/// <summary>
/// Draw selection handles on the given placement
/// </summary>
/// <param name="e"></param>
/// <param name="placement"></param>
private void DrawSelectionBoxes(ItemPaintEventArgs e, VCItemPlacement placement)
{
if (!container.SelectedItems.Contains(placement))
{
return;
}
var g = e.Graphics;
using (var pen = new Pen(Color.Red, 2.0f / e.ZoomFactor))
{
g.DrawRectangle(pen, new Rectangle(Point.Empty, placement.Item.Size));
}
}
/// <summary>
/// Draw in the context of the container using the given draw handler.
/// The graphics provided to the draw handler is adjust for the
/// zoom factor and position of the container.
/// </summary>
/// <param name="g"></param>
public void DrawContainer(ItemPaintEventArgs e, DrawContainerHandler drawHandler)
{
var g = e.Graphics;
var savedTx = g.Transform;
try
{
drawHandler(new ItemPaintEventArgs(g, e.VisibleRectangle));
}
finally
{
g.Transform = savedTx;
}
}
/// <summary>
/// Draw this item on the given graphics.
/// The graphics is transformed such that this item can draw starting at (0, 0).
/// </summary>
public virtual void Draw(ItemPaintEventArgs e)
{
if (keyboardHandler != null)
{
keyboardHandler.OnPostPaint(this, e);
}
if (mouseHandler != null)
{
mouseHandler.OnPostPaint(this, e);
}
if (dragDropHandler != null)
{
dragDropHandler.OnPostPaint(this, e);
}
}
/// <summary>
/// Draw this item and all child items
/// </summary>
/// <param name="g"></param>
public void DrawItems(ItemPaintEventArgs e, DrawItemHandler drawHandler)
{
Graphics g = e.Graphics;
GraphicsState saved = g.Save();
try
{
var visibleRect = e.VisibleRectangle;
SetupDrawItemsTransform(g, ref visibleRect);
foreach (VCItemPlacement placement in items.OrderBy(x => x.Item.Priority))
{
if (placement.Item.Visible)
{
var placementBounds = placement.Bounds;
if (placementBounds.IntersectsWith(visibleRect))
{
// Save transformation matrix
Matrix tx = g.Transform;
try
{
// Translate graphics
g.MultiplyTransform(placement.Transform);
// Calculate visible rectangle of placement
var placementVisRect = Rectangle.Intersect(placementBounds, visibleRect);
var localVisRect = placement.ToLocal(placementVisRect);
// Draw placement
drawHandler(new ItemPaintEventArgs(g, localVisRect), placement);
}
finally
{
g.Transform = tx;
}
}
}
}
}
finally
{
if (null != saved)
{
g.Restore(saved);
}
}
}
/// <summary>
/// Draw selection
/// </summary>
public void Paint(VCItem sender, ItemPaintEventArgs e)
{
if (selecting)
{
var rect = SelectionBounds;
if (!rect.IsEmpty)
{
using (var pen = new Pen(Color.Black))
{
pen.DashStyle = DashStyle.Dot;
e.Graphics.DrawRectangle(pen, SelectionBounds.Round());
}
}
}
// Draw selection boxes (if any)
if (container.SelectedItems.Count > 0)
{
container.DrawItems(e, DrawSelectionBoxes);
}
}
/// <summary>
/// Draw this item and all child items
/// </summary>
/// <param name="g"></param>
public override void Draw(ItemPaintEventArgs e)
{
List <VCItem> nowVisible = new List <VCItem>();
DrawItems(e, delegate(ItemPaintEventArgs ie, VCItemPlacement placement) {
placement.Item.Draw(ie);
nowVisible.Add(placement.Item);
});
// Notify all items that are no longer visible
foreach (VCItem item in this.visibleItems)
{
if (!nowVisible.Contains(item))
{
item.OnLostVisibility();
}
}
this.visibleItems = nowVisible;
base.Draw(e);
}
/// <summary>
/// Draw all child items using the given draw handler.
/// </summary>
/// <param name="g"></param>
void IVCItemContainer.DrawItems(ItemPaintEventArgs e, DrawItemHandler drawHandler)
{
rootContainer.DrawItems(e, drawHandler);
}
