工具提示控件被设计为在鼠标遇到它所绑定的元素的大致位置弹出,并且无法响应移动事件。下面是一个自定义工具提示示例。我添加了背景和 z-index,以便 TextBlock 出现在图像上。与鼠标位置的偏移使工具提示远离鼠标光标,从而使移动动画流畅。
XAML:
<UserControl x:Class="ImageEditor.TestControl"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Width="800" Height="800">
<Canvas x:Name="MainCanvas">
<Border x:Name="tt" Background="Gray" Visibility="Collapsed" Canvas.ZIndex="10">
<TextBlock x:Name="txtTooltip" Width="90" Height="20" Text="This is a tooltip" ></TextBlock>
</Border>
<Image x:Name="theImage" Source="images/image.jpg" Width="300" MouseEnter="theImage_MouseEnter"
MouseMove="theImage_MouseMove" MouseLeave="theImage_MouseLeave">
</Image>
</Canvas>
</UserControl>
代码:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
namespace ImageEditor
{
public partial class TestControl : UserControl
{
private bool _tooltipVisible = false;
public TestControl()
{
InitializeComponent();
}
private void theImage_MouseMove(object sender, MouseEventArgs e)
{
if (_tooltipVisible)
{
tt.SetValue(Canvas.TopProperty, e.GetPosition(theImage).Y - (5 + txtTooltip.Height));
tt.SetValue(Canvas.LeftProperty, e.GetPosition(theImage).X - 5);
}
}
private void theImage_MouseEnter(object sender, MouseEventArgs e)
{
_tooltipVisible = true;
tt.Visibility = Visibility.Visible;
}
private void theImage_MouseLeave(object sender, MouseEventArgs e)
{
_tooltipVisible = false;
tt.Visibility = Visibility.Collapsed;
}
}
}