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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/views/layout/box_layout.h"
#include "ui/gfx/rect.h"
#include "ui/views/view.h"
namespace views {
BoxLayout::BoxLayout(BoxLayout::Orientation orientation,
int inside_border_horizontal_spacing,
int inside_border_vertical_spacing,
int between_child_spacing)
: orientation_(orientation),
inside_border_insets_(inside_border_vertical_spacing,
inside_border_horizontal_spacing,
inside_border_vertical_spacing,
inside_border_horizontal_spacing),
between_child_spacing_(between_child_spacing),
spread_blank_space_(false) {
}
BoxLayout::~BoxLayout() {
}
void BoxLayout::Layout(View* host) {
gfx::Rect child_area(host->GetLocalBounds());
child_area.Inset(host->GetInsets());
child_area.Inset(inside_border_insets_);
int x = child_area.x();
int y = child_area.y();
int padding = 0;
if (spread_blank_space_) {
int total = 0;
int visible = 0;
for (int i = 0; i < host->child_count(); ++i) {
View* child = host->child_at(i);
if (!child->visible())
continue;
if (orientation_ == kHorizontal) {
total += child->GetPreferredSize().width() + between_child_spacing_;
} else {
total += child->GetHeightForWidth(child_area.width()) +
between_child_spacing_;
}
++visible;
}
if (visible) {
total -= between_child_spacing_;
if (orientation_ == kHorizontal)
padding = (child_area.width() - total) / visible;
else
padding = (child_area.height() - total) / visible;
if (padding < 0)
padding = 0;
}
}
for (int i = 0; i < host->child_count(); ++i) {
View* child = host->child_at(i);
if (child->visible()) {
gfx::Rect bounds(x, y, child_area.width(), child_area.height());
if (orientation_ == kHorizontal) {
bounds.set_width(child->GetPreferredSize().width() + padding);
x += bounds.width() + between_child_spacing_;
} else {
bounds.set_height(child->GetHeightForWidth(bounds.width()) + padding);
y += bounds.height() + between_child_spacing_;
}
// Clamp child view bounds to |child_area|.
bounds.Intersect(child_area);
child->SetBoundsRect(bounds);
}
}
}
gfx::Size BoxLayout::GetPreferredSize(View* host) {
// Calculate the child views' preferred width.
int width = 0;
if (orientation_ == kVertical) {
for (int i = 0; i < host->child_count(); ++i) {
View* child = host->child_at(i);
if (!child->visible())
continue;
width = std::max(width, child->GetPreferredSize().width());
}
}
return GetPreferredSizeForChildWidth(host, width);
}
int BoxLayout::GetPreferredHeightForWidth(View* host, int width) {
int child_width = width - NonChildSize(host).width();
return GetPreferredSizeForChildWidth(host, child_width).height();
}
gfx::Size BoxLayout::GetPreferredSizeForChildWidth(View* host,
int child_area_width) {
gfx::Rect child_area_bounds;
if (orientation_ == kHorizontal) {
// Horizontal layouts ignore |child_area_width|, meaning they mimic the
// default behavior of GridLayout::GetPreferredHeightForWidth().
// TODO(estade): fix this if it ever becomes a problem.
int position = 0;
for (int i = 0; i < host->child_count(); ++i) {
View* child = host->child_at(i);
if (!child->visible())
continue;
gfx::Size size(child->GetPreferredSize());
gfx::Rect child_bounds(position, 0, size.width(), size.height());
child_area_bounds.Union(child_bounds);
position += size.width() + between_child_spacing_;
}
} else {
int height = 0;
for (int i = 0; i < host->child_count(); ++i) {
View* child = host->child_at(i);
if (!child->visible())
continue;
height += child->GetHeightForWidth(child_area_width);
if (i != 0)
height += between_child_spacing_;
}
child_area_bounds.set_width(child_area_width);
child_area_bounds.set_height(height);
}
gfx::Size non_child_size = NonChildSize(host);
return gfx::Size(child_area_bounds.width() + non_child_size.width(),
child_area_bounds.height() + non_child_size.height());
}
gfx::Size BoxLayout::NonChildSize(View* host) {
gfx::Insets insets(host->GetInsets());
return gfx::Size(insets.width() + inside_border_insets_.width(),
insets.height() + inside_border_insets_.height());
}
} // namespace views
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