1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
3 /* This Source Code Form is subject to the terms of the Mozilla Public
4 * License, v. 2.0. If a copy of the MPL was not distributed with this
5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
6
7 //
8 // Eric Vaughan
9 // Netscape Communications
10 //
11 // See documentation in associated header file
12 //
13
14 #include "nsGridRowLayout.h"
15 #include "nsBoxLayoutState.h"
16 #include "nsIScrollableFrame.h"
17 #include "nsStackLayout.h"
18 #include "nsGrid.h"
19
nsGridRowLayout()20 nsGridRowLayout::nsGridRowLayout() : nsSprocketLayout() {}
21
22 nsGridRowLayout::~nsGridRowLayout() = default;
23
ChildrenInserted(nsIFrame * aBox,nsBoxLayoutState & aState,nsIFrame * aPrevBox,const nsFrameList::Slice & aNewChildren)24 void nsGridRowLayout::ChildrenInserted(nsIFrame* aBox, nsBoxLayoutState& aState,
25 nsIFrame* aPrevBox,
26 const nsFrameList::Slice& aNewChildren) {
27 ChildAddedOrRemoved(aBox, aState);
28 }
29
ChildrenAppended(nsIFrame * aBox,nsBoxLayoutState & aState,const nsFrameList::Slice & aNewChildren)30 void nsGridRowLayout::ChildrenAppended(nsIFrame* aBox, nsBoxLayoutState& aState,
31 const nsFrameList::Slice& aNewChildren) {
32 ChildAddedOrRemoved(aBox, aState);
33 }
34
ChildrenRemoved(nsIFrame * aBox,nsBoxLayoutState & aState,nsIFrame * aChildList)35 void nsGridRowLayout::ChildrenRemoved(nsIFrame* aBox, nsBoxLayoutState& aState,
36 nsIFrame* aChildList) {
37 ChildAddedOrRemoved(aBox, aState);
38 }
39
ChildrenSet(nsIFrame * aBox,nsBoxLayoutState & aState,nsIFrame * aChildList)40 void nsGridRowLayout::ChildrenSet(nsIFrame* aBox, nsBoxLayoutState& aState,
41 nsIFrame* aChildList) {
42 ChildAddedOrRemoved(aBox, aState);
43 }
44
GetParentGridPart(nsIFrame * aBox,nsIFrame ** aParentBox)45 nsIGridPart* nsGridRowLayout::GetParentGridPart(nsIFrame* aBox,
46 nsIFrame** aParentBox) {
47 // go up and find our parent gridRow. Skip and non gridRow
48 // parents.
49 *aParentBox = nullptr;
50
51 // walk up through any scrollboxes
52 aBox = nsGrid::GetScrollBox(aBox);
53
54 // get the parent
55 if (aBox) {
56 aBox = nsIFrame::GetParentXULBox(aBox);
57 }
58
59 if (aBox) {
60 nsIGridPart* parentGridRow = nsGrid::GetPartFromBox(aBox);
61 if (parentGridRow && parentGridRow->CanContain(this)) {
62 *aParentBox = aBox;
63 return parentGridRow;
64 }
65 }
66
67 return nullptr;
68 }
69
GetGrid(nsIFrame * aBox,int32_t * aIndex,nsGridRowLayout * aRequestor)70 nsGrid* nsGridRowLayout::GetGrid(nsIFrame* aBox, int32_t* aIndex,
71 nsGridRowLayout* aRequestor) {
72 if (aRequestor == nullptr) {
73 nsIFrame* parentBox; // nsIFrame is implemented by nsIFrame and is not
74 // refcounted.
75 nsIGridPart* parent = GetParentGridPart(aBox, &parentBox);
76 if (parent) return parent->GetGrid(parentBox, aIndex, this);
77 return nullptr;
78 }
79
80 int32_t index = -1;
81 nsIFrame* child = nsIFrame::GetChildXULBox(aBox);
82 int32_t count = 0;
83 while (child) {
84 // if there is a scrollframe walk inside it to its child
85 nsIFrame* childBox = nsGrid::GetScrolledBox(child);
86
87 nsBoxLayout* layout = childBox->GetXULLayoutManager();
88 nsIGridPart* gridRow = nsGrid::GetPartFromBox(childBox);
89 if (gridRow) {
90 if (layout == aRequestor) {
91 index = count;
92 break;
93 }
94 count += gridRow->GetRowCount();
95 } else
96 count++;
97
98 child = nsIFrame::GetNextXULBox(child);
99 }
100
101 // if we didn't find ourselves then the tree isn't properly formed yet
102 // this could happen during initial construction so lets just
103 // fail.
104 if (index == -1) {
105 *aIndex = -1;
106 return nullptr;
107 }
108
109 (*aIndex) += index;
110
111 nsIFrame*
112 parentBox; // nsIFrame is implemented by nsIFrame and is not refcounted.
113 nsIGridPart* parent = GetParentGridPart(aBox, &parentBox);
114 if (parent) return parent->GetGrid(parentBox, aIndex, this);
115
116 return nullptr;
117 }
118
GetTotalMargin(nsIFrame * aBox,bool aIsHorizontal)119 nsMargin nsGridRowLayout::GetTotalMargin(nsIFrame* aBox, bool aIsHorizontal) {
120 // get our parents margin
121 nsMargin margin(0, 0, 0, 0);
122 nsIFrame* parent = nullptr;
123 nsIGridPart* part = GetParentGridPart(aBox, &parent);
124 if (part && parent) {
125 // if we are the first or last child walk upward and add margins.
126
127 // make sure we check for a scrollbox
128 aBox = nsGrid::GetScrollBox(aBox);
129
130 // see if we have a next to see if we are last
131 nsIFrame* next = nsIFrame::GetNextXULBox(aBox);
132
133 // get the parent first child to see if we are first
134 nsIFrame* child = nsIFrame::GetChildXULBox(parent);
135
136 margin = part->GetTotalMargin(parent, aIsHorizontal);
137
138 // if first or last
139 if (child == aBox || next == nullptr) {
140 // if it's not the first child remove the top margin
141 // we don't need it.
142 if (child != aBox) {
143 if (aIsHorizontal)
144 margin.top = 0;
145 else
146 margin.left = 0;
147 }
148
149 // if it's not the last child remove the bottom margin
150 // we don't need it.
151 if (next != nullptr) {
152 if (aIsHorizontal)
153 margin.bottom = 0;
154 else
155 margin.right = 0;
156 }
157 }
158 }
159
160 // add ours to it.
161 nsMargin ourMargin;
162 aBox->GetXULMargin(ourMargin);
163 margin += ourMargin;
164
165 return margin;
166 }
167
168 NS_IMPL_ADDREF_INHERITED(nsGridRowLayout, nsBoxLayout)
169 NS_IMPL_RELEASE_INHERITED(nsGridRowLayout, nsBoxLayout)
170
171 NS_INTERFACE_MAP_BEGIN(nsGridRowLayout)
172 NS_INTERFACE_MAP_ENTRY(nsIGridPart)
173 NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIGridPart)
174 NS_INTERFACE_MAP_END_INHERITING(nsBoxLayout)
175