1// Copyright 2013 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "ui/views/shadow_border.h"
6
7#include "ui/gfx/canvas.h"
8#include "ui/gfx/insets.h"
9#include "ui/gfx/rect.h"
10#include "ui/gfx/shadow_value.h"
11#include "ui/gfx/skia_util.h"
12#include "ui/views/view.h"
13
14namespace views {
15
16ShadowBorder::ShadowBorder(int blur,
17                           SkColor color,
18                           int vertical_offset,
19                           int horizontal_offset)
20    : views::Border(),
21      blur_(blur),
22      color_(color),
23      vertical_offset_(vertical_offset),
24      horizontal_offset_(horizontal_offset) {}
25
26ShadowBorder::~ShadowBorder() {}
27
28// TODO(sidharthms): Re-painting a shadow looper on every paint call may yield
29// poor performance. Ideally we should be caching the border to bitmaps.
30void ShadowBorder::Paint(const views::View& view, gfx::Canvas* canvas) {
31  SkPaint paint;
32  std::vector<gfx::ShadowValue> shadows;
33  shadows.push_back(gfx::ShadowValue(gfx::Point(), blur_, color_));
34  skia::RefPtr<SkDrawLooper> looper = gfx::CreateShadowDrawLooper(shadows);
35  paint.setLooper(looper.get());
36  paint.setColor(SK_ColorTRANSPARENT);
37  paint.setStrokeJoin(SkPaint::kRound_Join);
38  gfx::Rect bounds(view.size());
39  // TODO(pkasting): This isn't right if one of the offsets is larger than
40  // (blur_ / 2).
41  bounds.Inset(gfx::Insets(blur_ / 2, blur_ / 2, blur_ / 2, blur_ / 2));
42  canvas->DrawRect(bounds, paint);
43}
44
45gfx::Insets ShadowBorder::GetInsets() const {
46  return gfx::Insets(blur_ / 2 - vertical_offset_,
47                     blur_ / 2 - horizontal_offset_,
48                     blur_ / 2 + vertical_offset_,
49                     blur_ / 2 + horizontal_offset_);
50}
51
52gfx::Size ShadowBorder::GetMinimumSize() const {
53  return gfx::Size(blur_, blur_);
54}
55
56}  // namespace views
57