PWL_Caret.cpp revision 5ae9d0c6fd838a2967cca72aa5751b51dadc2769 
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
17PWL_CARET_INFO::PWL_CARET_INFO() : bVisible(false) {}
18
19CPWL_Caret::CPWL_Caret() : m_bFlash(false), m_fWidth(0.4f), m_nDelay(0) {}
20
21CPWL_Caret::~CPWL_Caret() {}
22
23CFX_ByteString CPWL_Caret::GetClassName() const {
24  return "CPWL_Caret";
25}
26
27void CPWL_Caret::GetThisAppearanceStream(CFX_ByteTextBuf& sAppStream) {
28  GetCaretApp(sAppStream, CFX_PointF());
29}
30
31void 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
61void 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
86CFX_ByteString CPWL_Caret::GetCaretAppearanceStream(
87    const CFX_PointF& ptOffset) {
88  CFX_ByteTextBuf sCaret;
89  GetCaretApp(sCaret, ptOffset);
90  return sCaret.MakeString();
91}
92
93void CPWL_Caret::TimerProc() {
94  if (m_nDelay > 0) {
95    m_nDelay--;
96  } else {
97    m_bFlash = !m_bFlash;
98    InvalidateRect();
99  }
100}
101
102CFX_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
107void 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
138void 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