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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 "ash/shelf/shelf_layout_manager.h"
#include "grit/ash_resources.h"
#include "grit/ash_strings.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"
#include "ui/views/widget/widget.h"
namespace ash {
namespace internal {
namespace {
const int kButtonHoverAlpha = 150;
const int kButtonCornerRadius = 2;
const int kButtonHoverSize = 28;
const int kBackgroundOffset = (48 - kButtonHoverSize) / 2;
void RotateCounterclockwise(gfx::Transform* transform) {
SkMatrix44 rotation;
rotation.set3x3(0, -1, 0,
1, 0, 0,
0, 0, 1);
transform->matrix().preConcat(rotation);
}
void RotateClockwise(gfx::Transform* transform) {
SkMatrix44 rotation;
rotation.set3x3( 0, 1, 0,
-1, 0, 0,
0, 0, 1);
transform->matrix().preConcat(rotation);
}
} // namesapce
OverflowButton::OverflowButton(views::ButtonListener* listener)
: CustomButton(listener),
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::OnShelfAlignmentChanged() {
SchedulePaint();
}
void OverflowButton::PaintBackground(gfx::Canvas* canvas, int alpha) {
gfx::Rect bounds(GetContentsBounds());
gfx::Rect rect(0, 0, kButtonHoverSize, kButtonHoverSize);
ShelfLayoutManager* shelf =
ShelfLayoutManager::ForLauncher(GetWidget()->GetNativeView());
// Nudge the background a little to line up right.
if (shelf->IsHorizontalAlignment()) {
rect.set_origin(gfx::Point(
bounds.x() + ((bounds.width() - kButtonHoverSize) / 2) - 1,
bounds.y() + kBackgroundOffset - 1));
} else {
rect.set_origin(gfx::Point(
bounds.x() + kBackgroundOffset - 1,
bounds.y() + ((bounds.height() - kButtonHoverSize) / 2) - 1));
}
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) {
ShelfAlignment alignment = ShelfLayoutManager::ForLauncher(
GetWidget()->GetNativeView())->GetAlignment();
if (hover_animation_->is_animating()) {
PaintBackground(
canvas,
kButtonHoverAlpha * hover_animation_->GetCurrentValue());
} else if (state() == STATE_HOVERED || state() == STATE_PRESSED) {
PaintBackground(canvas, kButtonHoverAlpha);
}
if (height() < kButtonHoverSize)
return;
gfx::Transform transform;
switch (alignment) {
case SHELF_ALIGNMENT_BOTTOM:
// Shift 1 pixel left to align with overflow bubble tip.
transform.Translate(-1, kBackgroundOffset);
break;
case SHELF_ALIGNMENT_LEFT:
transform.Translate(kBackgroundOffset, -1);
RotateClockwise(&transform);
break;
case SHELF_ALIGNMENT_RIGHT:
transform.Translate(kBackgroundOffset, height());
RotateCounterclockwise(&transform);
break;
case SHELF_ALIGNMENT_TOP:
transform.Translate(1, kBackgroundOffset);
break;
}
canvas->Save();
canvas->Transform(transform);
gfx::Rect rect(GetContentsBounds());
if (alignment == SHELF_ALIGNMENT_BOTTOM ||
alignment == SHELF_ALIGNMENT_TOP) {
canvas->DrawImageInt(*image_,
rect.x() + (rect.width() - image_->width()) / 2,
kButtonHoverSize - image_->height());
} else {
canvas->DrawImageInt(*image_,
kButtonHoverSize - image_->width(),
rect.y() + (rect.height() - image_->height()) / 2);
}
canvas->Restore();
}
} // namespace internal
} // namespace ash
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