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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 "fpdfsdk/pdfwindow/PWL_Caret.h"
      8 
      9 #include "core/fxge/cfx_graphstatedata.h"
     10 #include "core/fxge/cfx_pathdata.h"
     11 #include "core/fxge/cfx_renderdevice.h"
     12 #include "fpdfsdk/pdfwindow/PWL_Utils.h"
     13 #include "fpdfsdk/pdfwindow/PWL_Wnd.h"
     14 
     15 #define PWL_CARET_FLASHINTERVAL 500
     16 
     17 PWL_CARET_INFO::PWL_CARET_INFO() : bVisible(false) {}
     18 
     19 CPWL_Caret::CPWL_Caret() : m_bFlash(false), m_fWidth(0.4f), m_nDelay(0) {}
     20 
     21 CPWL_Caret::~CPWL_Caret() {}
     22 
     23 CFX_ByteString CPWL_Caret::GetClassName() const {
     24   return "CPWL_Caret";
     25 }
     26 
     27 void CPWL_Caret::GetThisAppearanceStream(CFX_ByteTextBuf& sAppStream) {
     28   GetCaretApp(sAppStream, CFX_PointF());
     29 }
     30 
     31 void CPWL_Caret::DrawThisAppearance(CFX_RenderDevice* pDevice,
     32                                     CFX_Matrix* pUser2Device) {
     33   if (IsVisible() && m_bFlash) {
     34     CFX_FloatRect rcRect = GetCaretRect();
     35     CFX_FloatRect rcClip = GetClipRect();
     36     CFX_PathData path;
     37 
     38     FX_FLOAT fCaretX = rcRect.left + m_fWidth * 0.5f;
     39     FX_FLOAT fCaretTop = rcRect.top;
     40     FX_FLOAT fCaretBottom = rcRect.bottom;
     41     if (!rcClip.IsEmpty()) {
     42       rcRect.Intersect(rcClip);
     43       if (rcRect.IsEmpty())
     44         return;
     45 
     46       fCaretTop = rcRect.top;
     47       fCaretBottom = rcRect.bottom;
     48     }
     49 
     50     path.AppendPoint(CFX_PointF(fCaretX, fCaretBottom), FXPT_TYPE::MoveTo,
     51                      false);
     52     path.AppendPoint(CFX_PointF(fCaretX, fCaretTop), FXPT_TYPE::LineTo, false);
     53 
     54     CFX_GraphStateData gsd;
     55     gsd.m_LineWidth = m_fWidth;
     56     pDevice->DrawPath(&path, pUser2Device, &gsd, 0, ArgbEncode(255, 0, 0, 0),
     57                       FXFILL_ALTERNATE);
     58   }
     59 }
     60 
     61 void CPWL_Caret::GetCaretApp(CFX_ByteTextBuf& sAppStream,
     62                              const CFX_PointF& ptOffset) {
     63   if (IsVisible() && m_bFlash) {
     64     CFX_ByteTextBuf sCaret;
     65 
     66     CFX_FloatRect rcRect = GetCaretRect();
     67     CFX_FloatRect rcClip = GetClipRect();
     68 
     69     rcRect = CPWL_Utils::OffsetRect(rcRect, ptOffset.x, ptOffset.y);
     70     rcClip = CPWL_Utils::OffsetRect(rcClip, ptOffset.x, ptOffset.y);
     71 
     72     sCaret << "q\n";
     73     if (!rcClip.IsEmpty()) {
     74       sCaret << rcClip.left << " " << rcClip.bottom + 2.5f << " "
     75              << rcClip.right - rcClip.left << " "
     76              << rcClip.top - rcClip.bottom - 4.5f << " re W n\n";
     77     }
     78     sCaret << m_fWidth << " w\n0 G\n";
     79     sCaret << rcRect.left + m_fWidth / 2 << " " << rcRect.bottom << " m\n";
     80     sCaret << rcRect.left + m_fWidth / 2 << " " << rcRect.top << " l S\nQ\n";
     81 
     82     sAppStream << sCaret;
     83   }
     84 }
     85 
     86 CFX_ByteString CPWL_Caret::GetCaretAppearanceStream(
     87     const CFX_PointF& ptOffset) {
     88   CFX_ByteTextBuf sCaret;
     89   GetCaretApp(sCaret, ptOffset);
     90   return sCaret.MakeString();
     91 }
     92 
     93 void CPWL_Caret::TimerProc() {
     94   if (m_nDelay > 0) {
     95     m_nDelay--;
     96   } else {
     97     m_bFlash = !m_bFlash;
     98     InvalidateRect();
     99   }
    100 }
    101 
    102 CFX_FloatRect CPWL_Caret::GetCaretRect() const {
    103   return CFX_FloatRect(m_ptFoot.x, m_ptFoot.y, m_ptHead.x + m_fWidth,
    104                        m_ptHead.y);
    105 }
    106 
    107 void CPWL_Caret::SetCaret(bool bVisible,
    108                           const CFX_PointF& ptHead,
    109                           const CFX_PointF& ptFoot) {
    110   if (bVisible) {
    111     if (IsVisible()) {
    112       if (m_ptHead != ptHead || m_ptFoot != ptFoot) {
    113         m_ptHead = ptHead;
    114         m_ptFoot = ptFoot;
    115         m_bFlash = true;
    116         Move(m_rcInvalid, false, true);
    117       }
    118     } else {
    119       m_ptHead = ptHead;
    120       m_ptFoot = ptFoot;
    121       EndTimer();
    122       BeginTimer(PWL_CARET_FLASHINTERVAL);
    123       CPWL_Wnd::SetVisible(true);
    124       m_bFlash = true;
    125       Move(m_rcInvalid, false, true);
    126     }
    127   } else {
    128     m_ptHead = CFX_PointF();
    129     m_ptFoot = CFX_PointF();
    130     m_bFlash = false;
    131     if (IsVisible()) {
    132       EndTimer();
    133       CPWL_Wnd::SetVisible(false);
    134     }
    135   }
    136 }
    137 
    138 void CPWL_Caret::InvalidateRect(CFX_FloatRect* pRect) {
    139   if (pRect) {
    140     CFX_FloatRect rcRefresh = CPWL_Utils::InflateRect(*pRect, 0.5f);
    141     rcRefresh.top += 1;
    142     rcRefresh.bottom -= 1;
    143     CPWL_Wnd::InvalidateRect(&rcRefresh);
    144   } else {
    145     CPWL_Wnd::InvalidateRect(pRect);
    146   }
    147 }
    148