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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 "ash/launcher/overflow_button.h"
#include "grit/ash_strings.h"
#include "grit/ui_resources.h"
#include "third_party/skia/include/core/SkPaint.h"
#include "third_party/skia/include/core/SkPath.h"
#include "ui/base/animation/throb_animation.h"
#include "ui/base/l10n/l10n_util.h"
#include "ui/base/resource/resource_bundle.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/skia_util.h"
#include "ui/gfx/transform.h"
namespace ash {
namespace internal {
namespace {
const int kButtonHoverAlpha = 150;
const int kButtonCornerRadius = 2;
const int kButtonHoverSize = 28;
void RotateCounterclockwise(ui::Transform* transform) {
transform->matrix().set3x3(0, -1, 0,
1, 0, 0,
0, 0, 1);
}
void RotateClockwise(ui::Transform* transform) {
transform->matrix().set3x3( 0, 1, 0,
-1, 0, 0,
0, 0, 1);
}
} // namesapce
OverflowButton::OverflowButton(views::ButtonListener* listener)
: CustomButton(listener),
alignment_(SHELF_ALIGNMENT_BOTTOM),
image_(NULL) {
ResourceBundle& rb = ResourceBundle::GetSharedInstance();
image_ = rb.GetImageNamed(IDR_AURA_LAUNCHER_OVERFLOW).ToImageSkia();
set_accessibility_focusable(true);
SetAccessibleName(
l10n_util::GetStringUTF16(IDS_AURA_LAUNCHER_OVERFLOW_NAME));
}
OverflowButton::~OverflowButton() {
}
void OverflowButton::SetShelfAlignment(ShelfAlignment alignment) {
if (alignment_ == alignment)
return;
alignment_ = alignment;
SchedulePaint();
}
void OverflowButton::PaintBackground(gfx::Canvas* canvas, int alpha) {
gfx::Rect rect(GetContentsBounds());
rect = rect.Center(gfx::Size(kButtonHoverSize, kButtonHoverSize));
SkPaint paint;
paint.setAntiAlias(true);
paint.setStyle(SkPaint::kFill_Style);
paint.setColor(SkColorSetARGB(
kButtonHoverAlpha * hover_animation_->GetCurrentValue(),
0, 0, 0));
const SkScalar radius = SkIntToScalar(kButtonCornerRadius);
SkPath path;
path.addRoundRect(gfx::RectToSkRect(rect), radius, radius);
canvas->DrawPath(path, paint);
}
void OverflowButton::OnPaint(gfx::Canvas* canvas) {
if (hover_animation_->is_animating()) {
PaintBackground(
canvas,
kButtonHoverAlpha * hover_animation_->GetCurrentValue());
} else if (state() == BS_HOT || state() == BS_PUSHED) {
PaintBackground(canvas, kButtonHoverAlpha);
}
ui::Transform transform;
switch (alignment_) {
case SHELF_ALIGNMENT_BOTTOM:
// Shift 1 pixel left to align with overflow bubble tip.
transform.ConcatTranslate(-1, 0);
break;
case SHELF_ALIGNMENT_LEFT:
RotateClockwise(&transform);
transform.ConcatTranslate(width(), -1);
break;
case SHELF_ALIGNMENT_RIGHT:
RotateCounterclockwise(&transform);
transform.ConcatTranslate(0, height());
break;
}
canvas->Save();
canvas->Transform(transform);
gfx::Rect rect(GetContentsBounds());
canvas->DrawImageInt(*image_,
rect.x() + (rect.width() - image_->width()) / 2,
rect.y() + (rect.height() - image_->height()) / 2);
canvas->Restore();
}
} // namespace internal
} // namespace ash
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