ui/aura_extra/image_window_delegate.h

   1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef UI_AURA_EXTRA_IMAGE_WINDOW_DELEGATE_H_
   6 #define UI_AURA_EXTRA_IMAGE_WINDOW_DELEGATE_H_
   7
   8 #include "third_party/skia/include/core/SkColor.h"
   9 #include "ui/aura/window_delegate.h"
  10 #include "ui/aura_extra/aura_extra_export.h"
  11 #include "ui/gfx/geometry/size.h"
  12 #include "ui/gfx/geometry/vector2d.h"
  13 #include "ui/gfx/image/image.h"
  14
  15 namespace aura_extra {
  16
  17 // An ImageWindowDelegate paints an image for a Window, possibly also filling
  18 // the window with a specified backround color. The delegate does not consume
  19 // any event.
  20 //
  21 // The delegate destroys itself when the Window is destroyed. This is done in
  22 // |OnWindowDestroyed()| function which subclasses can override to prevent
  23 // self-destroying.
  24 class AURA_EXTRA_EXPORT ImageWindowDelegate : public aura::WindowDelegate {
  25  public:
  26   ImageWindowDelegate();
  27
  28   void SetImage(const gfx::Image& image);
  29
  30   void set_background_color(SkColor color) { background_color_ = color; }
  31   void set_image_offset(const gfx::Vector2d& offset) { offset_ = offset; }
  32
  33   bool has_image() const { return !image_.IsEmpty(); }
  34
  35  protected:
  36   ~ImageWindowDelegate() override;
  37
  38   // Overridden from aura::WindowDelegate:
  39   gfx::Size GetMinimumSize() const override;
  40   gfx::Size GetMaximumSize() const override;
  41   void OnBoundsChanged(const gfx::Rect& old_bounds,
  42                        const gfx::Rect& new_bounds) override;
  43   gfx::NativeCursor GetCursor(const gfx::Point& point) override;
  44   int GetNonClientComponent(const gfx::Point& point) const override;
  45   bool ShouldDescendIntoChildForEventHandling(
  46       aura::Window* child,
  47       const gfx::Point& location) override;
  48   bool CanFocus() override;
  49   void OnCaptureLost() override;
  50   void OnPaint(const ui::PaintContext& context) override;
  51   void OnDeviceScaleFactorChanged(float device_scale_factor) override;
  52   void OnWindowDestroying(aura::Window* window) override;
  53   void OnWindowDestroyed(aura::Window* window) override;
  54   void OnWindowTargetVisibilityChanged(bool visible) override;
  55   bool HasHitTestMask() const override;
  56   void GetHitTestMask(gfx::Path* mask) const override;
  57
  58  protected:
  59   SkColor background_color_;
  60   gfx::Image image_;
  61   gfx::Vector2d offset_;
  62
  63   gfx::Size window_size_;
  64
  65   // Keeps track of whether the window size matches the image size or not. If
  66   // the image size is smaller than the window size, then the delegate fills the
  67   // missing regions with |background_color_| (defult is white).
  68   bool size_mismatch_;
  69
  70   DISALLOW_COPY_AND_ASSIGN(ImageWindowDelegate);
  71 };
  72
  73 }  // namespace aura_extra
  74
  75 #endif  // UI_AURA_EXTRA_IMAGE_WINDOW_DELEGATE_H_