// Public Constructor
public ColorGrid()
{
// Creation Border obj for element
bord = new Border();
bord.BorderBrush = SystemColors.ControlDarkDarkBrush;
bord.BorderThickness = new Thickness(1);
AddVisualChild(bord);
AddLogicalChild(bord);
// Creation UniformGrid as child of Border
unigrid = new UniformGrid();
unigrid.Background = SystemColors.WindowBrush;
unigrid.Columns = xNum;
bord.Child = unigrid;
// Filling panel UniformGrid with ColorCell objects
for (int y = 0; y < yNum; y++)
{
for (int x = 0; x < xNum; x++)
{
Color clr = (Color)typeof(Colors).
GetProperty(strColors[y, x]).GetValue(null, null);
cells[y, x] = new ColorCell(clr);
unigrid.Children.Add(cells[y, x]);
if (clr == SelectedColor)
{
cellSelected = cells[y, x];
cells[y, x].IsSelected = true;
}
ToolTip tip = new ToolTip();
tip.Content = strColors[y, x];
cells[y, x].ToolTip = tip;
}
}
}
protected override void OnMouseLeave(MouseEventArgs args)
{
base.OnMouseLeave(args);
if (cellHighlighted != null)
{
cellHighlighted.IsHighlighted = false;
cellHighlighted = null;
}
}
protected override void OnLostKeyboardFocus(
KeyboardFocusChangedEventArgs args)
{
base.OnGotKeyboardFocus(args);
//base.OnLostKeyboardFocus(args);
if (cellHighlighted != null)
{
cellHighlighted.IsHighlighted = false;
cellHighlighted = null;
}
}
protected override void OnMouseMove(MouseEventArgs args)
{
base.OnMouseMove(args);
ColorCell cell = args.Source as ColorCell;
if (cell != null)
{
if (cellHighlighted != null)
{
cellHighlighted.IsHighlighted = false;
}
cellHighlighted = cell;
cellHighlighted.IsHighlighted = true;
}
}
protected override void OnMouseDown(MouseButtonEventArgs args)
{
base.OnMouseDown(args);
ColorCell cell = args.Source as ColorCell;
if (cell != null)
{
if (cellHighlighted != null)
{
cellHighlighted.IsSelected = false;
}
cellHighlighted = cell;
cellHighlighted.IsSelected = true;
}
Focus();
}
// Handling keyboard events
protected override void OnGotKeyboardFocus(
KeyboardFocusChangedEventArgs args)
{
base.OnGotKeyboardFocus(args);
if (cellHighlighted == null)
{
if (cellHighlighted != null)
{
cellHighlighted = cellSelected;
}
else
{
cellHighlighted = cells[0, 0];
}
cellHighlighted.IsHighlighted = true;
}
}
protected override void OnMouseUp(MouseButtonEventArgs args)
{
base.OnMouseUp(args);
ColorCell cell = args.Source as ColorCell;
if (cell != null)
{
if (cellSelected != null)
{
cellSelected.IsSelected = false;
}
cellSelected = cell;
cellSelected.IsSelected = true;
clrSelected = (cellSelected.Brush
as SolidColorBrush).Color;
OnSelectedColorChanged(EventArgs.Empty);
}
}
protected override void OnKeyDown(KeyEventArgs args)
{
base.OnKeyDown(args);
int index = unigrid.Children.IndexOf(cellHighlighted);
int y = index / xNum;
int x = index % xNum;
switch (args.Key)
{
case Key.Home:
y = 0;
x = 0;
break;
case Key.End:
y = yNum - 1;
x = xNum + 1;
break;
case Key.Down:
if ((y = (y + 1) % yNum) == 0)
{
x++;
}
break;
case Key.Up:
if ((y = (y + yNum - 1) % yNum) == yNum - 1)
{
x--;
}
break;
case Key.Right:
if ((x = (x + 1) % xNum) == 0)
{
y++;
}
break;
case Key.Left:
if ((x = (x + xNum - 1) % xNum) == xNum - 1)
{
y--;
}
break;
case Key.Enter:
case Key.Space:
if (cellSelected != null)
{
cellSelected.IsSelected = false;
}
cellSelected = cellHighlighted;
cellSelected.IsSelected = true;
clrSelected = (cellSelected.Brush
as SolidColorBrush).Color;
OnSelectedColorChanged(EventArgs.Empty);
break;
default:
return;
}
if (x >= xNum || y >= yNum)
{
MoveFocus(new TraversalRequest(
FocusNavigationDirection.Previous));
}
else
{
cellHighlighted.IsHighlighted = false;
cellHighlighted = cells[y, x];
cellHighlighted.IsHighlighted = true;
}
args.Handled = true;
}
