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// 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.
#pragma once
#include "base/basictypes.h"
#include "third_party/skia/include/core/SkColor.h"
#include "views/views_export.h"
namespace gfx {
class Canvas;
class Insets;
class SkBitmap;
namespace views {
// Painter, as the name implies, is responsible for painting in a particular
// region. Think of Painter as a Border or Background that can be painted
// in any region of a View.
class VIEWS_EXPORT Painter {
// A convenience method for painting a Painter in a particular region.
// This translates the canvas to x/y and paints the painter.
static void PaintPainterAt(int x, int y, int w, int h,
gfx::Canvas* canvas, Painter* painter);
// Creates a painter that draws a gradient between the two colors.
static Painter* CreateHorizontalGradient(SkColor c1, SkColor c2);
static Painter* CreateVerticalGradient(SkColor c1, SkColor c2);
// Creates a painter that divides |image| into nine regions. The four corners
// are rendered at the size specified in insets (for example, the upper
// left corners is rendered at 0x0 with a size of
// insets.left()xinsets.right()). The four edges are stretched to fill the
// destination size.
// Ownership is passed to the caller.
static Painter* CreateImagePainter(const SkBitmap& image,
const gfx::Insets& insets,
bool paint_center);
virtual ~Painter() {}
// Paints the painter in the specified region.
virtual void Paint(int w, int h, gfx::Canvas* canvas) = 0;
// HorizontalPainter paints 3 images into a box: left, center and right. The
// left and right images are drawn to size at the left/right edges of the
// region. The center is tiled in the remaining space. All images must have the
// same height.
class VIEWS_EXPORT HorizontalPainter : public Painter {
// Constructs a new HorizontalPainter loading the specified image names.
// The images must be in the order left, right and center.
explicit HorizontalPainter(const int image_resource_names[]);
virtual ~HorizontalPainter() {}
// Paints the images.
virtual void Paint(int w, int h, gfx::Canvas* canvas);
// Height of the images.
int height() const { return height_; }
// The image chunks.
enum BorderElements {
// The height.
int height_;
// NOTE: the images are owned by ResourceBundle. Don't free them.
SkBitmap* images_[3];
} // namespace views
#endif // VIEWS_PAINTER_H_