-/*
- * Main constrained layout algorithm. Look at all the child
- * windows, and their constraints (if any).
- * The idea is to keep iterating through the constraints
- * until all left, right, bottom and top edges, and widths and heights,
- * are known (or no change occurs and we've failed to resolve all
- * constraints).
- *
- * If the user has not specified a dimension or edge, it will be
- * be calculated from the other known values. E.g. If we know
- * the right hand edge and the left hand edge, we now know the width.
- * The snag here is that this means we must specify absolute dimensions
- * twice (in constructor and in constraint), if we wish to use the
- * constraint notation to just set the position, for example.
- * Otherwise, if we only set ONE edge and no dimension, it would never
- * find the other edge.
- *
- * Algorithm:
-
- Mark all constraints as not done.
-
- iterations = 0;
- until no change or iterations >= max iterations
- For each child:
- {
- Calculate all constraints
- }
- iterations ++;
-
- For each child
- Set each calculated position and size
-
- */
-
-#if WXWIN_COMPATIBILITY
-bool wxOldDoLayout(wxWindowBase *win)
-{
- // Make sure this isn't called recursively from below
- static wxList doneSoFar;
-
- if (doneSoFar.Member(win))
- return TRUE;
-
- doneSoFar.Append(win);
-
- wxNode *node = win->GetChildren().First();
- while (node)
- {
- wxWindowBase *child = (wxWindowBase *)node->Data();
- wxLayoutConstraints *constr = child->GetConstraints();
- if (constr)
- {
- constr->left.SetDone(FALSE);
- constr->top.SetDone(FALSE);
- constr->right.SetDone(FALSE);
- constr->bottom.SetDone(FALSE);
- constr->width.SetDone(FALSE);
- constr->height.SetDone(FALSE);
- constr->centreX.SetDone(FALSE);
- constr->centreY.SetDone(FALSE);
- }
- node = node->Next();
- }
- int noIterations = 0;
- int maxIterations = 500;
- int noChanges = 1;
-
- while ((noChanges > 0) && (noIterations < maxIterations))
- {
- noChanges = 0;
- wxNode *node = win->GetChildren().First();
- while (node)
- {
- wxWindowBase *child = (wxWindowBase *)node->Data();
- wxLayoutConstraints *constr = child->GetConstraints();
- if (constr)
- {
- int tempNoChanges = 0;
- (void)constr->SatisfyConstraints(child, &tempNoChanges);
- noChanges += tempNoChanges;
- }
- node = node->Next();
- }
- noIterations ++;
- }
-/*
- // Would be nice to have a test here to see _which_ constraint(s)
- // failed, so we can print a specific diagnostic message.
- if (noFailures > 0)
- {
- wxDebugMsg(_("wxWindowBase::Layout() failed.\n"));
- }
-*/
- // Now set the sizes and positions of the children, and
- // recursively call Layout().
- node = win->GetChildren().First();
- while (node)
- {
- wxWindowBase *child = (wxWindowBase *)node->Data();
- wxLayoutConstraints *constr = child->GetConstraints();
- if (constr && constr->left.GetDone() && constr->right.GetDone() &&
- constr->width.GetDone() && constr->height.GetDone())
- {
- int x = constr->left.GetValue();
- int y = constr->top.GetValue();
- int w = constr->width.GetValue();
- int h = constr->height.GetValue();
-
- // If we don't want to resize this window, just move it...
- if ((constr->width.GetRelationship() != wxAsIs) ||
- (constr->height.GetRelationship() != wxAsIs))
- {
- // _Should_ call Layout() recursively.
- child->SetSize(x, y, w, h);
- }
- else
- {
- child->Move(x, y);
- }
- }
- else
- child->Layout();
- node = node->Next();
- }
- doneSoFar.DeleteObject(win);
-
- return TRUE;
-}
-#endif // WXWIN_COMPATIBILITY
-
projects / wxWidgets.git / blobdiff