private int CountToNext()
{
bool expanded = is_expanded;
is_expanded = false;
OpenTreeNodeEnumerator walk = new OpenTreeNodeEnumerator(this);
TreeNode next = null;
if (walk.MoveNext() && walk.MoveNext())
{
next = walk.CurrentNode;
}
is_expanded = expanded;
walk.Reset();
walk.MoveNext();
int count = 0;
while (walk.MoveNext() && walk.CurrentNode != next)
{
count++;
}
return(count);
}
private void RemoveAt(int index, bool update)
{
TreeNode removed = nodes [index];
TreeNode prev = GetPrevNode(removed);
TreeNode new_selected = null;
bool re_set_selected = false;
bool visible = removed.IsVisible;
TreeView tree_view = TreeView;
if (tree_view != null)
{
tree_view.RecalculateVisibleOrder(prev);
if (removed == tree_view.SelectedNode)
{
if (removed.IsExpanded)
{
removed.Collapse(); // Fix Xamarin Bugzilla 5010.
}
re_set_selected = true;
OpenTreeNodeEnumerator oe = new OpenTreeNodeEnumerator(removed);
if (oe.MoveNext() && oe.MoveNext())
{
new_selected = oe.CurrentNode;
}
else
{
oe = new OpenTreeNodeEnumerator(removed);
oe.MovePrevious();
new_selected = oe.CurrentNode == removed ? null : oe.CurrentNode;
}
}
}
Array.Copy(nodes, index + 1, nodes, index, count - index - 1);
count--;
nodes[count] = null;
if (nodes.Length > OrigSize && nodes.Length > (count * 2))
{
Shrink();
}
if (tree_view != null && re_set_selected)
{
tree_view.SelectedNode = new_selected;
}
TreeNode parent = removed.parent;
removed.parent = null;
if (update && tree_view != null && visible)
{
tree_view.RecalculateVisibleOrder(prev);
tree_view.UpdateScrollBars(false);
tree_view.UpdateBelow(parent);
}
OnUIACollectionChanged(CollectionChangeAction.Remove, removed);
}
protected override void OnKeyDown (KeyEventArgs e)
{
OpenTreeNodeEnumerator ne;
switch (e.KeyData & Keys.KeyCode) {
case Keys.Add:
if (selected_node != null && selected_node.IsExpanded)
selected_node.Expand ();
break;
case Keys.Subtract:
if (selected_node != null && selected_node.IsExpanded)
selected_node.Collapse ();
break;
case Keys.Left:
if (selected_node != null) {
if (selected_node.IsExpanded && selected_node.Nodes.Count > 0)
selected_node.Collapse ();
else {
TreeNode parent = selected_node.Parent;
if (parent != null) {
selection_action = TreeViewAction.ByKeyboard;
SelectedNode = parent;
}
}
}
break;
case Keys.Right:
if (selected_node != null) {
if (!selected_node.IsExpanded)
selected_node.Expand ();
else {
TreeNode child = selected_node.FirstNode;
if (child != null)
SelectedNode = child;
}
}
break;
case Keys.Up:
if (selected_node != null) {
ne = new OpenTreeNodeEnumerator (selected_node);
if (ne.MovePrevious () && ne.MovePrevious ()) {
selection_action = TreeViewAction.ByKeyboard;
SelectedNode = ne.CurrentNode;
}
}
break;
case Keys.Down:
if (selected_node != null) {
ne = new OpenTreeNodeEnumerator (selected_node);
if (ne.MoveNext () && ne.MoveNext ()) {
selection_action = TreeViewAction.ByKeyboard;
SelectedNode = ne.CurrentNode;
}
}
break;
case Keys.Home:
if (root_node.Nodes.Count > 0) {
ne = new OpenTreeNodeEnumerator (root_node.Nodes [0]);
if (ne.MoveNext ()) {
selection_action = TreeViewAction.ByKeyboard;
SelectedNode = ne.CurrentNode;
}
}
break;
case Keys.End:
if (root_node.Nodes.Count > 0) {
ne = new OpenTreeNodeEnumerator (root_node.Nodes [0]);
while (ne.MoveNext ())
{ }
selection_action = TreeViewAction.ByKeyboard;
SelectedNode = ne.CurrentNode;
}
break;
case Keys.PageDown:
if (selected_node != null) {
ne = new OpenTreeNodeEnumerator (selected_node);
int move = VisibleCount;
for (int i = 0; i < move && ne.MoveNext (); i++) {
}
selection_action = TreeViewAction.ByKeyboard;
SelectedNode = ne.CurrentNode;
}
break;
case Keys.PageUp:
if (selected_node != null) {
ne = new OpenTreeNodeEnumerator (selected_node);
int move = VisibleCount;
for (int i = 0; i < move && ne.MovePrevious (); i++)
{ }
selection_action = TreeViewAction.ByKeyboard;
SelectedNode = ne.CurrentNode;
}
break;
case Keys.Multiply:
if (selected_node != null)
selected_node.ExpandAll ();
break;
}
base.OnKeyDown (e);
if (!e.Handled && checkboxes &&
selected_node != null &&
(e.KeyData & Keys.KeyCode) == Keys.Space) {
selected_node.check_reason = TreeViewAction.ByKeyboard;
selected_node.Checked = !selected_node.Checked;
e.Handled = true;
}
}
internal void UpdateScrollBars (bool force)
{
if (!force && (IsDisposed || update_stack > 0 || !IsHandleCreated || !Visible))
return;
bool vert = false;
bool horz = false;
int height = 0;
int width = -1;
int item_height = ActualItemHeight;
if (scrollable) {
OpenTreeNodeEnumerator walk = new OpenTreeNodeEnumerator (root_node);
while (walk.MoveNext ()) {
int r = walk.CurrentNode.Bounds.Right;
if (r > width)
width = r;
height += item_height;
}
height -= item_height; // root_node adjustment
width += hbar_offset;
if (height > ClientRectangle.Height) {
vert = true;
if (width > ClientRectangle.Width - SystemInformation.VerticalScrollBarWidth)
horz = true;
} else if (width > ClientRectangle.Width) {
horz = true;
}
if (!vert && horz && height > ClientRectangle.Height - SystemInformation.HorizontalScrollBarHeight)
vert = true;
}
if (vert) {
int visible_height = horz ? ClientRectangle.Height - hbar.Height : ClientRectangle.Height;
vbar.SetValues (Math.Max (0, max_visible_order - 2), visible_height / ActualItemHeight);
/*
vbar.Maximum = max_visible_order;
vbar.LargeChange = ClientRectangle.Height / ItemHeight;
*/
if (!vbar_bounds_set) {
vbar.Bounds = new Rectangle (ClientRectangle.Width - vbar.Width, 0, vbar.Width,
ClientRectangle.Height -
(horz ? SystemInformation.VerticalScrollBarWidth : 0));
vbar_bounds_set = true;
// We need to recalc the hbar if the vbar is now visible
hbar_bounds_set = false;
}
vbar.Visible = true;
if (skipped_nodes > 0) {
int skip = Math.Min (skipped_nodes, vbar.Maximum - VisibleCount + 1);
skipped_nodes = 0;
vbar.SafeValueSet (skip);
skipped_nodes = skip;
}
} else {
skipped_nodes = 0;
RecalculateVisibleOrder (root_node);
vbar.Visible = false;
SetVScrollValue (0);
vbar_bounds_set = false;
}
if (horz) {
hbar.SetValues (width + 1, ClientRectangle.Width - (vert ? SystemInformation.VerticalScrollBarWidth : 0));
/*
hbar.LargeChange = ClientRectangle.Width;
hbar.Maximum = width + 1;
*/
if (!hbar_bounds_set) {
hbar.Bounds = new Rectangle (0, ClientRectangle.Height - hbar.Height,
ClientRectangle.Width - (vert ? SystemInformation.VerticalScrollBarWidth : 0),
hbar.Height);
hbar_bounds_set = true;
}
hbar.Visible = true;
} else {
hbar_offset = 0;
hbar.Visible = false;
hbar_bounds_set = false;
}
}
private void Draw (Rectangle clip, Graphics dc)
{
dc.FillRectangle (ThemeEngine.Current.ResPool.GetSolidBrush (BackColor), clip);
if (dash == null)
CreateDashPen ();
Rectangle viewport = ViewportRectangle;
Rectangle original_clip = clip;
if (clip.Bottom > viewport.Bottom)
clip.Height = viewport.Bottom - clip.Top;
OpenTreeNodeEnumerator walk = new OpenTreeNodeEnumerator (TopNode);
while (walk.MoveNext ()) {
TreeNode current = walk.CurrentNode;
// Haven't gotten to visible nodes yet
if (current.GetY () + ActualItemHeight < clip.Top)
continue;
// Past the visible nodes
if (current.GetY () > clip.Bottom)
break;
DrawTreeNode (current, dc, clip);
}
if (hbar.Visible && vbar.Visible) {
Rectangle corner = new Rectangle (hbar.Right, vbar.Bottom, vbar.Width, hbar.Height);
if (original_clip.IntersectsWith (corner))
dc.FillRectangle (ThemeEngine.Current.ResPool.GetSolidBrush (ThemeEngine.Current.ColorControl),
corner);
}
}
internal void RecalculateVisibleOrder (TreeNode start)
{
if (update_stack > 0)
return;
int order;
if (start == null) {
start = root_node;
order = 0;
} else
order = start.visible_order;
OpenTreeNodeEnumerator walk = new OpenTreeNodeEnumerator (start);
while (walk.MoveNext ()) {
walk.CurrentNode.visible_order = order;
order++;
}
max_visible_order = order;
}
private TreeNode GetNodeAt (int y)
{
if (nodes.Count <= 0)
return null;
OpenTreeNodeEnumerator o = new OpenTreeNodeEnumerator (TopNode);
int move = y / ActualItemHeight;
for (int i = -1; i < move; i++) {
if (!o.MoveNext ())
return null;
}
return o.CurrentNode;
}
private void RemoveAt(int index, bool update)
{
TreeNode removed = nodes [index];
TreeNode prev = GetPrevNode(removed);
TreeNode new_selected = null;
bool re_set_selected = false;
bool visible = removed.IsVisible;
TreeView tree_view = null;
if (owner != null)
{
tree_view = owner.TreeView;
}
if (tree_view != null)
{
tree_view.RecalculateVisibleOrder(prev);
if (removed == tree_view.SelectedNode)
{
re_set_selected = true;
OpenTreeNodeEnumerator oe = new OpenTreeNodeEnumerator(removed);
if (oe.MoveNext() && oe.MoveNext())
{
new_selected = oe.CurrentNode;
}
else
{
oe = new OpenTreeNodeEnumerator(removed);
oe.MovePrevious();
new_selected = oe.CurrentNode == removed ? null : oe.CurrentNode;
}
}
}
Array.Copy(nodes, index + 1, nodes, index, count - index - 1);
count--;
nodes[count] = null;
if (nodes.Length > OrigSize && nodes.Length > (count * 2))
{
Shrink();
}
if (tree_view != null && re_set_selected)
{
tree_view.SelectedNode = new_selected;
}
TreeNode parent = removed.parent;
removed.parent = null;
if (update && tree_view != null && visible)
{
tree_view.RecalculateVisibleOrder(prev);
tree_view.UpdateScrollBars(false);
tree_view.UpdateBelow(parent);
}
#if NET_2_0
// UIA Framework Event: Collection Changed
if (tree_view != null)
{
tree_view.OnUIACollectionChanged(owner, new CollectionChangeEventArgs(CollectionChangeAction.Remove, removed));
}
#endif
}
private int CountToNext ()
{
bool expanded = is_expanded;
is_expanded = false;
OpenTreeNodeEnumerator walk = new OpenTreeNodeEnumerator (this);
TreeNode next= null;
if (walk.MoveNext () && walk.MoveNext ())
next = walk.CurrentNode;
is_expanded = expanded;
walk.Reset ();
walk.MoveNext ();
int count = 0;
while (walk.MoveNext () && walk.CurrentNode != next)
count++;
return count;
}
private void RemoveAt (int index, bool update)
{
TreeNode removed = nodes [index];
TreeNode prev = GetPrevNode (removed);
TreeNode new_selected = null;
bool re_set_selected = false;
bool visible = removed.IsVisible;
TreeView tree_view = null;
if (owner != null)
tree_view = owner.TreeView;
if (tree_view != null) {
tree_view.RecalculateVisibleOrder (prev);
if (removed == tree_view.SelectedNode) {
re_set_selected = true;
OpenTreeNodeEnumerator oe = new OpenTreeNodeEnumerator (removed);
if (oe.MoveNext () && oe.MoveNext ()) {
new_selected = oe.CurrentNode;
} else {
oe = new OpenTreeNodeEnumerator (removed);
oe.MovePrevious ();
new_selected = oe.CurrentNode == removed ? null : oe.CurrentNode;
}
}
}
Array.Copy (nodes, index + 1, nodes, index, count - index - 1);
count--;
nodes[count] = null;
if (nodes.Length > OrigSize && nodes.Length > (count * 2))
Shrink ();
if (tree_view != null && re_set_selected) {
tree_view.SelectedNode = new_selected;
}
TreeNode parent = removed.parent;
removed.parent = null;
if (update && tree_view != null && visible) {
tree_view.RecalculateVisibleOrder (prev);
tree_view.UpdateScrollBars (false);
tree_view.UpdateBelow (parent);
}
#if NET_2_0
// UIA Framework Event: Collection Changed
if (tree_view != null)
tree_view.OnUIACollectionChanged (owner, new CollectionChangeEventArgs (CollectionChangeAction.Remove, removed));
#endif
}