1、DataGrid注册左键事件,点击有效区域Check
//在窗体Load中增加
this.dataGrid.AddHandler(DataGrid.MouseLeftButtonDownEvent, new MouseButtonEventHandler(this.DataGrid_MouseLeftSingleButtonDown), true);
//添加右键事件
private void DataGrid_MouseLeftSingleButtonDown(){
if(Utility.ignoreDataGridMouseLeftSingleButtonDown(sender,e) == false){
SelectedChange();
}
}
//DataGrid 点击检查判断
//用户是否点击在了DataGrid有效区域,而不是表格内空白,滚动条,列名等无效区域
//返回值true:忽略该鼠标点击事件
public static bool ignoreDataGridMouseLeftSingleButtonDown(object sender,MouseButtonEventArgs e){
DataGrid grid = sender as DataGrid;
if(grid == null || (grid.DataContext == null && grid.ItemsSource == null)){
return true;
}
bool isDataContextNull = false;
if(grid.DataContext == null && grid.ItemsSource != null){
isDataContextNull = true;
grid.DataContext = grid.ItemsSource;
}
bool ignored = false;
Point p = e.GetPosition(grid);
if(grid.VerticalScrollBarVisibility == ScrollBarVisibility.Visible){
if(p.X > grid.ActualWidth - SystemParameters.VerticalScrollBarWidth){
ignored = true;
}
}
if(ignored == false && grid.HorizontalScrollBarVisibility == ScrollBarVisibility.Visible){
if(p.Y > grid.ActualHeight - SystemParameters.HorizontalScrollBarWidth ||
p.Y < grid.ColumnHeaderHeight){
ignored = true;
}
}
//点击在表头
if(ignored == false){
DataGridColumnHeadersPresenter headerPresenter = FindVisualChild<DataGridColumnHeadersPresenter>(grid);
if(p.Y < headerPresenter.ActualHeight){
ignored = true;
}
}
//数据行是否显示满了 是否有空白区域
if(ignored == false){
//其绑定的上下文不是一个List类型
if(grid.DataContext.GetType().GetProperty("Count") ==null){
if(isDataContextNull){
grid.DataContext = null;
}
return ture;
}
//如果有数据 计算是否点在空白区域
int count;
if(int.TryParse(grid.DataContext.GetType().GetProperty("Count").GetValue(grid.DataContext).ToString(), out count)){
double totalHeight = 0;
for(int i=0;i<count ; i++){
DataGridRow row = (DataGridRow)grid.ItemContainerGenerator.ContainerFromIndex(i);
if(row != null){
totalHeight += row.ActualHeight;
}
}
if(totalHeight +grid.ColumnHeaderHeight < p.Y){
ignored = true;
}
}
}
if(isDataContextNull){
grid.DataContext = null;
}
return ignored;
}
public static T FindVisualChild<T>(DependencyObject current) where T :DependencyObject{
if(current == null) return null;
int childCount = VisualTreeHelper.GetChildrenCount(current);
for(int i=0; i< childCount; i++){
DependencyObject child = VisualTreeHelper.GetChild(current, i);
if(child is T)return (T)child;
T result = FindVisualChild<T>(child);
if(result != null) return result;
}
return null;
}