15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Copyright (c) 2012 The Chromium Authors. All rights reserved. 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// found in the LICENSE file. 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 55821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifndef CONTENT_PUBLIC_COMMON_PAGE_ZOOM_H_ 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define CONTENT_PUBLIC_COMMON_PAGE_ZOOM_H_ 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "content/common/content_export.h" 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace content { 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// This enum is the parameter to various text/page zoom commands so we know 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// what the specific zoom command is. 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)enum PageZoom { 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) PAGE_ZOOM_OUT = -1, 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) PAGE_ZOOM_RESET = 0, 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) PAGE_ZOOM_IN = 1, 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// The minimum zoom factor permitted for a page. This is an alternative to 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// WebView::minTextSizeMultiplier. 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)CONTENT_EXPORT extern const double kMinimumZoomFactor; 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// The maximum zoom factor permitted for a page. This is an alternative to 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// WebView::maxTextSizeMultiplier. 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)CONTENT_EXPORT extern const double kMaximumZoomFactor; 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Epsilon value for comparing two floating-point zoom values. We don't use 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// std::numeric_limits<> because it is too precise for zoom values. Zoom 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// values lose precision due to factor/level conversions. A value of 0.001 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// is precise enough for zoom value comparisons. 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)CONTENT_EXPORT extern const double kEpsilon; 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Test if two zoom values (either zoom factors or zoom levels) should be 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// considered equal. 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)CONTENT_EXPORT bool ZoomValuesEqual(double value_a, double value_b); 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3858e6fbe4ee35d65e14b626c557d37565bf8ad179Ben Murdoch// Converts between zoom factors and levels. 3958e6fbe4ee35d65e14b626c557d37565bf8ad179Ben MurdochCONTENT_EXPORT double ZoomLevelToZoomFactor(double zoom_level); 4058e6fbe4ee35d65e14b626c557d37565bf8ad179Ben MurdochCONTENT_EXPORT double ZoomFactorToZoomLevel(double factor); 4158e6fbe4ee35d65e14b626c557d37565bf8ad179Ben Murdoch 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace content 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif // CONTENT_PUBLIC_COMMON_PAGE_ZOOM_H_ 45