/// <summary>Restores the snapshot.</summary>
public void Restore(DiagramViewer view) {
var appliedSettings = _restoreSettings(view);
var appliedFilter = _restoreFilter(view.Shell);
if (appliedSettings && !appliedFilter) {
view.RecomputeLayout(true);
}
_restoreViewport(view);
view.Shell.ViewName = Name;
}
/// <summary>Gets a snapshot that captures the given diagram view.</summary>
public static DiagramSnapshot Capture(DiagramViewer view, DiagramSnapshotScope scope) {
var snapshot = new DiagramSnapshot(view.Shell.ViewName, scope);
if (snapshot.Matches(DiagramSnapshotScope.Viewport)) {
snapshot._captureViewport(view);
}
if (snapshot.Matches(DiagramSnapshotScope.Settings)) {
snapshot._captureSettings(view);
}
if (snapshot.Matches(DiagramSnapshotScope.Filter)) {
snapshot._captureFilter(view.Shell);
}
return snapshot;
}
private bool _restoreSettings(DiagramViewer view) {
if (Matches(DiagramSnapshotScope.Settings)) {
var diagram = view.DiagramCanvas;
diagram.DisplayOptions = _displayOptions;
diagram.LayoutMethod = _layoutMethod;
diagram.LayoutOrientation = _layoutOrientation;
diagram.LayoutRatio = _layoutRatio;
return true;
} else {
return false;
}
}
private void _captureSettings(DiagramViewer view) {
var diagram = view.DiagramCanvas;
_displayOptions = diagram.DisplayOptions;
_layoutMethod = diagram.LayoutMethod;
_layoutOrientation = diagram.LayoutOrientation;
_layoutRatio = diagram.LayoutRatio;
}
private bool _restoreViewport(DiagramViewer view) {
if (Matches(DiagramSnapshotScope.Viewport)) {
view.DiagramScroller.ScrollToHorizontalOffset(_origin.X);
view.DiagramScroller.ScrollToVerticalOffset(_origin.Y);
view.ZoomSlider.Value = _scale;
return true;
} else {
return false;
}
}
private void _captureViewport(DiagramViewer view) {
_scale = view.ZoomSlider.Value;
_origin = new Point(view.DiagramScroller.HorizontalOffset, view.DiagramScroller.VerticalOffset);
}
/// <summary>Creates a new <see cref="DiagramHistory"/> instance.</summary>
public DiagramHistory(DiagramViewer viewer) {
_viewer = viewer;
_past = new Stack<DiagramSnapshot>();
_future = new Stack<DiagramSnapshot>();
}