Upstream: ui implementation in Android

ui/gfx/native_theme_android.h

+// Copyright (c) 2011 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 UI_GFX_NATIVE_THEME_ANDROID_H_
+#define UI_GFX_NATIVE_THEME_ANDROID_H_
+
+#include "base/basictypes.h"
+#include "skia/ext/platform_canvas.h"
+
+namespace gfx {
+class Rect;
+class Size;
+
+// Android theming API.
+class NativeThemeAndroid {
+ public:
+  // The part to be painted / sized.
+  enum Part {
+    SCROLLBAR_DOWN_ARROW,
+    SCROLLBAR_LEFT_ARROW,
+    SCROLLBAR_RIGHT_ARROW,
+    SCROLLBAR_UP_ARROW,
+    CHECKBOX,
+    RADIO,
+    PUSH_BUTTON,
+    TEXTFIELD,
+    MENU_LIST,
+    SLIDER_TRACK,
+    SLIDER_TNUMB,
+    INNER_SPIN_BUTTON,
+    PROGRESS_BAR,
+  };
+
+  // The state of the part.
+  enum State {
+    DISABLED,
+    HOVERED,
+    NORMAL,
+    PRESSED,
+  };
+
+  struct ButtonExtraParams {
+    bool checked;
+    bool indeterminate;  // Whether the button state is indeterminate.
+    bool is_default;     // Whether the button is default button.
+    bool has_border;
+    SkColor background_color;
+  };
+
+  struct TextFieldExtraParams {
+    bool is_text_area;
+    bool is_listbox;
+    SkColor background_color;
+  };
+
+  struct MenuListExtraParams {
+    bool has_border;
+    bool has_border_radius;
+    int arrow_x;
+    int arrow_y;
+    SkColor background_color;
+  };
+
+  struct SliderExtraParams {
+    bool vertical;
+    bool in_drag;
+  };
+
+  struct InnerSpinButtonExtraParams {
+    bool spin_up;
+    bool read_only;
+  };
+
+  struct ProgressBarExtraParams {
+    bool determinate;
+    int value_rect_x;
+    int value_rect_y;
+    int value_rect_width;
+    int value_rect_height;
+  };
+
+  union ExtraParams {
+    ButtonExtraParams button;
+    MenuListExtraParams menu_list;
+    SliderExtraParams slider;
+    TextFieldExtraParams text_field;
+    InnerSpinButtonExtraParams inner_spin;
+    ProgressBarExtraParams progress_bar;
+  };
+
+  // Gets our singleton instance.
+  static NativeThemeAndroid* instance();
+
+  // Return the size of the part.
+  gfx::Size GetPartSize(Part part) const;
+
+  // Paint the part to the canvas.
+  void Paint(SkCanvas* canvas,
+             Part part,
+             State state,
+             const gfx::Rect& rect,
+             const ExtraParams& extra);
+
+ private:
+  NativeThemeAndroid();
+  virtual ~NativeThemeAndroid();
+
+  // Draw the arrow. Used by scrollbar and inner spin button.
+  void PaintArrowButton(SkCanvas* gc,
+                        const gfx::Rect& rect,
+                        Part direction,
+                        State state);
+
+  // Draw the checkbox.
+  void PaintCheckbox(SkCanvas* canvas,
+                     State state,
+                     const gfx::Rect& rect,
+                     const ButtonExtraParams& button);
+
+  // Draw the radio.
+  void PaintRadio(SkCanvas* canvas,
+                  State state,
+                  const gfx::Rect& rect,
+                  const ButtonExtraParams& button);
+
+  // Draw the push button.
+  void PaintButton(SkCanvas* canvas,
+                   State state,
+                   const gfx::Rect& rect,
+                   const ButtonExtraParams& button);
+
+  // Draw the text field.
+  void PaintTextField(SkCanvas* canvas,
+                      State state,
+                      const gfx::Rect& rect,
+                      const TextFieldExtraParams& text);
+
+  // Draw the menu list.
+  void PaintMenuList(SkCanvas* canvas,
+                     State state,
+                     const gfx::Rect& rect,
+                     const MenuListExtraParams& menu_list);
+
+  // Draw the slider track.
+  void PaintSliderTrack(SkCanvas* canvas,
+                        State state,
+                        const gfx::Rect& rect,
+                        const SliderExtraParams& slider);
+
+  // Draw the slider thumb.
+  void PaintSliderThumb(SkCanvas* canvas,
+                        State state,
+                        const gfx::Rect& rect,
+                        const SliderExtraParams& slider);
+
+  // Draw the inner spin button.
+  void PaintInnerSpinButton(
+      SkCanvas* canvas,
+      State state,
+      const gfx::Rect& rect,
+      const InnerSpinButtonExtraParams& spin_button);
+
+  // Draw the progress bar.
+  void PaintProgressBar(
+      SkCanvas* canvas,
+      State state,
+      const gfx::Rect& rect,
+      const ProgressBarExtraParams& progress_bar);
+
+  // Return true if there is intersection between the |canvas| and the given
+  // rectangle.
+  bool IntersectsClipRectInt(SkCanvas* canvas,
+                             int x,
+                             int y,
+                             int w,
+                             int h);
+
+  // Draw the dest rectangle with the given bitmap which might be scaled if its
+  // size is not same as target rectangle.
+  void DrawBitmapInt(SkCanvas* canvas,
+                     const SkBitmap& bitmap,
+                     int src_x,
+                     int src_y,
+                     int src_w,
+                     int src_h,
+                     int dest_x,
+                     int dest_y,
+                     int dest_w,
+                     int dest_h);
+
+  // Draw the target rectangle with the |bitmap| accroding the given
+  // |tile_scale_x| and |tile_scale_y|
+  void DrawTiledImage(SkCanvas* canvas,
+                      const SkBitmap& bitmap,
+                      int src_x,
+                      int src_y,
+                      double tile_scale_x,
+                      double tile_scale_y,
+                      int dest_x,
+                      int dest_y,
+                      int w,
+                      int h) const;
+
+  // Return a new color which comes from the |hsv| by adjusting saturate and
+  // brighten according |saturate_amount| and |brighten_amount|
+  SkColor SaturateAndBrighten(SkScalar* hsv,
+                              SkScalar saturate_amount,
+                              SkScalar brighten_amount) const;
+
+  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;
+
+  // Return the |value| if it is between |min| and |max|, otherwise the |min|
+  // or |max| is returned dependent on which is mostly near the |value|.
+  SkScalar Clamp(SkScalar value, SkScalar min, SkScalar max) const;
+
+  // Used to return the color of scrollbar based on the color of thumb and
+  // track.
+  SkColor OutlineColor(SkScalar* hsv1, SkScalar* hsv2) const;
+
+  DISALLOW_COPY_AND_ASSIGN(NativeThemeAndroid);
+};
+
+}  // namespace gfx
+
+#endif  // UI_GFX_NATIVE_THEME_ANDROID_H_