ax_platform_node_textprovider_win.h

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// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
 
#ifndef UI_ACCESSIBILITY_PLATFORM_AX_PLATFORM_NODE_TEXTPROVIDER_WIN_H_
#define UI_ACCESSIBILITY_PLATFORM_AX_PLATFORM_NODE_TEXTPROVIDER_WIN_H_
 
#include <atlbase.h>
#include <atlcom.h>
 
#include <UIAutomationCore.h>
 
#include "ax/ax_node_position.h"
#include "ax/platform/ax_platform_node_win.h"
 
namespace ui {
 
class AX_EXPORT __declspec(uuid("3e1c192b-4348-45ac-8eb6-4b58eeb3dcca"))
    AXPlatformNodeTextProviderWin
    : public CComObjectRootEx<CComMultiThreadModel>,
      public ITextEditProvider {
 public:
  BEGIN_COM_MAP(AXPlatformNodeTextProviderWin)
  COM_INTERFACE_ENTRY(ITextProvider)
  COM_INTERFACE_ENTRY(ITextEditProvider)
  COM_INTERFACE_ENTRY(AXPlatformNodeTextProviderWin)
  END_COM_MAP()
 
  AXPlatformNodeTextProviderWin();
  ~AXPlatformNodeTextProviderWin();
 
  static AXPlatformNodeTextProviderWin* Create(AXPlatformNodeWin* owner);
  static void CreateIUnknown(AXPlatformNodeWin* owner, IUnknown** unknown);
 
  //
  // ITextProvider methods.
  //
 
  IFACEMETHODIMP GetSelection(SAFEARRAY** selection) override;
 
  IFACEMETHODIMP GetVisibleRanges(SAFEARRAY** visible_ranges) override;
 
  IFACEMETHODIMP RangeFromChild(IRawElementProviderSimple* child,
                                ITextRangeProvider** range) override;
 
  IFACEMETHODIMP RangeFromPoint(UiaPoint point,
                                ITextRangeProvider** range) override;
 
  IFACEMETHODIMP get_DocumentRange(ITextRangeProvider** range) override;
 
  IFACEMETHODIMP get_SupportedTextSelection(
      enum SupportedTextSelection* text_selection) override;
 
  //
  // ITextEditProvider methods.
  //
 
  IFACEMETHODIMP GetActiveComposition(ITextRangeProvider** range) override;
 
  IFACEMETHODIMP GetConversionTarget(ITextRangeProvider** range) override;
 
  // ITextProvider supporting methods.
 
  static ITextRangeProvider* GetRangeFromChild(
      ui::AXPlatformNodeWin* ancestor,
      ui::AXPlatformNodeWin* descendant);
 
  // Create a dengerate text range at the start of the specified node.
  static ITextRangeProvider* CreateDegenerateRangeAtStart(
      ui::AXPlatformNodeWin* node);
 
 private:
  friend class AXPlatformNodeTextProviderTest;
  ui::AXPlatformNodeWin* owner() const;
  HRESULT GetTextRangeProviderFromActiveComposition(ITextRangeProvider** range);
 
  Microsoft::WRL::ComPtr<ui::AXPlatformNodeWin> owner_;
};
 
}  // namespace ui
 
#endif  // UI_ACCESSIBILITY_PLATFORM_AX_PLATFORM_NODE_TEXTPROVIDER_WIN_H_