private bool FilterAccessibleKeyboardEvents()

in src/settings-ui/Settings.UI/Controls/ShortcutControl/ShortcutControl.xaml.cs [177:239]
39 lines of code
32 McCabe index (conditional complexity)

        private bool FilterAccessibleKeyboardEvents(int key, UIntPtr extraInfo)
        {
            // A keyboard event sent with this value in the extra Information field should be ignored by the hook so that it can be captured by the system instead.
            if (extraInfo == ignoreKeyEventFlag)
            {
                return false;
            }

            // If the current key press is tab, based on the other keys ignore the key press so as to shift focus out of the hotkey control.
            if ((Windows.System.VirtualKey)key == Windows.System.VirtualKey.Tab)
            {
                // Shift was not pressed while entering and Shift is not pressed while leaving the hotkey control, treat it as a normal tab key press.
                if (!internalSettings.Shift && !_shiftKeyDownOnEntering && !internalSettings.Win && !internalSettings.Alt && !internalSettings.Ctrl)
                {
                    return false;
                }

                // Shift was not pressed while entering but it was pressed while leaving the hotkey, therefore simulate a shift key press as the system does not know about shift being pressed in the hotkey.
                else if (internalSettings.Shift && !_shiftKeyDownOnEntering && !internalSettings.Win && !internalSettings.Alt && !internalSettings.Ctrl)
                {
                    // This is to reset the shift key press within the control as it was not used within the control but rather was used to leave the hotkey.
                    internalSettings.Shift = false;

                    SendSingleKeyboardInput((short)Windows.System.VirtualKey.Shift, (uint)NativeKeyboardHelper.KeyEventF.KeyDown);

                    return false;
                }

                // Shift was pressed on entering and remained pressed, therefore only ignore the tab key so that it can be passed to the system.
                // As the shift key is already assumed to be pressed by the system while it entered the hotkey control, shift would still remain pressed, hence ignoring the tab input would simulate a Shift+Tab key press.
                else if (!internalSettings.Shift && _shiftKeyDownOnEntering && !_shiftToggled && !internalSettings.Win && !internalSettings.Alt && !internalSettings.Ctrl)
                {
                    return false;
                }

                // Shift was pressed on entering but it was released and later pressed again.
                // Ignore the tab key and the system already has the shift key pressed, therefore this would simulate Shift+Tab.
                // However, since the last shift key was only used to move out of the control, reset the status of shift within the control.
                else if (internalSettings.Shift && _shiftKeyDownOnEntering && _shiftToggled && !internalSettings.Win && !internalSettings.Alt && !internalSettings.Ctrl)
                {
                    internalSettings.Shift = false;

                    return false;
                }

                // Shift was pressed on entering and was later released.
                // The system still has shift in the key pressed status, therefore pass a Shift KeyUp message to the system, to release the shift key, therefore simulating only the Tab key press.
                else if (!internalSettings.Shift && _shiftKeyDownOnEntering && _shiftToggled && !internalSettings.Win && !internalSettings.Alt && !internalSettings.Ctrl)
                {
                    SendSingleKeyboardInput((short)Windows.System.VirtualKey.Shift, (uint)NativeKeyboardHelper.KeyEventF.KeyUp);

                    return false;
                }
            }

            // Either the cancel or save button has keyboard focus.
            if (FocusManager.GetFocusedElement(LayoutRoot.XamlRoot).GetType() == typeof(Button))
            {
                return false;
            }

            return true;
        }