DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Implementation

Mercurial (1aeaa33a64f9)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef nsViewportInfo_h___
#define nsViewportInfo_h___

#include <stdint.h>
#include "mozilla/Attributes.h"
#include "Units.h"

/**
 * Default values for the nsViewportInfo class.
 */
static const mozilla::LayoutDeviceToScreenScale kViewportMinScale(0.1f);
static const mozilla::LayoutDeviceToScreenScale kViewportMaxScale(10.0f);
static const mozilla::CSSIntSize kViewportMinSize(200, 40);
static const mozilla::CSSIntSize kViewportMaxSize(10000, 10000);

/**
 * Information retrieved from the <meta name="viewport"> tag. See
 * nsIDocument::GetViewportInfo for more information on this functionality.
 */
class MOZ_STACK_CLASS nsViewportInfo {
 public:
  nsViewportInfo(const mozilla::ScreenIntSize& aDisplaySize,
                 const mozilla::CSSToScreenScale& aDefaultZoom, bool aAllowZoom)
      : mDefaultZoomValid(true),
        mDefaultZoom(aDefaultZoom),
        mAutoSize(true),
        mAllowZoom(aAllowZoom) {
    mSize = mozilla::ScreenSize(aDisplaySize) / mDefaultZoom;
    mozilla::CSSToLayoutDeviceScale pixelRatio(1.0f);
    mMinZoom = pixelRatio * kViewportMinScale;
    mMaxZoom = pixelRatio * kViewportMaxScale;
    ConstrainViewportValues();
  }

  nsViewportInfo(const mozilla::CSSToScreenScale& aDefaultZoom,
                 const mozilla::CSSToScreenScale& aMinZoom,
                 const mozilla::CSSToScreenScale& aMaxZoom,
                 const mozilla::CSSSize& aSize, bool aAutoSize, bool aAllowZoom)
      : mDefaultZoomValid(true),
        mDefaultZoom(aDefaultZoom),
        mMinZoom(aMinZoom),
        mMaxZoom(aMaxZoom),
        mSize(aSize),
        mAutoSize(aAutoSize),
        mAllowZoom(aAllowZoom) {
    ConstrainViewportValues();
  }

  bool IsDefaultZoomValid() const { return mDefaultZoomValid; }
  mozilla::CSSToScreenScale GetDefaultZoom() const { return mDefaultZoom; }
  mozilla::CSSToScreenScale GetMinZoom() const { return mMinZoom; }
  mozilla::CSSToScreenScale GetMaxZoom() const { return mMaxZoom; }

  mozilla::CSSSize GetSize() const { return mSize; }

  bool IsAutoSizeEnabled() const { return mAutoSize; }
  bool IsZoomAllowed() const { return mAllowZoom; }

 private:
  /**
   * Constrain the viewport calculations from the
   * nsIDocument::GetViewportInfo() function in order to always return
   * sane minimum/maximum values.
   */
  void ConstrainViewportValues();

  // If the default zoom was specified and was between the min and max
  // zoom values.
  bool mDefaultZoomValid;

  // Default zoom indicates the level at which the display is 'zoomed in'
  // initially for the user, upon loading of the page.
  mozilla::CSSToScreenScale mDefaultZoom;

  // The minimum zoom level permitted by the page.
  mozilla::CSSToScreenScale mMinZoom;

  // The maximum zoom level permitted by the page.
  mozilla::CSSToScreenScale mMaxZoom;

  // The size of the viewport, specified by the <meta name="viewport"> tag.
  mozilla::CSSSize mSize;

  // Whether or not we should automatically size the viewport to the device's
  // width. This is true if the document has been optimized for mobile, and
  // the width property of a specified <meta name="viewport"> tag is either
  // not specified, or is set to the special value 'device-width'.
  bool mAutoSize;

  // Whether or not the user can zoom in and out on the page. Default is true.
  bool mAllowZoom;
};

#endif