//
// System.ComponentModel.Design.SelectionService
//
// Authors:
// Ivan N. Zlatev (contact i-nZ.net)
//
// (C) 2006-2007 Ivan N. Zlatev
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Collections;
using System.ComponentModel;
using System.ComponentModel.Design;
using System.Windows.Forms;
namespace System.ComponentModel.Design{
internal class SelectionService : ISelectionService
{
private IServiceProvider _serviceProvider;
private ArrayList _selection;
private IComponent _primarySelection;
public SelectionService (IServiceProvider provider)
{
_serviceProvider = provider;
_selection = new ArrayList();
IComponentChangeService changeService = provider.GetService (typeof (IComponentChangeService)) as IComponentChangeService;
if (changeService != null)
changeService.ComponentRemoving += new ComponentEventHandler (OnComponentRemoving);
}
private void OnComponentRemoving (object sender, ComponentEventArgs args)
{
if (this.GetComponentSelected (args.Component))
#if NET_2_0
this.SetSelectedComponents (new IComponent[] { args.Component }, SelectionTypes.Remove);
#else
this.SetSelectedComponents (new IComponent[] { this.RootComponent }, SelectionTypes.Click);
#endif
}
public event EventHandler SelectionChanging;
public event EventHandler SelectionChanged;
public ICollection GetSelectedComponents()
{
if (_selection != null)
return _selection.ToArray ();
return new object[0];
}
protected virtual void OnSelectionChanging ()
{
if (SelectionChanging != null)
SelectionChanging (this, EventArgs.Empty);
}
protected virtual void OnSelectionChanged ()
{
if (SelectionChanged != null)
SelectionChanged (this, EventArgs.Empty);
}
public object PrimarySelection {
get { return _primarySelection; }
}
public int SelectionCount {
get {
if (_selection != null)
return _selection.Count;
return 0;
}
}
private IComponent RootComponent {
get {
if (_serviceProvider != null) {
IDesignerHost designerHost = _serviceProvider.GetService (typeof (IDesignerHost)) as IDesignerHost;
if (designerHost != null)
return designerHost.RootComponent;
}
return null;
}
}
public bool GetComponentSelected (object component)
{
if (_selection != null)
return _selection.Contains (component);
return false;
}
public void SetSelectedComponents (ICollection components)
{
#if NET_2_0
SetSelectedComponents (components, SelectionTypes.Auto);
#else
SetSelectedComponents (components, SelectionTypes.Normal);
#endif
}
// If the array is a null reference or does not contain any components,
// SetSelectedComponents selects the top-level component in the designer.
//
public void SetSelectedComponents (ICollection components, SelectionTypes selectionType)
{
bool primary, add, remove, replace, toggle, auto;
primary = add = remove = replace = toggle = auto = false;
OnSelectionChanging ();
if (_selection == null)
throw new InvalidOperationException("_selection == null");
if (components == null || components.Count == 0) {
components = new ArrayList ();
((ArrayList) components).Add (this.RootComponent);
selectionType = SelectionTypes.Replace;
}
if (!Enum.IsDefined (typeof (SelectionTypes), selectionType)) {
#if NET_2_0
selectionType = SelectionTypes.Auto;
#else
selectionType = SelectionTypes.Normal;
#endif
}
#if NET_2_0
auto = ((selectionType & SelectionTypes.Auto) == SelectionTypes.Auto);
#else
if ((selectionType & SelectionTypes.Normal) == SelectionTypes.Normal ||
(selectionType & SelectionTypes.MouseDown) == SelectionTypes.MouseDown ||
(selectionType & SelectionTypes.MouseUp) == SelectionTypes.MouseUp) {
auto = true;
}
#endif
if (auto) {
if ((((Control.ModifierKeys & Keys.Control) == Keys.Control) || ((Control.ModifierKeys & Keys.Shift) == Keys.Shift))) {
toggle = true;
}
else if (components.Count == 1) {
object component = null;
foreach (object c in components) {
component = c;
break;
}
if (this.GetComponentSelected (component))
primary = true;
else
replace = true;
}
else {
replace = true;
}
}
else {
#if NET_2_0
primary = ((selectionType & SelectionTypes.Primary) == SelectionTypes.Primary);
add = ((selectionType & SelectionTypes.Add) == SelectionTypes.Add);
remove = ((selectionType & SelectionTypes.Remove) == SelectionTypes.Remove);
toggle = ((selectionType & SelectionTypes.Toggle) == SelectionTypes.Toggle);
#else
primary = ((selectionType & SelectionTypes.Click) == SelectionTypes.Click);
#endif
replace = ((selectionType & SelectionTypes.Replace) == SelectionTypes.Replace);
}
if (replace) {
_selection.Clear ();
add = true;
}
if (add) {
foreach (object component in components) {
if (component is IComponent && !_selection.Contains (component)) {
_selection.Add (component);
_primarySelection = (IComponent) component;
}
}
}
if (remove) {
bool rootRemoved = false;
foreach (object component in components) {
if (component is IComponent && _selection.Contains (component))
_selection.Remove (component);
if (component == this.RootComponent)
rootRemoved = true;
}
if (_selection.Count == 0) {
if (rootRemoved) {
_primarySelection = null;
} else {
_primarySelection = this.RootComponent;
_selection.Add (this.RootComponent);
}
}
}
if (toggle) {
foreach (object component in components) {
if (component is IComponent) {
if (_selection.Contains (component)) {
_selection.Remove (component);
if (component == _primarySelection)
_primarySelection = this.RootComponent;
}
else {
_selection.Add (component);
_primarySelection = (IComponent) component;
}
}
}
}
if (primary) {
object primarySelection = null;
foreach (object component in components) {
primarySelection = component;
break;
}
if (!this.GetComponentSelected (primarySelection))
_selection.Add (primarySelection);
_primarySelection = (IComponent) primarySelection;
}
OnSelectionChanged ();
}
}
}
|