/// <summary>
/// Returns a value indicating whether the lightweight control is visible in the specified direction.
/// </summary>
/// <param name="visibleDirection">The direction in which to determine whether the lightweight control visible.</param>
public bool IsVisible(VisibleDirection visibleDirection)
{
Control parent = Parent;
if (parent != null && parent is LightweightControlContainerControl)
return ((LightweightControlContainerControl)Parent).IsClientRectangleVisible(VirtualClientRectangleToParent(), visibleDirection);
return false;
}
/// <summary>
/// Returns a value indicating whether the specified client rectangle is visible in the
/// specified direction.
/// </summary>
/// <param name="rectangle">The client rectangle check the visibility of.</param>
/// <param name="visibleDirection">The direction to check visibility.</param>
public bool IsClientRectangleVisible(Rectangle rectangle, VisibleDirection visibleDirection)
{
// Obtain the client rectangle.
Rectangle clientRectangle = ClientRectangle;
// Adjust rectangle height if it's larger than the client height.
if (rectangle.Height > clientRectangle.Height)
rectangle.Height = clientRectangle.Height;
// Adjust rectangle width if it's larger than the client width.
if (rectangle.Width > clientRectangle.Width)
rectangle.Width = clientRectangle.Width;
// Check vertical visibility, as specified.
bool verticallyVisible = rectangle.Y >= clientRectangle.Y && rectangle.Bottom <= clientRectangle.Bottom;
bool horizontallyVisible = rectangle.X >= clientRectangle.X && rectangle.Right <= clientRectangle.Right;
// Check visibility.
if (visibleDirection == VisibleDirection.Vertical)
return verticallyVisible;
else if (visibleDirection == VisibleDirection.Horizontal)
return horizontallyVisible;
else if (visibleDirection == VisibleDirection.Both)
return verticallyVisible && horizontallyVisible;
else
{
// Can't happen unless a new type of VisibleDirection is added.
Debug.Fail("Unexpected VisibleDirection.");
return false;
}
}
/// <summary>
/// Makes the lightweight control visible in the specified direction.
/// </summary>
/// <param name="visibleDirection">The direction in which to make the lightweight control visible.</param>
public void MakeVisible(VisibleDirection visibleDirection)
{
Control parent = Parent;
if (parent != null && parent is LightweightControlContainerControl)
((LightweightControlContainerControl)Parent).MakeClientRectangleVisible(VirtualClientRectangleToParent(), visibleDirection);
}
/// <summary>
/// Makes the specified client rectangle visible in the specified direction by adjusting
/// the AutoScrollPosition as needed.
/// </summary>
/// <param name="rectangle">The client rectangle to make visible.</param>
/// <param name="visibleDirection">The direction in which to make the client rectangle visible.</param>
public void MakeClientRectangleVisible(Rectangle rectangle, VisibleDirection visibleDirection)
{
// Obtain the client rectangle.
Rectangle clientRectangle = ClientRectangle;
// Adjust rectangle height if it's larger than the client height.
if (rectangle.Height > clientRectangle.Height)
rectangle.Height = clientRectangle.Height;
// Adjust rectangle width if it's larger than the client width.
if (rectangle.Width > clientRectangle.Width)
rectangle.Width = clientRectangle.Width;
// Check vertical visibility, as specified.
bool verticallyVisible = rectangle.Y >= clientRectangle.Y && rectangle.Bottom <= clientRectangle.Bottom;
bool horizontallyVisible = rectangle.X >= clientRectangle.X && rectangle.Right <= clientRectangle.Right;
// Check visibility.
if (visibleDirection == VisibleDirection.Vertical)
{
if (verticallyVisible)
return;
}
else if (visibleDirection == VisibleDirection.Horizontal)
{
if (horizontallyVisible)
return;
}
else if (visibleDirection == VisibleDirection.Both)
{
if (verticallyVisible && horizontallyVisible)
return;
}
// Calculate the vertical delta, as specified and needed.
int verticalDelta = 0;
if ((visibleDirection & VisibleDirection.Vertical) != 0 && !verticallyVisible)
{
if (rectangle.Top < 0)
verticalDelta = rectangle.Top;
else
verticalDelta = rectangle.Bottom - clientRectangle.Height;
}
// Calculate the horizontal delta, as specified and needed.
int horizontalDelta = 0;
if ((visibleDirection & VisibleDirection.Horizontal) != 0 && !horizontallyVisible)
{
if (rectangle.Left < 0)
horizontalDelta = rectangle.Left;
else
horizontalDelta = rectangle.Right - clientRectangle.Right;
}
// Adjust the auto-scroll position.
AutoScrollPosition = new Point(Math.Abs(AutoScrollPosition.X) + horizontalDelta,
Math.Abs(AutoScrollPosition.Y) + verticalDelta);
}