protected void OnMouseDown(MouseDownEvent e)
{
if (CanStartManipulation(e))
{
VisualSplitter visualSplitter = target as VisualSplitter;
FlexDirection flexDirection = visualSplitter.style.flexDirection;
if (m_AffectedElements != null)
{
VisualElementListPool.Release(m_AffectedElements);
}
m_AffectedElements = visualSplitter.GetAffectedVisualElements();
for (int i = 0; i < m_AffectedElements.Count - 1; ++i)
{
VisualElement visualElement = m_AffectedElements[i];
Rect splitterRect = visualSplitter.GetSplitterRect(visualElement);
if (splitterRect.Contains(e.localMousePosition))
{
bool isReverse = flexDirection == FlexDirection.RowReverse || flexDirection == FlexDirection.ColumnReverse;
if (isReverse)
{
m_ActiveVisualElementIndex = i + 1;
m_NextVisualElementIndex = i;
}
else
{
m_ActiveVisualElementIndex = i;
m_NextVisualElementIndex = i + 1;
}
m_Active = true;
target.CaptureMouse();
e.StopPropagation();
}
}
}
}
protected void OnMouseMove(MouseMoveEvent e)
{
if (m_Active)
{
// These calculations should only work if flex-basis is auto.
// However, Yoga implementation of flex-basis 0 is broken and behaves much like
// flex-basis auto, so it currently works with flex-basis 0 too.
VisualSplitter visualSplitter = target as VisualSplitter;
VisualElement visualElement = m_AffectedElements[m_ActiveVisualElementIndex];
VisualElement nextVisualElement = m_AffectedElements[m_NextVisualElementIndex];
FlexDirection flexDirection = visualSplitter.style.flexDirection;
bool isVertical = flexDirection == FlexDirection.Column || flexDirection == FlexDirection.ColumnReverse;
float relativeMousePosition;
if (isVertical)
{
relativeMousePosition = (e.localMousePosition.y - visualElement.layout.yMin - visualElement.style.minHeight) /
(visualElement.layout.height + nextVisualElement.layout.height -
visualElement.style.minHeight - nextVisualElement.style.minHeight);
}
else
{
relativeMousePosition = (e.localMousePosition.x - visualElement.layout.xMin - visualElement.style.minWidth) /
(visualElement.layout.width + nextVisualElement.layout.width -
visualElement.style.minWidth - nextVisualElement.style.minWidth);
}
relativeMousePosition = Math.Max(0.0f, Math.Min(1.0f, relativeMousePosition));
float totalFlex = visualElement.style.flexGrow + nextVisualElement.style.flexGrow;
visualElement.style.flexGrow = relativeMousePosition * totalFlex;
nextVisualElement.style.flexGrow = (1.0f - relativeMousePosition) * totalFlex;
e.StopPropagation();
}
}