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// Copyright 2016 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.
#import <Foundation/Foundation.h>
namespace web {
// Class to describe the viewport width or height.
class ViewportLength {
// Default constructor. Initializes values to false and NAN.
explicit ViewportLength();
// Constructor with the dimension value specified by the viewport tag.
// Possible valid values include "device-width", "device-height", or numerical
// strings.
ViewportLength(NSString* value);
// Accessors.
bool use_device_length() const { return use_device_length_; }
double value() const { return value_; }
// Whether the dimension is specified to use the device height/width.
bool use_device_length_;
// The hardcoded dimension value. Will be NAN if unspecified or if
// |use_device_length_| is true.
double value_;
// Class that describes the viewport meta tag of a page. The parsed values for
// this class correspond with the actual contents of viewport tag within the
// page's HTML. The zoom scale values are often different than those recorded
// in a page's PageZoomState, which correspond to the web view's scroll view
// zooming properties.
class PageViewportState {
// Default constructor. Initializes all bools to false and doubles to NAN.
explicit PageViewportState();
// Constructor with a viewport tag's content string.
explicit PageViewportState(NSString* viewport_content);
// Parses |viewport_content| and updates properties accordingly.
void UpdateWithViewportContent(NSString* const viewport_content);
// Accessors.
bool viewport_tag_present() const { return viewport_tag_present_; }
bool user_scalable() const { return user_scalable_; }
const ViewportLength& width() const { return width_; }
const ViewportLength& height() const { return height_; }
double minimum_zoom_scale() const { return minimum_zoom_scale_; }
double maximum_zoom_scale() const { return maximum_zoom_scale_; }
double initial_zoom_scale() const { return initial_zoom_scale_; }
// Whether the page has a viewport meta tag.
bool viewport_tag_present_;
// Whether the viewport tag allows user scalability. Defaults to true if the
// value is not found in the viewport tag's content.
bool user_scalable_;
// The specified width and height.
ViewportLength width_;
ViewportLength height_;
// The minimum, maximum, and initial zoom scales. These values are not always
// the same as those reported in PageZoomState, as web views render various
// viewport values differently. These values will be NAN if they aren't
// present in the extracted viewport tag.
double minimum_zoom_scale_;
double maximum_zoom_scale_;
double initial_zoom_scale_;
} // namespace web