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// Copyright 2016 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 "chrome/browser/ui/autofill/popup_view_common.h"
#include <algorithm>
#include <utility>
#include "ui/display/display.h"
#include "ui/display/screen.h"
#include "ui/gfx/geometry/point.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/geometry/vector2d.h"
namespace autofill {
namespace {
std::pair<int, int> CalculatePopupXAndWidth(
const display::Display& left_display,
const display::Display& right_display,
int popup_required_width,
const gfx::Rect& element_bounds,
bool is_rtl) {
int leftmost_display_x = left_display.bounds().x();
int rightmost_display_x =
right_display.GetSizeInPixel().width() + right_display.bounds().x();
// Calculate the start coordinates for the popup if it is growing right or
// the end position if it is growing to the left, capped to screen space.
int right_growth_start = std::max(
leftmost_display_x, std::min(rightmost_display_x, element_bounds.x()));
int left_growth_end =
std::max(leftmost_display_x,
std::min(rightmost_display_x, element_bounds.right()));
int right_available = rightmost_display_x - right_growth_start;
int left_available = left_growth_end - leftmost_display_x;
int popup_width =
std::min(popup_required_width, std::max(right_available, left_available));
std::pair<int, int> grow_right(right_growth_start, popup_width);
std::pair<int, int> grow_left(left_growth_end - popup_width, popup_width);
// Prefer to grow towards the end (right for LTR, left for RTL). But if there
// is not enough space available in the desired direction and more space in
// the other direction, reverse it.
if (is_rtl) {
return left_available >= popup_width || left_available >= right_available
? grow_left
: grow_right;
}
return right_available >= popup_width || right_available >= left_available
? grow_right
: grow_left;
}
// Calculates the height of the popup and the y position of it. These values
// will stay on the screen.
std::pair<int, int> CalculatePopupYAndHeight(
const display::Display& top_display,
const display::Display& bottom_display,
int popup_required_height,
const gfx::Rect& element_bounds) {
int topmost_display_y = top_display.bounds().y();
int bottommost_display_y =
bottom_display.GetSizeInPixel().height() + bottom_display.bounds().y();
// Calculate the start coordinates for the popup if it is growing down or
// the end position if it is growing up, capped to screen space.
int top_growth_end = std::max(
topmost_display_y, std::min(bottommost_display_y, element_bounds.y()));
int bottom_growth_start =
std::max(topmost_display_y,
std::min(bottommost_display_y, element_bounds.bottom()));
int top_available = bottom_growth_start - topmost_display_y;
int bottom_available = bottommost_display_y - top_growth_end;
// TODO(csharp): Restrict the popup height to what is available.
if (bottom_available >= popup_required_height ||
bottom_available >= top_available) {
// The popup can appear below the field.
return std::make_pair(bottom_growth_start, popup_required_height);
} else {
// The popup must appear above the field.
return std::make_pair(top_growth_end - popup_required_height,
popup_required_height);
}
}
} // namespace
gfx::Rect PopupViewCommon::CalculatePopupBounds(int desired_width,
int desired_height,
const gfx::Rect& element_bounds,
gfx::NativeView container_view,
bool is_rtl) {
// This is the top left point of the popup if the popup is above the element
// and grows to the left (since that is the highest and furthest left the
// popup go could).
gfx::Point top_left_corner_of_popup =
element_bounds.origin() +
gfx::Vector2d(element_bounds.width() - desired_width, -desired_height);
// This is the bottom right point of the popup if the popup is below the
// element and grows to the right (since the is the lowest and furthest right
// the popup could go).
gfx::Point bottom_right_corner_of_popup =
element_bounds.origin() +
gfx::Vector2d(desired_width, element_bounds.height() + desired_height);
display::Display top_left_display =
GetDisplayNearestPoint(top_left_corner_of_popup, container_view);
display::Display bottom_right_display =
GetDisplayNearestPoint(bottom_right_corner_of_popup, container_view);
std::pair<int, int> popup_x_and_width =
CalculatePopupXAndWidth(top_left_display, bottom_right_display,
desired_width, element_bounds, is_rtl);
std::pair<int, int> popup_y_and_height = CalculatePopupYAndHeight(
top_left_display, bottom_right_display, desired_height, element_bounds);
return gfx::Rect(popup_x_and_width.first, popup_y_and_height.first,
popup_x_and_width.second, popup_y_and_height.second);
}
display::Display PopupViewCommon::GetDisplayNearestPoint(
const gfx::Point& point,
gfx::NativeView container_view) {
return display::Screen::GetScreen()->GetDisplayNearestPoint(point);
}
} // namespace autofill
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