void ShowPlaceholder(DockToolbar bar, bool horz, int x, int y, int w, int h)
{
if (orientation != Orientation.Horizontal)
horz = !horz;
PanelToWindow (x, y, w, h, out x, out y, out w, out h);
bool created = false;
if (placeholder == null || horz != currentPlaceholderHorz) {
HidePlaceholder ();
placeholder = new PlaceholderWindow (parentFrame);
placeholderArrow1 = new ArrowWindow (parentFrame, horz ? ArrowWindow.Direction.Right : ArrowWindow.Direction.Down);
placeholderArrow2 = new ArrowWindow (parentFrame, horz ? ArrowWindow.Direction.Left : ArrowWindow.Direction.Up);
currentPlaceholderHorz = horz;
created = true;
}
int sx, sy;
this.GdkWindow.GetOrigin (out sx, out sy);
sx += x;
sy += y;
int mg = -4;
placeholder.Move (sx - mg, sy - mg);
placeholder.Resize (w + mg*2, h + mg * 2);
if (horz) {
placeholderArrow1.Move (sx - placeholderArrow1.Width, sy + (h/2) - placeholderArrow1.Height/2);
placeholderArrow2.Move (sx + w, sy + (h/2) - placeholderArrow1.Height/2);
} else {
int px = sx + w/2 - placeholderArrow1.Width/2;
if (px < 0) px = 0;
placeholderArrow1.Move (px, sy - placeholderArrow1.Height);
placeholderArrow2.Move (px, sy + h);
}
if (created) {
placeholder.Show ();
placeholder.Present ();
if (bar.FloatingDock != null)
bar.FloatingDock.Present ();
placeholderArrow1.Present ();
placeholderArrow2.Present ();
}
}
void HidePlaceholder()
{
if (placeholder == null) return;
placeholder.Destroy ();
placeholder = null;
placeholderArrow1.Destroy ();
placeholderArrow1 = null;
placeholderArrow2.Destroy ();
placeholderArrow2 = null;
if (dropRow != -1 && !dropNewRow) {
RestoreShiftedBars (dropRow);
dropRow = -1;
}
}