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
25namespace {
26
27const int kItemTextMargin = 2;
28
29}  // namespace
30
31CFWL_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
46CFWL_ListBox::~CFWL_ListBox() {}
47
48FWL_Type CFWL_ListBox::GetClassID() const {
49  return FWL_Type::ListBox;
50}
51
52void 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
78FWL_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
94void 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
122void CFWL_ListBox::SetThemeProvider(IFWL_ThemeProvider* pThemeProvider) {
123  if (pThemeProvider)
124    m_pProperties->m_pThemeProvider = pThemeProvider;
125}
126
127int32_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
140CFWL_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
147int32_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
163void 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
179CFWL_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
209void 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
232void 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
242bool CFWL_ListBox::IsMultiSelection() const {
243  return m_pProperties->m_dwStyleExes & FWL_STYLEEXT_LTB_MultiSelection;
244}
245
246bool CFWL_ListBox::IsItemSelected(CFWL_ListItem* pItem) {
247  return pItem && (pItem->GetStates() & FWL_ITEMSTATE_LTB_Selected) != 0;
248}
249
250void 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
265void 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
278CFWL_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
290void 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
307CFWL_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
331bool 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
355void 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
378void 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
411void 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
471CFX_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
585void 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
598FX_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
613FX_FLOAT CFWL_ListBox::GetScrollWidth() {
614  IFWL_ThemeProvider* theme = GetAvailableTheme();
615  return theme ? theme->GetScrollBarWidth() : 0.0f;
616}
617
618FX_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
625void 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
638void 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
651bool 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
661void 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
703void 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
718void CFWL_ListBox::OnDrawWidget(CFX_Graphics* pGraphics,
719                                const CFX_Matrix* pMatrix) {
720  DrawWidget(pGraphics, pMatrix);
721}
722
723void 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
746void 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
779void CFWL_ListBox::OnLButtonUp(CFWL_MessageMouse* pMsg) {
780  if (!m_bLButtonDown)
781    return;
782
783  m_bLButtonDown = false;
784  SetGrab(false);
785}
786
787void CFWL_ListBox::OnMouseWheel(CFWL_MessageMouseWheel* pMsg) {
788  if (IsShowScrollBar(true))
789    m_pVertScrollBar->GetDelegate()->OnProcessMessage(pMsg);
790}
791
792void 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
812void 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
839bool 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
894int32_t CFWL_ListBox::CountItems(const CFWL_Widget* pWidget) const {
895  return pdfium::CollectionSize<int32_t>(m_ItemArray);
896}
897
898CFWL_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
905int32_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
914CFWL_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
920void 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
926void 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
942void CFWL_ListBox::DeleteAll() {
943  m_ItemArray.clear();
944}
945