ui/base/cocoa/three_part_image.h

   1 // Copyright 2015 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_BASE_COCOA_THREE_PART_IMAGE_H
   6 #define UI_BASE_COCOA_THREE_PART_IMAGE_H
   7
   8 #import <Cocoa/Cocoa.h>
   9
  10 #include "base/mac/scoped_nsobject.h"
  11 #include "ui/base/ui_base_export.h"
  12
  13 namespace ui {
  14
  15 // A wrapper around NSDrawThreePartImage that caches the images.
  16 // The middle image is optional.
  17 // Vertical orientation is not currently supported.
  18 class UI_BASE_EXPORT ThreePartImage {
  19  public:
  20   // |left_id|, |middle_id|, and |right_id| are ResourceBundle image
  21   // identifiers. Specify 0 for |middle_id| if there is no middle image.
  22   ThreePartImage(int left_id, int middle_id, int right_id);
  23   ~ThreePartImage();
  24
  25   // Returns the image rects if drawn in |bounds|.
  26   NSRect GetLeftRect(NSRect bounds) const;
  27   NSRect GetMiddleRect(NSRect bounds) const;
  28   NSRect GetRightRect(NSRect bounds) const;
  29
  30   // Draws the three part image inside |rect|.
  31   void DrawInRect(NSRect rect, NSCompositingOperation op, CGFloat alpha) const;
  32
  33   // Returns YES if |point| is in a non-transparent part of the images.
  34   // Returns YES if |point| is inside the middle rect and there is no middle
  35   // image.
  36   BOOL HitTest(NSPoint point, NSRect bounds) const;
  37
  38  private:
  39   // Returns YES if |point| is in a non-transparent part of |image|.
  40   BOOL HitTestImage(NSPoint point, NSImage* image, NSRect imageRect) const;
  41
  42   base::scoped_nsobject<NSImage> leftImage_;
  43   base::scoped_nsobject<NSImage> middleImage_;
  44   base::scoped_nsobject<NSImage> rightImage_;
  45   NSSize leftSize_;
  46   NSSize rightSize_;
  47
  48   DISALLOW_COPY_AND_ASSIGN(ThreePartImage);
  49 };
  50
  51 }  // namespace ui
  52
  53 #endif  // UI_BASE_COCOA_THREE_PART_IMAGE_H