src/generic/laywin.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        laywin.cpp
   3 // Purpose:     Implements a simple layout algorithm, plus
   4 //              wxSashLayoutWindow which is an example of a window with
   5 //              layout-awareness (via event handlers). This is suited to
   6 //              IDE-style window layout.
   7 // Author:      Julian Smart
   8 // Modified by:
   9 // Created:     04/01/98
  10 // RCS-ID:      $Id$
  11 // Copyright:   (c) Julian Smart
  12 // Licence:     wxWindows licence
  13 /////////////////////////////////////////////////////////////////////////////
  14
  15 #ifdef __GNUG__
  16 #pragma implementation "laywin.h"
  17 #endif
  18
  19 // For compilers that support precompilation, includes "wx/wx.h".
  20 #include "wx/wxprec.h"
  21
  22 #ifdef __BORLANDC__
  23 #pragma hdrstop
  24 #endif
  25
  26 #ifndef WX_PRECOMP
  27 #include "wx/wx.h"
  28 #include "wx/mdi.h"
  29 #endif
  30
  31 #include "wx/laywin.h"
  32
  33 IMPLEMENT_DYNAMIC_CLASS(wxQueryLayoutInfoEvent, wxEvent)
  34 IMPLEMENT_DYNAMIC_CLASS(wxCalculateLayoutEvent, wxEvent)
  35
  36 const int wxEVT_QUERY_LAYOUT_INFO = wxNewEventType();
  37 const int wxEVT_CALCULATE_LAYOUT = wxNewEventType();
  38
  39 #if wxUSE_SASH
  40 IMPLEMENT_CLASS(wxSashLayoutWindow, wxSashWindow)
  41
  42 BEGIN_EVENT_TABLE(wxSashLayoutWindow, wxSashWindow)
  43     EVT_CALCULATE_LAYOUT(wxSashLayoutWindow::OnCalculateLayout)
  44     EVT_QUERY_LAYOUT_INFO(wxSashLayoutWindow::OnQueryLayoutInfo)
  45 END_EVENT_TABLE()
  46
  47 bool wxSashLayoutWindow::Create(wxWindow *parent, wxWindowID id, const wxPoint& pos,
  48         const wxSize& size, long style, const wxString& name)
  49 {
  50     return wxSashWindow::Create(parent, id, pos, size, style, name);
  51 }
  52
  53 void wxSashLayoutWindow::Init()
  54 {
  55     m_orientation = wxLAYOUT_HORIZONTAL;
  56     m_alignment = wxLAYOUT_TOP;
  57 }
  58
  59 // This is the function that wxLayoutAlgorithm calls to ascertain the window
  60 // dimensions.
  61 void wxSashLayoutWindow::OnQueryLayoutInfo(wxQueryLayoutInfoEvent& event)
  62 {
  63   //    int flags = event.GetFlags();
  64     int requestedLength = event.GetRequestedLength();
  65
  66     event.SetOrientation(m_orientation);
  67     event.SetAlignment(m_alignment);
  68
  69     if (m_orientation == wxLAYOUT_HORIZONTAL)
  70         event.SetSize(wxSize(requestedLength, m_defaultSize.y));
  71     else
  72         event.SetSize(wxSize(m_defaultSize.x, requestedLength));
  73 }
  74
  75 // Called by parent to allow window to take a bit out of the
  76 // client rectangle, and size itself if not in wxLAYOUT_QUERY mode.
  77
  78 void wxSashLayoutWindow::OnCalculateLayout(wxCalculateLayoutEvent& event)
  79 {
  80     wxRect clientSize(event.GetRect());
  81
  82     int flags = event.GetFlags();
  83
  84     if (!IsShown())
  85         return;
  86
  87     // Let's assume that all windows stretch the full extent of the window in
  88     // the direction of that window orientation. This will work for non-docking toolbars,
  89     // and the status bar. Note that the windows have to have been created in a certain
  90     // order to work, else you might get a left-aligned window going to the bottom
  91     // of the window, and the status bar appearing to the right of it. The
  92     // status bar would have to be created after or before the toolbar(s).
  93
  94     wxRect thisRect;
  95
  96     // Try to stretch
  97     int length = (GetOrientation() == wxLAYOUT_HORIZONTAL) ? clientSize.width : clientSize.height;
  98     wxLayoutOrientation orient = GetOrientation();
  99
 100     // We assume that a window that says it's horizontal, wants to be stretched in that
 101     // direction. Is this distinction too fine? Do we assume that any horizontal
 102     // window needs to be stretched in that direction? Possibly.
 103     int whichDimension = (GetOrientation() == wxLAYOUT_HORIZONTAL) ? wxLAYOUT_LENGTH_X : wxLAYOUT_LENGTH_Y;
 104
 105     wxQueryLayoutInfoEvent infoEvent(GetId());
 106     infoEvent.SetEventObject(this);
 107     infoEvent.SetRequestedLength(length);
 108     infoEvent.SetFlags(orient | whichDimension);
 109
 110     if (!GetEventHandler()->ProcessEvent(infoEvent))
 111         return;
 112
 113     wxSize sz = infoEvent.GetSize();
 114
 115     if (sz.x == 0 && sz.y == 0) // Assume it's invisible
 116         return;
 117
 118     // Now we know the size it wants to be. We wish to decide where to place it, i.e.
 119     // how it's aligned.
 120     switch (GetAlignment())
 121     {
 122         case wxLAYOUT_TOP:
 123         {
 124             thisRect.x = clientSize.x; thisRect.y = clientSize.y;
 125             thisRect.width = sz.x; thisRect.height = sz.y;
 126             clientSize.y += thisRect.height;
 127             clientSize.height -= thisRect.height;
 128             break;
 129         }
 130         case wxLAYOUT_LEFT:
 131         {
 132             thisRect.x = clientSize.x; thisRect.y = clientSize.y;
 133             thisRect.width = sz.x; thisRect.height = sz.y;
 134             clientSize.x += thisRect.width;
 135             clientSize.width -= thisRect.width;
 136             break;
 137         }
 138         case wxLAYOUT_RIGHT:
 139         {
 140             thisRect.x = clientSize.x + (clientSize.width - sz.x); thisRect.y = clientSize.y;
 141             thisRect.width = sz.x; thisRect.height = sz.y;
 142             clientSize.width -= thisRect.width;
 143             break;
 144         }
 145         case wxLAYOUT_BOTTOM:
 146         {
 147             thisRect.x = clientSize.x; thisRect.y = clientSize.y + (clientSize.height - sz.y);
 148             thisRect.width = sz.x; thisRect.height = sz.y;
 149             clientSize.height -= thisRect.height;
 150             break;
 151         }
 152         case wxLAYOUT_NONE:
 153         {
 154             break;
 155         }
 156
 157     }
 158
 159     if ((flags & wxLAYOUT_QUERY) == 0)
 160     {
 161         // If not in query mode, resize the window.
 162         // TODO: add wxRect& form to wxWindow::SetSize
 163         wxSize sz = GetSize();
 164         wxPoint pos = GetPosition();
 165         SetSize(thisRect.x, thisRect.y, thisRect.width, thisRect.height);
 166
 167         // Make sure the sash is erased when the window is resized
 168         if ((pos.x != thisRect.x || pos.y != thisRect.y || sz.x != thisRect.width || sz.y != thisRect.height) &&
 169             (GetSashVisible(wxSASH_TOP) || GetSashVisible(wxSASH_RIGHT) || GetSashVisible(wxSASH_BOTTOM) || GetSashVisible(wxSASH_LEFT)))
 170             Refresh(TRUE);
 171
 172     }
 173
 174     event.SetRect(clientSize);
 175 }
 176 #endif // wxUSE_SASH
 177
 178 /*
 179  * wxLayoutAlgorithm
 180  */
 181
 182 // Lays out windows for an MDI frame. The MDI client area gets what's left
 183 // over.
 184 bool wxLayoutAlgorithm::LayoutMDIFrame(wxMDIParentFrame* frame, wxRect* r)
 185 {
 186     int cw, ch;
 187     frame->GetClientSize(& cw, & ch);
 188
 189     wxRect rect(0, 0, cw, ch);
 190     if (r)
 191         rect = * r;
 192
 193     wxCalculateLayoutEvent event;
 194     event.SetRect(rect);
 195
 196     wxNode* node = frame->GetChildren().First();
 197     while (node)
 198     {
 199         wxWindow* win = (wxWindow*) node->Data();
 200
 201         event.SetId(win->GetId());
 202         event.SetEventObject(win);
 203         event.SetFlags(0); // ??
 204
 205         win->GetEventHandler()->ProcessEvent(event);
 206
 207         node = node->Next();
 208     }
 209
 210     wxWindow* clientWindow = frame->GetClientWindow();
 211
 212     rect = event.GetRect();
 213
 214     clientWindow->SetSize(rect.x, rect.y, rect.width, rect.height);
 215
 216     return TRUE;
 217 }
 218
 219 // Layout algorithm for any window. mainWindow gets what's left over.
 220 bool wxLayoutAlgorithm::LayoutWindow(wxWindow* parent, wxWindow* mainWindow)
 221 {
 222     // Test if the parent is a sash window, and if so,
 223     // reduce the available space to allow space for any active edges.
 224
 225     int leftMargin = 0, rightMargin = 0, topMargin = 0, bottomMargin = 0;
 226 #if wxUSE_SASH
 227     if (parent->IsKindOf(CLASSINFO(wxSashWindow)))
 228     {
 229         wxSashWindow* sashWindow = (wxSashWindow*) parent;
 230
 231         leftMargin = sashWindow->GetExtraBorderSize();
 232         rightMargin = sashWindow->GetExtraBorderSize();
 233         topMargin = sashWindow->GetExtraBorderSize();
 234         bottomMargin = sashWindow->GetExtraBorderSize();
 235
 236         if (sashWindow->GetSashVisible(wxSASH_LEFT))
 237             leftMargin += sashWindow->GetDefaultBorderSize();
 238         if (sashWindow->GetSashVisible(wxSASH_RIGHT))
 239             rightMargin += sashWindow->GetDefaultBorderSize();
 240         if (sashWindow->GetSashVisible(wxSASH_TOP))
 241             topMargin += sashWindow->GetDefaultBorderSize();
 242         if (sashWindow->GetSashVisible(wxSASH_BOTTOM))
 243             bottomMargin += sashWindow->GetDefaultBorderSize();
 244     }
 245 #endif // wxUSE_SASH
 246
 247     int cw, ch;
 248     parent->GetClientSize(& cw, & ch);
 249
 250     wxRect rect(leftMargin, topMargin, cw - leftMargin - rightMargin, ch - topMargin - bottomMargin);
 251
 252     wxCalculateLayoutEvent event;
 253     event.SetRect(rect);
 254
 255     // Find the last layout-aware window, so we can make it fill all remaining
 256     // space.
 257     wxWindow* lastAwareWindow = NULL;
 258     wxNode* node = parent->GetChildren().First();
 259     while (node)
 260     {
 261         wxWindow* win = (wxWindow*) node->Data();
 262
 263         if (win->IsShown())
 264         {
 265             wxCalculateLayoutEvent tempEvent(win->GetId());
 266             tempEvent.SetEventObject(win);
 267             tempEvent.SetFlags(wxLAYOUT_QUERY);
 268             tempEvent.SetRect(event.GetRect());
 269             if (win->GetEventHandler()->ProcessEvent(tempEvent))
 270                 lastAwareWindow = win;
 271         }
 272
 273         node = node->Next();
 274     }
 275
 276     // Now do a dummy run to see if we have any space left for the final window (fail if not)
 277     node = parent->GetChildren().First();
 278     while (node)
 279     {
 280         wxWindow* win = (wxWindow*) node->Data();
 281
 282         // If mainWindow is NULL and we're at the last window,
 283         // skip this, because we'll simply make it fit the remaining space.
 284         if (win->IsShown() && (win != mainWindow) && (mainWindow != NULL || win != lastAwareWindow))
 285         {
 286             event.SetId(win->GetId());
 287             event.SetEventObject(win);
 288             event.SetFlags(wxLAYOUT_QUERY);
 289
 290             win->GetEventHandler()->ProcessEvent(event);
 291         }
 292
 293         node = node->Next();
 294     }
 295
 296     if (event.GetRect().GetWidth() < 0 || event.GetRect().GetHeight() < 0)
 297         return FALSE;
 298
 299     event.SetRect(rect);
 300
 301     node = parent->GetChildren().First();
 302     while (node)
 303     {
 304         wxWindow* win = (wxWindow*) node->Data();
 305
 306         // If mainWindow is NULL and we're at the last window,
 307         // skip this, because we'll simply make it fit the remaining space.
 308         if (win->IsShown() && (win != mainWindow) && (mainWindow != NULL || win != lastAwareWindow))
 309         {
 310             event.SetId(win->GetId());
 311             event.SetEventObject(win);
 312             event.SetFlags(0); // ??
 313
 314             win->GetEventHandler()->ProcessEvent(event);
 315         }
 316
 317         node = node->Next();
 318     }
 319
 320     rect = event.GetRect();
 321
 322     if (mainWindow)
 323         mainWindow->SetSize(rect.x, rect.y, wxMax(0, rect.width), wxMax(0, rect.height));
 324     else if (lastAwareWindow)
 325     {
 326         // Fit the remaining space
 327         lastAwareWindow->SetSize(rect.x, rect.y, wxMax(0, rect.width), wxMax(0, rect.height));
 328     }
 329
 330     return TRUE;
 331 }
 332