/// <summary>
/// Selects the specified map location in the <see cref="MapView"/>, replacing either the
/// old or the new selection data, depending on the current editing mode.</summary>
/// <param name="location">
/// The coordinates of the <see cref="Site"/> to select in the <see cref="MapView"/>.
/// </param>
/// <param name="center">
/// <c>true</c> to center the <see cref="MapView"/> on the specified <paramref
/// name="location"/>; otherwise, <c>false</c>.</param>
/// <remarks><para>
/// <b>SetSelection</b> always sets the coordinates of the current selection to the
/// specified <paramref name="location"/>.
/// </para><para>
/// In "Modify" mode, or if the previous selection was invalid, <b>SetSelection</b> also
/// replaces all other data of the current selection with the data of the specified
/// <paramref name="location"/>. The <see cref="Site"/> at that <paramref name="location"/>
/// remains unchanged.
/// </para><para>
/// In "Replace" mode, <b>SetSelection</b> overwrites the data at the specified <paramref
/// name="location"/> with that of the current selection, and sets the <see
/// cref="SectionTabItem.DataChanged"/> and <see cref="WorldChanged"/> flags.
/// </para><para>
/// In "Fill" mode, <b>SetSelection</b> also overwrites the data of all contiguous sites
/// that contain the same data as the specified <paramref name="location"/>.
/// </para><para>
/// The specified <paramref name="location"/> may be invalid, in which case the current
/// selection is cleared and all site editing controls are reset. <b>SetSelection</b>
/// returns <c>false</c> in this case; otherwise, <c>true</c>.</para></remarks>
private void SetSelection(PointI location, bool center)
{
// prevent control input events
++this._ignoreEvents;
// highlight site in map panel
MapView.SelectedSite = location;
// read back to check validity
location = MapView.SelectedSite;
// clear data if selection invalid
if (location == Site.InvalidLocation)
{
ClearSelection();
goto finished;
}
// center map view on selection if desired
if (center)
{
MapView.CenterOn(location);
}
// enable controls for selected site
SiteGroup.IsEnabled = true;
SiteGroup.Header = Site.FormatLabel(location);
// valid selection allows Replace and Fill modes
ReplaceToggle.IsEnabled = FillToggle.IsEnabled = true;
/*
* 1. Modify mode overwrites selection with site
* 2. Replace mode overwrites site with selection
* 3. Fill mode overwrites area with selection
*/
if (ModifyToggle.IsChecked == true)
{
this._selection = this._worldState.CreateArea(location);
// show site owner in combo box
string owner = this._selection.Owner;
if (owner.Length == 0)
{
OwnerCombo.SelectedIndex = 0;
}
else
{
OwnerCombo.SelectedItem = owner;
}
}
else if (this._selection != null && ReplaceToggle.IsChecked == true)
{
// move selection to new site and replace its data
this._selection.Bounds[0] = new RectI(location.X, location.Y, 1, 1);
this._worldState.CreateSite(this._selection);
// broadcast data changes
WorldChanged = true;
SectionTab.DataChanged = true;
MapView.Redraw();
}
else if (this._selection != null && FillToggle.IsChecked == true)
{
Cursor oldCursor = MainWindow.Instance.Cursor;
MainWindow.Instance.Cursor = Cursors.Wait;
// check for Area equality with specified location
Area area = this._worldState.CreateArea(location);
Debug.Assert(area != null);
Predicate <PointI> match = (p => area.Equals(this._worldState.CreateArea(p)));
// find contiguous sites with equal data
FloodFill floodFill = new FloodFill(MapView.MapGrid);
if (floodFill.FindMatching(match, location))
{
// copy selection data to all sites within fill area
foreach (PointI fillSite in floodFill.Nodes)
{
this._selection.Bounds[0] = new RectI(fillSite.X, fillSite.Y, 1, 1);
this._worldState.CreateSite(this._selection);
}
}
// move selection to new site and replace its data
this._selection.Bounds[0] = new RectI(location.X, location.Y, 1, 1);
this._worldState.CreateSite(this._selection);
// broadcast data changes
WorldChanged = true;
SectionTab.DataChanged = true;
MapView.Redraw();
MainWindow.Instance.Cursor = oldCursor;
}
finished:
// allow control input events
--this._ignoreEvents;
}
