Move implementation of linux scrollbars from webkit using new

WebThemeEngine api. Also implement chromeos specific version.

BUG=chromium-os:6857
TEST=Verify that both linux and chromeos scrollbars look right.

Review URL: http://codereview.chromium.org/3618014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@62068 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 125 insertions, 0 deletions

diff --git a/gfx/native_theme_linux.h b/gfx/native_theme_linux.h
new file mode 100644
index 0000000..62a84e9
--- /dev/null
+++ b/gfx/native_theme_linux.h
@@ -0,0 +1,125 @@
+// Copyright (c) 2010 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.
+
+#ifndef GFX_NATIVE_THEME_LINUX_H_
+#define GFX_NATIVE_THEME_LINUX_H_
+
+#include "base/basictypes.h"
+#include "skia/ext/platform_canvas.h"
+
+namespace skia {
+class PlatformCanvas;
+}
+
+namespace gfx {
+class Rect;
+class Size;
+
+// Linux theming API.
+class NativeThemeLinux {
+ public:
+  // Gets our singleton instance.
+  static NativeThemeLinux* instance();
+
+  // The part to be painted / sized.
+  enum Part {
+    kScrollbarDownArrow,
+    kScrollbarLeftArrow,
+    kScrollbarRightArrow,
+    kScrollbarUpArrow,
+    kScrollbarHorizontalThumb,
+    kScrollbarVerticalThumb,
+    kScrollbarHorizontalTrack,
+    kScrollbarVerticalTrack
+  };
+
+  // The state of the part.
+  enum State {
+    kDisabled,
+    kHover,
+    kNormal,
+    kPressed,
+  };
+
+  // Extra data needed to draw scrollbar track correctly.
+  struct ScrollbarTrackExtraParams {
+    int track_x;
+    int track_y;
+    int track_width;
+    int track_height;
+  };
+
+  union ExtraParams {
+    ScrollbarTrackExtraParams scrollbar_track;
+  };
+
+  // Return the size of the part.
+  virtual gfx::Size GetSize(Part part) const;
+  // Paint the part to the canvas.
+  virtual void Paint(skia::PlatformCanvas* canvas,
+                     Part part,
+                     State state,
+                     const gfx::Rect& rect,
+                     const ExtraParams& extra);
+  // Supports theme specific colors.
+  void SetScrollbarColors(unsigned inactive_color,
+                          unsigned active_color,
+                          unsigned track_color) const;
+
+ protected:
+  NativeThemeLinux();
+  virtual ~NativeThemeLinux();
+
+  // Draw the arrow.
+  virtual void PaintArrowButton(
+      skia::PlatformCanvas* gc,
+      const gfx::Rect& rect,
+      Part direction,
+      State state);
+  // Paint the track. Done before the thumb so that it can contain alpha.
+  virtual void PaintTrack(skia::PlatformCanvas* canvas,
+                  Part part,
+                  State state,
+                  const ScrollbarTrackExtraParams& extra_params,
+                  const gfx::Rect& rect);
+  // Draw the thumb over the track.
+  virtual void PaintThumb(skia::PlatformCanvas* canvas,
+                  Part part,
+                  State state,
+                  const gfx::Rect& rect);
+
+ private:
+  void DrawVertLine(SkCanvas* canvas,
+                    int x,
+                    int y1,
+                    int y2,
+                    const SkPaint& paint) const;
+  void DrawHorizLine(SkCanvas* canvas,
+                     int x1,
+                     int x2,
+                     int y,
+                     const SkPaint& paint) const;
+  void DrawBox(SkCanvas* canvas,
+               const gfx::Rect& rect,
+               const SkPaint& paint) const;
+  SkScalar Clamp(SkScalar value,
+                 SkScalar min,
+                 SkScalar max) const;
+  SkColor SaturateAndBrighten(SkScalar* hsv,
+                              SkScalar saturate_amount,
+                              SkScalar brighten_amount) const;
+  SkColor OutlineColor(SkScalar* hsv1, SkScalar* hsv2) const;
+
+  static unsigned int scrollbar_width_;
+  static unsigned int button_length_;
+  static unsigned int thumb_inactive_color_;
+  static unsigned int thumb_active_color_;
+  static unsigned int track_color_;
+
+  DISALLOW_COPY_AND_ASSIGN(NativeThemeLinux);
+};
+
+}  // namespace gfx
+
+#endif  // GFX_NATIVE_THEME_LINUX_H_