private void DoDragBegin(Gtk.Widget child, Gdk.DragContext context)
{
Gdk.Pixbuf icon;
Plotting.Graph graph = (Plotting.Graph)child;
d_dragRenderer = null;
d_unmerged = null;
d_dragHighlight = null;
// Check if this is going to drag a label
if (graph.Canvas.Graph.LabelHitTest(new Point(d_lastPress), out d_dragRenderer))
{
icon = PixbufForRenderer(graph.Canvas.Graph, d_dragRenderer);
}
else
{
icon = graph.CreateDragIcon();
}
if (icon != null)
{
Gtk.Drag.SetIconPixbuf(context, icon, icon.Width / 2, icon.Height / 2);
}
d_dragging = graph;
IndexOf(child, out d_dragRow, out d_dragColumn);
Gdk.EventMotion evnt = Utils.GetCurrentEvent() as Gdk.EventMotion;
d_dragmerge = (evnt != null && (evnt.State & Gdk.ModifierType.ShiftMask) != 0);
IndexOf(child, out d_dragRow, out d_dragColumn);
QueueDraw();
}
private Gdk.Pixbuf PixbufForRenderer(Plot.Graph graph, Plot.Renderers.Renderer renderer)
{
Plot.Renderers.ILabeled lbl = renderer as Plot.Renderers.ILabeled;
if (lbl == null)
{
return(null);
}
Plot.Renderers.IColored col = renderer as Plot.Renderers.IColored;
string s;
if (lbl.YLabelMarkup != null)
{
s = lbl.YLabelMarkup;
}
else
{
s = System.Security.SecurityElement.Escape(lbl.YLabel);
}
if (col != null)
{
string hex = String.Format("#{0:x2}{1:x2}{2:x2}",
(int)(col.Color.R * 255),
(int)(col.Color.G * 255),
(int)(col.Color.B * 255));
s = String.Format("<span color=\"{0}\">{1}</span>", hex, s);
}
Pango.Layout layout = CreatePangoLayout("");
layout.SetMarkup(s);
if (graph.Font != null)
{
layout.FontDescription = graph.Font;
}
int w;
int h;
layout.GetPixelSize(out w, out h);
int xpadding = 4;
int ypadding = 3;
w += 2 * xpadding;
h += 2 * ypadding;
Gdk.Pixmap map = new Gdk.Pixmap(GdkWindow, w, h);
using (Cairo.Context ctx = Gdk.CairoHelper.Create(map))
{
ctx.Rectangle(0.5, 0.5, w - 1, h - 1);
ctx.LineWidth = 1;
ctx.SetSourceRGB(1, 1, 1);
ctx.FillPreserve();
graph.AxisLabelColors.Bg.Set(ctx);
ctx.FillPreserve();
graph.AxisLabelColors.Fg.Set(ctx);
ctx.Stroke();
ctx.Translate(xpadding + 1, ypadding);
Pango.CairoHelper.ShowLayout(ctx, layout);
}
return(Gdk.Pixbuf.FromDrawable(map, map.Colormap, 0, 0, 0, 0, w, h));
}
