/**
*
* Arrange the Viewport and scrollbars conventionally within
* the specified width and height: vertical scrollbar on the
* right, horizontal scrollbar along the bottom.
*
* Scrollbars for which the corresponding scrollPolicy=auto
* are made visible if the Viewport's content size is bigger
* than the actual size. This introduces the possibility of
* validateSize,DisplayList() looping because the measure()
* method computes the size of the Viewport and the currently
* visible scrollbars.
*
*/
override internal void UpdateDisplayList(float w, float h)
{
//Debug.Log("UpdateDisplayList: " + w + ", " + h);
Scroller scroller = GetScroller();
if (null == scroller)
{
return;
}
IViewport viewport = scroller.Viewport;
ScrollBarBase hsb = scroller.HorizontalScrollBar;
ScrollBarBase vsb = scroller.VerticalScrollBar;
float minViewportInset = scroller.MinViewportInset;
float contentW = 0;
float contentH = 0;
if (null != viewport)
{
Point contentSize = GetLayoutContentSize(viewport);
contentW = contentSize.X;
contentH = contentSize.Y;
}
// If the Viewport's size has been explicitly set (not typical) then use it
// The initial values for viewportW,H are only used to decide if auto scrollbars
// should be shown.
Component viewportUIC = viewport as Component;
//Debug.Log("viewportUIC: " + viewportUIC);
//Debug.Log("viewportUIC.ExplicitWidth: " + viewportUIC.ExplicitWidth);
float?explicitViewportW = null != viewportUIC ? viewportUIC.ExplicitWidth : null;
float?explicitViewportH = null != viewportUIC ? viewportUIC.ExplicitHeight : null;
//Debug.Log("explicitViewportW: " + explicitViewportW + "; explicitViewportH: " + explicitViewportH);
float?viewportW = (null == explicitViewportW) ? (w - (minViewportInset * 2)) : explicitViewportW; // TODO: 0?
float?viewportH = (null == explicitViewportH) ? (h - (minViewportInset * 2)) : explicitViewportH; // TODO: 0?
//Debug.Log("viewportW: " + viewportW + "; viewportH: " + viewportH);
// Decide which scrollbars will be visible based on the Viewport's content size
// and the scroller's scroll policies. A scrollbar is shown if the content size
// greater than the Viewport's size by at least SDT.
bool oldShowHSB = HsbVisible;
bool oldShowVSB = VsbVisible;
bool hAuto = false;
//bool hsbTakeUpSpace = true; // if visible
switch ((ScrollPolicy)scroller.GetStyle("horizontalScrollPolicy"))
{
case ScrollPolicy.On:
//_canScrollHorizontally = true;
HsbVisible = true;
break;
case ScrollPolicy.Auto:
if (null != hsb && null != viewport)
{
hAuto = true;
// = (contentW >= (viewportW + SDT));
//HsbVisible = (null != hsb && _canScrollHorizontally);
HsbVisible = (contentW >= (viewportW + SDT));
}
break;
default:
//_canScrollHorizontally = false;
HsbVisible = false;
break;
}
bool vAuto = false;
//bool vsbTakeUpSpace = true; // if visible
switch ((ScrollPolicy)scroller.GetStyle("verticalScrollPolicy"))
{
case ScrollPolicy.On:
//_canScrollVertically = true;
VsbVisible = true;
break;
case ScrollPolicy.Auto:
if (null != vsb && null != viewport)
{
vAuto = true;
//_canScrollVertically = (contentH >= (viewportH + SDT));
//VsbVisible = (null != vsb && _canScrollVertically);
VsbVisible = (contentH >= (viewportH + SDT));
}
break;
default:
//_canScrollVertically = false;
VsbVisible = false;
break;
}
// // if in touch mode, only show scrollbars if a scroll is currently in progress
// if ((InteractionMode)scroller.GetStyle("interactionMode") == InteractionMode.Touch)
// {
// hsbTakeUpSpace = false;
// HsbVisible = scroller.horizontalScrollInProgress;
//
// vsbTakeUpSpace = false;
// VsbVisible = scroller.verticalScrollInProgress;
// }
// Reset the Viewport's width,height to account for the visible scrollbars, unless
// the Viewport's size was explicitly set, then we just use that.
if (null == explicitViewportW) // || 0 == explicitViewportW) // TODO: 0? // if (null == explicitViewportW)
{
viewportW = w - ((VsbVisible) ? (minViewportInset + VsbRequiredWidth()) : (minViewportInset * 2));
}
else
{
viewportW = explicitViewportW;
}
//Debug.Log("w: " + w);
//Debug.Log("viewportW: " + viewportW);
if (null == explicitViewportH) // || 0 == explicitViewportH) // TODO: 0? // if (null == explicitViewportH)
{
viewportH = h - ((HsbVisible) ? (minViewportInset + HsbRequiredHeight()) : (minViewportInset * 2));
}
else
{
viewportH = explicitViewportH;
}
//Debug.Log("h: " + h);
//Debug.Log("viewportH: " + viewportH);
// If the scrollBarPolicy is auto, and we're only showing one scrollbar,
// the Viewport may have shrunk enough to require showing the other one.
bool hsbIsDependent = false;
bool vsbIsDependent = false;
if (VsbVisible && !HsbVisible && hAuto && (contentW >= (viewportW + SDT)))
{
HsbVisible = hsbIsDependent = true;
}
else if (!VsbVisible && HsbVisible && vAuto && (contentH >= (viewportH + SDT)))
{
VsbVisible = vsbIsDependent = true;
}
// If the HSB doesn't fit, hide it and give the space back. Likewise for VSB.
// If both scrollbars are supposed to be visible but they don't both fit,
// then prefer to show the "non-dependent" auto scrollbar if we added the second
// "dependent" auto scrollbar because of the space consumed by the first.
if (HsbVisible && VsbVisible)
{
if (HsbFits(w, h, true) && VsbFits(w, h, true))
{
// Both scrollbars fit, we're done.
}
else if (!HsbFits(w, h, false) && !VsbFits(w, h, false))
{
// Neither scrollbar would fit, even if the other scrollbar wasn't visible.
HsbVisible = false;
VsbVisible = false;
}
else
{
// Only one of the scrollbars will fit. If we're showing a second "dependent"
// auto scrollbar because the first scrollbar consumed enough space to
// require it, if the first scrollbar doesn't fit, don't show either of them.
if (hsbIsDependent)
{
if (VsbFits(w, h, false)) // VSB will fit if HSB isn't shown
{
HsbVisible = false;
}
else
{
VsbVisible = HsbVisible = false;
}
}
else if (vsbIsDependent)
{
if (HsbFits(w, h, false)) // HSB will fit if VSB isn't shown
{
VsbVisible = false;
}
else
{
HsbVisible = VsbVisible = false;
}
}
else if (VsbFits(w, h, false)) // VSB will fit if HSB isn't shown
{
HsbVisible = false;
}
else // HsbFits(w, h, false) // HSB will fit if VSB isn't shown
{
VsbVisible = false;
}
}
}
else if (HsbVisible && !HsbFits(w, h, true)) // just trying to show HSB, but it doesn't fit
{
HsbVisible = false;
}
else if (VsbVisible && !VsbFits(w, h, true)) // just trying to show VSB, but it doesn't fit
{
VsbVisible = false;
}
// Reset the Viewport's width,height to account for the visible scrollbars, unless
// the Viewport's size was explicitly set, then we just use that.
if (null == explicitViewportW) // || 0 == explicitViewportW) // TODO: 0? // if (null == explicitViewportW)
{
viewportW = w - ((VsbVisible) ? (minViewportInset + VsbRequiredWidth()) : (minViewportInset * 2));
}
else
{
viewportW = explicitViewportW;
}
if (null == explicitViewportH) // || 0 == explicitViewportH) // TODO: 0? // if (null == explicitViewportH)
{
viewportH = h - ((HsbVisible) ? (minViewportInset + HsbRequiredHeight()) : (minViewportInset * 2));
}
else
{
viewportH = explicitViewportH;
}
// Layout the Viewport and scrollbars.
if (null != viewport)
{
//Debug.Log("Setting Viewport size: " + viewportW + ", " + viewportH);
LayoutUtil.SetLayoutBoundsSize((InvalidationManagerClient)viewport, viewportW, viewportH); //null, null); // 20131026
//Debug.Log("Setting Viewport position: " + minViewportInset + ", " + minViewportInset);
LayoutUtil.SetLayoutBoundsPosition((InvalidationManagerClient)viewport, minViewportInset, minViewportInset);
// TODO: examine why this doesn't work without going explicit!
//((Component)viewport).Width = (float)viewportW; //TEMP
//((Component) viewport).Height = (float) viewportH; //TEMP
//((Component)viewport).Transform.Apply();
}
if (HsbVisible)
{
float hsbW = (VsbVisible) ? w - LayoutUtil.GetPreferredBoundsWidth(vsb) : w;
float hsbH = LayoutUtil.GetPreferredBoundsHeight(hsb);
LayoutUtil.SetLayoutBoundsSize(hsb, Math.Max(LayoutUtil.GetMinBoundsWidth(hsb), hsbW), hsbH);
LayoutUtil.SetLayoutBoundsPosition(hsb, 0, h - hsbH);
}
if (VsbVisible)
{
float vsbW = LayoutUtil.GetPreferredBoundsWidth(vsb);
float vsbH = (HsbVisible) ? h - LayoutUtil.GetPreferredBoundsHeight(hsb) : h;
LayoutUtil.SetLayoutBoundsSize(vsb, vsbW, Math.Max(LayoutUtil.GetMinBoundsHeight(vsb), vsbH));
LayoutUtil.SetLayoutBoundsPosition(vsb, w - vsbW, 0);
}
// If we've added an auto scrollbar, then the measured size is likely to have been wrong.
// There's a risk of looping here, so we count.
if ((_invalidationCount < 2) && (((VsbVisible != oldShowVSB) && vAuto) || ((HsbVisible != oldShowHSB) && hAuto)))
{
Target.InvalidateSize();
// If the Viewport's layout is virtual, it's possible that its
// measured size changed as a consequence of laying it out,
// so we invalidate its size as well.
GroupBase viewportGroup = viewport as GroupBase;
//if (null != viewportGroup && null != viewportGroup.Layout && viewportGroup.Layout.UseVirtualLayout)
// viewportGroup.InvalidateSize();
_invalidationCount += 1;
}
else
{
_invalidationCount = 0;
}
Target.SetContentSize(w, h);
}
