1 // Copyright (c) 2012 The Chromium 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 #include "chrome/browser/ui/views/location_bar/location_bar_layout.h"
6
7 #include "chrome/browser/ui/views/location_bar/location_bar_view.h"
8 #include "ui/gfx/rect.h"
9 #include "ui/views/view.h"
10
11
12 // Description of a decoration to be added inside the location bar, either to
13 // the left or to the right.
14 struct LocationBarDecoration {
15 LocationBarDecoration(int y,
16 int height,
17 bool auto_collapse,
18 double max_fraction,
19 int edge_item_padding,
20 int item_padding,
21 views::View* view);
22
23 // The y position of the view inside its parent.
24 int y;
25
26 // The height of the view.
27 int height;
28
29 // True means that, if there is not enough available space in the location
30 // bar, the view will reduce its width either to its minimal width or to zero
31 // (making it invisible), whichever fits. If true, |max_fraction| must be 0.
32 bool auto_collapse;
33
34 // Used for resizeable decorations, indicates the maximum fraction of the
35 // location bar that can be taken by this decoration, 0 for non-resizable
36 // decorations. If non-zero, |auto_collapse| must be false.
37 double max_fraction;
38
39 // Padding to use if the decoration is the first element next to the edge.
40 int edge_item_padding;
41
42 // Padding to use if the decoration follows another decoration.
43 int item_padding;
44
45 views::View* view;
46
47 // The width computed by the layout process.
48 double computed_width;
49 };
50
LocationBarDecoration(int y,int height,bool auto_collapse,double max_fraction,int edge_item_padding,int item_padding,views::View * view)51 LocationBarDecoration::LocationBarDecoration(int y,
52 int height,
53 bool auto_collapse,
54 double max_fraction,
55 int edge_item_padding,
56 int item_padding,
57 views::View* view)
58 : y(y),
59 height(height),
60 auto_collapse(auto_collapse),
61 max_fraction(max_fraction),
62 edge_item_padding(edge_item_padding),
63 item_padding(item_padding),
64 view(view),
65 computed_width(0) {
66 DCHECK((max_fraction == 0.0) || (!auto_collapse && (max_fraction > 0.0)));
67 }
68
69
70 // LocationBarLayout ---------------------------------------------------------
71
LocationBarLayout(Position position,int item_edit_padding)72 LocationBarLayout::LocationBarLayout(Position position, int item_edit_padding)
73 : position_(position),
74 item_edit_padding_(item_edit_padding) {
75 }
76
77
~LocationBarLayout()78 LocationBarLayout::~LocationBarLayout() {
79 }
80
AddDecoration(int y,int height,bool auto_collapse,double max_fraction,int edge_item_padding,int item_padding,views::View * view)81 void LocationBarLayout::AddDecoration(int y,
82 int height,
83 bool auto_collapse,
84 double max_fraction,
85 int edge_item_padding,
86 int item_padding,
87 views::View* view) {
88 decorations_.push_back(new LocationBarDecoration(
89 y, height, auto_collapse, max_fraction, edge_item_padding, item_padding,
90 view));
91 }
92
AddDecoration(int y,int height,views::View * view)93 void LocationBarLayout::AddDecoration(int y,
94 int height,
95 views::View* view) {
96 decorations_.push_back(new LocationBarDecoration(
97 y, height, false, 0, LocationBarView::kItemPadding,
98 LocationBarView::kItemPadding, view));
99 }
100
LayoutPass1(int * entry_width)101 void LocationBarLayout::LayoutPass1(int* entry_width) {
102 bool first_item = true;
103 for (Decorations::iterator i(decorations_.begin()); i != decorations_.end();
104 ++i) {
105 // Autocollapsing decorations are ignored in this pass.
106 if (!(*i)->auto_collapse) {
107 *entry_width -=
108 (first_item ? (*i)->edge_item_padding : (*i)->item_padding);
109 }
110 first_item = false;
111 // Resizing decorations are ignored in this pass.
112 if (!(*i)->auto_collapse && ((*i)->max_fraction == 0.0)) {
113 (*i)->computed_width = (*i)->view->GetPreferredSize().width();
114 *entry_width -= (*i)->computed_width;
115 }
116 }
117 *entry_width -= item_edit_padding_;
118 }
119
LayoutPass2(int * entry_width)120 void LocationBarLayout::LayoutPass2(int *entry_width) {
121 for (Decorations::iterator i(decorations_.begin()); i != decorations_.end();
122 ++i) {
123 if ((*i)->max_fraction > 0.0) {
124 int max_width = static_cast<int>(*entry_width * (*i)->max_fraction);
125 (*i)->computed_width =
126 std::min((*i)->view->GetPreferredSize().width(),
127 std::max((*i)->view->GetMinimumSize().width(), max_width));
128 *entry_width -= (*i)->computed_width;
129 }
130 }
131 }
132
LayoutPass3(gfx::Rect * bounds,int * available_width)133 void LocationBarLayout::LayoutPass3(gfx::Rect* bounds, int* available_width) {
134 bool first_visible = true;
135 for (Decorations::iterator i(decorations_.begin()); i != decorations_.end();
136 ++i) {
137 // Collapse decorations if needed.
138 if ((*i)->auto_collapse) {
139 int padding =
140 (first_visible ? (*i)->edge_item_padding : (*i)->item_padding);
141 // Try preferred size, if it fails try minimum size, if it fails collapse.
142 (*i)->computed_width = (*i)->view->GetPreferredSize().width();
143 if ((*i)->computed_width + padding > *available_width)
144 (*i)->computed_width = (*i)->view->GetMinimumSize().width();
145 if ((*i)->computed_width + padding > *available_width) {
146 (*i)->computed_width = 0;
147 (*i)->view->SetVisible(false);
148 } else {
149 (*i)->view->SetVisible(true);
150 (*available_width) -= (*i)->computed_width + padding;
151 }
152 } else {
153 (*i)->view->SetVisible(true);
154 }
155
156 // Layout visible decorations.
157 if (!(*i)->view->visible())
158 continue;
159 int padding =
160 (first_visible ? (*i)->edge_item_padding : (*i)->item_padding);
161 first_visible = false;
162 int x = (position_ == LEFT_EDGE) ? (bounds->x() + padding) :
163 (bounds->right() - padding - (*i)->computed_width);
164 (*i)->view->SetBounds(x, (*i)->y, (*i)->computed_width, (*i)->height);
165 bounds->set_width(bounds->width() - padding - (*i)->computed_width);
166 if (position_ == LEFT_EDGE)
167 bounds->set_x(bounds->x() + padding + (*i)->computed_width);
168 }
169 bounds->set_width(bounds->width() - item_edit_padding_);
170 if (position_ == LEFT_EDGE)
171 bounds->set_x(bounds->x() + item_edit_padding_);
172 }
173