// Virtual so clients can override header behavior and rendering entirely
public virtual void OnGUI(Rect rect, float xScroll)
{
Event evt = Event.current;
if (m_GUIView == null)
{
m_GUIView = GUIView.current;
}
DetectSizeChanges(rect);
if (m_ResizeToFit && evt.type == EventType.Repaint)
{
m_ResizeToFit = false;
ResizeColumnsWidthsProportionally(rect.width - GUI.skin.verticalScrollbar.fixedWidth - state.widthOfAllVisibleColumns);
}
// We create a guiclip to let the header be able to scroll horizontally according to the tree view's horizontal scroll
// If the tree view is inside a UI Toolkit scroll view, however, we don't need the x scroll offset.
Vector2 scrollOffset = Vector2.zero;
var container = UIElementsUtility.GetCurrentIMGUIContainer();
var uiScrollView = container?.GetFirstAncestorOfType <ScrollView>();
if (uiScrollView == null)
{
scrollOffset = new Vector2(-xScroll, 0f);
}
GUIClip.Push(rect, scrollOffset, Vector2.zero, false);
{
Rect localRect = new Rect(0, 0, rect.width, rect.height);
m_TotalHeaderRect = localRect;
// Background ( We always add the width of the vertical scrollbar to accommodate if this is being shown below e.g by a tree view)
float widthOfAllColumns = state.widthOfAllVisibleColumns;
float backgroundWidth = (localRect.width > widthOfAllColumns ? localRect.width : widthOfAllColumns) + GUI.skin.verticalScrollbar.fixedWidth;
Rect backgroundRect = new Rect(0, 0, backgroundWidth, localRect.height);
GUI.Label(backgroundRect, GUIContent.none, DefaultStyles.background);
// Update column rects (cached for clients to have fast access to column rects by using GetCellRect)
UpdateColumnHeaderRects(localRect);
// Columns
for (int v = 0; v < state.visibleColumns.Length; v++)
{
currentColumnIndex = state.visibleColumns[v];
MultiColumnHeaderState.Column column = state.columns[currentColumnIndex];
Rect headerRect = m_ColumnRects[v];
const float limitHeightOfDivider = 4f;
Rect dividerRect = new Rect(headerRect.xMax - 1, headerRect.y + limitHeightOfDivider, 1f, headerRect.height - 2 * limitHeightOfDivider);
// Context menu
if (evt.type == EventType.ContextClick && headerRect.Contains(evt.mousePosition))
{
evt.Use();
DoContextMenu();
}
// Resize columns logic
Rect dragRect = new Rect(dividerRect.x - m_DividerWidth * 0.5f, localRect.y, m_DividerWidth, localRect.height);
bool hasControl;
var newColumnWidth = EditorGUI.WidthResizer(dragRect, column.width, column.minWidth, column.maxWidth, out hasControl);
if (column.width != newColumnWidth)
{
column.width = newColumnWidth;
columnSettingsChanged?.Invoke(currentColumnIndex);
}
if (hasControl && evt.type == EventType.Repaint)
{
DrawColumnResizing(headerRect, column);
}
// Draw divider (can be overridden)
DrawDivider(dividerRect, column);
// Draw header (can be overridden)
ColumnHeaderGUI(column, headerRect, currentColumnIndex);
}
currentColumnIndex = -1;
// Context menu when clicked outside of a column header
if (evt.type == EventType.ContextClick && backgroundRect.Contains(evt.mousePosition))
{
evt.Use();
DoContextMenu();
}
}
GUIClip.Pop();
}
