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// 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 CHROME_BROWSER_VIEWS_BUBBLE_BORDER_H_
#define CHROME_BROWSER_VIEWS_BUBBLE_BORDER_H_
#include "third_party/skia/include/core/SkColor.h"
#include "views/background.h"
#include "views/border.h"
class SkBitmap;
// Renders a border, with optional arrow (off by default), and a custom
// dropshadow. This can be used to produce floating "bubble" objects.
//
// If the arrow is on, the bubble has four round corner. If not, it has round
// corners on the bottom and square corners on the top, and lacks a top border.
class BubbleBorder : public views::Border {
public:
// Possible locations for the (optional) arrow.
enum ArrowLocation {
NONE,
TOP_LEFT,
TOP_RIGHT,
BOTTOM_LEFT,
BOTTOM_RIGHT
};
BubbleBorder() : override_arrow_x_offset_(0),
arrow_location_(NONE),
background_color_(SK_ColorWHITE) {
InitClass();
}
// Returns the radius of the corner of the border.
static int GetCornerRadius() {
// We can't safely calculate a border radius by comparing the sizes of the
// side and corner images, because either may have been extended in various
// directions in order to do more subtle dropshadow fading or other effects.
// So we hardcode the most accurate value.
return 4;
}
// Sets the location for the arrow.
void set_arrow_location(ArrowLocation arrow_location) {
arrow_location_ = arrow_location;
}
// Sets a fixed x offset for the arrow. The arrow will still point to the
// same location but the bubble will shift horizontally to make that happen.
void set_arrow_offset(int offset) {
override_arrow_x_offset_ = offset;
}
// Sets the background color for the arrow body. This is irrelevant if you do
// not also set the arrow location to something other than NONE.
void set_background_color(SkColor background_color) {
background_color_ = background_color;
}
SkColor background_color() const { return background_color_; }
// For borders with an arrow, gives the desired bounds (in screen coordinates)
// given the rect to point to and the size of the contained contents. This
// depends on the arrow location, so if you change that, you should call this
// again to find out the new coordinates.
//
// For borders without an arrow, gives the bounds with the content centered
// underneath the supplied rect.
gfx::Rect GetBounds(const gfx::Rect& position_relative_to,
const gfx::Size& contents_size) const;
// Overridden from views::Border:
virtual void GetInsets(gfx::Insets* insets) const;
private:
// Loads images if necessary.
static void InitClass();
virtual ~BubbleBorder() { }
// Returns true if there is an arrow and it is positioned on the bottom edge.
bool arrow_is_bottom() const {
return (arrow_location_ == BOTTOM_LEFT) ||
(arrow_location_ == BOTTOM_RIGHT);
}
// Returns true if there is an arrow and it is positioned on the left side.
bool arrow_is_left() const {
return (arrow_location_ == TOP_LEFT) || (arrow_location_ == BOTTOM_LEFT);
}
// Overridden from views::Border:
virtual void Paint(const views::View& view, gfx::Canvas* canvas) const;
// Border graphics.
static SkBitmap* left_;
static SkBitmap* top_left_;
static SkBitmap* top_;
static SkBitmap* top_right_;
static SkBitmap* right_;
static SkBitmap* bottom_right_;
static SkBitmap* bottom_;
static SkBitmap* bottom_left_;
static SkBitmap* top_arrow_;
static SkBitmap* bottom_arrow_;
static int arrow_x_offset_;
// If specified, overrides the pre-calculated |arrow_x_offset_| of the arrow.
int override_arrow_x_offset_;
ArrowLocation arrow_location_;
SkColor background_color_;
DISALLOW_COPY_AND_ASSIGN(BubbleBorder);
};
// A Background that clips itself to the specified BubbleBorder and uses
// the background color of the BubbleBorder.
class BubbleBackground : public views::Background {
public:
explicit BubbleBackground(BubbleBorder* border) : border_(border) {}
// Background overrides.
virtual void Paint(gfx::Canvas* canvas, views::View* view) const;
private:
BubbleBorder* border_;
DISALLOW_COPY_AND_ASSIGN(BubbleBackground);
};
#endif // CHROME_BROWSER_VIEWS_BUBBLE_BORDER_H_
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