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Batch flip-view range updates for programmatic calendar navigation (#805)

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* Batch calendar range updates during programmatic navigation

* Refine programmatic calendar navigation batching state
This commit is contained in:
Burak Kaan Köse
2026-02-13 14:37:24 +01:00
committed by GitHub
parent dbd5812c45
commit 92df726f34
2 changed files with 83 additions and 21 deletions
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Wino.Mail.WinUI/Controls/Calendar/WinoCalendarFlipView.cs
+60 -20
View File
@@ -43,6 +43,12 @@ public partial class WinoCalendarFlipView : CustomCalendarFlipView
set { SetValue(IsIdleProperty, value); }
}
internal bool IsProgrammaticNavigationInProgress { get; private set; }
internal int? PendingTargetIndex { get; private set; }
internal event EventHandler<ProgrammaticNavigationCompletedEventArgs>? ProgrammaticNavigationCompleted;
public WinoCalendarFlipView()
{
RegisterPropertyChangedCallback(ItemsSourceProperty, new DependencyPropertyChangedCallback(OnItemsSourceChanged));
@@ -123,37 +129,61 @@ public partial class WinoCalendarFlipView : CustomCalendarFlipView
await DispatcherQueue.EnqueueAsync(() =>
{
// Find the day range that contains the date.
var dayRange = GetItemsSource()?.FirstOrDefault(a => a.CalendarDays.Any(b => b.RepresentingDate.Date == dateTime.Date));
var dayRanges = GetItemsSource();
var dayRange = dayRanges?.FirstOrDefault(a => a.CalendarDays.Any(b => b.RepresentingDate.Date == dateTime.Date));
if (dayRange != null)
if (dayRange != null && dayRanges != null)
{
var navigationItemIndex = GetItemsSource().IndexOf(dayRange);
var navigationItemIndex = dayRanges.IndexOf(dayRange);
var hasNavigationWork = navigationItemIndex != SelectedIndex;
if (Math.Abs(navigationItemIndex - SelectedIndex) > 4)
IsProgrammaticNavigationInProgress = hasNavigationWork;
PendingTargetIndex = navigationItemIndex;
if (!hasNavigationWork)
{
// Difference between dates are high.
// No need to animate this much, just go without animating.
SelectedIndex = navigationItemIndex;
PendingTargetIndex = null;
return;
}
else
{
// Until we reach the day in the flip, simulate next-prev button clicks.
// This will make sure the FlipView animations are triggered.
// Setting SelectedIndex directly doesn't trigger the animations.
while (SelectedIndex != navigationItemIndex)
try
{
if (Math.Abs(navigationItemIndex - SelectedIndex) > 4)
{
if (SelectedIndex > navigationItemIndex)
// Difference between dates are high.
// No need to animate this much, just go without animating.
SelectedIndex = navigationItemIndex;
}
else
{
// Until we reach the day in the flip, simulate next-prev button clicks.
// This will make sure the FlipView animations are triggered.
// Setting SelectedIndex directly doesn't trigger the animations.
while (SelectedIndex != navigationItemIndex)
{
GoPreviousFlip();
}
else
{
GoNextFlip();
if (SelectedIndex > navigationItemIndex)
{
GoPreviousFlip();
}
else
{
GoNextFlip();
}
}
}
}
finally
{
if (SelectedIndex == PendingTargetIndex)
{
ProgrammaticNavigationCompleted?.Invoke(this, new ProgrammaticNavigationCompletedEventArgs(SelectedItem as DayRangeRenderModel ?? dayRange));
}
IsProgrammaticNavigationInProgress = false;
PendingTargetIndex = null;
}
}
});
}
@@ -161,3 +191,13 @@ public partial class WinoCalendarFlipView : CustomCalendarFlipView
private ObservableRangeCollection<DayRangeRenderModel> GetItemsSource()
=> ItemsSource as ObservableRangeCollection<DayRangeRenderModel>;
}
internal sealed class ProgrammaticNavigationCompletedEventArgs : EventArgs
{
public ProgrammaticNavigationCompletedEventArgs(DayRangeRenderModel dayRange)
{
DayRange = dayRange;
}
public DayRangeRenderModel DayRange { get; }
}