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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/app_list/page_switcher.h"
#include <algorithm>
#include "third_party/skia/include/core/SkPath.h"
#include "ui/app_list/pagination_model.h"
#include "ui/base/animation/throb_animation.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/skia_util.h"
#include "ui/views/controls/button/custom_button.h"
#include "ui/views/layout/box_layout.h"
namespace {
const int kPreferredHeight = 57;
const int kButtonSpacing = 18;
const int kMaxButtonWidth = 68;
const int kMinButtonWidth = 44;
const int kButtonHeight = 6;
const int kButtonCornerRadius = 2;
const SkColor kHoverColor = SkColorSetRGB(0xB4, 0xB4, 0xB4);
const SkColor kNormalColor = SkColorSetRGB(0xE2, 0xE2, 0xE2);
const SkColor kSelectedColor = SkColorSetRGB(0x46, 0x8F, 0xFC);
class PageSwitcherButton : public views::CustomButton {
public:
explicit PageSwitcherButton(views::ButtonListener* listener)
: views::CustomButton(listener),
button_width_(kMaxButtonWidth),
selected_range_(0) {
}
virtual ~PageSwitcherButton() {}
void SetSelectedRange(double selected_range) {
if (selected_range_ == selected_range)
return;
selected_range_ = selected_range;
SchedulePaint();
}
void set_button_width(int button_width) { button_width_ = button_width; }
// Overridden from views::View:
virtual gfx::Size GetPreferredSize() OVERRIDE {
return gfx::Size(button_width_, kButtonHeight);
}
virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE {
if (state() == BS_HOT) {
PaintButton(canvas, kHoverColor);
} else {
PaintButton(canvas, kNormalColor);
}
}
private:
// Paints a button that has two rounded corner at bottom.
void PaintButton(gfx::Canvas* canvas, SkColor base_color) {
gfx::Rect rect(GetContentsBounds().Center(
gfx::Size(button_width_, kButtonHeight)));
SkPath path;
path.addRoundRect(gfx::RectToSkRect(rect),
SkIntToScalar(kButtonCornerRadius),
SkIntToScalar(kButtonCornerRadius));
SkPaint paint;
paint.setAntiAlias(true);
paint.setStyle(SkPaint::kFill_Style);
paint.setColor(base_color);
canvas->DrawPath(path, paint);
int selected_start_x = 0;
int selected_width = 0;
if (selected_range_ > 0) {
selected_width = selected_range_ * rect.width();
} else if (selected_range_ < 0) {
selected_width = -selected_range_ * rect.width();
selected_start_x = rect.right() - selected_width;
}
if (selected_width) {
gfx::Rect selected_rect(rect);
selected_rect.set_x(selected_start_x);
selected_rect.set_width(selected_width);
SkPath selected_path;
selected_path.addRoundRect(gfx::RectToSkRect(selected_rect),
SkIntToScalar(kButtonCornerRadius),
SkIntToScalar(kButtonCornerRadius));
paint.setColor(kSelectedColor);
canvas->DrawPath(selected_path, paint);
}
}
int button_width_;
// [-1, 1] range that represents the portion of the button that should be
// painted with kSelectedColor. Positive range starts from left side and
// negative range starts from the right side.
double selected_range_;
DISALLOW_COPY_AND_ASSIGN(PageSwitcherButton);
};
// Gets PageSwitcherButton at |index| in |buttons|.
PageSwitcherButton* GetButtonByIndex(views::View* buttons, int index) {
return static_cast<PageSwitcherButton*>(buttons->child_at(index));
}
} // namespace
namespace app_list {
PageSwitcher::PageSwitcher(PaginationModel* model)
: model_(model),
buttons_(new views::View) {
buttons_->SetLayoutManager(new views::BoxLayout(
views::BoxLayout::kHorizontal, 0, 0, kButtonSpacing));
AddChildView(buttons_);
TotalPagesChanged();
SelectedPageChanged(-1, model->selected_page());
model_->AddObserver(this);
}
PageSwitcher::~PageSwitcher() {
model_->RemoveObserver(this);
}
gfx::Size PageSwitcher::GetPreferredSize() {
// Always return a size with correct height so that container resize is not
// needed when more pages are added.
return gfx::Size(buttons_->GetPreferredSize().width(),
kPreferredHeight);
}
void PageSwitcher::Layout() {
gfx::Rect rect(GetContentsBounds());
CalculateButtonWidth(rect.width());
// Makes |buttons_| horizontally center and vertically fill.
gfx::Size buttons_size(buttons_->GetPreferredSize());
gfx::Rect buttons_bounds(rect.CenterPoint().x() - buttons_size.width() / 2,
rect.y(),
buttons_size.width(),
rect.height());
buttons_->SetBoundsRect(rect.Intersect(buttons_bounds));
}
void PageSwitcher::CalculateButtonWidth(int contents_width) {
int button_count = buttons_->child_count();
if (!button_count)
return;
int button_width = contents_width / button_count - kButtonSpacing;
button_width = std::min(kMaxButtonWidth,
std::max(kMinButtonWidth, button_width));
for (int i = 0; i < button_count; ++i) {
PageSwitcherButton* button =
static_cast<PageSwitcherButton*>(buttons_->child_at(i));
button->set_button_width(button_width);
}
}
void PageSwitcher::ButtonPressed(views::Button* sender,
const views::Event& event) {
for (int i = 0; i < buttons_->child_count(); ++i) {
if (sender == static_cast<views::Button*>(buttons_->child_at(i))) {
model_->SelectPage(i, true /* animate */);
break;
}
}
}
void PageSwitcher::TotalPagesChanged() {
buttons_->RemoveAllChildViews(true);
for (int i = 0; i < model_->total_pages(); ++i) {
PageSwitcherButton* button = new PageSwitcherButton(this);
button->SetSelectedRange(i == model_->selected_page() ? 1 : 0);
buttons_->AddChildView(button);
}
buttons_->SetVisible(model_->total_pages() > 1);
Layout();
}
void PageSwitcher::SelectedPageChanged(int old_selected, int new_selected) {
if (old_selected >= 0 && old_selected < buttons_->child_count())
GetButtonByIndex(buttons_, old_selected)->SetSelectedRange(0);
if (new_selected >= 0 && new_selected < buttons_->child_count())
GetButtonByIndex(buttons_, new_selected)->SetSelectedRange(1);
}
void PageSwitcher::TransitionChanged() {
const int current_page = model_->selected_page();
const int target_page = model_->transition().target_page;
double progress = model_->transition().progress;
double remaining = progress - 1;
if (current_page > target_page) {
remaining = -remaining;
progress = -progress;
}
GetButtonByIndex(buttons_, current_page)->SetSelectedRange(remaining);
if (model_->is_valid_page(target_page))
GetButtonByIndex(buttons_, target_page)->SetSelectedRange(progress);
}
} // namespace app_list
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