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// Copyright (c) 2006-2008 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 VIEWS_PAINTER_H_
#define VIEWS_PAINTER_H_
#include <vector>
#include "base/basictypes.h"
#include "third_party/skia/include/core/SkColor.h"
class ChromeCanvas;
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 Painter {
public:
// 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,
ChromeCanvas* 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);
virtual ~Painter() {}
// Paints the painter in the specified region.
virtual void Paint(int w, int h, ChromeCanvas* canvas) = 0;
};
// ImagePainter paints 8 (or 9) images into a box. The four corner
// images are drawn at the size of the image, the top/left/bottom/right
// images are tiled to fit the area, and the center (if rendered) is
// stretched.
class ImagePainter : public Painter {
public:
enum BorderElements {
BORDER_TOP_LEFT = 0,
BORDER_TOP,
BORDER_TOP_RIGHT,
BORDER_RIGHT,
BORDER_BOTTOM_RIGHT,
BORDER_BOTTOM,
BORDER_BOTTOM_LEFT,
BORDER_LEFT,
BORDER_CENTER
};
// Constructs a new ImagePainter loading the specified image names.
// The images must be in the order defined by the BorderElements.
// If draw_center is false, there must be 8 image names, if draw_center
// is true, there must be 9 image names with the last giving the name
// of the center image.
ImagePainter(const int image_resource_names[],
bool draw_center);
virtual ~ImagePainter() {}
// Paints the images.
virtual void Paint(int w, int h, ChromeCanvas* canvas);
// Returns the specified image. The returned image should NOT be deleted.
SkBitmap* GetImage(BorderElements element) {
return images_[element];
}
private:
bool tile_;
bool draw_center_;
bool tile_center_;
// NOTE: the images are owned by ResourceBundle. Don't free them.
std::vector<SkBitmap*> images_;
DISALLOW_EVIL_CONSTRUCTORS(ImagePainter);
};
// 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 HorizontalPainter : public Painter {
public:
// 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, ChromeCanvas* canvas);
// Height of the images.
int height() const { return height_; }
private:
// The image chunks.
enum BorderElements {
LEFT,
CENTER,
RIGHT
};
// The height.
int height_;
// NOTE: the images are owned by ResourceBundle. Don't free them.
SkBitmap* images_[3];
DISALLOW_EVIL_CONSTRUCTORS(HorizontalPainter);
};
} // namespace views
#endif // VIEWS_PAINTER_H_
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