Index: ui/native_theme/native_theme_aura.cc |
diff --git a/ui/native_theme/native_theme_aura.cc b/ui/native_theme/native_theme_aura.cc |
index 0c3255cb18b6749ccadab206376634289dce1b76..208f06ac89d24125baab3d6a12cfaf41d8e068ee 100644 |
--- a/ui/native_theme/native_theme_aura.cc |
+++ b/ui/native_theme/native_theme_aura.cc |
@@ -34,6 +34,8 @@ namespace { |
// this painting code are defined in overlay_scrollbar_constants_aura.h. |
constexpr int kOverlayScrollbarStrokeWidth = 1; |
constexpr int kOverlayScrollbarMinimumLength = 12; |
+const gfx::Size kOverlayScrollbarNinePatchCanvasSize(5, 5); |
Evan Stade
2017/03/02 02:32:01
sorry, what I actually meant here was something li
bokan
2017/03/02 13:55:36
Ah, that does sound better. Done (names slightly a
|
+const gfx::Rect kOverlayScrollbarNinePatchAperture(2, 2, 1, 1); |
const SkColor kTrackColor = SkColorSetRGB(0xF1, 0xF1, 0xF1); |
@@ -317,4 +319,29 @@ gfx::Size NativeThemeAura::GetPartSize(Part part, |
return NativeThemeBase::GetPartSize(part, state, extra); |
} |
+bool NativeThemeAura::SupportsNinePatch(Part part) const { |
+ if (!IsOverlayScrollbarEnabled()) |
+ return false; |
+ |
+ return part == kScrollbarHorizontalThumb || part == kScrollbarVerticalThumb; |
+} |
+ |
+gfx::Size NativeThemeAura::GetNinePatchCanvasSize(Part part) const { |
+ DCHECK(SupportsNinePatch(part)); |
+ |
+ // 2 pixel border with 1 pixel center patch. The border is 2 pixels so that |
+ // the inner pixel can match the center tile color. This prevents color |
+ // interpolation between the patches. |
+ return kOverlayScrollbarNinePatchCanvasSize; |
+} |
+ |
+gfx::Rect NativeThemeAura::GetNinePatchAperture(Part part) const { |
+ DCHECK(SupportsNinePatch(part)); |
+ |
+ // The aperture is a single pixel surrounded by a non-resizing 2 pixel border. |
+ // The stroke is actually only 1 pixel wide but we need to use 2 pixels so |
+ // that the center patch doesn't try to blend colors between patches. |
+ return kOverlayScrollbarNinePatchAperture; |
+} |
+ |
} // namespace ui |