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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
// Description: Windows Hyperlink Proxy
using System;
using System.Runtime.InteropServices;
using System.ComponentModel;
using System.Text;
using System.Collections;
using System.Windows.Automation;
using System.Windows.Automation.Provider;
using System.Windows;
using MS.Win32;
namespace MS.Internal.AutomationProxies
{
// Implementation of the Hyperlink (SysLink) proxy.
class WindowsHyperlink: ProxyHwnd
{
// ------------------------------------------------------
//
// Constructors
//
// ------------------------------------------------------
#region Constructors
WindowsHyperlink (IntPtr hwnd, ProxyFragment parent, int item)
: base( hwnd, parent, item)
{
// Set the strings to return properly the properties.
_cControlType = ControlType.Hyperlink;
// support for events
_createOnEvent = new WinEventTracker.ProxyRaiseEvents(RaiseEvents);
}
#endregion Constructors
#region Proxy Create
// Static Create method called by UIAutomation to create this proxy.
// <returns null if unsuccessful
internal static IRawElementProviderSimple Create(IntPtr hwnd, int idChild, int idObject)
{
return Create(hwnd, idChild);
}
private static IRawElementProviderSimple Create(IntPtr hwnd, int idChild)
{
// (WindowsHyperlink UIA proxy isn't handling child elements in the SysLink control)
// Consider falling back to the native MSAA provider to support child elements of
// the SysLink control or implementing the code here to return back the child element.
// Narrator may need to be modified to work properly - to avoid reading the link text
// twice due to receiving focus change events for the outer text (which includes the
// link text) and a focus change for the link itself.
return new WindowsHyperlink(hwnd, null, idChild);
}
// Static Create method called by the event tracker system
internal static void RaiseEvents(IntPtr hwnd, int eventId, object idProp, int idObject, int idChild)
{
if (idObject != NativeMethods.OBJID_VSCROLL && idObject != NativeMethods.OBJID_HSCROLL)
{
ProxySimple wtv = new WindowsHyperlink(hwnd, null, idChild);
if (idProp == InvokePattern.InvokedEvent)
{
wtv = new WindowsHyperlinkItem(hwnd, (ProxyFragment)wtv, idChild);
}
wtv.DispatchEvents(eventId, idProp, idObject, idChild);
}
}
#endregion Proxy Create
// ------------------------------------------------------
//
// Patterns Implementation
//
// ------------------------------------------------------
#region ProxySimple Interface
// Gets the bounding rectangle for this element
internal override Rect BoundingRectangle
{
get
{
// ...otherwise, we need to determine the bounding rectangle
// for this node.
//
// How do I do that, given that there is no API
// to get the bounding rect for the embedded links? In
// fact, the individual links could flow across lines of
// text, so either their "bounding rect" could include parts
// of the screen outside the link itself, or they actually
// have several bouding rects.
//
// Right now we just return the bounding rect of the whole SysLink hwnd.
//
/*
BoundingRectangle = NativeMethods.Win32Rect.Empty;
return AutomationElement.NotSupported;
*/
return base.BoundingRectangle;
}
}
//Gets the localized name
internal override string LocalizedName
{
get
{
// ...then just return the window text...
return Misc.StripMnemonic(RemoveHTMLAnchorTag(Misc.ProxyGetText(_hwnd)));
}
}
#endregion ProxySimple Interface
#region ProxyHwnd Interface
// Builds a list of Win32 WinEvents to process a UIAutomation Event.
// Param name="idEvent", UIAuotmation event
// Param name="cEvent"out, number of winevent set in the array
// Returns an array of Events to Set. The number of valid entries in this array pass back in cEvent
protected override WinEventTracker.EvtIdProperty[] EventToWinEvent(AutomationEvent idEvent, out int cEvent)
{
if (idEvent == InvokePattern.InvokedEvent)
{
cEvent = 1;
return new WinEventTracker.EvtIdProperty[1] { new WinEventTracker.EvtIdProperty(NativeMethods.EventSystemCaptureEnd, idEvent) };
}
return base.EventToWinEvent(idEvent, out cEvent);
}
#endregion ProxyHwnd Interface
#region ProxyFragment Interface
// Returns the next sibling element in the raw hierarchy.
// Peripheral controls have always negative values.
// Returns null if no next child.
internal override ProxySimple GetNextSibling (ProxySimple child)
{
return GetLinkItem (child._item + 1) ? CreateHyperlinkItem (_linkItem, child._item + 1) : null;
}
// Returns the previous sibling element in the raw hierarchy.
// Peripheral controls have always negative values.
// Returns null is no previous.
internal override ProxySimple GetPreviousSibling (ProxySimple child)
{
return GetLinkItem (child._item - 1) ? CreateHyperlinkItem (_linkItem, child._item - 1) : null;
}
// Returns the first child element in the raw hierarchy.
internal override ProxySimple GetFirstChild ()
{
return GetLinkItem (0) ? CreateHyperlinkItem (_linkItem, 0) : null;
}
// Returns the last child element in the raw hierarchy.
internal override ProxySimple GetLastChild ()
{
//
// Is there a better way to do this?
//
// Keep trying to find elements until we fail,
// then assume that the prior one must have been the last.
//
int iLastItem = -2;
UnsafeNativeMethods.LITEM linkItemLast;
do
{
linkItemLast = _linkItem;
iLastItem++;
} while (GetLinkItem (iLastItem + 1));
return iLastItem < 0 ? CreateHyperlinkItem (linkItemLast, iLastItem + 1) : null;
}
// Returns a Proxy element corresponding to the specified
// screen coordinates.
internal override ProxySimple ElementProviderFromPoint (int x, int y)
{
//
// Send the link an LM_HITTEST message.
//
// Allocate a local hit test info struct.
UnsafeNativeMethods.LHITTESTINFO HitTestInfo = new UnsafeNativeMethods.LHITTESTINFO();
// Fill in the coordinates that we want to check.
HitTestInfo.pt.x = x;
HitTestInfo.pt.y = y;
// Convert screen coordinates to client coordinates.
if (!Misc.MapWindowPoints(IntPtr.Zero, _hwnd, ref HitTestInfo.pt, 1))
{
base.ElementProviderFromPoint(x, y);
}
// Fill in index and state info.
HitTestInfo.item.mask = NativeMethods.LIF_ITEMINDEX | NativeMethods.LIF_STATE;
HitTestInfo.item.iLink = 0;
HitTestInfo.item.stateMask = NativeMethods.LIS_ENABLED;
HitTestInfo.item.state = 0;
bool bGetItemResult;
unsafe
{
// Send the LM_HITTEST message.
bGetItemResult = XSendMessage.XSend(_hwnd, NativeMethods.LM_HITTEST, IntPtr.Zero, new IntPtr(&HitTestInfo), Marshal.SizeOf(HitTestInfo.GetType()));
}
if (bGetItemResult == true && HitTestInfo.item.iLink >= 0 && GetLinkItem (HitTestInfo.item.iLink))
{
return CreateHyperlinkItem (_linkItem, HitTestInfo.item.iLink);
}
return base.ElementProviderFromPoint (x, y);
}
// Returns an item corresponding to the focused element (if there is one),
// or null otherwise.
internal override ProxySimple GetFocus ()
{
//
// Is there a better way to do this?
//
// Keep trying to find elements until we fail,
//
for (int iCurrentItem = 0; GetLinkItem(iCurrentItem); iCurrentItem++)
{
// If the item was focused...
if (Misc.IsBitSet(_linkItem.state, NativeMethods.LIS_FOCUSED))
{
return CreateHyperlinkItem(_linkItem, iCurrentItem);
}
}
return null;
}
#endregion ProxyFragment Interface
// ------------------------------------------------------
//
// Private Methods
//
// ------------------------------------------------------
#region Private Methods
// Copy creator for a link or link item.
private ProxySimple CreateHyperlinkItem(UnsafeNativeMethods.LITEM linkItem, int index)
{
return new WindowsHyperlinkItem(_hwnd, this, index);
}
private bool GetLinkItem (int item)
{
if (item < 0)
{
return false;
}
// Set the members about which we care.
_linkItem.mask = NativeMethods.LIF_ITEMINDEX | NativeMethods.LIF_STATE;
_linkItem.iLink = item;
_linkItem.state = 0;
_linkItem.stateMask = NativeMethods.LIS_ENABLED;
unsafe
{
fixed (UnsafeNativeMethods.LITEM* pLinkItem = &_linkItem)
{
return XSendMessage.XSend(_hwnd, NativeMethods.LM_GETITEM, IntPtr.Zero, new IntPtr(pLinkItem), sizeof(UnsafeNativeMethods.LITEM));
}
}
}
private string RemoveHTMLAnchorTag(string text)
{
// If there are no anchor tag then it's ok just return it
if (text.IndexOf("<A", StringComparison.OrdinalIgnoreCase) < 0)
{
return text;
}
char[] ach = text.ToCharArray();
bool inAnchorMode = false;
int dest = 0;
for (int source = 0; source < ach.Length; source++)
{
if (!inAnchorMode)
{
if (source + 1 < ach.Length && ach[source] == '<' && (ach[source + 1] == 'A' || ach[source + 1] == 'a'))
{
inAnchorMode = true;
}
else if (source + 2 < ach.Length && ach[source] == '<' && ach[source + 1] == '/' && (ach[source + 2] == 'A' || ach[source + 2] == 'a'))
{
inAnchorMode = true;
}
else
{
ach[dest++] = ach[source];
}
}
else if (ach[source] == '>')
{
inAnchorMode = false;
}
}
return new string(ach, 0, dest);
}
#endregion Private Methods
// ------------------------------------------------------
//
// Private Fields
//
// ------------------------------------------------------
#region Private Fields
// Temporary variable used all over the proxy
private UnsafeNativeMethods.LITEM _linkItem;
#endregion Private Fields
}
// ------------------------------------------------------
//
// WindowsHyperlinkItem Class
//
//------------------------------------------------------
// Implementation of the PAW WindowsHyperlinkItem (SysLink) proxy.
class WindowsHyperlinkItem : ProxySimple, IInvokeProvider
{
// ------------------------------------------------------
//
// Constructors
//
// ------------------------------------------------------
#region Constructors
// Constructor.
internal WindowsHyperlinkItem(IntPtr hwnd, ProxyFragment parent, int item)
: base( hwnd, parent, item)
{
// Set the strings to return properly the properties.
_cControlType = ControlType.Hyperlink;
}
#endregion Constructors
//------------------------------------------------------
//
// Patterns Implementation
//
//------------------------------------------------------
#region ProxySimple Interface
// Returns a pattern interface if supported.
internal override object GetPatternProvider(AutomationPattern iid)
{
return iid == InvokePattern.Pattern ? this : null;
}
// Sets the focus to this item.
internal override bool SetFocus()
{
//
// Send the link an LM_SETITEM message.
//
// Allocate a local LITEM struct.
UnsafeNativeMethods.LITEM linkItem = new UnsafeNativeMethods.LITEM();
// Fill in the coordinates about which we care.
linkItem.mask = NativeMethods.LIF_ITEMINDEX | NativeMethods.LIF_STATE;
linkItem.iLink = _item;
linkItem.stateMask = NativeMethods.LIS_FOCUSED;
linkItem.state = NativeMethods.LIS_FOCUSED;
unsafe
{
// Send the LM_SETITEM message.
return XSendMessage.XSend(_hwnd, NativeMethods.LM_SETITEM, IntPtr.Zero, new IntPtr(&linkItem), Marshal.SizeOf(linkItem.GetType()));
}
}
//Gets the localized name
internal override string LocalizedName
{
get
{
// Cannot get the associated with each each hyperlink (within <A></A>)
return "";
}
}
#endregion ProxySimple Interface
#region Invoke Pattern
// Same as clicking on an hyperlink
void IInvokeProvider.Invoke()
{
// Check that button can be clicked.
//
// This state could change anytime.
//
// Make sure that the control is enabled
if (!SafeNativeMethods.IsWindowEnabled(_hwnd))
{
throw new ElementNotEnabledException();
}
if (!SafeNativeMethods.IsWindowVisible(_hwnd))
{
throw new InvalidOperationException(SR.OperationCannotBePerformed);
}
//
// Get the bounding rect for the window.
//
NativeMethods.Win32Rect BoundingRect = NativeMethods.Win32Rect.Empty;
if (!Misc.GetWindowRect(_hwnd, ref BoundingRect))
{
return;
}
//
// All we really need here are the height and the width,
// so we don't even need to translate between screen
// and client coordinates.
//
int width = BoundingRect.right - BoundingRect.left;
int height = BoundingRect.bottom - BoundingRect.top;
//
// Determine the point to click.
//
// We do this by scanning over the window's client
// region hit-testing until we find a point that
// corresponds to our link. We start out by scanning
// at a resolution of 10x10 pixels, starting from the
// window's (1,1) coordinate, then reducing the resolution
// if needed. Thus the idea here is to scan quickly if
// possible, but more thoroughly if absolutely necessary.
//
// Note:
// I intentionally started scanning points starting from
// (1,1) rather than from (0,0) just in case clicking the
// border of a control is different than clicking inside
// the border.
//
for (int Resolution = 10; Resolution > 0; --Resolution)
{
for (int x = 1; x <= width; x += Resolution)
{
for (int y = 1; y <= height; y += Resolution)
{
//
// Send the link an LM_HITTEST message.
//
// Allocate a local hit test info struct.
UnsafeNativeMethods.LHITTESTINFO HitTestInfo = new UnsafeNativeMethods.LHITTESTINFO();
// Fill in the coordinates that we want to check.
HitTestInfo.pt.x = x;
HitTestInfo.pt.y = y;
// Fill in index and state info.
HitTestInfo.item.mask = NativeMethods.LIF_ITEMINDEX | NativeMethods.LIF_STATE;
HitTestInfo.item.iLink = 0;
HitTestInfo.item.stateMask = NativeMethods.LIS_ENABLED;
HitTestInfo.item.state = 0;
bool bGetItemResult;
unsafe
{
// Send the LM_HITTEST message.
bGetItemResult = XSendMessage.XSend(_hwnd, NativeMethods.LM_HITTEST, IntPtr.Zero, new IntPtr(&HitTestInfo), Marshal.SizeOf(HitTestInfo.GetType()));
}
if (bGetItemResult == true && HitTestInfo.item.iLink == _item)
{
//
// N.B. [SEdmison]:
// This multiplication is essentially just
// a left shift by one word's width; in
// Win32 I'd just use my trusty MAKELONG macro,
// but C# doesn't give me that option.
//
Misc.ProxySendMessage(_hwnd, NativeMethods.WM_LBUTTONDOWN, IntPtr.Zero, NativeMethods.Util.MAKELPARAM(x, y));
Misc.ProxySendMessage(_hwnd, NativeMethods.WM_LBUTTONUP, IntPtr.Zero, NativeMethods.Util.MAKELPARAM(x, y));
return;
}
}
}
}
}
#endregion
}
}
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