private static ObservableCollection<EventsForDay> RemoveEventFromGroup(Event ev, ObservableCollection<EventsForDay> eventsByDay)
{
foreach (var group in eventsByDay)
{
group.Remove(ev);
}
return new ObservableCollection<EventsForDay>(eventsByDay.Where(group => group.Count > 0));
}
private async void DeleteEvent(Event ev)
{
try
{
await DataStore.RemoveEvent(ev);
Events.Remove(ev);
}
catch (Exception ex)
{
ReportError(ex);
}
}
private static void AddEventToGroup(Event ev, ObservableCollection<EventsForDay> eventsByDay)
{
for (var date = ev.Start; date < ev.End; date = date.AddDays(1))
{
var day = eventsByDay.FirstOrDefault(d => d.Date == date);
if (day != null)
{
day.Add(ev);
}
else
{
day = new EventsForDay { Date = date };
day.Add(ev);
// Insert in chronological order (rather than following each add with an OrderBy...)
//
int index = eventsByDay.IndexOf(eventsByDay.FirstOrDefault(e => e.Date > day.Date));
if (index < 0)
{
index = eventsByDay.Count;
}
eventsByDay.Insert(index, day);
}
}
}
/// <summary>
/// Create one or more labels for an event and place them on the grid.
/// </summary>
/// <param name="ev">Event to place</param>
/// <returns>The placed labels</returns>
private List<DraggableView> PlaceEvent(Event ev)
{
var labels = new List<DraggableView>();
var offset = (ev.StartDate - Start.Date).Days;
var row = (int)Math.Truncate((double)offset / _cols);
var daySpan = ev.DaySpan;
var rowSpan = (int)Math.Ceiling((double)(offset + daySpan) / _cols);
// Truncate events that actually start before the selected start date
//
bool truncatedStart = false;
if (offset < 0)
{
daySpan += offset;
offset = 0;
truncatedStart = true;
}
var col = offset % _cols;
var colSpan = 0;
System.Diagnostics.Debug.WriteLine($"{ev.Name} has a day span of {daySpan}");
for (int day = 0; day < daySpan && row < _rows; day += colSpan, row++)
{
colSpan = Math.Min(daySpan - day, _cols - col);
// Margin is adjusted so labels that span rows appear continuous
//
var margin = new Thickness(day == 0 && !truncatedStart ? _defaultMargin : 0,
_defaultMargin,
(day + colSpan < daySpan) ? 0 : _defaultMargin,
_defaultMargin);
labels.Add(PlaceEventLabel(ev, row, col, colSpan, margin));
col = 0; // only the first row has a column offset
}
return labels;
}
private async void EditEvent(Event ev)
{
try
{
_editingEvent = ev;
var eventVM = await Navigator.PushModalAndWaitAsync<EventEditorViewModel>(vm => vm.Event = ev);
if (eventVM.Result == ModalResult.Deleted)
{
await DataStore.RemoveEvent(ev);
Events.Remove(ev);
}
else if (eventVM.Result != ModalResult.Canceled)
{
await DataStore.UpdateEvent(ev);
}
}
catch (Exception ex)
{
ReportError(ex);
}
_editingEvent = null;
}
/// <summary>
/// Remove resize mode views
/// </summary>
/// <param name="overlay">The resize mode overlay that triggered this, so we can remove it</param>
private void EndResizeMode(View overlay)
{
_grid.Children.Remove(overlay);
_grid.Children.Remove(_rightResizeHandle);
_grid.Children.Remove(_rightResizeHandleDragger);
_grid.Children.Remove(_leftResizeHandle);
_grid.Children.Remove(_leftResizeHandleDragger);
((TappableView)overlay).Tapped -= HandleOverlayTapped;
_rightResizeHandleDragger.Dragging -= HandleResizeDragging;
_rightResizeHandleDragger.Dragged -= HandleResizeDragged;
_rightResizeHandleDragger.DragCanceled -= HandleResizeCanceled;
_leftResizeHandleDragger.Dragging -= HandleResizeDragging;
_leftResizeHandleDragger.Dragged -= HandleResizeDragged;
_leftResizeHandleDragger.DragCanceled -= HandleResizeCanceled;
// Reset opacity
foreach (var label in _labels)
{
label.Opacity = 1.0;
}
UnhighlightCells();
_resizingEvent = null;
_rightResizeHandle = null;
_rightResizeHandleDragger = null;
_leftResizeHandle = null;
_leftResizeHandleDragger = null;
_resizeRange = null;
}
/// <summary>
/// Moves an event to a new start date (preserving duration) and updates labels.
/// </summary>
/// <param name="ev">Event to move</param>
/// <param name="newStartDate">New start date for event</param>
private void MoveEvent(Event ev, DateTime newStartDate)
{
var newRange = new TimeRange(ev.Start, ev.End);
newRange.MoveToDate(newStartDate);
UpdateEvent(ev, newRange);
}
/// <summary>
/// Applies the new range to the event and updates its label(s)
/// </summary>
/// <param name="ev">Event to update</param>
/// <param name="newRange">Desired time range for the event</param>
private void UpdateEvent(Event ev, TimeRange newRange)
{
// Q: Why don't we just update the properties on the Event and let the property change events handle this?
// A: Mainly to avoid having to deal with multiple notifications firing for a single change (e.g., moving an event)
// Updating the calendar labels is a bit more expensive than just updating a text box.
if (newRange.Start == ev.Start && newRange.End == ev.End)
{
// no change
return;
}
var newCells = GetCellsForRange(newRange.StartDate, newRange.EndDate);
if (!newCells.Any())
{
// Don't allow moving off the calendar entirely
//
return;
}
_updatingEvent = true;
ev.Start = newRange.Start;
ev.End = newRange.End;
_updatingEvent = false;
var labels = _labels.Where(l => l.BindingContext == ev).ToList();
System.Diagnostics.Debug.Assert(labels.Any());
var label = labels.First();
bool wasMultiRow = labels.Count > 1;
var newRows = newCells.Select(cell => Grid.GetRow(cell)).Distinct().ToList();
bool willBeMultiRow = newRows.Count > 1;
// If the event fit on a single row before and will still fit on a single row,
// then we can "simply" move the existing label. Otherwise, we need to recreate,
// because multiple labels are involved with changing widths etc.
//
if (!wasMultiRow && !willBeMultiRow && GetEventContainerForRow(newRows.First()) == label.ParentView)
{
var container = label.ParentView as AutoStackGrid;
// So basically all the previous complexity is being turned into:
// AutoStackGrids span whole week (row). If the event is being moved
// within a row, we just reposition it in the stack grid. Otherwise
// re-create.
// Note that even with the stack-per-row model, moving items between
// layout containers is problematic on WinPhone (hence re-creating instead)
var newCols = newCells.Select(cell => Grid.GetColumn(cell)).OrderBy(col => col).ToList();
// Defer layout until we're done updating properties
//
container.DeferLayout = true;
AutoStackGrid.SetColumn(label, newCols.First());
AutoStackGrid.SetColumnSpan(label, newCols.Last() - newCols.First() + 1);
// Update margin. Even though we're staying on one row, there's the possibility that
// the event actually stretches before and/or after that row and those parts just aren't visible
//
bool truncatedStart = ev.Start < (newCells.First().BindingContext as DateTime?).Value;
// Subtracting 1 second because an end time of midnight is exclusive and should only
// label the previous day
//
bool truncatedEnd = ev.End.AddSeconds(-1).Date > (newCells.Last().BindingContext as DateTime?).Value;
var margin = new Thickness(!truncatedStart ? _defaultMargin : 0,
_defaultMargin,
!truncatedEnd ? _defaultMargin : 0,
_defaultMargin);
AutoStackGrid.SetMargin(label, margin);
container.DeferLayout = false;
container.ForceLayout();
}
else
{
// Recreate labels
// Removing a label just to create a new one in its place caused movement flicker
// on WinPhone if we rely on adding/removing to automatically update layout.
// So that behavior is temporarily disabled on AutoStackGrid, and instead we
// explicitly call ForceLayout on grids that have been modified.
//
var oldContainers = labels.Select(l => l.ParentView).OfType<AutoStackGrid>().ToList();
foreach (var container in oldContainers)
{
container.DeferLayout = true;
}
ClearEventLabels(labels);
_labels = _labels.Except(labels).ToList();
var newLabels = PlaceEvent(ev);
foreach (var container in oldContainers.Union(newLabels.Select(l => l.ParentView)).OfType<AutoStackGrid>())
{
container.ForceLayout();
container.DeferLayout = false;
}
}
}
/// <summary>
/// Creates overlay and tracking handles, highlights cells, and dims other events.
/// </summary>
/// <param name="ev">Event to resize</param>
private void BeginResizeMode(Event ev)
{
_resizingEvent = ev;
_resizeRange = new TimeRange(ev.Start, ev.End);
// Create overlay to capture taps for dismissing resize mode
//
var overlay = new TappableView();
Grid.SetRowSpan(overlay, _rows + 1);
Grid.SetColumnSpan(overlay, _cols);
overlay.BackgroundColor = Color.Transparent;
overlay.Tapped += HandleOverlayTapped;
_grid.Children.Add(overlay);
// Dim everything but this event
//
foreach (var label in _labels.Where(l => l.BindingContext != _resizingEvent))
{
label.Opacity = 0.5;
}
HighlightCells(_resizingEvent.StartDate, _resizingEvent.EndDate);
var cells = GetCellsForRange(_resizingEvent.StartDate, _resizingEvent.EndDate);
var firstCell = cells.First();
var lastCell = cells.Last();
_leftResizeHandle = CreateResizeHandleVisual(Grid.GetColumn(firstCell), Grid.GetRow(firstCell), false);
_grid.Children.Add(_leftResizeHandle);
_rightResizeHandle = CreateResizeHandleVisual(Grid.GetColumn(lastCell), Grid.GetRow(lastCell), true);
_grid.Children.Add(_rightResizeHandle);
_leftResizeHandleDragger = CreateResizeHandleDraggerForVisual(_leftResizeHandle);
_grid.Children.Add(_leftResizeHandleDragger);
_rightResizeHandleDragger = CreateResizeHandleDraggerForVisual(_rightResizeHandle);
_grid.Children.Add(_rightResizeHandleDragger);
}
/// <summary>
/// Create an individual label corresponding to an event (possibly only part of the
/// event) and place it on the grid.
/// </summary>
private DraggableView PlaceEventLabel(Event ev, int row, int col, int colSpan, Thickness margin = default(Thickness))
{
System.Diagnostics.Debug.WriteLine($"Placing {ev.Name} with a span of {colSpan}");
var view = new DraggableView { BackgroundColor = Color.Blue, VerticalOptions = LayoutOptions.FillAndExpand };
view.BindingContext = ev;
var label = new Label();
label.SetBinding<Event>(Label.TextProperty, e => e.Name);
label.VerticalOptions = LayoutOptions.Fill;
label.YAlign = TextAlignment.Center;
label.FontSize = Device.GetNamedSize(NamedSize.Small, view);
label.HorizontalOptions = LayoutOptions.FillAndExpand;
view.Content = label;
AutoStackGrid.SetMargin(view, margin);
var container = GetEventContainerForRow(row + 1);
container.AddChild(view, col, colSpan);
var tapGesture = new TapGestureRecognizer();
// First binding is to the "parent" context (i.e., ours, as opposed to the label's)
//tapGesture.SetBinding(TapGestureRecognizer.CommandProperty, new Binding("EditEventCommand", BindingMode.Default, null, null, null, _vm));
//tapGesture.SetBinding(TapGestureRecognizer.CommandParameterProperty, new Binding("."));
// Activates resize mode instead of opening editor
//
tapGesture.Tapped += HandleEventTapped;
view.GestureRecognizers.Add(tapGesture);
view.Dragged += HandleDragged;
view.DragStart += HandleDragStart;
view.Dragging += HandleDragging;
view.DragCanceled += HandleDragCanceled;
_labels.Add(view);
return view;
}
/// <summary>
/// Sets the opacity for all labels corresponding to a specified Event.
/// </summary>
/// <param name="ev">Event to set opacity for</param>
/// <param name="opacity">Desired opacity</param>
private void SetEventOpacity(Event ev, double opacity)
{
var labels = _labels.Where(l => l.BindingContext == ev).ToList();
foreach (var label in labels)
{
label.Opacity = opacity;
}
}
public async void EventEditor_SettingEvent_UpdatesProperties()
{
var ev = new Event { Name = "Bob" };
await _vm.WaitForPropertyChangeAsync(() => _vm.Name, () =>
{
_vm.Event = ev;
});
Assert.AreEqual(ev.Name, _vm.Name);
}
public Task UpdateEvent(Event ev)
{
return Connection.UpdateAsync(ev);
}
public Task RemoveEvent(Event ev)
{
return Connection.DeleteAsync(ev);
}
public Task AddEvent(Event ev)
{
return Connection.InsertAsync(ev);
}
protected override void Done()
{
if (_end <= _start)
{
ReportMessage("Start must precede End", "Time travel is not supported");
return;
}
Result = ModalResult.Done;
if (_event == null)
{
_event = new Event { AllDay = true };
}
_event.Name = Name;
_event.Start = Start;
_event.End = End;
Navigator.PopModalAsync();
}
