private bool showPlusMinus(ThreeStateTreeNode threeStateNode)
{
bool showPlusMinus = this.ShowPlusMinus;
if (threeStateNode != null)
{
showPlusMinus &= threeStateNode.ShowPlusMinus;
}
return(showPlusMinus);
}
private void CheckNodes(TreeNode node, CheckState state)
{
ThreeStateTreeNode tstn = node as ThreeStateTreeNode;
if (tstn != null && tstn.HasCheckBox)
{
tstn.CheckState = state;
tstn.Checked = !tstn.Checked; //TODO
}
foreach (TreeNode n in node.Nodes)
{
CheckNodes(n, state);
}
}
private void SetNextState(TreeNode node)
{
ThreeStateTreeNode tstn = node as ThreeStateTreeNode;
if (tstn != null)
{
tstn.CheckState = GetNextState(tstn.CheckState);
}
node.Checked = !node.Checked;
TreeViewEventArgs args = new TreeViewEventArgs(node);
this.OnAfterCheck(args);
}
private void CountNodes(TreeNode node, ref int countChecked, ref int countUncheckd, ref int countNodes)
{
ThreeStateTreeNode tstn = node as ThreeStateTreeNode;
if (tstn != null && tstn.HasCheckBox)
{
countNodes++;
if (tstn.CheckState == CheckState.Checked)
{
countChecked++;
}
else if (tstn.CheckState == CheckState.Unchecked)
{
countUncheckd++;
}
}
foreach (TreeNode n in node.Nodes)
{
CountNodes(n, ref countChecked, ref countUncheckd, ref countNodes);
}
}
private void ThreeStateTreeView_DrawNode(object sender, DrawTreeNodeEventArgs e)
{
ThreeStateTreeNode threeStateNode = e.Node as ThreeStateTreeNode;
// farben für den text einstellen
Brush brush;
Brush brushBackground;
if ((e.State & TreeNodeStates.Selected) == TreeNodeStates.Selected)
{
brush = SystemBrushes.HighlightText;
brushBackground = SystemBrushes.Highlight;
}
else
{
brush = SystemBrushes.ControlText;
brushBackground = SystemBrushes.ControlLightLight;
}
// den platz für das node festlegen
Rectangle nodeRect = new Rectangle(e.Bounds.Location, e.Bounds.Size);
// je nach level nach rechts einrücken
nodeRect.X += this.Indent * threeStateNode.Level;
nodeRect.Width -= this.Indent * threeStateNode.Level;
// plus minus malen
if (showPlusMinus(threeStateNode))
{
if (e.Node.Nodes.Count > 0)
{
Image img;
if (threeStateNode.IsExpanded)
{
img = this.images.Images[0];
}
else
{
img = this.images.Images[1];
}
e.Graphics.DrawImageUnscaled(img, nodeRect);
}
nodeRect.X += this.plusMinusWidth;
nodeRect.Width -= this.plusMinusWidth;
}
// checkbox malen
if (threeStateNode != null && threeStateNode.HasCheckBox)
{
System.Windows.Forms.VisualStyles.CheckBoxState state;
if (threeStateNode.CheckState == CheckState.Checked)
{
state = System.Windows.Forms.VisualStyles.CheckBoxState.CheckedNormal;
}
else if (threeStateNode.CheckState == CheckState.Unchecked)
{
state = System.Windows.Forms.VisualStyles.CheckBoxState.UncheckedNormal;
}
else
{
state = System.Windows.Forms.VisualStyles.CheckBoxState.MixedNormal;
}
CheckBoxRenderer.DrawCheckBox(e.Graphics, new Point(nodeRect.X, nodeRect.Y + 2), state);
Size s = CheckBoxRenderer.GetGlyphSize(e.Graphics, state);
nodeRect.X += this.checkBoxWidth;
nodeRect.Width -= this.checkBoxWidth;
}
// hintergrund malen
Rectangle rec = new Rectangle(nodeRect.X, nodeRect.Y, nodeRect.Width, nodeRect.Height);
e.Graphics.FillRectangle(brushBackground, rec);
Font f;
if (threeStateNode != null && threeStateNode.Bold)
{
f = new Font(this.Font, FontStyle.Bold);
}
else
{
f = this.Font;
}
// text malen
Rectangle recText = new Rectangle(nodeRect.X + 1, nodeRect.Y + 1, nodeRect.Width, nodeRect.Height);
e.Graphics.DrawString(e.Node.Text,
f,
brush,
recText,
new StringFormat(StringFormatFlags.NoWrap));
}