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// Author: Gockner, Simon |
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// Created: 2021-04-06 |
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// Copyright(c) 2021 SimonG. All Rights Reserved. |
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using System; |
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using System.Collections.Generic; |
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using System.Drawing; |
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using Avalonia; |
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using Avalonia.Controls; |
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using Avalonia.Platform; |
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using Lib.NotifyIcon.Windows.Native; |
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using Lib.NotifyIcon.Windows.Native.Types; |
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using Point = Lib.NotifyIcon.Windows.Native.Types.Point; |
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namespace Lib.NotifyIcon.Windows |
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{ |
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public class NotifyIcon : INotifyIcon |
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{ |
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private static int _nextUId; |
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private readonly NotifyIconHelperWindow _helperWindow; |
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private readonly int _uId; |
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private bool _doubleClick; |
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private bool _iconAdded; |
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private Icon _icon; |
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private string _iconPath = ""; |
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private string _toolTipText = ""; |
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private bool _visible; |
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/// <summary> |
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/// Creates a new <see cref="NotifyIcon"/> instance and sets up some required resources |
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/// </summary> |
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public NotifyIcon() |
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{ |
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_uId = ++_nextUId; |
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_helperWindow = new NotifyIconHelperWindow(this); |
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} |
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~NotifyIcon() => UpdateIcon(remove: true); |
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/// <summary> |
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/// Gets or sets the path for the notify icon |
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/// </summary> |
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public string IconPath |
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{ |
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get => _iconPath; |
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set |
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{ |
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_iconPath = value; |
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IAssetLoader assetLoader = AvaloniaLocator.Current.GetService<IAssetLoader>(); |
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_icon = new Icon(assetLoader.Open(new Uri(_iconPath))); |
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UpdateIcon(); |
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} |
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} |
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/// <summary> |
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/// Gets or sets the tooltip text for the notify icon |
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/// </summary> |
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public string ToolTipText |
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{ |
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get => _toolTipText; |
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set |
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{ |
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_toolTipText = value; |
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UpdateIcon(); |
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} |
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} |
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/// <summary> |
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/// Gets or sets the context menu for the notify icon |
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/// </summary> |
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public ContextMenu ContextMenu { get; set; } |
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/// <summary> |
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/// Gets or sets if the notify icon is visible in the taskbar notification area or not |
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/// </summary> |
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public bool Visible |
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{ |
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get => _visible; |
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set |
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{ |
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_visible = value; |
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UpdateIcon(); |
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} |
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} |
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/// <summary> |
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/// Removes the notify icon from the taskbar notification area |
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/// </summary> |
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public void Remove() => UpdateIcon(true); |
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/// <summary> |
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/// Handles the NotifyIcon-specific window messages sent by the notification icon |
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/// </summary> |
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public void WndProc(IntPtr hWnd, uint msg, IntPtr wParam, IntPtr lParam) |
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{ |
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//We only care about tray icon messages |
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if (msg != (uint) CustomWindowsMessage.WmTrayMouse) |
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return; |
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//Determine the type of message and call the matching event handlers |
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switch (lParam.ToInt32()) |
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{ |
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case (int) WindowsMessage.WmLButtonUp: |
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{ |
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if (!_doubleClick) |
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Click?.Invoke(this, new EventArgs()); |
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_doubleClick = false; |
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break; |
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} |
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case (int) WindowsMessage.WmLButtonDblClk: |
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{ |
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DoubleClick?.Invoke(this, new EventArgs()); |
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_doubleClick = true; |
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break; |
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} |
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case (int) WindowsMessage.WmRButtonUp: |
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{ |
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EventArgs e = new EventArgs(); |
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RightClick?.Invoke(this, e); |
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ShowContextMenu(); |
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break; |
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} |
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} |
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} |
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/// <summary> |
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/// Shows, hides or removes the notify icon based on the set properties and parameters |
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/// </summary> |
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/// <param name="remove">If set to true, the notify icon will be removed</param> |
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private void UpdateIcon(bool remove = false) |
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{ |
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NotifyIconData iconData = new() |
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{ |
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hWnd = _helperWindow.Handle, |
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uID = _uId, |
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uFlags = NIF.Tip | NIF.Message, |
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uCallbackMessage = (int) CustomWindowsMessage.WmTrayMouse, |
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hIcon = IntPtr.Zero, |
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szTip = ToolTipText |
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}; |
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if (!remove && _icon != null && Visible) |
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{ |
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iconData.uFlags |= NIF.Icon; |
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iconData.hIcon = _icon.Handle; |
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if (!_iconAdded) |
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{ |
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WindowApi.Shell_NotifyIcon(NIM.Add, iconData); |
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_iconAdded = true; |
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} |
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else |
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WindowApi.Shell_NotifyIcon(NIM.Modify, iconData); |
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} |
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else |
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{ |
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WindowApi.Shell_NotifyIcon(NIM.Delete, iconData); |
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_iconAdded = false; |
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} |
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} |
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/// <summary> |
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/// If available, displays the notification icon's context menu |
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/// </summary> |
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private void ShowContextMenu() |
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{ |
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if (ContextMenu == null) |
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return; |
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// Since we can't use the Avalonia ContextMenu directly due to shortcomings |
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// regrading its positioning, we'll create a native context menu instead. |
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// This dictionary will map the menu item IDs which we'll need for the native |
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// menu to the MenuItems of the provided Avalonia ContextMenu. |
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Dictionary<uint, MenuItem> contextItemLookup = new(); |
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// Create a native (Win32) popup menu as the notify icon's context menu. |
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IntPtr popupMenu = WindowApi.CreatePopupMenu(); |
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uint i = 1; |
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foreach (var item in ContextMenu.Items) |
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{ |
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MenuItem menuItem = (MenuItem)item; |
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// Add items to the native context menu by simply reusing |
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// the information provided within the Avalonia ContextMenu. |
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WindowApi.AppendMenu(popupMenu, MenuFlags.MfString, i, (string) menuItem.Header); |
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// Add the mapping so that we can find the selected item later |
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contextItemLookup.Add(i, menuItem); |
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i++; |
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} |
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// To display a context menu for a notification icon, the current window |
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// must be the foreground window before the application calls TrackPopupMenu |
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// or TrackPopupMenuEx. Otherwise, the menu will not disappear when the user |
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// clicks outside of the menu or the window that created the menu (if it is |
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// visible). If the current window is a child window, you must set the |
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// (top-level) parent window as the foreground window. |
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WindowApi.SetForegroundWindow(_helperWindow.Handle); |
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// Get the mouse cursor position |
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WindowApi.GetCursorPos(out Point pt); |
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// Now display the context menu and block until we get a result |
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uint commandId = WindowApi.TrackPopupMenuEx(popupMenu, |
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UFlags.TpmBottomAlign | UFlags.TpmRightAlign | UFlags.TpmNoNotify | UFlags.TpmReturnCmd, |
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pt.X, pt.Y, _helperWindow.Handle, IntPtr.Zero); |
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// If we have a result, execute the corresponding command |
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if (commandId != 0) |
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contextItemLookup[commandId].Command?.Execute(null); |
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} |
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public event EventHandler<EventArgs> Click; |
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public event EventHandler<EventArgs> DoubleClick; |
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public event EventHandler<EventArgs> RightClick; |
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} |
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} |
