Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / AccessibleTech / longhorn / Automation / Win32Providers / MS / Internal / AutomationProxies / WindowsFormsHelpers.cs / 1 / WindowsFormsHelpers.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // // Description: // This proxy is the base class for all proxies that support Windows // Forms controls. // All generic Windows Forms functionality goes here. // // History: // 07/01/2003 : a-jeanp Created //--------------------------------------------------------------------------- using System; using System.Text; using System.Collections; using System.Windows.Automation; using System.Windows.Automation.Provider; using System.Runtime.InteropServices; using MS.Win32; namespace MS.Internal.AutomationProxies { // Helper static class used by the Win32 proxies to get Winforms information static class WindowsFormsHelper { #region Proxy Create // Static Create method called by UIAutomation to create proxies for Winforms controls. // returns null if unsuccessful internal static IRawElementProviderSimple Create(IntPtr hwnd, int idChild, int idObject) { // Currently there is an issue with CLR remoting that causes Accessible.CreateNativeFromEvent() to fail // for Winforms controls. Until that is resolved use AccessibleObjectFromWindow() instead. It will // return a Native IAccessble and not a OleAcc implementaion. Winforms does provide a Native IAccessible. Accessible acc = null; if (Accessible.AccessibleObjectFromWindow(hwnd, idObject, ref acc) != NativeMethods.S_OK || acc == null) { return null; } switch (acc.Role) { // =========================================================== // WinformsSpinner controls are not identifiable by classname or // other simple properties. The following case calls the // WinformsSpinner constructor which in turn tries to establish // the class of the control as a fact or returns null. case AccessibleRole.Combobox: return WinformsSpinner.Create( hwnd, idChild, idObject ); // =========================================================== case AccessibleRole.SpinButton: return WindowsUpDown.Create( hwnd, idChild, idObject ); case AccessibleRole.Grouping: return new WindowsButton(hwnd, null, WindowsButton.ButtonType.GroupBox, Misc.GetWindowStyle(hwnd) & NativeMethods.BS_TYPEMASK, acc); case AccessibleRole.StatusBar: WindowsStatusBar sb = new WindowsStatusBar(hwnd, null, 0, acc); if (sb == null) { return null; } return idChild == NativeMethods.CHILD_SELF ? sb : sb.CreateStatusBarPane(idChild); default: break; } return null; } // Static Create method called by UIAutomation to create a Button proxy for Winforms Buttons. // returns null if unsuccessful internal static IRawElementProviderSimple CreateButton(IntPtr hwnd) { // Currently there is an issue with CLR remoting that causes Accessible.CreateNativeFromEvent() to fail // for Winforms controls. Until that is resolved use AccessibleObjectFromWindow() instead. It will // return a Native IAccessble and not a OleAcc implementaion. Winforms does provide a Native IAccessible. Accessible acc = null; if (Accessible.AccessibleObjectFromWindow(hwnd, NativeMethods.OBJID_CLIENT, ref acc) != NativeMethods.S_OK || acc == null) { return null; } switch (acc.Role) { case AccessibleRole.CheckButton: return new WindowsButton(hwnd, null, WindowsButton.ButtonType.CheckBox, Misc.GetWindowStyle(hwnd) & NativeMethods.BS_TYPEMASK, acc); case AccessibleRole.Grouping: return new WindowsButton(hwnd, null, WindowsButton.ButtonType.GroupBox, Misc.GetWindowStyle(hwnd) & NativeMethods.BS_TYPEMASK, acc); case AccessibleRole.PushButton: return new WindowsButton(hwnd, null, WindowsButton.ButtonType.PushButton, Misc.GetWindowStyle(hwnd) & NativeMethods.BS_TYPEMASK, acc); case AccessibleRole.RadioButton: return new WindowsButton(hwnd, null, WindowsButton.ButtonType.RadioButton, Misc.GetWindowStyle(hwnd) & NativeMethods.BS_TYPEMASK, acc); default: break; } return null; } #endregion #region Internal Methods // ------------------------------------------------------ // // Internal Methods // // ----------------------------------------------------- // Checks if an hwnd is a winform. // Returns True/False if the hwnd is a winform. static internal FormControlState GetControlState(IntPtr hwnd) { return IsWindowsFormsControl(hwnd) ? FormControlState.True : FormControlState.False; } // Checks if an a class name is a winform classname. // Returns True/False if the classname is a winform. static internal bool IsWindowsFormsControl(string className) { return className.IndexOf(_WindowsFormsClassName, StringComparison.OrdinalIgnoreCase) > -1; } // Checks if an a class name is a winform classname. // Returns True/False if the classname is a winform. static internal bool IsWindowsFormsControl(IntPtr hwnd) { return IsWindowsFormsControl(Misc.GetClassName(hwnd)); } static internal bool IsWindowsFormsControl(IntPtr hwnd, ref FormControlState state) { if (state == FormControlState.Undeterminate) { state = GetControlState(hwnd); } return state == FormControlState.True ? true : false; } // The control name is the only real "Persistent" ID in Windows Forms static internal string WindowsFormsID(IntPtr hwnd) { return GetControlName(hwnd); } // Extract the internal Name property of the Windows Forms control using // the WM_GETCONTROLNAME message. static internal string GetControlName(IntPtr hwnd) { string winFormsID = ""; if (XSendMessage.XSend(hwnd, WM_GETCONTROLNAME, new IntPtr(Misc.MaxLengthNameProperty), ref winFormsID, Misc.MaxLengthNameProperty)) { return winFormsID; } return null; } #endregion #region Internal Fields // ------------------------------------------------------ // // Internal Fields // // ------------------------------------------------------ // The different states for figurating out if an hwnd is a winform. // Underminate implies value not set yet. Must call GetControlState, // otherwise the state is cached. internal enum FormControlState { Undeterminate, False, True, } #endregion #region Private Fields // ----------------------------------------------------- // // Private Fields // // ------------------------------------------------------ // Use this string to determine if this is a Windows Forms control or not private const string _WindowsFormsClassName = "windowsforms"; // Private Message to know the underlying name for a control private static int WM_GETCONTROLNAME = Misc.RegisterWindowMessage("WM_GETCONTROLNAME"); #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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