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using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
namespace Aga.Controls.Tree
{
internal class NormalInputState : InputState
{
private bool _mouseDownFlag = false;
public NormalInputState(TreeViewAdv tree) : base(tree)
{
}
public override void KeyDown(KeyEventArgs args)
{
if (Tree.CurrentNode == null && Tree.Root.Nodes.Count > 0)
Tree.CurrentNode = Tree.Root.Nodes[0];
if (Tree.CurrentNode != null)
{
switch (args.KeyCode)
{
case Keys.Right:
if (!Tree.CurrentNode.IsExpanded)
Tree.CurrentNode.IsExpanded = true;
else if (Tree.CurrentNode.Nodes.Count > 0)
Tree.SelectedNode = Tree.CurrentNode.Nodes[0];
args.Handled = true;
break;
case Keys.Left:
if (Tree.CurrentNode.IsExpanded)
Tree.CurrentNode.IsExpanded = false;
else if (Tree.CurrentNode.Parent != Tree.Root)
Tree.SelectedNode = Tree.CurrentNode.Parent;
args.Handled = true;
break;
case Keys.Down:
NavigateForward(1);
args.Handled = true;
break;
case Keys.Up:
NavigateBackward(1);
args.Handled = true;
break;
case Keys.PageDown:
NavigateForward(Math.Max(1, Tree.CurrentPageSize - 1));
args.Handled = true;
break;
case Keys.PageUp:
NavigateBackward(Math.Max(1, Tree.CurrentPageSize - 1));
args.Handled = true;
break;
case Keys.Home:
if (Tree.RowMap.Count > 0)
FocusRow(Tree.RowMap[0]);
args.Handled = true;
break;
case Keys.End:
if (Tree.RowMap.Count > 0)
FocusRow(Tree.RowMap[Tree.RowMap.Count-1]);
args.Handled = true;
break;
case Keys.Subtract:
Tree.CurrentNode.Collapse();
args.Handled = true;
args.SuppressKeyPress = true;
break;
case Keys.Add:
Tree.CurrentNode.Expand();
args.Handled = true;
args.SuppressKeyPress = true;
break;
case Keys.Multiply:
Tree.CurrentNode.ExpandAll();
args.Handled = true;
args.SuppressKeyPress = true;
break;
}
}
}
public override void MouseDown(TreeNodeAdvMouseEventArgs args)
{
if (args.Node != null)
{
Tree.ItemDragMode = true;
Tree.ItemDragStart = args.Location;
if (args.Button == MouseButtons.Left || args.Button == MouseButtons.Right)
{
Tree.BeginUpdate();
try
{
Tree.CurrentNode = args.Node;
if (args.Node.IsSelected)
_mouseDownFlag = true;
else
{
_mouseDownFlag = false;
DoMouseOperation(args);
}
}
finally
{
Tree.EndUpdate();
}
}
}
else
{
Tree.ItemDragMode = false;
MouseDownAtEmptySpace(args);
}
}
public override void MouseUp(TreeNodeAdvMouseEventArgs args)
{
Tree.ItemDragMode = false;
if (_mouseDownFlag)
{
if (args.Button == MouseButtons.Left)
DoMouseOperation(args);
else if (args.Button == MouseButtons.Right)
Tree.CurrentNode = args.Node;
}
_mouseDownFlag = false;
}
private void NavigateBackward(int n)
{
int row = Math.Max(Tree.CurrentNode.Row - n, 0);
if (row != Tree.CurrentNode.Row)
FocusRow(Tree.RowMap[row]);
}
private void NavigateForward(int n)
{
int row = Math.Min(Tree.CurrentNode.Row + n, Tree.RowCount - 1);
if (row != Tree.CurrentNode.Row)
FocusRow(Tree.RowMap[row]);
}
protected virtual void MouseDownAtEmptySpace(TreeNodeAdvMouseEventArgs args)
{
Tree.ClearSelectionInternal();
}
protected virtual void FocusRow(TreeNodeAdv node)
{
Tree.SuspendSelectionEvent = true;
try
{
Tree.ClearSelectionInternal();
Tree.CurrentNode = node;
Tree.SelectionStart = node;
node.IsSelected = true;
Tree.ScrollTo(node);
}
finally
{
Tree.SuspendSelectionEvent = false;
}
}
protected bool CanSelect(TreeNodeAdv node)
{
if (Tree.SelectionMode == TreeSelectionMode.MultiSameParent)
{
return (Tree.SelectionStart == null || node.Parent == Tree.SelectionStart.Parent);
}
else
return true;
}
protected virtual void DoMouseOperation(TreeNodeAdvMouseEventArgs args)
{
Tree.SuspendSelectionEvent = true;
try
{
Tree.ClearSelectionInternal();
if (args.Node != null)
args.Node.IsSelected = true;
Tree.SelectionStart = args.Node;
}
finally
{
Tree.SuspendSelectionEvent = false;
}
}
}
}
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Philip is a Software Architect with severaly years of experience. He studied business IT in the University of Wedel, Germany, and has reached his Masters degree in 2010. Back in 2002, he started his so far best-known software PDFCreator. The second developer joined two years later and since then, both constantly improve this piece of open source software.