如何使鼠标滚轮更改背景图像 [英] How to get mouse wheel to change the background image
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问题描述
我正在创建一个UserControl
,我希望它具有的一种行为是,当用户在其上旋转鼠标滚轮时,背景图像会在两个选项之间交替显示.
I am creating a UserControl
and one behaviour I want it to have is that when the user rotates the mouse wheel over it then the background image alternates between two options.
到目前为止,我有:
<UserControl x:Class="OI.MR.UserControls.DataControls.ScrollWheel"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
mc:Ignorable="d"
d:DesignHeight="400" d:DesignWidth="118">
<UserControl.Background>
<ImageBrush ImageSource="dial1.png" TileMode="None" />
</UserControl.Background>
<UserControl.InputBindings>
<MouseBinding MouseAction="WheelClick" Command="{Binding ScrollTheWheel}"/>
</UserControl.InputBindings>
</UserControl>
和
public partial class ScrollWheel : UserControl
{
private bool _isDial1 = true;
public ScrollWheel()
{
InitializeComponent();
}
private ICommand _scrollTheWheel;
public ICommand ScrollTheWheel
{
get
{
if(_scrollTheWheel == null)
{
_scrollTheWheel = new DelegateCommand(_ => SwitchImage(), _ => true);
}
return _scrollTheWheel;
}
}
private void SwitchImage()
{
if(_isDial1)
{
(Background as ImageBrush).ImageSource = new BitmapImage(new Uri("dial2.png"));
_isDial1 = false;
}
else
{
(Background as ImageBrush).ImageSource = new BitmapImage(new Uri("dial1.png"));
_isDial1 = true;
}
}
}
但是,转动轮子不会改变背景图像.如何更改图像?
However turning the wheel is not changing the background image. How can I get the image to change?
推荐答案
您的数据上下文确实不正确: 一种可能性:
your datacontext is really not correct: One possibility:
<UserControl.InputBindings>
<MouseBinding MouseAction="WheelClick"
Command="{Binding Path=ScrollTheWheel, RelativeSource={RelativeSource AncestorType={x:Type view:YourUserControl}}}"/>
</UserControl.InputBindings>
(用用户控件的类型替换类型)
(replace the type with the type of your user control)
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