WPF学习之路（九）导航链接

Hyperlink

WPF中超链接类型是Hyperlink，除了能在页面之间导航，还能再同一个页面下进行段落导航

实例：

<Grid>
    <FlowDocumentReader>
        <FlowDocument>
            <Section LineHeight="25" FontSize="15">
                <List>
                    <ListItem>
                        <Paragraph>
                            <Hyperlink NavigateUri="CustomPage.xaml#first">
                                First Paragraph
                            </Hyperlink>
                        </Paragraph>
                    </ListItem>
                    <ListItem>
                        <Paragraph>
                            <Hyperlink NavigateUri="CustomPage.xaml#second">
                                Second Paragraph
                            </Hyperlink>
                        </Paragraph>
                    </ListItem>
                </List>
            </Section>
            <Paragraph x:Name="first" FontSize="20" Background="AliceBlue">
                1. First paragraph content
            </Paragraph>
            <Paragraph x:Name="second" FontSize="20" Background="AliceBlue">
                2. Second paragraph content
            </Paragraph>
            <Paragraph>
                <Hyperlink NavigateUri="SimplePage.xaml" >
                    Hello WPF
                </Hyperlink>
            </Paragraph>
        </FlowDocument>
    </FlowDocumentReader>
</Grid>

如果页面寄宿窗口不是NavigationWindow，超链接是无法导航的

通过编写代码导航 

在某些情况下Hyperlink不能实现，需要通过NavigationService来实现

1.导航需要传值

2.导航到页面之前要设置属性

3.运行时才知道要导航到哪个页面

实例：

DemoPage.xaml

<Page.Resources>
    <Style TargetType="TextBlock">
        <Setter Property="FontSize" Value="15" />
        <Setter Property="Margin" Value="5" />
    </Style>
</Page.Resources>
<StackPanel>
    <TextBlock>
        Navigate to 
        <Hyperlink x:Name="link1" Click="link_click">
            SimplePage.xaml
        </Hyperlink>
    </TextBlock>
    <TextBlock>
        Navigate to 
        <Hyperlink x:Name="link2" Click="link_click">
            SimplePage.xaml
        </Hyperlink>
        (Call a constructor with parameter)
    </TextBlock>
    <TextBlock>
        Navigate to 
        <Hyperlink x:Name="link3" Click="link_click">
            .Net Object
        </Hyperlink>
    </TextBlock>
    <TextBlock>
        Navigate to site
        <Hyperlink x:Name="link4" Click="link_click">
            http://www.bing.com
        </Hyperlink>
    </TextBlock>
</StackPanel>

class Person
{
    public string Name { get; set; }
    public int Age { get; set; }

    public override string ToString()
    {
        return "Name: " + Name + "
Age: " + Age;
    }
}

Page.xaml.cs

private void link_click(object sender, RoutedEventArgs e)
{
    Hyperlink link = sender as Hyperlink;
    if (link == link1)
    {
        NavigationService.Navigate(new Uri("pack://application:,,,/SimplePage.xaml"));
    }
    else if (link == link2)
    {
        NavigationService.Navigate(new SimplePage("Hello Navigation"));
    }else if (link == link3)
    {
        NavigationService.Navigate(new Person() { Name = "Alex", Age = 25 });
    }
    else if (link == link4)
    {
        NavigationService.Navigate(new Uri("http://www.bing.com"));
    }
}

其他导航方式

 导航工具栏

 导航命令

添加Button控制导航，相当于自定义导航工具栏

<Button Height="50" Width="100" Content="Back" Command="NavigationCommands.BrowseBack" />
<Button Height="50" Width="100" Content="Forward" Command="NavigationCommands.BrowseForward" />

 历史记录

 WPF中Jaurnal记录了每一次导航操作，从而实现导航工具栏的功能

Journal 包含两个数据栈用来记录前进和后退页面的显示状态，每个相关 Page 都会对应一个 JournalEntry。日志状态自动恢复仅对单击导航条上前进后退按钮有效。

To be continue...