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_layoutitem.h"
8 
9 #include "xfa/fxfa/app/xfa_ffnotify.h"
10 #include "xfa/fxfa/parser/cxfa_containerlayoutitem.h"
11 #include "xfa/fxfa/parser/cxfa_contentlayoutitem.h"
12 #include "xfa/fxfa/parser/cxfa_measurement.h"
13 
XFA_ReleaseLayoutItem(CXFA_LayoutItem * pLayoutItem)14 void XFA_ReleaseLayoutItem(CXFA_LayoutItem* pLayoutItem) {
15   CXFA_LayoutItem* pNode = pLayoutItem->m_pFirstChild;
16   CXFA_FFNotify* pNotify = pLayoutItem->m_pFormNode->GetDocument()->GetNotify();
17   CXFA_LayoutProcessor* pDocLayout =
18       pLayoutItem->m_pFormNode->GetDocument()->GetDocLayout();
19   while (pNode) {
20     CXFA_LayoutItem* pNext = pNode->m_pNextSibling;
21     pNode->m_pParent = nullptr;
22     pNotify->OnLayoutItemRemoving(pDocLayout,
23                                   static_cast<CXFA_LayoutItem*>(pNode));
24     XFA_ReleaseLayoutItem(pNode);
25     pNode = pNext;
26   }
27 
28   pNotify->OnLayoutItemRemoving(pDocLayout, pLayoutItem);
29   if (pLayoutItem->m_pFormNode->GetElementType() == XFA_Element::PageArea) {
30     pNotify->OnPageEvent(static_cast<CXFA_ContainerLayoutItem*>(pLayoutItem),
31                          XFA_PAGEVIEWEVENT_PostRemoved);
32   }
33   delete pLayoutItem;
34 }
35 
CXFA_LayoutItem(CXFA_Node * pNode,bool bIsContentLayoutItem)36 CXFA_LayoutItem::CXFA_LayoutItem(CXFA_Node* pNode, bool bIsContentLayoutItem)
37     : m_pFormNode(pNode),
38       m_pParent(nullptr),
39       m_pNextSibling(nullptr),
40       m_pFirstChild(nullptr),
41       m_bIsContentLayoutItem(bIsContentLayoutItem) {}
42 
~CXFA_LayoutItem()43 CXFA_LayoutItem::~CXFA_LayoutItem() {}
44 
AsContainerLayoutItem()45 CXFA_ContainerLayoutItem* CXFA_LayoutItem::AsContainerLayoutItem() {
46   return IsContainerLayoutItem() ? static_cast<CXFA_ContainerLayoutItem*>(this)
47                                  : nullptr;
48 }
49 
AsContentLayoutItem()50 CXFA_ContentLayoutItem* CXFA_LayoutItem::AsContentLayoutItem() {
51   return IsContentLayoutItem() ? static_cast<CXFA_ContentLayoutItem*>(this)
52                                : nullptr;
53 }
54 
GetPage() const55 CXFA_ContainerLayoutItem* CXFA_LayoutItem::GetPage() const {
56   for (CXFA_LayoutItem* pCurNode = const_cast<CXFA_LayoutItem*>(this); pCurNode;
57        pCurNode = pCurNode->m_pParent) {
58     if (pCurNode->m_pFormNode->GetElementType() == XFA_Element::PageArea)
59       return static_cast<CXFA_ContainerLayoutItem*>(pCurNode);
60   }
61   return nullptr;
62 }
63 
GetRect(bool bRelative) const64 CFX_RectF CXFA_LayoutItem::GetRect(bool bRelative) const {
65   ASSERT(m_bIsContentLayoutItem);
66 
67   auto pThis = static_cast<const CXFA_ContentLayoutItem*>(this);
68   CFX_PointF sPos = pThis->m_sPos;
69   CFX_SizeF sSize = pThis->m_sSize;
70   if (bRelative)
71     return CFX_RectF(sPos, sSize);
72 
73   for (CXFA_LayoutItem* pLayoutItem = pThis->m_pParent; pLayoutItem;
74        pLayoutItem = pLayoutItem->m_pParent) {
75     if (CXFA_ContentLayoutItem* pContent = pLayoutItem->AsContentLayoutItem()) {
76       sPos += pContent->m_sPos;
77       CXFA_Node* pMarginNode =
78           pLayoutItem->m_pFormNode->GetFirstChildByClass(XFA_Element::Margin);
79       if (pMarginNode) {
80         sPos += CFX_PointF(pMarginNode->GetMeasure(XFA_ATTRIBUTE_LeftInset)
81                                .ToUnit(XFA_UNIT_Pt),
82                            pMarginNode->GetMeasure(XFA_ATTRIBUTE_TopInset)
83                                .ToUnit(XFA_UNIT_Pt));
84       }
85       continue;
86     }
87 
88     if (pLayoutItem->m_pFormNode->GetElementType() ==
89         XFA_Element::ContentArea) {
90       sPos += CFX_PointF(pLayoutItem->m_pFormNode->GetMeasure(XFA_ATTRIBUTE_X)
91                              .ToUnit(XFA_UNIT_Pt),
92                          pLayoutItem->m_pFormNode->GetMeasure(XFA_ATTRIBUTE_Y)
93                              .ToUnit(XFA_UNIT_Pt));
94       break;
95     }
96     if (pLayoutItem->m_pFormNode->GetElementType() == XFA_Element::PageArea)
97       break;
98   }
99   return CFX_RectF(sPos, sSize);
100 }
101 
GetFirst()102 CXFA_LayoutItem* CXFA_LayoutItem::GetFirst() {
103   ASSERT(m_bIsContentLayoutItem);
104   CXFA_ContentLayoutItem* pCurNode = static_cast<CXFA_ContentLayoutItem*>(this);
105   while (pCurNode->m_pPrev)
106     pCurNode = pCurNode->m_pPrev;
107 
108   return pCurNode;
109 }
110 
GetLast() const111 const CXFA_LayoutItem* CXFA_LayoutItem::GetLast() const {
112   ASSERT(m_bIsContentLayoutItem);
113   const CXFA_ContentLayoutItem* pCurNode =
114       static_cast<const CXFA_ContentLayoutItem*>(this);
115   while (pCurNode->m_pNext)
116     pCurNode = pCurNode->m_pNext;
117 
118   return pCurNode;
119 }
120 
GetPrev() const121 CXFA_LayoutItem* CXFA_LayoutItem::GetPrev() const {
122   ASSERT(m_bIsContentLayoutItem);
123 
124   return static_cast<const CXFA_ContentLayoutItem*>(this)->m_pPrev;
125 }
126 
GetNext() const127 CXFA_LayoutItem* CXFA_LayoutItem::GetNext() const {
128   ASSERT(m_bIsContentLayoutItem);
129   return static_cast<const CXFA_ContentLayoutItem*>(this)->m_pNext;
130 }
131 
GetIndex() const132 int32_t CXFA_LayoutItem::GetIndex() const {
133   ASSERT(m_bIsContentLayoutItem);
134   int32_t iIndex = 0;
135   const CXFA_ContentLayoutItem* pCurNode =
136       static_cast<const CXFA_ContentLayoutItem*>(this);
137   while (pCurNode->m_pPrev) {
138     pCurNode = pCurNode->m_pPrev;
139     ++iIndex;
140   }
141   return iIndex;
142 }
143 
GetCount() const144 int32_t CXFA_LayoutItem::GetCount() const {
145   ASSERT(m_bIsContentLayoutItem);
146 
147   int32_t iCount = GetIndex() + 1;
148   const CXFA_ContentLayoutItem* pCurNode =
149       static_cast<const CXFA_ContentLayoutItem*>(this);
150   while (pCurNode->m_pNext) {
151     pCurNode = pCurNode->m_pNext;
152     iCount++;
153   }
154   return iCount;
155 }
156 
AddChild(CXFA_LayoutItem * pChildItem)157 void CXFA_LayoutItem::AddChild(CXFA_LayoutItem* pChildItem) {
158   if (pChildItem->m_pParent)
159     pChildItem->m_pParent->RemoveChild(pChildItem);
160 
161   pChildItem->m_pParent = this;
162   if (!m_pFirstChild) {
163     m_pFirstChild = pChildItem;
164     return;
165   }
166 
167   CXFA_LayoutItem* pExistingChildItem = m_pFirstChild;
168   while (pExistingChildItem->m_pNextSibling)
169     pExistingChildItem = pExistingChildItem->m_pNextSibling;
170 
171   pExistingChildItem->m_pNextSibling = pChildItem;
172 }
173 
AddHeadChild(CXFA_LayoutItem * pChildItem)174 void CXFA_LayoutItem::AddHeadChild(CXFA_LayoutItem* pChildItem) {
175   if (pChildItem->m_pParent)
176     pChildItem->m_pParent->RemoveChild(pChildItem);
177 
178   pChildItem->m_pParent = this;
179   if (!m_pFirstChild) {
180     m_pFirstChild = pChildItem;
181     return;
182   }
183 
184   CXFA_LayoutItem* pExistingChildItem = m_pFirstChild;
185   m_pFirstChild = pChildItem;
186   m_pFirstChild->m_pNextSibling = pExistingChildItem;
187 }
188 
InsertChild(CXFA_LayoutItem * pBeforeItem,CXFA_LayoutItem * pChildItem)189 void CXFA_LayoutItem::InsertChild(CXFA_LayoutItem* pBeforeItem,
190                                   CXFA_LayoutItem* pChildItem) {
191   if (pBeforeItem->m_pParent != this)
192     return;
193   if (pChildItem->m_pParent)
194     pChildItem->m_pParent = nullptr;
195 
196   pChildItem->m_pParent = this;
197 
198   CXFA_LayoutItem* pExistingChildItem = pBeforeItem->m_pNextSibling;
199   pBeforeItem->m_pNextSibling = pChildItem;
200   pChildItem->m_pNextSibling = pExistingChildItem;
201 }
202 
RemoveChild(CXFA_LayoutItem * pChildItem)203 void CXFA_LayoutItem::RemoveChild(CXFA_LayoutItem* pChildItem) {
204   if (pChildItem->m_pParent != this)
205     return;
206 
207   if (m_pFirstChild == pChildItem) {
208     m_pFirstChild = pChildItem->m_pNextSibling;
209   } else {
210     CXFA_LayoutItem* pExistingChildItem = m_pFirstChild;
211     while (pExistingChildItem &&
212            pExistingChildItem->m_pNextSibling != pChildItem) {
213       pExistingChildItem = pExistingChildItem->m_pNextSibling;
214     }
215     if (pExistingChildItem)
216       pExistingChildItem->m_pNextSibling = pChildItem->m_pNextSibling;
217   }
218   pChildItem->m_pNextSibling = nullptr;
219   pChildItem->m_pParent = nullptr;
220 }
221