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      1 // Copyright 2014 PDFium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
      6 
      7 #include "xfa/fwl/cfwl_listbox.h"
      8 
      9 #include <algorithm>
     10 #include <memory>
     11 #include <utility>
     12 
     13 #include "third_party/base/ptr_util.h"
     14 #include "third_party/base/stl_util.h"
     15 #include "xfa/fde/tto/fde_textout.h"
     16 #include "xfa/fwl/cfwl_app.h"
     17 #include "xfa/fwl/cfwl_messagekey.h"
     18 #include "xfa/fwl/cfwl_messagemouse.h"
     19 #include "xfa/fwl/cfwl_messagemousewheel.h"
     20 #include "xfa/fwl/cfwl_themebackground.h"
     21 #include "xfa/fwl/cfwl_themepart.h"
     22 #include "xfa/fwl/cfwl_themetext.h"
     23 #include "xfa/fwl/ifwl_themeprovider.h"
     24 
     25 namespace {
     26 
     27 const int kItemTextMargin = 2;
     28 
     29 }  // namespace
     30 
     31 CFWL_ListBox::CFWL_ListBox(const CFWL_App* app,
     32                            std::unique_ptr<CFWL_WidgetProperties> properties,
     33                            CFWL_Widget* pOuter)
     34     : CFWL_Widget(app, std::move(properties), pOuter),
     35       m_dwTTOStyles(0),
     36       m_iTTOAligns(0),
     37       m_hAnchor(nullptr),
     38       m_fScorllBarWidth(0),
     39       m_bLButtonDown(false),
     40       m_pScrollBarTP(nullptr) {
     41   m_rtClient.Reset();
     42   m_rtConent.Reset();
     43   m_rtStatic.Reset();
     44 }
     45 
     46 CFWL_ListBox::~CFWL_ListBox() {}
     47 
     48 FWL_Type CFWL_ListBox::GetClassID() const {
     49   return FWL_Type::ListBox;
     50 }
     51 
     52 void CFWL_ListBox::Update() {
     53   if (IsLocked())
     54     return;
     55   if (!m_pProperties->m_pThemeProvider)
     56     m_pProperties->m_pThemeProvider = GetAvailableTheme();
     57 
     58   switch (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_LTB_AlignMask) {
     59     case FWL_STYLEEXT_LTB_LeftAlign: {
     60       m_iTTOAligns = FDE_TTOALIGNMENT_CenterLeft;
     61       break;
     62     }
     63     case FWL_STYLEEXT_LTB_RightAlign: {
     64       m_iTTOAligns = FDE_TTOALIGNMENT_CenterRight;
     65       break;
     66     }
     67     case FWL_STYLEEXT_LTB_CenterAlign:
     68     default: {
     69       m_iTTOAligns = FDE_TTOALIGNMENT_Center;
     70       break;
     71     }
     72   }
     73   m_dwTTOStyles |= FDE_TTOSTYLE_SingleLine;
     74   m_fScorllBarWidth = GetScrollWidth();
     75   CalcSize(false);
     76 }
     77 
     78 FWL_WidgetHit CFWL_ListBox::HitTest(const CFX_PointF& point) {
     79   if (IsShowScrollBar(false)) {
     80     CFX_RectF rect = m_pHorzScrollBar->GetWidgetRect();
     81     if (rect.Contains(point))
     82       return FWL_WidgetHit::HScrollBar;
     83   }
     84   if (IsShowScrollBar(true)) {
     85     CFX_RectF rect = m_pVertScrollBar->GetWidgetRect();
     86     if (rect.Contains(point))
     87       return FWL_WidgetHit::VScrollBar;
     88   }
     89   if (m_rtClient.Contains(point))
     90     return FWL_WidgetHit::Client;
     91   return FWL_WidgetHit::Unknown;
     92 }
     93 
     94 void CFWL_ListBox::DrawWidget(CFX_Graphics* pGraphics,
     95                               const CFX_Matrix* pMatrix) {
     96   if (!pGraphics)
     97     return;
     98   if (!m_pProperties->m_pThemeProvider)
     99     return;
    100 
    101   IFWL_ThemeProvider* pTheme = m_pProperties->m_pThemeProvider;
    102   pGraphics->SaveGraphState();
    103   if (HasBorder())
    104     DrawBorder(pGraphics, CFWL_Part::Border, pTheme, pMatrix);
    105 
    106   CFX_RectF rtClip(m_rtConent);
    107   if (IsShowScrollBar(false))
    108     rtClip.height -= m_fScorllBarWidth;
    109   if (IsShowScrollBar(true))
    110     rtClip.width -= m_fScorllBarWidth;
    111   if (pMatrix)
    112     pMatrix->TransformRect(rtClip);
    113 
    114   pGraphics->SetClipRect(rtClip);
    115   if ((m_pProperties->m_dwStyles & FWL_WGTSTYLE_NoBackground) == 0)
    116     DrawBkground(pGraphics, pTheme, pMatrix);
    117 
    118   DrawItems(pGraphics, pTheme, pMatrix);
    119   pGraphics->RestoreGraphState();
    120 }
    121 
    122 void CFWL_ListBox::SetThemeProvider(IFWL_ThemeProvider* pThemeProvider) {
    123   if (pThemeProvider)
    124     m_pProperties->m_pThemeProvider = pThemeProvider;
    125 }
    126 
    127 int32_t CFWL_ListBox::CountSelItems() {
    128   int32_t iRet = 0;
    129   int32_t iCount = CountItems(this);
    130   for (int32_t i = 0; i < iCount; i++) {
    131     CFWL_ListItem* pItem = GetItem(this, i);
    132     if (!pItem)
    133       continue;
    134     if (pItem->GetStates() & FWL_ITEMSTATE_LTB_Selected)
    135       iRet++;
    136   }
    137   return iRet;
    138 }
    139 
    140 CFWL_ListItem* CFWL_ListBox::GetSelItem(int32_t nIndexSel) {
    141   int32_t idx = GetSelIndex(nIndexSel);
    142   if (idx < 0)
    143     return nullptr;
    144   return GetItem(this, idx);
    145 }
    146 
    147 int32_t CFWL_ListBox::GetSelIndex(int32_t nIndex) {
    148   int32_t index = 0;
    149   int32_t iCount = CountItems(this);
    150   for (int32_t i = 0; i < iCount; i++) {
    151     CFWL_ListItem* pItem = GetItem(this, i);
    152     if (!pItem)
    153       return -1;
    154     if (pItem->GetStates() & FWL_ITEMSTATE_LTB_Selected) {
    155       if (index == nIndex)
    156         return i;
    157       index++;
    158     }
    159   }
    160   return -1;
    161 }
    162 
    163 void CFWL_ListBox::SetSelItem(CFWL_ListItem* pItem, bool bSelect) {
    164   if (!pItem) {
    165     if (bSelect) {
    166       SelectAll();
    167     } else {
    168       ClearSelection();
    169       SetFocusItem(nullptr);
    170     }
    171     return;
    172   }
    173   if (IsMultiSelection())
    174     SetSelectionDirect(pItem, bSelect);
    175   else
    176     SetSelection(pItem, pItem, bSelect);
    177 }
    178 
    179 CFWL_ListItem* CFWL_ListBox::GetListItem(CFWL_ListItem* pItem,
    180                                          uint32_t dwKeyCode) {
    181   CFWL_ListItem* hRet = nullptr;
    182   switch (dwKeyCode) {
    183     case FWL_VKEY_Up:
    184     case FWL_VKEY_Down:
    185     case FWL_VKEY_Home:
    186     case FWL_VKEY_End: {
    187       const bool bUp = dwKeyCode == FWL_VKEY_Up;
    188       const bool bDown = dwKeyCode == FWL_VKEY_Down;
    189       const bool bHome = dwKeyCode == FWL_VKEY_Home;
    190       int32_t iDstItem = -1;
    191       if (bUp || bDown) {
    192         int32_t index = GetItemIndex(this, pItem);
    193         iDstItem = dwKeyCode == FWL_VKEY_Up ? index - 1 : index + 1;
    194       } else if (bHome) {
    195         iDstItem = 0;
    196       } else {
    197         int32_t iCount = CountItems(this);
    198         iDstItem = iCount - 1;
    199       }
    200       hRet = GetItem(this, iDstItem);
    201       break;
    202     }
    203     default:
    204       break;
    205   }
    206   return hRet;
    207 }
    208 
    209 void CFWL_ListBox::SetSelection(CFWL_ListItem* hStart,
    210                                 CFWL_ListItem* hEnd,
    211                                 bool bSelected) {
    212   int32_t iStart = GetItemIndex(this, hStart);
    213   int32_t iEnd = GetItemIndex(this, hEnd);
    214   if (iStart > iEnd) {
    215     int32_t iTemp = iStart;
    216     iStart = iEnd;
    217     iEnd = iTemp;
    218   }
    219   if (bSelected) {
    220     int32_t iCount = CountItems(this);
    221     for (int32_t i = 0; i < iCount; i++) {
    222       CFWL_ListItem* pItem = GetItem(this, i);
    223       SetSelectionDirect(pItem, false);
    224     }
    225   }
    226   for (; iStart <= iEnd; iStart++) {
    227     CFWL_ListItem* pItem = GetItem(this, iStart);
    228     SetSelectionDirect(pItem, bSelected);
    229   }
    230 }
    231 
    232 void CFWL_ListBox::SetSelectionDirect(CFWL_ListItem* pItem, bool bSelect) {
    233   if (!pItem)
    234     return;
    235 
    236   uint32_t dwOldStyle = pItem->GetStates();
    237   bSelect ? dwOldStyle |= FWL_ITEMSTATE_LTB_Selected
    238           : dwOldStyle &= ~FWL_ITEMSTATE_LTB_Selected;
    239   pItem->SetStates(dwOldStyle);
    240 }
    241 
    242 bool CFWL_ListBox::IsMultiSelection() const {
    243   return m_pProperties->m_dwStyleExes & FWL_STYLEEXT_LTB_MultiSelection;
    244 }
    245 
    246 bool CFWL_ListBox::IsItemSelected(CFWL_ListItem* pItem) {
    247   return pItem && (pItem->GetStates() & FWL_ITEMSTATE_LTB_Selected) != 0;
    248 }
    249 
    250 void CFWL_ListBox::ClearSelection() {
    251   bool bMulti = IsMultiSelection();
    252   int32_t iCount = CountItems(this);
    253   for (int32_t i = 0; i < iCount; i++) {
    254     CFWL_ListItem* pItem = GetItem(this, i);
    255     if (!pItem)
    256       continue;
    257     if (!(pItem->GetStates() & FWL_ITEMSTATE_LTB_Selected))
    258       continue;
    259     SetSelectionDirect(pItem, false);
    260     if (!bMulti)
    261       return;
    262   }
    263 }
    264 
    265 void CFWL_ListBox::SelectAll() {
    266   if (!IsMultiSelection())
    267     return;
    268 
    269   int32_t iCount = CountItems(this);
    270   if (iCount <= 0)
    271     return;
    272 
    273   CFWL_ListItem* pItemStart = GetItem(this, 0);
    274   CFWL_ListItem* pItemEnd = GetItem(this, iCount - 1);
    275   SetSelection(pItemStart, pItemEnd, false);
    276 }
    277 
    278 CFWL_ListItem* CFWL_ListBox::GetFocusedItem() {
    279   int32_t iCount = CountItems(this);
    280   for (int32_t i = 0; i < iCount; i++) {
    281     CFWL_ListItem* pItem = GetItem(this, i);
    282     if (!pItem)
    283       return nullptr;
    284     if (pItem->GetStates() & FWL_ITEMSTATE_LTB_Focused)
    285       return pItem;
    286   }
    287   return nullptr;
    288 }
    289 
    290 void CFWL_ListBox::SetFocusItem(CFWL_ListItem* pItem) {
    291   CFWL_ListItem* hFocus = GetFocusedItem();
    292   if (pItem == hFocus)
    293     return;
    294 
    295   if (hFocus) {
    296     uint32_t dwStyle = hFocus->GetStates();
    297     dwStyle &= ~FWL_ITEMSTATE_LTB_Focused;
    298     hFocus->SetStates(dwStyle);
    299   }
    300   if (pItem) {
    301     uint32_t dwStyle = pItem->GetStates();
    302     dwStyle |= FWL_ITEMSTATE_LTB_Focused;
    303     pItem->SetStates(dwStyle);
    304   }
    305 }
    306 
    307 CFWL_ListItem* CFWL_ListBox::GetItemAtPoint(const CFX_PointF& point) {
    308   CFX_PointF pos = point - m_rtConent.TopLeft();
    309   FX_FLOAT fPosX = 0.0f;
    310   if (m_pHorzScrollBar)
    311     fPosX = m_pHorzScrollBar->GetPos();
    312 
    313   FX_FLOAT fPosY = 0.0;
    314   if (m_pVertScrollBar)
    315     fPosY = m_pVertScrollBar->GetPos();
    316 
    317   int32_t nCount = CountItems(this);
    318   for (int32_t i = 0; i < nCount; i++) {
    319     CFWL_ListItem* pItem = GetItem(this, i);
    320     if (!pItem)
    321       continue;
    322 
    323     CFX_RectF rtItem = pItem->GetRect();
    324     rtItem.Offset(-fPosX, -fPosY);
    325     if (rtItem.Contains(pos))
    326       return pItem;
    327   }
    328   return nullptr;
    329 }
    330 
    331 bool CFWL_ListBox::ScrollToVisible(CFWL_ListItem* pItem) {
    332   if (!m_pVertScrollBar)
    333     return false;
    334 
    335   CFX_RectF rtItem = pItem ? pItem->GetRect() : CFX_RectF();
    336   bool bScroll = false;
    337   FX_FLOAT fPosY = m_pVertScrollBar->GetPos();
    338   rtItem.Offset(0, -fPosY + m_rtConent.top);
    339   if (rtItem.top < m_rtConent.top) {
    340     fPosY += rtItem.top - m_rtConent.top;
    341     bScroll = true;
    342   } else if (rtItem.bottom() > m_rtConent.bottom()) {
    343     fPosY += rtItem.bottom() - m_rtConent.bottom();
    344     bScroll = true;
    345   }
    346   if (!bScroll)
    347     return false;
    348 
    349   m_pVertScrollBar->SetPos(fPosY);
    350   m_pVertScrollBar->SetTrackPos(fPosY);
    351   RepaintRect(m_rtClient);
    352   return true;
    353 }
    354 
    355 void CFWL_ListBox::DrawBkground(CFX_Graphics* pGraphics,
    356                                 IFWL_ThemeProvider* pTheme,
    357                                 const CFX_Matrix* pMatrix) {
    358   if (!pGraphics)
    359     return;
    360   if (!pTheme)
    361     return;
    362 
    363   CFWL_ThemeBackground param;
    364   param.m_pWidget = this;
    365   param.m_iPart = CFWL_Part::Background;
    366   param.m_dwStates = 0;
    367   param.m_pGraphics = pGraphics;
    368   param.m_matrix.Concat(*pMatrix);
    369   param.m_rtPart = m_rtClient;
    370   if (IsShowScrollBar(false) && IsShowScrollBar(true))
    371     param.m_pData = &m_rtStatic;
    372   if (!IsEnabled())
    373     param.m_dwStates = CFWL_PartState_Disabled;
    374 
    375   pTheme->DrawBackground(&param);
    376 }
    377 
    378 void CFWL_ListBox::DrawItems(CFX_Graphics* pGraphics,
    379                              IFWL_ThemeProvider* pTheme,
    380                              const CFX_Matrix* pMatrix) {
    381   FX_FLOAT fPosX = 0.0f;
    382   if (m_pHorzScrollBar)
    383     fPosX = m_pHorzScrollBar->GetPos();
    384 
    385   FX_FLOAT fPosY = 0.0f;
    386   if (m_pVertScrollBar)
    387     fPosY = m_pVertScrollBar->GetPos();
    388 
    389   CFX_RectF rtView(m_rtConent);
    390   if (m_pHorzScrollBar)
    391     rtView.height -= m_fScorllBarWidth;
    392   if (m_pVertScrollBar)
    393     rtView.width -= m_fScorllBarWidth;
    394 
    395   int32_t iCount = CountItems(this);
    396   for (int32_t i = 0; i < iCount; i++) {
    397     CFWL_ListItem* pItem = GetItem(this, i);
    398     if (!pItem)
    399       continue;
    400 
    401     CFX_RectF rtItem = pItem->GetRect();
    402     rtItem.Offset(m_rtConent.left - fPosX, m_rtConent.top - fPosY);
    403     if (rtItem.bottom() < m_rtConent.top)
    404       continue;
    405     if (rtItem.top >= m_rtConent.bottom())
    406       break;
    407     DrawItem(pGraphics, pTheme, pItem, i, rtItem, pMatrix);
    408   }
    409 }
    410 
    411 void CFWL_ListBox::DrawItem(CFX_Graphics* pGraphics,
    412                             IFWL_ThemeProvider* pTheme,
    413                             CFWL_ListItem* pItem,
    414                             int32_t Index,
    415                             const CFX_RectF& rtItem,
    416                             const CFX_Matrix* pMatrix) {
    417   uint32_t dwItemStyles = pItem ? pItem->GetStates() : 0;
    418   uint32_t dwPartStates = CFWL_PartState_Normal;
    419   if (m_pProperties->m_dwStates & FWL_WGTSTATE_Disabled)
    420     dwPartStates = CFWL_PartState_Disabled;
    421   else if (dwItemStyles & FWL_ITEMSTATE_LTB_Selected)
    422     dwPartStates = CFWL_PartState_Selected;
    423 
    424   if (m_pProperties->m_dwStates & FWL_WGTSTATE_Focused &&
    425       dwItemStyles & FWL_ITEMSTATE_LTB_Focused) {
    426     dwPartStates |= CFWL_PartState_Focused;
    427   }
    428 
    429   CFWL_ThemeBackground bg_param;
    430   bg_param.m_pWidget = this;
    431   bg_param.m_iPart = CFWL_Part::ListItem;
    432   bg_param.m_dwStates = dwPartStates;
    433   bg_param.m_pGraphics = pGraphics;
    434   bg_param.m_matrix.Concat(*pMatrix);
    435   bg_param.m_rtPart = rtItem;
    436   bg_param.m_bMaximize = true;
    437   CFX_RectF rtFocus(rtItem);
    438   bg_param.m_pData = &rtFocus;
    439   if (m_pVertScrollBar && !m_pHorzScrollBar &&
    440       (dwPartStates & CFWL_PartState_Focused)) {
    441     bg_param.m_rtPart.left += 1;
    442     bg_param.m_rtPart.width -= (m_fScorllBarWidth + 1);
    443     rtFocus.Deflate(0.5, 0.5, 1 + m_fScorllBarWidth, 1);
    444   }
    445   pTheme->DrawBackground(&bg_param);
    446 
    447   if (!pItem)
    448     return;
    449 
    450   CFX_WideString wsText = pItem->GetText();
    451   if (wsText.GetLength() <= 0)
    452     return;
    453 
    454   CFX_RectF rtText(rtItem);
    455   rtText.Deflate(kItemTextMargin, kItemTextMargin);
    456 
    457   CFWL_ThemeText textParam;
    458   textParam.m_pWidget = this;
    459   textParam.m_iPart = CFWL_Part::ListItem;
    460   textParam.m_dwStates = dwPartStates;
    461   textParam.m_pGraphics = pGraphics;
    462   textParam.m_matrix.Concat(*pMatrix);
    463   textParam.m_rtPart = rtText;
    464   textParam.m_wsText = wsText;
    465   textParam.m_dwTTOStyles = m_dwTTOStyles;
    466   textParam.m_iTTOAlign = m_iTTOAligns;
    467   textParam.m_bMaximize = true;
    468   pTheme->DrawText(&textParam);
    469 }
    470 
    471 CFX_SizeF CFWL_ListBox::CalcSize(bool bAutoSize) {
    472   if (!m_pProperties->m_pThemeProvider)
    473     return CFX_SizeF();
    474 
    475   m_rtClient = GetClientRect();
    476   m_rtConent = m_rtClient;
    477   CFX_RectF rtUIMargin;
    478   if (!m_pOuter) {
    479     CFWL_ThemePart part;
    480     part.m_pWidget = this;
    481     IFWL_ThemeProvider* theme = GetAvailableTheme();
    482     CFX_RectF pUIMargin = theme ? theme->GetUIMargin(&part) : CFX_RectF();
    483     m_rtConent.Deflate(pUIMargin.left, pUIMargin.top, pUIMargin.width,
    484                        pUIMargin.height);
    485   }
    486 
    487   FX_FLOAT fWidth = GetMaxTextWidth();
    488   fWidth += 2 * kItemTextMargin;
    489   if (!bAutoSize) {
    490     FX_FLOAT fActualWidth =
    491         m_rtClient.width - rtUIMargin.left - rtUIMargin.width;
    492     fWidth = std::max(fWidth, fActualWidth);
    493   }
    494   m_fItemHeight = CalcItemHeight();
    495 
    496   int32_t iCount = CountItems(this);
    497   CFX_SizeF fs;
    498   for (int32_t i = 0; i < iCount; i++) {
    499     CFWL_ListItem* htem = GetItem(this, i);
    500     UpdateItemSize(htem, fs, fWidth, m_fItemHeight, bAutoSize);
    501   }
    502   if (bAutoSize)
    503     return fs;
    504 
    505   FX_FLOAT iHeight = m_rtClient.height;
    506   bool bShowVertScr = false;
    507   bool bShowHorzScr = false;
    508   if (!bShowVertScr && (m_pProperties->m_dwStyles & FWL_WGTSTYLE_VScroll))
    509     bShowVertScr = (fs.height > iHeight);
    510 
    511   CFX_SizeF szRange;
    512   if (bShowVertScr) {
    513     if (!m_pVertScrollBar)
    514       InitVerticalScrollBar();
    515 
    516     CFX_RectF rtScrollBar(m_rtClient.right() - m_fScorllBarWidth,
    517                           m_rtClient.top, m_fScorllBarWidth,
    518                           m_rtClient.height - 1);
    519     if (bShowHorzScr)
    520       rtScrollBar.height -= m_fScorllBarWidth;
    521 
    522     m_pVertScrollBar->SetWidgetRect(rtScrollBar);
    523     szRange.width = 0;
    524     szRange.height = std::max(fs.height - m_rtConent.height, m_fItemHeight);
    525 
    526     m_pVertScrollBar->SetRange(szRange.width, szRange.height);
    527     m_pVertScrollBar->SetPageSize(rtScrollBar.height * 9 / 10);
    528     m_pVertScrollBar->SetStepSize(m_fItemHeight);
    529 
    530     FX_FLOAT fPos =
    531         std::min(std::max(m_pVertScrollBar->GetPos(), 0.f), szRange.height);
    532     m_pVertScrollBar->SetPos(fPos);
    533     m_pVertScrollBar->SetTrackPos(fPos);
    534     if ((m_pProperties->m_dwStyleExes & FWL_STYLEEXT_LTB_ShowScrollBarFocus) ==
    535             0 ||
    536         (m_pProperties->m_dwStates & FWL_WGTSTATE_Focused)) {
    537       m_pVertScrollBar->RemoveStates(FWL_WGTSTATE_Invisible);
    538     }
    539     m_pVertScrollBar->Update();
    540   } else if (m_pVertScrollBar) {
    541     m_pVertScrollBar->SetPos(0);
    542     m_pVertScrollBar->SetTrackPos(0);
    543     m_pVertScrollBar->SetStates(FWL_WGTSTATE_Invisible);
    544   }
    545   if (bShowHorzScr) {
    546     if (!m_pHorzScrollBar)
    547       InitHorizontalScrollBar();
    548 
    549     CFX_RectF rtScrollBar(m_rtClient.left,
    550                           m_rtClient.bottom() - m_fScorllBarWidth,
    551                           m_rtClient.width, m_fScorllBarWidth);
    552     if (bShowVertScr)
    553       rtScrollBar.width -= m_fScorllBarWidth;
    554 
    555     m_pHorzScrollBar->SetWidgetRect(rtScrollBar);
    556     szRange.width = 0;
    557     szRange.height = fs.width - rtScrollBar.width;
    558     m_pHorzScrollBar->SetRange(szRange.width, szRange.height);
    559     m_pHorzScrollBar->SetPageSize(fWidth * 9 / 10);
    560     m_pHorzScrollBar->SetStepSize(fWidth / 10);
    561 
    562     FX_FLOAT fPos =
    563         std::min(std::max(m_pHorzScrollBar->GetPos(), 0.f), szRange.height);
    564     m_pHorzScrollBar->SetPos(fPos);
    565     m_pHorzScrollBar->SetTrackPos(fPos);
    566     if ((m_pProperties->m_dwStyleExes & FWL_STYLEEXT_LTB_ShowScrollBarFocus) ==
    567             0 ||
    568         (m_pProperties->m_dwStates & FWL_WGTSTATE_Focused)) {
    569       m_pHorzScrollBar->RemoveStates(FWL_WGTSTATE_Invisible);
    570     }
    571     m_pHorzScrollBar->Update();
    572   } else if (m_pHorzScrollBar) {
    573     m_pHorzScrollBar->SetPos(0);
    574     m_pHorzScrollBar->SetTrackPos(0);
    575     m_pHorzScrollBar->SetStates(FWL_WGTSTATE_Invisible);
    576   }
    577   if (bShowVertScr && bShowHorzScr) {
    578     m_rtStatic = CFX_RectF(m_rtClient.right() - m_fScorllBarWidth,
    579                            m_rtClient.bottom() - m_fScorllBarWidth,
    580                            m_fScorllBarWidth, m_fScorllBarWidth);
    581   }
    582   return fs;
    583 }
    584 
    585 void CFWL_ListBox::UpdateItemSize(CFWL_ListItem* pItem,
    586                                   CFX_SizeF& size,
    587                                   FX_FLOAT fWidth,
    588                                   FX_FLOAT fItemHeight,
    589                                   bool bAutoSize) const {
    590   if (!bAutoSize && pItem) {
    591     CFX_RectF rtItem(0, size.height, fWidth, fItemHeight);
    592     pItem->SetRect(rtItem);
    593   }
    594   size.width = fWidth;
    595   size.height += fItemHeight;
    596 }
    597 
    598 FX_FLOAT CFWL_ListBox::GetMaxTextWidth() {
    599   FX_FLOAT fRet = 0.0f;
    600   int32_t iCount = CountItems(this);
    601   for (int32_t i = 0; i < iCount; i++) {
    602     CFWL_ListItem* pItem = GetItem(this, i);
    603     if (!pItem)
    604       continue;
    605 
    606     CFX_SizeF sz =
    607         CalcTextSize(pItem->GetText(), m_pProperties->m_pThemeProvider, false);
    608     fRet = std::max(fRet, sz.width);
    609   }
    610   return fRet;
    611 }
    612 
    613 FX_FLOAT CFWL_ListBox::GetScrollWidth() {
    614   IFWL_ThemeProvider* theme = GetAvailableTheme();
    615   return theme ? theme->GetScrollBarWidth() : 0.0f;
    616 }
    617 
    618 FX_FLOAT CFWL_ListBox::CalcItemHeight() {
    619   IFWL_ThemeProvider* theme = GetAvailableTheme();
    620   CFWL_ThemePart part;
    621   part.m_pWidget = this;
    622   return (theme ? theme->GetFontSize(&part) : 20.0f) + 2 * kItemTextMargin;
    623 }
    624 
    625 void CFWL_ListBox::InitVerticalScrollBar() {
    626   if (m_pVertScrollBar)
    627     return;
    628 
    629   auto prop = pdfium::MakeUnique<CFWL_WidgetProperties>();
    630   prop->m_dwStyleExes = FWL_STYLEEXT_SCB_Vert;
    631   prop->m_dwStates = FWL_WGTSTATE_Invisible;
    632   prop->m_pParent = this;
    633   prop->m_pThemeProvider = m_pScrollBarTP;
    634   m_pVertScrollBar =
    635       pdfium::MakeUnique<CFWL_ScrollBar>(m_pOwnerApp, std::move(prop), this);
    636 }
    637 
    638 void CFWL_ListBox::InitHorizontalScrollBar() {
    639   if (m_pHorzScrollBar)
    640     return;
    641 
    642   auto prop = pdfium::MakeUnique<CFWL_WidgetProperties>();
    643   prop->m_dwStyleExes = FWL_STYLEEXT_SCB_Horz;
    644   prop->m_dwStates = FWL_WGTSTATE_Invisible;
    645   prop->m_pParent = this;
    646   prop->m_pThemeProvider = m_pScrollBarTP;
    647   m_pHorzScrollBar =
    648       pdfium::MakeUnique<CFWL_ScrollBar>(m_pOwnerApp, std::move(prop), this);
    649 }
    650 
    651 bool CFWL_ListBox::IsShowScrollBar(bool bVert) {
    652   CFWL_ScrollBar* pScrollbar =
    653       bVert ? m_pVertScrollBar.get() : m_pHorzScrollBar.get();
    654   if (!pScrollbar || (pScrollbar->GetStates() & FWL_WGTSTATE_Invisible))
    655     return false;
    656   return !(m_pProperties->m_dwStyleExes &
    657            FWL_STYLEEXT_LTB_ShowScrollBarFocus) ||
    658          (m_pProperties->m_dwStates & FWL_WGTSTATE_Focused);
    659 }
    660 
    661 void CFWL_ListBox::OnProcessMessage(CFWL_Message* pMessage) {
    662   if (!pMessage)
    663     return;
    664   if (!IsEnabled())
    665     return;
    666 
    667   switch (pMessage->GetType()) {
    668     case CFWL_Message::Type::SetFocus:
    669       OnFocusChanged(pMessage, true);
    670       break;
    671     case CFWL_Message::Type::KillFocus:
    672       OnFocusChanged(pMessage, false);
    673       break;
    674     case CFWL_Message::Type::Mouse: {
    675       CFWL_MessageMouse* pMsg = static_cast<CFWL_MessageMouse*>(pMessage);
    676       switch (pMsg->m_dwCmd) {
    677         case FWL_MouseCommand::LeftButtonDown:
    678           OnLButtonDown(pMsg);
    679           break;
    680         case FWL_MouseCommand::LeftButtonUp:
    681           OnLButtonUp(pMsg);
    682           break;
    683         default:
    684           break;
    685       }
    686       break;
    687     }
    688     case CFWL_Message::Type::MouseWheel:
    689       OnMouseWheel(static_cast<CFWL_MessageMouseWheel*>(pMessage));
    690       break;
    691     case CFWL_Message::Type::Key: {
    692       CFWL_MessageKey* pMsg = static_cast<CFWL_MessageKey*>(pMessage);
    693       if (pMsg->m_dwCmd == FWL_KeyCommand::KeyDown)
    694         OnKeyDown(pMsg);
    695       break;
    696     }
    697     default:
    698       break;
    699   }
    700   CFWL_Widget::OnProcessMessage(pMessage);
    701 }
    702 
    703 void CFWL_ListBox::OnProcessEvent(CFWL_Event* pEvent) {
    704   if (!pEvent)
    705     return;
    706   if (pEvent->GetType() != CFWL_Event::Type::Scroll)
    707     return;
    708 
    709   CFWL_Widget* pSrcTarget = pEvent->m_pSrcTarget;
    710   if ((pSrcTarget == m_pVertScrollBar.get() && m_pVertScrollBar) ||
    711       (pSrcTarget == m_pHorzScrollBar.get() && m_pHorzScrollBar)) {
    712     CFWL_EventScroll* pScrollEvent = static_cast<CFWL_EventScroll*>(pEvent);
    713     OnScroll(static_cast<CFWL_ScrollBar*>(pSrcTarget),
    714              pScrollEvent->m_iScrollCode, pScrollEvent->m_fPos);
    715   }
    716 }
    717 
    718 void CFWL_ListBox::OnDrawWidget(CFX_Graphics* pGraphics,
    719                                 const CFX_Matrix* pMatrix) {
    720   DrawWidget(pGraphics, pMatrix);
    721 }
    722 
    723 void CFWL_ListBox::OnFocusChanged(CFWL_Message* pMsg, bool bSet) {
    724   if (GetStylesEx() & FWL_STYLEEXT_LTB_ShowScrollBarFocus) {
    725     if (m_pVertScrollBar) {
    726       if (bSet)
    727         m_pVertScrollBar->RemoveStates(FWL_WGTSTATE_Invisible);
    728       else
    729         m_pVertScrollBar->SetStates(FWL_WGTSTATE_Invisible);
    730     }
    731     if (m_pHorzScrollBar) {
    732       if (bSet)
    733         m_pHorzScrollBar->RemoveStates(FWL_WGTSTATE_Invisible);
    734       else
    735         m_pHorzScrollBar->SetStates(FWL_WGTSTATE_Invisible);
    736     }
    737   }
    738   if (bSet)
    739     m_pProperties->m_dwStates |= (FWL_WGTSTATE_Focused);
    740   else
    741     m_pProperties->m_dwStates &= ~(FWL_WGTSTATE_Focused);
    742 
    743   RepaintRect(m_rtClient);
    744 }
    745 
    746 void CFWL_ListBox::OnLButtonDown(CFWL_MessageMouse* pMsg) {
    747   m_bLButtonDown = true;
    748   if ((m_pProperties->m_dwStates & FWL_WGTSTATE_Focused) == 0)
    749     SetFocus(true);
    750 
    751   CFWL_ListItem* pItem = GetItemAtPoint(pMsg->m_pos);
    752   if (!pItem)
    753     return;
    754 
    755   if (IsMultiSelection()) {
    756     if (pMsg->m_dwFlags & FWL_KEYFLAG_Ctrl) {
    757       bool bSelected = IsItemSelected(pItem);
    758       SetSelectionDirect(pItem, !bSelected);
    759       m_hAnchor = pItem;
    760     } else if (pMsg->m_dwFlags & FWL_KEYFLAG_Shift) {
    761       if (m_hAnchor)
    762         SetSelection(m_hAnchor, pItem, true);
    763       else
    764         SetSelectionDirect(pItem, true);
    765     } else {
    766       SetSelection(pItem, pItem, true);
    767       m_hAnchor = pItem;
    768     }
    769   } else {
    770     SetSelection(pItem, pItem, true);
    771   }
    772 
    773   SetFocusItem(pItem);
    774   ScrollToVisible(pItem);
    775   SetGrab(true);
    776   RepaintRect(m_rtClient);
    777 }
    778 
    779 void CFWL_ListBox::OnLButtonUp(CFWL_MessageMouse* pMsg) {
    780   if (!m_bLButtonDown)
    781     return;
    782 
    783   m_bLButtonDown = false;
    784   SetGrab(false);
    785 }
    786 
    787 void CFWL_ListBox::OnMouseWheel(CFWL_MessageMouseWheel* pMsg) {
    788   if (IsShowScrollBar(true))
    789     m_pVertScrollBar->GetDelegate()->OnProcessMessage(pMsg);
    790 }
    791 
    792 void CFWL_ListBox::OnKeyDown(CFWL_MessageKey* pMsg) {
    793   uint32_t dwKeyCode = pMsg->m_dwKeyCode;
    794   switch (dwKeyCode) {
    795     case FWL_VKEY_Tab:
    796     case FWL_VKEY_Up:
    797     case FWL_VKEY_Down:
    798     case FWL_VKEY_Home:
    799     case FWL_VKEY_End: {
    800       CFWL_ListItem* pItem = GetFocusedItem();
    801       pItem = GetListItem(pItem, dwKeyCode);
    802       bool bShift = !!(pMsg->m_dwFlags & FWL_KEYFLAG_Shift);
    803       bool bCtrl = !!(pMsg->m_dwFlags & FWL_KEYFLAG_Ctrl);
    804       OnVK(pItem, bShift, bCtrl);
    805       break;
    806     }
    807     default:
    808       break;
    809   }
    810 }
    811 
    812 void CFWL_ListBox::OnVK(CFWL_ListItem* pItem, bool bShift, bool bCtrl) {
    813   if (!pItem)
    814     return;
    815 
    816   if (IsMultiSelection()) {
    817     if (bCtrl) {
    818       // Do nothing.
    819     } else if (bShift) {
    820       if (m_hAnchor)
    821         SetSelection(m_hAnchor, pItem, true);
    822       else
    823         SetSelectionDirect(pItem, true);
    824     } else {
    825       SetSelection(pItem, pItem, true);
    826       m_hAnchor = pItem;
    827     }
    828   } else {
    829     SetSelection(pItem, pItem, true);
    830   }
    831 
    832   SetFocusItem(pItem);
    833   ScrollToVisible(pItem);
    834 
    835   RepaintRect(CFX_RectF(0, 0, m_pProperties->m_rtWidget.width,
    836                         m_pProperties->m_rtWidget.height));
    837 }
    838 
    839 bool CFWL_ListBox::OnScroll(CFWL_ScrollBar* pScrollBar,
    840                             CFWL_EventScroll::Code dwCode,
    841                             FX_FLOAT fPos) {
    842   CFX_SizeF fs;
    843   pScrollBar->GetRange(&fs.width, &fs.height);
    844   FX_FLOAT iCurPos = pScrollBar->GetPos();
    845   FX_FLOAT fStep = pScrollBar->GetStepSize();
    846   switch (dwCode) {
    847     case CFWL_EventScroll::Code::Min: {
    848       fPos = fs.width;
    849       break;
    850     }
    851     case CFWL_EventScroll::Code::Max: {
    852       fPos = fs.height;
    853       break;
    854     }
    855     case CFWL_EventScroll::Code::StepBackward: {
    856       fPos -= fStep;
    857       if (fPos < fs.width + fStep / 2)
    858         fPos = fs.width;
    859       break;
    860     }
    861     case CFWL_EventScroll::Code::StepForward: {
    862       fPos += fStep;
    863       if (fPos > fs.height - fStep / 2)
    864         fPos = fs.height;
    865       break;
    866     }
    867     case CFWL_EventScroll::Code::PageBackward: {
    868       fPos -= pScrollBar->GetPageSize();
    869       if (fPos < fs.width)
    870         fPos = fs.width;
    871       break;
    872     }
    873     case CFWL_EventScroll::Code::PageForward: {
    874       fPos += pScrollBar->GetPageSize();
    875       if (fPos > fs.height)
    876         fPos = fs.height;
    877       break;
    878     }
    879     case CFWL_EventScroll::Code::Pos:
    880     case CFWL_EventScroll::Code::TrackPos:
    881     case CFWL_EventScroll::Code::None:
    882       break;
    883     case CFWL_EventScroll::Code::EndScroll:
    884       return false;
    885   }
    886   if (iCurPos != fPos) {
    887     pScrollBar->SetPos(fPos);
    888     pScrollBar->SetTrackPos(fPos);
    889     RepaintRect(m_rtClient);
    890   }
    891   return true;
    892 }
    893 
    894 int32_t CFWL_ListBox::CountItems(const CFWL_Widget* pWidget) const {
    895   return pdfium::CollectionSize<int32_t>(m_ItemArray);
    896 }
    897 
    898 CFWL_ListItem* CFWL_ListBox::GetItem(const CFWL_Widget* pWidget,
    899                                      int32_t nIndex) const {
    900   if (nIndex < 0 || nIndex >= CountItems(pWidget))
    901     return nullptr;
    902   return m_ItemArray[nIndex].get();
    903 }
    904 
    905 int32_t CFWL_ListBox::GetItemIndex(CFWL_Widget* pWidget, CFWL_ListItem* pItem) {
    906   auto it =
    907       std::find_if(m_ItemArray.begin(), m_ItemArray.end(),
    908                    [pItem](const std::unique_ptr<CFWL_ListItem>& candidate) {
    909                      return candidate.get() == pItem;
    910                    });
    911   return it != m_ItemArray.end() ? it - m_ItemArray.begin() : -1;
    912 }
    913 
    914 CFWL_ListItem* CFWL_ListBox::AddString(const CFX_WideStringC& wsAdd) {
    915   m_ItemArray.emplace_back(
    916       pdfium::MakeUnique<CFWL_ListItem>(CFX_WideString(wsAdd)));
    917   return m_ItemArray.back().get();
    918 }
    919 
    920 void CFWL_ListBox::RemoveAt(int32_t iIndex) {
    921   if (iIndex < 0 || static_cast<size_t>(iIndex) >= m_ItemArray.size())
    922     return;
    923   m_ItemArray.erase(m_ItemArray.begin() + iIndex);
    924 }
    925 
    926 void CFWL_ListBox::DeleteString(CFWL_ListItem* pItem) {
    927   int32_t nIndex = GetItemIndex(this, pItem);
    928   if (nIndex < 0 || static_cast<size_t>(nIndex) >= m_ItemArray.size())
    929     return;
    930 
    931   int32_t iSel = nIndex + 1;
    932   if (iSel >= CountItems(this))
    933     iSel = nIndex - 1;
    934   if (iSel >= 0) {
    935     if (CFWL_ListItem* item = GetItem(this, iSel))
    936       item->SetStates(item->GetStates() | FWL_ITEMSTATE_LTB_Selected);
    937   }
    938 
    939   m_ItemArray.erase(m_ItemArray.begin() + nIndex);
    940 }
    941 
    942 void CFWL_ListBox::DeleteAll() {
    943   m_ItemArray.clear();
    944 }
    945