feat: WIP.
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rabbitism
294
src/Ursa/Controls/OverlayShared/OverlayDialogHost.Dialog.cs
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294
src/Ursa/Controls/OverlayShared/OverlayDialogHost.Dialog.cs
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using Avalonia;
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using Avalonia.Animation;
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using Avalonia.Animation.Easings;
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using Avalonia.Controls;
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using Avalonia.Controls.Primitives;
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using Avalonia.Controls.Templates;
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using Avalonia.Input;
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using Avalonia.Layout;
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using Avalonia.Media;
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using Avalonia.Styling;
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using Avalonia.Utilities;
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using Ursa.Controls.OverlayShared;
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using Ursa.EventArgs;
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namespace Ursa.Controls;
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public partial class OverlayDialogHost
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{
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private Point _lastPoint;
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public Thickness SnapThickness { get; set; } = new Thickness(0);
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private void ResetDialogPosition(DialogControlBase control, Size oldSize, Size newSize)
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{
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var width = newSize.Width - control.Bounds.Width;
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var height = newSize.Height - control.Bounds.Height;
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var newLeft = width * control.HorizontalOffsetRatio??0;
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var newTop = height * control.VerticalOffsetRatio??0;
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if(control.ActualHorizontalAnchor == HorizontalPosition.Left)
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{
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newLeft = 0;
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}
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if (control.ActualHorizontalAnchor == HorizontalPosition.Right)
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{
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newLeft = newSize.Width - control.Bounds.Width;
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}
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if (control.ActualVerticalAnchor == VerticalPosition.Top)
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{
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newTop = 0;
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}
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if (control.ActualVerticalAnchor == VerticalPosition.Bottom)
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{
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newTop = newSize.Height - control.Bounds.Height;
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}
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SetLeft(control, Math.Max(0.0, newLeft));
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SetTop(control, Math.Max(0.0, newTop));
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}
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protected override void OnPointerMoved(PointerEventArgs e)
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{
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if (e.Source is DialogControlBase item)
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{
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if (e.GetCurrentPoint(this).Properties.IsLeftButtonPressed)
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{
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var p = e.GetPosition(this);
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var left = p.X - _lastPoint.X;
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var top = p.Y - _lastPoint.Y;
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left = MathUtilities.Clamp(left, 0, Bounds.Width - item.Bounds.Width);
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top = MathUtilities.Clamp(top, 0, Bounds.Height - item.Bounds.Height);
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SetLeft(item, left);
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SetTop(item, top);
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}
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}
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}
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protected override void OnPointerPressed(PointerPressedEventArgs e)
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{
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if (e.Source is DialogControlBase item)
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{
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_lastPoint = e.GetPosition(item);
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}
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}
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protected override void OnPointerReleased(PointerReleasedEventArgs e)
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{
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if (e.Source is DialogControlBase item)
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{
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AnchorDialog(item);
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}
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}
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internal void AddDialog(DialogControlBase control)
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{
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this.Children.Add(control);
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_dialogs.Add(control);
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control.Measure(this.Bounds.Size);
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control.Arrange(new Rect(control.DesiredSize));
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SetToPosition(control);
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control.AddHandler(OverlayFeedbackElement.ClosedEvent, OnDialogControlClosing);
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control.AddHandler(DialogControlBase.LayerChangedEvent, OnDialogLayerChanged);
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ResetZIndices();
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}
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private async void OnDialogControlClosing(object sender, object? e)
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{
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if (sender is DialogControlBase control)
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{
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Children.Remove(control);
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control.RemoveHandler(OverlayFeedbackElement.ClosedEvent, OnDialogControlClosing);
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control.RemoveHandler(DialogControlBase.LayerChangedEvent, OnDialogLayerChanged);
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if (_dialogs.Contains(control))
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{
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_dialogs.Remove(control);
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}
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else if (_modalDialogs.Contains(control))
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{
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_modalDialogs.Remove(control);
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if (_masks.Count > 0)
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{
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var last = _masks.Last();
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await _maskDisappearAnimation.RunAsync(last);
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this.Children.Remove(last);
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_masks.Remove(last);
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if (_masks.Count > 0)
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{
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_masks.Last().IsVisible = true;
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}
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}
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}
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ResetZIndices();
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}
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}
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/// <summary>
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/// Add a dialog as a modal dialog to the host
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/// </summary>
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/// <param name="control"></param>
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internal void AddModalDialog(DialogControlBase control)
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{
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var mask = CreateOverlayMask(control.CanClickOnMaskToClose);
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_masks.Add(mask);
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_modalDialogs.Add(control);
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control.SetAsModal(true);
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for (int i = 0; i < _masks.Count-1; i++)
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{
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_masks[i].Opacity = 0.5;
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}
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ResetZIndices();
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this.Children.Add(mask);
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this.Children.Add(control);
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control.Measure(this.Bounds.Size);
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control.Arrange(new Rect(control.DesiredSize));
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SetToPosition(control);
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control.AddHandler(OverlayFeedbackElement.ClosedEvent, OnDialogControlClosing);
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control.AddHandler(DialogControlBase.LayerChangedEvent, OnDialogLayerChanged);
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_maskAppearAnimation.RunAsync(mask);
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}
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// Handle dialog layer change event
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private void OnDialogLayerChanged(object sender, DialogLayerChangeEventArgs e)
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{
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if (sender is not CustomDialogControl control)
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return;
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if (!_dialogs.Contains(control))
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return;
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int index = _dialogs.IndexOf(control);
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_dialogs.Remove(control);
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int newIndex = index;
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switch (e.ChangeType)
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{
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case DialogLayerChangeType.BringForward:
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newIndex = MathUtilities.Clamp(index + 1, 0, _dialogs.Count);
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break;
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case DialogLayerChangeType.SendBackward:
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newIndex = MathUtilities.Clamp(index - 1, 0, _dialogs.Count);
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break;
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case DialogLayerChangeType.BringToFront:
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newIndex = _dialogs.Count;
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break;
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case DialogLayerChangeType.SendToBack:
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newIndex = 0;
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break;
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}
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_dialogs.Insert(newIndex, control);
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for (int i = 0; i < _dialogs.Count; i++)
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{
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_dialogs[i].ZIndex = i;
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}
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for (int i = 0; i < _masks.Count * 2; i += 2)
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{
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_masks[i].ZIndex = _dialogs.Count + i;
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(_modalDialogs[i] as Control)!.ZIndex = _dialogs.Count + i + 1;
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}
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}
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private void SetToPosition(DialogControlBase? control)
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{
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if (control is null) return;
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double left = GetLeftPosition(control);
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double top = GetTopPosition(control);
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SetLeft(control, left);
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SetTop(control, top);
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AnchorDialog(control);
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}
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private void AnchorDialog(DialogControlBase control)
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{
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control.ActualHorizontalAnchor = HorizontalPosition.Center;
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control.ActualVerticalAnchor = VerticalPosition.Center;
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double left = GetLeft(control);
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double top = GetTop(control);
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double right = Bounds.Width - left - control.Bounds.Width;
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double bottom = Bounds.Height - top - control.Bounds.Height;
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if(top < SnapThickness.Top)
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{
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SetTop(control, 0);
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control.ActualVerticalAnchor = VerticalPosition.Top;
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control.VerticalOffsetRatio = 0;
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}
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if(bottom < SnapThickness.Bottom)
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{
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SetTop(control, Bounds.Height - control.Bounds.Height);
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control.ActualVerticalAnchor = VerticalPosition.Bottom;
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control.VerticalOffsetRatio = 1;
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}
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if(left < SnapThickness.Left)
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{
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SetLeft(control, 0);
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control.ActualHorizontalAnchor = HorizontalPosition.Left;
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control.HorizontalOffsetRatio = 0;
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}
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if(right < SnapThickness.Right)
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{
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SetLeft(control, Bounds.Width - control.Bounds.Width);
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control.ActualHorizontalAnchor = HorizontalPosition.Right;
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control.HorizontalOffsetRatio = 1;
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}
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left = GetLeft(control);
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top = GetTop(control);
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right = Bounds.Width - left - control.Bounds.Width;
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bottom = Bounds.Height - top - control.Bounds.Height;
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control.HorizontalOffsetRatio = (left + right) == 0 ? 0 : left / (left + right);
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control.VerticalOffsetRatio = (top + bottom) == 0 ? 0 : top / (top + bottom);
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}
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private double GetLeftPosition(DialogControlBase control)
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{
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double left = 0;
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double offset = Math.Max(0, control.HorizontalOffset ?? 0);
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left = this.Bounds.Width - control.Bounds.Width;
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if (control.HorizontalAnchor == HorizontalPosition.Center)
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{
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left *= 0.5;
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(double min, double max) = MathUtilities.GetMinMax(0, Bounds.Width * 0.5);
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left = MathUtilities.Clamp(left, min, max);
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}
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else if (control.HorizontalAnchor == HorizontalPosition.Left)
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{
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(double min, double max) = MathUtilities.GetMinMax(0, offset);
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left = MathUtilities.Clamp(left, min, max);
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}
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else if (control.HorizontalAnchor == HorizontalPosition.Right)
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{
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double leftOffset = Bounds.Width - control.Bounds.Width - offset;
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leftOffset = Math.Max(0, leftOffset);
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if(control.HorizontalOffset.HasValue)
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{
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left = MathUtilities.Clamp(left, 0, leftOffset);
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}
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}
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return left;
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}
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private double GetTopPosition(DialogControlBase control)
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{
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double top = 0;
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double offset = Math.Max(0, control.VerticalOffset ?? 0);
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top = this.Bounds.Height - control.Bounds.Height;
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if (control.VerticalAnchor == VerticalPosition.Center)
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{
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top *= 0.5;
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(double min, double max) = MathUtilities.GetMinMax(0, Bounds.Height * 0.5);
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top = MathUtilities.Clamp(top, min, max);
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}
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else if (control.VerticalAnchor == VerticalPosition.Top)
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{
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top = MathUtilities.Clamp(top, 0, offset);
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}
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else if (control.VerticalAnchor == VerticalPosition.Bottom)
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{
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var topOffset = Math.Max(0, Bounds.Height - control.Bounds.Height - offset);
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top = MathUtilities.Clamp(top, 0, topOffset);
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}
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return top;
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}
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}
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