/// <summary>Attaches a view to this view group.</summary>
/// <remarks>
/// Attaches a view to this view group. Attaching a view assigns this group as the parent,
/// sets the layout parameters and puts the view in the list of children so it can be retrieved
/// by calling
/// <see cref="getChildAt(int)">getChildAt(int)</see>
/// .
/// This method should be called only for view which were detached from their parent.
/// </remarks>
/// <param name="child">the child to attach</param>
/// <param name="index">the index at which the child should be attached</param>
/// <param name="params">the layout parameters of the child</param>
/// <seealso cref="removeDetachedView(View, bool)">removeDetachedView(View, bool)</seealso>
/// <seealso cref="detachAllViewsFromParent()">detachAllViewsFromParent()</seealso>
/// <seealso cref="detachViewFromParent(View)">detachViewFromParent(View)</seealso>
/// <seealso cref="detachViewFromParent(int)">detachViewFromParent(int)</seealso>
protected internal virtual void attachViewToParent(android.view.View child, int index
, android.view.ViewGroup.LayoutParams @params)
{
child.mLayoutParams = @params;
if (index < 0)
{
index = mChildrenCount;
}
addInArray(child, index);
child.mParent = this;
child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK & ~DRAWING_CACHE_VALID)
| DRAWN | INVALIDATED;
this.mPrivateFlags |= INVALIDATED;
if (child.hasFocus())
{
requestChildFocus(child, child.findFocus());
}
}
private void addViewInner(android.view.View child, int index, android.view.ViewGroup
.LayoutParams @params, bool preventRequestLayout)
{
if (mTransition != null)
{
// Don't prevent other add transitions from completing, but cancel remove
// transitions to let them complete the process before we add to the container
mTransition.cancel(android.animation.LayoutTransition.DISAPPEARING);
}
if (child.getParent() != null)
{
throw new System.InvalidOperationException("The specified child already has a parent. "
+ "You must call removeView() on the child's parent first.");
}
if (mTransition != null)
{
mTransition.addChild(this, child);
}
if (!checkLayoutParams(@params))
{
@params = generateLayoutParams(@params);
}
if (preventRequestLayout)
{
child.mLayoutParams = @params;
}
else
{
child.setLayoutParams(@params);
}
if (index < 0)
{
index = mChildrenCount;
}
addInArray(child, index);
// tell our children
if (preventRequestLayout)
{
child.assignParent(this);
}
else
{
child.mParent = this;
}
if (child.hasFocus())
{
requestChildFocus(child, child.findFocus());
}
android.view.View.AttachInfo ai = mAttachInfo;
if (ai != null && (mGroupFlags & FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW) == 0)
{
bool lastKeepOn = ai.mKeepScreenOn;
ai.mKeepScreenOn = false;
child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags & VISIBILITY_MASK));
if (ai.mKeepScreenOn)
{
needGlobalAttributesUpdate(true);
}
ai.mKeepScreenOn = lastKeepOn;
}
onViewAdded(child);
if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE)
{
mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE;
}
}
