Merge IFWL and CFWL classes.

xfa/fwl/core/cfwl_listbox.cpp

Index: xfa/fwl/core/cfwl_listbox.cpp
diff --git a/xfa/fwl/core/cfwl_listbox.cpp b/xfa/fwl/core/cfwl_listbox.cpp
index 784bf24de898be8fb615de5cf4b9b8743c0aa9ba..6c30cde3496661b161b85f9eca85ceb1221edce7 100644
--- a/xfa/fwl/core/cfwl_listbox.cpp
+++ b/xfa/fwl/core/cfwl_listbox.cpp
@@ -6,60 +6,1123 @@
 
 #include "xfa/fwl/core/cfwl_listbox.h"
 
+#include <algorithm>
 #include <memory>
 #include <utility>
 
 #include "third_party/base/ptr_util.h"
 #include "third_party/base/stl_util.h"
-#include "xfa/fwl/core/ifwl_listbox.h"
+#include "xfa/fde/tto/fde_textout.h"
+#include "xfa/fwl/core/cfwl_app.h"
+#include "xfa/fwl/core/cfwl_msgkey.h"
+#include "xfa/fwl/core/cfwl_msgmouse.h"
+#include "xfa/fwl/core/cfwl_msgmousewheel.h"
+#include "xfa/fwl/core/cfwl_themebackground.h"
+#include "xfa/fwl/core/cfwl_themepart.h"
+#include "xfa/fwl/core/cfwl_themetext.h"
+#include "xfa/fwl/core/ifwl_themeprovider.h"
 
 namespace {
 
-IFWL_ListBox* ToListBox(IFWL_Widget* widget) {
-  return static_cast<IFWL_ListBox*>(widget);
-}
+const int kItemTextMargin = 2;
 
 }  // namespace
 
-CFWL_ListBox::CFWL_ListBox(const CFWL_App* app) : CFWL_Widget(app) {}
+CFWL_ListBox::CFWL_ListBox(const CFWL_App* app,
+                           std::unique_ptr<CFWL_WidgetProperties> properties,
+                           CFWL_Widget* pOuter)
+    : CFWL_Widget(app, std::move(properties), pOuter),
+      m_dwTTOStyles(0),
+      m_iTTOAligns(0),
+      m_hAnchor(nullptr),
+      m_fScorllBarWidth(0),
+      m_bLButtonDown(false),
+      m_pScrollBarTP(nullptr) {
+  m_rtClient.Reset();
+  m_rtConent.Reset();
+  m_rtStatic.Reset();
+}
 
 CFWL_ListBox::~CFWL_ListBox() {}
 
-void CFWL_ListBox::Initialize() {
-  ASSERT(!m_pIface);
+FWL_Type CFWL_ListBox::GetClassID() const {
+  return FWL_Type::ListBox;
+}
+
+void CFWL_ListBox::GetWidgetRect(CFX_RectF& rect, bool bAutoSize) {
+  if (!bAutoSize) {
+    rect = m_pProperties->m_rtWidget;
+    return;
+  }
 
-  m_pIface = pdfium::MakeUnique<IFWL_ListBox>(
-      m_pApp, pdfium::MakeUnique<CFWL_WidgetProperties>(), nullptr);
+  rect.Set(0, 0, 0, 0);
+  if (!m_pProperties->m_pThemeProvider)
+    m_pProperties->m_pThemeProvider = GetAvailableTheme();
 
-  CFWL_Widget::Initialize();
+  CFX_SizeF fs = CalcSize(true);
+  rect.Set(0, 0, fs.x, fs.y);
+  CFWL_Widget::GetWidgetRect(rect, true);
 }
 
-CFWL_ListItem* CFWL_ListBox::GetItem(const IFWL_Widget* pWidget,
-                                     int32_t nIndex) const {
-  return GetWidget() ? ToListBox(GetWidget())->GetItem(pWidget, nIndex)
-                     : nullptr;
+void CFWL_ListBox::Update() {
+  if (IsLocked())
+    return;
+  if (!m_pProperties->m_pThemeProvider)
+    m_pProperties->m_pThemeProvider = GetAvailableTheme();
+
+  switch (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_LTB_AlignMask) {
+    case FWL_STYLEEXT_LTB_LeftAlign: {
+      m_iTTOAligns = FDE_TTOALIGNMENT_CenterLeft;
+      break;
+    }
+    case FWL_STYLEEXT_LTB_RightAlign: {
+      m_iTTOAligns = FDE_TTOALIGNMENT_CenterRight;
+      break;
+    }
+    case FWL_STYLEEXT_LTB_CenterAlign:
+    default: {
+      m_iTTOAligns = FDE_TTOALIGNMENT_Center;
+      break;
+    }
+  }
+  if (m_pProperties->m_dwStyleExes & FWL_WGTSTYLE_RTLReading)
+    m_dwTTOStyles |= FDE_TTOSTYLE_RTL;
+
+  m_dwTTOStyles |= FDE_TTOSTYLE_SingleLine;
+  m_fScorllBarWidth = GetScrollWidth();
+  CalcSize();
+}
+
+FWL_WidgetHit CFWL_ListBox::HitTest(FX_FLOAT fx, FX_FLOAT fy) {
+  if (IsShowScrollBar(false)) {
+    CFX_RectF rect;
+    m_pHorzScrollBar->GetWidgetRect(rect);
+    if (rect.Contains(fx, fy))
+      return FWL_WidgetHit::HScrollBar;
+  }
+  if (IsShowScrollBar(true)) {
+    CFX_RectF rect;
+    m_pVertScrollBar->GetWidgetRect(rect);
+    if (rect.Contains(fx, fy))
+      return FWL_WidgetHit::VScrollBar;
+  }
+  if (m_rtClient.Contains(fx, fy))
+    return FWL_WidgetHit::Client;
+  return FWL_WidgetHit::Unknown;
+}
+
+void CFWL_ListBox::DrawWidget(CFX_Graphics* pGraphics,
+                              const CFX_Matrix* pMatrix) {
+  if (!pGraphics)
+    return;
+  if (!m_pProperties->m_pThemeProvider)
+    return;
+
+  IFWL_ThemeProvider* pTheme = m_pProperties->m_pThemeProvider;
+  pGraphics->SaveGraphState();
+  if (HasBorder())
+    DrawBorder(pGraphics, CFWL_Part::Border, pTheme, pMatrix);
+  if (HasEdge())
+    DrawEdge(pGraphics, CFWL_Part::Edge, pTheme, pMatrix);
+
+  CFX_RectF rtClip(m_rtConent);
+  if (IsShowScrollBar(false))
+    rtClip.height -= m_fScorllBarWidth;
+  if (IsShowScrollBar(true))
+    rtClip.width -= m_fScorllBarWidth;
+  if (pMatrix)
+    pMatrix->TransformRect(rtClip);
+
+  pGraphics->SetClipRect(rtClip);
+  if ((m_pProperties->m_dwStyles & FWL_WGTSTYLE_NoBackground) == 0)
+    DrawBkground(pGraphics, pTheme, pMatrix);
+
+  DrawItems(pGraphics, pTheme, pMatrix);
+  pGraphics->RestoreGraphState();
+}
+
+void CFWL_ListBox::SetThemeProvider(IFWL_ThemeProvider* pThemeProvider) {
+  if (pThemeProvider)
+    m_pProperties->m_pThemeProvider = pThemeProvider;
+}
+
+int32_t CFWL_ListBox::CountSelItems() {
+  int32_t iRet = 0;
+  int32_t iCount = CountItems(this);
+  for (int32_t i = 0; i < iCount; i++) {
+    CFWL_ListItem* pItem = GetItem(this, i);
+    if (!pItem)
+      continue;
+
+    uint32_t dwStyle = GetItemStyles(this, pItem);
+    if (dwStyle & FWL_ITEMSTATE_LTB_Selected)
+      iRet++;
+  }
+  return iRet;
+}
+
+CFWL_ListItem* CFWL_ListBox::GetSelItem(int32_t nIndexSel) {
+  int32_t idx = GetSelIndex(nIndexSel);
+  if (idx < 0)
+    return nullptr;
+  return GetItem(this, idx);
+}
+
+int32_t CFWL_ListBox::GetSelIndex(int32_t nIndex) {
+  int32_t index = 0;
+  int32_t iCount = CountItems(this);
+  for (int32_t i = 0; i < iCount; i++) {
+    CFWL_ListItem* pItem = GetItem(this, i);
+    if (!pItem)
+      return -1;
+
+    uint32_t dwStyle = GetItemStyles(this, pItem);
+    if (dwStyle & FWL_ITEMSTATE_LTB_Selected) {
+      if (index == nIndex)
+        return i;
+      index++;
+    }
+  }
+  return -1;
+}
+
+void CFWL_ListBox::SetSelItem(CFWL_ListItem* pItem, bool bSelect) {
+  if (!pItem) {
+    if (bSelect) {
+      SelectAll();
+    } else {
+      ClearSelection();
+      SetFocusItem(nullptr);
+    }
+    return;
+  }
+  if (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_LTB_MultiSelection)
+    SetSelectionDirect(pItem, bSelect);
+  else
+    SetSelection(pItem, pItem, bSelect);
+}
+
+void CFWL_ListBox::GetDataProviderItemText(CFWL_ListItem* pItem,
+                                           CFX_WideString& wsText) {
+  if (!pItem)
+    return;
+  GetItemText(this, pItem, wsText);
+}
+
+CFWL_ListItem* CFWL_ListBox::GetListItem(CFWL_ListItem* pItem,
+                                         uint32_t dwKeyCode) {
+  CFWL_ListItem* hRet = nullptr;
+  switch (dwKeyCode) {
+    case FWL_VKEY_Up:
+    case FWL_VKEY_Down:
+    case FWL_VKEY_Home:
+    case FWL_VKEY_End: {
+      const bool bUp = dwKeyCode == FWL_VKEY_Up;
+      const bool bDown = dwKeyCode == FWL_VKEY_Down;
+      const bool bHome = dwKeyCode == FWL_VKEY_Home;
+      int32_t iDstItem = -1;
+      if (bUp || bDown) {
+        int32_t index = GetItemIndex(this, pItem);
+        iDstItem = dwKeyCode == FWL_VKEY_Up ? index - 1 : index + 1;
+      } else if (bHome) {
+        iDstItem = 0;
+      } else {
+        int32_t iCount = CountItems(this);
+        iDstItem = iCount - 1;
+      }
+      hRet = GetItem(this, iDstItem);
+      break;
+    }
+    default:
+      break;
+  }
+  return hRet;
+}
+
+void CFWL_ListBox::SetSelection(CFWL_ListItem* hStart,
+                                CFWL_ListItem* hEnd,
+                                bool bSelected) {
+  int32_t iStart = GetItemIndex(this, hStart);
+  int32_t iEnd = GetItemIndex(this, hEnd);
+  if (iStart > iEnd) {
+    int32_t iTemp = iStart;
+    iStart = iEnd;
+    iEnd = iTemp;
+  }
+  if (bSelected) {
+    int32_t iCount = CountItems(this);
+    for (int32_t i = 0; i < iCount; i++) {
+      CFWL_ListItem* pItem = GetItem(this, i);
+      SetSelectionDirect(pItem, false);
+    }
+  }
+  for (; iStart <= iEnd; iStart++) {
+    CFWL_ListItem* pItem = GetItem(this, iStart);
+    SetSelectionDirect(pItem, bSelected);
+  }
+}
+
+void CFWL_ListBox::SetSelectionDirect(CFWL_ListItem* pItem, bool bSelect) {
+  uint32_t dwOldStyle = GetItemStyles(this, pItem);
+  bSelect ? dwOldStyle |= FWL_ITEMSTATE_LTB_Selected
+          : dwOldStyle &= ~FWL_ITEMSTATE_LTB_Selected;
+  SetItemStyles(this, pItem, dwOldStyle);
+}
+
+bool CFWL_ListBox::IsItemSelected(CFWL_ListItem* pItem) {
+  uint32_t dwState = GetItemStyles(this, pItem);
+  return (dwState & FWL_ITEMSTATE_LTB_Selected) != 0;
+}
+
+void CFWL_ListBox::ClearSelection() {
+  bool bMulti = m_pProperties->m_dwStyleExes & FWL_STYLEEXT_LTB_MultiSelection;
+  int32_t iCount = CountItems(this);
+  for (int32_t i = 0; i < iCount; i++) {
+    CFWL_ListItem* pItem = GetItem(this, i);
+    uint32_t dwState = GetItemStyles(this, pItem);
+    if (!(dwState & FWL_ITEMSTATE_LTB_Selected))
+      continue;
+    SetSelectionDirect(pItem, false);
+    if (!bMulti)
+      return;
+  }
+}
+
+void CFWL_ListBox::SelectAll() {
+  if (!m_pProperties->m_dwStyleExes & FWL_STYLEEXT_LTB_MultiSelection)
+    return;
+
+  int32_t iCount = CountItems(this);
+  if (iCount <= 0)
+    return;
+
+  CFWL_ListItem* pItemStart = GetItem(this, 0);
+  CFWL_ListItem* pItemEnd = GetItem(this, iCount - 1);
+  SetSelection(pItemStart, pItemEnd, false);
+}
+
+CFWL_ListItem* CFWL_ListBox::GetFocusedItem() {
+  int32_t iCount = CountItems(this);
+  for (int32_t i = 0; i < iCount; i++) {
+    CFWL_ListItem* pItem = GetItem(this, i);
+    if (!pItem)
+      return nullptr;
+    if (GetItemStyles(this, pItem) & FWL_ITEMSTATE_LTB_Focused)
+      return pItem;
+  }
+  return nullptr;
 }
 
-void CFWL_ListBox::GetItemText(IFWL_Widget* pWidget,
+void CFWL_ListBox::SetFocusItem(CFWL_ListItem* pItem) {
+  CFWL_ListItem* hFocus = GetFocusedItem();
+  if (pItem == hFocus)
+    return;
+
+  if (hFocus) {
+    uint32_t dwStyle = GetItemStyles(this, hFocus);
+    dwStyle &= ~FWL_ITEMSTATE_LTB_Focused;
+    SetItemStyles(this, hFocus, dwStyle);
+  }
+  if (pItem) {
+    uint32_t dwStyle = GetItemStyles(this, pItem);
+    dwStyle |= FWL_ITEMSTATE_LTB_Focused;
+    SetItemStyles(this, pItem, dwStyle);
+  }
+}
+
+CFWL_ListItem* CFWL_ListBox::GetItemAtPoint(FX_FLOAT fx, FX_FLOAT fy) {
+  fx -= m_rtConent.left, fy -= m_rtConent.top;
+  FX_FLOAT fPosX = 0.0f;
+  if (m_pHorzScrollBar)
+    fPosX = m_pHorzScrollBar->GetPos();
+
+  FX_FLOAT fPosY = 0.0;
+  if (m_pVertScrollBar)
+    fPosY = m_pVertScrollBar->GetPos();
+
+  int32_t nCount = CountItems(this);
+  for (int32_t i = 0; i < nCount; i++) {
+    CFWL_ListItem* pItem = GetItem(this, i);
+    if (!pItem)
+      continue;
+
+    CFX_RectF rtItem;
+    GetItemRect(this, pItem, rtItem);
+    rtItem.Offset(-fPosX, -fPosY);
+    if (rtItem.Contains(fx, fy))
+      return pItem;
+  }
+  return nullptr;
+}
+
+bool CFWL_ListBox::GetItemCheckRectInternal(CFWL_ListItem* pItem,
+                                            CFX_RectF& rtCheck) {
+  if (!(m_pProperties->m_dwStyleExes & FWL_STYLEEXT_LTB_Check))
+    return false;
+  GetItemCheckRect(this, pItem, rtCheck);
+  return true;
+}
+
+bool CFWL_ListBox::GetItemChecked(CFWL_ListItem* pItem) {
+  if (!(m_pProperties->m_dwStyleExes & FWL_STYLEEXT_LTB_Check))
+    return false;
+  return !!(GetItemCheckState(this, pItem) & FWL_ITEMSTATE_LTB_Checked);
+}
+
+bool CFWL_ListBox::SetItemChecked(CFWL_ListItem* pItem, bool bChecked) {
+  if (!(m_pProperties->m_dwStyleExes & FWL_STYLEEXT_LTB_Check))
+    return false;
+
+  SetItemCheckState(this, pItem, bChecked ? FWL_ITEMSTATE_LTB_Checked : 0);
+  return true;
+}
+
+bool CFWL_ListBox::ScrollToVisible(CFWL_ListItem* pItem) {
+  if (!m_pVertScrollBar)
+    return false;
+
+  CFX_RectF rtItem;
+  GetItemRect(this, pItem, rtItem);
+
+  bool bScroll = false;
+  FX_FLOAT fPosY = m_pVertScrollBar->GetPos();
+  rtItem.Offset(0, -fPosY + m_rtConent.top);
+  if (rtItem.top < m_rtConent.top) {
+    fPosY += rtItem.top - m_rtConent.top;
+    bScroll = true;
+  } else if (rtItem.bottom() > m_rtConent.bottom()) {
+    fPosY += rtItem.bottom() - m_rtConent.bottom();
+    bScroll = true;
+  }
+  if (!bScroll)
+    return false;
+
+  m_pVertScrollBar->SetPos(fPosY);
+  m_pVertScrollBar->SetTrackPos(fPosY);
+  Repaint(&m_rtClient);
+  return true;
+}
+
+void CFWL_ListBox::DrawBkground(CFX_Graphics* pGraphics,
+                                IFWL_ThemeProvider* pTheme,
+                                const CFX_Matrix* pMatrix) {
+  if (!pGraphics)
+    return;
+  if (!pTheme)
+    return;
+
+  CFWL_ThemeBackground param;
+  param.m_pWidget = this;
+  param.m_iPart = CFWL_Part::Background;
+  param.m_dwStates = 0;
+  param.m_pGraphics = pGraphics;
+  param.m_matrix.Concat(*pMatrix);
+  param.m_rtPart = m_rtClient;
+  if (IsShowScrollBar(false) && IsShowScrollBar(true))
+    param.m_pData = &m_rtStatic;
+  if (!IsEnabled())
+    param.m_dwStates = CFWL_PartState_Disabled;
+
+  pTheme->DrawBackground(&param);
+}
+
+void CFWL_ListBox::DrawItems(CFX_Graphics* pGraphics,
+                             IFWL_ThemeProvider* pTheme,
+                             const CFX_Matrix* pMatrix) {
+  FX_FLOAT fPosX = 0.0f;
+  if (m_pHorzScrollBar)
+    fPosX = m_pHorzScrollBar->GetPos();
+
+  FX_FLOAT fPosY = 0.0f;
+  if (m_pVertScrollBar)
+    fPosY = m_pVertScrollBar->GetPos();
+
+  CFX_RectF rtView(m_rtConent);
+  if (m_pHorzScrollBar)
+    rtView.height -= m_fScorllBarWidth;
+  if (m_pVertScrollBar)
+    rtView.width -= m_fScorllBarWidth;
+
+  bool bMultiCol =
+      !!(m_pProperties->m_dwStyleExes & FWL_STYLEEXT_LTB_MultiColumn);
+  int32_t iCount = CountItems(this);
+  for (int32_t i = 0; i < iCount; i++) {
+    CFWL_ListItem* pItem = GetItem(this, i);
+    if (!pItem)
+      continue;
+
+    CFX_RectF rtItem;
+    GetItemRect(this, pItem, rtItem);
+    rtItem.Offset(m_rtConent.left - fPosX, m_rtConent.top - fPosY);
+    if (rtItem.bottom() < m_rtConent.top)
+      continue;
+    if (rtItem.top >= m_rtConent.bottom())
+      break;
+    if (bMultiCol && rtItem.left > m_rtConent.right())
+      break;
+
+    if (!(GetStylesEx() & FWL_STYLEEXT_LTB_OwnerDraw))
+      DrawItem(pGraphics, pTheme, pItem, i, rtItem, pMatrix);
+  }
+}
+
+void CFWL_ListBox::DrawItem(CFX_Graphics* pGraphics,
+                            IFWL_ThemeProvider* pTheme,
+                            CFWL_ListItem* pItem,
+                            int32_t Index,
+                            const CFX_RectF& rtItem,
+                            const CFX_Matrix* pMatrix) {
+  uint32_t dwItemStyles = GetItemStyles(this, pItem);
+  uint32_t dwPartStates = CFWL_PartState_Normal;
+  if (m_pProperties->m_dwStates & FWL_WGTSTATE_Disabled)
+    dwPartStates = CFWL_PartState_Disabled;
+  else if (dwItemStyles & FWL_ITEMSTATE_LTB_Selected)
+    dwPartStates = CFWL_PartState_Selected;
+
+  if (m_pProperties->m_dwStates & FWL_WGTSTATE_Focused &&
+      dwItemStyles & FWL_ITEMSTATE_LTB_Focused) {
+    dwPartStates |= CFWL_PartState_Focused;
+  }
+
+  CFWL_ThemeBackground bg_param;
+  bg_param.m_pWidget = this;
+  bg_param.m_iPart = CFWL_Part::ListItem;
+  bg_param.m_dwStates = dwPartStates;
+  bg_param.m_pGraphics = pGraphics;
+  bg_param.m_matrix.Concat(*pMatrix);
+  bg_param.m_rtPart = rtItem;
+  bg_param.m_bMaximize = true;
+  CFX_RectF rtFocus(rtItem);
+  bg_param.m_pData = &rtFocus;
+  if (m_pVertScrollBar && !m_pHorzScrollBar &&
+      (dwPartStates & CFWL_PartState_Focused)) {
+    bg_param.m_rtPart.left += 1;
+    bg_param.m_rtPart.width -= (m_fScorllBarWidth + 1);
+    rtFocus.Deflate(0.5, 0.5, 1 + m_fScorllBarWidth, 1);
+  }
+  pTheme->DrawBackground(&bg_param);
+
+  bool bHasIcon = !!(GetStylesEx() & FWL_STYLEEXT_LTB_Icon);
+  if (bHasIcon) {
+    CFX_RectF rtDIB;
+    CFX_DIBitmap* pDib = GetItemIcon(this, pItem);
+    rtDIB.Set(rtItem.left, rtItem.top, rtItem.height, rtItem.height);
+    if (pDib) {
+      CFWL_ThemeBackground param;
+      param.m_pWidget = this;
+      param.m_iPart = CFWL_Part::Icon;
+      param.m_pGraphics = pGraphics;
+      param.m_matrix.Concat(*pMatrix);
+      param.m_rtPart = rtDIB;
+      param.m_bMaximize = true;
+      param.m_pImage = pDib;
+      pTheme->DrawBackground(&param);
+    }
+  }
+
+  bool bHasCheck = !!(GetStylesEx() & FWL_STYLEEXT_LTB_Check);
+  if (bHasCheck) {
+    CFX_RectF rtCheck;
+    rtCheck.Set(rtItem.left, rtItem.top, rtItem.height, rtItem.height);
+    rtCheck.Deflate(2, 2, 2, 2);
+    SetItemCheckRect(this, pItem, rtCheck);
+    CFWL_ThemeBackground param;
+    param.m_pWidget = this;
+    param.m_iPart = CFWL_Part::Check;
+    param.m_pGraphics = pGraphics;
+    if (GetItemChecked(pItem))
+      param.m_dwStates = CFWL_PartState_Checked;
+    else
+      param.m_dwStates = CFWL_PartState_Normal;
+    param.m_matrix.Concat(*pMatrix);
+    param.m_rtPart = rtCheck;
+    param.m_bMaximize = true;
+    pTheme->DrawBackground(&param);
+  }
+
+  CFX_WideString wsText;
+  GetItemText(this, pItem, wsText);
+  if (wsText.GetLength() <= 0)
+    return;
+
+  CFX_RectF rtText(rtItem);
+  rtText.Deflate(kItemTextMargin, kItemTextMargin);
+  if (bHasIcon || bHasCheck)
+    rtText.Deflate(rtItem.height, 0, 0, 0);
+
+  CFWL_ThemeText textParam;
+  textParam.m_pWidget = this;
+  textParam.m_iPart = CFWL_Part::ListItem;
+  textParam.m_dwStates = dwPartStates;
+  textParam.m_pGraphics = pGraphics;
+  textParam.m_matrix.Concat(*pMatrix);
+  textParam.m_rtPart = rtText;
+  textParam.m_wsText = wsText;
+  textParam.m_dwTTOStyles = m_dwTTOStyles;
+  textParam.m_iTTOAlign = m_iTTOAligns;
+  textParam.m_bMaximize = true;
+  pTheme->DrawText(&textParam);
+}
+
+CFX_SizeF CFWL_ListBox::CalcSize(bool bAutoSize) {
+  CFX_SizeF fs;
+  if (!m_pProperties->m_pThemeProvider)
+    return fs;
+
+  GetClientRect(m_rtClient);
+  m_rtConent = m_rtClient;
+  CFX_RectF rtUIMargin;
+  rtUIMargin.Set(0, 0, 0, 0);
+  if (!m_pOuter) {
+    CFX_RectF* pUIMargin = static_cast<CFX_RectF*>(
+        GetThemeCapacity(CFWL_WidgetCapacity::UIMargin));
+    if (pUIMargin) {
+      m_rtConent.Deflate(pUIMargin->left, pUIMargin->top, pUIMargin->width,
+                         pUIMargin->height);
+    }
+  }
+
+  FX_FLOAT fWidth = GetMaxTextWidth();
+  fWidth += 2 * kItemTextMargin;
+  if (!bAutoSize) {
+    FX_FLOAT fActualWidth =
+        m_rtClient.width - rtUIMargin.left - rtUIMargin.width;
+    fWidth = std::max(fWidth, fActualWidth);
+  }
+
+  m_fItemHeight = CalcItemHeight();
+  if ((GetStylesEx() & FWL_STYLEEXT_LTB_Icon))
+    fWidth += m_fItemHeight;
+
+  int32_t iCount = CountItems(this);
+  for (int32_t i = 0; i < iCount; i++) {
+    CFWL_ListItem* htem = GetItem(this, i);
+    GetItemSize(fs, htem, fWidth, m_fItemHeight, bAutoSize);
+  }
+  if (bAutoSize)
+    return fs;
+
+  FX_FLOAT iWidth = m_rtClient.width - rtUIMargin.left - rtUIMargin.width;
+  FX_FLOAT iHeight = m_rtClient.height;
+  bool bShowVertScr =
+      (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_LTB_ShowScrollBarAlaways) &&
+      (m_pProperties->m_dwStyles & FWL_WGTSTYLE_VScroll);
+  bool bShowHorzScr =
+      (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_LTB_ShowScrollBarAlaways) &&
+      (m_pProperties->m_dwStyles & FWL_WGTSTYLE_HScroll);
+  if (!bShowVertScr && m_pProperties->m_dwStyles & FWL_WGTSTYLE_VScroll &&
+      (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_LTB_MultiColumn) == 0) {
+    bShowVertScr = (fs.y > iHeight);
+  }
+  if (!bShowHorzScr && m_pProperties->m_dwStyles & FWL_WGTSTYLE_HScroll)
+    bShowHorzScr = (fs.x > iWidth);
+
+  CFX_SizeF szRange;
+  if (bShowVertScr) {
+    if (!m_pVertScrollBar)
+      InitScrollBar();
+
+    CFX_RectF rtScrollBar;
+    rtScrollBar.Set(m_rtClient.right() - m_fScorllBarWidth, m_rtClient.top,
+                    m_fScorllBarWidth, m_rtClient.height - 1);
+    if (bShowHorzScr)
+      rtScrollBar.height -= m_fScorllBarWidth;
+
+    m_pVertScrollBar->SetWidgetRect(rtScrollBar);
+    szRange.x = 0, szRange.y = fs.y - m_rtConent.height;
+    szRange.y = std::max(szRange.y, m_fItemHeight);
+
+    m_pVertScrollBar->SetRange(szRange.x, szRange.y);
+    m_pVertScrollBar->SetPageSize(rtScrollBar.height * 9 / 10);
+    m_pVertScrollBar->SetStepSize(m_fItemHeight);
+
+    FX_FLOAT fPos =
+        std::min(std::max(m_pVertScrollBar->GetPos(), 0.f), szRange.y);
+    m_pVertScrollBar->SetPos(fPos);
+    m_pVertScrollBar->SetTrackPos(fPos);
+    if ((m_pProperties->m_dwStyleExes & FWL_STYLEEXT_LTB_ShowScrollBarFocus) ==
+            0 ||
+        (m_pProperties->m_dwStates & FWL_WGTSTATE_Focused)) {
+      m_pVertScrollBar->SetStates(FWL_WGTSTATE_Invisible, false);
+    }
+    m_pVertScrollBar->Update();
+  } else if (m_pVertScrollBar) {
+    m_pVertScrollBar->SetPos(0);
+    m_pVertScrollBar->SetTrackPos(0);
+    m_pVertScrollBar->SetStates(FWL_WGTSTATE_Invisible, true);
+  }
+  if (bShowHorzScr) {
+    if (!m_pHorzScrollBar)
+      InitScrollBar(false);
+
+    CFX_RectF rtScrollBar;
+    rtScrollBar.Set(m_rtClient.left, m_rtClient.bottom() - m_fScorllBarWidth,
+                    m_rtClient.width, m_fScorllBarWidth);
+    if (bShowVertScr)
+      rtScrollBar.width -= m_fScorllBarWidth;
+
+    m_pHorzScrollBar->SetWidgetRect(rtScrollBar);
+    szRange.x = 0, szRange.y = fs.x - rtScrollBar.width;
+    m_pHorzScrollBar->SetRange(szRange.x, szRange.y);
+    m_pHorzScrollBar->SetPageSize(fWidth * 9 / 10);
+    m_pHorzScrollBar->SetStepSize(fWidth / 10);
+
+    FX_FLOAT fPos =
+        std::min(std::max(m_pHorzScrollBar->GetPos(), 0.f), szRange.y);
+    m_pHorzScrollBar->SetPos(fPos);
+    m_pHorzScrollBar->SetTrackPos(fPos);
+    if ((m_pProperties->m_dwStyleExes & FWL_STYLEEXT_LTB_ShowScrollBarFocus) ==
+            0 ||
+        (m_pProperties->m_dwStates & FWL_WGTSTATE_Focused)) {
+      m_pHorzScrollBar->SetStates(FWL_WGTSTATE_Invisible, false);
+    }
+    m_pHorzScrollBar->Update();
+  } else if (m_pHorzScrollBar) {
+    m_pHorzScrollBar->SetPos(0);
+    m_pHorzScrollBar->SetTrackPos(0);
+    m_pHorzScrollBar->SetStates(FWL_WGTSTATE_Invisible, true);
+  }
+  if (bShowVertScr && bShowHorzScr) {
+    m_rtStatic.Set(m_rtClient.right() - m_fScorllBarWidth,
+                   m_rtClient.bottom() - m_fScorllBarWidth, m_fScorllBarWidth,
+                   m_fScorllBarWidth);
+  }
+  return fs;
+}
+
+void CFWL_ListBox::GetItemSize(CFX_SizeF& size,
+                               CFWL_ListItem* pItem,
+                               FX_FLOAT fWidth,
+                               FX_FLOAT fItemHeight,
+                               bool bAutoSize) {
+  if (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_LTB_MultiColumn)
+    return;
+
+  if (!bAutoSize) {
+    CFX_RectF rtItem;
+    rtItem.Set(0, size.y, fWidth, fItemHeight);
+    SetItemRect(this, pItem, rtItem);
+  }
+  size.x = fWidth;
+  size.y += fItemHeight;
+}
+
+FX_FLOAT CFWL_ListBox::GetMaxTextWidth() {
+  FX_FLOAT fRet = 0.0f;
+  int32_t iCount = CountItems(this);
+  for (int32_t i = 0; i < iCount; i++) {
+    CFWL_ListItem* pItem = GetItem(this, i);
+    if (!pItem)
+      continue;
+
+    CFX_WideString wsText;
+    GetItemText(this, pItem, wsText);
+    CFX_SizeF sz = CalcTextSize(wsText, m_pProperties->m_pThemeProvider);
+    fRet = std::max(fRet, sz.x);
+  }
+  return fRet;
+}
+
+FX_FLOAT CFWL_ListBox::GetScrollWidth() {
+  FX_FLOAT* pfWidth = static_cast<FX_FLOAT*>(
+      GetThemeCapacity(CFWL_WidgetCapacity::ScrollBarWidth));
+  if (!pfWidth)
+    return 0;
+  return *pfWidth;
+}
+
+FX_FLOAT CFWL_ListBox::CalcItemHeight() {
+  FX_FLOAT* pfFont =
+      static_cast<FX_FLOAT*>(GetThemeCapacity(CFWL_WidgetCapacity::FontSize));
+  if (!pfFont)
+    return 20;
+  return *pfFont + 2 * kItemTextMargin;
+}
+
+void CFWL_ListBox::InitScrollBar(bool bVert) {
+  if ((bVert && m_pVertScrollBar) || (!bVert && m_pHorzScrollBar))
+    return;
+
+  auto prop = pdfium::MakeUnique<CFWL_WidgetProperties>();
+  prop->m_dwStyleExes = bVert ? FWL_STYLEEXT_SCB_Vert : FWL_STYLEEXT_SCB_Horz;
+  prop->m_dwStates = FWL_WGTSTATE_Invisible;
+  prop->m_pParent = this;
+  prop->m_pThemeProvider = m_pScrollBarTP;
+  CFWL_ScrollBar* sb = new CFWL_ScrollBar(m_pOwnerApp, std::move(prop), this);
+  if (bVert)
+    m_pVertScrollBar.reset(sb);
+  else
+    m_pHorzScrollBar.reset(sb);
+}
+
+bool CFWL_ListBox::IsShowScrollBar(bool bVert) {
+  CFWL_ScrollBar* pScrollbar =
+      bVert ? m_pVertScrollBar.get() : m_pHorzScrollBar.get();
+  if (!pScrollbar || (pScrollbar->GetStates() & FWL_WGTSTATE_Invisible))
+    return false;
+  return !(m_pProperties->m_dwStyleExes &
+           FWL_STYLEEXT_LTB_ShowScrollBarFocus) ||
+         (m_pProperties->m_dwStates & FWL_WGTSTATE_Focused);
+}
+
+void CFWL_ListBox::OnProcessMessage(CFWL_Message* pMessage) {
+  if (!pMessage)
+    return;
+  if (!IsEnabled())
+    return;
+
+  CFWL_MessageType dwMsgCode = pMessage->GetClassID();
+  switch (dwMsgCode) {
+    case CFWL_MessageType::SetFocus:
+      OnFocusChanged(pMessage, true);
+      break;
+    case CFWL_MessageType::KillFocus:
+      OnFocusChanged(pMessage, false);
+      break;
+    case CFWL_MessageType::Mouse: {
+      CFWL_MsgMouse* pMsg = static_cast<CFWL_MsgMouse*>(pMessage);
+      switch (pMsg->m_dwCmd) {
+        case FWL_MouseCommand::LeftButtonDown:
+          OnLButtonDown(pMsg);
+          break;
+        case FWL_MouseCommand::LeftButtonUp:
+          OnLButtonUp(pMsg);
+          break;
+        default:
+          break;
+      }
+      break;
+    }
+    case CFWL_MessageType::MouseWheel:
+      OnMouseWheel(static_cast<CFWL_MsgMouseWheel*>(pMessage));
+      break;
+    case CFWL_MessageType::Key: {
+      CFWL_MsgKey* pMsg = static_cast<CFWL_MsgKey*>(pMessage);
+      if (pMsg->m_dwCmd == FWL_KeyCommand::KeyDown)
+        OnKeyDown(pMsg);
+      break;
+    }
+    default:
+      break;
+  }
+  CFWL_Widget::OnProcessMessage(pMessage);
+}
+
+void CFWL_ListBox::OnProcessEvent(CFWL_Event* pEvent) {
+  if (!pEvent)
+    return;
+  if (pEvent->GetClassID() != CFWL_EventType::Scroll)
+    return;
+
+  CFWL_Widget* pSrcTarget = pEvent->m_pSrcTarget;
+  if ((pSrcTarget == m_pVertScrollBar.get() && m_pVertScrollBar) ||
+      (pSrcTarget == m_pHorzScrollBar.get() && m_pHorzScrollBar)) {
+    CFWL_EvtScroll* pScrollEvent = static_cast<CFWL_EvtScroll*>(pEvent);
+    OnScroll(static_cast<CFWL_ScrollBar*>(pSrcTarget),
+             pScrollEvent->m_iScrollCode, pScrollEvent->m_fPos);
+  }
+}
+
+void CFWL_ListBox::OnDrawWidget(CFX_Graphics* pGraphics,
+                                const CFX_Matrix* pMatrix) {
+  DrawWidget(pGraphics, pMatrix);
+}
+
+void CFWL_ListBox::OnFocusChanged(CFWL_Message* pMsg, bool bSet) {
+  if (GetStylesEx() & FWL_STYLEEXT_LTB_ShowScrollBarFocus) {
+    if (m_pVertScrollBar)
+      m_pVertScrollBar->SetStates(FWL_WGTSTATE_Invisible, !bSet);
+    if (m_pHorzScrollBar)
+      m_pHorzScrollBar->SetStates(FWL_WGTSTATE_Invisible, !bSet);
+  }
+  if (bSet)
+    m_pProperties->m_dwStates |= (FWL_WGTSTATE_Focused);
+  else
+    m_pProperties->m_dwStates &= ~(FWL_WGTSTATE_Focused);
+
+  Repaint(&m_rtClient);
+}
+
+void CFWL_ListBox::OnLButtonDown(CFWL_MsgMouse* pMsg) {
+  m_bLButtonDown = true;
+  if ((m_pProperties->m_dwStates & FWL_WGTSTATE_Focused) == 0)
+    SetFocus(true);
+
+  CFWL_ListItem* pItem = GetItemAtPoint(pMsg->m_fx, pMsg->m_fy);
+  if (!pItem)
+    return;
+
+  if (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_LTB_MultiSelection) {
+    if (pMsg->m_dwFlags & FWL_KEYFLAG_Ctrl) {
+      bool bSelected = IsItemSelected(pItem);
+      SetSelectionDirect(pItem, !bSelected);
+      m_hAnchor = pItem;
+    } else if (pMsg->m_dwFlags & FWL_KEYFLAG_Shift) {
+      if (m_hAnchor)
+        SetSelection(m_hAnchor, pItem, true);
+      else
+        SetSelectionDirect(pItem, true);
+    } else {
+      SetSelection(pItem, pItem, true);
+      m_hAnchor = pItem;
+    }
+  } else {
+    SetSelection(pItem, pItem, true);
+  }
+  if (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_LTB_Check) {
+    CFWL_ListItem* hSelectedItem = GetItemAtPoint(pMsg->m_fx, pMsg->m_fy);
+    CFX_RectF rtCheck;
+    GetItemCheckRectInternal(hSelectedItem, rtCheck);
+    bool bChecked = GetItemChecked(pItem);
+    if (rtCheck.Contains(pMsg->m_fx, pMsg->m_fy)) {
+      SetItemChecked(pItem, !bChecked);
+      Update();
+    }
+  }
+  SetFocusItem(pItem);
+  ScrollToVisible(pItem);
+  SetGrab(true);
+  Repaint(&m_rtClient);
+}
+
+void CFWL_ListBox::OnLButtonUp(CFWL_MsgMouse* pMsg) {
+  if (!m_bLButtonDown)
+    return;
+
+  m_bLButtonDown = false;
+  SetGrab(false);
+}
+
+void CFWL_ListBox::OnMouseWheel(CFWL_MsgMouseWheel* pMsg) {
+  if (IsShowScrollBar(true))
+    m_pVertScrollBar->GetDelegate()->OnProcessMessage(pMsg);
+}
+
+void CFWL_ListBox::OnKeyDown(CFWL_MsgKey* pMsg) {
+  uint32_t dwKeyCode = pMsg->m_dwKeyCode;
+  switch (dwKeyCode) {
+    case FWL_VKEY_Tab:
+    case FWL_VKEY_Up:
+    case FWL_VKEY_Down:
+    case FWL_VKEY_Home:
+    case FWL_VKEY_End: {
+      CFWL_ListItem* pItem = GetFocusedItem();
+      pItem = GetListItem(pItem, dwKeyCode);
+      bool bShift = !!(pMsg->m_dwFlags & FWL_KEYFLAG_Shift);
+      bool bCtrl = !!(pMsg->m_dwFlags & FWL_KEYFLAG_Ctrl);
+      OnVK(pItem, bShift, bCtrl);
+      break;
+    }
+    default:
+      break;
+  }
+}
+
+void CFWL_ListBox::OnVK(CFWL_ListItem* pItem, bool bShift, bool bCtrl) {
+  if (!pItem)
+    return;
+
+  if (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_LTB_MultiSelection) {
+    if (bCtrl) {
+      // Do nothing.
+    } else if (bShift) {
+      if (m_hAnchor)
+        SetSelection(m_hAnchor, pItem, true);
+      else
+        SetSelectionDirect(pItem, true);
+    } else {
+      SetSelection(pItem, pItem, true);
+      m_hAnchor = pItem;
+    }
+  } else {
+    SetSelection(pItem, pItem, true);
+  }
+
+  SetFocusItem(pItem);
+  ScrollToVisible(pItem);
+
+  CFX_RectF rtInvalidate;
+  rtInvalidate.Set(0, 0, m_pProperties->m_rtWidget.width,
+                   m_pProperties->m_rtWidget.height);
+  Repaint(&rtInvalidate);
+}
+
+bool CFWL_ListBox::OnScroll(CFWL_ScrollBar* pScrollBar,
+                            FWL_SCBCODE dwCode,
+                            FX_FLOAT fPos) {
+  CFX_SizeF fs;
+  pScrollBar->GetRange(&fs.x, &fs.y);
+  FX_FLOAT iCurPos = pScrollBar->GetPos();
+  FX_FLOAT fStep = pScrollBar->GetStepSize();
+  switch (dwCode) {
+    case FWL_SCBCODE::Min: {
+      fPos = fs.x;
+      break;
+    }
+    case FWL_SCBCODE::Max: {
+      fPos = fs.y;
+      break;
+    }
+    case FWL_SCBCODE::StepBackward: {
+      fPos -= fStep;
+      if (fPos < fs.x + fStep / 2)
+        fPos = fs.x;
+      break;
+    }
+    case FWL_SCBCODE::StepForward: {
+      fPos += fStep;
+      if (fPos > fs.y - fStep / 2)
+        fPos = fs.y;
+      break;
+    }
+    case FWL_SCBCODE::PageBackward: {
+      fPos -= pScrollBar->GetPageSize();
+      if (fPos < fs.x)
+        fPos = fs.x;
+      break;
+    }
+    case FWL_SCBCODE::PageForward: {
+      fPos += pScrollBar->GetPageSize();
+      if (fPos > fs.y)
+        fPos = fs.y;
+      break;
+    }
+    case FWL_SCBCODE::Pos:
+    case FWL_SCBCODE::TrackPos:
+    case FWL_SCBCODE::None:
+      break;
+    case FWL_SCBCODE::EndScroll:
+      return false;
+  }
+  if (iCurPos != fPos) {
+    pScrollBar->SetPos(fPos);
+    pScrollBar->SetTrackPos(fPos);
+    Repaint(&m_rtClient);
+  }
+  return true;
+}
+
+void CFWL_ListBox::GetItemText(CFWL_Widget* pWidget,
                                CFWL_ListItem* pItem,
                                CFX_WideString& wsText) {
-  if (GetWidget())
-    ToListBox(GetWidget())->GetItemText(pWidget, pItem, wsText);
+  if (pItem)
+    wsText = static_cast<CFWL_ListItem*>(pItem)->m_wsText;
+}
+
+int32_t CFWL_ListBox::CountItems(const CFWL_Widget* pWidget) const {
+  return pdfium::CollectionSize<int32_t>(m_ItemArray);
+}
+
+CFWL_ListItem* CFWL_ListBox::GetItem(const CFWL_Widget* pWidget,
+                                     int32_t nIndex) const {
+  if (nIndex < 0 || nIndex >= CountItems(pWidget))
+    return nullptr;
+  return m_ItemArray[nIndex].get();
+}
+
+int32_t CFWL_ListBox::GetItemIndex(CFWL_Widget* pWidget, CFWL_ListItem* pItem) {
+  auto it = std::find_if(
+      m_ItemArray.begin(), m_ItemArray.end(),
+      [pItem](const std::unique_ptr<CFWL_ListItem>& candidate) {
+        return candidate.get() == static_cast<CFWL_ListItem*>(pItem);
+      });
+  return it != m_ItemArray.end() ? it - m_ItemArray.begin() : -1;
+}
+
+uint32_t CFWL_ListBox::GetItemStyles(CFWL_Widget* pWidget,
+                                     CFWL_ListItem* pItem) {
+  return pItem ? static_cast<CFWL_ListItem*>(pItem)->m_dwStates : 0;
+}
+
+void CFWL_ListBox::GetItemRect(CFWL_Widget* pWidget,
+                               CFWL_ListItem* pItem,
+                               CFX_RectF& rtItem) {
+  if (pItem)
+    rtItem = static_cast<CFWL_ListItem*>(pItem)->m_rtItem;
+}
+
+void* CFWL_ListBox::GetItemData(CFWL_Widget* pWidget, CFWL_ListItem* pItem) {
+  return pItem ? static_cast<CFWL_ListItem*>(pItem)->m_pData : nullptr;
+}
+
+void CFWL_ListBox::SetItemStyles(CFWL_Widget* pWidget,
+                                 CFWL_ListItem* pItem,
+                                 uint32_t dwStyle) {
+  if (pItem)
+    static_cast<CFWL_ListItem*>(pItem)->m_dwStates = dwStyle;
+}
+
+void CFWL_ListBox::SetItemRect(CFWL_Widget* pWidget,
+                               CFWL_ListItem* pItem,
+                               const CFX_RectF& rtItem) {
+  if (pItem)
+    static_cast<CFWL_ListItem*>(pItem)->m_rtItem = rtItem;
+}
+
+CFX_DIBitmap* CFWL_ListBox::GetItemIcon(CFWL_Widget* pWidget,
+                                        CFWL_ListItem* pItem) {
+  return static_cast<CFWL_ListItem*>(pItem)->m_pDIB;
+}
+
+void CFWL_ListBox::GetItemCheckRect(CFWL_Widget* pWidget,
+                                    CFWL_ListItem* pItem,
+                                    CFX_RectF& rtCheck) {
+  rtCheck = static_cast<CFWL_ListItem*>(pItem)->m_rtCheckBox;
+}
+
+void CFWL_ListBox::SetItemCheckRect(CFWL_Widget* pWidget,
+                                    CFWL_ListItem* pItem,
+                                    const CFX_RectF& rtCheck) {
+  static_cast<CFWL_ListItem*>(pItem)->m_rtCheckBox = rtCheck;
+}
+
+uint32_t CFWL_ListBox::GetItemCheckState(CFWL_Widget* pWidget,
+                                         CFWL_ListItem* pItem) {
+  return static_cast<CFWL_ListItem*>(pItem)->m_dwCheckState;
+}
+
+void CFWL_ListBox::SetItemCheckState(CFWL_Widget* pWidget,
+                                     CFWL_ListItem* pItem,
+                                     uint32_t dwCheckState) {
+  static_cast<CFWL_ListItem*>(pItem)->m_dwCheckState = dwCheckState;
 }
 
 CFWL_ListItem* CFWL_ListBox::AddString(const CFX_WideStringC& wsAdd,
                                        bool bSelect) {
-  return GetWidget() ? ToListBox(GetWidget())->AddString(wsAdd, bSelect)
-                     : nullptr;
+  auto pItem = pdfium::MakeUnique<CFWL_ListItem>();
+  pItem->m_dwStates = 0;
+  pItem->m_wsText = wsAdd;
+  pItem->m_dwStates = bSelect ? FWL_ITEMSTATE_LTB_Selected : 0;
+  m_ItemArray.push_back(std::move(pItem));
+  return m_ItemArray.back().get();
+}
+
+bool CFWL_ListBox::RemoveAt(int32_t iIndex) {
+  if (iIndex < 0 || static_cast<size_t>(iIndex) >= m_ItemArray.size())
+    return false;
+
+  m_ItemArray.erase(m_ItemArray.begin() + iIndex);
+  return true;
 }
 
 bool CFWL_ListBox::DeleteString(CFWL_ListItem* pItem) {
-  return GetWidget() && ToListBox(GetWidget())->DeleteString(pItem);
+  int32_t nIndex = GetItemIndex(this, pItem);
+  if (nIndex < 0 || static_cast<size_t>(nIndex) >= m_ItemArray.size())
+    return false;
+
+  int32_t iSel = nIndex + 1;
+  if (iSel >= CountItems(this))
+    iSel = nIndex - 1;
+  if (iSel >= 0) {
+    CFWL_ListItem* pSel = static_cast<CFWL_ListItem*>(GetItem(this, iSel));
+    pSel->m_dwStates |= FWL_ITEMSTATE_LTB_Selected;
+  }
+  m_ItemArray.erase(m_ItemArray.begin() + nIndex);
+  return true;
 }
 
 void CFWL_ListBox::DeleteAll() {
-  if (GetWidget())
-    ToListBox(GetWidget())->DeleteAll();
+  m_ItemArray.clear();
 }
 
 uint32_t CFWL_ListBox::GetItemStates(CFWL_ListItem* pItem) {
@@ -68,19 +1131,3 @@ uint32_t CFWL_ListBox::GetItemStates(CFWL_ListItem* pItem) {
   return pItem->m_dwStates | pItem->m_dwCheckState;
 }
 
-int32_t CFWL_ListBox::CountSelItems() {
-  return GetWidget() ? ToListBox(GetWidget())->CountSelItems() : 0;
-}
-
-CFWL_ListItem* CFWL_ListBox::GetSelItem(int32_t nIndexSel) {
-  return GetWidget() ? ToListBox(GetWidget())->GetSelItem(nIndexSel) : nullptr;
-}
-
-int32_t CFWL_ListBox::GetSelIndex(int32_t nIndex) {
-  return GetWidget() ? ToListBox(GetWidget())->GetSelIndex(nIndex) : 0;
-}
-
-void CFWL_ListBox::SetSelItem(CFWL_ListItem* pItem, bool bSelect) {
-  if (GetWidget())
-    ToListBox(GetWidget())->SetSelItem(pItem, bSelect);
-}