private void OnComponentRemoving(object sender, ComponentEventArgs e)
{
// If our workspace is being removed
if (e.Component == _workspace)
{
// Prevent layout being performed during removal of children otherwise the layout
// code will cause the controls to be added back before they are actually destroyed
_workspace.SuspendLayout();
// Need access to host in order to delete a component
IDesignerHost host = (IDesignerHost)GetService(typeof(IDesignerHost));
// We need to remove all children from the workspace
for (int i = _workspace.Root.Children.Count - 1; i >= 0; i--)
{
Component comp = _workspace.Root.Children[i] as Component;
// If the component is a control...
if (comp is Control)
{
// We need to manually remove it from the workspace controls collection
KryptonReadOnlyControls readOnlyControls = (KryptonReadOnlyControls)_workspace.Controls;
readOnlyControls.RemoveInternal(comp as Control);
}
host.DestroyComponent(comp);
// Must remove the child after it has been destroyed otherwise the component destroy method
// will not be able to climb the sequence chain to find the parent workspace instance
_workspace.Root.Children.Remove(comp);
}
_workspace.ResumeLayout();
}
}
private void OnComponentRemoving(object sender, ComponentEventArgs e)
{
// If our sequence is being removed
if (e.Component == _sequence)
{
// Need access to host in order to delete a component
IDesignerHost host = (IDesignerHost)GetService(typeof(IDesignerHost));
// Climb the workspace item tree to get the top most sequence
KryptonWorkspace workspace = null;
IWorkspaceItem workspaceItem = _sequence;
while (workspaceItem.WorkspaceParent != null)
{
workspaceItem = workspaceItem.WorkspaceParent;
}
// Grab the workspace control that contains the top most sequence
if ((workspaceItem != null) && (workspaceItem is KryptonWorkspaceSequence))
{
KryptonWorkspaceSequence sequence = (KryptonWorkspaceSequence)workspaceItem;
workspace = sequence.WorkspaceControl;
}
// We need to remove all children from the sequence
for (int j = _sequence.Children.Count - 1; j >= 0; j--)
{
Component comp = _sequence.Children[j] as Component;
// If the component is a control...
if ((comp is Control) && (workspace != null))
{
// We need to manually remove it from the workspace controls collection
KryptonReadOnlyControls readOnlyControls = (KryptonReadOnlyControls)workspace.Controls;
readOnlyControls.RemoveInternal(comp as Control);
}
host.DestroyComponent(comp);
// Must remove the child after it has been destroyed otherwise the component destroy method
// will not be able to climb the sequence chain to find the parent workspace instance
_sequence.Children.Remove(comp);
}
}
}
/// <summary>
/// Clean up any resources being used.
/// </summary>
/// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
protected override void Dispose(bool disposing)
{
try
{
// Must unhook to prevent memory leak
_events = false;
Pages.Cleared -= OnPagesChanged;
Pages.Removed -= OnPagesChanged;
Pages.Inserted -= OnPagesChanged;
// Must remove from parent workspace manually because the control collection is readonly
if (Parent != null)
{
KryptonReadOnlyControls controls = (KryptonReadOnlyControls)Parent.Controls;
controls.RemoveInternal(this);
}
base.Dispose(disposing);
}
catch { }
}
