sz.x, panesz.x); sz.y += gtk_expander_get_spacing(GTK_EXPANDER(m_widget)) + panesz.y; } return sz; }
static void gtk_collapsiblepane_expanded_callback(GObject * WXUNUSED(object), GParamSpec * WXUNUSED(param_spec), wxCollapsiblePane *p) { // NB: unlike for the "activate" signal, when this callback is called, if // we try to query the "collapsed" status through p->IsCollapsed(), we // get the right value. I.e. here p->IsCollapsed() will return false if // this callback has been called at the end of a collapsed->expanded // transition and viceversa. Inside the "activate" signal callback // p->IsCollapsed() would return the wrong value! wxSize sz; if ( p->IsExpanded() ) { // NB: we cannot use the p->GetBestSize() or p->GetMinSize() functions // here as they would return the size for the collapsed expander // even if the collapsed->expanded transition has already been // completed; we solve this problem doing: sz = p->m_szCollapsed; wxSize panesz = p->GetPane()->GetBestSize(); sz.x = wxMax(sz.x, panesz.x); sz.y += gtk_expander_get_spacing(GTK_EXPANDER(p->m_widget)) + panesz.y; } else // collapsed { // same problem described above: using p->Get[Best|Min]Size() here we // would get the size of the control when it is expanded even if the // expanded->collapsed transition should be complete now... // So, we use the size cached at control-creation time... sz = p->m_szCollapsed; } // VERY IMPORTANT: // just calling // p->OnStateChange(sz); // here would work work BUT: // 1) in the expanded->collapsed transition it provokes a lot of flickering // 2) in the collapsed->expanded transition using the "Change status" wxButton // in samples/collpane application some strange warnings would be generated // by the "clearlooks" theme, if that's your theme. // // So we prefer to use some GTK+ native optimized calls, which prevent too many resize // calculations to happen. Note that the following code has been very carefully designed // and tested - be VERY careful when changing it! // 1) need to update our size hints // NB: this function call won't actually do any long operation // (redraw/relayout/resize) so that it's flicker-free p->SetMinSize(sz); if (p->HasFlag(wxCP_NO_TLW_RESIZE)) { // fire an event wxCollapsiblePaneEvent ev(p, p->GetId(), p->IsCollapsed()); p->HandleWindowEvent(ev); // the user asked to explicitly handle the resizing itself... return; } wxTopLevelWindow * top = wxDynamicCast(wxGetTopLevelParent(p), wxTopLevelWindow); if ( top && top->GetSizer() ) { // 2) recalculate minimal size of the top window sz = top->GetSizer()->CalcMin(); if (top->m_mainWidget) { // 3) MAGIC HACK: if you ever used GtkExpander in a GTK+ program // you know that this magic call is required to make it possible // to shrink the top level window in the expanded->collapsed // transition. This may be sometimes undesired but *is* // necessary and if you look carefully, all GTK+ programs using // GtkExpander perform this trick (e.g. the standard "open file" // dialog of GTK+>=2.4 is not resizable when the expander is // collapsed!) gtk_window_set_resizable (GTK_WINDOW (top->m_widget), p->IsExpanded()); // 4) set size hints top->SetMinClientSize(sz); // 5) set size top->SetClientSize(sz); } } if ( p->m_bIgnoreNextChange ) { // change generated programmatically - do not send an event! p->m_bIgnoreNextChange = false; return; } // fire an event wxCollapsiblePaneEvent ev(p, p->GetId(), p->IsCollapsed()); p->HandleWindowEvent(ev); }