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// Copyright (c) 2012 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_VIEWS_BACKGROUND_H_
#define UI_VIEWS_BACKGROUND_H_
#include <stddef.h>
#include "base/macros.h"
#include "build/build_config.h"
#include "third_party/skia/include/core/SkColor.h"
#include "ui/views/views_export.h"
#if defined(OS_WIN)
#include <windows.h>
#endif // defined(OS_WIN)
namespace gfx {
class Canvas;
}
namespace views {
class Painter;
class View;
/////////////////////////////////////////////////////////////////////////////
//
// Background class
//
// A background implements a way for views to paint a background. The
// background can be either solid or based on a gradient. Of course,
// Background can be subclassed to implement various effects.
//
// Any View can have a background. See View::SetBackground() and
// View::OnPaintBackground()
//
/////////////////////////////////////////////////////////////////////////////
class VIEWS_EXPORT Background {
public:
Background();
virtual ~Background();
// Creates a background that fills the canvas in the specified color.
static Background* CreateSolidBackground(SkColor color);
// Creates a background that fills the canvas in the specified color.
static Background* CreateSolidBackground(int r, int g, int b) {
return CreateSolidBackground(SkColorSetRGB(r, g, b));
}
// Creates a background that fills the canvas in the specified color.
static Background* CreateSolidBackground(int r, int g, int b, int a) {
return CreateSolidBackground(SkColorSetARGB(a, r, g, b));
}
// Creates a background that contains a vertical gradient that varies
// from |color1| to |color2|
static Background* CreateVerticalGradientBackground(SkColor color1,
SkColor color2);
// Creates a background that contains a vertical gradient. The gradient can
// have multiple |colors|. The |pos| array contains the relative positions of
// each corresponding color. |colors| and |pos| must be the same size. The
// first element in |pos| must be 0.0 and the last element must be 1.0.
// |count| contains the number of elements in |colors| and |pos|.
static Background* CreateVerticalMultiColorGradientBackground(SkColor* colors,
SkScalar* pos,
size_t count);
// Creates Chrome's standard panel background
static Background* CreateStandardPanelBackground();
// Creates a Background from the specified Painter. If owns_painter is
// true, the Painter is deleted when the Border is deleted.
static Background* CreateBackgroundPainter(bool owns_painter,
Painter* painter);
// Render the background for the provided view
virtual void Paint(gfx::Canvas* canvas, View* view) const = 0;
// Set a solid, opaque color to be used when drawing backgrounds of native
// controls. Unfortunately alpha=0 is not an option.
void SetNativeControlColor(SkColor color);
// Returns the "background color". This is equivalent to the color set in
// SetNativeControlColor(). For solid backgrounds, this is the color; for
// gradient backgrounds, it's the midpoint of the gradient; for painter
// backgrounds, this is not useful (returns a default color).
SkColor get_color() const { return color_; }
private:
SkColor color_;
DISALLOW_COPY_AND_ASSIGN(Background);
};
} // namespace views
#endif // UI_VIEWS_BACKGROUND_H_
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