PowerToys/src/modules/MeasureTool/MeasureToolUI/MeasureToolXAML/MainWindow.xaml.cs

// Copyright (c) Microsoft Corporation
// The Microsoft Corporation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

using System;

using Microsoft.UI;
using Microsoft.UI.Windowing;
using Microsoft.UI.Xaml;
using Microsoft.UI.Xaml.Automation.Peers;
using Microsoft.UI.Xaml.Automation.Provider;
using Microsoft.UI.Xaml.Controls;
using Microsoft.UI.Xaml.Controls.Primitives;
using Microsoft.UI.Xaml.Input;
using Settings.UI.Library.Enumerations;
using Windows.Graphics;
using WinUIEx;

using static NativeMethods;

namespace MeasureToolUI
{
    /// <summary>
    /// An empty window that can be used on its own or navigated to within a Frame.
    /// </summary>
    public sealed partial class MainWindow : WindowEx, IDisposable
    {
        private const int WindowWidth = 216;
        private const int WindowHeight = 50;

        private readonly Settings settings = new();

        private PowerToys.MeasureToolCore.Core _coreLogic;

        private AppWindow _appWindow;
        private PointInt32 _initialPosition;

        protected override void OnPositionChanged(PointInt32 position)
        {
            _appWindow.Move(_initialPosition);
            this.SetWindowSize(WindowWidth, WindowHeight);
        }

        public MainWindow(PowerToys.MeasureToolCore.Core core)
        {
            InitializeComponent();

            var hwnd = WinRT.Interop.WindowNative.GetWindowHandle(this);
            WindowId windowId = Win32Interop.GetWindowIdFromWindow(hwnd);
            _appWindow = AppWindow.GetFromWindowId(windowId);
            SetWindowPos(hwnd, HWND_TOPMOST, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE | SWP_NOACTIVATE);
            var presenter = _appWindow.Presenter as OverlappedPresenter;
            presenter.IsAlwaysOnTop = true;
            this.SetIsAlwaysOnTop(true);
            this.SetIsShownInSwitchers(false);
            this.SetIsResizable(false);
            this.SetIsMinimizable(false);
            this.SetIsMaximizable(false);
            IsTitleBarVisible = false;

            // Remove the caption style from the window style. Windows App SDK 1.6 added it, which made the title bar and borders appear for Measure Tool. This code removes it.
            var windowStyle = GetWindowLong(hwnd, GWL_STYLE);
            windowStyle = windowStyle & (~WS_CAPTION);
            _ = SetWindowLong(hwnd, GWL_STYLE, windowStyle);

            _coreLogic = core;
            _coreLogic.InitResources();
            Closed += MainWindow_Closed;
            DisplayArea displayArea = DisplayArea.GetFromWindowId(windowId, DisplayAreaFallback.Nearest);
            float dpiScale = _coreLogic.GetDPIScaleForWindow((int)hwnd);

            _initialPosition = new PointInt32(displayArea.WorkArea.X + (displayArea.WorkArea.Width / 2) - (int)(dpiScale * WindowWidth / 2), displayArea.WorkArea.Y + (int)(dpiScale * 12));

            _coreLogic.SetToolbarBoundingBox(
                _initialPosition.X,
                _initialPosition.Y,
                _initialPosition.X + (int)(dpiScale * WindowWidth),
                _initialPosition.Y + (int)(dpiScale * WindowHeight));
            OnPositionChanged(_initialPosition);
            SetWindowPos(hwnd, HWND_TOPMOST, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE);
        }

        private void StackPanel_Loaded(object sender, RoutedEventArgs e)
        {
            SelectDefaultMeasureStyle();
        }

        private void MainWindow_Closed(object sender, WindowEventArgs args)
        {
            _coreLogic?.Dispose();
            _coreLogic = null;
        }

        private void UpdateToolUsageCompletionEvent(object sender)
        {
            _coreLogic.SetToolCompletionEvent(new PowerToys.MeasureToolCore.ToolSessionCompleted(() =>
            {
                DispatcherQueue.TryEnqueue(() =>
                {
                    ((ToggleButton)sender).IsChecked = false;
                });
            }));
        }

        private void UncheckOtherButtons(ToggleButton button)
        {
            var panel = button.Parent as Panel;
            foreach (var elem in panel.Children)
            {
                if (elem is ToggleButton otherButton)
                {
                    if (!button.Equals(otherButton))
                    {
                        otherButton.IsChecked = false;
                    }
                }
            }
        }

        private void HandleToolClick(object toolButton, Action startToolAction)
        {
            ToggleButton button = toolButton as ToggleButton;
            if (button == null)
            {
                return;
            }

            if (button.IsChecked.GetValueOrDefault())
            {
                UncheckOtherButtons(button);
                _coreLogic.ResetState();
                UpdateToolUsageCompletionEvent(toolButton);
                startToolAction();
            }
            else
            {
                _coreLogic.ResetState();
            }
        }

        private void BoundsTool_Click(object sender, RoutedEventArgs e)
        {
            HandleToolClick(sender, () => _coreLogic.StartBoundsTool());
        }

        private void MeasureTool_Click(object sender, RoutedEventArgs e)
        {
            HandleToolClick(sender, () => _coreLogic.StartMeasureTool(true, true));
        }

        private void HorizontalMeasureTool_Click(object sender, RoutedEventArgs e)
        {
            HandleToolClick(sender, () => _coreLogic.StartMeasureTool(true, false));
        }

        private void VerticalMeasureTool_Click(object sender, RoutedEventArgs e)
        {
            HandleToolClick(sender, () => _coreLogic.StartMeasureTool(false, true));
        }

        private void ClosePanelTool_Click(object sender, RoutedEventArgs e)
        {
            _coreLogic.ResetState();
            this.Close();
        }

        private void SelectDefaultMeasureStyle()
        {
            ToggleButton responsibleBtn = settings.DefaultMeasureStyle switch
            {
                MeasureToolMeasureStyle.None => null,
                MeasureToolMeasureStyle.Bounds => btnBounds,
                MeasureToolMeasureStyle.Spacing => btnSpacing,
                MeasureToolMeasureStyle.HorizontalSpacing => btnHorizontalSpacing,
                MeasureToolMeasureStyle.VerticalSpacing => btnVerticalSpacing,
                _ => null,
            };

            if (responsibleBtn is not null)
            {
                var peer = FrameworkElementAutomationPeer.FromElement(responsibleBtn) as ToggleButtonAutomationPeer;
                peer.Toggle();
            }
        }

        public void Dispose()
        {
            _coreLogic?.Dispose();
        }

        private void KeyboardAccelerator_Invoked(KeyboardAccelerator sender, KeyboardAcceleratorInvokedEventArgs args)
        {
            if (args.Element is ToggleButton toggle)
            {
                var peer = new ToggleButtonAutomationPeer(toggle);
                peer.Toggle();
                args.Handled = true;
            }
            else if (args.Element is Button button)
            {
                var peer = new ButtonAutomationPeer(button);
                if (peer.GetPattern(PatternInterface.Invoke) is IInvokeProvider provider)
                {
                    provider.Invoke();
                    args.Handled = true;
                }
            }
        }
    }
}