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 "ui/views/view_model_utils.h"
6
7 #include <algorithm>
8
9 #include "ui/views/view.h"
10 #include "ui/views/view_model.h"
11
12 namespace views {
13
14 namespace {
15
16 // Used in calculating ideal bounds.
primary_axis_coordinate(ViewModelUtils::Alignment alignment,int x,int y)17 int primary_axis_coordinate(ViewModelUtils::Alignment alignment,
18 int x,
19 int y) {
20 return alignment == ViewModelUtils::HORIZONTAL ? x : y;
21 }
22
23 } // namespace
24
25 // static
SetViewBoundsToIdealBounds(const ViewModel & model)26 void ViewModelUtils::SetViewBoundsToIdealBounds(const ViewModel& model) {
27 for (int i = 0; i < model.view_size(); ++i)
28 model.view_at(i)->SetBoundsRect(model.ideal_bounds(i));
29 }
30
31 // static
IsAtIdealBounds(const ViewModel & model)32 bool ViewModelUtils::IsAtIdealBounds(const ViewModel& model) {
33 for (int i = 0; i < model.view_size(); ++i) {
34 View* view = model.view_at(i);
35 if (view->bounds() != model.ideal_bounds(i))
36 return false;
37 }
38 return true;
39 }
40
41 // static
DetermineMoveIndex(const ViewModel & model,View * view,Alignment alignment,int x,int y)42 int ViewModelUtils::DetermineMoveIndex(const ViewModel& model,
43 View* view,
44 Alignment alignment,
45 int x,
46 int y) {
47 int value = primary_axis_coordinate(alignment, x, y);
48 int current_index = model.GetIndexOfView(view);
49 DCHECK_NE(-1, current_index);
50 for (int i = 0; i < current_index; ++i) {
51 int mid_point = primary_axis_coordinate(
52 alignment,
53 model.ideal_bounds(i).x() + model.ideal_bounds(i).width() / 2,
54 model.ideal_bounds(i).y() + model.ideal_bounds(i).height() / 2);
55 if (value < mid_point)
56 return i;
57 }
58
59 if (current_index + 1 == model.view_size())
60 return current_index;
61
62 // For indices after the current index ignore the bounds of the view being
63 // dragged. This keeps the view from bouncing around as moved.
64 int delta = primary_axis_coordinate(
65 alignment,
66 model.ideal_bounds(current_index + 1).x() -
67 model.ideal_bounds(current_index).x(),
68 model.ideal_bounds(current_index + 1).y() -
69 model.ideal_bounds(current_index).y());
70 for (int i = current_index + 1; i < model.view_size(); ++i) {
71 const gfx::Rect& bounds(model.ideal_bounds(i));
72 int mid_point = primary_axis_coordinate(
73 alignment,
74 bounds.x() + bounds.width() / 2 - delta,
75 bounds.y() + bounds.height() / 2 - delta);
76 if (value < mid_point)
77 return i - 1;
78 }
79 return model.view_size() - 1;
80 }
81
82 } // namespace views
83