private void ResetNavigation()
{
if (BundleRuntime.Instance.State == BundleRuntimeState.Stopping)
{
return;
}
Action resetNavigation = () =>
{ // 重新初始化TreeView
SkinUserControl = new Settings();
WelcomeControl = new Introduction();
LayoutDockPanel.Children.Clear();
ContentQueue.Clear();
OpenedPagesCache.Clear();
HideSidebar();
SideBars.Clear();
SideBarSettings.Clear();
TreeViewItemSelectionQueue.Clear();
TopTreeViewItemNavigationNodeTuples.Clear();
NavigationTreeView.Items.Clear();
InitializeNavigationTreeView();
if (BundleActivator.PermissionServiceTracker.IsServiceAvailable)
{
SetCurrentUser(BundleActivator.PermissionServiceTracker.DefaultOrFirstService.CurrentUserName);
}
ShowContent(WelcomeControl);
};
Dispatcher.Invoke(resetNavigation); // 由界面代理线程来执行UI更新。
}
/// <summary>
/// 关闭当前用户控件。
/// </summary>
public void CloseCurrentContent()
{
if (ContentQueue.Count < 2)
{
return;
}
bool confirm = ConfigurationService.Get(BundleActivator.Bundle, "ConfirmClosingWindow", true);
if (confirm && ModernDialog.ShowMessage(
"你确实是否要关闭当前窗口？",
"关闭窗口",
MessageBoxButton.YesNo) != MessageBoxResult.Yes)
{
return;
}
HideSidebar();
// 删除当前显示的控件，即最后一个
var content = ContentQueue[ContentQueue.Count - 1];
ContentQueue.Remove(content);
// 删除缓存
var key = string.Empty;
foreach (var pair in OpenedPagesCache)
{
if (pair.Value.Equals(content))
{
key = pair.Key;
}
}
if (!string.IsNullOrEmpty(key))
{
OpenedPagesCache.Remove(key);
}
// 从容器中删除该控件
LayoutDockPanel.Children.Remove(content);
// 显示倒数第二个用户控件
ShowContent(ContentQueue[ContentQueue.Count - 1]);
if (TreeViewItemSelectionQueue.Count > 0) // 设置当前节点选中状态为false，并且删除其选中队列
{
(TreeViewItemSelectionQueue[TreeViewItemSelectionQueue.Count - 1] as TreeViewItem).IsSelected = false;
TreeViewItemSelectionQueue.RemoveAt(TreeViewItemSelectionQueue.Count - 1);
}
if (TreeViewItemSelectionQueue.Count > 0) // 选中前一个节点
{
(TreeViewItemSelectionQueue[TreeViewItemSelectionQueue.Count - 1] as TreeViewItem).IsSelected = true;
}
}
/// <summary>
/// 树点击事件。
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void NavigationTreeView_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs <object> e)
{
var treeViewItem = e.NewValue;
if (treeViewItem == null || !(treeViewItem is TreeViewItem))
{
return;
}
HideSidebar();
// 跟踪树形节点选中队列，保持刚选中的项为最后一项
TreeViewItemSelectionQueue.Remove(treeViewItem);
TreeViewItemSelectionQueue.Add(treeViewItem);
// 如果是换肤节点，则显示换肤控件
if (treeViewItem == SkinTreeViewItem)
{
ShowContent(SkinUserControl);
return;
}
var node = (treeViewItem as TreeViewItem).Tag as NavigationNode;
if (!string.IsNullOrEmpty(node.Value))
{
if (OpenedPagesCache.ContainsKey(node.Id))
{
ShowContent(OpenedPagesCache[node.Id]);
return;
}
LoadingTextBlock.Visibility = System.Windows.Visibility.Visible;
LayoutDockPanel.Visibility = System.Windows.Visibility.Hidden;
ThreadPool.QueueUserWorkItem(state =>
{
Action action = () =>
{
bool cached = false;
// 缓存中是否存在当前打开的页面，如果有，直接显示
// 获取该树节点的Tag属性，其值为导航节点
// 加载导航节点定义的用户控件的类型，这个类型由插件提供。
// 因此，必须使用插件来加载类型。
if (!cached)
{
var contentClass = node.Bundle.LoadClass(node.Value);
if (contentClass != null)
{
try
{
// 创建实例，并转换成用户控件。
var component = System.Activator.CreateInstance(contentClass);
var userControl = component as UserControl;
if (userControl == null)
{
FileLogUtility.Error(string.Format("The type '{0}' in the Bundle '{1}' does not inherit from UIElement.", node.Value, node.Bundle.SymbolicName));
return;
}
if (userControl.DataContext != null && userControl.DataContext is ListViewModelBase)
{
userControl.InputBindings.AddRange((userControl.DataContext as ListViewModelBase).InputKeyBindings);
}
// 添加到缓存
OpenedPagesCache[node.Id] = userControl;
// 将动态创建控件添加到显示区域
ShowContent(userControl);
}
catch (Exception ex)
{
FileLogUtility.Error(string.Format("Failed to create UIElement for the type '{0}' in the Bundle '{1}'.", node.Value, node.Bundle.SymbolicName));
FileLogUtility.Error(ex);
}
}
else
{
FileLogUtility.Error(string.Format("Failed to load class '{0}' from the Bundle '{1}'.", node.Value, node.Bundle.SymbolicName));
}
}
LoadingTextBlock.Visibility = System.Windows.Visibility.Hidden;
LayoutDockPanel.Visibility = System.Windows.Visibility.Visible;
};
DispatcherOperation op = Dispatcher.BeginInvoke(
DispatcherPriority.Background,
action);
DispatcherOperationStatus status = op.Status;
while (status != DispatcherOperationStatus.Completed)
{
status = op.Wait(TimeSpan.FromMilliseconds(1000));
if (status == DispatcherOperationStatus.Aborted)
{
// Alert Someone
}
}
});
}
}