text: // Copyright 2014 PDFium Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  
  // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
  
  #include "fpdfsdk/pdfwindow/cpwl_combo_box.h"
  
  #include <algorithm>
  #include <sstream>
  
  #include "core/fxge/cfx_pathdata.h"
  #include "core/fxge/cfx_renderdevice.h"
  #include "fpdfsdk/fxedit/fxet_list.h"
  #include "fpdfsdk/pdfwindow/cpwl_edit.h"
  #include "fpdfsdk/pdfwindow/cpwl_edit_ctrl.h"
  #include "fpdfsdk/pdfwindow/cpwl_list_box.h"
  #include "fpdfsdk/pdfwindow/cpwl_utils.h"
  #include "fpdfsdk/pdfwindow/cpwl_wnd.h"
  #include "public/fpdf_fwlevent.h"
  
  namespace {
  
  constexpr float kDefaultFontSize = 12.0f;
  constexpr float kTriangleHalfLength = 3.0f;
  
  }  // namespace
  
  bool CPWL_CBListBox::OnLButtonUp(const CFX_PointF& point, uint32_t nFlag) {
    CPWL_Wnd::OnLButtonUp(point, nFlag);
  
    if (!m_bMouseDown)
      return true;
  
    ReleaseCapture();
    m_bMouseDown = false;
  
    if (!ClientHitTest(point))
      return true;
    if (CPWL_Wnd* pParent = GetParentWindow())
      pParent->NotifyLButtonUp(this, point);
  
    return !OnNotifySelectionChanged(false, nFlag);
  }
  
  bool CPWL_CBListBox::IsMovementKey(uint16_t nChar) const {
    switch (nChar) {
      case FWL_VKEY_Up:
      case FWL_VKEY_Down:
      case FWL_VKEY_Home:
      case FWL_VKEY_Left:
      case FWL_VKEY_End:
      case FWL_VKEY_Right:
        return true;
      default:
        return false;
    }
  }
  
  bool CPWL_CBListBox::OnMovementKeyDown(uint16_t nChar, uint32_t nFlag) {
    ASSERT(IsMovementKey(nChar));
  
    switch (nChar) {
      case FWL_VKEY_Up:
        m_pList->OnVK_UP(IsSHIFTpressed(nFlag), IsCTRLpressed(nFlag));
        break;
      case FWL_VKEY_Down:
        m_pList->OnVK_DOWN(IsSHIFTpressed(nFlag), IsCTRLpressed(nFlag));
        break;
      case FWL_VKEY_Home:
        m_pList->OnVK_HOME(IsSHIFTpressed(nFlag), IsCTRLpressed(nFlag));
        break;
      case FWL_VKEY_Left:
        m_pList->OnVK_LEFT(IsSHIFTpressed(nFlag), IsCTRLpressed(nFlag));
        break;
      case FWL_VKEY_End:
        m_pList->OnVK_END(IsSHIFTpressed(nFlag), IsCTRLpressed(nFlag));
        break;
      case FWL_VKEY_Right:
        m_pList->OnVK_RIGHT(IsSHIFTpressed(nFlag), IsCTRLpressed(nFlag));
        break;
    }
    return OnNotifySelectionChanged(true, nFlag);
  }
  
  bool CPWL_CBListBox::IsChar(uint16_t nChar, uint32_t nFlag) const {
    return m_pList->OnChar(nChar, IsSHIFTpressed(nFlag), IsCTRLpressed(nFlag));
  }
  
  bool CPWL_CBListBox::OnCharNotify(uint16_t nChar, uint32_t nFlag) {
    if (CPWL_ComboBox* pComboBox = (CPWL_ComboBox*)GetParentWindow())
      pComboBox->SetSelectText();
  
    return OnNotifySelectionChanged(true, nFlag);
  }
  
  void CPWL_CBButton::GetThisAppearanceStream(std::ostringstream* psAppStream) {
    CPWL_Wnd::GetThisAppearanceStream(psAppStream);
  
    CFX_FloatRect rectWnd = CPWL_Wnd::GetWindowRect();
  
    if (!IsVisible() || rectWnd.IsEmpty())
      return;
  
    CFX_PointF ptCenter = GetCenterPoint();
  
    CFX_PointF pt1(ptCenter.x - kTriangleHalfLength,
                   ptCenter.y + kTriangleHalfLength * 0.5f);
    CFX_PointF pt2(ptCenter.x + kTriangleHalfLength,
                   ptCenter.y + kTriangleHalfLength * 0.5f);
    CFX_PointF pt3(ptCenter.x, ptCenter.y - kTriangleHalfLength * 0.5f);
  
    if (IsFloatBigger(rectWnd.right - rectWnd.left, kTriangleHalfLength * 2) &&
        IsFloatBigger(rectWnd.top - rectWnd.bottom, kTriangleHalfLength)) {
      *psAppStream << "q\n"
                   << "0 g\n"
                   << pt1.x << " " << pt1.y << " m\n"
                   << pt2.x << " " << pt2.y << " l\n"
                   << pt3.x << " " << pt3.y << " l\n"
                   << pt1.x << " " << pt1.y << " l f\n"
                   << "Q\n";
    }
  }
  
  void CPWL_CBButton::DrawThisAppearance(CFX_RenderDevice* pDevice,
                                         CFX_Matrix* pUser2Device) {
    CPWL_Wnd::DrawThisAppearance(pDevice, pUser2Device);
  
    CFX_FloatRect rectWnd = CPWL_Wnd::GetWindowRect();
  
    if (!IsVisible() || rectWnd.IsEmpty())
      return;
  
    CFX_PointF ptCenter = GetCenterPoint();
  
    CFX_PointF pt1(ptCenter.x - kTriangleHalfLength,
                   ptCenter.y + kTriangleHalfLength * 0.5f);
    CFX_PointF pt2(ptCenter.x + kTriangleHalfLength,
                   ptCenter.y + kTriangleHalfLength * 0.5f);
    CFX_PointF pt3(ptCenter.x, ptCenter.y - kTriangleHalfLength * 0.5f);
  
    if (IsFloatBigger(rectWnd.right - rectWnd.left, kTriangleHalfLength * 2) &&
        IsFloatBigger(rectWnd.top - rectWnd.bottom, kTriangleHalfLength)) {
      CFX_PathData path;
      path.AppendPoint(pt1, FXPT_TYPE::MoveTo, false);
      path.AppendPoint(pt2, FXPT_TYPE::LineTo, false);
      path.AppendPoint(pt3, FXPT_TYPE::LineTo, false);
      path.AppendPoint(pt1, FXPT_TYPE::LineTo, false);
  
      pDevice->DrawPath(&path, pUser2Device, nullptr,
                        PWL_DEFAULT_BLACKCOLOR.ToFXColor(GetTransparency()), 0,
                        FXFILL_ALTERNATE);
    }
  }
  
  bool CPWL_CBButton::OnLButtonDown(const CFX_PointF& point, uint32_t nFlag) {
    CPWL_Wnd::OnLButtonDown(point, nFlag);
  
    SetCapture();
  
    if (CPWL_Wnd* pParent = GetParentWindow())
      pParent->NotifyLButtonDown(this, point);
  
    return true;
  }
  
  bool CPWL_CBButton::OnLButtonUp(const CFX_PointF& point, uint32_t nFlag) {
    CPWL_Wnd::OnLButtonUp(point, nFlag);
  
    ReleaseCapture();
  
    return true;
  }
  
  CPWL_ComboBox::CPWL_ComboBox() {}
  
  CPWL_ComboBox::~CPWL_ComboBox() {}
  
  CFX_ByteString CPWL_ComboBox::GetClassName() const {
    return "CPWL_ComboBox";
  }
  
  void CPWL_ComboBox::OnCreate(PWL_CREATEPARAM& cp) {
    cp.dwFlags &= ~PWS_HSCROLL;
    cp.dwFlags &= ~PWS_VSCROLL;
  }
  
  void CPWL_ComboBox::OnDestroy() {
    // Until cleanup takes place in the virtual destructor for CPWL_Wnd
    // subclasses, implement the virtual OnDestroy method that does the
    // cleanup first, then invokes the superclass OnDestroy ... gee,
    // like a dtor would.
    m_pList.Release();
    m_pButton.Release();
    m_pEdit.Release();
    CPWL_Wnd::OnDestroy();
  }
  
  void CPWL_ComboBox::SetFocus() {
    if (m_pEdit)
      m_pEdit->SetFocus();
  }
  
  void CPWL_ComboBox::KillFocus() {
    SetPopup(false);
    CPWL_Wnd::KillFocus();
  }
  
  CFX_WideString CPWL_ComboBox::GetSelectedText() {
    if (m_pEdit)
      return m_pEdit->GetSelectedText();
  
    return CFX_WideString();
  }
  
  CFX_WideString CPWL_ComboBox::GetText() const {
    if (m_pEdit) {
      return m_pEdit->GetText();
    }
    return CFX_WideString();
  }
  
  void CPWL_ComboBox::SetText(const CFX_WideString& text) {
    if (m_pEdit)
      m_pEdit->SetText(text);
  }
  
  void CPWL_ComboBox::AddString(const CFX_WideString& str) {
    if (m_pList)
      m_pList->AddString(str);
  }
  
  int32_t CPWL_ComboBox::GetSelect() const {
    return m_nSelectItem;
  }
  
  void CPWL_ComboBox::SetSelect(int32_t nItemIndex) {
    if (m_pList)
      m_pList->Select(nItemIndex);
  
    m_pEdit->SetText(m_pList->GetText());
    m_nSelectItem = nItemIndex;
  }
  
  void CPWL_ComboBox::SetEditSel(int32_t nStartChar, int32_t nEndChar) {
    if (m_pEdit)
      m_pEdit->SetSel(nStartChar, nEndChar);
  }
  
  void CPWL_ComboBox::GetEditSel(int32_t& nStartChar, int32_t& nEndChar) const {
    nStartChar = -1;
    nEndChar = -1;
  
    if (m_pEdit)
      m_pEdit->GetSel(nStartChar, nEndChar);
  }
  
  void CPWL_ComboBox::Clear() {
    if (m_pEdit)
      m_pEdit->Clear();
  }
  
  void CPWL_ComboBox::CreateChildWnd(const PWL_CREATEPARAM& cp) {
    CreateEdit(cp);
    CreateButton(cp);
    CreateListBox(cp);
  }
  
  void CPWL_ComboBox::CreateEdit(const PWL_CREATEPARAM& cp) {
    if (m_pEdit)
      return;
  
    m_pEdit = new CPWL_Edit();
    m_pEdit->AttachFFLData(m_pFormFiller.Get());
  
    PWL_CREATEPARAM ecp = cp;
    ecp.pParentWnd = this;
    ecp.dwFlags = PWS_VISIBLE | PWS_CHILD | PWS_BORDER | PES_CENTER |
                  PES_AUTOSCROLL | PES_UNDO;
  
    if (HasFlag(PWS_AUTOFONTSIZE))
      ecp.dwFlags |= PWS_AUTOFONTSIZE;
  
    if (!HasFlag(PCBS_ALLOWCUSTOMTEXT))
      ecp.dwFlags |= PWS_READONLY;
  
    ecp.rcRectWnd = CFX_FloatRect();
    ecp.dwBorderWidth = 0;
    ecp.nBorderStyle = BorderStyle::SOLID;
    m_pEdit->Create(ecp);
  }
  
  void CPWL_ComboBox::CreateButton(const PWL_CREATEPARAM& cp) {
    if (m_pButton)
      return;
  
    m_pButton = new CPWL_CBButton;
  
    PWL_CREATEPARAM bcp = cp;
    bcp.pParentWnd = this;
    bcp.dwFlags = PWS_VISIBLE | PWS_CHILD | PWS_BORDER | PWS_BACKGROUND;
    bcp.sBackgroundColor = CFX_Color(COLORTYPE_RGB, 220.0f / 255.0f,
                                     220.0f / 255.0f, 220.0f / 255.0f);
    bcp.sBorderColor = PWL_DEFAULT_BLACKCOLOR;
    bcp.dwBorderWidth = 2;
    bcp.nBorderStyle = BorderStyle::BEVELED;
    bcp.eCursorType = FXCT_ARROW;
    m_pButton->Create(bcp);
  }
  
  void CPWL_ComboBox::CreateListBox(const PWL_CREATEPARAM& cp) {
    if (m_pList)
      return;
  
    m_pList = new CPWL_CBListBox();
    m_pList->AttachFFLData(m_pFormFiller.Get());
  
    PWL_CREATEPARAM lcp = cp;
    lcp.pParentWnd = this;
    lcp.dwFlags =
        PWS_CHILD | PWS_BORDER | PWS_BACKGROUND | PLBS_HOVERSEL | PWS_VSCROLL;
    lcp.nBorderStyle = BorderStyle::SOLID;
    lcp.dwBorderWidth = 1;
    lcp.eCursorType = FXCT_ARROW;
    lcp.rcRectWnd = CFX_FloatRect();
  
    if (cp.dwFlags & PWS_AUTOFONTSIZE)
      lcp.fFontSize = kDefaultFontSize;
    else
      lcp.fFontSize = cp.fFontSize;
  
    if (cp.sBorderColor.nColorType == COLORTYPE_TRANSPARENT)
      lcp.sBorderColor = PWL_DEFAULT_BLACKCOLOR;
  
    if (cp.sBackgroundColor.nColorType == COLORTYPE_TRANSPARENT)
      lcp.sBackgroundColor = PWL_DEFAULT_WHITECOLOR;
  
    m_pList->Create(lcp);
  }
  
  void CPWL_ComboBox::RePosChildWnd() {
    const CFX_FloatRect rcClient = GetClientRect();
    if (m_bPopup) {
      const float fOldWindowHeight = m_rcOldWindow.Height();
      const float fOldClientHeight = fOldWindowHeight - GetBorderWidth() * 2;
  
      CFX_FloatRect rcList = CPWL_Wnd::GetWindowRect();
      CFX_FloatRect rcButton = rcClient;
      rcButton.left =
          std::max(rcButton.right - PWL_COMBOBOX_BUTTON_WIDTH, rcClient.left);
      CFX_FloatRect rcEdit = rcClient;
      rcEdit.right = std::max(rcButton.left - 1.0f, rcEdit.left);
      if (m_bBottom) {
        rcButton.bottom = rcButton.top - fOldClientHeight;
        rcEdit.bottom = rcEdit.top - fOldClientHeight;
        rcList.top -= fOldWindowHeight;
      } else {
        rcButton.top = rcButton.bottom + fOldClientHeight;
        rcEdit.top = rcEdit.bottom + fOldClientHeight;
        rcList.bottom += fOldWindowHeight;
      }
  
      if (m_pButton)
        m_pButton->Move(rcButton, true, false);
  
      if (m_pEdit)
        m_pEdit->Move(rcEdit, true, false);
  
      if (m_pList) {
        m_pList->SetVisible(true);
        m_pList->Move(rcList, true, false);
        m_pList->ScrollToListItem(m_nSelectItem);
      }
      return;
    }
  
    CFX_FloatRect rcButton = rcClient;
    rcButton.left =
        std::max(rcButton.right - PWL_COMBOBOX_BUTTON_WIDTH, rcClient.left);
  
    if (m_pButton)
      m_pButton->Move(rcButton, true, false);
  
    CFX_FloatRect rcEdit = rcClient;
    rcEdit.right = std::max(rcButton.left - 1.0f, rcEdit.left);
  
    if (m_pEdit)
      m_pEdit->Move(rcEdit, true, false);
  
    if (m_pList)
      m_pList->SetVisible(false);
  }
  
  void CPWL_ComboBox::SelectAll() {
    if (m_pEdit && HasFlag(PCBS_ALLOWCUSTOMTEXT))
      m_pEdit->SelectAll();
  }
  
  CFX_FloatRect CPWL_ComboBox::GetFocusRect() const {
    return CFX_FloatRect();
  }
  
  void CPWL_ComboBox::SetPopup(bool bPopup) {
    if (!m_pList)
      return;
    if (bPopup == m_bPopup)
      return;
    float fListHeight = m_pList->GetContentRect().Height();
    if (!IsFloatBigger(fListHeight, 0.0f))
      return;
  
    if (!bPopup) {
      m_bPopup = bPopup;
      Move(m_rcOldWindow, true, true);
      return;
    }
  
    if (!m_pFillerNotify)
      return;
  
  #ifdef PDF_ENABLE_XFA
    if (m_pFillerNotify->OnPopupPreOpen(GetAttachedData(), 0))
      return;
  #endif  // PDF_ENABLE_XFA
  
    float fBorderWidth = m_pList->GetBorderWidth() * 2;
    float fPopupMin = 0.0f;
    if (m_pList->GetCount() > 3)
      fPopupMin = m_pList->GetFirstHeight() * 3 + fBorderWidth;
    float fPopupMax = fListHeight + fBorderWidth;
  
    bool bBottom;
    float fPopupRet;
    m_pFillerNotify->QueryWherePopup(GetAttachedData(), fPopupMin, fPopupMax,
                                     &bBottom, &fPopupRet);
    if (!IsFloatBigger(fPopupRet, 0.0f))
      return;
  
    m_rcOldWindow = CPWL_Wnd::GetWindowRect();
    m_bPopup = bPopup;
    m_bBottom = bBottom;
  
    CFX_FloatRect rcWindow = m_rcOldWindow;
    if (bBottom)
      rcWindow.bottom -= fPopupRet;
    else
      rcWindow.top += fPopupRet;
  
    Move(rcWindow, true, true);
  #ifdef PDF_ENABLE_XFA
    m_pFillerNotify->OnPopupPostOpen(GetAttachedData(), 0);
  #endif  // PDF_ENABLE_XFA
  }
  
  bool CPWL_ComboBox::OnKeyDown(uint16_t nChar, uint32_t nFlag) {
    if (!m_pList)
      return false;
    if (!m_pEdit)
      return false;
  
    m_nSelectItem = -1;
  
    switch (nChar) {
      case FWL_VKEY_Up:
        if (m_pList->GetCurSel() > 0) {
  #ifdef PDF_ENABLE_XFA
          if (m_pFillerNotify) {
            if (m_pFillerNotify->OnPopupPreOpen(GetAttachedData(), nFlag))
              return false;
            if (m_pFillerNotify->OnPopupPostOpen(GetAttachedData(), nFlag))
              return false;
          }
  #endif  // PDF_ENABLE_XFA
          if (m_pList->IsMovementKey(nChar)) {
            if (m_pList->OnMovementKeyDown(nChar, nFlag))
              return false;
            SetSelectText();
          }
        }
        return true;
      case FWL_VKEY_Down:
        if (m_pList->GetCurSel() < m_pList->GetCount() - 1) {
  #ifdef PDF_ENABLE_XFA
          if (m_pFillerNotify) {
            if (m_pFillerNotify->OnPopupPreOpen(GetAttachedData(), nFlag))
              return false;
            if (m_pFillerNotify->OnPopupPostOpen(GetAttachedData(), nFlag))
              return false;
          }
  #endif  // PDF_ENABLE_XFA
          if (m_pList->IsMovementKey(nChar)) {
            if (m_pList->OnMovementKeyDown(nChar, nFlag))
              return false;
            SetSelectText();
          }
        }
        return true;
    }
  
    if (HasFlag(PCBS_ALLOWCUSTOMTEXT))
      return m_pEdit->OnKeyDown(nChar, nFlag);
  
    return false;
  }
  
  bool CPWL_ComboBox::OnChar(uint16_t nChar, uint32_t nFlag) {
    if (!m_pList)
      return false;
  
    if (!m_pEdit)
      return false;
  
    m_nSelectItem = -1;
    if (HasFlag(PCBS_ALLOWCUSTOMTEXT))
      return m_pEdit->OnChar(nChar, nFlag);
  
  #ifdef PDF_ENABLE_XFA
    if (m_pFillerNotify) {
      if (m_pFillerNotify->OnPopupPreOpen(GetAttachedData(), nFlag))
        return false;
      if (m_pFillerNotify->OnPopupPostOpen(GetAttachedData(), nFlag))
        return false;
    }
  #endif  // PDF_ENABLE_XFA
    if (!m_pList->IsChar(nChar, nFlag))
      return false;
    return m_pList->OnCharNotify(nChar, nFlag);
  }
  
  void CPWL_ComboBox::NotifyLButtonDown(CPWL_Wnd* child, const CFX_PointF& pos) {
    if (child == m_pButton)
      SetPopup(!m_bPopup);
  }
  
  void CPWL_ComboBox::NotifyLButtonUp(CPWL_Wnd* child, const CFX_PointF& pos) {
    if (!m_pEdit || !m_pList || child != m_pList)
      return;
  
    SetSelectText();
    SelectAll();
    m_pEdit->SetFocus();
    SetPopup(false);
  }
  
  bool CPWL_ComboBox::IsPopup() const {
    return m_bPopup;
  }
  
  void CPWL_ComboBox::SetSelectText() {
    m_pEdit->SelectAll();
    m_pEdit->ReplaceSel(m_pList->GetText());
    m_pEdit->SelectAll();
    m_nSelectItem = m_pList->GetCurSel();
  }
  
  void CPWL_ComboBox::SetFillerNotify(IPWL_Filler_Notify* pNotify) {
    m_pFillerNotify = pNotify;
  
    if (m_pEdit)
      m_pEdit->SetFillerNotify(pNotify);
  
    if (m_pList)
      m_pList->SetFillerNotify(pNotify);
  }
  