protected override void OnSizeRequested(ref Gtk.Requisition requisition)
{
base.OnSizeRequested(ref requisition);
IWidgetSurface ws = Frontend.Surface;
int h, w;
if (ws.SizeRequestMode == SizeRequestMode.HeightForWidth)
{
w = (int)ws.GetPreferredWidth().MinSize;
h = (int)ws.GetPreferredHeightForWidth(w).MinSize;
}
else
{
h = (int)ws.GetPreferredHeight().MinSize;
w = (int)ws.GetPreferredWidthForHeight(h).MinSize;
}
if (requisition.Width < w)
{
requisition.Width = w;
}
if (requisition.Height < h)
{
requisition.Height = h;
}
foreach (var cr in children)
{
cr.Key.SizeRequest();
}
}
void OnChildPreferredSizeChanged()
{
IWidgetSurface surface = this;
if (Parent != null && resizeRequestQueue.Contains(Parent))
{
// Size for this widget will be checked when checking the parent
surface.ResetCachedSizes();
return;
}
// Determine if the size change of the child implies a size change
// of this widget. If it does, the size change notification
// has to be propagated to the parent
var oldWidth = width;
var oldHeight = height;
surface.ResetCachedSizes();
bool changed = true;
if (surface.SizeRequestMode == SizeRequestMode.HeightForWidth)
{
var nw = surface.GetPreferredWidth();
if (nw == oldWidth)
{
var nh = surface.GetPreferredHeightForWidth(Backend.Size.Width);
if (nh == oldHeight)
{
changed = false;
}
}
}
else
{
var nh = surface.GetPreferredHeight();
if (nh == oldHeight)
{
var nw = surface.GetPreferredWidthForHeight(Backend.Size.Height);
if (nw == oldWidth)
{
changed = false;
}
}
}
if (changed)
{
NotifySizeChangeToParent();
}
else
{
QueueForReallocate(this);
}
}
protected virtual void OnChildPreferredSizeChanged(Widget w)
{
if (Parent != null && (!widthCached || !heightCached))
{
Parent.OnChildPreferredSizeChanged(w);
return;
}
var oldWidth = width;
var oldHeight = height;
bool notifyParent = Parent != null;
IWidgetSurface surface = this;
surface.ResetCachedSizes();
if (surface.SizeRequestMode == SizeRequestMode.HeightForWidth)
{
var nw = surface.GetPreferredWidth();
if (nw == oldWidth)
{
var nh = surface.GetPreferredHeightForWidth(Backend.Size.Width);
if (nh == oldHeight)
{
notifyParent = false;
}
}
}
else
{
var nh = surface.GetPreferredHeight();
if (nh == oldHeight)
{
var nw = surface.GetPreferredWidthForHeight(Backend.Size.Height);
if (nw == oldWidth)
{
notifyParent = false;
}
}
}
if (notifyParent)
{
if (Parent != null)
{
Parent.OnChildPreferredSizeChanged(this);
}
}
else
{
surface.Reallocate();
}
}
WidgetSize GetPreferredLengthForSize(SizeRequestMode mode, Widget w, double width)
{
IWidgetSurface surface = w;
if (mode == SizeRequestMode.WidthForHeight)
{
return(surface.GetPreferredWidthForHeight(width));
}
else
{
return(surface.GetPreferredHeightForWidth(width));
}
}