/// <summary>
/// If configured, some auto-steps could be performed after a check.
/// </summary>
/// <param name="args">The <see cref="ZetaLib.Windows.Controls.TriStateCheckBoxesTreeView.TreeViewTriStateEventArgs"/> instance containing the event data.</param>
private void CheckPerformAutoStepsAfterTriStateCheck(
TreeViewTriStateEventArgs args)
{
if (args.Action == TreeViewAction.ByKeyboard ||
args.Action == TreeViewAction.ByMouse)
{
if (AutoCheckChilds)
{
if (args.CheckState == CheckState.Checked)
{
ChangeNodesCheckStates(
args.Node,
TreeViewEx.NodesCheckState.
CheckAllChilds);
}
else if (args.CheckState == CheckState.Unchecked)
{
ChangeNodesCheckStates(
args.Node,
TreeViewEx.NodesCheckState.
UncheckAllChilds);
}
}
// --
if (AutoCheckParents)
{
ChangeNodesCheckStates(
args.Node,
TreeViewEx.NodesCheckState.
UpdateParentStates);
}
}
}
/// <summary>
/// Raises the <see cref="E:AfterTriStateCheck"/> event.
/// </summary>
/// <param name="args">The <see cref="ZetaLib.Windows.Controls.TriStateCheckBoxesTreeView.TreeViewTriStateEventArgs"/> instance containing the event data.</param>
protected virtual void OnAfterTriStateCheck(
TreeViewTriStateEventArgs args)
{
if (AfterTriStateCheck != null)
{
AfterTriStateCheck(this, args);
}
CheckPerformAutoStepsAfterTriStateCheck(args);
}
/// <summary>
/// Applies the given state to the given node.
/// Raises events, too.
/// </summary>
/// <param name="node">The node.</param>
/// <param name="action">The action.</param>
/// <param name="stateImageIndex">Index of the state image.</param>
/// <param name="raiseEvents">if set to <c>true</c> [raise events].</param>
private void SetTriStateToNode(
TreeNode node,
TreeViewAction action,
int stateImageIndex,
bool raiseEvents)
{
bool canSet = true;
if (raiseEvents)
{
TreeViewCancelEventArgs args =
new TreeViewCancelEventArgs(node, false, action);
OnBeforeCheck(args);
TreeViewCancelTriStateEventArgs triArgs =
new TreeViewCancelTriStateEventArgs(
node,
args.Cancel,
action,
node.StateImageIndex,
stateImageIndex);
OnBeforeTriStateCheck(triArgs);
canSet = !triArgs.Cancel;
}
if (canSet)
{
// Actually set.
// THIS IS THE ONLY PLACE to set.
node.StateImageIndex = stateImageIndex;
if (raiseEvents)
{
TreeViewEventArgs args =
new TreeViewEventArgs(node, action);
OnAfterCheck(args);
TreeViewTriStateEventArgs triArgs =
new TreeViewTriStateEventArgs(
node,
action,
node.StateImageIndex);
OnAfterTriStateCheck(triArgs);
}
}
}
/// <summary>
/// If configured, some auto-steps could be performed after a check.
/// </summary>
/// <param name="args">The <see cref="ZetaLib.Windows.Controls.TriStateCheckBoxesTreeView.TreeViewTriStateEventArgs"/> instance containing the event data.</param>
private void CheckPerformAutoStepsAfterTriStateCheck(
TreeViewTriStateEventArgs args )
{
if ( args.Action == TreeViewAction.ByKeyboard ||
args.Action == TreeViewAction.ByMouse )
{
if ( AutoCheckChilds )
{
if ( args.CheckState == CheckState.Checked )
{
ChangeNodesCheckStates(
args.Node,
TriStateCheckBoxesTreeView.NodesCheckState.
CheckAllChilds );
}
else if ( args.CheckState == CheckState.Unchecked )
{
ChangeNodesCheckStates(
args.Node,
TriStateCheckBoxesTreeView.NodesCheckState.
UncheckAllChilds );
}
}
// --
if ( AutoCheckParents )
{
ChangeNodesCheckStates(
args.Node,
TriStateCheckBoxesTreeView.NodesCheckState.
UpdateParentStates );
}
}
}
/// <summary>
/// Raises the <see cref="E:AfterTriStateCheck"/> event.
/// </summary>
/// <param name="args">The <see cref="ZetaLib.Windows.Controls.TriStateCheckBoxesTreeView.TreeViewTriStateEventArgs"/> instance containing the event data.</param>
protected virtual void OnAfterTriStateCheck(
TreeViewTriStateEventArgs args )
{
if ( AfterTriStateCheck != null )
{
AfterTriStateCheck( this, args );
}
CheckPerformAutoStepsAfterTriStateCheck( args );
}
/// <summary>
/// Applies the given state to the given node.
/// Raises events, too.
/// </summary>
/// <param name="node">The node.</param>
/// <param name="action">The action.</param>
/// <param name="stateImageIndex">Index of the state image.</param>
/// <param name="raiseEvents">if set to <c>true</c> [raise events].</param>
private void SetTriStateToNode(
TreeNode node,
TreeViewAction action,
int stateImageIndex,
bool raiseEvents )
{
bool canSet = true;
if ( raiseEvents )
{
TreeViewCancelEventArgs args =
new TreeViewCancelEventArgs( node, false, action );
OnBeforeCheck( args );
TreeViewCancelTriStateEventArgs triArgs =
new TreeViewCancelTriStateEventArgs(
node,
args.Cancel,
action,
node.StateImageIndex,
stateImageIndex );
OnBeforeTriStateCheck( triArgs );
canSet = !triArgs.Cancel;
}
if ( canSet )
{
// Actually set.
// THIS IS THE ONLY PLACE to set.
node.StateImageIndex = stateImageIndex;
if ( raiseEvents )
{
TreeViewEventArgs args =
new TreeViewEventArgs( node, action );
OnAfterCheck( args );
TreeViewTriStateEventArgs triArgs =
new TreeViewTriStateEventArgs(
node,
action,
node.StateImageIndex );
OnAfterTriStateCheck( triArgs );
}
}
}
