Changes look for scrollbars on windows (2)

ui/native_theme/native_theme_aurawin.cc

+// Copyright 2014 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/native_theme/native_theme_aurawin.h"
+
+#include "grit/ui_resources.h"
+#include "third_party/skia/include/core/SkCanvas.h"
+#include "ui/base/nine_image_painter_factory.h"
+#include "ui/base/resource/resource_bundle.h"
+#include "ui/gfx/canvas.h"
+#include "ui/gfx/nine_image_painter.h"
+#include "ui/gfx/skia_util.h"
+#include "ui/gfx/win/dpi.h"
+#include "ui/native_theme/common_theme.h"
+#include "ui/native_theme/native_theme_win.h"
+
+using gfx::NineImagePainter;
+
+#define EMPTY_IMAGE_GRID { 0, 0, 0, 0, 0, 0, 0, 0, 0 }
+
+namespace ui {
+
+namespace {
+
+const int kScrollbarThumbImages[NativeTheme::kMaxState][9] = {
+  EMPTY_IMAGE_GRID,
+  IMAGE_GRID(IDR_SCROLLBAR_THUMB_BASE_HOVER),
+  IMAGE_GRID(IDR_SCROLLBAR_THUMB_BASE_NORMAL),
+  IMAGE_GRID(IDR_SCROLLBAR_THUMB_BASE_PRESSED)
+};
+
+const int kScrollbarArrowButtonImages[NativeTheme::kMaxState][9] = {
+  EMPTY_IMAGE_GRID,
+  IMAGE_GRID(IDR_SCROLLBAR_ARROW_BUTTON_BASE_HOVER),
+  IMAGE_GRID(IDR_SCROLLBAR_ARROW_BUTTON_BASE_NORMAL),
+  IMAGE_GRID(IDR_SCROLLBAR_ARROW_BUTTON_BASE_PRESSED)
+};
+
+const int kScrollbarTrackImages[9] = IMAGE_GRID(IDR_SCROLLBAR_BASE);
+
+}  // namespace
+
+// static
+NativeTheme* NativeTheme::instance() {
+  return NativeThemeAuraWin::instance();
+}
+
+// static
+NativeThemeAura* NativeThemeAura::instance() {
+  return NativeThemeAuraWin::instance();
+}
+
+// static
+NativeThemeAuraWin* NativeThemeAuraWin::instance() {
+  CR_DEFINE_STATIC_LOCAL(NativeThemeAuraWin, s_native_theme, ());
+  return &s_native_theme;
+}
+
+NativeThemeAuraWin::NativeThemeAuraWin() {
+  // Image declarations assume the following order.
+  COMPILE_ASSERT(kDisabled == 0, states_unexepctedly_changed);
+  COMPILE_ASSERT(kHovered == 1, states_unexepctedly_changed);
+  COMPILE_ASSERT(kNormal == 2, states_unexepctedly_changed);
+  COMPILE_ASSERT(kPressed == 3, states_unexepctedly_changed);
+  COMPILE_ASSERT(kMaxState == 4, states_unexepctedly_changed);
+}
+
+NativeThemeAuraWin::~NativeThemeAuraWin() {
+}
+
+gfx::Size NativeThemeAuraWin::GetPartSize(Part part,
+                                          State state,
+                                          const ExtraParams& extra) const {
+  gfx::Size part_size = CommonThemeGetPartSize(part, state, extra);
+  if (!part_size.IsEmpty())
+    return part_size;
+
+  // We want aura on windows to use the same size for scrollbars as we would in
+  // the native theme.
+  switch (part) {
+    case kScrollbarDownArrow:
+    case kScrollbarLeftArrow:
+    case kScrollbarRightArrow:
+    case kScrollbarUpArrow:
+    case kScrollbarHorizontalThumb:
+    case kScrollbarVerticalThumb:
+    case kScrollbarHorizontalTrack:
+    case kScrollbarVerticalTrack:
+      return NativeThemeWin::instance()->GetPartSize(part, state, extra);
+    default:
+      break;
+  }
+
+  return NativeThemeAura::GetPartSize(part, state, extra);
+}
+
+void NativeThemeAuraWin::PaintArrowButton(
+      SkCanvas* gc,
+      const gfx::Rect& rect,
+      Part direction,
+      State state) const {
+  if (direction == kInnerSpinButton) {
+    NativeThemeAura::PaintArrowButton(gc, rect, direction, state);
+    return;
+  }
+  PaintPainter(GetOrCreatePainter(
+                   kScrollbarArrowButtonImages, state,
+                   scrollbar_arrow_button_painters_),
+               gc, rect);
+
+  // The arrow is slightly offset to better balance with the thumb.
+  gfx::Rect arrow_rect(rect);
+  if (direction == kScrollbarDownArrow || direction == kScrollbarUpArrow)
+    arrow_rect.Offset(1, 0);
+  else
+    arrow_rect.Offset(0, 1);
+
+  // Aura-win uses slightly different arrow colors.
+  SkColor arrow_color = GetArrowColor(state);
+  switch (state) {
+    case kHovered:
+    case kNormal:
+      arrow_color = SkColorSetRGB(0x50, 0x50, 0x50);
+      break;
+    case kPressed:
+      arrow_color = SK_ColorWHITE;
+    default:
+      break;
+  }
+  PaintArrow(gc, arrow_rect, direction, arrow_color);
+}
+
+void NativeThemeAuraWin::PaintScrollbarTrack(
+    SkCanvas* sk_canvas,
+    Part part,
+    State state,
+    const ScrollbarTrackExtraParams& extra_params,
+    const gfx::Rect& rect) const {
+  if (!scrollbar_track_painter_)
+    scrollbar_track_painter_ = CreateNineImagePainter(kScrollbarTrackImages);
+  PaintPainter(scrollbar_track_painter_.get(), sk_canvas, rect);
+}
+
+void NativeThemeAuraWin::PaintScrollbarThumb(SkCanvas* sk_canvas,
+                                             Part part,
+                                             State state,
+                                             const gfx::Rect& rect) const {
+  gfx::Rect thumb_rect(rect);
+  if (part == NativeTheme::kScrollbarVerticalThumb)
+    thumb_rect.Inset(3, 0, 1, 0);
+  else
+    thumb_rect.Inset(0, 3, 0, 1);
+  PaintPainter(GetOrCreatePainter(
+                   kScrollbarThumbImages, state, scrollbar_thumb_painters_),
+               sk_canvas, thumb_rect);
+}
+
+NineImagePainter* NativeThemeAuraWin::GetOrCreatePainter(
+    const int images[kMaxState][9],
+    State state,
+    scoped_ptr<NineImagePainter> painters[kMaxState]) const {
+  if (painters[state])
+    return painters[state].get();
+  if (images[state][0] == 0) {
+    // Must always provide normal state images.
+    DCHECK_NE(kNormal, state);
+    return GetOrCreatePainter(images, kNormal, painters);
+  }
+  painters[state] = CreateNineImagePainter(images[state]);
+  return painters[state].get();
+}
+
+void NativeThemeAuraWin::PaintPainter(NineImagePainter* painter,
+                                      SkCanvas* sk_canvas,
+                                      const gfx::Rect& rect) const {
+  DCHECK(painter);
+  scoped_ptr<gfx::Canvas> canvas(CreateCanvas(sk_canvas));
+  painter->Paint(canvas.get(), rect);
+}
+
+}  // namespace ui