/// <summary>
/// Handles the mouse button being released over a column header.
/// </summary>
/// <param name="state">The thread initialization parameter.</param>
protected override void OnMouseUp(MouseButtonEventArgs e)
{
// This resets the state of the mouse for the next operation.
this.mouseState = MouseState.ButtonUp;
}
/// <summary>
/// Handles the mouse button being pressed.
/// </summary>
/// <param name="e">The event arguments.</param>
protected override void OnMouseDown(System.Windows.Input.MouseButtonEventArgs e)
{
// This state variable will control how the 'Mouse Move' and 'Mouse Up' event handlers interpret the user action. The
// 'selectedColumn' field is used as the starting point for any drag-and-drop type of operation.
this.mouseState = MouseState.ButtonDown;
// Evaluate the state of the keyboard. Key combinations involving the shift and control keys will alter the areas that
// are selected.
bool isShiftKeyPressed = ((Keyboard.Modifiers & ModifierKeys.Shift) == ModifierKeys.Shift);
bool isControlKeyPressed = ((Keyboard.Modifiers & ModifierKeys.Control) == ModifierKeys.Control);
// The mouse selected with the mouse button is used as an anchor point unless the shift key is pressed. The anchor
// point allows for ranges of columns to be selected. Everything between the anchor and the currently selected column
// will be selected when the shift key is down. This is modeled after the Excel extended range selection keys.
Point mouseDownLocation = e.GetPosition(this);
// Do not clear the select cells in the Report Grid if the right mouse button is pressed.
if (e.RightButton != MouseButtonState.Pressed)
{
//Since the user is selecting a cell, it will invalidate any row selection that there may be.
foreach (List <ReportRow> block in this.ReportGrid.SelectedRowBlocks)
{
foreach (ReportRow row in block)
{
foreach (ReportCell cell in row.Cells)
{
cell.IsSelected = false;
}
}
}
this.ReportGrid.SelectedRowBlocks.Clear();
this.ReportGrid.SelectedRowHeaderBlocks.Clear();
}
if (!isShiftKeyPressed)
{
IInputElement iInputElement = this.InputHitTest(mouseDownLocation);
DependencyObject dependencyObject = iInputElement as DependencyObject;
while (dependencyObject != null)
{
ReportCell reportCell = DynamicReport.GetCell(dependencyObject);
if (reportCell != null)
{
Keyboard.Focus(dependencyObject as IInputElement);
currentSelectedCell = reportCell;
break;
}
dependencyObject = VisualTreeHelper.GetParent(dependencyObject);
}
this.anchorPoint = mouseDownLocation;
}
// The shift and control key extend the selection operation in the same way as Microsoft Excel.
if (isShiftKeyPressed || isControlKeyPressed)
{
// When the shift key is pressed during column selection, every column between the last column selected
// and the current column is selected.
if (isShiftKeyPressed)
{
// This is an ordered rectangle that encompasses all the selected cells.
Rect selectedRectangle = GetSelectionRectangle(mouseDownLocation);
SetSelectedRectangle(selectedRectangle);
}
// When the control key is pressed a single column is added to the range of columns selected.
if (isControlKeyPressed)
{
// A point marks the range when the control key is pressed. This is almost identical to pressing the mouse
// button except the previous ranges are not cleared. This is part of the extended selection algorithm that is
// modeled after Excel.
Rect selectedRange = new Rect(mouseDownLocation, new Size(0, 0));
// This removes any previous instance of this column in the selection.
foreach (Rect existingRange in this.selectedRanges)
{
if (selectedRange == existingRange)
{
this.selectedRanges.Remove(existingRange);
break;
}
}
// The new range becomes the starting point for any further extended selection operations.
this.selectedRanges.Add(selectedRange);
}
// This instructs the event handlers how the mouse movement is to be interpreted.
this.mouseState = MouseState.Selecting;
}
else
{
// Evaluate if we need to be able to determine the when we right click within the currently selected range then do not clear the selectedRanges.
if (!((e.RightButton == MouseButtonState.Pressed) && (CurrentSelectedCell != null) && (CurrentSelectedCell.IsSelected))) //MIGHT try this --> if (reportCell.Rect.IntersectsWith(selectedRange))
{
// Clear the selected ranges as we do not have a right mouse button pressed with the currently Selected ranges.
// A simple selection that doesn't involve the modifier keys will clear out any previously selected ranges.
this.selectedRanges.Clear();
// The column is added at the start of a new range of selected columns.
this.selectedRanges.Add(new Rect(mouseDownLocation, new Size(0, 0)));
}
}
// Evaluate if we need to be able to determine the when we right click within the currently selected range then do not clear the selectedRanges.
if (!((e.RightButton == MouseButtonState.Pressed) && (CurrentSelectedCell != null) && (CurrentSelectedCell.IsSelected))) //MIGHT try this --> if (reportCell.Rect.IntersectsWith(selectedRange))
{
// This will select all the columns in the selected ranges of columns and remove the selection from all the rest of the cells.
SelectCells();
}
}
