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/include/pdfwindow/PWL_Caret.h"
8#include "fpdfsdk/include/pdfwindow/PWL_Utils.h"
9#include "fpdfsdk/include/pdfwindow/PWL_Wnd.h"
10
11#define PWL_CARET_FLASHINTERVAL 500
12
13CPWL_Caret::CPWL_Caret()
14    : m_bFlash(FALSE),
15      m_ptHead(0, 0),
16      m_ptFoot(0, 0),
17      m_fWidth(0.4f),
18      m_nDelay(0) {}
19
20CPWL_Caret::~CPWL_Caret() {}
21
22CFX_ByteString CPWL_Caret::GetClassName() const {
23  return "CPWL_Caret";
24}
25
26void CPWL_Caret::GetThisAppearanceStream(CFX_ByteTextBuf& sAppStream) {
27  GetCaretApp(sAppStream, CPDF_Point(0.0f, 0.0f));
28}
29
30void CPWL_Caret::DrawThisAppearance(CFX_RenderDevice* pDevice,
31                                    CFX_Matrix* pUser2Device) {
32  if (IsVisible() && m_bFlash) {
33    CPDF_Rect rcRect = GetCaretRect();
34    CPDF_Rect rcClip = GetClipRect();
35
36    CFX_PathData path;
37
38    path.SetPointCount(2);
39
40    FX_FLOAT fCaretX = rcRect.left + m_fWidth * 0.5f;
41    FX_FLOAT fCaretTop = rcRect.top;
42    FX_FLOAT fCaretBottom = rcRect.bottom;
43
44    if (!rcClip.IsEmpty()) {
45      rcRect.Intersect(rcClip);
46      if (!rcRect.IsEmpty()) {
47        fCaretTop = rcRect.top;
48        fCaretBottom = rcRect.bottom;
49        path.SetPoint(0, fCaretX, fCaretBottom, FXPT_MOVETO);
50        path.SetPoint(1, fCaretX, fCaretTop, FXPT_LINETO);
51      } else {
52        return;
53      }
54    } else {
55      path.SetPoint(0, fCaretX, fCaretBottom, FXPT_MOVETO);
56      path.SetPoint(1, fCaretX, fCaretTop, FXPT_LINETO);
57    }
58
59    CFX_GraphStateData gsd;
60    gsd.m_LineWidth = m_fWidth;
61
62    pDevice->DrawPath(&path, pUser2Device, &gsd, 0, ArgbEncode(255, 0, 0, 0),
63                      FXFILL_ALTERNATE);
64  }
65}
66
67void CPWL_Caret::GetCaretApp(CFX_ByteTextBuf& sAppStream,
68                             const CPDF_Point& ptOffset) {
69  if (IsVisible() && m_bFlash) {
70    CFX_ByteTextBuf sCaret;
71
72    CPDF_Rect rcRect = GetCaretRect();
73    CPDF_Rect rcClip = GetClipRect();
74
75    rcRect = CPWL_Utils::OffsetRect(rcRect, ptOffset.x, ptOffset.y);
76    rcClip = CPWL_Utils::OffsetRect(rcClip, ptOffset.x, ptOffset.y);
77
78    sCaret << "q\n";
79    if (!rcClip.IsEmpty()) {
80      sCaret << rcClip.left << " " << rcClip.bottom + 2.5f << " "
81             << rcClip.right - rcClip.left << " "
82             << rcClip.top - rcClip.bottom - 4.5f << " re W n\n";
83    }
84    sCaret << m_fWidth << " w\n0 G\n";
85    sCaret << rcRect.left + m_fWidth / 2 << " " << rcRect.bottom << " m\n";
86    sCaret << rcRect.left + m_fWidth / 2 << " " << rcRect.top << " l S\nQ\n";
87
88    sAppStream << sCaret;
89  }
90}
91
92CFX_ByteString CPWL_Caret::GetCaretAppearanceStream(
93    const CPDF_Point& ptOffset) {
94  CFX_ByteTextBuf sCaret;
95  GetCaretApp(sCaret, ptOffset);
96  return sCaret.GetByteString();
97}
98
99void CPWL_Caret::TimerProc() {
100  if (m_nDelay > 0) {
101    m_nDelay--;
102  } else {
103    m_bFlash = !m_bFlash;
104    InvalidateRect();
105  }
106}
107
108CPDF_Rect CPWL_Caret::GetCaretRect() const {
109  return CPDF_Rect(m_ptFoot.x, m_ptFoot.y, m_ptHead.x + m_fWidth, m_ptHead.y);
110}
111
112void CPWL_Caret::SetCaret(FX_BOOL bVisible,
113                          const CPDF_Point& ptHead,
114                          const CPDF_Point& ptFoot) {
115  if (bVisible) {
116    if (IsVisible()) {
117      if (m_ptHead.x != ptHead.x || m_ptHead.y != ptHead.y ||
118          m_ptFoot.x != ptFoot.x || m_ptFoot.y != ptFoot.y) {
119        m_ptHead = ptHead;
120        m_ptFoot = ptFoot;
121
122        m_bFlash = TRUE;
123        Move(m_rcInvalid, FALSE, TRUE);
124      }
125    } else {
126      m_ptHead = ptHead;
127      m_ptFoot = ptFoot;
128
129      EndTimer();
130      BeginTimer(PWL_CARET_FLASHINTERVAL);
131
132      CPWL_Wnd::SetVisible(TRUE);
133      m_bFlash = TRUE;
134
135      Move(m_rcInvalid, FALSE, TRUE);
136    }
137  } else {
138    m_ptHead = CPDF_Point(0, 0);
139    m_ptFoot = CPDF_Point(0, 0);
140
141    m_bFlash = FALSE;
142    if (IsVisible()) {
143      EndTimer();
144      CPWL_Wnd::SetVisible(FALSE);
145    }
146  }
147}
148
149void CPWL_Caret::InvalidateRect(CPDF_Rect* pRect) {
150  if (pRect) {
151    CPDF_Rect rcRefresh = CPWL_Utils::InflateRect(*pRect, 0.5f);
152    rcRefresh.top += 1;
153    rcRefresh.bottom -= 1;
154
155    CPWL_Wnd::InvalidateRect(&rcRefresh);
156  } else {
157    CPWL_Wnd::InvalidateRect(pRect);
158  }
159}
160