/// <summary>
/// Toggles the expanded/collapsed state of the specified tree item.
/// This will raise the EventSubtreeExpanded or EventSubtreeCollapsed
/// events based on the current item's state.
/// </summary>
/// <param name="item"></param>
public void ToggleSubtree(TreeViewItemRenderingState item)
{
if (d_itemModel == null)
{
return;
}
item.d_subtreeIsExpanded = !item.d_subtreeIsExpanded;
var args = new ItemViewEventArgs(this, d_itemModel.MakeIndex(item.d_childId, item.d_parentIndex));
if (item.d_subtreeIsExpanded)
{
ComputeRenderedChildrenForItem(item, d_itemModel.MakeIndex(item.d_childId, item.d_parentIndex), ref d_renderedMaxWidth, ref d_renderedTotalHeight);
OnSubtreeExpanded(args);
}
else
{
ClearItemRenderedChildren(item, ref d_renderedTotalHeight);
OnSubtreeCollapsed(args);
}
UpdateScrollbars();
// we need just a simple invalidation. No need to redo the render state
// as we modified it ourself directly.
Invalidate(false);
}
public override void PrepareForRender()
{
base.PrepareForRender();
//TODO: better way of ignoring the null item model? E.g.: warn? Throw an exception?
if (d_itemModel == null || !IsDirty())
{
return;
}
if (d_needsFullRender)
{
var rootIndex = d_itemModel.GetRootIndex();
d_renderedMaxWidth = 0;
d_renderedTotalHeight = 0;
d_rootItemState = new TreeViewItemRenderingState(this)
{
// root item isn't a proper item so it does not have a nested level.
d_nestedLevel = -1,
d_subtreeIsExpanded = true
};
ComputeRenderedChildrenForItem(d_rootItemState, rootIndex, ref d_renderedMaxWidth, ref d_renderedTotalHeight);
}
else
{
UpdateRenderingStateForItem(d_rootItemState, ref d_renderedMaxWidth, ref d_renderedTotalHeight);
}
UpdateScrollbars();
SetIsDirty(false);
d_needsFullRender = false;
}
public TreeView(string type, string name)
: base(type, name)
{
d_rootItemState = new TreeViewItemRenderingState(this);
d_subtreeExpanderMargin = DefaultSubtreeExpanderMargin;
AddTreeViewProperties();
}
private void HandleSelectionAction(TreeViewItemRenderingState item, bool togglesExpander)
{
if (!togglesExpander)
{
return;
}
ToggleSubtree(item);
}
private void ClearItemRenderedChildren(TreeViewItemRenderingState item, ref float renderedTotalHeight)
{
foreach (var itor in item.d_children)
{
ClearItemRenderedChildren(itor, ref renderedTotalHeight);
// ??? d_renderedTotalHeight -= item.d_size.d_height;
renderedTotalHeight -= item.d_size.Height;
}
item.d_children.Clear();
item.SortChildren();
}
private void UpdateRenderingStateForItem(TreeViewItemRenderingState item, ref float renderedMaxWidth, ref float renderedTotalHeight)
{
// subtract the previous height
renderedTotalHeight -= item.d_size.Height;
FillRenderingState(item, d_itemModel.MakeIndex(item.d_childId, item.d_parentIndex), ref renderedMaxWidth, ref renderedTotalHeight);
foreach (var itor in item.d_children)
{
itor.d_nestedLevel = item.d_nestedLevel + 1;
UpdateRenderingStateForItem(itor, ref renderedMaxWidth, ref renderedTotalHeight);
}
}
private TreeViewItemRenderingState ComputeRenderingStateForIndex(ModelIndex parentIndex, int childId, int nestedLevel, ref float renderedMaxWidth, ref float renderedTotalHeight)
{
var index = d_itemModel.MakeIndex(childId, parentIndex);
var state = new TreeViewItemRenderingState(this)
{
d_nestedLevel = nestedLevel,
d_parentIndex = parentIndex,
d_childId = childId
};
FillRenderingState(state, index, ref renderedMaxWidth, ref renderedTotalHeight);
ComputeRenderedChildrenForItem(state, index, ref renderedMaxWidth, ref renderedTotalHeight);
return(state);
}
public void ExpandSubtreeRecursive(TreeViewItemRenderingState item)
{
if (!item.d_subtreeIsExpanded)
{
ToggleSubtree(item);
}
if (item.d_totalChildCount == 0)
{
return;
}
foreach (var itor in item.d_children)
{
ExpandSubtreeRecursive(itor);
}
}
private void FillRenderingState(TreeViewItemRenderingState item, ModelIndex index, ref float renderedMaxWidth, ref float renderedTotalHeight)
{
var text = d_itemModel.GetData(index);
var renderedString = GetRenderedStringParser().Parse(text, GetFont(), d_textColourRect);
item.d_string = renderedString;
item.d_text = text;
item.d_icon = d_itemModel.GetData(index, ItemDataRole.IDR_Icon);
item.d_size = new Sizef(renderedString.GetHorizontalExtent(this),
renderedString.GetVerticalExtent(this));
float indent = GetViewRenderer().GetSubtreeExpanderXIndent(item.d_nestedLevel) + GetViewRenderer().GetSubtreeExpanderSize().Width;
renderedMaxWidth = Math.Max(renderedMaxWidth, item.d_size.Width + indent);
renderedTotalHeight += item.d_size.Height;
item.d_isSelected = IsIndexSelected(index);
}
private void ComputeRenderedChildrenForItem(TreeViewItemRenderingState item, ModelIndex index,
ref float renderedMaxWidth, ref float renderedTotalHeight)
{
var childCount = d_itemModel.GetChildCount(index);
item.d_totalChildCount = childCount;
if (!item.d_subtreeIsExpanded)
{
return;
}
for (var child = 0; child < childCount; ++child)
{
item.d_children.Add(ComputeRenderingStateForIndex(index, child, item.d_nestedLevel + 1, ref renderedMaxWidth, ref renderedTotalHeight));
}
item.SortChildren();
}
private ModelIndex IndexAtRecursive(TreeViewItemRenderingState item, ref float curHeight,
Lunatics.Mathematics.Vector2 windowPosition, ref bool handled,
Action <TreeViewItemRenderingState, bool> action)
{
var nextHeight = curHeight + item.d_size.Height;
if (windowPosition.Y >= curHeight &&
windowPosition.Y <= nextHeight)
{
handled = true;
var expanderWidth = GetViewRenderer().GetSubtreeExpanderSize().Width;
var baseX = GetViewRenderer().GetSubtreeExpanderXIndent(item.d_nestedLevel);
baseX -= GetHorzScrollbar().GetScrollPosition();
if (windowPosition.X >= baseX &&
windowPosition.X <= baseX + expanderWidth)
{
action(item, true);
return(new ModelIndex());
}
action(item, false);
return(new ModelIndex(d_itemModel.MakeIndex(item.d_childId, item.d_parentIndex)));
}
curHeight = nextHeight;
for (var i = 0; i < item.d_renderedChildren.Count; ++i)
{
var index = IndexAtRecursive(item.d_renderedChildren[i], ref curHeight, windowPosition, ref handled, action);
if (handled)
{
return(index);
}
}
return(new ModelIndex());
}
private void NoopAction(TreeViewItemRenderingState item, bool togglesExpander)
{
}