在WPF中,是否存在可用于确定TabControl
选定选项卡更改时间的事件?标准WPF选项卡控件中是否存在“选定选项卡已更改事件”
我尝试过使用TabControl.SelectionChanged
,但是当标签中的孩子的选择发生变化时,它会被多次触发。
在WPF中,是否存在可用于确定TabControl
选定选项卡更改时间的事件?标准WPF选项卡控件中是否存在“选定选项卡已更改事件”
我尝试过使用TabControl.SelectionChanged
,但是当标签中的孩子的选择发生变化时,它会被多次触发。
我在处理此挂钩,使其工作:
void TabControl_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
if (e.Source is TabControl)
{
//do work when tab is changed
}
}
您仍然可以使用该事件。只需检查发件人参数是否是您真正关心的控件,如果是,请运行事件代码。
这是正确的事件。也许它没有正确连接?
<TabControl SelectionChanged="TabControl_SelectionChanged">
<TabItem Header="One"/>
<TabItem Header="2"/>
<TabItem Header="Three"/>
</TabControl>
在代码隐藏
....
private void TabControl_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
int i = 34;
}
如果我设置了I = 34行设置一个断点,它只有当我更改选项卡断,即使标签子元素和一个他们被选中。
生成的事件冒泡,直到它被处理。
下面此XAML部触发ui_Tab_Changed
ui_A_Changed
后当在TabControl
在ListView
变化选择,无论TabItem
变化的项。
<TabControl SelectionChanged="ui_Tab_Changed">
<TabItem>
<ListView SelectionChanged="ui_A_Changed" />
</TabItem>
<TabItem>
<ListView SelectionChanged="ui_B_Changed" />
</TabItem>
</TabControl>
我们需要消耗事件ui_A_Changed
(和ui_B_Changed
,等等):如果你的x:Name
属性设置为每个TabItem
作为
private void ui_A_Changed(object sender, SelectionChangedEventArgs e) {
// do what you need to do
...
// then consume the event
e.Handled = true;
}
:
<TabControl x:Name="MyTab" SelectionChanged="TabControl_SelectionChanged">
<TabItem x:Name="MyTabItem1" Header="One"/>
<TabItem x:Name="MyTabItem2" Header="2"/>
<TabItem x:Name="MyTabItem3" Header="Three"/>
</TabControl>
然后您可以在事件中访问每个TabItem
:
private void TabControl_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
if (MyTabItem1.IsSelected)
// do your stuff
if (MyTabItem2.IsSelected)
// do your stuff
if (MyTabItem3.IsSelected)
// do your stuff
}
此代码似乎工作:
private void TabControl_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
TabItem selectedTab = e.AddedItems[0] as TabItem; // Gets selected tab
if (selectedTab.Name == "Tab1")
{
// Do work Tab1
}
else if (selectedTab.Name == "Tab2")
{
// Do work Tab2
}
}
如果你只是想有一个事件当选择一个标签,这是正确的做法:
<TabControl>
<TabItem Selector.Selected="OnTabSelected" />
<TabItem Selector.Selected="OnTabSelected" />
<TabItem Selector.Selected="OnTabSelected" />
<!-- You can also catch the unselected event -->
<TabItem Selector.Unselected="OnTabUnSelected" />
</TabControl>
并在代码
private void OnTabSelected(object sender, RoutedEventArgs e)
{
var tab = sender as TabItem;
if (tab != null)
{
// this tab is selected!
}
}
不幸的是一样好就像这个看起来一样,我没有在xaml中获得Selected属性,只是IsSelected。抱歉。 – PHenry 2014-03-28 21:05:38
如果有人使用WPF现代用户界面,他们不能使用OnTabSelected事件,但他们可以使用SelectedSourceChanged事件。
这样
<mui:ModernTab Layout="Tab" SelectedSourceChanged="ModernTab_SelectedSourceChanged" Background="Blue" AllowDrop="True" Name="tabcontroller" >
C#代码是
private void ModernTab_SelectedSourceChanged(object sender, SourceEventArgs e)
{
var links = ((ModernTab)sender).Links;
var link = this.tabcontroller.Links.FirstOrDefault(l => l.Source == e.Source);
if (link != null) {
var index = this.tabcontroller.Links.IndexOf(link);
MessageBox.Show(index.ToString());
}
}
如果你使用MVVM模式则是不方便的(并打破模式)使用事件处理程序。相反,您可以将每个单独的TabItem的Selector.IsSelected
属性绑定到viewmodel中的依赖项属性,然后处理PropertyChanged
事件处理程序。通过这种方式,您可以确切知道基于PropertyName
选择/取消选择哪个选项卡,并且每个选项卡都有一个特殊处理程序。
例子:MainView.xaml
<TabControl>
<TabItem Header="My tab 1" Selector.IsSelected="{Binding IsMyTab1Selected}"> ... </TabItem>
<TabItem Header="My tab 2" Selector.IsSelected="{Binding IsMyTab2Selected}"> ... </TabItem>
</TabControl>
例子:MainViewModel.cs
public bool IsMyTab1Selected {
get { return (bool)GetValue(IsMyTab1SelectedProperty); }
set { SetValue(IsMyTab1SelectedProperty, value); }
}
public static readonly DependencyProperty IsMyTab1SelectedProperty =
DependencyProperty.Register("IsMyTab1Selected", typeof(bool), typeof(MainViewModel), new PropertyMetadata(true, new PropertyChangedCallback(MyPropertyChanged)));
public bool IsMyTab2Selected {
get { return (bool)GetValue(IsMyTab2SelectedProperty); }
set { SetValue(IsMyTab2SelectedProperty, value); }
}
public static readonly DependencyProperty IsMyTab2SelectedProperty =
DependencyProperty.Register("IsMyTab2Selected", typeof(bool), typeof(MainViewModel), new PropertyMetadata(false, new PropertyChangedCallback(MyPropertyChanged)));
private void MyPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) {
if (e.Property.Name == "IsMyTab1Selected") {
// stuff to do
} else if (e.Property.Name == "IsMyTab2Selected") {
// stuff to do
}
}
如果您MainViewModel
是INotifyPropertyChanged
而非DependencyObject
,然后用这个来代替:
例子:MainViewModel.cs
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged(string propertyName) {
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
public MainViewModel() {
PropertyChanged += handlePropertyChanged;
}
public bool IsMyTab1Selected {
get { return _IsMyTab1Selected ; }
set {
if (value != _IsMyTab1Selected) {
_IsMyTab1Selected = value;
OnPropertyChanged("IsMyTab1Selected ");
}
}
}
private bool _IsMyTab1Selected = false;
public bool IsMyTab2Selected {
get { return _IsMyTab2Selected ; }
set {
if (value != _IsMyTab2Selected) {
_IsMyTab2Selected = value;
OnPropertyChanged("IsMyTab2Selected ");
}
}
}
private bool _IsMyTab2Selected = false;
private void handlePropertyChanged(object sender, PropertyChangedEventArgs e) {
if (e.PropertyName == "IsMyTab1Selected") {
// stuff to do
} else if (e.PropertyName == "IsMyTab2Selected") {
// stuff to do
}
}
我认为这是行不通的,但后来我意识到我检查`sender`,而不是`e.Source` – 2013-04-30 19:46:59
或只需添加`e.Handled = TRUE`,以防止其向上冒泡 – 2013-09-04 12:43:14