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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 <memory>
- #include "build/build_config.h"
- #include "third_party/skia/include/core/SkColor.h"
- #include "ui/base/themed_vector_icon.h"
- #include "ui/color/color_id.h"
- #include "ui/gfx/color_palette.h"
- #include "ui/views/views_export.h"
- namespace gfx {
- class Canvas;
- }
- namespace ui {
- class ThemedVectorIcon;
- }
- 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();
- Background(const Background&) = delete;
- Background& operator=(const Background&) = delete;
- virtual ~Background();
- // 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);
- // This is called by the View on which it is attached. This is overridden for
- // subclasses that depend on theme colors.
- virtual void OnViewThemeChanged(View* view);
- // 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_ = gfx::kPlaceholderColor;
- };
- // Creates a background that fills the canvas in the specified color.
- VIEWS_EXPORT std::unique_ptr<Background> CreateSolidBackground(SkColor color);
- // Creates a background that fills the canvas with rounded corners.
- // If using a rounded rect border as well, pass its radius as `radius` and its
- // thickness as `for_border_thickness`. This will inset the background properly
- // so it doesn't bleed through the border.
- VIEWS_EXPORT std::unique_ptr<Background> CreateRoundedRectBackground(
- SkColor color,
- float radius,
- int for_border_thickness = 0);
- // Same as above except it uses the color specified by the views's ColorProvider
- // and the given color identifier.
- VIEWS_EXPORT std::unique_ptr<Background> CreateThemedRoundedRectBackground(
- ui::ColorId color_id,
- float radius,
- int for_border_thickness = 0);
- // Creates a background that fills the canvas in the color specified by the
- // view's ColorProvider and the given color identifier.
- VIEWS_EXPORT std::unique_ptr<Background> CreateThemedSolidBackground(
- ui::ColorId color_id);
- // Creates a background from the specified Painter.
- VIEWS_EXPORT std::unique_ptr<Background> CreateBackgroundFromPainter(
- std::unique_ptr<Painter> painter);
- // Creates a background from the specified ThemedVectorIcon.
- VIEWS_EXPORT std::unique_ptr<Background> CreateThemedVectorIconBackground(
- const ui::ThemedVectorIcon& icon);
- } // namespace views
- #endif // UI_VIEWS_BACKGROUND_H_
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