112 lines
4.3 KiB
C#
112 lines
4.3 KiB
C#
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using System;
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using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Controls.Primitives;
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using HandyControl.Tools;
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using HandyControl.Tools.Interop;
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namespace HandyControl.Controls
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{
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public class MenuTopLineAttach
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{
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public static readonly DependencyProperty PopupProperty = DependencyProperty.RegisterAttached(
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"Popup", typeof(Popup), typeof(MenuTopLineAttach), new PropertyMetadata(default(Popup), OnPopupChanged));
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private static void OnPopupChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
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{
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var topLine = (FrameworkElement)d;
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if (e.NewValue is Popup)
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{
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Popup popup = e.NewValue as Popup;
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MenuItem menuItem = popup.TemplatedParent as MenuItem;
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SetTopLine(menuItem, topLine);
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menuItem.Loaded += MenuItem_Loaded;
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}
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}
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private static void MenuItem_Loaded(object sender, RoutedEventArgs e)
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{
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var menuItem = (FrameworkElement)sender;
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menuItem.Unloaded += MenuItem_Unloaded;
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var topLine = GetTopLine(menuItem);
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var popup = GetPopup(topLine);
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if (popup != null)
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{
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popup.Opened += Popup_Opened;
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}
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}
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private static void MenuItem_Unloaded(object sender, RoutedEventArgs e)
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{
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var menuItem = (FrameworkElement)sender;
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menuItem.Unloaded -= MenuItem_Unloaded;
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var topLine = GetTopLine(menuItem);
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var popup = GetPopup(topLine);
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if (popup != null)
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{
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popup.Opened -= Popup_Opened;
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}
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}
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private static void Popup_Opened(object sender, EventArgs e)
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{
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var popup = (Popup)sender;
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if (popup.TemplatedParent is MenuItem menuItem)
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{
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var topLine = GetTopLine(menuItem);
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if (topLine == null) return;
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topLine.HorizontalAlignment = HorizontalAlignment.Left;
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topLine.Width = menuItem.ActualWidth;
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topLine.Margin = new Thickness();
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var positionLeftTop = menuItem.PointToScreen(new Point());
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var positionRightBottom = menuItem.PointToScreen(new Point(menuItem.ActualWidth, menuItem.ActualHeight));
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ScreenHelper.FindMonitorRectsFromPoint(InteropMethods.GetCursorPos(), out _, out var workAreaRect);
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var panel = VisualHelper.GetParent<Panel>(topLine);
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if (positionLeftTop.X < 0)
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{
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topLine.Margin = new Thickness(positionLeftTop.X - panel.Margin.Left, 0, 0, 0);
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}
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else if (positionLeftTop.X + panel.ActualWidth > workAreaRect.Right)
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{
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var overflowWidth = positionRightBottom.X - workAreaRect.Right;
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if (overflowWidth > 0)
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{
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topLine.Width -= overflowWidth + panel.Margin.Right;
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}
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topLine.HorizontalAlignment = HorizontalAlignment.Left;
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topLine.Margin = new Thickness(positionLeftTop.X + panel.ActualWidth - workAreaRect.Right + panel.Margin.Right, 0, 0, 0);
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}
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if (positionRightBottom.Y > workAreaRect.Bottom)
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{
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topLine.Width = 0;
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topLine.HorizontalAlignment = HorizontalAlignment.Stretch;
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topLine.Margin = new Thickness();
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}
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}
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}
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public static void SetPopup(DependencyObject element, Popup value)
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=> element.SetValue(PopupProperty, value);
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public static Popup GetPopup(DependencyObject element)
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=> (Popup)element.GetValue(PopupProperty);
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internal static readonly DependencyProperty TopLineProperty = DependencyProperty.RegisterAttached(
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"TopLine", typeof(FrameworkElement), typeof(MenuTopLineAttach), new PropertyMetadata(default(FrameworkElement)));
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internal static void SetTopLine(DependencyObject element, FrameworkElement value)
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=> element.SetValue(TopLineProperty, value);
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internal static FrameworkElement GetTopLine(DependencyObject element)
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=> (FrameworkElement)element.GetValue(TopLineProperty);
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}
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}
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