cxfa_layoutprocessor.cpp revision 5ae9d0c6fd838a2967cca72aa5751b51dadc2769 
1// Copyright 2016 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 "xfa/fxfa/parser/cxfa_layoutprocessor.h"
8
9#include "third_party/base/ptr_util.h"
10#include "xfa/fxfa/parser/cxfa_contentlayoutitem.h"
11#include "xfa/fxfa/parser/cxfa_document.h"
12#include "xfa/fxfa/parser/cxfa_layoutpagemgr.h"
13#include "xfa/fxfa/parser/cxfa_measurement.h"
14#include "xfa/fxfa/parser/xfa_document_datamerger_imp.h"
15#include "xfa/fxfa/parser/xfa_layout_itemlayout.h"
16#include "xfa/fxfa/parser/xfa_localemgr.h"
17#include "xfa/fxfa/parser/xfa_object.h"
18#include "xfa/fxfa/parser/xfa_utils.h"
19
20CXFA_LayoutProcessor::CXFA_LayoutProcessor(CXFA_Document* pDocument)
21    : m_pDocument(pDocument),
22      m_nProgressCounter(0),
23      m_bNeeLayout(true) {}
24
25CXFA_LayoutProcessor::~CXFA_LayoutProcessor() {}
26
27CXFA_Document* CXFA_LayoutProcessor::GetDocument() const {
28  return m_pDocument;
29}
30
31int32_t CXFA_LayoutProcessor::StartLayout(bool bForceRestart) {
32  if (!bForceRestart && !IsNeedLayout())
33    return 100;
34
35  m_pRootItemLayoutProcessor.reset();
36  m_nProgressCounter = 0;
37  CXFA_Node* pFormPacketNode =
38      ToNode(m_pDocument->GetXFAObject(XFA_HASHCODE_Form));
39  if (!pFormPacketNode)
40    return -1;
41
42  CXFA_Node* pFormRoot =
43      pFormPacketNode->GetFirstChildByClass(XFA_Element::Subform);
44  if (!pFormRoot)
45    return -1;
46
47  if (!m_pLayoutPageMgr)
48    m_pLayoutPageMgr = pdfium::MakeUnique<CXFA_LayoutPageMgr>(this);
49  if (!m_pLayoutPageMgr->InitLayoutPage(pFormRoot))
50    return -1;
51
52  if (!m_pLayoutPageMgr->PrepareFirstPage(pFormRoot))
53    return -1;
54
55  m_pRootItemLayoutProcessor = pdfium::MakeUnique<CXFA_ItemLayoutProcessor>(
56      pFormRoot, m_pLayoutPageMgr.get());
57  m_nProgressCounter = 1;
58  return 0;
59}
60
61int32_t CXFA_LayoutProcessor::DoLayout(IFX_Pause* pPause) {
62  if (m_nProgressCounter < 1)
63    return -1;
64
65  XFA_ItemLayoutProcessorResult eStatus;
66  CXFA_Node* pFormNode = m_pRootItemLayoutProcessor->GetFormNode();
67  FX_FLOAT fPosX = pFormNode->GetMeasure(XFA_ATTRIBUTE_X).ToUnit(XFA_UNIT_Pt);
68  FX_FLOAT fPosY = pFormNode->GetMeasure(XFA_ATTRIBUTE_Y).ToUnit(XFA_UNIT_Pt);
69  do {
70    FX_FLOAT fAvailHeight = m_pLayoutPageMgr->GetAvailHeight();
71    eStatus = m_pRootItemLayoutProcessor->DoLayout(true, fAvailHeight,
72                                                   fAvailHeight, nullptr);
73    if (eStatus != XFA_ItemLayoutProcessorResult::Done)
74      m_nProgressCounter++;
75
76    CXFA_ContentLayoutItem* pLayoutItem =
77        m_pRootItemLayoutProcessor->ExtractLayoutItem();
78    if (pLayoutItem)
79      pLayoutItem->m_sPos = CFX_PointF(fPosX, fPosY);
80
81    m_pLayoutPageMgr->SubmitContentItem(pLayoutItem, eStatus);
82  } while (eStatus != XFA_ItemLayoutProcessorResult::Done &&
83           (!pPause || !pPause->NeedToPauseNow()));
84
85  if (eStatus == XFA_ItemLayoutProcessorResult::Done) {
86    m_pLayoutPageMgr->FinishPaginatedPageSets();
87    m_pLayoutPageMgr->SyncLayoutData();
88    m_bNeeLayout = false;
89    m_rgChangedContainers.RemoveAll();
90  }
91  return 100 * (eStatus == XFA_ItemLayoutProcessorResult::Done
92                    ? m_nProgressCounter
93                    : m_nProgressCounter - 1) /
94         m_nProgressCounter;
95}
96
97bool CXFA_LayoutProcessor::IncrementLayout() {
98  if (m_bNeeLayout) {
99    StartLayout(true);
100    return DoLayout(nullptr) == 100;
101  }
102
103  for (int32_t i = 0, c = m_rgChangedContainers.GetSize(); i < c; i++) {
104    CXFA_Node* pNode = m_rgChangedContainers[i];
105    CXFA_Node* pParentNode =
106        pNode->GetNodeItem(XFA_NODEITEM_Parent, XFA_ObjectType::ContainerNode);
107    if (!pParentNode)
108      return false;
109    if (!CXFA_ItemLayoutProcessor::IncrementRelayoutNode(this, pNode,
110                                                         pParentNode)) {
111      return false;
112    }
113  }
114  m_rgChangedContainers.RemoveAll();
115  return true;
116}
117
118int32_t CXFA_LayoutProcessor::CountPages() const {
119  return m_pLayoutPageMgr ? m_pLayoutPageMgr->GetPageCount() : 0;
120}
121
122CXFA_ContainerLayoutItem* CXFA_LayoutProcessor::GetPage(int32_t index) const {
123  return m_pLayoutPageMgr ? m_pLayoutPageMgr->GetPage(index) : nullptr;
124}
125
126CXFA_LayoutItem* CXFA_LayoutProcessor::GetLayoutItem(CXFA_Node* pFormItem) {
127  return static_cast<CXFA_LayoutItem*>(
128      pFormItem->GetUserData(XFA_LAYOUTITEMKEY));
129}
130
131void CXFA_LayoutProcessor::AddChangedContainer(CXFA_Node* pContainer) {
132  if (m_rgChangedContainers.Find(pContainer) < 0)
133    m_rgChangedContainers.Add(pContainer);
134}
135
136CXFA_ContainerLayoutItem* CXFA_LayoutProcessor::GetRootLayoutItem() const {
137  return m_pLayoutPageMgr ? m_pLayoutPageMgr->GetRootLayoutItem() : nullptr;
138}
139
140bool CXFA_LayoutProcessor::IsNeedLayout() {
141  return m_bNeeLayout || m_rgChangedContainers.GetSize() > 0;
142}
143