WPF 鼠标拖拽平移

效果

xaml

<ScrollViewer x:Name="scrollViewer" HorizontalScrollBarVisibility="Hidden" VerticalScrollBarVisibility="Disabled" Background="#FFF1ADAD"
                     PreviewMouseDown="ScrollViewer_OnPreviewMouseDown"
                     PreviewMouseMove="ScrollViewer_OnPreviewMouseMove"
                     PreviewMouseUp="ScrollViewer_OnPreviewMouseUp" 
                      >

            <StackPanel x:Name="stackPanel" Orientation="Horizontal" HorizontalAlignment="Left">
                <Button Width="240" Height="100" Margin="10" Click="ButtonBase_OnClick" />
                <Button Width="240" Height="100" Margin="10" Click="ButtonBase_OnClick"/>
                <Button Width="240" Height="100" Margin="10" Click="ButtonBase_OnClick"/>
                <Button Width="240" Height="100" Margin="10" Click="ButtonBase_OnClick"/>
                <Button Width="240" Height="100" Margin="10" Click="ButtonBase_OnClick"/>
                <Button Width="240" Height="100" Margin="10" Click="ButtonBase_OnClick"/>
                <Button Width="240" Height="100" Margin="10" Click="ButtonBase_OnClick"/>
                <Button Width="240" Height="100" Margin="10" Click="ButtonBase_OnClick"/>
                <Button Width="240" Height="100" Margin="10" Click="ButtonBase_OnClick"/>
                <Button Width="240" Height="100" Margin="10" Click="ButtonBase_OnClick"/>
                <Button Width="240" Height="100" Margin="10" Click="ButtonBase_OnClick"/>
            </StackPanel>
        </ScrollViewer>

 代码

 Point initialMousePoint = new();
        double horizontalOffset = 1;
        bool isMouseDown = false;
        private double mouseDist = 0;

        private void ScrollViewer_OnPreviewMouseDown(object sender, MouseButtonEventArgs e) { 
            initialMousePoint = e.GetPosition(scrollViewer);
            horizontalOffset = scrollViewer.HorizontalOffset;
            isMouseDown = true;
            e.Handled = false;
        }

        private void ScrollViewer_OnPreviewMouseMove(object sender, MouseEventArgs e) {
            if (isMouseDown && e.LeftButton == MouseButtonState.Pressed) { 
                scrollViewer.ScrollToHorizontalOffset(horizontalOffset + (initialMousePoint.X - e.GetPosition(scrollViewer).X)); 
            }
            e.Handled = false;
        }

        private void ScrollViewer_OnPreviewMouseUp(object sender, MouseButtonEventArgs e) {
            isMouseDown = false;
            e.Handled = false; 
            mouseDist = (e.GetPosition(scrollViewer) - initialMousePoint).Length; 
        }

        private void ButtonBase_OnClick(object sender, RoutedEventArgs e) { 
            if (mouseDist < 1) { 
                if (sender is Button btn) {
                    btn.Content = DateTime.Now.Millisecond.ToString();
                }
            }
        }