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 "xfa/fwl/cfwl_caret.h"
  
  #include <utility>
  
  #include "third_party/base/ptr_util.h"
  #include "xfa/fwl/cfwl_notedriver.h"
  #include "xfa/fwl/cfwl_themebackground.h"
  #include "xfa/fwl/cfwl_timerinfo.h"
  #include "xfa/fwl/cfwl_widgetproperties.h"
  #include "xfa/fwl/ifwl_themeprovider.h"
  
  namespace {
  
  const uint32_t kBlinkPeriodMs = 600;
  
  constexpr int kStateHighlight = (1 << 0);
  
  }  // namespace
  
  CFWL_Caret::CFWL_Caret(const CFWL_App* app,
                         std::unique_ptr<CFWL_WidgetProperties> properties,
                         CFWL_Widget* pOuter)
      : CFWL_Widget(app, std::move(properties), pOuter),
        m_pTimer(pdfium::MakeUnique<CFWL_Caret::Timer>(this)),
        m_pTimerInfo(nullptr) {
    SetStates(kStateHighlight);
  }
  
  CFWL_Caret::~CFWL_Caret() {
    if (m_pTimerInfo) {
      m_pTimerInfo->StopTimer();
      m_pTimerInfo = nullptr;
    }
  }
  
  FWL_Type CFWL_Caret::GetClassID() const {
    return FWL_Type::Caret;
  }
  
  void CFWL_Caret::Update() {}
  
  void CFWL_Caret::DrawWidget(CXFA_Graphics* pGraphics,
                              const CFX_Matrix& matrix) {
    if (!pGraphics)
      return;
    if (!m_pProperties->m_pThemeProvider)
      m_pProperties->m_pThemeProvider = GetAvailableTheme();
    if (!m_pProperties->m_pThemeProvider)
      return;
  
    DrawCaretBK(pGraphics, m_pProperties->m_pThemeProvider.Get(), &matrix);
  }
  
  void CFWL_Caret::ShowCaret() {
    if (m_pTimerInfo) {
      CFWL_TimerInfo* pOldTimerInfo = m_pTimerInfo.Release();
      pOldTimerInfo->StopTimer();
    }
  
    m_pTimerInfo = m_pTimer->StartTimer(kBlinkPeriodMs, true);
    RemoveStates(FWL_WGTSTATE_Invisible);
    SetStates(kStateHighlight);
  }
  
  void CFWL_Caret::HideCaret() {
    if (m_pTimerInfo) {
      CFWL_TimerInfo* pOldTimerInfo = m_pTimerInfo.Release();
      pOldTimerInfo->StopTimer();
    }
  
    SetStates(FWL_WGTSTATE_Invisible);
  }
  
  void CFWL_Caret::DrawCaretBK(CXFA_Graphics* pGraphics,
                               IFWL_ThemeProvider* pTheme,
                               const CFX_Matrix* pMatrix) {
    if (!(m_pProperties->m_dwStates & kStateHighlight))
      return;
  
    CFWL_ThemeBackground param;
    param.m_pWidget = this;
    param.m_pGraphics = pGraphics;
    param.m_rtPart = CFX_RectF(0, 0, GetWidgetRect().Size());
    param.m_iPart = CFWL_Part::Background;
    param.m_dwStates = CFWL_PartState_HightLight;
    if (pMatrix)
      param.m_matrix.Concat(*pMatrix);
    pTheme->DrawBackground(param);
  }
  
  void CFWL_Caret::OnProcessMessage(CFWL_Message* pMessage) {}
  
  void CFWL_Caret::OnDrawWidget(CXFA_Graphics* pGraphics,
                                const CFX_Matrix& matrix) {
    DrawWidget(pGraphics, matrix);
  }
  
  CFWL_Caret::Timer::Timer(CFWL_Caret* pCaret) : CFWL_Timer(pCaret) {}
  
  void CFWL_Caret::Timer::Run(CFWL_TimerInfo* pTimerInfo) {
    CFWL_Caret* pCaret = static_cast<CFWL_Caret*>(m_pWidget.Get());
    if (!(pCaret->GetStates() & kStateHighlight))
      pCaret->SetStates(kStateHighlight);
    else
      pCaret->RemoveStates(kStateHighlight);
  
    CFX_RectF rt = pCaret->GetWidgetRect();
    pCaret->RepaintRect(CFX_RectF(0, 0, rt.width + 1, rt.height));
  }
  