Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / System / Windows / InterOp / HwndPanningFeedback.cs / 1305600 / HwndPanningFeedback.cs
//---------------------------------------------------------------------------- // // Copyright (C) Microsoft Corporation. All rights reserved. // //--------------------------------------------------------------------------- using System; using System.Diagnostics; using System.Runtime.InteropServices; using System.Security; using System.Windows.Interop; using System.Windows.Media; using System.Windows.Threading; using MS.Win32; namespace System.Windows.Interop { ////// Helper class to provide window feedback that panning has hit an edge. /// internal class HwndPanningFeedback { ////// Instantiates a new instance of this class. /// /// The HWND on which to provide feedback. ////// SecurityCritical: Accesses HwndSource. /// TreatAsSafe: Information is not given out. /// [SecurityCritical, SecurityTreatAsSafe] public HwndPanningFeedback(HwndSource hwndSource) { if (hwndSource == null) { throw new ArgumentNullException("hwndSource"); } _hwndSource = hwndSource; } private static bool IsSupported { get { return OperatingSystemVersionCheck.IsVersionOrLater(OperatingSystemVersion.Windows7); } } ////// Returns the handle of the current window. /// ////// SecurityCritical: Handles _hwndSource /// SecurityCritical: Handles and exposes HwndSource.Handle /// private HandleRef Handle { [SecurityCritical] get { if (_hwndSource != null) { IntPtr handle = _hwndSource.CriticalHandle; if (handle != IntPtr.Zero) { return new HandleRef(_hwndSource, handle); } } return new HandleRef(); } } ////// Moves the window by the offset. /// Used to provide feedback that panning has hit an edge. /// /// The total offset relative to the original location. /// Whether the edge was hit due to inertia or the user panning. ////// SecurityCritical: Changes the on-screen position of a window. /// SecurityCritical: Accesses Handle. /// [SecurityCritical] public void UpdatePanningFeedback(Vector totalOverpanOffset, bool inInertia) { if ((_hwndSource != null) && IsSupported) { if (!_isProvidingPanningFeedback) { _isProvidingPanningFeedback = UnsafeNativeMethods.BeginPanningFeedback(Handle); } if (_isProvidingPanningFeedback) { var deviceOffset = _hwndSource.TransformToDevice((Point)totalOverpanOffset); _deviceOffsetX = (int)deviceOffset.X; _deviceOffsetY = (int)deviceOffset.Y; _inInertia = inInertia; if (_updatePanningOperation == null) { _updatePanningOperation = _hwndSource.Dispatcher.BeginInvoke(DispatcherPriority.Background, new DispatcherOperationCallback(OnUpdatePanningFeedback), this); } } } } ////// SecurityCritical: Changes the on-screen position of a window. /// SecurityCritical: Accesses Handle. /// [SecurityCritical] private object OnUpdatePanningFeedback(object args) { HwndPanningFeedback panningFeedback = (HwndPanningFeedback)args; _updatePanningOperation = null; UnsafeNativeMethods.UpdatePanningFeedback(panningFeedback.Handle, panningFeedback._deviceOffsetX, panningFeedback._deviceOffsetY, panningFeedback._inInertia); return null; } private int _deviceOffsetX; private int _deviceOffsetY; private bool _inInertia; private DispatcherOperation _updatePanningOperation; ////// Moves the window back to its original position. /// Used to provide feedback that panning has hit an edge. /// /// Whether to animate or snap back to the original position ////// SecurityCritical: Changes the on-screen position of a window. /// SecurityCritical: Accesses _handle. /// TreatAsSafe: Returns the window to its original position, which is safe. /// [SecurityCritical, SecurityTreatAsSafe] public void EndPanningFeedback(bool animateBack) { if (_hwndSource != null && _isProvidingPanningFeedback) { _isProvidingPanningFeedback = false; if (_updatePanningOperation != null) { _updatePanningOperation.Abort(); _updatePanningOperation = null; } UnsafeNativeMethods.EndPanningFeedback(Handle, animateBack); } } ////// Whether panning feedback is currently in progress. /// private bool _isProvidingPanningFeedback; ////// The HwndSource being manipulated. /// ////// SecurityCritical: Access to the window. /// [SecurityCritical] private HwndSource _hwndSource; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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