鼠标按钮事件......简单的问题 [英] mouse button events...simple question

问题描述

好的，我一直在自己编程，所以我可以尝试使用C＃，我正在使用silverlight来完成它。 MSDN库吹出了Java。我印象非常深刻。我有一些代码，我不知道为什么它不起作用。我没有错误或
任何东西，它看起来像我和阅读库100％正确。因此，由于我遇到了C＃silverlight差异，我认为可能就是这样。也许有人可以提供帮助。 

 scrollview.MouseLeftButtonDown + = new MouseButtonEventHandler（scrollview_MouseLeftButtonDown）; 
 scrollview.MouseLeftButtonUp + = new MouseButtonEventHandler（scrollview_MouseLeftButtonUp）; 
 
} 
 
 void scrollview_MouseLeftButtonUp（object sender，MouseButtonEventArgs e）
 {
 posAfter = e.GetPosition（scrollview）; 
 double dX = posAfter.X  -  posBefore.X; 
 double dY = posAfter.Y  -  posBefore.Y; 
 scrollview.ScrollToHorizo​​ntalOffset（scrollview.Horizo​​ntalOffset  -  dX）; 
 scrollview.ScrollToVerticalOffset（scrollview.VerticalOffset  -  dY）; 
} 
 
 void scrollview_MouseLeftButtonDown（object sender，MouseButtonEventArgs e）
 {
 posBefore = e.GetPosition（scrollview）; 
} 

我在这里只展示了两个操作。我把它放得非常简单，我只是想尝试使用功能并使其正确。我有一个滚动查看器，我希望鼠标移动来调整偏移量，使其显示为拖动功能。现在
我知道这是一个非常洞穴的人，但我只是想让它工作或了解它为什么不能正常运作。 

我的代码再编译好了没有使用：visual studio 2010 ulitimate

silverlight 5

再次没有错误!!所以所有的名字都在代码中。 

解决方案

伙计，我不知道你有什么样的内容，但我们假设这是一个带有图像的网格。

XAML：

<网格x：名称=" LayoutRoot"> 
 
< ScrollViewer x：Name =" svScrollViewer" VerticalScrollBarVisibility = QUOT;自动" Horizo​​ntalScrollBarVisibility = QUOT;自动"填充= QUOT; 0"> 
 
< Grid 
 MouseLeftButtonDown =" Grid_MouseLeftButtonDown_1" 
 MouseMove =" Grid_MouseMove_1" 
 MouseLeftButtonUp =" Grid_MouseLeftButtonUp_1" 
背景="白色>> 
< Image Source =" http：//wallpapers.free-review.net/wallpapers/23/Frosty_snow_storm_Windows_7_backgrounds.jpg"余量= QUOT; 80 QUOT; /> 
< / Grid> 
 
< / ScrollViewer> 
 
< / Grid> 

C＃：

私人布尔拖延; 
 private Point posBefore; 
 private Point posAfter; 
 
 private void Grid_MouseLeftButtonDown_1（object sender，MouseButtonEventArgs e）
 {
 draging = true; 
 svScrollViewer.Cursor = Cursors.Hand; 
 posBefore = e.GetPosition（svScrollViewer）; 
} 
 
 private void Grid_MouseLeftButtonUp_1（object sender，MouseButtonEventArgs e）
 {
 draging = false; 
 svScrollViewer.Cursor = Cursors.Arrow; 
} 
 
 private void Grid_MouseMove_1（对象发送者，MouseEventArgs e）
 {
 if（draging）
 {
 posAfter = e.GetPosition （svScrollViewer）; 
 double dX = posAfter.X  -  posBefore.X; 
 double dY = posAfter.Y  -  posBefore.Y; 
 svScrollViewer.ScrollToHorizo​​ntalOffset（svScrollViewer.Horizo​​ntalOffset  -  dX）; 
 svScrollViewer.ScrollToVerticalOffset（svScrollViewer.VerticalOffset  -  dY）; 
 posBefore = e.GetPosition（svScrollViewer）; 
} 
} 

这里，ScrollViewer不会触发事件，是内容。

如果您想使用其他控件而不是网格，请不要忘记设置背景。如果您没有设置背景，则事件不会触发。

Ok I have been programming on my own so I can try to get the hang of C# and I am using silverlight to do it. The MSDN libraries BLOW Java out of the water. I am very impressed. I have some code that I have NO clue why it will not work. I have no errors or anything and it looks to me and from reading the libraries to be 100% correct. So since I have run into C# silverlight differences I am assume it could be that. Maybe someone here could help. 

        scrollview.MouseLeftButtonDown += new MouseButtonEventHandler(scrollview_MouseLeftButtonDown);
        scrollview.MouseLeftButtonUp += new MouseButtonEventHandler(scrollview_MouseLeftButtonUp);

    }

    void scrollview_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
    {
        posAfter = e.GetPosition(scrollview);
        double dX = posAfter.X - posBefore.X;
        double dY = posAfter.Y - posBefore.Y;
        scrollview.ScrollToHorizontalOffset(scrollview.HorizontalOffset - dX);
        scrollview.ScrollToVerticalOffset(scrollview.VerticalOffset - dY);
    }

    void scrollview_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
    {
        posBefore = e.GetPosition(scrollview);
    }

I have show you just two operations here. I have put it put pretty simply, again I am just trying to get use to the functionality and get it right. I have a scrollviewer that I want mouse movement to adjust the offset so it appears as a drag feature. now I know this is pretty cave man like but i just want to get it to work or learn why it does not function properly. 

again my code compiles fine no problem. 

Using: visual studio 2010 ulitimate

silverlight 5

again NO errors!! so all names are right in the code. 

解决方案

Hi man, I don't know what kind of content do you have, but let's suppose that is a Grid with an Image.

XAML:

    <Grid x:Name="LayoutRoot">

        <ScrollViewer x:Name="svScrollViewer" VerticalScrollBarVisibility="Auto" HorizontalScrollBarVisibility="Auto" Padding="0">
            
<Grid
MouseLeftButtonDown="Grid_MouseLeftButtonDown_1"
MouseMove="Grid_MouseMove_1"
MouseLeftButtonUp="Grid_MouseLeftButtonUp_1"
Background="White">
                <Image Source="http://wallpapers.free-review.net/wallpapers/23/Frosty_snow_storm_Windows_7_backgrounds.jpg" Margin="80"/>
            </Grid>

        </ScrollViewer>

    </Grid>

C#:

        private bool draging;
        private Point posBefore;
        private Point posAfter;

        private void Grid_MouseLeftButtonDown_1(object sender, MouseButtonEventArgs e)
        {
            draging = true;
            svScrollViewer.Cursor = Cursors.Hand;
            posBefore = e.GetPosition(svScrollViewer);
        }

        private void Grid_MouseLeftButtonUp_1(object sender, MouseButtonEventArgs e)
        {
            draging = false;
            svScrollViewer.Cursor = Cursors.Arrow;
        }

        private void Grid_MouseMove_1(object sender, MouseEventArgs e)
        {
            if (draging)
            {
                posAfter = e.GetPosition(svScrollViewer);
                double dX = posAfter.X - posBefore.X;
                double dY = posAfter.Y - posBefore.Y;
                svScrollViewer.ScrollToHorizontalOffset(svScrollViewer.HorizontalOffset - dX);
                svScrollViewer.ScrollToVerticalOffset(svScrollViewer.VerticalOffset - dY);
                posBefore = e.GetPosition(svScrollViewer);
            }
        }

Here, the ScrollViewer doesn't fire the event, is the content.

If you want to use other control instead of the Grid, don't forget to set a Background. If you don't set a Background the event doesn't fire.

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